Fully support voting with arbitrary labels

This is mostly TODO cleanup where we originally ignored unknown
labels without knowing for sure that would be the right long-term
approach.

The only semantic change is that a change can no longer possibly be
considered submittable from the publish comment screen if it contains
some completely undefined labels.

Change-Id: I7a722c3e7485b681a7fe9aff8e8da1413f70771e

gerrit-httpd/src/main/java/com/google/gerrit/httpd/rpc/changedetail/PatchSetPublishDetailFactory.java

@@ -121,7 +121,7 @@ final class PatchSetPublishDetailFactory extends Handler<PatchSetPublishDetail>
             PermissionRange range = rangeByName.get(lbl.label);
             if (range != null) {
               LabelType lt = control.getLabelTypes().byLabel(lbl.label);
-              if (lt == null || lt.getMax().getValue() == range.getMax()) {
+              if (lt != null && lt.getMax().getValue() == range.getMax()) {
                 canMakeOk = true;
               }
             }

gerrit-server/src/main/java/com/google/gerrit/server/change/ChangeJson.java

@@ -335,7 +335,7 @@ public class ChangeJson {
     for (Map.Entry<String, LabelInfo> e : labels.entrySet()) {
       LabelType type = labelTypes.byLabel(e.getKey());
       if (type == null) {
-        continue; // TODO: Support arbitrary labels.
+        continue;
       }
       if (standard) {
         setRecommendedAndDisliked(cd, type, e.getValue());
@@ -444,7 +444,6 @@ public class ChangeJson {
         labels.get(name).addApproval(ai);
       }
       for (PatchSetApproval psa : current.get(accountId)) {
-        // TODO Support arbitrary labels placed by a reviewer.
         LabelType lt = ctl.getLabelTypes().byLabel(psa.getLabelId());
         if (lt == null) {
           continue;
@@ -576,7 +575,7 @@ public class ChangeJson {
       for (SubmitRecord.Label r : rec.labels) {
         LabelType type = labelTypes.byLabel(r.label);
         if (type == null) {
-          continue; // TODO: Support arbitrary labels.
+          continue;
         }
         PermissionRange range = ctl.getRange(Permission.forLabel(r.label));
         for (LabelValue v : type.getValues()) {

gerrit-server/src/main/java/com/google/gerrit/server/change/PostReview.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.change;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.base.Objects;
 import com.google.common.base.Strings;
 import com.google.common.collect.Lists;
@@ -65,7 +67,8 @@ public class PostReview implements RestModifyView<RevisionResource, Input> {
      * on access controls, attempting to use a label not granted to the user
      * will fail the entire modify operation early. If false the operation will
      * execute anyway, but the proposed labels given by the user will be
-     * modified to be the "best" value allowed by the access controls.
+     * modified to be the "best" value allowed by the access controls, or
+     * ignored if the label does not exist.
      */
     public boolean strictLabels = true;
 
@@ -173,7 +176,6 @@ public class PostReview implements RestModifyView<RevisionResource, Input> {
     while (itr.hasNext()) {
       Map.Entry<String, Short> ent = itr.next();
 
-      // TODO Support more generic label assignments.
       LabelType lt = revision.getControl().getLabelTypes()
           .byLabel(ent.getKey());
       if (lt == null) {
@@ -339,9 +341,8 @@ public class PostReview implements RestModifyView<RevisionResource, Input> {
 
     LabelTypes labelTypes = rsrc.getControl().getLabelTypes();
     for (Map.Entry<String, Short> ent : labels.entrySet()) {
-      // TODO Support arbitrary label names.
-      LabelType lt = labelTypes.byLabel(ent.getKey());
-      String name = lt.getName();
+      String name = ent.getKey();
+      LabelType lt = checkNotNull(labelTypes.byLabel(name), name);
       if (change.getStatus().isClosed()) {
         // TODO Allow updating some labels even when closed.
         continue;

gerrit-server/src/main/java/com/google/gerrit/server/change/ReviewerJson.java

@@ -92,10 +92,10 @@ public class ReviewerJson {
     for (PatchSetApproval ca : approvals) {
       for (PermissionRange pr : ctl.getLabelRanges()) {
         if (!pr.isEmpty()) {
-          // TODO: Support arbitrary labels.
           LabelType at = labelTypes.byLabel(ca.getLabelId());
           if (at != null) {
-            out.approvals.put(at.getName(), formatValue(ca.getValue())); }
+            out.approvals.put(at.getName(), formatValue(ca.getValue()));
+          }
         }
       }
     }

gerrit-server/src/main/java/com/google/gerrit/server/git/MergeUtil.java

@@ -298,7 +298,6 @@ public class MergeUtil {
       } else {
         final LabelType lt = project.getLabelTypes().byLabel(a.getLabelId());
         if (lt == null) {
-          // TODO: Support arbitrary labels.
           continue;
         }
         tag = lt.getName();