Open Source Monorail

appengine/monorail/framework/framework_bizobj.py

Index: appengine/monorail/framework/framework_bizobj.py
diff --git a/appengine/monorail/framework/framework_bizobj.py b/appengine/monorail/framework/framework_bizobj.py
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+# 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
+
+"""Business objects for Monorail's framework.
+
+These are classes and functions that operate on the objects that
+users care about in Monorail but that are not part of just one specific
+component: e.g., projects, users, and labels.
+"""
+
+import logging
+import re
+import string
+
+import settings
+from framework import framework_constants
+
+
+# Pattern to match a valid project name.  Users of this pattern MUST use
+# the re.VERBOSE flag or the whitespace and comments we be considered
+# significant and the pattern will not work.  See "re" module documentation.
+_RE_PROJECT_NAME_PATTERN_VERBOSE = r"""
+  (?=[-a-z0-9]*[a-z][-a-z0-9]*)   # Lookahead to make sure there is at least
+                                  # one letter in the whole name.
+  [a-z0-9]                        # Start with a letter or digit.
+  [-a-z0-9]*                      # Follow with any number of valid characters.
+  [a-z0-9]                        # End with a letter or digit.
+"""
+
+
+# Compiled regexp to match the project name and nothing more before or after.
+RE_PROJECT_NAME = re.compile(
+    '^%s$' % _RE_PROJECT_NAME_PATTERN_VERBOSE, re.VERBOSE)
+
+
+def IsValidProjectName(s):
+  """Return true if the given string is a valid project name."""
+  return (RE_PROJECT_NAME.match(s) and
+          len(s) <= framework_constants.MAX_PROJECT_NAME_LENGTH)
+
+
+def UserOwnsProject(project, effective_ids):
+  """Return True if any of the effective_ids is a project owner."""
+  return not effective_ids.isdisjoint(project.owner_ids or set())
+
+
+def UserIsInProject(project, effective_ids):
+  """Return True if any of the effective_ids is a project member.
+
+  Args:
+    project: Project PB for the current project.
+    effective_ids: set of int user IDs for the current user (including all
+        user groups).  This will be an empty set for anonymous users.
+
+  Returns:
+    True if the user has any direct or indirect role in the project.  The value
+    will actually be a set(), but it will have an ID in it if the user is in
+    the project, or it will be an empty set which is considered False.
+  """
+  return (UserOwnsProject(project, effective_ids) or
+          not effective_ids.isdisjoint(project.committer_ids or set()) or
+          not effective_ids.isdisjoint(project.contributor_ids or set()))
+
+
+def AllProjectMembers(project):
+  """Return a list of user IDs of all members in the given project."""
+  return project.owner_ids + project.committer_ids + project.contributor_ids
+
+
+def IsPriviledgedDomainUser(email):
+  """Return True if the user's account is from a priviledged domain."""
+  if email and '@' in email:
+    _, user_domain = email.split('@', 1)
+    return user_domain in settings.priviledged_user_domains
+
+  return False
+
+
+
+# String translation table to catch a common typos in label names.
+_CANONICALIZATION_TRANSLATION_TABLE = {
+    ord(delete_u_char): None
+    for delete_u_char in u'!"#$%&\'()*+,/:;<>?@[\\]^`{|}~\t\n\x0b\x0c\r '
+    }
+_CANONICALIZATION_TRANSLATION_TABLE.update({ord(u'='): ord(u'-')})
+
+
+def CanonicalizeLabel(user_input):
+  """Canonicalize a given label or status value.
+
+  When the user enters a string that represents a label or an enum,
+  convert it a canonical form that makes it more likely to match
+  existing values.
+
+  Args:
+    user_input: string that the user typed for a label.
+
+  Returns:
+    Canonical form of that label as a unicode string.
+  """
+  if user_input is None:
+    return user_input
+
+  if not isinstance(user_input, unicode):
+    user_input = user_input.decode('utf-8')
+
+  canon_str = user_input.translate(_CANONICALIZATION_TRANSLATION_TABLE)
+  return canon_str
+
+
+def MergeLabels(labels_list, labels_add, labels_remove, excl_prefixes):
+  """Update a list of labels with the given add and remove label lists.
+
+  Args:
+    labels_list: list of current labels.
+    labels_add: labels that the user wants to add.
+    labels_remove: labels that the user wants to remove.
+    excl_prefixes: prefixes that can have only one value, e.g., Priority.
+
+  Returns:
+    (merged_labels, update_labels_add, update_labels_remove):
+    A new list of labels with the given labels added and removed, and
+    any exclusive label prefixes taken into account. Then two
+    lists of update strings to explain the changes that were actually
+    made.
+  """
+  old_lower_labels = [lab.lower() for lab in labels_list]
+  labels_add = [lab for lab in labels_add
+                if lab.lower() not in old_lower_labels]
+  labels_remove = [lab for lab in labels_remove
+                   if lab.lower() in old_lower_labels]
+  labels_remove_lower = [lab.lower() for lab in labels_remove]
+  config_excl = [lab.lower() for lab in excl_prefixes]
+
+  # "Old minus exclusive" is the set of old label values minus any
+  # that are implictly removed by newly set exclusive labels.
+  excl_add = []  # E.g., there can be only one "Priority-*" label
+  for lab in labels_add:
+    prefix = lab.split('-')[0].lower()
+    if prefix in config_excl:
+      excl_add.append('%s-' % prefix)
+  old_minus_excl = []
+  for lab in labels_list:
+    for prefix_dash in excl_add:
+      if lab.lower().startswith(prefix_dash):
+        # Note: don't add -lab to update_labels_remove, it is implicit.
+        break
+    else:
+      old_minus_excl.append(lab)
+
+  merged_labels = [lab for lab in old_minus_excl + labels_add
+                   if lab.lower() not in labels_remove_lower]
+
+  return merged_labels, labels_add, labels_remove