feat: provide logout url for openid providers (#1340)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/1340
Co-authored-by: viehlieb <pf@pragma-shift.net>
Co-committed-by: viehlieb <pf@pragma-shift.net>

pkg/modules/auth/openid/openid.go

@@ -51,6 +51,7 @@ type Provider struct {
 	Key             string `json:"key"`
 	OriginalAuthURL string `json:"-"`
 	AuthURL         string `json:"auth_url"`
+	LogoutURL       string `json:"logout_url"`
 	ClientID        string `json:"client_id"`
 	ClientSecret    string `json:"-"`
 	openIDProvider  *oidc.Provider

pkg/modules/auth/openid/providers.go

@@ -60,6 +60,7 @@ func GetAllProviders() (providers []*Provider, err error) {
 			}
 
 			provider, err := getProviderFromMap(pi)
+
 			if err != nil {
 				if provider != nil {
 					log.Errorf("Error while getting openid provider %s: %s", provider.Name, err)
@@ -119,12 +120,18 @@ func getProviderFromMap(pi map[string]interface{}) (provider *Provider, err erro
 
 	k := getKeyFromName(name)
 
+	logoutURL, ok := pi["logouturl"].(string)
+	if !ok {
+		logoutURL = ""
+	}
+
 	provider = &Provider{
 		Name:            pi["name"].(string),
 		Key:             k,
 		AuthURL:         pi["authurl"].(string),
 		OriginalAuthURL: pi["authurl"].(string),
 		ClientSecret:    pi["clientsecret"].(string),
+		LogoutURL:       logoutURL,
 	}
 
 	cl, is := pi["clientid"].(int)
@@ -143,7 +150,6 @@ func getProviderFromMap(pi map[string]interface{}) (provider *Provider, err erro
 		ClientID:     provider.ClientID,
 		ClientSecret: provider.ClientSecret,
 		RedirectURL:  config.AuthOpenIDRedirectURL.GetString() + k,
-
 		// Discovery returns the OAuth2 endpoints.
 		Endpoint: provider.openIDProvider.Endpoint(),