simplify gitlab oauth config

account.go

@@ -309,6 +309,7 @@ func viewLogin(app *App, w http.ResponseWriter, r *http.Request) error {
 		OauthSlack    bool
 		OauthWriteAs  bool
 		OauthGitlab   bool
+		GitlabHost    string
 	}{
 		pageForReq(app, r),
 		r.FormValue("to"),
@@ -318,6 +319,7 @@ func viewLogin(app *App, w http.ResponseWriter, r *http.Request) error {
 		app.Config().SlackOauth.ClientID != "",
 		app.Config().WriteAsOauth.ClientID != "",
 		app.Config().GitlabOauth.ClientID != "",
+		config.OrDefaultString(app.Config().GitlabOauth.DisplayName, gitlabDisplayName),
 	}
 
 	if earlyError != "" {

config/config.go

@@ -72,9 +72,8 @@ type (
 	GitlabOauthCfg struct {
 		ClientID         string `ini:"client_id"`
 		ClientSecret     string `ini:"client_secret"`
-		AuthLocation     string `ini:"auth_location"`
+		Host             string `ini:"host"`
-		TokenLocation    string `ini:"token_location"`
+		DisplayName      string `ini:"display_name"`
-		InspectLocation  string `ini:"inspect_location"`
 		CallbackProxy    string `ini:"callback_proxy"`
 		CallbackProxyAPI string `ini:"callback_proxy_api"`
 	}

oauth.go

@@ -179,12 +179,13 @@ func configureGitlabOauth(parentHandler *Handler, r *mux.Router, app *App) {
 			callbackLocation = app.Config().GitlabOauth.CallbackProxy
 		}
 
+        address := config.OrDefaultString(app.Config().GitlabOauth.Host, gitlabHost)
 		oauthClient := gitlabOauthClient{
 			ClientID:         app.Config().GitlabOauth.ClientID,
 			ClientSecret:     app.Config().GitlabOauth.ClientSecret,
-			ExchangeLocation: config.OrDefaultString(app.Config().GitlabOauth.TokenLocation, gitlabExchangeLocation),
+			ExchangeLocation: address + "/oauth/token",
-			InspectLocation:  config.OrDefaultString(app.Config().GitlabOauth.InspectLocation, gitlabIdentityLocation),
+			InspectLocation:  address + "/api/v4/user",
-			AuthLocation:     config.OrDefaultString(app.Config().GitlabOauth.AuthLocation, gitlabAuthLocation),
+			AuthLocation:     address + "/oauth/authorize",
 			HttpClient:       config.DefaultHTTPClient(),
 			CallbackLocation: callbackLocation,
 		}

oauth_gitlab.go

@@ -21,9 +21,8 @@ type gitlabOauthClient struct {
 var _ oauthClient = gitlabOauthClient{}
 
 const (
-	gitlabAuthLocation     = "https://gitlab.com/oauth/authorize"
+    gitlabHost        = "https://gitlab.com"
-	gitlabExchangeLocation = "https://gitlab.com/oauth/token"
+    gitlabDisplayName = "GitLab"
-	gitlabIdentityLocation = "https://gitlab.com/api/v4/user"
 )
 
 func (c gitlabOauthClient) GetProvider() string {

pages/login.tmpl

@@ -55,7 +55,7 @@ hr.short {
 			<a class="btn cta loginbtn" id="writeas-login" href="/oauth/write.as">Sign in with <strong>Write.as</strong></a>
 		{{ end }}
 		{{ if .OauthGitlab }}
-			<a class="btn cta loginbtn" id="gitlab-login" href="/oauth/gitlab">Sign in with <strong>GitLab</strong></a>
+			<a class="btn cta loginbtn" id="gitlab-login" href="/oauth/gitlab">Sign in with <strong>{{ .GitlabDisplayName }}</strong></a>
 		{{ end }}
 		</div>