fix linter error

* added environment variable support
* added docker instructions
* added .env hint

.github/workflows/ci.yaml

@@ -0,0 +1,47 @@
+name: build-and-test
+on: [push, pull_request]
+jobs:
+  build:
+    strategy:
+      matrix:
+        version: [1.21]
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    name: Build
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: ${{ matrix.version }}
+      id: go
+
+    - name: checkout
+      uses: actions/checkout@v3
+
+    - name: build
+      run: go build
+
+    - name: test
+      run: make test
+
+    - name: Update coverage report
+      uses: ncruces/go-coverage-report@main
+      with:
+        report: true
+        chart: true
+        amend: true
+      if: |
+        matrix.os == 'ubuntu-latest' &&
+        github.event_name == 'push'  
+      continue-on-error: true
+  
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.21
+      - uses: actions/checkout@v3
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3

.github/workflows/pushimage.yaml

@@ -0,0 +1,28 @@
+name: build-push-image
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          registry: https://ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          push: true
+          tags: ghcr.io/tlinden/kleingebaeck:${{ github.ref_name}}

.gitignore

@@ -1,3 +1,5 @@
 test
 kleingebaeck
 releases
+t/out
+.bak

Dockerfile

@@ -0,0 +1,27 @@
+FROM golang:1.21-alpine as builder
+
+RUN apk update
+RUN apk upgrade
+RUN apk add --no-cache git make
+
+RUN git --version
+
+WORKDIR /work
+
+COPY go.mod .
+COPY . .
+RUN go mod download
+RUN make
+
+FROM alpine:latest
+LABEL maintainer="Thomas von Dein <git@daemon.de>"
+
+WORKDIR /app
+COPY --from=builder /work/kleingebaeck /app/kleingebaeck
+
+ENV KLEINGEBAECK_OUTDIR /backup
+ENV LANG C.UTF-8
+USER 1001:1001
+
+ENTRYPOINT ["/app/kleingebaeck"]
+CMD ["-h"]

Makefile

@@ -50,9 +50,10 @@ install: buildlocal
 	install -o $(UID) -g $(GID) -m 444 $(tool).1 $(PREFIX)/man/man1/
 
 clean:
-	rm -rf $(tool) coverage.out testdata
+	rm -rf $(tool) coverage.out testdata t/out
 
 test: clean
+	mkdir -p t/out
 	go test ./... $(ARGS)
 
 testfuzzy: clean
@@ -86,3 +87,6 @@ show-versions: buildlocal
 	@echo
 	@echo "### go version used for building:"
 	@grep -m 1 go go.mod
+
+lint:
+	golangci-lint run -p bugs -p unused

README.md

@@ -2,8 +2,9 @@
 
 ![Kleingebaeck Logo](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/kleingebaecklogo-small.png)
 
-[![License](https://img.shields.io/badge/license-GPL-blue.svg)](https://github.com/tlinden/kleingebaeck/blob/master/LICENSE)
 [![Go Report Card](https://goreportcard.com/badge/github.com/tlinden/kleingebaeck)](https://goreportcard.com/report/github.com/tlinden/kleingebaeck) 
+[![Actions](https://github.com/tlinden/kleingebaeck/actions/workflows/ci.yaml/badge.svg)](https://github.com/tlinden/kleingebaeck/actions)
+[![Go Coverage](https://github.com/tlinden/kleingebaeck/wiki/coverage.svg)](https://raw.githack.com/wiki/tlinden/kleingebaeck/coverage.html)
 ![GitHub License](https://img.shields.io/github/license/tlinden/kleingebaeck)
 [![GitHub release](https://img.shields.io/github/v/release/tlinden/kleingebaeck?color=%2300a719)](https://github.com/TLINDEN/kleingebaeck/releases/latest)
 
@@ -15,6 +16,38 @@ directory, each ad into its own subdirectory. The backup will contain
 a textfile `Adlisting.txt` which contains the ad contents as the
 title, body, price etc. All images will be downloaded as well.
 
+## Screenshots
+
+This is the index of my kleinanzeigen.de Account:
+
+![Index](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/kleinanzeigen-index.png)
+
+Here I download my ads on the commandline:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/kleinanzeigen-download.png)
+
+And this is the backup directory after download:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/kleinanzeigen-backup.png)
+
+Here's a directory for one ad:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/kleinanzeigen-ad.png)
+
+**The same thing under windows:**
+
+Downloading ads:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/cmd-windows.jpg)
+
+Backup directory after download:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/liste-windows.jpg)
+
+And one ad listing directory:
+
+![Download](https://github.com/TLINDEN/kleingebaeck/blob/main/.github/assets/adlisting-windows.jpg)
+
 ## Installation
 
 The   tool  doesn't   need   authentication  and   doesn't  have   any
@@ -61,17 +94,48 @@ installed - `make`.
 
 To install after building either copy the binary or execute `sudo make install`.
 
+### Using the docker image
+
+A pre-built docker  image is available, which you can  use to test the
+app without  installing it. You  need `docker-compose`. Copy  the file
+`docker-compose.yaml` to somewhere, cd to that directory and execute:
+
+```shell
+mkdir kleinanzeigen-backup
+USER_ID=$(id -u) GROUP_ID=$(id -g) OUTDIR=./kleinanzeigen-backup docker-compose run kleingebaeck -u XXX -v
+```
+
+`USER_ID` and  `GROUP_ID` needs to  be specified  so that you  are the
+owner of the created backups. The backup directory `OUTDIR` must exist
+prior to the execution, otherwise docker  will create it as root, then
+kleingebaeck will  fail. You may  also use a  `.env` file in  the same
+directory containing the variables, such as:
+
+```
+USER_ID=1000
+GROUP_ID=1000
+OUTDIR=./kleinanzeigen-backup
+```
+
+You may of course also modify the `docker-compose.yaml` to suit your needs.
+
+If you want to build the image yourself, use the supplied Dockerfile.
+
 ## Commandline options:
 
 ```
 Usage: kleingebaeck [-dvVhmoc] [<ad-listing-url>,...]
 Options:
---user,-u <uid>        Backup ads from user with uid <uid>.
---debug, -d            Enable debug output.
---verbose,-v           Enable verbose output.
---output-dir,-o <dir>  Set output dir (default: current directory)
---manual,-m            Show manual.
---config,-c <file>     Use config file <file> (default: ~/.kleingebaeck).
+-u --user    <uid>      Backup ads from user with uid <uid>.
+-d --debug              Enable debug output.
+-v --verbose            Enable verbose output.
+-o --outdir  <dir>      Set output dir (default: current directory)
+-l --limit   <num>      Limit the ads to download to <num>, default: load all.
+-c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
+   --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+-m --manual             Show manual.
+-h --help               Show usage.
+-V --version            Show program version.
 
 If one  or more <ad-listing-url>'s  are specified, only  backup those,
 otherwise backup all ads of the given user.
@@ -80,16 +144,22 @@ otherwise backup all ads of the given user.
 ## Configfile
 
 You can create a config file to save typing. By default
-`~/.kleingebaeck.hcl` is being used but you can specify one with
+`~/.kleingebaeck` is being used but you can specify one with
 `-c` as well.
 
 Format is simple:
 
