Oauth is painful

Signed-off-by: Martyn Ranyard <m@rtyn.berlin>

internal/webserver/webserver.go

@@ -207,14 +207,22 @@ func TwitchAdminHandler(response http.ResponseWriter, request *http.Request) {
 	vars := mux.Vars(request)
 	if vars["code"] != "" {
 		response.Header().Add("Content-type", "text/plain")
-		resp, err := http.PostForm(
-			"https://id.twitch.tv/oauth2/token",
-			url.Values{
-				"client_id":     {ircBot.AppCredentials.ClientID},
-				"client_secret": {ircBot.AppCredentials.Password},
-				"code":          {vars["code"]},
-				"grant_type":    {"authorization_code"},
-				"redirect_uri":  {"https://" + ircBot.Config.ExternalUrl + "/twitchadmin"}})
+		form := url.Values{
+			"client_id":     {ircBot.AppCredentials.ClientID},
+			"client_secret": {ircBot.AppCredentials.Password},
+			"code":          {vars["code"]},
+			"grant_type":    {"authorization_code"},
+			"redirect_uri":  {"https://" + ircBot.Config.ExternalUrl + "/twitchadmin"}}
+		req, err := http.NewRequest("POST", "https://id.twitch.tv/oauth2/token", strings.NewReader(form.Encode()))
+		if err != nil {
+			response.WriteHeader(500)
+			response.Header().Add("Content-type", "text/plain")
+			fmt.Fprint(response, "ERROR: "+err.Error())
+			return
+		}
+		req.Header.Add("Client-ID", ircBot.AppCredentials.ClientID)
+		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+		resp, err := http.DefaultClient.Do(req)
 		if err != nil {
 			response.WriteHeader(500)
 			response.Header().Add("Content-type", "text/plain")