reorg dir structure, add docker image build

cfg/config.go

@@ -0,0 +1,110 @@
+/*
+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 cfg
+
+import (
+	"fmt"
+	"regexp"
+	"strings"
+	"time"
+)
+
+const Version string = "v0.0.1"
+
+var VERSION string // maintained by -x
+
+type Apicontext struct {
+	Context string `koanf:"context"` // aka name or tenant
+	Key     string `koanf:"key"`
+}
+
+// holds the whole configs, filled by commandline flags, env and config file
+type Config struct {
+	ApiPrefix  string `koanf:"apiprefix"` // path prefix
+	Debug      bool   `koanf:"debug"`
+	Listen     string `koanf:"listen"`     // [host]:port
+	StorageDir string `koanf:"storagedir"` // db and uploads go there
+	Url        string `koanf:"url"`        // public visible url, might be different from Listen
+	DbFile     string `koanf:"dbfile"`
+	Super      string `koanf:"super"` // the apicontext which has all permissions
+
+	// fiber settings, see:
+	// https://docs.gofiber.io/api/fiber/#config
+	Prefork   bool   `koanf:"prefork"`   // default: nope
+	AppName   string `koanf:"appname"`   // "upd"
+	BodyLimit int    `koanf:"bodylimit"` // much
+	V4only    bool   `koanf:"ipv4"`
+	V6only    bool   `koanf:"ipv6"`
+	Network   string
+
+	// only settable via config
+	Apicontext []Apicontext `koanf:"apicontext"`
+
+	// Internals only
+	RegNormalizedFilename *regexp.Regexp
+	RegDuration           *regexp.Regexp
+	RegKey                *regexp.Regexp
+	CleanInterval         time.Duration
+	DefaultExpire         int
+}
+
+func Getversion() string {
+	// main program version
+
+	// generated  version string, used  by -v contains  cfg.Version on
+	//  main  branch,   and  cfg.Version-$branch-$lastcommit-$date  on
+	// development branch
+
+	return fmt.Sprintf("This is upd version %s", VERSION)
+}
+
+func (c *Config) GetVersion() string {
+	return VERSION
+}
+
+// post processing of options, if any
+func (c *Config) ApplyDefaults() {
+	if len(c.Url) == 0 {
+		if strings.HasPrefix(c.Listen, ":") {
+			c.Url = "http://localhost" + c.Listen
+		} else {
+			c.Url = "http://" + c.Listen
+		}
+	}
+
+	switch {
+	case c.V4only && c.V6only:
+		c.Network = "tcp" // dual stack
+	case c.V4only:
+		c.Network = "tcp4"
+	case c.V6only:
+		c.Network = "tcp6"
+	default:
+		if c.Prefork {
+			c.Network = "tcp4"
+		} else {
+			c.Network = "tcp" // dual stack
+		}
+	}
+
+	c.RegNormalizedFilename = regexp.MustCompile(`[^\w\d\-_\.]`)
+	c.RegDuration = regexp.MustCompile(`[^dhms0-9]`)
+	c.RegKey = regexp.MustCompile(`[^a-zA-Z0-9\-]`)
+
+	c.CleanInterval = 10 * time.Second
+	c.DefaultExpire = 30 * 86400 // 1 month
+}