Altair-sh
106 lines
2.4 KiB
Go
106 lines
2.4 KiB
Go
package server
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import (
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"errors"
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"fmt"
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"io/fs"
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"os"
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"path/filepath"
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"serveg/internal/log"
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"slices"
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"strings"
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"github.com/BurntSushi/toml"
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)
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type Shares []*SharedLocation
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type Config struct {
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Addr string `toml:"address"`
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MaxUpload uint64 `toml:"max_upload"`
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HtmlTitle string `toml:"html_title"`
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// sorted by Url in reverse to allow this pattern:
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// shared/private
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// shared/
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Share Shares `toml:"share"`
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}
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var confLogger = log.LoggerContext{Name: "config"}
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func defaultConfig() *Config {
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return &Config{
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Addr: "127.0.0.1:8080",
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MaxUpload: 4 * 1024 * 1024 * 1024, // 4 GB
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}
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}
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func ParseOrCreateConfig(confPath string) (*Config, error) {
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confLogger.Info("reading config file ", confPath)
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conf, err := readConfig(confPath)
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if errors.Is(err, fs.ErrNotExist) {
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confLogger.Warn("config doesn't exist, creating default")
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conf = defaultConfig()
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err = writeConfig(conf, confPath)
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}
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if err != nil {
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return nil, err
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}
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confLogger.Info("address: ", conf.Addr)
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confLogger.Info("max_upload: ", conf.MaxUpload)
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confDir := filepath.Dir(confPath)
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sharesByUrl := make(map[string]*SharedLocation, len(conf.Share))
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for _, sh := range conf.Share {
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if err = sh.normalize(confDir); err != nil {
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return nil, err
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}
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confLogger.Info(sh)
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if other, exists := sharesByUrl[sh.Url]; exists {
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return nil, fmt.Errorf("duplicate share url: %v and %v", other, sh)
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}
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sharesByUrl[sh.Url] = sh
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if err = sh.mkdir(); err != nil {
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return nil, err
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}
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}
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// reverse sort by Url
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slices.SortFunc(conf.Share, func(a, b *SharedLocation) int {
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return strings.Compare(b.Url, a.Url) // reverse
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})
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return conf, nil
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}
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func readConfig(path string) (*Config, error) {
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var config = defaultConfig()
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tomlMeta, err := toml.DecodeFile(path, config)
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if err != nil {
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return nil, err
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}
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// check if toml contains unknown keys
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if undecodedKeys := tomlMeta.Undecoded(); len(undecodedKeys) > 0 {
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return nil, fmt.Errorf("%s: unknown keys: %v", path, undecodedKeys)
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}
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return config, nil
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}
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func writeConfig(config *Config, path string) (err error) {
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f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0o644)
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if err != nil {
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return err
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}
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defer func() {
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// Close can report a failed write, so its error matters
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if closeErr := f.Close(); err == nil {
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err = closeErr
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}
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}()
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enc := toml.NewEncoder(f)
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enc.Indent = " " // 4
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return enc.Encode(config)
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}
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