bugzilla: add a rest api backend (usable with bugzilla 5.0+)

Add support for the bugzilla rest api documented at
 https://wiki.mozilla.org/Bugzilla:REST_API
and at
 https://bugzilla.readthedocs.io/en/latest/

This backend has the following benefits:
* It supports the bugzilla api keys so hgrc does not need to contain
  a user's bugzilla password
* Works with Mercurial's "hostfingerprints" support making handling
  bugzilla instances with self-signed certs easier
* Does not use xmlrpc ;-)

Adds configuration item 'apikey' in [bugzilla] section.

My major concern with these patches is if the approach to HTTP access
is the right way for an extension and if hooking into request object
and the overriding the get_method to perform PUT requests was a
sensible approach.

# no-check-commit

hgext/bugzilla.py

@@ -1,928 +1,1075 b''
 # bugzilla.py - bugzilla integration for mercurial
 #
 # Copyright 2006 Vadim Gelfer <[e-mail]>
 # Copyright 2011-4 Jim Hague <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 '''hooks for integrating with the Bugzilla bug tracker
 
 This hook extension adds comments on bugs in Bugzilla when changesets
 that refer to bugs by Bugzilla ID are seen. The comment is formatted using
 the Mercurial template mechanism.
 
 The bug references can optionally include an update for Bugzilla of the
 hours spent working on the bug. Bugs can also be marked fixed.
 
-Three basic modes of access to Bugzilla are provided:
+Four basic modes of access to Bugzilla are provided:
+
+1. Access via the Bugzilla REST-API. Requires bugzilla 5.0 or later.
 
-1. Access via the Bugzilla XMLRPC interface. Requires Bugzilla 3.4 or later.
+2. Access via the Bugzilla XMLRPC interface. Requires Bugzilla 3.4 or later.
 
-2. Check data via the Bugzilla XMLRPC interface and submit bug change
+3. Check data via the Bugzilla XMLRPC interface and submit bug change
    via email to Bugzilla email interface. Requires Bugzilla 3.4 or later.
 
-3. Writing directly to the Bugzilla database. Only Bugzilla installations
+4. Writing directly to the Bugzilla database. Only Bugzilla installations
    using MySQL are supported. Requires Python MySQLdb.
 
 Writing directly to the database is susceptible to schema changes, and
 relies on a Bugzilla contrib script to send out bug change
 notification emails. This script runs as the user running Mercurial,
 must be run on the host with the Bugzilla install, and requires
 permission to read Bugzilla configuration details and the necessary
 MySQL user and password to have full access rights to the Bugzilla
 database. For these reasons this access mode is now considered
 deprecated, and will not be updated for new Bugzilla versions going
 forward. Only adding comments is supported in this access mode.
 
 Access via XMLRPC needs a Bugzilla username and password to be specified
 in the configuration. Comments are added under that username. Since the
 configuration must be readable by all Mercurial users, it is recommended
 that the rights of that user are restricted in Bugzilla to the minimum
 necessary to add comments. Marking bugs fixed requires Bugzilla 4.0 and later.
 
 Access via XMLRPC/email uses XMLRPC to query Bugzilla, but sends
 email to the Bugzilla email interface to submit comments to bugs.
 The From: address in the email is set to the email address of the Mercurial
 user, so the comment appears to come from the Mercurial user. In the event
 that the Mercurial user email is not recognized by Bugzilla as a Bugzilla
 user, the email associated with the Bugzilla username used to log into
 Bugzilla is used instead as the source of the comment. Marking bugs fixed
 works on all supported Bugzilla versions.
 
