slideshow-api/internal/config/config.go

package config

import (
	"os"
	"os/exec"
	"strconv"
	"strings"
	"time"

	"git.velvettear.de/velvettear/loggo"
)

var ServerAddress string
var ServerPort int
var Directory string
var ScanInterval time.Duration
var ConvertAvailable bool

// initialize the config
func Initialize() {
	loggo.SetLogLevelByName(os.Getenv("SLIDESHOW_LOGLEVEL"))
	ServerAddress = os.Getenv("SLIDESHOW_ADDRESS")
	tmpInt, _ := strconv.Atoi(os.Getenv("SLIDESHOW_PORT"))
	if tmpInt <= 0 {
		tmpInt = 3000
	}
	ServerPort = tmpInt
	Directory = os.Getenv("SLIDESHOW_DIRECTORY")
	if len(Directory) == 0 {
		tmp, error := os.UserHomeDir()
		if error != nil {
			loggo.Fatal("encountered an error getting the current user's home directory", error.Error())
		}
		Directory = tmp
	}
	stats, error := os.Stat(Directory)
	if error != nil {
		loggo.Fatal("encountered an error checking the directory '"+Directory+"'", error.Error())
	}
	if !stats.IsDir() {
		loggo.Fatal("configured directory '" + Directory + "' is not a valid directory")
	}
	tmpInt, _ = strconv.Atoi(os.Getenv("SLIDESHOW_SCANINTERVAL"))
	if tmpInt <= 0 {
		tmpInt = 60
	}
	ScanInterval = time.Duration(tmpInt) * time.Second
	checkConvertCommand()
}

// check if 'convert' is available
func checkConvertCommand() {
	cmd := exec.Command("which", "convert")
	error := cmd.Run()
	ConvertAvailable = error == nil
	if error == nil {
		return
	}
	loggo.Warning("could not find imagemagick's 'convert' command, scaling is unavailable", error.Error())
}

// check if the given string is a valid resolution
func IsValidResolution(resolution string) bool {
	if len(resolution) <= 0 {
		return false
	}
	width, height, found := strings.Cut(resolution, "x")
	if !found {
		return false
	}
	_, error := strconv.Atoi(width)
	if error != nil {
		return false
	}
	_, error = strconv.Atoi(height)
	return error == nil
}