Support anonymous account queries

Change-Id: Ie2d42ccf2e0364d740d6d190f29fe7bc7fea95ca
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/query/account/AccountQueryBuilder.java

@@ -123,11 +123,14 @@ public class AccountQueryBuilder extends QueryBuilder<AccountState> {
   }
 
   @Override
-  public Predicate<AccountState> defaultField(String query)
+  public Predicate<AccountState> defaultField(String query) {
-      throws QueryParseException {
     List<Predicate<AccountState>> preds = Lists.newArrayListWithCapacity(4);
     if ("self".equalsIgnoreCase(query)) {
-      preds.add(AccountPredicates.id(self()));
+      try {
+        preds.add(AccountPredicates.id(self()));
+      } catch (QueryParseException e) {
+        // Skip.
+      }
     }
     Integer id = Ints.tryParse(query);
     if (id != null) {

gerrit-server/src/test/java/com/google/gerrit/server/query/account/AbstractQueryAccountsTest.java

@@ -29,6 +29,7 @@ import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.lifecycle.LifecycleManager;
 import com.google.gerrit.reviewdb.client.Account;
 import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.AnonymousUser;
 import com.google.gerrit.server.CurrentUser;
 import com.google.gerrit.server.IdentifiedUser;
 import com.google.gerrit.server.account.AccountCache;
@@ -82,6 +83,9 @@ public abstract class AbstractQueryAccountsTest extends GerritServerTests {
   @Inject
   protected IdentifiedUser.GenericFactory userFactory;
 
+  @Inject
+  private Provider<AnonymousUser> anonymousUser;
+
   @Inject
   protected InMemoryDatabase schemaFactory;
 
@@ -134,6 +138,20 @@ public abstract class AbstractQueryAccountsTest extends GerritServerTests {
     };
   }
 
+  protected void setAnonymous() {
+    requestContext.setContext(new RequestContext() {
+      @Override
+      public CurrentUser getUser() {
+        return anonymousUser.get();
+      }
+
+      @Override
+      public Provider<ReviewDb> getReviewDbProvider() {
+        return Providers.of(db);
+      }
+    });
+  }
+
   @After
   public void tearDownInjector() {
     if (lifecycle != null) {
@@ -325,6 +343,16 @@ public abstract class AbstractQueryAccountsTest extends GerritServerTests {
         .containsExactlyElementsIn(Arrays.asList(secondaryEmails)).inOrder();
   }
 
+  @Test
+  public void asAnonymous() throws Exception {
+    AccountInfo user1 = newAccount("user1");
+
+    setAnonymous();
+    assertQuery("9999999");
+    assertQuery("self");
+    assertQuery("username:" + user1.username, user1);
+  }
+
   protected AccountInfo newAccount(String username) throws Exception {
     return newAccountWithEmail(username, null);
   }