Open Source Monorail

appengine/monorail/tracker/issuedetail.py

Index: appengine/monorail/tracker/issuedetail.py
diff --git a/appengine/monorail/tracker/issuedetail.py b/appengine/monorail/tracker/issuedetail.py
new file mode 100644
index 0000000000000000000000000000000000000000..4dc860187c881ae10d12c2b248f57eea5e5ef7c3
--- /dev/null
+++ b/appengine/monorail/tracker/issuedetail.py
@@ -0,0 +1,1253 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is govered by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Classes that implement the issue detail page and related forms.
+
+Summary of classes:
+  IssueDetail: Show one issue in detail w/ all metadata and comments, and
+               process additional comments or metadata changes on it.
+  SetStarForm: Record the user's desire to star or unstar an issue.
+  FlagSpamForm: Record the user's desire to report the issue as spam.
+"""
+
+import httplib
+import logging
+import time
+from third_party import ezt
+
+import settings
+from features import notify
+from framework import actionlimit
+from framework import framework_bizobj
+from framework import framework_constants
+from framework import framework_helpers
+from framework import framework_views
+from framework import jsonfeed
+from framework import monorailrequest
+from framework import paginate
+from framework import permissions
+from framework import servlet
+from framework import servlet_helpers
+from framework import sql
+from framework import template_helpers
+from framework import urls
+from framework import xsrf
+from proto import user_pb2
+from search import frontendsearchpipeline
+from services import issue_svc
+from services import tracker_fulltext
+from tracker import field_helpers
+from tracker import issuepeek
+from tracker import tracker_bizobj
+from tracker import tracker_constants
+from tracker import tracker_helpers
+from tracker import tracker_views
+
+
+class IssueDetail(issuepeek.IssuePeek):
+  """IssueDetail is a page that shows the details of one issue."""
+
+  _PAGE_TEMPLATE = 'tracker/issue-detail-page.ezt'
+  _MISSING_ISSUE_PAGE_TEMPLATE = 'tracker/issue-missing-page.ezt'
+  _MAIN_TAB_MODE = issuepeek.IssuePeek.MAIN_TAB_ISSUES
+  _CAPTCHA_ACTION_TYPES = [actionlimit.ISSUE_COMMENT]
+  _ALLOW_VIEWING_DELETED = True
+
+  def __init__(self, request, response, **kwargs):
+    super(IssueDetail, self).__init__(request, response, **kwargs)
+    self.missing_issue_template = template_helpers.MonorailTemplate(
+        self._TEMPLATE_PATH + self._MISSING_ISSUE_PAGE_TEMPLATE)
+
+  def GetTemplate(self, page_data):
+    """Return a custom 404 page for skipped issue local IDs."""
+    if page_data.get('http_response_code', httplib.OK) == httplib.NOT_FOUND:
+      return self.missing_issue_template
+    else:
+      return servlet.Servlet.GetTemplate(self, page_data)
+
+  def _GetMissingIssuePageData(
+      self, mr, issue_deleted=False, issue_missing=False,
+      issue_not_specified=False, issue_not_created=False,
+      moved_to_project_name=None, moved_to_id=None,
+      local_id=None, page_perms=None, delete_form_token=None):
+    if not page_perms:
+      # Make a default page perms.
+      page_perms = self.MakePagePerms(mr, None, granted_perms=None)
+      page_perms.CreateIssue = False
+    return {
+        'issue_tab_mode': 'issueDetail',
+        'http_response_code': httplib.NOT_FOUND,
+        'issue_deleted': ezt.boolean(issue_deleted),
+        'issue_missing': ezt.boolean(issue_missing),
+        'issue_not_specified': ezt.boolean(issue_not_specified),
+        'issue_not_created': ezt.boolean(issue_not_created),
+        'moved_to_project_name': moved_to_project_name,
+        'moved_to_id': moved_to_id,
+        'local_id': local_id,
+        'page_perms': page_perms,
+        'delete_form_token': delete_form_token,
+     }
+
+  def GatherPageData(self, mr):
+    """Build up a dictionary of data values to use when rendering the page.
+
+    Args:
+      mr: commonly used info parsed from the request.
+
+    Returns:
+      Dict of values used by EZT for rendering the page.
+    """
+    with self.profiler.Phase('getting project issue config'):
+      config = self.services.config.GetProjectConfig(mr.cnxn, mr.project_id)
+
+    # The flipper is not itself a Promise, but it contains Promises.
+    flipper = _Flipper(mr, self.services, self.profiler)
+
+    if mr.local_id is None:
+      return self._GetMissingIssuePageData(mr, issue_not_specified=True)
+    with self.profiler.Phase('finishing getting issue'):
+      try:
+        issue = self._GetIssue(mr)
+      except issue_svc.NoSuchIssueException:
+        issue = None
+
+    # Show explanation of skipped issue local IDs or deleted issues.
+    if issue is None or issue.deleted:
+      missing = mr.local_id <= self.services.issue.GetHighestLocalID(
+          mr.cnxn, mr.project_id)
+      if missing or (issue and issue.deleted):
+        moved_to_ref = self.services.issue.GetCurrentLocationOfMovedIssue(
+            mr.cnxn, mr.project_id, mr.local_id)
+        moved_to_project_id, moved_to_id = moved_to_ref
+        if moved_to_project_id is not None:
+          moved_to_project = self.services.project.GetProject(
+              mr.cnxn, moved_to_project_id)
+          moved_to_project_name = moved_to_project.project_name
+        else:
+          moved_to_project_name = None
+
+        if issue:
+          granted_perms = tracker_bizobj.GetGrantedPerms(
+              issue, mr.auth.effective_ids, config)
+        else:
+          granted_perms = None
+        page_perms = self.MakePagePerms(
+            mr, issue,
+            permissions.DELETE_ISSUE, permissions.CREATE_ISSUE,
+            granted_perms=granted_perms)
+        return self._GetMissingIssuePageData(
+            mr,
+            issue_deleted=ezt.boolean(issue is not None),
+            issue_missing=ezt.boolean(issue is None and missing),
+            moved_to_project_name=moved_to_project_name,
+            moved_to_id=moved_to_id,
+            local_id=mr.local_id,
+            page_perms=page_perms,
+            delete_form_token=xsrf.GenerateToken(
+                mr.auth.user_id, '/p/%s%s.do' % (
+                    mr.project_name, urls.ISSUE_DELETE_JSON)))
+      else:
+        # Issue is not "missing," moved, or deleted, it is just non-existent.