 ```
 user = 1010101
-verbose = true
+loglevel = verbose
 outdir = "test"
-template = ""
+```
+
+## Environment Variables
+
+Kleingebaeck can also be configured using environment variables. Just prefix the config variables with `KLEINGEBAECK_` and put them to upper case. Eg:
+```shell
+% KLEINGEBAECK_OUTDIR=/backup kleingebaeck -v
 ```
 
 ## Usage
@@ -127,6 +197,10 @@ variable. The supplied sample config contains the default template.
 
 All images will be stored in the same directory.
 
+## Documentation
+
+You can read the documentation [online](https://github.com/TLINDEN/kleingebaeck/blob/main/kleingebaeck.pod) or locally once you have installed kleingebaeck with: `kleingebaeck --manual`.
+
 ## Kleingebäck?
 
 The name is derived from "kleinanzeigen backup": "klein" (german for
@@ -146,6 +220,34 @@ https://github.com/TLINDEN/kleingebaeck/issues.
 Please repeat the failing command with debugging enabled `-d` and
 include the output in the issue.
 
+## Related projects
+
+I could not find any projects specifically designed to backup
+kleinanzeigen.de ads, however there's a bot project which is also able
+to download ads:
+[kleinanzeigen-bot](https://github.com/Second-Hand-Friends/kleinanzeigen-bot/). However,
+be aware that kleinanzeigen.de is actively fighting bots! Look at this
+[issue](https://github.com/Second-Hand-Friends/kleinanzeigen-bot/issues/219). The
+problem with these kind of bots is, that they login into your account
+using your credentials. If the company is able to detect bot activity
+they can associate it easily with your account and **lock you
+out**. So be careful.
+
+**kleingebäck** doesn't need to login, it just accesses public
+available web pages. Kleinanzeigen.de could hardly do anything against
+it, once because it is legal. There's no difference between a browser
+and a commandline client. Both run on the clientside and it is not
+kleinanzeigen.de's decision which software one uses to access their
+pages. And second: because you can use it to download any ads, not
+just yours. So it is not really clear if the activity is associated in
+any way with the ad owner. In addition to that comes the fact that
+kleingebäck is just a backup tool. It is not intendet to be used on a
+daily basis. You cannot use it to view regular ads or maintain your
+own ads. You'll need to use the mobile app or the browser page with a
+login. So, in my point of view, the risk is very minimal.
+
+There is another Tool available named [kleinanzeigen-enhanded](https://kleinanzeigen-enhanced.de/). It is a complete Ad management system targeting primarily commercial users. You have to pay a monthly fee, perhaps there's also a free version available, but I haven't checked. The tool is implemented as a Chrome browser extension, which explains why it was possible to implement it without an API. It seems to be a nice solution for power users by the looks of it. And it includes backups.
+
 ## Copyright und License
 
 Licensed under the GNU GENERAL PUBLIC LICENSE version 3.

ad.go

@@ -0,0 +1,82 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"log/slog"
+	"strings"
+	"time"
+)
+
+type Index struct {
+	Links []string `goquery:".text-module-begin a,[href]"`
+}
+
+type Ad struct {
+	Title        string `goquery:"h1"`
+	Slug         string
+	Id           string
+	Condition    string `goquery:".addetailslist--detail--value,text"`
+	Category     string
+	CategoryTree []string `goquery:".breadcrump-link,text"`
+	Price        string   `goquery:"h2#viewad-price"`
+	Created      string   `goquery:"#viewad-extra-info,text"`
+	Text         string   `goquery:"p#viewad-description-text,html"`
+	Images       []string `goquery:".galleryimage-element img,[src]"`
+	Expire       string
+}
+
+// Used by slog to pretty print an ad
+func (ad *Ad) LogValue() slog.Value {
+	return slog.GroupValue(
+		slog.String("title", ad.Title),
+		slog.String("price", ad.Price),
+		slog.String("id", ad.Id),
+		slog.Int("imagecount", len(ad.Images)),
+		slog.Int("bodysize", len(ad.Text)),
+		slog.String("categorytree", strings.Join(ad.CategoryTree, "+")),
+		slog.String("condition", ad.Condition),
+		slog.String("created", ad.Created),
+		slog.String("expire", ad.Expire),
+	)
+}
+
+// check for  completeness.  I  erected these  fields to  be mandatory
+// (though I really don't know if  they really are). I consider images
+// and meta  optional. So,  if either  of the  checked fields  here is
+// empty we  return an  error.  All the  checked fields  are extracted
+// using goquery. However,  I think price is optional  since there are
+// ads for gifts as well.
+//
+// Note: we return true for "ad is incomplete" and false for "ad is complete"!
+func (ad *Ad) Incomplete() bool {
+	if ad.Category == "" || ad.Created == "" || ad.Text == "" {
+		return true
+	}
+
+	return false
+}
+
+func (ad *Ad) CalculateExpire() {
+	if len(ad.Created) > 0 {
+		ts, err := time.Parse("02.01.2006", ad.Created)
+		if err == nil {
+			ad.Expire = ts.AddDate(0, 2, 1).Format("02.01.2006")
+		}
+	}
+}

config.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023 Thomas von Dein
+Copyright © 2023-2024 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -17,50 +17,187 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
+	"errors"
+	"fmt"
+	"io"
 	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
 
-	"github.com/hashicorp/hcl/v2/hclsimple"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/confmap"
+	"github.com/knadh/koanf/providers/env"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/providers/posflag"
+	"github.com/knadh/koanf/v2"
+	flag "github.com/spf13/pflag"
 )
 
 const (
-	VERSION         string = "0.0.6"
+	VERSION         string = "0.2.0"
 	Baseuri         string = "https://www.kleinanzeigen.de"
 	Listuri         string = "/s-bestandsliste.html"
 	Defaultdir      string = "."
 	DefaultTemplate string = "Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\n" +
-		"Category: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n"
+		"Category: {{.Category}}\nCondition: {{.Condition}}\n" +
+		"Created: {{.Created}}\nExpire: {{.Expire}}\n\n{{.Text}}\n"
 	DefaultTemplateWin string = "Title: {{.Title}}\r\nPrice: {{.Price}}\r\nId: {{.Id}}\r\n" +
-		"Category: {{.Category}}\r\nCondition: {{.Condition}}\r\nCreated: {{.Created}}\r\n\r\n{{.Text}}\r\n"
+		"Category: {{.Category}}\r\nCondition: {{.Condition}}\r\n" +
+		"Created: {{.Created}}\r\nExpires: {{.Expire}}\r\n\r\n{{.Text}}\r\n"
 	Useragent string = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " +
 		"AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
+	DefaultAdNameTemplate string = "{{.Slug}}"
 )
 
+const Usage string = `This is kleingebaeck, the kleinanzeigen.de backup tool.
+
+Usage: kleingebaeck [-dvVhmoclu] [<ad-listing-url>,...]
+
+Options:
+-u --user    <uid>      Backup ads from user with uid <uid>.
+-d --debug              Enable debug output.
+-v --verbose            Enable verbose output.
+-o --outdir  <dir>      Set output dir (default: current directory)
+-l --limit   <num>      Limit the ads to download to <num>, default: load all.
+-c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
+   --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+-f --force              Download images even if they already exist.
+-m --manual             Show manual.
+-h --help               Show usage.
+-V --version            Show program version.
+
+If one  or more ad listing url's  are specified, only  backup those,
+otherwise backup all ads of the given user.`
+
 type Config struct {
-	Verbose  *bool   `hcl:"verbose"`
-	User     *int    `hcl:"user"`
-	Outdir   *string `hcl:"outdir"`
-	Template *string `hcl:"template"`
+	Verbose          bool   `koanf:"verbose"` // loglevel=info
+	Debug            bool   `koanf:"debug"`   // loglevel=debug
+	Showversion      bool   `koanf:"version"` // -v
+	Showhelp         bool   `koanf:"help"`    // -h
+	Showmanual       bool   `koanf:"manual"`  // -m
+	User             int    `koanf:"user"`
+	Outdir           string `koanf:"outdir"`
+	Template         string `koanf:"template"`
+	Adnametemplate   string `koanf:"adnametemplate"`
+	Loglevel         string `koanf:"loglevel"`
+	Limit            int    `koanf:"limit"`
+	IgnoreErrors     bool   `koanf:"ignoreerrors"`
+	ForceDownload    bool   `koanf:"force"`
+	Adlinks          []string
+	StatsCountAds    int
+	StatsCountImages int
 }
 
-func ParseConfigfile(file string) (*Config, error) {
-	c := Config{}
-	if path, err := os.Stat(file); !os.IsNotExist(err) {
-		if !path.IsDir() {
-			configstring, err := os.ReadFile(file)
-			if err != nil {
-				return nil, err
-			}
+func (c *Config) IncrAds() {
+	c.StatsCountAds++
+}
 
-			err = hclsimple.Decode(
-				path.Name(), configstring,
-				nil, &c,
-			)
+func (c *Config) IncrImgs(num int) {
+	c.StatsCountImages += num
+}
 
-			if err != nil {
-				return nil, err
-			}
+// load commandline flags and config file
+func InitConfig(w io.Writer) (*Config, error) {
+	var k = koanf.New(".")
+
+	// determine template based on os
+	template := DefaultTemplate
+	if runtime.GOOS == "windows" {
+		template = DefaultTemplateWin
+	}
+
+	// Load default values using the confmap provider.
+	if err := k.Load(confmap.Provider(map[string]interface{}{
+		"template":       template,
+		"outdir":         ".",
+		"loglevel":       "notice",
+		"userid":         0,
+		"adnametemplate": DefaultAdNameTemplate,
+	}, "."), nil); err != nil {
+		return nil, err