+Access via the REST-API needs either a Bugzilla username and password
+or an apikey specified in the configuration. Comments are made under
+the given username or the user assoicated with the apikey in Bugzilla.
+
 Configuration items common to all access modes:
 
 bugzilla.version
   The access type to use. Values recognized are:
 
+  :``restapi``:      Bugzilla REST-API, Bugzilla 5.0 and later.
   :``xmlrpc``:       Bugzilla XMLRPC interface.
   :``xmlrpc+email``: Bugzilla XMLRPC and email interfaces.
   :``3.0``:          MySQL access, Bugzilla 3.0 and later.
   :``2.18``:         MySQL access, Bugzilla 2.18 and up to but not
                      including 3.0.
   :``2.16``:         MySQL access, Bugzilla 2.16 and up to but not
                      including 2.18.
 
 bugzilla.regexp
   Regular expression to match bug IDs for update in changeset commit message.
   It must contain one "()" named group ``<ids>`` containing the bug
   IDs separated by non-digit characters. It may also contain
   a named group ``<hours>`` with a floating-point number giving the
   hours worked on the bug. If no named groups are present, the first
   "()" group is assumed to contain the bug IDs, and work time is not
   updated. The default expression matches ``Bug 1234``, ``Bug no. 1234``,
   ``Bug number 1234``, ``Bugs 1234,5678``, ``Bug 1234 and 5678`` and
   variations thereof, followed by an hours number prefixed by ``h`` or
   ``hours``, e.g. ``hours 1.5``. Matching is case insensitive.
 
 bugzilla.fixregexp
   Regular expression to match bug IDs for marking fixed in changeset
   commit message. This must contain a "()" named group ``<ids>` containing
   the bug IDs separated by non-digit characters. It may also contain
   a named group ``<hours>`` with a floating-point number giving the
   hours worked on the bug. If no named groups are present, the first
   "()" group is assumed to contain the bug IDs, and work time is not
   updated. The default expression matches ``Fixes 1234``, ``Fixes bug 1234``,
   ``Fixes bugs 1234,5678``, ``Fixes 1234 and 5678`` and
   variations thereof, followed by an hours number prefixed by ``h`` or
   ``hours``, e.g. ``hours 1.5``. Matching is case insensitive.
 
 bugzilla.fixstatus
   The status to set a bug to when marking fixed. Default ``RESOLVED``.
 
 bugzilla.fixresolution
   The resolution to set a bug to when marking fixed. Default ``FIXED``.
 
 bugzilla.style
   The style file to use when formatting comments.
 
 bugzilla.template
   Template to use when formatting comments. Overrides style if
   specified. In addition to the usual Mercurial keywords, the
   extension specifies:
 
   :``{bug}``:     The Bugzilla bug ID.
   :``{root}``:    The full pathname of the Mercurial repository.
   :``{webroot}``: Stripped pathname of the Mercurial repository.
   :``{hgweb}``:   Base URL for browsing Mercurial repositories.
 
   Default ``changeset {node|short} in repo {root} refers to bug
   {bug}.\\ndetails:\\n\\t{desc|tabindent}``
 
 bugzilla.strip
   The number of path separator characters to strip from the front of
   the Mercurial repository path (``{root}`` in templates) to produce
   ``{webroot}``. For example, a repository with ``{root}``
   ``/var/local/my-project`` with a strip of 2 gives a value for
   ``{webroot}`` of ``my-project``. Default 0.
 
 web.baseurl
   Base URL for browsing Mercurial repositories. Referenced from
   templates as ``{hgweb}``.
 
 Configuration items common to XMLRPC+email and MySQL access modes:
 
 bugzilla.usermap
   Path of file containing Mercurial committer email to Bugzilla user email
   mappings. If specified, the file should contain one mapping per
   line::
 
     committer = Bugzilla user
 
   See also the ``[usermap]`` section.
 
 The ``[usermap]`` section is used to specify mappings of Mercurial
 committer email to Bugzilla user email. See also ``bugzilla.usermap``.
 Contains entries of the form ``committer = Bugzilla user``.
 
-XMLRPC access mode configuration:
+XMLRPC and REST-API access mode configuration:
 
 bugzilla.bzurl
   The base URL for the Bugzilla installation.
   Default ``http://localhost/bugzilla``.
 
 bugzilla.user
   The username to use to log into Bugzilla via XMLRPC. Default
   ``bugs``.
 
 bugzilla.password
   The password for Bugzilla login.
 
