rombert commented on code in PR #78:
URL: 
https://github.com/apache/sling-org-apache-sling-resourceresolver/pull/78#discussion_r941330770


##########
src/main/java/org/apache/sling/resourceresolver/impl/console/ResourceResolverWebConsolePlugin.java:
##########
@@ -255,19 +278,42 @@ protected void doPost(HttpServletRequest request,
         // finally redirect
         final String path = request.getContextPath() + request.getServletPath()
         + request.getPathInfo();
-        final String redirectTo;
+        String redirectTo;
         if (msg == null) {
             redirectTo = path;
         } else {
             redirectTo = path + '?' + PAR_MSG + '=' + encodeParam(msg) + '&'
                     + PAR_TEST + '=' + encodeParam(test);
+                if ( user != null && user.length() > 0 ) {
+                    redirectTo += '&' + PAR_USER + '=' + encodeParam(user);
+                }
         }
         response.sendRedirect(redirectTo);
     }
 
+    private ResourceResolver 
getImpersonatedResourceResolver(HttpServletRequest request, final String user)
+            throws LoginException {
+
+        // resolver is set by the auth.core bundle in case of successful 
authentication, so it should
+        // always be there
+        Object resolverAttribute = 
request.getAttribute(AuthenticationSupport.REQUEST_ATTRIBUTE_RESOLVER);

Review Comment:
   Looking at the Oak implementation, I see that impersonation works if either:
   - the impersonator is an admin
   - the impersonator is included in the `rep:impersonators` property of the 
impersonated user
   
   
https://github.com/apache/jackrabbit-oak/blob/a90566744551246535f65c2aefc5a44fd5275490/oak-core/src/main/java/org/apache/jackrabbit/oak/security/user/ImpersonationImpl.java#L125-L146
   
   I am not sure if either of these is possible or desireable for a service 
user. Do you see another way?



##########
src/main/java/org/apache/sling/resourceresolver/impl/console/ResourceResolverWebConsolePlugin.java:
##########
@@ -255,19 +278,42 @@ protected void doPost(HttpServletRequest request,
         // finally redirect
         final String path = request.getContextPath() + request.getServletPath()
         + request.getPathInfo();
-        final String redirectTo;
+        String redirectTo;
         if (msg == null) {
             redirectTo = path;
         } else {
             redirectTo = path + '?' + PAR_MSG + '=' + encodeParam(msg) + '&'
                     + PAR_TEST + '=' + encodeParam(test);
+                if ( user != null && user.length() > 0 ) {
+                    redirectTo += '&' + PAR_USER + '=' + encodeParam(user);
+                }
         }
         response.sendRedirect(redirectTo);
     }
 
+    private ResourceResolver 
getImpersonatedResourceResolver(HttpServletRequest request, final String user)
+            throws LoginException {
+
+        // resolver is set by the auth.core bundle in case of successful 
authentication, so it should
+        // always be there
+        Object resolverAttribute = 
request.getAttribute(AuthenticationSupport.REQUEST_ATTRIBUTE_RESOLVER);

Review Comment:
   Looking at the Oak implementation, I see that impersonation works if either:
   - the impersonator is an admin
   - the impersonator is included in the `rep:impersonators` property of the 
impersonated user
   
   
https://github.com/apache/jackrabbit-oak/blob/a90566744551246535f65c2aefc5a44fd5275490/oak-core/src/main/java/org/apache/jackrabbit/oak/security/user/ImpersonationImpl.java#L125-L146
   
   I am not sure if either of these is possible or desirable for a service 
user. Do you see another way?



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