+	}
+
+	// setup custom usage
+	f := flag.NewFlagSet("config", flag.ContinueOnError)
+	f.Usage = func() {
+		fmt.Fprintln(w, Usage)
+		os.Exit(0)
+	}
+
+	// parse commandline flags
+	f.StringP("config", "c", "", "config file")
+	f.StringP("outdir", "o", "", "directory where to store ads")
+	f.IntP("user", "u", 0, "user id")
+	f.IntP("limit", "l", 0, "limit ads to be downloaded (default 0, unlimited)")
+	f.BoolP("verbose", "v", false, "be verbose")
+	f.BoolP("debug", "d", false, "enable debug log")
+	f.BoolP("version", "V", false, "show program version")
+	f.BoolP("help", "h", false, "show usage")
+	f.BoolP("manual", "m", false, "show manual")
+	f.BoolP("force", "f", false, "force")
+
+	if err := f.Parse(os.Args[1:]); err != nil {
+		return nil, err
+	}
+
+	// generate a  list of config files to try  to load, including the
+	// one provided via -c, if any
+	var configfiles []string
+	configfile, _ := f.GetString("config")
+	home, _ := os.UserHomeDir()
+	if configfile != "" {
+		configfiles = []string{configfile}
+	} else {
+		configfiles = []string{
+			"/etc/kleingebaeck.conf", "/usr/local/etc/kleingebaeck.conf", // unix variants
+			filepath.Join(home, ".config", "kleingebaeck", "config"),
+			filepath.Join(home, ".kleingebaeck"),
+			"kleingebaeck.conf",
 		}
 	}
 
-	return &c, nil
+	// Load the config file[s]
+	for _, cfgfile := range configfiles {
+		if path, err := os.Stat(cfgfile); !os.IsNotExist(err) {
+			if !path.IsDir() {
+				if err := k.Load(file.Provider(cfgfile), toml.Parser()); err != nil {
+					return nil, errors.New("error loading config file: " + err.Error())
+				}
+			}
+		}
+		// else: we ignore the file if it doesn't exists
+	}
+
+	// env overrides config file
+	if err := k.Load(env.Provider("KLEINGEBAECK_", ".", func(s string) string {
+		return strings.Replace(strings.ToLower(
+			strings.TrimPrefix(s, "KLEINGEBAECK_")), "_", ".", -1)
+	}), nil); err != nil {
+		return nil, errors.New("error loading environment: " + err.Error())
+	}
+
+	// command line overrides env
+	if err := k.Load(posflag.Provider(f, ".", k), nil); err != nil {
+		return nil, errors.New("error loading flags: " + err.Error())
+	}
+
+	// fetch values
+	conf := &Config{}
+	if err := k.Unmarshal("", &conf); err != nil {
+		return nil, errors.New("error unmarshalling: " + err.Error())
+	}
+
+	// adjust loglevel
+	switch conf.Loglevel {
+	case "verbose":
+		conf.Verbose = true
+	case "debug":
+		conf.Debug = true
+	}
+
+	// are there any args left on commandline? if so threat them as adlinks
+	conf.Adlinks = f.Args()
+
+	return conf, nil
 }

docker-compose.yaml

@@ -0,0 +1,22 @@
+version: "3.9"
+services:
+  init:
+    image: alpine:latest
+    user: "root"
+    group_add:
+      - '${GROUP_ID}'
+    volumes:
+      - ${OUTDIR}:/backup
+    command: chown -R ${USER_ID}:${USER_ID} /backup
+
+  kleingebaeck:
+    container_name: kleingebaeck
+    user: "${USER_ID}:${USER_ID}"
+    volumes:
+      - ${OUTDIR}:/backup
+    working_dir: /backup
+    build: .
+    image: kleingebaeck:latest
+    depends_on:
+      init:
+        condition: service_completed_successfully

example.conf

@@ -1,6 +1,6 @@
 #
 # kleingebaeck sample configuration file.
-# put this to ~/.kleingebaeck.hcl.
+# put this to ~/.kleingebaeck.
 #
 # Comments start with the '#' character.
 
@@ -8,12 +8,23 @@
 user = 00000000
 
 # enable verbose output (same as -v), may be true or false.
-verbose = true
+# other values: notice or debug
+loglevel = "verbose"
 
 # directory where  to store downloaded  ads. kleingebaeck will  try to
 # create it. must be a quoted string.
 outdir = "test"
 
-# template. leave empty to use the default one, which is:
-# "Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\nCategory: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n"
-template = ""
+# template for  stored adlistings.  To enable  it, remove  the comment
+# chars up until the last #"""
+#template="""
+#Title: {{.Title}}
+#Price: {{.Price}}
+#Id: {{.Id}}
+#Category: {{.Category}}
+#Condition: {{.Condition}}
+#Created: {{.Created}}
+
+#{{.Text}}
+# """
+

fetch.go

@@ -0,0 +1,75 @@
+/*
+Copyright © 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"errors"
+	"io"
+	"log/slog"
+	"net/http"
+)
+
+// convenient wrapper to fetch some web content
+type Fetcher struct {
+	Config    *Config
+	Client    *http.Client
+	Useragent string // FIXME: make configurable
+}
+
+func NewFetcher(c *Config) *Fetcher {
+	return &Fetcher{
+		Client:    &http.Client{Transport: &loggingTransport{}}, // implemented in http.go
+		Useragent: Useragent,                                    // default in config.go
+		Config:    c,
+	}
+}
+
+func (f *Fetcher) Get(uri string) (io.ReadCloser, error) {
+	req, err := http.NewRequest("GET", uri, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("User-Agent", f.Useragent)
+
+	res, err := f.Client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode != 200 {
+		return nil, errors.New("could not get page via HTTP")
+	}
+
+	return res.Body, nil
+}
+
+// fetch an image
+func (f *Fetcher) Getimage(uri string) (io.ReadCloser, error) {
+	slog.Debug("fetching ad image", "uri", uri)
+	body, err := f.Get(uri)
+	if err != nil {
+		if f.Config.IgnoreErrors {
+			slog.Info("Failed to download image, error ignored", "error", err.Error())
+			return nil, nil
+		}
+		return nil, err
+	}
+
+	return body, nil
+}

go.mod

@@ -3,19 +3,36 @@ module kleingebaeck
 go 1.21
 
 require (
-	astuart.co/goq v1.0.0 // indirect
-	github.com/PuerkitoBio/goquery v1.5.0 // indirect
-	github.com/agext/levenshtein v1.2.1 // indirect
-	github.com/andybalholm/cascadia v1.0.0 // indirect
-	github.com/apparentlymart/go-textseg/v13 v13.0.0 // indirect
-	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
-	github.com/google/go-cmp v0.3.1 // indirect
-	github.com/hashicorp/hcl/v2 v2.19.1 // indirect
-	github.com/lmittmann/tint v1.0.3 // indirect
-	github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/zclconf/go-cty v1.13.0 // indirect
-	golang.org/x/net v0.0.0-20190606173856-1492cefac77f // indirect
-	golang.org/x/text v0.11.0 // indirect
+	astuart.co/goq v1.0.0
+	github.com/jarcoal/httpmock v1.3.1
+	github.com/knadh/koanf/parsers/toml v0.1.0
+	github.com/knadh/koanf/providers/confmap v0.1.0
+	github.com/knadh/koanf/providers/env v0.1.0
+	github.com/knadh/koanf/providers/file v0.1.0
+	github.com/knadh/koanf/providers/posflag v0.1.0
+	github.com/knadh/koanf/v2 v2.0.1
+	github.com/lmittmann/tint v1.0.4
+	github.com/mattn/go-isatty v0.0.20
+	github.com/spf13/pflag v1.0.5
+	github.com/tlinden/yadu v0.1.0
+	golang.org/x/sync v0.5.0
+)
+
+require (
+	github.com/PuerkitoBio/goquery v1.5.1 // indirect
+	github.com/andybalholm/cascadia v1.1.0 // indirect
+	github.com/corona10/goimagehash v1.1.0 // indirect
+	github.com/fatih/color v1.16.0 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/knadh/koanf/maps v0.1.1 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
+	github.com/pelletier/go-toml v1.9.5 // indirect
+	golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect
+	golang.org/x/sys v0.14.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 
 )

go.sum

@@ -1,37 +1,84 @@
 astuart.co/goq v1.0.0 h1:nnYIhu/Z/j0VaX9Dp+pmh2Uh7ldEz6XfgSg+bAY5Yrw=
 astuart.co/goq v1.0.0/go.mod h1:+fokcnFrO8Pw2fj8drdStJvzoMFebJH69rw8IC21rno=
-github.com/PuerkitoBio/goquery v1.5.0 h1:uGvmFXOA73IKluu/F84Xd1tt/z07GYm8X49XKHP7EJk=
 github.com/PuerkitoBio/goquery v1.5.0/go.mod h1:qD2PgZ9lccMbQlc7eEOjaeRlFQON7xY8kdmcsrnKqMg=
-github.com/agext/levenshtein v1.2.1 h1:QmvMAjj2aEICytGiWzmxoE0x2KZvE0fvmqMOfy2tjT8=
-github.com/agext/levenshtein v1.2.1/go.mod h1:JEDfjyjHDjOF/1e4FlBE/PkbqA9OfWu2ki2W0IB5558=
-github.com/andybalholm/cascadia v1.0.0 h1:hOCXnnZ5A+3eVDX8pvgl4kofXv2ELss0bKcqRySc45o=
+github.com/PuerkitoBio/goquery v1.5.1 h1:PSPBGne8NIUWw+/7vFBV+kG2J/5MOjbzc7154OaKCSE=
+github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
 github.com/andybalholm/cascadia v1.0.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
-github.com/apparentlymart/go-textseg/v13 v13.0.0 h1:Y+KvPE1NYz0xl601PVImeQfFyEy6iT90AvPUL1NNfNw=
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-github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew1u1fNQOlOtuGxQY=
-github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
+github.com/andybalholm/cascadia v1.1.0 h1:BuuO6sSfQNFRu1LppgbD25Hr2vLYW25JvxHs5zzsLTo=
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+github.com/corona10/goimagehash v1.1.0 h1:teNMX/1e+Wn/AYSbLHX8mj+mF9r60R1kBeqE9MkoYwI=
+github.com/corona10/goimagehash v1.1.0/go.mod h1:VkvE0mLn84L4aF8vCb6mafVajEb6QYMHl2ZJLn0mOGI=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.3.1 h1:Xye71clBPdm5HgqGwUkwhbynsUJZhDbS20FvLhQ2izg=
-github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
-github.com/hashicorp/hcl/v2 v2.19.1 h1://i05Jqznmb2EXqa39Nsvyan2o5XyMowW5fnCKW5RPI=
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-github.com/lmittmann/tint v1.0.3 h1:W5PHeA2D8bBJVvabNfQD/XW9HPLZK1XoPZH0cq8NouQ=
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-github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzCv8LZP15IdmG+YdwD2luVPHITV96TkirNBM=
-github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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+golang.org/x/sys v0.14.0 h1:Vz7Qs629MkJkGyHxUlRHizWJRG2j8fbQKjELVSNhy7Q=
+golang.org/x/sys v0.14.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.11.0 h1:LAntKIrcmeSKERyiOh0XMV39LXS8IE9UL2yP7+f5ij4=
