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-rw-r--r--lib/xdsconfig/fileconfig.go133
1 files changed, 133 insertions, 0 deletions
diff --git a/lib/xdsconfig/fileconfig.go b/lib/xdsconfig/fileconfig.go
new file mode 100644
index 0000000..262d023
--- /dev/null
+++ b/lib/xdsconfig/fileconfig.go
@@ -0,0 +1,133 @@
+package xdsconfig
+
+import (
+ "encoding/json"
+ "os"
+ "os/user"
+ "path"
+ "path/filepath"
+ "regexp"
+ "strings"
+)
+
+type SyncThingConf struct {
+ Home string `json:"home"`
+ GuiAddress string `json:"gui-address"`
+ GuiAPIKey string `json:"gui-apikey"`
+}
+
+type FileConfig struct {
+ WebAppDir string `json:"webAppDir"`
+ ShareRootDir string `json:"shareRootDir"`
+ HTTPPort string `json:"httpPort"`
+ SThgConf SyncThingConf `json:"syncthing"`
+}
+
+// getConfigFromFile reads configuration from a config file.
+// Order to determine which config file is used:
+// 1/ from command line option: "--config myConfig.json"
+// 2/ $HOME/.xds/config.json file
+// 3/ <xds-server executable dir>/config.json file
+
+func updateConfigFromFile(c *Config, confFile string) error {
+
+ searchIn := make([]string, 0, 3)
+ if confFile != "" {
+ searchIn = append(searchIn, confFile)
+ }
+ if usr, err := user.Current(); err == nil {
+ searchIn = append(searchIn, path.Join(usr.HomeDir, ".xds", "config.json"))
+ }
+ cwd, err := os.Getwd()
+ if err == nil {
+ searchIn = append(searchIn, path.Join(cwd, "config.json"))
+ }
+ exePath, err := filepath.Abs(filepath.Dir(os.Args[0]))
+ if err == nil {
+ searchIn = append(searchIn, path.Join(exePath, "config.json"))
+ }
+
+ var cFile *string
+ for _, p := range searchIn {
+ if _, err := os.Stat(p); err == nil {
+ cFile = &p
+ break
+ }
+ }
+ if cFile == nil {
+ // No config file found
+ return nil
+ }
+
+ // TODO move on viper package to support comments in JSON and also
+ // bind with flags (command line options)
+ // see https://github.com/spf13/viper#working-with-flags
+
+ fd, _ := os.Open(*cFile)
+ defer fd.Close()
+ fCfg := FileConfig{}
+ if err := json.NewDecoder(fd).Decode(&fCfg); err != nil {
+ return err
+ }
+ c.fileConf = fCfg
+
+ // Support environment variables (IOW ${MY_ENV_VAR} syntax) in config.json
+ // TODO: better to use reflect package to iterate on fields and be more generic
+ fCfg.WebAppDir = path.Clean(resolveEnvVar(fCfg.WebAppDir))
+ fCfg.ShareRootDir = path.Clean(resolveEnvVar(fCfg.ShareRootDir))
+ fCfg.SThgConf.Home = path.Clean(resolveEnvVar(fCfg.SThgConf.Home))
+
+ // Config file settings overwrite default config
+
+ if fCfg.WebAppDir != "" {
+ c.WebAppDir = strings.Trim(fCfg.WebAppDir, " ")
+ }
+ // Is it a full path ?
+ if !strings.HasPrefix(c.WebAppDir, "/") && exePath != "" {
+ // Check first from current directory
+ for _, rootD := range []string{cwd, exePath} {
+ ff := path.Join(rootD, c.WebAppDir, "index.html")
+ if exists(ff) {
+ c.WebAppDir = path.Join(rootD, c.WebAppDir)
+ break
+ }
+ }
+ }
+
+ if fCfg.ShareRootDir != "" {
+ c.ShareRootDir = fCfg.ShareRootDir
+ }
+
+ if fCfg.HTTPPort != "" {
+ c.HTTPPort = fCfg.HTTPPort
+ }
+
+ return nil
+}
+
+// resolveEnvVar Resolved environment variable regarding the syntax ${MYVAR}
+func resolveEnvVar(s string) string {
+ re := regexp.MustCompile("\\${(.*)}")
+ vars := re.FindAllStringSubmatch(s, -1)
+ res := s
+ for _, v := range vars {
+ val := os.Getenv(v[1])
+ if val != "" {
+ rer := regexp.MustCompile("\\${" + v[1] + "}")
+ res = rer.ReplaceAllString(res, val)
+ }
+ }
+ return res
+}
+
+// exists returns whether the given file or directory exists or not
+func exists(path string) bool {
+ _, err := os.Stat(path)
+ if err == nil {
+ return true
+ }
+ if os.IsNotExist(err) {
+ return false
+ }
+ return true
+}