MM-27688-OpenId Connect (#16222)

* implement openid connect

* update error strings

* handle OpenIdSetting.Secret as FAKE SETTING

* add openid to telemetry

* update config defaults, add telemetry

* fix bug with Office365

* Retrieve Office365 AuthData from IdToken

* fix linter

* add feature flag, reset defaults for config

* fix build error

* fix unit tests

* add authentication permission to Feature
Flags

* turn off feature flag

* set default button color

* set default button color only on openid

* fix for merging FeatureFlags in config

* remove feature flag

* revert config changes

* remove debug statements

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

web/oauth.go

@@ -270,7 +270,7 @@ func completeOAuth(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	uri := c.GetSiteURLHeader() + "/signup/" + service + "/complete"
 
-	body, teamId, props, err := c.App.AuthorizeOAuthUser(w, r, service, code, state, uri)
+	body, teamId, props, tokenUser, err := c.App.AuthorizeOAuthUser(w, r, service, code, state, uri)
 
 	action := ""
 	if props != nil {
@@ -288,7 +288,7 @@ func completeOAuth(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	user, err := c.App.CompleteOAuth(service, body, teamId, props)
+	user, err := c.App.CompleteOAuth(service, body, teamId, props, tokenUser)
 	if err != nil {
 		err.Translate(c.App.T)
 		mlog.Error(err.Error())

web/oauth_test.go

@@ -549,12 +549,20 @@ func closeBody(r *http.Response) {
 type MattermostTestProvider struct {
 }
 
-func (m *MattermostTestProvider) GetUserFromJson(data io.Reader) (*model.User, error) {
+func (m *MattermostTestProvider) GetUserFromJson(data io.Reader, tokenUser *model.User) (*model.User, error) {
 	user := model.UserFromJson(data)
 	user.AuthData = &user.Email
 	return user, nil
 }
 
+func (m *MattermostTestProvider) GetSSOSettings(config *model.Config, service string) (*model.SSOSettings, error) {
+	return &config.GitLabSettings, nil
+}
+
+func (m *MattermostTestProvider) GetUserFromIdToken(token string) (*model.User, error) {
+	return nil, nil
+}
+
 func GenerateTestAppName() string {
 	return "fakeoauthapp" + model.NewRandomString(10)
 }