-golang.org/x/text v0.11.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

http.go

@@ -0,0 +1,129 @@
+/*
+Copyright © 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"bytes"
+	"io"
+	"log/slog"
+	"math"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+// I add an artificial "ID" to each HTTP request and the corresponding
+// respose for  debugging purposes  so that  the pair  of them  can be
+// easier associated in debug output
+var letters = []rune("ABCDEF0123456789")
+
+func getid() string {
+	b := make([]rune, 8)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}
+
+// retry after HTTP 50x errors or err!=nil
+const RetryCount = 3
+
+// used to inject debug log and implement retries
+type loggingTransport struct{}
+
+// escalating timeout, $retry^2 seconds
+func backoff(retries int) time.Duration {
+	return time.Duration(math.Pow(2, float64(retries))) * time.Second
+}
+
+// only retry in case of errors or certain non 200 HTTP codes
+func shouldRetry(err error, resp *http.Response) bool {
+	if err != nil {
+		return true
+	}
+
+	if resp.StatusCode == http.StatusBadGateway ||
+		resp.StatusCode == http.StatusServiceUnavailable ||
+		resp.StatusCode == http.StatusGatewayTimeout {
+		return true
+	}
+
+	return false
+}
+
+// Body needs to be drained, otherwise we can't reuse the http.Response
+func drainBody(resp *http.Response) {
+	if resp != nil {
+		if resp.Body != nil {
+			_, err := io.Copy(io.Discard, resp.Body)
+			if err != nil {
+				// unable to copy data? uff!
+				panic(err)
+			}
+			resp.Body.Close()
+		}
+	}
+}
+
+// the actual logging transport with retries
+func (t *loggingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	// just requred for debugging
+	id := getid()
+
+	// clone the request body, put into request on retry
+	var bodyBytes []byte
+	if req.Body != nil {
+		bodyBytes, _ = io.ReadAll(req.Body)
+		req.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))
+	}
+
+	slog.Debug("REQUEST", "id", id, "uri", req.URL, "host", req.Host)
+
+	// first try
+	resp, err := http.DefaultTransport.RoundTrip(req)
+	if err == nil {
+		slog.Debug("RESPONSE", "id", id, "status", resp.StatusCode,
+			"contentlength", resp.ContentLength)
+	}
+
+	// enter retry check and loop, if first req were successfull, leave loop immediately
+	retries := 0
+	for shouldRetry(err, resp) && retries < RetryCount {
+		time.Sleep(backoff(retries))
+
+		// consume any response to reuse the connection.
+		drainBody(resp)
+
+		// clone the request body again
+		if req.Body != nil {
+			req.Body = io.NopCloser(bytes.NewBuffer(bodyBytes))
+		}
+
+		// actual retry
+		resp, err = http.DefaultTransport.RoundTrip(req)
+
+		if err == nil {
+			slog.Debug("RESPONSE", "id", id, "status", resp.StatusCode,
+				"contentlength", resp.ContentLength, "retry", retries)
+		}
+
+		retries++
+	}
+
+	return resp, err
+}

image.go

@@ -0,0 +1,142 @@
+/*
+Copyright © 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"bytes"
+	"image/jpeg"
+	"log/slog"
+	"os"
+	"path/filepath"
+
+	"github.com/corona10/goimagehash"
+)
+
+const MaxDistance = 3
+
+type Image struct {
+	Filename string
+	Hash     *goimagehash.ImageHash
+	Data     *bytes.Buffer
+	Uri      string
+}
+
+// used for logging to avoid printing Data
+func (img *Image) LogValue() slog.Value {
+	return slog.GroupValue(
+		slog.String("filename", img.Filename),
+		slog.String("uri", img.Uri),
+		slog.String("hash", img.Hash.ToString()),
+	)
+}
+
+// holds all images of an ad
+type Cache []*goimagehash.ImageHash
+
+func NewImage(buf *bytes.Buffer, filename string, uri string) *Image {
+	img := &Image{
+		Filename: filename,
+		Uri:      uri,
+		Data:     buf,
+	}
+
+	return img
+}
+
+// Calculate diff hash of the image
+func (img *Image) CalcHash() error {
+	jpgdata, err := jpeg.Decode(img.Data)
+	if err != nil {
+		return err
+	}
+
+	hash1, err := goimagehash.DifferenceHash(jpgdata)
+	if err != nil {
+		return err
+	}
+
+	img.Hash = hash1
+
+	return nil
+}
+
+// checks if 2 images are similar enough to be considered the same
+func (img *Image) Similar(hash *goimagehash.ImageHash) bool {
+	distance, err := img.Hash.Distance(hash)
+	if err != nil {
+		slog.Debug("failed to compute diff hash distance", "error", err)
+		return false
+	}
+
+	if distance < MaxDistance {
+		slog.Debug("distance computation", "image-A", img.Hash.ToString(),
+			"image-B", hash.ToString(), "distance", distance)
+		return true
+	} else {
+		return false
+	}
+}
+
+// check current image against all known hashes.
+func (img *Image) SimilarExists(cache Cache) bool {
+	for _, otherimg := range cache {
+		if img.Similar(otherimg) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// read all  JPG images  in a  ad directory,  compute diff  hashes and
+// store the results in the slice Images
+func ReadImages(addir string, dont bool) (Cache, error) {
+	files, err := os.ReadDir(addir)
+	if err != nil {
+		return nil, err
+	}
+
+	cache := Cache{}
+
+	if dont {
+		// forced download, -f given
+		return cache, nil
+	}
+
+	for _, file := range files {
+		ext := filepath.Ext(file.Name())
+		if !file.IsDir() && (ext == ".jpg" || ext == ".jpeg" || ext == ".JPG" || ext == ".JPEG") {
+			filename := filepath.Join(addir, file.Name())
+			data, err := ReadImage(filename)
+			if err != nil {
+				return nil, err
+			}
+
+			img := NewImage(data, filename, "")
+			if err = img.CalcHash(); err != nil {
+				return nil, err
+			}
+
+			slog.Debug("Caching image from file system", "image", img, "hash", img.Hash.ToString())
+			cache = append(cache, img.Hash)
+		}
+	}
+
+	//return nil, errors.New("ende")
+	return cache, nil
+}

kleingebaeck.1

@@ -133,7 +133,7 @@
 .\" ========================================================================
 .\"
 .IX Title "KLEINGEBAECK 1"
-.TH KLEINGEBAECK 1 "2023-12-17" "1" "User Commands"
+.TH KLEINGEBAECK 1 "2024-01-22" "1" "User Commands"
 .\" For nroff, turn off justification.  Always turn off hyphenation; it makes
 .\" way too many mistakes in technical documents.
 .if n .ad l
@@ -142,16 +142,20 @@
 kleingebaeck \- kleinanzeigen.de backup tool
 .SH "SYNOPSYS"
 .IX Header "SYNOPSYS"
-.Vb 9
-\&    This is kleingebaeck, the kleinanzeigen.de backup tool.
+.Vb 10
 \&    Usage: kleingebaeck [\-dvVhmoc] [<ad\-listing\-url>,...]
 \&    Options:
-\&    \-\-user,\-u <uid>        Backup ads from user with uid <uid>.
-\&    \-\-debug, \-d            Enable debug output.
-\&    \-\-verbose,\-v           Enable verbose output.
-\&    \-\-output\-dir,\-o <dir>  Set output dir (default: current directory)
-\&    \-\-manual,\-m            Show manual.
-\&    \-\-config,\-c <file>     Use config file <file> (default: ~/.kleingebaeck).
+\&    \-u \-\-user    <uid>      Backup ads from user with uid <uid>.
+\&    \-d \-\-debug              Enable debug output.
+\&    \-v \-\-verbose            Enable verbose output.
+\&    \-o \-\-outdir  <dir>      Set output dir (default: current directory)
+\&    \-l \-\-limit   <num>      Limit the ads to download to <num>, default: load all.
+\&    \-c \-\-config  <file>     Use config file <file> (default: ~/.kleingebaeck).
+\&       \-\-ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+\&    \-f \-\-force              Download images even if they already exist.
+\&    \-m \-\-manual             Show manual.
+\&    \-h \-\-help               Show usage.
+\&    \-V \-\-version            Show program version.
 .Ve
 .SH "DESCRIPTION"
 .IX Header "DESCRIPTION"
@@ -163,27 +167,42 @@ a textfile \fBAdlisting.txt\fR which contains the ad contents such as
 title, body, price etc. All images will be downloaded as well.
 .SH "CONFIGURATION"
 .IX Header "CONFIGURATION"
-You can create a config file to save typing. By default
-\&\f(CW\*(C`~/.kleingebaeck.hcl\*(C'\fR is being used but you can specify one with
-\&\f(CW\*(C`\-c\*(C'\fR as well.
+You   can  create   a  config   file  to   save  typing.   By  default
+\&\f(CW\*(C`~/.kleingebaeck\*(C'\fR is being used but you can specify one with \f(CW\*(C`\-c\*(C'\fR as
+well.   We    use   \s-1TOML\s0   as   our    configuration   language.   See
+<https://toml.io/en/>.
 .PP
-Format is simple:
+Format is pretty simple:
 .PP
-.Vb 4
+.Vb 10
 \&    user = 1010101
-\&    verbose = true
+\&    loglevel = verbose
 \&    outdir = "test"
-\&    template = ""
+\&    template = """
+\&    Title: {{.Title}}
+\&    Price: {{.Price}}
+\&    Id: {{.Id}}
+\&    Category: {{.Category}}
+\&    Condition: {{.Condition}}
+\&    Created: {{.Created}}
+\&
+\&    {{.Text}}
+\&    """
 .Ve
 .PP
-Be carefull if you want to change the template. The default one looks like this:
+Be carefull  if you want  to change the  template.  The variable  is a
+multiline string surrounded  by three double quotes. You  can left out
+certain   fields  and   use  any   formatting  you   like.  Refer   to
+<https://pkg.go.dev/text/template>  for   details  how  to   write  a
+template.
+.PP
+If you're on  windows and want to customize the  output directory, put
+it into single  quotes to avoid the backslashes  interpreted as escape
+chars like this:
 .PP
 .Vb 1
-\&   Title: {{.Title}}\enPrice: {{.Price}}\enId: {{.Id}}\enCategory: {{.Category}}\enCondition: {{.Condition}}\enCreated: {{.Created}}\en\en{{.Text}}\en
+\&    outdir = \*(AqC:\eData\eAds\*(Aq
 .Ve
-.PP
-You can left out certain fields and use any formatting you like. Refer
-to <https://pkg.go.dev/text/template> for details how to write a template.
