added option to use proxy for oauth

internal/morningalarm.go

@@ -19,6 +19,8 @@ type MorningAlarmConfig struct {
 	PlaylistID          string `json:"wakeupContext"`
 	RedirectURL         string `json:"redirectUrl"`
 	ListenAddr          string `json:"listenAddr"`
+	OAuthProxyURL       string `json:"oauthProxyUrl"`
+	OAuthProxyAPIKey    string `json:"oauthProxyApiKey"`
 }
 
 type MorningAlarm struct {
@@ -42,7 +44,11 @@ func (ma *MorningAlarm) Start() {
 
 	ma.ro = gin.Default()
 
-	ma.setupSpotify()
+	if ma.config.OAuthProxyURL != "" {
+		ma.setupSpotifyWithProxy()
+	} else {
+		ma.setupSpotify()
+	}
 
 	ma.setupWebserver()
 

internal/spotify.go

@@ -16,6 +16,32 @@ import (
 
 const redirectURI = "/api/spotifycb"
 
+type headerTransport struct {
+	baseTransport http.RoundTripper
+	headers       map[string]string
+}
+
+func (t *headerTransport) RoundTrip(req *http.Request) (*http.Response, error) {
+	for key, value := range t.headers {
+		req.Header.Set(key, value)
+	}
+
+	return t.baseTransport.RoundTrip(req)
+}
+
+func (ma *MorningAlarm) setupSpotifyWithProxy() {
+	client := &http.Client{
+		Transport: &headerTransport{
+			baseTransport: http.DefaultTransport,
+			headers: map[string]string{
+				"X-API-KEY": ma.config.OAuthProxyAPIKey,
+			},
+		},
+	}
+
+	ma.sp = spotify.New(client, spotify.WithBaseURL(ma.config.OAuthProxyURL))
+}
+
 func (ma *MorningAlarm) setupSpotify() error {
 	auth := spotifyauth.New(
 		spotifyauth.WithRedirectURL(ma.config.RedirectURL+redirectURI),