laminelam commented on code in PR #1791:
URL: https://github.com/apache/solr/pull/1791#discussion_r1298542144


##########
solr/webapp/web/js/angular/controllers/login.js:
##########
@@ -60,92 +60,169 @@ solrAdminApp.controller('LoginController',
             var hp = AuthenticationService.decodeHashParams(hash);
             var expectedState = sessionStorage.getItem("auth.stateRandom") + 
"_" + sessionStorage.getItem("auth.location");
             sessionStorage.setItem("auth.state", "error");
-            if (hp['access_token'] && hp['token_type'] && hp['state']) {
-              // Validate state
-              if (hp['state'] !== expectedState) {
-                $scope.error = "Problem with auth callback";
-                console.log("Expected state param " + expectedState + " but 
got " + hp['state']);
-                errorText += "Invalid values in state parameter. ";
-              }
-              // Validate token type
-              if (hp['token_type'].toLowerCase() !== "bearer") {
-                console.log("Expected token_type param 'bearer', but got " + 
hp['token_type']);
-                errorText += "Invalid values in token_type parameter. ";
-              }
-              // Unpack ID token and validate nonce, get username
-              if (hp['id_token']) {
-                var idToken = hp['id_token'].split(".");
-                if (idToken.length === 3) {
-                  var payload = 
AuthenticationService.decodeJwtPart(idToken[1]);
-                  if (!payload['nonce'] || payload['nonce'] !== 
sessionStorage.getItem("auth.nonce")) {
-                    errorText += "Invalid 'nonce' value, possible attack 
detected. Please log in again. ";
-                  }
+            $scope.authData = AuthenticationService.getAuthDataHeader();
+            if (!validateState(hp['state'], expectedState)) {
+              $scope.error = "Problems with OpenID callback";
+              $scope.errorDescription = errorText;
+              $scope.http401 = "true";
+              sessionStorage.setItem("auth.state", "error");
+            }
+            else {
+              // for backward compatibility default flow to 'implicit'
+              var flow = $scope.authData ? 
$scope.authData['authorization_flow'] : "implicit";
+              console.log("Callback: authorization_flow : " +flow);
+              var isCodePKCE = flow == 'code_pkce';
+              if (isCodePKCE) {
+                // code flow with PKCE
+                console.debug("Callback. Using code flow with PKCE");
+                var code = hp['code'];
+                var tokenEndpoint = $scope.authData['tokenEndpoint'];
+                // concurrent Solr API calls will trigger 401 and erase 
session's "auth.realm" in app.js
+                // save it before it's erased
+                var authRealm = sessionStorage.getItem("auth.realm");
+
+                var data = {
+                  'grant_type': 'authorization_code',
+                  'code': code,
+                  'redirect_uri': $window.location.href.split('#')[0],
+                  'scope': "openid " + $scope.authData['scope'],
+                  'code_verifier': sessionStorage.getItem('codeVerifier'),
+                  "client_id": $scope.authData['client_id']
+                };
 
-                  if (errorText === "") {
-                    sessionStorage.setItem("auth.username", payload['sub']);
-                    sessionStorage.setItem("auth.header", "Bearer " + 
hp['access_token']);
-                    sessionStorage.removeItem("auth.statusText");
-                    sessionStorage.removeItem("auth.stateRandom");
-                    sessionStorage.removeItem("auth.wwwAuthHeader");
-                    console.log("User " + payload['sub'] + " is logged in");
-                    var redirectTo = sessionStorage.getItem("auth.location");
-                    console.log("Redirecting to stored location " + 
redirectTo);
-                    sessionStorage.setItem("auth.state", "authenticated");
-                    sessionStorage.removeItem("http401");
-                    $location.path(redirectTo).hash("");
+                console.debug(`Callback. Got code: ${code} \nCalling token 
endpoint:: ${tokenEndpoint} `);
+                AuthenticationService.getOAuthTokens(tokenEndpoint, 
data).then(function(response) {

Review Comment:
   I feel your pain as I am facing the same issue to test the code.
   I had it as a one PIR by was asked by another committer to split it to 
facilitate its review by different committers as not everybody is familiar with 
the front-end part of Solr.
   
   I think if we could merge the back-end one it would make much easier to test



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