+REST-API access mode uses the options listed above as well as:
+
+bugzilla.apikey
+  An apikey generated on the Bugzilla instance for api access.
+  Using an apikey removes the need to store the user and password
+  options.
+
 XMLRPC+email access mode uses the XMLRPC access mode configuration items,
 and also:
 
 bugzilla.bzemail
   The Bugzilla email address.
 
 In addition, the Mercurial email settings must be configured. See the
 documentation in hgrc(5), sections ``[email]`` and ``[smtp]``.
 
 MySQL access mode configuration:
 
 bugzilla.host
   Hostname of the MySQL server holding the Bugzilla database.
   Default ``localhost``.
 
 bugzilla.db
   Name of the Bugzilla database in MySQL. Default ``bugs``.
 
 bugzilla.user
   Username to use to access MySQL server. Default ``bugs``.
 
 bugzilla.password
   Password to use to access MySQL server.
 
 bugzilla.timeout
   Database connection timeout (seconds). Default 5.
 
 bugzilla.bzuser
   Fallback Bugzilla user name to record comments with, if changeset
   committer cannot be found as a Bugzilla user.
 
 bugzilla.bzdir
    Bugzilla install directory. Used by default notify. Default
    ``/var/www/html/bugzilla``.
 
 bugzilla.notify
   The command to run to get Bugzilla to send bug change notification
   emails. Substitutes from a map with 3 keys, ``bzdir``, ``id`` (bug
   id) and ``user`` (committer bugzilla email). Default depends on
   version; from 2.18 it is "cd %(bzdir)s && perl -T
   contrib/sendbugmail.pl %(id)s %(user)s".
 
 Activating the extension::
 
     [extensions]
     bugzilla =
 
     [hooks]
     # run bugzilla hook on every change pulled or pushed in here
     incoming.bugzilla = python:hgext.bugzilla.hook
 
 Example configurations:
 
 XMLRPC example configuration. This uses the Bugzilla at
 ``http://my-project.org/bugzilla``, logging in as user
 ``[e-mail]`` with password ``plugh``. It is used with a
 collection of Mercurial repositories in ``/var/local/hg/repos/``,
 with a web interface at ``http://my-project.org/hg``. ::
 
     [bugzilla]
     bzurl=http://my-project.org/bugzilla
     user=[e-mail]
     password=plugh
     version=xmlrpc
     template=Changeset {node|short} in {root|basename}.
              {hgweb}/{webroot}/rev/{node|short}\\n
              {desc}\\n
     strip=5
 
     [web]
     baseurl=http://my-project.org/hg
 
 XMLRPC+email example configuration. This uses the Bugzilla at
 ``http://my-project.org/bugzilla``, logging in as user
 ``[e-mail]`` with password ``plugh``. It is used with a
 collection of Mercurial repositories in ``/var/local/hg/repos/``,
 with a web interface at ``http://my-project.org/hg``. Bug comments
 are sent to the Bugzilla email address
 ``[e-mail]``. ::
 
     [bugzilla]
     bzurl=http://my-project.org/bugzilla
     user=[e-mail]
     password=plugh
     version=xmlrpc+email
     bzemail=[e-mail]
     template=Changeset {node|short} in {root|basename}.
              {hgweb}/{webroot}/rev/{node|short}\\n
              {desc}\\n
     strip=5
 
     [web]
     baseurl=http://my-project.org/hg
 
     [usermap]
     [e-mail]=[e-mail]
 
 MySQL example configuration. This has a local Bugzilla 3.2 installation
 in ``/opt/bugzilla-3.2``. The MySQL database is on ``localhost``,
 the Bugzilla database name is ``bugs`` and MySQL is
 accessed with MySQL username ``bugs`` password ``XYZZY``. It is used
 with a collection of Mercurial repositories in ``/var/local/hg/repos/``,
 with a web interface at ``http://my-project.org/hg``. ::
 
     [bugzilla]
     host=localhost
     password=XYZZY
     version=3.0
     bzuser=[e-mail]
     bzdir=/opt/bugzilla-3.2
     template=Changeset {node|short} in {root|basename}.
              {hgweb}/{webroot}/rev/{node|short}\\n
              {desc}\\n
     strip=5
 