 .SH "SETUP"
 .IX Header "SETUP"
 To setup the tool, you need to lookup your userid on
@@ -201,6 +220,22 @@ directory. Then just execute \f(CW\*(C`kleingebaeck\*(C'\fR.
 .PP
 You can use the \fB\-v\fR option to  get verbose output or \fB\-d\fR to enable
 debugging.
+.SH "ENVIRONMENT VARIABLES"
+.IX Header "ENVIRONMENT VARIABLES"
+The following environment variables  are considered:
+.PP
+.Vb 7
+\&    KLEINGEBAECK_USER
+\&    KLEINGEBAECK_DEBUG
+\&    KLEINGEBAECK_VERBOSE
+\&    KLEINGEBAECK_OUTDIR
+\&    KLEINGEBAECK_LIMIT
+\&    KLEINGEBAECK_CONFIG
+\&    KLEINGEBAECK_IGNOREERRORS
+.Ve
+.PP
+Please  note,  that  they  take   precedence  over  config  file,  but
+commandline flags take precedence over env!
 .SH "BUGS"
 .IX Header "BUGS"
 In order to report a bug, unexpected behavior, feature requests
@@ -219,7 +254,20 @@ Also there's currently no parallelization implemented. This will
 change in the future.
 .SH "LICENSE"
 .IX Header "LICENSE"
-Licensed under the \s-1GNU GENERAL PUBLIC LICENSE\s0 version 3.
+Copyright 2023\-2024 Thomas von Dein
+.PP
+This program is free software: you can redistribute it and/or modify
+it under the terms of the \s-1GNU\s0 General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+.PP
+This program is distributed in the hope that it will be useful,
+but \s-1WITHOUT ANY WARRANTY\s0; without even the implied warranty of
+\&\s-1MERCHANTABILITY\s0 or \s-1FITNESS FOR A PARTICULAR PURPOSE.\s0  See the
+\&\s-1GNU\s0 General Public License for more details.
+.PP
+You should have received a copy of the \s-1GNU\s0 General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
 .SH "Author"
 .IX Header "Author"
 T.v.Dein <tom \s-1AT\s0 vondein \s-1DOT\s0 org>

kleingebaeck.go

@@ -5,15 +5,19 @@ NAME
     kleingebaeck - kleinanzeigen.de backup tool
 
 SYNOPSYS
-        This is kleingebaeck, the kleinanzeigen.de backup tool.
         Usage: kleingebaeck [-dvVhmoc] [<ad-listing-url>,...]
         Options:
-        --user,-u <uid>        Backup ads from user with uid <uid>.
-        --debug, -d            Enable debug output.
-        --verbose,-v           Enable verbose output.
-        --output-dir,-o <dir>  Set output dir (default: current directory)
-        --manual,-m            Show manual.
-        --config,-c <file>     Use config file <file> (default: ~/.kleingebaeck).
+        -u --user    <uid>      Backup ads from user with uid <uid>.
+        -d --debug              Enable debug output.
+        -v --verbose            Enable verbose output.
+        -o --outdir  <dir>      Set output dir (default: current directory)
+        -l --limit   <num>      Limit the ads to download to <num>, default: load all.
+        -c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
+           --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+        -f --force              Download images even if they already exist.
+        -m --manual             Show manual.
+        -h --help               Show usage.
+        -V --version            Show program version.
 
 DESCRIPTION
     This tool can be used to backup ads on the german ad page
@@ -26,24 +30,36 @@ DESCRIPTION
 
 CONFIGURATION
     You can create a config file to save typing. By default
-    "~/.kleingebaeck.hcl" is being used but you can specify one with "-c" as
-    well.
+    "~/.kleingebaeck" is being used but you can specify one with "-c" as
+    well. We use TOML as our configuration language. See
+    <https://toml.io/en/>.
 
-    Format is simple:
+    Format is pretty simple:
 
         user = 1010101
-        verbose = true
+        loglevel = verbose
         outdir = "test"
-        template = ""
+        template = """
+        Title: {{.Title}}
+        Price: {{.Price}}
+        Id: {{.Id}}
+        Category: {{.Category}}
+        Condition: {{.Condition}}
+        Created: {{.Created}}
 
-    Be carefull if you want to change the template. The default one looks
+        {{.Text}}
+        """
+
+    Be carefull if you want to change the template. The variable is a
+    multiline string surrounded by three double quotes. You can left out
+    certain fields and use any formatting you like. Refer to
+    <https://pkg.go.dev/text/template> for details how to write a template.
+
+    If you're on windows and want to customize the output directory, put it
+    into single quotes to avoid the backslashes interpreted as escape chars
     like this:
 
-       Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\nCategory: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n
-
-    You can left out certain fields and use any formatting you like. Refer
-    to <https://pkg.go.dev/text/template> for details how to write a
-    template.
+        outdir = 'C:\Data\Ads'
 
 SETUP
     To setup the tool, you need to lookup your userid on kleinanzeigen.de.
@@ -59,6 +75,20 @@ SETUP
     You can use the -v option to get verbose output or -d to enable
     debugging.
 
+ENVIRONMENT VARIABLES
+    The following environment variables are considered:
+
+        KLEINGEBAECK_USER
+        KLEINGEBAECK_DEBUG
+        KLEINGEBAECK_VERBOSE
+        KLEINGEBAECK_OUTDIR
+        KLEINGEBAECK_LIMIT
+        KLEINGEBAECK_CONFIG
+        KLEINGEBAECK_IGNOREERRORS
+
+    Please note, that they take precedence over config file, but commandline
+    flags take precedence over env!
+
 BUGS
     In order to report a bug, unexpected behavior, feature requests or to
     submit a patch, please open an issue on github:
@@ -76,7 +106,20 @@ LIMITATIONS
     in the future.
 
 LICENSE
-    Licensed under the GNU GENERAL PUBLIC LICENSE version 3.
+    Copyright 2023-2024 Thomas von Dein
+
+    This program is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    This program is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+    Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program. If not, see <http://www.gnu.org/licenses/>.
 
 Author
     T.v.Dein <tom AT vondein DOT org>

kleingebaeck.pod

@@ -4,15 +4,19 @@ kleingebaeck - kleinanzeigen.de backup tool
 
 =head1 SYNOPSYS
     
-    This is kleingebaeck, the kleinanzeigen.de backup tool.
     Usage: kleingebaeck [-dvVhmoc] [<ad-listing-url>,...]
     Options:
-    --user,-u <uid>        Backup ads from user with uid <uid>.
-    --debug, -d            Enable debug output.
-    --verbose,-v           Enable verbose output.
-    --output-dir,-o <dir>  Set output dir (default: current directory)
-    --manual,-m            Show manual.
-    --config,-c <file>     Use config file <file> (default: ~/.kleingebaeck).
+    -u --user    <uid>      Backup ads from user with uid <uid>.
+    -d --debug              Enable debug output.
+    -v --verbose            Enable verbose output.
+    -o --outdir  <dir>      Set output dir (default: current directory)
+    -l --limit   <num>      Limit the ads to download to <num>, default: load all.
+    -c --config  <file>     Use config file <file> (default: ~/.kleingebaeck).
+       --ignoreerrors       Ignore HTTP errors, may lead to incomplete ad backup.
+    -f --force              Download images even if they already exist.
+    -m --manual             Show manual.
+    -h --help               Show usage.
+    -V --version            Show program version.
 
 =head1 DESCRIPTION
 
@@ -25,23 +29,38 @@ title, body, price etc. All images will be downloaded as well.
 
 =head1 CONFIGURATION
 
-You can create a config file to save typing. By default
-C<~/.kleingebaeck.hcl> is being used but you can specify one with
-C<-c> as well.
+You   can  create   a  config   file  to   save  typing.   By  default
+C<~/.kleingebaeck> is being used but you can specify one with C<-c> as
+well.   We    use   TOML   as   our    configuration   language.   See
+L<https://toml.io/en/>.
 
-Format is simple:
+Format is pretty simple:
 
     user = 1010101
-    verbose = true
+    loglevel = verbose
     outdir = "test"
-    template = ""
+    template = """
+    Title: {{.Title}}
+    Price: {{.Price}}
+    Id: {{.Id}}
+    Category: {{.Category}}
+    Condition: {{.Condition}}
+    Created: {{.Created}}
 
-Be carefull if you want to change the template. The default one looks like this:
+    {{.Text}}
+    """
 
-   Title: {{.Title}}\nPrice: {{.Price}}\nId: {{.Id}}\nCategory: {{.Category}}\nCondition: {{.Condition}}\nCreated: {{.Created}}\n\n{{.Text}}\n
+Be carefull  if you want  to change the  template.  The variable  is a
+multiline string surrounded  by three double quotes. You  can left out
+certain   fields  and   use  any   formatting  you   like.  Refer   to
+L<https://pkg.go.dev/text/template>  for   details  how  to   write  a
+template.
 
-You can left out certain fields and use any formatting you like. Refer
-to L<https://pkg.go.dev/text/template> for details how to write a template.
+If you're on  windows and want to customize the  output directory, put
+it into single  quotes to avoid the backslashes  interpreted as escape
+chars like this:
+
+    outdir = 'C:\Data\Ads'
 
 =head1 SETUP
 
@@ -59,6 +78,23 @@ directory. Then just execute C<kleingebaeck>.
 You can use the B<-v> option to  get verbose output or B<-d> to enable
 debugging.
 
+=head1 ENVIRONMENT VARIABLES
+
+The following environment variables  are considered:
+
+    KLEINGEBAECK_USER
+    KLEINGEBAECK_DEBUG
+    KLEINGEBAECK_VERBOSE
+    KLEINGEBAECK_OUTDIR
+    KLEINGEBAECK_LIMIT
+    KLEINGEBAECK_CONFIG
+    KLEINGEBAECK_IGNOREERRORS
+