+        return self._GetMissingIssuePageData(mr, issue_not_created=True)
+
+    star_cnxn = sql.MonorailConnection()
+    star_promise = framework_helpers.Promise(
+        self.services.issue_star.IsItemStarredBy, star_cnxn,
+        issue.issue_id, mr.auth.user_id)
+
+    granted_perms = tracker_bizobj.GetGrantedPerms(
+        issue, mr.auth.effective_ids, config)
+
+    page_perms = self.MakePagePerms(
+        mr, issue,
+        permissions.CREATE_ISSUE,
+        permissions.FLAG_SPAM,
+        permissions.VERDICT_SPAM,
+        permissions.SET_STAR,
+        permissions.EDIT_ISSUE,
+        permissions.EDIT_ISSUE_SUMMARY,
+        permissions.EDIT_ISSUE_STATUS,
+        permissions.EDIT_ISSUE_OWNER,
+        permissions.EDIT_ISSUE_CC,
+        permissions.DELETE_ISSUE,
+        permissions.ADD_ISSUE_COMMENT,
+        permissions.DELETE_OWN,
+        permissions.DELETE_ANY,
+        permissions.VIEW_INBOUND_MESSAGES,
+        granted_perms=granted_perms)
+
+    spam_promise = None
+    spam_hist_promise = None
+
+    if page_perms.FlagSpam:
+      spam_cnxn = sql.MonorailConnection()
+      spam_promise = framework_helpers.Promise(
+          self.services.spam.LookupFlaggers, spam_cnxn,
+          issue.issue_id)
+
+    if page_perms.VerdictSpam:
+      spam_hist_cnxn = sql.MonorailConnection()
+      spam_hist_promise = framework_helpers.Promise(
+          self.services.spam.LookUpIssueVerdictHistory, spam_hist_cnxn,
+          [issue.issue_id])
+
+    with self.profiler.Phase('finishing getting comments and pagination'):
+      (description, visible_comments,
+       cmnt_pagination) = self._PaginatePartialComments(mr, issue)
+
+    with self.profiler.Phase('making user views'):
+      users_by_id = framework_views.MakeAllUserViews(
+          mr.cnxn, self.services.user,
+          tracker_bizobj.UsersInvolvedInIssues([issue]),
+          tracker_bizobj.UsersInvolvedInCommentList(
+              [description] + visible_comments))
+      framework_views.RevealAllEmailsToMembers(mr, users_by_id)
+
+    issue_flaggers, comment_flaggers = [], {}
+    if spam_promise:
+      issue_flaggers, comment_flaggers = spam_promise.WaitAndGetValue()
+
+    (issue_view, description_view,
+     comment_views) = self._MakeIssueAndCommentViews(
+         mr, issue, users_by_id, description, visible_comments, config,
+         issue_flaggers, comment_flaggers)
+
+    with self.profiler.Phase('getting starring info'):
+      starred = star_promise.WaitAndGetValue()
+      star_cnxn.Close()
+      permit_edit = permissions.CanEditIssue(
+          mr.auth.effective_ids, mr.perms, mr.project, issue,
+          granted_perms=granted_perms)
+      page_perms.EditIssue = ezt.boolean(permit_edit)
+      permit_edit_cc = self.CheckPerm(
+          mr, permissions.EDIT_ISSUE_CC, art=issue, granted_perms=granted_perms)
+      discourage_plus_one = not (starred or permit_edit or permit_edit_cc)
+
+    # Check whether to allow attachments from the details page
+    allow_attachments = tracker_helpers.IsUnderSoftAttachmentQuota(mr.project)
+    mr.ComputeColSpec(config)
+    back_to_list_url = _ComputeBackToListURL(mr, issue, config)
+    flipper.SearchForIIDs(mr, issue)
+    restrict_to_known = config.restrict_to_known
+    field_name_set = {fd.field_name.lower() for fd in config.field_defs
+                      if not fd.is_deleted}  # TODO(jrobbins): restrictions
+    non_masked_labels = tracker_bizobj.NonMaskedLabels(
+        issue.labels, field_name_set)
+
+    component_paths = []
+    for comp_id in issue.component_ids:
+      cd = tracker_bizobj.FindComponentDefByID(comp_id, config)
+      if cd:
+        component_paths.append(cd.path)
+      else:
+        logging.warn(
+            'Issue %r has unknown component %r', issue.issue_id, comp_id)
+    initial_components = ', '.join(component_paths)
+
+    after_issue_update = tracker_constants.DEFAULT_AFTER_ISSUE_UPDATE
+    if mr.auth.user_pb:
+      after_issue_update = mr.auth.user_pb.after_issue_update
+
+    prevent_restriction_removal = (
+        mr.project.only_owners_remove_restrictions and
+        not framework_bizobj.UserOwnsProject(
+            mr.project, mr.auth.effective_ids))
+
+    offer_issue_copy_move = True
+    for lab in tracker_bizobj.GetLabels(issue):
+      if lab.lower().startswith('restrict-'):
+        offer_issue_copy_move = False
+
+    previous_locations = self.GetPreviousLocations(mr, issue)
+
+    spam_verdict_history = []
+    if spam_hist_promise:
+      spam_hist = spam_hist_promise.WaitAndGetValue()
+
+      spam_verdict_history = [template_helpers.EZTItem(
+          created=verdict['created'].isoformat(),
+          is_spam=verdict['is_spam'],
+          reason=verdict['reason'],
+          user_id=verdict['user_id'],
+          classifier_confidence=verdict['classifier_confidence'],
+          overruled=verdict['overruled'],
+          ) for verdict in spam_hist]
+
+    return {
+        'issue_tab_mode': 'issueDetail',
+        'issue': issue_view,
+        'title_summary': issue_view.summary,  # used in <head><title>
+        'description': description_view,
+        'comments': comment_views,
+        'num_detail_rows': len(comment_views) + 4,
+        'noisy': ezt.boolean(tracker_helpers.IsNoisy(
+            len(comment_views), issue.star_count)),
+
+        'flipper': flipper,
+        'cmnt_pagination': cmnt_pagination,
+        'searchtip': 'You can jump to any issue by number',
+        'starred': ezt.boolean(starred),
+        'discourage_plus_one': ezt.boolean(discourage_plus_one),
+        'pagegen': str(long(time.time() * 1000000)),
+        'attachment_form_token': xsrf.GenerateToken(
+            mr.auth.user_id, '/p/%s%s.do' % (
+                mr.project_name, urls.ISSUE_ATTACHMENT_DELETION_JSON)),
+        'delComment_form_token': xsrf.GenerateToken(
+            mr.auth.user_id, '/p/%s%s.do' % (
+                mr.project_name, urls.ISSUE_COMMENT_DELETION_JSON)),
+       'delete_form_token': xsrf.GenerateToken(
+            mr.auth.user_id, '/p/%s%s.do' % (
+                mr.project_name, urls.ISSUE_DELETE_JSON)),
+        'flag_spam_token': xsrf.GenerateToken(
+            mr.auth.user_id, '/p/%s%s.do' % (
+                mr.project_name, urls.ISSUE_FLAGSPAM_JSON)),
+        'set_star_token': xsrf.GenerateToken(
+            mr.auth.user_id, '/p/%s%s.do' % (
+                mr.project_name, urls.ISSUE_SETSTAR_JSON)),
+
+
+        # For deep linking and input correction after a failed submit.