     [web]
     baseurl=http://my-project.org/hg
 
     [usermap]
     [e-mail]=[e-mail]
 
 All the above add a comment to the Bugzilla bug record of the form::
 
     Changeset 3b16791d6642 in repository-name.
     http://my-project.org/hg/repository-name/rev/3b16791d6642
 
     Changeset commit comment. Bug 1234.
 '''
 
 from __future__ import absolute_import
 
+import json
 import re
 import time
 
 from mercurial.i18n import _
 from mercurial.node import short
 from mercurial import (
     cmdutil,
     error,
     mail,
+    url,
     util,
 )
 
 urlparse = util.urlparse
 xmlrpclib = util.xmlrpclib
 
 # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for
 # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
 # be specifying the version(s) of Mercurial they are tested with, or
 # leave the attribute unspecified.
 testedwith = 'ships-with-hg-core'
 
 class bzaccess(object):
     '''Base class for access to Bugzilla.'''
 
     def __init__(self, ui):
         self.ui = ui
         usermap = self.ui.config('bugzilla', 'usermap')
         if usermap:
             self.ui.readconfig(usermap, sections=['usermap'])
 
     def map_committer(self, user):
         '''map name of committer to Bugzilla user name.'''
         for committer, bzuser in self.ui.configitems('usermap'):
             if committer.lower() == user.lower():
                 return bzuser
         return user
 
     # Methods to be implemented by access classes.
     #
     # 'bugs' is a dict keyed on bug id, where values are a dict holding
     # updates to bug state. Recognized dict keys are:
     #
     # 'hours': Value, float containing work hours to be updated.
     # 'fix':   If key present, bug is to be marked fixed. Value ignored.
 
     def filter_real_bug_ids(self, bugs):
         '''remove bug IDs that do not exist in Bugzilla from bugs.'''
         pass
 
     def filter_cset_known_bug_ids(self, node, bugs):
         '''remove bug IDs where node occurs in comment text from bugs.'''
         pass
 
     def updatebug(self, bugid, newstate, text, committer):
         '''update the specified bug. Add comment text and set new states.
 
         If possible add the comment as being from the committer of
         the changeset. Otherwise use the default Bugzilla user.
         '''
         pass
 
     def notify(self, bugs, committer):
         '''Force sending of Bugzilla notification emails.
 
         Only required if the access method does not trigger notification
         emails automatically.
         '''
         pass
 
 # Bugzilla via direct access to MySQL database.
 class bzmysql(bzaccess):
     '''Support for direct MySQL access to Bugzilla.
 
     The earliest Bugzilla version this is tested with is version 2.16.
 
     If your Bugzilla is version 3.4 or above, you are strongly
     recommended to use the XMLRPC access method instead.
     '''
 
     @staticmethod
     def sql_buglist(ids):
         '''return SQL-friendly list of bug ids'''
         return '(' + ','.join(map(str, ids)) + ')'
 
     _MySQLdb = None
 
     def __init__(self, ui):
         try:
             import MySQLdb as mysql
             bzmysql._MySQLdb = mysql
         except ImportError as err:
             raise error.Abort(_('python mysql support not available: %s') % err)
 
         bzaccess.__init__(self, ui)
 
         host = self.ui.config('bugzilla', 'host', 'localhost')
         user = self.ui.config('bugzilla', 'user', 'bugs')
         passwd = self.ui.config('bugzilla', 'password')
         db = self.ui.config('bugzilla', 'db', 'bugs')
         timeout = int(self.ui.config('bugzilla', 'timeout', 5))
         self.ui.note(_('connecting to %s:%s as %s, password %s\n') %
                      (host, db, user, '*' * len(passwd)))
         self.conn = bzmysql._MySQLdb.connect(host=host,
                                                    user=user, passwd=passwd,
                                                    db=db,
                                                    connect_timeout=timeout)
         self.cursor = self.conn.cursor()
         self.longdesc_id = self.get_longdesc_id()
         self.user_ids = {}
         self.default_notify = "cd %(bzdir)s && ./processmail %(id)s %(user)s"
 