+Please  note,  that  they  take   precedence  over  config  file,  but
+commandline flags take precedence over env!
+
+
+
 =head1 BUGS
 
 In order to report a bug, unexpected behavior, feature requests
@@ -79,7 +115,20 @@ change in the future.
 
 =head1 LICENSE
 
-Licensed under the GNU GENERAL PUBLIC LICENSE version 3.
+Copyright 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see L<http://www.gnu.org/licenses/>.
 
 =head1 Author
 

main.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023 Thomas von Dein
+Copyright © 2023-2024 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -20,35 +20,22 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"log/slog"
 	"os"
-	"runtime"
 	"runtime/debug"
 
 	"github.com/lmittmann/tint"
-	flag "github.com/spf13/pflag"
+	"github.com/tlinden/yadu"
 )
 
-const Usage string = `This is kleingebaeck, the kleinanzeigen.de backup tool.
-Usage: kleingebaeck [-dvVhmoc] [<ad-listing-url>,...]
-Options:
---user,-u <uid>        Backup ads from user with uid <uid>.
---debug, -d            Enable debug output.
---verbose,-v           Enable verbose output.
---output-dir,-o <dir>  Set output dir (default: current directory)
---manual,-m            Show manual.
---config,-c <file>     Use config file <file> (default: ~/.kleingebaeck).
-
-If one  or more <ad-listing-url>'s  are specified, only  backup those,
-otherwise backup all ads of the given user.`
-
 const LevelNotice = slog.Level(2)
 
 func main() {
-	os.Exit(Main())
+	os.Exit(Main(os.Stdout))
 }
 
-func Main() int {
+func Main(w io.Writer) int {
 	logLevel := &slog.LevelVar{}
 	opts := &tint.Options{
 		Level:     logLevel,
@@ -60,44 +47,30 @@ func Main() int {
 			}
 			return a
 		},
+		NoColor: IsNoTty(),
 	}
 
 	logLevel.Set(LevelNotice)
-	var handler slog.Handler = tint.NewHandler(os.Stdout, opts)
+	handler := tint.NewHandler(w, opts)
 	logger := slog.New(handler)
 	slog.SetDefault(logger)
 
-	showversion := false
-	showhelp := false
-	showmanual := false
-	enabledebug := false
-	enableverbose := false
-	uid := 0
-	configfile := os.Getenv("HOME") + "/.kleingebaeck.hcl"
-	dir := ""
+	conf, err := InitConfig(w)
+	if err != nil {
+		return Die(err)
+	}
 
-	flag.BoolVarP(&enabledebug, "debug", "d", false, "debug mode")
-	flag.BoolVarP(&enableverbose, "verbose", "v", false, "be verbose")
-	flag.BoolVarP(&showversion, "version", "V", false, "show version")
-	flag.BoolVarP(&showhelp, "help", "h", false, "show usage")
-	flag.BoolVarP(&showmanual, "manual", "m", false, "show manual")
-	flag.IntVarP(&uid, "user", "u", uid, "user id")
-	flag.StringVarP(&dir, "output-dir", "o", dir, "where to store ads")
-	flag.StringVarP(&configfile, "config", "c", configfile, "config file")
-
-	flag.Parse()
-
-	if showversion {
-		fmt.Printf("This is kleingebaeck version %s\n", VERSION)
+	if conf.Showversion {
+		fmt.Fprintf(w, "This is kleingebaeck version %s\n", VERSION)
 		return 0
 	}
 
-	if showhelp {
-		fmt.Println(Usage)
+	if conf.Showhelp {
+		fmt.Fprintln(w, Usage)
 		return 0
 	}
 
-	if showmanual {
+	if conf.Showmanual {
 		err := man()
 		if err != nil {
 			return Die(err)
@@ -105,25 +78,21 @@ func Main() int {
 		return 0
 	}
 
-	conf, err := ParseConfigfile(configfile)
-	if err != nil {
-		return Die(err)
-	}
-
-	if enableverbose || *conf.Verbose {
+	if conf.Verbose {
 		logLevel.Set(slog.LevelInfo)
 	}
 
-	if enabledebug {
+	if conf.Debug {
 		// we're using a more verbose logger in debug mode
 		buildInfo, _ := debug.ReadBuildInfo()
-		opts := &tint.Options{
+		opts := &yadu.Options{
 			Level:     logLevel,
 			AddSource: true,
+			//NoColor:   IsNoTty(),
 		}
 
 		logLevel.Set(slog.LevelDebug)
-		var handler slog.Handler = tint.NewHandler(os.Stdout, opts)
+		handler := yadu.NewHandler(w, opts)
 		debuglogger := slog.New(handler).With(
 			slog.Group("program_info",
 				slog.Int("pid", os.Getpid()),
@@ -135,53 +104,42 @@ func Main() int {
 
 	slog.Debug("config", "conf", conf)
 
-	if len(dir) == 0 {
-		if len(*conf.Outdir) > 0 {
-			dir = *conf.Outdir
-		} else {
-			dir = Defaultdir
-		}
-	}
-
 	// prepare output dir
-	err = Mkdir(dir)
+	err = Mkdir(conf.Outdir)
 	if err != nil {
 		return Die(err)
 	}
 
-	// which template to use
-	template := DefaultTemplate
-	if runtime.GOOS == "windows" {
-		template = DefaultTemplateWin
-	}
-	if len(*conf.Template) > 0 {
-		template = *conf.Template
-	}
+	// used for all HTTP requests
+	fetch := NewFetcher(conf)
 
-	// directly backup ad listing[s]
-	if len(flag.Args()) >= 1 {
-		for _, uri := range flag.Args() {
-			err := Scrape(uri, dir, template)
+	if len(conf.Adlinks) >= 1 {
+		// directly backup ad listing[s]
+		for _, uri := range conf.Adlinks {
+			err := ScrapeAd(fetch, uri)
 			if err != nil {
 				return Die(err)
 			}
 		}
-
-		return 0
-	}
-
-	// backup all ads of the given user (via config or cmdline)
-	if uid == 0 && *conf.User > 0 {
-		uid = *conf.User
-	}
-
-	if uid > 0 {
-		err := Start(fmt.Sprintf("%d", uid), dir, template)
+	} else if conf.User > 0 {
+		// backup all ads of the given user (via config or cmdline)
+		err := ScrapeUser(fetch)
 		if err != nil {
 			return Die(err)
 		}
 	} else {
-		return Die(errors.New("invalid or no user id specified"))
+		return Die(errors.New("invalid or no user id or no ad link specified"))
+	}
+
+	if conf.StatsCountAds > 0 {
+		adstr := "ads"
+		if conf.StatsCountAds == 1 {
+			adstr = "ad"
+		}
+		fmt.Fprintf(w, "Successfully downloaded %d %s with %d images to %s.\n",
+			conf.StatsCountAds, adstr, conf.StatsCountImages, conf.Outdir)
+	} else {
+		fmt.Fprintf(w, "No ads found.")
 	}
 
 	return 0

main_test.go

@@ -0,0 +1,555 @@
+/*
+Copyright © 2023-2024 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"testing"
+	tpl "text/template"
+
+	"github.com/jarcoal/httpmock"
+)
+
+// the ad list, aka:
+// https://www.kleinanzeigen.de/s-bestandsliste.html?userId=XXXXXX
+// Note, that this HTML code is reduced to the max, so that it only
+// contains the stuff required to satisfy goquery
+const LISTTPL string = `<!DOCTYPE html>
+<html lang="de" >
+  <head>
+    <title>Ads</title>
+  </head>
+  <body>
+{{ range . }}
+     <h2 class="text-module-begin">
+        <a class="ellipsis"
+           href="/s-anzeige/{{ .Slug }}/{{ .Id }}">{{ .Title }}</a>
+     </h2>
+{{ end }}
+  </body>
+</html>
+`
+
+// an actual ad listing, aka:
+// https://www.kleinanzeigen.de/s-anzeige/ad-text-slug/1010101010
+// Note, that this HTML code is reduced to the max, so that it only
+// contains the stuff required to satisfy goquery
+const ADTPL string = `DOCTYPE html>
+<html lang="de">
+  <head>
+    <title>Ad Listing</title>
+  </head>
+  <body>
+
+    <div class="l-container-row">
+        <div id="vap-brdcrmb" class="breadcrump">
+            <a class="breadcrump-link" itemprop="url" href="/" title="Kleinanzeigen ">
+                <span itemprop="title">Kleinanzeigen </span>
+            </a>
+            <a class="breadcrump-link" itemprop="url" href="/egal">
+               <span itemprop="title">{{ .Category }}</span></a>
+            </div>
+    </div>
+
+    {{ range $image := .Images }}
+    <div class="galleryimage-element" data-ix="3">
+      <img src="{{ $image }}"/>
+    </div>
+    {{ end }}
+
+    <h1 id="viewad-title" class="boxedarticle--title" itemprop="name" data-soldlabel="Verkauft">
+      {{ .Title }}</h1>
+    <div class="boxedarticle--flex--container">
+      <h2 class="boxedarticle--price" id="viewad-price">
+        {{ .Price }}</h2>
+    </div>
+
+    <div id="viewad-extra-info" class="boxedarticle--details--full">
+      <div><i class="icon icon-small icon-calendar-gray-simple"></i><span>{{ .Created }}</span></div>
+    </div>
+
+    <div class="splitlinebox l-container-row" id="viewad-details">
+      <ul class="addetailslist">
+        <li class="addetailslist--detail">
+          Zustand<span class="addetailslist--detail--value" >
+          {{ .Condition }}</span>
+        </li>
+      </ul>
+    </div>
+
+    <div class="l-container last-paragraph-no-margin-bottom">
+      <p id="viewad-description-text" class="text-force-linebreak " itemprop="description">
+        {{ .Text }}
+      </p>
+    </div>
+  </body>
+</html>
+`
+
+const EMPTYPAGE string = `DOCTYPE html>
+<html lang="de">
+  <head></head>
+  <body></body>
+</html>
+`
+
+const (
+	EMPTYURI       string = `https://www.kleinanzeigen.de/s-anzeige/empty/1`
+	INVALID503URI  string = `https://www.kleinanzeigen.de/s-anzeige/503/1`
+	INVALIDPATHURI string = `https://www.kleinanzeigen.de/anzeige/name/1`
+	INVALID404URI  string = `https://www.kleinanzeigen.de/anzeige/name/1/foo/bar`
+	INVALIDURI     string = `https://foo.bar/weird/things`
+)
+
+var base = "kleingebaeck -c t/config-empty.conf"
+
+type Tests struct {
+	name     string
+	args     string
+	expect   string
+	exitcode int
+}
+
+var tests = []Tests{
+	{
+		name:     "version",
+		args:     base + " -V",
+		expect:   "This is",
+		exitcode: 0,
+	},
+	{
+		name:     "help",
+		args:     base + " -h",
+		expect:   "Usage:",
+		exitcode: 0,
+	},
+	{
+		name:     "debug",
+		args:     base + " -d",
+		expect:   "error: invalid or no user id or no ad link specified",
+		exitcode: 1,
+	},
+	{
+		name:     "debug-check-programinfo",
+		args:     base + " -d",
+		expect:   "pid:",
+		exitcode: 1,
+	},
+	{
+		name:     "no-args-no-user",
+		args:     base,
+		expect:   "invalid or no user id",
+		exitcode: 1,
+	},
+	{
+		name:     "download-single-ad",
+		args:     base + " -o t/out https://www.kleinanzeigen.de/s-anzeige/first-ad/1",