+        'initial_summary': issue_view.summary,
+        'initial_comment': '',
+        'initial_status': issue_view.status.name,
+        'initial_owner': issue_view.owner.email,
+        'initial_cc': ', '.join([pb.email for pb in issue_view.cc]),
+        'initial_blocked_on': issue_view.blocked_on_str,
+        'initial_blocking': issue_view.blocking_str,
+        'initial_merge_into': issue_view.merged_into_str,
+        'labels': non_masked_labels,
+        'initial_components': initial_components,
+        'fields': issue_view.fields,
+
+        'any_errors': ezt.boolean(mr.errors.AnyErrors()),
+        'allow_attachments': ezt.boolean(allow_attachments),
+        'max_attach_size': template_helpers.BytesKbOrMb(
+            framework_constants.MAX_POST_BODY_SIZE),
+        'colspec': mr.col_spec,
+        'back_to_list_url': back_to_list_url,
+        'restrict_to_known': ezt.boolean(restrict_to_known),
+        'after_issue_update': int(after_issue_update),  # TODO(jrobbins): str
+        'prevent_restriction_removal': ezt.boolean(
+            prevent_restriction_removal),
+        'offer_issue_copy_move': ezt.boolean(offer_issue_copy_move),
+        'statuses_offer_merge': config.statuses_offer_merge,
+        'page_perms': page_perms,
+        'previous_locations': previous_locations,
+        'spam_verdict_history': spam_verdict_history,
+    }
+
+  def GatherHelpData(self, mr, _page_data):
+    """Return a dict of values to drive on-page user help.
+
+    Args:
+      mr: commonly used info parsed from the request.
+      _page_data: Dictionary of base and page template data.
+
+    Returns:
+      A dict of values to drive on-page user help, to be added to page_data.
+    """
+    is_privileged_domain_user = framework_bizobj.IsPriviledgedDomainUser(
+        mr.auth.user_pb.email)
+    # Check if the user's query is just the ID of an existing issue.
+    # If so, display a "did you mean to search?" cue card.
+    jump_local_id = None
+    cue = None
+    if (tracker_constants.JUMP_RE.match(mr.query) and
+        mr.auth.user_pb and
+        'search_for_numbers' not in mr.auth.user_pb.dismissed_cues):
+      jump_local_id = int(mr.query)
+      cue = 'search_for_numbers'
+
+    if (mr.auth.user_id and
+        'privacy_click_through' not in mr.auth.user_pb.dismissed_cues):
+      cue = 'privacy_click_through'
+
+    return {
+        'is_privileged_domain_user': ezt.boolean(is_privileged_domain_user),
+        'jump_local_id': jump_local_id,
+        'cue': cue,
+        }
+
+  # TODO(sheyang): Support comments incremental loading in API
+  def _PaginatePartialComments(self, mr, issue):
+    """Load and paginate the visible comments for the given issue."""
+    abbr_comment_rows = self.services.issue.GetAbbrCommentsForIssue(
+          mr.cnxn, issue.issue_id)
+    if not abbr_comment_rows:
+      return None, [], None
+
+    description = abbr_comment_rows[0]
+    comments = abbr_comment_rows[1:]
+    all_comment_ids = [row[0] for row in comments]
+
+    pagination_url = '%s?id=%d' % (urls.ISSUE_DETAIL, issue.local_id)
+    pagination = paginate.VirtualPagination(
+        mr, len(all_comment_ids),
+        framework_constants.DEFAULT_COMMENTS_PER_PAGE,
+        list_page_url=pagination_url,
+        count_up=False, start_param='cstart', num_param='cnum',
+        max_num=settings.max_comments_per_page)
+    if pagination.last == 1 and pagination.start == len(all_comment_ids):
+      pagination.visible = ezt.boolean(False)
+
+    visible_comment_ids = [description[0]] + all_comment_ids[
+        pagination.last - 1:pagination.start]
+    visible_comment_seqs = [0] + range(pagination.last, pagination.start + 1)
+    visible_comments = self.services.issue.GetCommentsByID(
+          mr.cnxn, visible_comment_ids, visible_comment_seqs)
+
+    return visible_comments[0], visible_comments[1:], pagination
+
+
+  def _ValidateOwner(self, mr, post_data_owner, parsed_owner_id,
+                     original_issue_owner_id):
+    """Validates that the issue's owner was changed and is a valid owner.
+
+    Args:
+      mr: Commonly used info parsed from the request.
+      post_data_owner: The owner as specified in the request's data.
+      parsed_owner_id: The owner_id from the request.
+      original_issue_owner_id: The original owner id of the issue.
+
+    Returns:
+      String error message if the owner fails validation else returns None.
+    """
+    parsed_owner_valid, msg = tracker_helpers.IsValidIssueOwner(
+        mr.cnxn, mr.project, parsed_owner_id, self.services)
+    if not parsed_owner_valid:
+      # Only fail validation if the user actually changed the email address.
+      original_issue_owner = self.services.user.LookupUserEmail(
+          mr.cnxn, original_issue_owner_id)
+      if post_data_owner != original_issue_owner:
+        return msg
+      else:
+        # The user did not change the owner, thus do not fail validation.
+        # See https://bugs.chromium.org/p/monorail/issues/detail?id=28 for
+        # more details.
+        pass
+
+  def ProcessFormData(self, mr, post_data):
+    """Process the posted issue update form.
+
+    Args:
+      mr: commonly used info parsed from the request.
+      post_data: The post_data dict for the current request.
+
+    Returns:
+      String URL to redirect the user to after processing.
+    """
+    issue = self._GetIssue(mr)
+    if not issue:
+      logging.warn('issue not found! project_name: %r   local id: %r',
+                   mr.project_name, mr.local_id)
+      raise monorailrequest.InputException('Issue not found in project')
+
+    # Check that the user is logged in; anon users cannot update issues.
+    if not mr.auth.user_id:
+      logging.info('user was not logged in, cannot update issue')
+      raise permissions.PermissionException(
+          'User must be logged in to update an issue')
+
+    # Check that the user has permission to add a comment, and to enter
+    # metadata if they are trying to do that.
