More debug and workaround for accessing GRAPH

api/api.go

@@ -11,6 +11,7 @@ import (
 )
 
 func Request(req *http.Request) (*simplejson.Json, error) {
+    log.Printf("New request to: '%s'", req.URL)
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
 		log.Printf("%s %s %s", req.Method, req.URL, err)

oauthproxy.go

@@ -521,9 +521,14 @@ func (p *OAuthProxy) OAuthStart(rw http.ResponseWriter, req *http.Request) {
 }
 
 func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
+	log.Printf("[OAuthCallback] Starting OAuthCallback")
+
 	remoteAddr := getRemoteAddr(req)
 
+	log.Printf("[OAuthCallback] remoteAddr = %s", remoteAddr)
+
 	// finish the oauth cycle
+	log.Printf("[OAuthCallback] req.ParseForm")
 	err := req.ParseForm()
 	if err != nil {
 		p.ErrorPage(rw, 500, "Internal Error", err.Error())
@@ -532,8 +537,11 @@ func (p *OAuthProxy) OAuthCallback(rw http.ResponseWriter, req *http.Request) {
 
 	errorString := req.Form.Get("error")
 	if errorString != "" {
-		p.ErrorPage(rw, 403, "Permission Denied", errorString)
-		return
+        log.Printf("[OAuthCallback] error in parsed form (REQ) : %s", req)
+        log.Printf("[OAuthCallback] error in parsed form (REQ.Form) : %s", req.Form)
+        log.Printf("[OAuthCallback] error in parsed form (REQ.error string) : %s", errorString)
+	    p.ErrorPage(rw, 403, "Permission Denied", errorString)
+	    return
 	}
 
 	session, err := p.redeemCode(req.Host, req.Form.Get("code"))

providers/azure.go

@@ -155,21 +155,34 @@ func (p *AzureProvider) GetGroups(s *SessionState, f string) (string, error) {
 	// substring - not supported   | "https://graph.microsoft.com/v1.0/me/memberOf?$filter=substring(displayName,0,2)%20eq%20%27groupname%27"
 
 	requestUrl := "https://graph.microsoft.com/v1.0/me/memberOf?$select=displayName"
+	workaround_set := false
 
 	groups := make([]string, 0)
 
 	for {
 		req, err := http.NewRequest("GET", requestUrl, nil)
+		// err = errors.New("fake error")
 
 		if err != nil {
-			return "", err
+            return "", err
 		}
 		req.Header = getAzureHeader(s.AccessToken)
 		req.Header.Add("Content-Type", "application/json")
 
 		groupData, err := api.Request(req)
 		if err != nil {
-			return "", err
+            // If workaround already tried, just fail the execution
+            if workaround_set {
+           	    log.Printf("[GetGroups] We tried hard, but still receive error: '%s'", err)
+                return "", err
+            }
+
+		    // It might be that it is a Graph bug, try to workaround it by accessing another URL
+		    log.Printf("[GetGroups] Failed to get groups details: %s", err)
+            requestUrl = "https://graph.microsoft.com/v1.0/users/" + s.Email + "/memberOf"
+		    log.Printf("[GetGroups] Try to workaround by accessing: '%s'", requestUrl)
+            workaround_set = true
+            continue
 		}
 
 		for _, groupInfo := range groupData.Get("value").MustArray() {