ForRef#check should permit internal users to read all refs

79d24d4 Make PermissionBackend#ForRef authoritative
Introduced a regression where InternalUsers where not taken into
consideration when checking READ permission.

Bug: Issue 13786
Change-Id: I3f18507f65044ac96321c1efecf1f2688f36859f
(cherry picked from commit 23ff2cfc8f)

java/com/google/gerrit/server/permissions/RefControl.java

@@ -608,6 +608,10 @@ class RefControl {
     private boolean can(RefPermission perm) throws PermissionBackendException {
       switch (perm) {
         case READ:
+          /* Internal users such as plugin users should be able to read all refs. */
+          if (getUser().isInternalUser()) {
+            return true;
+          }
           if (refName.startsWith(Constants.R_TAGS)) {
             return isTagVisible();
           }

javatests/com/google/gerrit/server/permissions/RefControlTest.java

@@ -48,6 +48,7 @@ import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.reviewdb.client.Project;
 import com.google.gerrit.reviewdb.server.ReviewDb;
 import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.InternalUser;
 import com.google.gerrit.server.account.CapabilityCollection;
 import com.google.gerrit.server.account.GroupMembership;
 import com.google.gerrit.server.account.ListGroupMembership;
@@ -391,6 +392,11 @@ public class RefControlTest {
     assertAllRefsAreNotVisible(user(allUsers, DEVS));
   }
 
+  @Test
+  public void userRefIsVisibleForInternalUser() throws Exception {
+    internalUser(local).controlForRef("refs/users/default").asForRef().check(RefPermission.READ);
+  }
+
   @Test
   public void branchDelegation1() throws Exception {
     allow(local, OWNER, ADMIN, "refs/*");
@@ -1039,6 +1045,21 @@ public class RefControlTest {
     return repo;
   }
 
+  private ProjectControl internalUser(ProjectConfig local) throws Exception {
+    return new ProjectControl(
+        Collections.emptySet(),
+        Collections.emptySet(),
+        sectionSorter,
+        changeControlFactory,
+        permissionBackend,
+        refVisibilityControl,
+        repoManager,
+        refFilterFactory,
+        allUsersName,
+        new InternalUser(),
+        newProjectState(local));
+  }
+
   private ProjectControl user(ProjectConfig local, AccountGroup.UUID... memberOf) {
     return user(local, null, memberOf);
   }