+    if not self.CheckPerm(mr, permissions.ADD_ISSUE_COMMENT,
+                          art=issue):
+      logging.info('user has no permission to add issue comment')
+      raise permissions.PermissionException(
+          'User has no permission to comment on issue')
+
+    parsed = tracker_helpers.ParseIssueRequest(
+        mr.cnxn, post_data, self.services, mr.errors, issue.project_name)
+    config = self.services.config.GetProjectConfig(mr.cnxn, mr.project_id)
+    bounce_labels = parsed.labels[:]
+    bounce_fields = tracker_views.MakeBounceFieldValueViews(
+        parsed.fields.vals, config)
+    field_helpers.ShiftEnumFieldsIntoLabels(
+        parsed.labels, parsed.labels_remove,
+        parsed.fields.vals, parsed.fields.vals_remove, config)
+    field_values = field_helpers.ParseFieldValues(
+        mr.cnxn, self.services.user, parsed.fields.vals, config)
+
+    component_ids = tracker_helpers.LookupComponentIDs(
+        parsed.components.paths, config, mr.errors)
+
+    granted_perms = tracker_bizobj.GetGrantedPerms(
+        issue, mr.auth.effective_ids, config)
+    permit_edit = permissions.CanEditIssue(
+        mr.auth.effective_ids, mr.perms, mr.project, issue,
+        granted_perms=granted_perms)
+    page_perms = self.MakePagePerms(
+        mr, issue,
+        permissions.CREATE_ISSUE,
+        permissions.EDIT_ISSUE_SUMMARY,
+        permissions.EDIT_ISSUE_STATUS,
+        permissions.EDIT_ISSUE_OWNER,
+        permissions.EDIT_ISSUE_CC,
+        granted_perms=granted_perms)
+    page_perms.EditIssue = ezt.boolean(permit_edit)
+
+    if not permit_edit:
+      if not _FieldEditPermitted(
+          parsed.labels, parsed.blocked_on.entered_str,
+          parsed.blocking.entered_str, parsed.summary,
+          parsed.status, parsed.users.owner_id,
+          parsed.users.cc_ids, page_perms):
+        raise permissions.PermissionException(
+            'User lacks permission to edit fields')
+
+    page_generation_time = long(post_data['pagegen'])
+    reporter_id = mr.auth.user_id
+    self.CheckCaptcha(mr, post_data)
+
+    error_msg = self._ValidateOwner(
+        mr, post_data.get('owner', '').strip(), parsed.users.owner_id,
+        issue.owner_id)
+    if error_msg:
+      mr.errors.owner = error_msg
+
+    if None in parsed.users.cc_ids:
+      mr.errors.cc = 'Invalid Cc username'
+
+    if len(parsed.comment) > tracker_constants.MAX_COMMENT_CHARS:
+      mr.errors.comment = 'Comment is too long'
+    if len(parsed.summary) > tracker_constants.MAX_SUMMARY_CHARS:
+      mr.errors.summary = 'Summary is too long'
+
+    old_owner_id = tracker_bizobj.GetOwnerId(issue)
+
+    orig_merged_into_iid = issue.merged_into
+    merge_into_iid = issue.merged_into
+    merge_into_text, merge_into_issue = tracker_helpers.ParseMergeFields(
+        mr.cnxn, self.services, mr.project_name, post_data,
+        parsed.status, config, issue, mr.errors)
+    if merge_into_issue:
+      merge_into_iid = merge_into_issue.issue_id
+      merge_into_project = self.services.project.GetProjectByName(
+          mr.cnxn, merge_into_issue.project_name)
+      merge_allowed = tracker_helpers.IsMergeAllowed(
+          merge_into_issue, mr, self.services)
+
+      new_starrers = tracker_helpers.GetNewIssueStarrers(
+          mr.cnxn, self.services, issue.issue_id, merge_into_iid)
+
+    # For any fields that the user does not have permission to edit, use
+    # the current values in the issue rather than whatever strings were parsed.
+    labels = parsed.labels
+    summary = parsed.summary
+    status = parsed.status
+    owner_id = parsed.users.owner_id
+    cc_ids = parsed.users.cc_ids
+    blocked_on_iids = [iid for iid in parsed.blocked_on.iids
+                       if iid != issue.issue_id]
+    blocking_iids = [iid for iid in parsed.blocking.iids
+                     if iid != issue.issue_id]
+    dangling_blocked_on_refs = [tracker_bizobj.MakeDanglingIssueRef(*ref)
+                                for ref in parsed.blocked_on.dangling_refs]
+    dangling_blocking_refs = [tracker_bizobj.MakeDanglingIssueRef(*ref)
+                              for ref in parsed.blocking.dangling_refs]
+    if not permit_edit:
+      labels = issue.labels
+      field_values = issue.field_values
+      component_ids = issue.component_ids
+      blocked_on_iids = issue.blocked_on_iids
+      blocking_iids = issue.blocking_iids
+      dangling_blocked_on_refs = issue.dangling_blocked_on_refs
+      dangling_blocking_refs = issue.dangling_blocking_refs
+      merge_into_iid = issue.merged_into
+      if not page_perms.EditIssueSummary:
+        summary = issue.summary
+      if not page_perms.EditIssueStatus:
+        status = issue.status
+      if not page_perms.EditIssueOwner:
+        owner_id = issue.owner_id
+      if not page_perms.EditIssueCc:
+        cc_ids = issue.cc_ids
+
+    field_helpers.ValidateCustomFields(
+        mr, self.services, field_values, config, mr.errors)
+
+    orig_blocked_on = issue.blocked_on_iids
+    if not mr.errors.AnyErrors():
+      try:
+        if parsed.attachments:
+          new_bytes_used = tracker_helpers.ComputeNewQuotaBytesUsed(
+              mr.project, parsed.attachments)
+          self.services.project.UpdateProject(
+              mr.cnxn, mr.project.project_id,
+              attachment_bytes_used=new_bytes_used)
+
+        # Store everything we got from the form.  If the user lacked perms
+        # any attempted edit would be a no-op because of the logic above.
+        amendments, _ = self.services.issue.ApplyIssueComment(
+            mr.cnxn, self.services,
+            mr.auth.user_id, mr.project_id, mr.local_id, summary, status,
+            owner_id, cc_ids, labels, field_values, component_ids,
+            blocked_on_iids, blocking_iids, dangling_blocked_on_refs,
+            dangling_blocking_refs, merge_into_iid,
+            page_gen_ts=page_generation_time, comment=parsed.comment,
+            attachments=parsed.attachments)
+        self.services.project.UpdateRecentActivity(
+            mr.cnxn, mr.project.project_id)
+
+        # Also update the Issue PB we have in RAM so that the correct
+        # CC list will be used for an issue merge.