+		expect:   "Successfully downloaded 1 ad with 2 images to t/out",
+		exitcode: 0,
+	},
+	{
+		name:     "download-single-ad-verbose",
+		args:     base + " -o t/out https://www.kleinanzeigen.de/s-anzeige/first-ad/1 -v",
+		expect:   "wrote ad listing",
+		exitcode: 0,
+	},
+	{
+		name:     "download-single-ad-debug",
+		args:     base + " -o t/out https://www.kleinanzeigen.de/s-anzeige/first-ad/1 -d",
+		expect:   "DEBUG: extracted ad listing",
+		exitcode: 0,
+	},
+	{
+		name:     "download-all-ads",
+		args:     base + " -o t/out -u 1",
+		expect:   "Successfully downloaded 6 ads with 12 images to t/out",
+		exitcode: 0,
+	},
+	{
+		name:     "download-all-ads-using-config",
+		args:     "kleingebaeck -c t/fullconfig.conf",
+		expect:   "Successfully downloaded 6 ads with 12 images to t/out",
+		exitcode: 0,
+	},
+}
+
+var invalidtests = []Tests{
+	{
+		name:     "empty-ad",
+		args:     base + " " + EMPTYURI,
+		expect:   "could not extract ad data from page, got empty struct",
+		exitcode: 1,
+	},
+	{
+		name:     "invalid-ad",
+		args:     base + " " + INVALIDURI,
+		expect:   "invalid uri",
+		exitcode: 1,
+	},
+	{
+		name:     "invalid-path",
+		args:     base + " " + INVALIDPATHURI,
+		expect:   "could not extract ad data from page, got empty struct",
+		exitcode: 1,
+	},
+	{
+		name:     "404",
+		args:     base + " " + INVALID404URI,
+		expect:   "could not get page via HTTP",
+		exitcode: 1,
+	},
+	{
+		name:     "outdir-no-exists",
+		args:     base + " -o t/foo/bar/out https://www.kleinanzeigen.de/s-anzeige/first-ad/1 -v",
+		expect:   "Failure",
+		exitcode: 1,
+	},
+	{
+		name:     "wrong-flag",
+		args:     base + " -X",
+		expect:   "unknown shorthand flag: 'X' in -X",
+		exitcode: 1,
+	},
+	{
+		name:     "no-config",
+		args:     "kleingebaeck -c t/invalid.conf",
+		expect:   "error loading config file",
+		exitcode: 1,
+	},
+	{
+		name:     "503",
+		args:     base + " " + INVALID503URI,
+		expect:   "could not get page via HTTP",
+		exitcode: 1,
+	},
+}
+
+type AdConfig struct {
+	Title     string
+	Slug      string
+	Id        string
+	Price     string
+	Category  string
+	Condition string
+	Created   string
+	Text      string
+	Images    []string // files in ./t/
+}
+
+var adsrc = []AdConfig{
+	{
+		Title: "First Ad",
+		Id:    "1", Price: "5€",
+		Category:  "Klimbim",
+		Text:      "Thing to sale",
+		Slug:      "first-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+	{
+		Title: "Secnd Ad",
+		Id:    "2", Price: "5€",
+		Category:  "Kram",
+		Text:      "Thing to sale",
+		Slug:      "second-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+	{
+		Title:     "Third Ad",
+		Id:        "3",
+		Price:     "5€",
+		Category:  "Kuddelmuddel",
+		Text:      "Thing to sale",
+		Slug:      "third-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+	{
+		Title:     "Forth Ad",
+		Id:        "4",
+		Price:     "5€",
+		Category:  "Krempel",
+		Text:      "Thing to sale",
+		Slug:      "fourth-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+	{
+		Title:     "Fifth Ad",
+		Id:        "5",
+		Price:     "5€",
+		Category:  "Kladderadatsch",
+		Text:      "Thing to sale",
+		Slug:      "fifth-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+	{
+		Title:     "Sixth Ad",
+		Id:        "6",
+		Price:     "5€",
+		Category:  "Klunker",
+		Text:      "Thing to sale",
+		Slug:      "sixth-ad",
+		Condition: "works",
+		Created:   "Yesterday",
+		Images:    []string{"t/1.jpg", "t/2.jpg"},
+	},
+}
+
+// An  Adsource  is used  to  construct  a  httpmock responder  for  a
+// particular    url.    So,     the    code    (scrape.go)    scrapes
+// https://kleinanzeigen.de,  but  in  reality httpmock  captures  the
+// request and responds with our mock data
+type Adsource struct {
+	uri     string
+	content string
+	status  int
+}
+
+// Render a HTML template for an adlisting or an ad
+func GetTemplate(l []AdConfig, a AdConfig, htmltemplate string) string {
+	tmpl, err := tpl.New("template").Parse(htmltemplate)
+	if err != nil {
+		panic(err)
+	}
+
+	var out bytes.Buffer
+	if len(a.Id) == 0 {
+		err = tmpl.Execute(&out, l)
+	} else {
+		err = tmpl.Execute(&out, a)
+	}
+
+	if err != nil {
+		panic(err)
+	}
+
+	return out.String()
+}
+
+// Initialize the valid sources for the httpmock responder
+func InitValidSources() []Adsource {
+	// valid ad listing page 1
+	list1 := []AdConfig{
+		adsrc[0], adsrc[1], adsrc[2],
+	}
+
+	// valid ad listing page 2
+	list2 := []AdConfig{
+		adsrc[3], adsrc[4], adsrc[5],
+	}
+
+	// valid ad listing page 3, which is empty
+	list3 := []AdConfig{}
+
+	// used to signal GetTemplate() to render a listing
+	empty := AdConfig{}
+
+	// prepare urls for the listing pages
+	ads := []Adsource{
+		{
+			uri:     fmt.Sprintf("%s%s?userId=1", Baseuri, Listuri),
+			content: GetTemplate(list1, empty, LISTTPL),
+		},
+		{
+			uri:     fmt.Sprintf("%s%s?userId=1&pageNum=2", Baseuri, Listuri),
+			content: GetTemplate(list2, empty, LISTTPL),
+		},
+		{
+			uri:     fmt.Sprintf("%s%s?userId=1&pageNum=3", Baseuri, Listuri),
+			content: GetTemplate(list3, empty, LISTTPL),
+		},
+	}
+
+	// prepare urls for the ads
+	for _, ad := range adsrc {
+		ads = append(ads, Adsource{
+			uri:     fmt.Sprintf("%s/s-anzeige/%s/%s", Baseuri, ad.Slug, ad.Id),
+			content: GetTemplate(nil, ad, ADTPL),
+		})
+		//panic(GetTemplate(nil, ad, ADTPL))
+	}
+
+	return ads
+}
+
+func InitInvalidSources() []Adsource {
+	empty := AdConfig{}
+	ads := []Adsource{
+		{
+			// valid ad page but without content
+			uri:     fmt.Sprintf("%s/s-anzeige/empty/1", Baseuri),
+			content: GetTemplate(nil, empty, EMPTYPAGE),
+		},
+		{
+			// some random foreign webpage
+			uri:     INVALIDURI,
+			content: GetTemplate(nil, empty, "<html>foo</html>"),
+		},
+		{
+			// some invalid page path
+			uri:     fmt.Sprintf("%s/anzeige/name/1", Baseuri),
+			content: GetTemplate(nil, empty, "<html></html>"),
+		},
+		{
+			// some none-ad page
+			uri:     fmt.Sprintf("%s/anzeige/name/1/foo/bar", Baseuri),
+			content: GetTemplate(nil, empty, "<html>HTTP 404: /eine-anzeige/ does not exist!</html>"),
+			status:  404,
+		},
+		{
+			// valid ad page but 503
+			uri:     fmt.Sprintf("%s/s-anzeige/503/1", Baseuri),
+			content: GetTemplate(nil, empty, "<html>HTTP 503: service unavailable</html>"),
+			status:  503,
+		},
+	}
+
+	return ads
+}
+
+// load a test image from disk
+func GetImage(path string) []byte {
+	dat, err := os.ReadFile(path)
+	if err != nil {
+		panic(err)
+	}
+
+	return dat
+}
+
+// setup httpmock
+func SetIntercept(ads []Adsource) {
+	for _, ad := range ads {
+		if ad.status == 0 {
+			ad.status = 200
+		}
+
+		httpmock.RegisterResponder("GET", ad.uri,
+			httpmock.NewStringResponder(ad.status, ad.content))
+	}
+
+	// we just use 2 images, put this here
+	for _, image := range []string{"t/1.jpg", "t/2.jpg"} {
+		httpmock.RegisterResponder("GET", image,
+			httpmock.NewBytesResponder(200, GetImage(image)))
+	}
+
+}
+
+func VerifyAd(ad AdConfig) error {
+	body := ad.Title + ad.Price + ad.Id + "Kleinanzeigen => " +
+		ad.Category + ad.Condition + ad.Created
+
+	// prepare ad dir name using DefaultAdNameTemplate
+	c := Config{Adnametemplate: "{{ .Slug }}"}
+	adstruct := Ad{Slug: ad.Slug, Id: ad.Id}
+	addir, err := AdDirName(&c, &adstruct)
+	if err != nil {
+		return err
+	}
+
+	file := fmt.Sprintf("t/out/%s/Adlisting.txt", addir)
+	content, err := os.ReadFile(file)
+	if err != nil {
+		return err
+	}
+
+	if body != strings.TrimSpace(string(content)) {
+		msg := fmt.Sprintf("ad content doesn't match.\nExpect: %s\n   Got: %s\n", body, content)
+		return errors.New(msg)
+	}
+
+	return nil
+}
+
+func TestMain(t *testing.T) {
+	oldargs := os.Args
+	defer func() { os.Args = oldargs }()
+
+	httpmock.Activate()
+	defer httpmock.DeactivateAndReset()
+
+	// prepare httpmock responders
+	SetIntercept(InitValidSources())
+
+	// run commandline tests
+	for _, tt := range tests {
+		var buf bytes.Buffer
+		os.Args = strings.Split(tt.args, " ")
+
+		ret := Main(&buf)
+
+		if ret != tt.exitcode {
+			t.Errorf("%s with cmd <%s> did not exit with %d but %d",
+				tt.name, tt.args, tt.exitcode, ret)
+		}
+
+		if !strings.Contains(buf.String(), tt.expect) {
+			t.Errorf("%s with cmd <%s> output did not match.\nExpect: %s\n   Got: %s\n",
+				tt.name, tt.args, tt.expect, buf.String())
+		}
+	}
+
+	// verify if downloaded ads match
+	for _, ad := range adsrc {
+		if err := VerifyAd(ad); err != nil {
+			t.Errorf(err.Error())
+		}
+	}
+}
+
+func TestMainInvalids(t *testing.T) {
+	oldargs := os.Args
+	defer func() { os.Args = oldargs }()
+
+	httpmock.Activate()
+	defer httpmock.DeactivateAndReset()
+
+	// prepare httpmock responders
+	SetIntercept(InitInvalidSources())
+
+	// run commandline tests
+	for _, tt := range invalidtests {
+		var buf bytes.Buffer
+		os.Args = strings.Split(tt.args, " ")
+
+		ret := Main(&buf)
+
+		if ret != tt.exitcode {
+			t.Errorf("%s with cmd <%s> did not exit with %d but %d",
+				tt.name, tt.args, tt.exitcode, ret)
+		}
+
+		if !strings.Contains(buf.String(), tt.expect) {
+			t.Errorf("%s with cmd <%s> output did not match.\nExpect: %s\n   Got: %s\n",
+				tt.name, tt.args, tt.expect, buf.String())
+		}
+	}
+}

scrape.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023 Thomas von Dein
+Copyright © 2023-2024 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -18,81 +18,32 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