     def run(self, *args, **kwargs):
         '''run a query.'''
         self.ui.note(_('query: %s %s\n') % (args, kwargs))
         try:
             self.cursor.execute(*args, **kwargs)
         except bzmysql._MySQLdb.MySQLError:
             self.ui.note(_('failed query: %s %s\n') % (args, kwargs))
             raise
 
     def get_longdesc_id(self):
         '''get identity of longdesc field'''
         self.run('select fieldid from fielddefs where name = "longdesc"')
         ids = self.cursor.fetchall()
         if len(ids) != 1:
             raise error.Abort(_('unknown database schema'))
         return ids[0][0]
 
     def filter_real_bug_ids(self, bugs):
         '''filter not-existing bugs from set.'''
         self.run('select bug_id from bugs where bug_id in %s' %
                  bzmysql.sql_buglist(bugs.keys()))
         existing = [id for (id,) in self.cursor.fetchall()]
         for id in bugs.keys():
             if id not in existing:
                 self.ui.status(_('bug %d does not exist\n') % id)
                 del bugs[id]
 
     def filter_cset_known_bug_ids(self, node, bugs):
         '''filter bug ids that already refer to this changeset from set.'''
         self.run('''select bug_id from longdescs where
                     bug_id in %s and thetext like "%%%s%%"''' %
                  (bzmysql.sql_buglist(bugs.keys()), short(node)))
         for (id,) in self.cursor.fetchall():
             self.ui.status(_('bug %d already knows about changeset %s\n') %
                            (id, short(node)))
             del bugs[id]
 
     def notify(self, bugs, committer):
         '''tell bugzilla to send mail.'''
         self.ui.status(_('telling bugzilla to send mail:\n'))
         (user, userid) = self.get_bugzilla_user(committer)
         for id in bugs.keys():
             self.ui.status(_('  bug %s\n') % id)
             cmdfmt = self.ui.config('bugzilla', 'notify', self.default_notify)
             bzdir = self.ui.config('bugzilla', 'bzdir',
                                    '/var/www/html/bugzilla')
             try:
                 # Backwards-compatible with old notify string, which
                 # took one string. This will throw with a new format
                 # string.
                 cmd = cmdfmt % id
             except TypeError:
                 cmd = cmdfmt % {'bzdir': bzdir, 'id': id, 'user': user}
             self.ui.note(_('running notify command %s\n') % cmd)
             fp = util.popen('(%s) 2>&1' % cmd)
             out = fp.read()
             ret = fp.close()
             if ret:
                 self.ui.warn(out)
                 raise error.Abort(_('bugzilla notify command %s') %
                                  util.explainexit(ret)[0])
         self.ui.status(_('done\n'))
 
     def get_user_id(self, user):
         '''look up numeric bugzilla user id.'''
         try:
             return self.user_ids[user]
         except KeyError:
             try:
                 userid = int(user)
             except ValueError:
                 self.ui.note(_('looking up user %s\n') % user)
                 self.run('''select userid from profiles
                             where login_name like %s''', user)
                 all = self.cursor.fetchall()
                 if len(all) != 1:
                     raise KeyError(user)
                 userid = int(all[0][0])
             self.user_ids[user] = userid
             return userid
 
     def get_bugzilla_user(self, committer):
         '''See if committer is a registered bugzilla user. Return
         bugzilla username and userid if so. If not, return default
         bugzilla username and userid.'''
         user = self.map_committer(committer)
         try:
             userid = self.get_user_id(user)
         except KeyError:
             try:
                 defaultuser = self.ui.config('bugzilla', 'bzuser')
                 if not defaultuser:
                     raise error.Abort(_('cannot find bugzilla user id for %s') %
                                      user)
                 userid = self.get_user_id(defaultuser)
                 user = defaultuser
             except KeyError:
                 raise error.Abort(_('cannot find bugzilla user id for %s or %s')
                                  % (user, defaultuser))
         return (user, userid)
 
     def updatebug(self, bugid, newstate, text, committer):
         '''update bug state with comment text.
 