+        # TODO(jrobbins): refactor the call above to: 1. compute the updates
+        # and update the issue PB in RAM, then 2. store the updated issue.
+        issue.cc_ids = cc_ids
+        issue.labels = labels
+
+      except tracker_helpers.OverAttachmentQuota:
+        mr.errors.attachments = 'Project attachment quota exceeded.'
+
+      if (merge_into_issue and merge_into_iid != orig_merged_into_iid and
+          merge_allowed):
+        tracker_helpers.AddIssueStarrers(
+            mr.cnxn, self.services, mr,
+            merge_into_iid, merge_into_project, new_starrers)
+        merge_comment = tracker_helpers.MergeCCsAndAddComment(
+            self.services, mr, issue, merge_into_project, merge_into_issue)
+      elif merge_into_issue:
+        merge_comment = None
+        logging.info('merge denied: target issue %s not modified',
+                     merge_into_iid)
+      # TODO(jrobbins): distinguish between EditIssue and
+      # AddIssueComment and do just the part that is allowed.
+      # And, give feedback in the source issue if any part of the
+      # merge was not allowed.  Maybe use AJAX to check as the
+      # user types in the issue local ID.
+
+      counts = {actionlimit.ISSUE_COMMENT: 1,
+                actionlimit.ISSUE_ATTACHMENT: len(parsed.attachments)}
+      self.CountRateLimitedActions(mr, counts)
+
+    copy_to_project = CheckCopyIssueRequest(
+        self.services, mr, issue, post_data.get('more_actions') == 'copy',
+        post_data.get('copy_to'), mr.errors)
+    move_to_project = CheckMoveIssueRequest(
+        self.services, mr, issue, post_data.get('more_actions') == 'move',
+        post_data.get('move_to'), mr.errors)
+
+    if mr.errors.AnyErrors():
+      self.PleaseCorrect(
+          mr, initial_summary=parsed.summary,
+          initial_status=parsed.status,
+          initial_owner=parsed.users.owner_username,
+          initial_cc=', '.join(parsed.users.cc_usernames),
+          initial_components=', '.join(parsed.components.paths),
+          initial_comment=parsed.comment,
+          labels=bounce_labels, fields=bounce_fields,
+          initial_blocked_on=parsed.blocked_on.entered_str,
+          initial_blocking=parsed.blocking.entered_str,
+          initial_merge_into=merge_into_text)
+      return
+
+    send_email = 'send_email' in post_data or not permit_edit
+
+    moved_to_project_name_and_local_id = None
+    copied_to_project_name_and_local_id = None
+    if move_to_project:
+      moved_to_project_name_and_local_id = self.HandleCopyOrMove(
+          mr.cnxn, mr, move_to_project, issue, send_email, move=True)
+    elif copy_to_project:
+      copied_to_project_name_and_local_id = self.HandleCopyOrMove(
+          mr.cnxn, mr, copy_to_project, issue, send_email, move=False)
+
+    # TODO(sheyang): use global issue id in case the issue gets moved again
+    # before the task gets processed
+    if amendments or parsed.comment.strip() or parsed.attachments:
+      cmnts = self.services.issue.GetCommentsForIssue(mr.cnxn, issue.issue_id)
+      notify.PrepareAndSendIssueChangeNotification(
+          issue.project_id, issue.local_id, mr.request.host, reporter_id,
+          len(cmnts) - 1, send_email=send_email, old_owner_id=old_owner_id)
+
+    if merge_into_issue and merge_allowed and merge_comment:
+      cmnts = self.services.issue.GetCommentsForIssue(
+          mr.cnxn, merge_into_issue.issue_id)
+      notify.PrepareAndSendIssueChangeNotification(
+          merge_into_issue.project_id, merge_into_issue.local_id,
+          mr.request.host, reporter_id, len(cmnts) - 1, send_email=send_email)
+
+    if permit_edit:
+      # Only users who can edit metadata could have edited blocking.
+      blockers_added, blockers_removed = framework_helpers.ComputeListDeltas(
+          orig_blocked_on, blocked_on_iids)
+      delta_blockers = blockers_added + blockers_removed
+      notify.PrepareAndSendIssueBlockingNotification(
+          issue.project_id, mr.request.host, issue.local_id, delta_blockers,
+          reporter_id, send_email=send_email)
+      # We don't send notification emails to newly blocked issues: either they
+      # know they are blocked, or they don't care and can be fixed anyway.
+      # This is the same behavior as the issue entry page.
+
+    after_issue_update = _DetermineAndSetAfterIssueUpdate(
+        self.services, mr, post_data)
+    return _Redirect(
+        mr, post_data, issue.local_id, config,
+        moved_to_project_name_and_local_id,
+        copied_to_project_name_and_local_id, after_issue_update)
+
+  def HandleCopyOrMove(self, cnxn, mr, dest_project, issue, send_email, move):
+    """Handle Requests dealing with copying or moving an issue between projects.
+
+    Args:
+      cnxn: connection to the database.
+      mr: commonly used info parsed from the request.
+      dest_project: The project protobuf we are moving the issue to.
+      issue: The issue protobuf being moved.
+      send_email: True to send email for these actions.
+      move: Whether this is a move request. The original issue will not exist if
+            this is True.
+
+    Returns:
+      A tuple of (project_id, local_id) of the newly copied / moved issue.
+    """
+    old_text_ref = 'issue %s:%s' % (issue.project_name, issue.local_id)
+    if move:
+      tracker_fulltext.UnindexIssues([issue.issue_id])
+      moved_back_iids = self.services.issue.MoveIssues(
+          cnxn, dest_project, [issue], self.services.user)
+      ret_project_name_and_local_id = (issue.project_name, issue.local_id)
+      new_text_ref = 'issue %s:%s' % ret_project_name_and_local_id
+      if issue.issue_id in moved_back_iids:
+        content = 'Moved %s back to %s again.' % (old_text_ref, new_text_ref)
+      else:
+        content = 'Moved %s to now be %s.' % (old_text_ref, new_text_ref)
+      comment = self.services.issue.CreateIssueComment(
+        mr.cnxn, dest_project.project_id, issue.local_id, mr.auth.user_id,
+        content, amendments=[
+            tracker_bizobj.MakeProjectAmendment(dest_project.project_name)])
+    else:
+      copied_issues = self.services.issue.CopyIssues(
+          cnxn, dest_project, [issue], self.services.user, mr.auth.user_id)
+      copied_issue = copied_issues[0]
+      ret_project_name_and_local_id = (copied_issue.project_name,
+                                       copied_issue.local_id)
+      new_text_ref = 'issue %s:%s' % ret_project_name_and_local_id
+
+      # Add comment to the copied issue.