-	"io"
 	"log/slog"
-	"net/http"
 	"path/filepath"
 	"strings"
-	"sync"
 
 	"astuart.co/goq"
+	"golang.org/x/sync/errgroup"
 )
 
-type Index struct {
-	Links []string `goquery:".text-module-begin a,[href]"`
-}
-
-type Ad struct {
-	Title     string `goquery:"h1"`
-	Slug      string
-	Id        string
-	Condition string
-	Category  string
-	Price     string   `goquery:"h2#viewad-price"`
-	Created   string   `goquery:"#viewad-extra-info,text"`
-	Text      string   `goquery:"p#viewad-description-text,html"`
-	Images    []string `goquery:".galleryimage-element img,[src]"`
-	Meta      []string `goquery:".addetailslist--detail--value,text"`
-}
-
-func (ad *Ad) LogValue() slog.Value {
-	return slog.GroupValue(
-		slog.String("title", ad.Title),
-		slog.String("price", ad.Price),
-		slog.String("id", ad.Id),
-		slog.Int("imagecount", len(ad.Images)),
-		slog.Int("bodysize", len(ad.Text)),
-	)
-}
-
-// fetch some web page content
-func Get(uri string, client *http.Client) (io.ReadCloser, error) {
-	req, err := http.NewRequest("GET", uri, nil)
-	if err != nil {
-		return nil, err
-	}
-
-	req.Header.Set("User-Agent", Useragent)
-
-	res, err := client.Do(req)
-	if err != nil {
-		return nil, err
-	}
-
-	slog.Debug("response", "code", res.StatusCode, "status",
-		res.Status, "size", res.ContentLength)
-
-	return res.Body, nil
-}
-
 // extract links from  all ad listing pages (that  is: use pagination)
 // and scrape every page
-func Start(uid string, dir string, template string) error {
-	client := &http.Client{}
+func ScrapeUser(fetch *Fetcher) error {
 	adlinks := []string{}
 
-	baseuri := Baseuri + Listuri + "?userId=" + uid
+	baseuri := fmt.Sprintf("%s%s?userId=%d", Baseuri, Listuri, fetch.Config.User)
 	page := 1
 	uri := baseuri
 
-	slog.Info("fetching ad pages", "user", uid)
+	slog.Info("fetching ad pages", "user", fetch.Config.User)
 
 	for {
 		var index Index
 		slog.Debug("fetching page", "uri", uri)
-		body, err := Get(uri, client)
+		body, err := fetch.Get(uri)
 		if err != nil {
 			return err
 		}
@@ -118,32 +69,35 @@ func Start(uid string, dir string, template string) error {
 		uri = baseuri + "&pageNum=" + fmt.Sprintf("%d", page)
 	}
 
-	for _, adlink := range adlinks {
-		err := Scrape(Baseuri+adlink, dir, template)
+	for i, adlink := range adlinks {
+		err := ScrapeAd(fetch, Baseuri+adlink)
 		if err != nil {
 			return err
 		}
+
+		if fetch.Config.Limit > 0 && i == fetch.Config.Limit-1 {
+			break
+		}
 	}
 
 	return nil
 }
 
 // scrape an ad. uri is the full uri of the ad, dir is the basedir
-func Scrape(uri string, dir string, template string) error {
-	client := &http.Client{}
+func ScrapeAd(fetch *Fetcher, uri string) error {
 	ad := &Ad{}
 
 	// extract slug and id from uri
 	uriparts := strings.Split(uri, "/")
 	if len(uriparts) < 6 {
-		return errors.New("invalid uri")
+		return errors.New("invalid uri: " + uri)
 	}
 	ad.Slug = uriparts[4]
 	ad.Id = uriparts[5]
 
 	// get the ad
 	slog.Debug("fetching ad page", "uri", uri)
-	body, err := Get(uri, client)
+	body, err := fetch.Get(uri)
 	if err != nil {
 		return err
 	}
@@ -154,70 +108,90 @@ func Scrape(uri string, dir string, template string) error {
 	if err != nil {
 		return err
 	}
-	if len(ad.Meta) == 2 {
-		ad.Category = ad.Meta[0]
-		ad.Condition = ad.Meta[1]
+
+	if len(ad.CategoryTree) > 0 {
+		ad.Category = strings.Join(ad.CategoryTree, " => ")
 	}
-	slog.Debug("extracted ad listing", "ad", ad)
+
+	if ad.Incomplete() {
+		slog.Debug("got ad", "ad", ad)
+		return errors.New("could not extract ad data from page, got empty struct")
+	}
+
+	ad.CalculateExpire()
 
 	// write listing
-	err = WriteAd(dir, ad, template)
+	addir, err := WriteAd(fetch.Config, ad)
 	if err != nil {
 		return err
 	}
 
-	return ScrapeImages(dir, ad)
+	slog.Debug("extracted ad listing", "ad", ad)
+
+	fetch.Config.IncrAds()
+
+	return ScrapeImages(fetch, ad, addir)
 }
 
-func ScrapeImages(dir string, ad *Ad) error {
+func ScrapeImages(fetch *Fetcher, ad *Ad, addir string) error {
 	// fetch images
 	img := 1
-	var wg sync.WaitGroup
-	wg.Add(len(ad.Images))
-	failure := make(chan string)
+	adpath := filepath.Join(fetch.Config.Outdir, addir)
+
+	// scan existing images, if any
+	cache, err := ReadImages(adpath, fetch.Config.ForceDownload)
+	if err != nil {
+		return err
+	}
+
+	g := new(errgroup.Group)
 
 	for _, imguri := range ad.Images {
-		file := filepath.Join(dir, ad.Slug, fmt.Sprintf("%d.jpg", img))
-		go func() {
-			defer wg.Done()
-			err := Getimage(imguri, file)
+		imguri := imguri
+		file := filepath.Join(adpath, fmt.Sprintf("%d.jpg", img))
+		g.Go(func() error {
+			body, err := fetch.Getimage(imguri)
 			if err != nil {
-				failure <- err.Error()
-				return
+				return err
 			}
-			slog.Info("wrote ad image", "image", file)
-		}()
+
+			buf := new(bytes.Buffer)
+			_, err = buf.ReadFrom(body)
+			if err != nil {
+				return err
+			}
+
+			buf2 := buf.Bytes() // needed for image writing
+
+			image := NewImage(buf, "", imguri)
+			err = image.CalcHash()
+			if err != nil {
+				return err
+			}
+
+			if !fetch.Config.ForceDownload {
+				if image.SimilarExists(cache) {
+					slog.Debug("similar image exists, not written", "uri", image.Uri)
+					return nil
+				}
+			}
+
+			err = WriteImage(file, buf2)
+			if err != nil {
+				return err
+			}
+
+			slog.Debug("wrote image", "image", image, "size", len(buf2))
+			return nil
+		})
 		img++
 	}
 
-	close(failure)
-	wg.Wait()
-	goterr := <-failure
-
-	if goterr != "" {
-		return errors.New(goterr)
-	}
-
-	return nil
-}
-
-// fetch an image
-func Getimage(uri, fileName string) error {
-	slog.Debug("fetching ad image", "uri", uri)
-	response, err := http.Get(uri)
-	if err != nil {
-		return err
-	}
-	defer response.Body.Close()
-
-	if response.StatusCode != 200 {
-		return errors.New("received non 200 response code")
-	}
-
-	err = WriteImage(fileName, response.Body)
-	if err != nil {
+	if err := g.Wait(); err != nil {
 		return err
 	}
 
+	fetch.Config.IncrImgs(len(ad.Images))
+
 	return nil
 }

store.go

@@ -1,5 +1,5 @@
 /*
-Copyright © 2023 Thomas von Dein
+Copyright © 2023-2024 Thomas von Dein
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
@@ -18,7 +18,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package main
 
 import (
-	"io"
+	"bytes"
+	"fmt"
 	"log/slog"
 	"os"
 	"path/filepath"
@@ -27,20 +28,42 @@ import (
 	tpl "text/template"
 )
 
-func WriteAd(dir string, ad *Ad, template string) error {
-	// prepare output dir
-	dir = filepath.Join(dir, ad.Slug)
-	err := Mkdir(dir)
+func AdDirName(c *Config, ad *Ad) (string, error) {
+	tmpl, err := tpl.New("adname").Parse(c.Adnametemplate)
 	if err != nil {
-		return err
+		return "", err
+	}
+
+	buf := bytes.Buffer{}
+	err = tmpl.Execute(&buf, ad)
+	if err != nil {
+		return "", err
+	}
+
+	return buf.String(), nil
+}
+
+func WriteAd(c *Config, ad *Ad) (string, error) {
+	// prepare ad dir name
+	addir, err := AdDirName(c, ad)
+	if err != nil {
+		return "", err
+	}
+
+	// prepare output dir
+	dir := filepath.Join(c.Outdir, addir)
+	err = Mkdir(dir)
+	if err != nil {
+		return "", err
 	}
 
 	// write ad file
 	listingfile := filepath.Join(dir, "Adlisting.txt")
 	f, err := os.Create(listingfile)
 	if err != nil {
-		return err
+		return "", err
 	}
+	defer f.Close()
 
 	if runtime.GOOS == "windows" {
 		ad.Text = strings.ReplaceAll(ad.Text, "<br/>", "\r\n")
@@ -48,31 +71,61 @@ func WriteAd(dir string, ad *Ad, template string) error {
 		ad.Text = strings.ReplaceAll(ad.Text, "<br/>", "\n")
 	}
 
-	tmpl, err := tpl.New("adlisting").Parse(template)
+	tmpl, err := tpl.New("adlisting").Parse(c.Template)
 	if err != nil {
-		return err
+		return "", err
 	}
+
 	err = tmpl.Execute(f, ad)
 	if err != nil {
-		return err
+		return "", err
 	}
 
 	slog.Info("wrote ad listing", "listingfile", listingfile)
 
-	return nil
+	return addir, nil
 }
 
-func WriteImage(filename string, reader io.ReadCloser) error {
+func WriteImage(filename string, buf []byte) error {
 	file, err := os.Create(filename)
 	if err != nil {
 		return err
 	}
 	defer file.Close()
 
-	_, err = io.Copy(file, reader)
+	_, err = file.Write(buf)
+
 	if err != nil {
 		return err
 	}
 
 	return nil
 }
+
+func ReadImage(filename string) (*bytes.Buffer, error) {
+	var buf bytes.Buffer
+
+	if !fileExists(filename) {
+		return nil, fmt.Errorf("image %s does not exist", filename)
+	}
+
+	data, err := os.ReadFile(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = buf.Write(data)
+	if err != nil {
+		return nil, err
+	}
+
+	return &buf, nil
+}
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}

t/config-empty.conf

@@ -0,0 +1,6 @@
+# empty config for Main() unit tests to force unit tests NOT to use an
+# eventually existing ~/.kleingebaeck!
+template="""
+{{.Title}}{{.Price}}{{.Id}}{{.Category}}{{.Condition}}{{.Created}}
+"""
+

t/fullconfig.conf

@@ -0,0 +1,6 @@
+user = 1
+loglevel = "verbose"
+outdir = "t/out"
+template="""
+{{.Title}}{{.Price}}{{.Id}}{{.Category}}{{.Condition}}{{.Created}}
+"""

t/invalid.conf

@@ -0,0 +1 @@
+user = "

util.go

@@ -22,6 +22,9 @@ import (
 	"errors"
 	"os"
 	"os/exec"
+	"runtime"
+
+	"github.com/mattn/go-isatty"
 )
 
 func Mkdir(dir string) error {
@@ -53,3 +56,13 @@ func man() error {
 
 	return nil
 }
+
+// returns TRUE if stdout is NOT a tty or windows
+func IsNoTty() bool {
+	if runtime.GOOS == "windows" || !isatty.IsTerminal(os.Stdout.Fd()) {
+		return true
+	}
+
+	// it is a tty
+	return false
+}