feat: add custom username suggestions pool (#1644)

* ✨ add custom username suggestions pool

* 🚸 add minimum of 10 suggested usernames until custom pool is used

controllers/admin/config.go

@@ -603,6 +603,27 @@ func SetForbiddenUsernameList(w http.ResponseWriter, r *http.Request) {
 	controllers.WriteSimpleResponse(w, true, "forbidden username list updated")
 }
 
+// SetSuggestedUsernameList will set the list of suggested usernames that newly registered users are assigned if it isn't inferred otherwise (i.e. through a proxy).
+func SetSuggestedUsernameList(w http.ResponseWriter, r *http.Request) {
+	type suggestedUsernameListRequest struct {
+		Value []string `json:"value"`
+	}
+
+	decoder := json.NewDecoder(r.Body)
+	var request suggestedUsernameListRequest
+
+	if err := decoder.Decode(&request); err != nil {
+		controllers.WriteSimpleResponse(w, false, "unable to update suggested usernames with provided values")
+		return
+	}
+
+	if err := data.SetSuggestedUsernamesList(request.Value); err != nil {
+		controllers.WriteSimpleResponse(w, false, err.Error())
+	}
+
+	controllers.WriteSimpleResponse(w, true, "suggested username list updated")
+}
+
 func requirePOST(w http.ResponseWriter, r *http.Request) bool {
 	if r.Method != controllers.POST {
 		controllers.WriteSimpleResponse(w, false, r.Method+" not supported")

controllers/admin/serverConfig.go

@@ -17,6 +17,7 @@ import (
 func GetServerConfig(w http.ResponseWriter, r *http.Request) {
 	ffmpeg := utils.ValidatedFfmpegPath(data.GetFfMpegPath())
 	usernameBlocklist := data.GetForbiddenUsernameList()
+	usernameSuggestions := data.GetSuggestedUsernamesList()
 
 	videoQualityVariants := make([]models.StreamOutputVariant, 0)
 	for _, variant := range data.GetStreamOutputVariants() {
@@ -64,6 +65,7 @@ func GetServerConfig(w http.ResponseWriter, r *http.Request) {
 		SupportedCodecs:    transcoder.GetCodecs(ffmpeg),
 		VideoCodec:         data.GetVideoCodec(),
 		ForbiddenUsernames: usernameBlocklist,
+		SuggestedUsernames: usernameSuggestions,
 	}
 
 	w.Header().Set("Content-Type", "application/json")
@@ -89,6 +91,7 @@ type serverConfigAdminResponse struct {
 	SupportedCodecs    []string                `json:"supportedCodecs"`
 	VideoCodec         string                  `json:"videoCodec"`
 	ForbiddenUsernames []string                `json:"forbiddenUsernames"`
+	SuggestedUsernames []string                `json:"suggestedUsernames"`
 }
 
 type videoSettings struct {