+      old_issue_content = 'Copied %s to %s' % (old_text_ref, new_text_ref)
+      self.services.issue.CreateIssueComment(
+          mr.cnxn, issue.project_id, issue.local_id, mr.auth.user_id,
+          old_issue_content)
+
+      # Add comment to the newly created issue.
+      # Add project amendment only if the project changed.
+      amendments = []
+      if issue.project_id != copied_issue.project_id:
+        amendments.append(
+            tracker_bizobj.MakeProjectAmendment(dest_project.project_name))
+      new_issue_content = 'Copied %s from %s' % (new_text_ref, old_text_ref)
+      comment = self.services.issue.CreateIssueComment(
+          mr.cnxn, dest_project.project_id, copied_issue.local_id,
+          mr.auth.user_id, new_issue_content, amendments=amendments)
+
+    tracker_fulltext.IndexIssues(
+        mr.cnxn, [issue], self.services.user, self.services.issue,
+        self.services.config)
+
+    if send_email:
+      logging.info('TODO(jrobbins): send email for a move? or combine? %r',
+                   comment)
+
+    return ret_project_name_and_local_id
+
+
+def _DetermineAndSetAfterIssueUpdate(services, mr, post_data):
+  after_issue_update = tracker_constants.DEFAULT_AFTER_ISSUE_UPDATE
+  if 'after_issue_update' in post_data:
+    after_issue_update = user_pb2.IssueUpdateNav(
+        int(post_data['after_issue_update'][0]))
+    if after_issue_update != mr.auth.user_pb.after_issue_update:
+      logging.info('setting after_issue_update to %r', after_issue_update)
+      services.user.UpdateUserSettings(
+          mr.cnxn, mr.auth.user_id, mr.auth.user_pb,
+          after_issue_update=after_issue_update)
+
+  return after_issue_update
+
+
+def _Redirect(
+    mr, post_data, local_id, config, moved_to_project_name_and_local_id,
+    copied_to_project_name_and_local_id, after_issue_update):
+  """Prepare a redirect URL for the issuedetail servlets.
+
+  Args:
+    mr: common information parsed from the HTTP request.
+    post_data: The post_data dict for the current request.
+    local_id: int Issue ID for the current request.
+    config: The ProjectIssueConfig pb for the current request.
+    moved_to_project_name_and_local_id: tuple containing the project name the
+      issue was moved to and the local id in that project.
+    copied_to_project_name_and_local_id: tuple containing the project name the
+      issue was copied to and the local id in that project.
+    after_issue_update: User preference on where to go next.
+
+  Returns:
+    String URL to redirect the user to after processing.
+  """
+  mr.can = int(post_data['can'])
+  mr.query = post_data['q']
+  mr.col_spec = post_data['colspec']
+  mr.sort_spec = post_data['sort']
+  mr.group_by_spec = post_data['groupby']
+  mr.start = int(post_data['start'])
+  mr.num = int(post_data['num'])
+  mr.local_id = local_id
+
+  # format a redirect url
+  next_id = post_data.get('next_id', '')
+  url = _ChooseNextPage(
+      mr, local_id, config, moved_to_project_name_and_local_id,
+      copied_to_project_name_and_local_id, after_issue_update, next_id)
+  logging.debug('Redirecting user to: %s', url)
+  return url
+
+
+def _ComputeBackToListURL(mr, issue, config):
+  """Construct a URL to return the user to the place that they came from."""
+  back_to_list_url = None
+  if not tracker_constants.JUMP_RE.match(mr.query):
+    back_to_list_url = tracker_helpers.FormatIssueListURL(
+        mr, config, cursor='%s:%d' % (issue.project_name, issue.local_id))
+
+  return back_to_list_url
+
+
+def _FieldEditPermitted(
+    labels, blocked_on_str, blocking_str, summary, status, owner_id, cc_ids,
+    page_perms):
+  """Check permissions on editing individual form fields.
+
+  This check is only done if the user does not have the overall
+  EditIssue perm.  If the user edited any field that they do not have
+  permission to edit, then they could have forged a post, or maybe
+  they had a valid form open in a browser tab while at the same time
+  their perms in the project were reduced.  Either way, the servlet
+  gives them a BadRequest HTTP error and makes them go back and try
+  again.
+
+  TODO(jrobbins): It would be better to show a custom error page that
+  takes the user back to the issue with a new page load rather than
+  having the user use the back button.
+
+  Args:
+    labels: list of label values parsed from the form.
+    blocked_on_str: list of blocked-on values parsed from the form.
+    blocking_str: list of blocking values parsed from the form.
+    summary: issue summary string parsed from the form.
+    status: issue status string parsed from the form.
+    owner_id: issue owner user ID parsed from the form and looked up.
+    cc_ids: list of user IDs for Cc'd users parsed from the form.
+    page_perms: object with fields for permissions the current user
+        has on the current issue.
+
+  Returns:
+    True if there was no permission violation.  False if the user tried
+    to edit something that they do not have permission to edit.
+  """
+  if labels or blocked_on_str or blocking_str:
+    logging.info('user has no permission to edit issue metadata')
+    return False
+
+  if summary and not page_perms.EditIssueSummary:
+    logging.info('user has no permission to edit issue summary field')
+    return False
+
+  if status and not page_perms.EditIssueStatus:
+    logging.info('user has no permission to edit issue status field')
+    return False
+
+  if owner_id and not page_perms.EditIssueOwner:
+    logging.info('user has no permission to edit issue owner field')
+    return False
+
+  if cc_ids and not page_perms.EditIssueCc:
+    logging.info('user has no permission to edit issue cc field')
+    return False
+
+  return True
+
+
+def _ChooseNextPage(
+    mr, local_id, config, moved_to_project_name_and_local_id,
+    copied_to_project_name_and_local_id, after_issue_update, next_id):
+  """Choose the next page to show the user after an issue update.
+
+  Args:
+    mr: information parsed from the request.
+    local_id: int Issue ID of the issue that was updated.
+    config: project issue config object.
+    moved_to_project_name_and_local_id: tuple containing the project name the
+      issue was moved to and the local id in that project.
+    copied_to_project_name_and_local_id: tuple containing the project name the
+      issue was copied to and the local id in that project.
+    after_issue_update: user pref on where to go next.
+    next_id: string local ID of next issue at the time the form was generated.
+
+  Returns:
+    String absolute URL of next page to view.
