Goit

// Copyright (C) 2024, Jakob Wakeling

// All rights reserved.

package goit

import (

	"encoding/json"

	"errors"

	"os"

	"path/filepath"

)

type config struct {

	DataPath    string `json:"data_path"`

	LogsPath    string `json:"logs_path"`

	RuntimePath string `json:"runtime_path"`

	HttpAddr    string `json:"http_addr"`

	HttpPort    string `json:"http_port"`

	GitPath     string `json:"git_path"`

	IpSessions  bool   `json:"ip_sessions"`

	UsesHttps   bool   `json:"uses_https"`

	IpForwarded bool   `json:"ip_forwarded"`

	CsrfSecret  string `json:"csrf_secret"`

}

func loadConfig() (config, error) {

	conf := config{

		DataPath:    dataPath(),

		LogsPath:    logsPath(),

		RuntimePath: runtimePath(),

		HttpAddr:    "",

		HttpPort:    "8080",

		GitPath:     "git",

		IpSessions:  true,

		UsesHttps:   false,

		IpForwarded: false,

		CsrfSecret:  "1234567890abcdef1234567890abcdef",

	}

	/* Load config file(s) */

	configs := []string{

		filepath.Join("/etc", "goit", "goit.conf"),

	}

	if os.Getuid() != 0 {

		configs = append(configs, filepath.Join(userConfigBase(), "goit", "goit.conf"))

	}

	for _, file := range configs {

		if data, err := os.ReadFile(file); err != nil {

			if !errors.Is(err, os.ErrNotExist) {

				return config{}, err

			}

		} else if data != nil {

			if err := json.Unmarshal(data, &conf); err != nil {

				return config{}, err

			}

		}

	}

	/* Check required config values */

	if conf.DataPath == "" {

		return config{}, errors.New("data path unset")

	}

	return conf, nil

}

func userConfigBase() string {

	if path := os.Getenv("XDG_CONFIG_HOME"); path != "" {

		return path

	}

	if path := os.Getenv("HOME"); path != "" {

		return filepath.Join(path, ".config")

	}

	return ""

}

func dataPath() string {

	if os.Getuid() == 0 {

		return "/var/lib/goit"

	}

	if path := os.Getenv("XDG_DATA_HOME"); path != "" {

		return filepath.Join(path, "goit")

	}

	if path := os.Getenv("HOME"); path != "" {

		return filepath.Join(path, ".local", "share", "goit")

	}

	return ""

}

func logsPath() string {

	if os.Getuid() == 0 {

		return "/var/log/goit"

	}

	if path := os.Getenv("XDG_STATE_HOME"); path != "" {

		return filepath.Join(path, "goit")

	}

	if path := os.Getenv("HOME"); path != "" {

		return filepath.Join(path, ".local", "state", "goit")

	}

	return ""

}

func runtimePath() string {

	if os.Getuid() == 0 {

		return "/run"

	}

	if path := os.Getenv("XDG_RUNTIME_DIR"); path != "" {

		return filepath.Join(path)

	}

	return ""

}