+  """
+  issue_ref_str = '%s:%d' % (mr.project_name, local_id)
+  kwargs = {
+    'ts': int(time.time()),
+    'cursor': issue_ref_str,
+  }
+  if moved_to_project_name_and_local_id:
+    kwargs['moved_to_project'] = moved_to_project_name_and_local_id[0]
+    kwargs['moved_to_id'] = moved_to_project_name_and_local_id[1]
+  elif copied_to_project_name_and_local_id:
+    kwargs['copied_from_id'] = local_id
+    kwargs['copied_to_project'] = copied_to_project_name_and_local_id[0]
+    kwargs['copied_to_id'] = copied_to_project_name_and_local_id[1]
+  else:
+    kwargs['updated'] = local_id
+  url = tracker_helpers.FormatIssueListURL(
+      mr, config, **kwargs)
+
+  if after_issue_update == user_pb2.IssueUpdateNav.STAY_SAME_ISSUE:
+    # If it was a move request then will have to switch to the new project to
+    # stay on the same issue.
+    if moved_to_project_name_and_local_id:
+      mr.project_name = moved_to_project_name_and_local_id[0]
+    url = framework_helpers.FormatAbsoluteURL(
+        mr, urls.ISSUE_DETAIL, id=local_id)
+  elif after_issue_update == user_pb2.IssueUpdateNav.NEXT_IN_LIST:
+    if next_id:
+      url = framework_helpers.FormatAbsoluteURL(
+          mr, urls.ISSUE_DETAIL, id=next_id)
+
+  return url
+
+
+class SetStarForm(jsonfeed.JsonFeed):
+  """Star or unstar the specified issue for the logged in user."""
+
+  def AssertBasePermission(self, mr):
+    super(SetStarForm, self).AssertBasePermission(mr)
+    issue = self.services.issue.GetIssueByLocalID(
+        mr.cnxn, mr.project_id, mr.local_id)
+    if not self.CheckPerm(mr, permissions.SET_STAR, art=issue):
+      raise permissions.PermissionException(
+          'You are not allowed to star issues')
+
+  def HandleRequest(self, mr):
+    """Build up a dictionary of data values to use when rendering the page.
+
+    Args:
+      mr: commonly used info parsed from the request.
+
+    Returns:
+      Dict of values used by EZT for rendering the page.
+    """
+    issue = self.services.issue.GetIssueByLocalID(
+        mr.cnxn, mr.project_id, mr.local_id)
+    config = self.services.config.GetProjectConfig(mr.cnxn, mr.project_id)
+    self.services.issue_star.SetStar(
+        mr.cnxn, self.services, config, issue.issue_id, mr.auth.user_id,
+        mr.starred)
+
+    return {
+        'starred': bool(mr.starred),
+        }
+
+
+def _ShouldShowFlipper(mr, services):
+  """Return True if we should show the flipper."""
+
+  # Check if the user entered a specific issue ID of an existing issue.
+  if tracker_constants.JUMP_RE.match(mr.query):
+    return False
+
+  # Check if the user came directly to an issue without specifying any
+  # query or sort.  E.g., through crbug.com.  Generating the issue ref
+  # list can be too expensive in projects that have a large number of
+  # issues.  The all and open issues cans are broad queries, other
+  # canned queries should be narrow enough to not need this special
+  # treatment.
+  if (not mr.query and not mr.sort_spec and
+      mr.can in [tracker_constants.ALL_ISSUES_CAN,
+                 tracker_constants.OPEN_ISSUES_CAN]):
+    num_issues_in_project = services.issue.GetHighestLocalID(
+        mr.cnxn, mr.project_id)
+    if num_issues_in_project > settings.threshold_to_suppress_prev_next:
+      return False
+
+  return True
+
+
+class _Flipper(object):
+  """Helper class for user to flip among issues within a search result."""
+
+  def __init__(self, mr, services, prof):
+    """Store info for issue flipper widget (prev & next navigation).
+
+    Args:
+      mr: commonly used info parsed from the request.
+      services: connections to backend services.
+      prof: a Profiler for the sevlet's handling of the current request.
+    """
+
+    if not _ShouldShowFlipper(mr, services):
+      self.show = ezt.boolean(False)
+      self.pipeline = None
+      return
+
+    self.pipeline = frontendsearchpipeline.FrontendSearchPipeline(
+        mr, services, prof, None)
+
+    self.services = services
+
+  def SearchForIIDs(self, mr, issue):
+    """Do the next step of searching for issue IDs for the flipper.
+
+    Args:
+      mr: commonly used info parsed from the request.
+      issue: the currently viewed issue.
+    """
+    if not self.pipeline:
+      return
+
+    if not mr.errors.AnyErrors():
+      # Only do the search if the user's query parsed OK.
+      self.pipeline.SearchForIIDs()
+
+    # Note: we never call MergeAndSortIssues() because we don't need a unified
+    # sorted list, we only need to know the position on such a list of the
+    # current issue.
+    prev_iid, cur_index, next_iid = self.pipeline.DetermineIssuePosition(issue)
+
+    logging.info('prev_iid, cur_index, next_iid is %r %r %r',
+                 prev_iid, cur_index, next_iid)
+    # pylint: disable=attribute-defined-outside-init
+    if cur_index is None or self.pipeline.total_count == 1:
+      # The user probably edited the URL, or bookmarked an issue
+      # in a search context that no longer matches the issue.
+      self.show = ezt.boolean(False)
+    else:
+      self.show = True
+      self.current = cur_index + 1
+      self.total_count = self.pipeline.total_count
+      self.next_id = None
+      self.next_project_name = None
+      self.prev_url = ''
+      self.next_url = ''
+
+      if prev_iid:
+        prev_issue = self.services.issue.GetIssue(mr.cnxn, prev_iid)
+        prev_path = '/p/%s%s' % (prev_issue.project_name, urls.ISSUE_DETAIL)
+        self.prev_url = framework_helpers.FormatURL(
+            mr, prev_path, id=prev_issue.local_id)
+
+      if next_iid:
+        next_issue = self.services.issue.GetIssue(mr.cnxn, next_iid)
+        self.next_id = next_issue.local_id
+        self.next_project_name = next_issue.project_name
+        next_path = '/p/%s%s' % (next_issue.project_name, urls.ISSUE_DETAIL)
+        self.next_url = framework_helpers.FormatURL(
+            mr, next_path, id=next_issue.local_id)
+
+  def DebugString(self):
+    """Return a string representation useful in debugging."""
+    if self.show:
+      return 'on %s of %s; prev_url:%s; next_url:%s' % (
+          self.current, self.total_count, self.prev_url, self.next_url)
+    else:
+      return 'invisible flipper(show=%s)' % self.show
+
+
+class IssueCommentDeletion(servlet.Servlet):
+  """Form handler that allows user to delete/undelete comments."""
+
+  def ProcessFormData(self, mr, post_data):
+    """Process the form that un/deletes an issue comment.
+
+    Args:
+      mr: commonly used info parsed from the request.
+      post_data: The post_data dict for the current request.
+
+    Returns:
+      String URL to redirect the user to after processing.
+    """
+    logging.info('post_data = %s', post_data)
+    local_id = int(post_data['id'])
+    sequence_num = int(post_data['sequence_num'])
+    delete = (post_data['mode'] == '1')
+
+    issue = self.services.issue.GetIssueByLocalID(
+        mr.cnxn, mr.project_id, local_id)
+    config = self.services.config.GetProjectConfig(mr.cnxn, mr.project_id)
+
+    all_comments = self.services.issue.GetCommentsForIssue(
+        mr.cnxn, issue.issue_id)
+    logging.info('comments on %s are: %s', local_id, all_comments)
+    comment = all_comments[sequence_num]
+
+    granted_perms = tracker_bizobj.GetGrantedPerms(
+        issue, mr.auth.effective_ids, config)
+
+    if ((comment.is_spam and mr.auth.user_id == comment.user_id) or
+        not permissions.CanDelete(
+        mr.auth.user_id, mr.auth.effective_ids, mr.perms,
+        comment.deleted_by, comment.user_id, mr.project,
+        permissions.GetRestrictions(issue), granted_perms=granted_perms)):
+      raise permissions.PermissionException('Cannot delete comment')
+
+    self.services.issue.SoftDeleteComment(
+        mr.cnxn, mr.project_id, local_id, sequence_num,
+        mr.auth.user_id, self.services.user, delete=delete)
+
+    return framework_helpers.FormatAbsoluteURL(
+        mr, urls.ISSUE_DETAIL, id=local_id)
+
+
+class IssueDeleteForm(servlet.Servlet):
+  """A form handler to delete or undelete an issue.
+
+  Project owners will see a button on every issue to delete it, and
+  if they specifically visit a deleted issue they will see a button to
+  undelete it.
+  """
+
+  def ProcessFormData(self, mr, post_data):
+    """Process the form that un/deletes an issue comment.
+
+    Args:
+      mr: commonly used info parsed from the request.
+      post_data: The post_data dict for the current request.
+
+    Returns:
+      String URL to redirect the user to after processing.
+    """
+    local_id = int(post_data['id'])
+    delete = 'delete' in post_data
+    logging.info('Marking issue %d as deleted: %r', local_id, delete)
+
+    issue = self.services.issue.GetIssueByLocalID(
+        mr.cnxn, mr.project_id, local_id)
+    config = self.services.config.GetProjectConfig(mr.cnxn, mr.project_id)
+    granted_perms = tracker_bizobj.GetGrantedPerms(
+        issue, mr.auth.effective_ids, config)
+    permit_delete = self.CheckPerm(
+        mr, permissions.DELETE_ISSUE, art=issue, granted_perms=granted_perms)
+    if not permit_delete:
+      raise permissions.PermissionException('Cannot un/delete issue')
+
+    self.services.issue.SoftDeleteIssue(
+        mr.cnxn, mr.project_id, local_id, delete, self.services.user)
+
+    return framework_helpers.FormatAbsoluteURL(
+        mr, urls.ISSUE_DETAIL, id=local_id)
+
+# TODO(jrobbins): do we want this?
+# class IssueDerivedLabelsJSON(jsonfeed.JsonFeed)
+
+
+def CheckCopyIssueRequest(
+    services, mr, issue, copy_selected, copy_to, errors):
+  """Process the copy issue portions of the issue update form.
+
+  Args:
+    services: A Services object
+    mr: commonly used info parsed from the request.
+    issue: Issue protobuf for the issue being copied.
+    copy_selected: True if the user selected the Copy action.
+    copy_to: A project_name or url to copy this issue to or None
+      if the project name wasn't sent in the form.
+    errors: The errors object for this request.
+
+    Returns:
+      The project pb for the project the issue will be copy to
+      or None if the copy cannot be performed. Perhaps because
+      the project does not exist, in which case copy_to and
+      copy_to_project will be set on the errors object. Perhaps
+      the user does not have permission to copy the issue to the
+      destination project, in which case the copy_to field will be
+      set on the errors object.
+  """
+  if not copy_selected:
+    return None
+
+  if not copy_to:
+    errors.copy_to = 'No destination project specified'
+    errors.copy_to_project = copy_to
+    return None
+
+  copy_to_project = services.project.GetProjectByName(mr.cnxn, copy_to)
+  if not copy_to_project:
+    errors.copy_to = 'No such project: ' + copy_to
+    errors.copy_to_project = copy_to
+    return None
+
+  # permissions enforcement
+  if not servlet_helpers.CheckPermForProject(
+      mr, permissions.EDIT_ISSUE, copy_to_project):
+    errors.copy_to = 'You do not have permission to copy issues to project'
+    errors.copy_to_project = copy_to
+    return None
+
+  elif permissions.GetRestrictions(issue):
+    errors.copy_to = (
+        'Issues with Restrict labels are not allowed to be copied.')
+    errors.copy_to_project = ''
+    return None
+
+  return copy_to_project
+
+
+def CheckMoveIssueRequest(
+    services, mr, issue, move_selected, move_to, errors):
+  """Process the move issue portions of the issue update form.
+
+  Args:
+    services: A Services object
+    mr: commonly used info parsed from the request.
+    issue: Issue protobuf for the issue being moved.
+    move_selected: True if the user selected the Move action.
+    move_to: A project_name or url to move this issue to or None
+      if the project name wasn't sent in the form.
+    errors: The errors object for this request.
+
+    Returns:
+      The project pb for the project the issue will be moved to
+      or None if the move cannot be performed. Perhaps because
+      the project does not exist, in which case move_to and
+      move_to_project will be set on the errors object. Perhaps
+      the user does not have permission to move the issue to the
+      destination project, in which case the move_to field will be
+      set on the errors object.
+  """
+  if not move_selected:
+    return None
+
+  if not move_to:
+    errors.move_to = 'No destination project specified'
+    errors.move_to_project = move_to
+    return None
+
+  if issue.project_name == move_to:
+    errors.move_to = 'This issue is already in project ' + move_to
+    errors.move_to_project = move_to
+    return None
+
+  move_to_project = services.project.GetProjectByName(mr.cnxn, move_to)
+  if not move_to_project:
+    errors.move_to = 'No such project: ' + move_to
+    errors.move_to_project = move_to
+    return None
+
+  # permissions enforcement
+  if not servlet_helpers.CheckPermForProject(
+      mr, permissions.EDIT_ISSUE, move_to_project):
+    errors.move_to = 'You do not have permission to move issues to project'
+    errors.move_to_project = move_to
+    return None
+
+  elif permissions.GetRestrictions(issue):
+    errors.move_to = (
+        'Issues with Restrict labels are not allowed to be moved.')
+    errors.move_to_project = ''
+    return None
+
+  return move_to_project