         Try adding comment as committer of changeset, otherwise as
         default bugzilla user.'''
         if len(newstate) > 0:
             self.ui.warn(_("Bugzilla/MySQL cannot update bug state\n"))
 
         (user, userid) = self.get_bugzilla_user(committer)
         now = time.strftime('%Y-%m-%d %H:%M:%S')
         self.run('''insert into longdescs
                     (bug_id, who, bug_when, thetext)
                     values (%s, %s, %s, %s)''',
                  (bugid, userid, now, text))
         self.run('''insert into bugs_activity (bug_id, who, bug_when, fieldid)
                     values (%s, %s, %s, %s)''',
                  (bugid, userid, now, self.longdesc_id))
         self.conn.commit()
 
 class bzmysql_2_18(bzmysql):
     '''support for bugzilla 2.18 series.'''
 
     def __init__(self, ui):
         bzmysql.__init__(self, ui)
         self.default_notify = \
             "cd %(bzdir)s && perl -T contrib/sendbugmail.pl %(id)s %(user)s"
 
 class bzmysql_3_0(bzmysql_2_18):
     '''support for bugzilla 3.0 series.'''
 
     def __init__(self, ui):
         bzmysql_2_18.__init__(self, ui)
 
     def get_longdesc_id(self):
         '''get identity of longdesc field'''
         self.run('select id from fielddefs where name = "longdesc"')
         ids = self.cursor.fetchall()
         if len(ids) != 1:
             raise error.Abort(_('unknown database schema'))
         return ids[0][0]
 
 # Bugzilla via XMLRPC interface.
 
 class cookietransportrequest(object):
     """A Transport request method that retains cookies over its lifetime.
 
     The regular xmlrpclib transports ignore cookies. Which causes
     a bit of a problem when you need a cookie-based login, as with
     the Bugzilla XMLRPC interface prior to 4.4.3.
 
     So this is a helper for defining a Transport which looks for
     cookies being set in responses and saves them to add to all future
     requests.
     """
 
     # Inspiration drawn from
     # http://blog.godson.in/2010/09/how-to-make-python-xmlrpclib-client.html
     # http://www.itkovian.net/base/transport-class-for-pythons-xml-rpc-lib/
 
     cookies = []
     def send_cookies(self, connection):
         if self.cookies:
             for cookie in self.cookies:
                 connection.putheader("Cookie", cookie)
 
     def request(self, host, handler, request_body, verbose=0):
         self.verbose = verbose
         self.accept_gzip_encoding = False
 
         # issue XML-RPC request
         h = self.make_connection(host)
         if verbose:
             h.set_debuglevel(1)
 
         self.send_request(h, handler, request_body)
         self.send_host(h, host)
         self.send_cookies(h)
         self.send_user_agent(h)
         self.send_content(h, request_body)
 
         # Deal with differences between Python 2.6 and 2.7.
         # In the former h is a HTTP(S). In the latter it's a
         # HTTP(S)Connection. Luckily, the 2.6 implementation of
         # HTTP(S) has an underlying HTTP(S)Connection, so extract
         # that and use it.
         try:
             response = h.getresponse()
         except AttributeError:
             response = h._conn.getresponse()
 
         # Add any cookie definitions to our list.
         for header in response.msg.getallmatchingheaders("Set-Cookie"):
             val = header.split(": ", 1)[1]
             cookie = val.split(";", 1)[0]
             self.cookies.append(cookie)
 
         if response.status != 200:
             raise xmlrpclib.ProtocolError(host + handler, response.status,
                                           response.reason, response.msg.headers)
 
         payload = response.read()
         parser, unmarshaller = self.getparser()
         parser.feed(payload)
         parser.close()
 
         return unmarshaller.close()
 
 # The explicit calls to the underlying xmlrpclib __init__() methods are
 # necessary. The xmlrpclib.Transport classes are old-style classes, and
 # it turns out their __init__() doesn't get called when doing multiple
 # inheritance with a new-style class.
 class cookietransport(cookietransportrequest, xmlrpclib.Transport):
     def __init__(self, use_datetime=0):
         if util.safehasattr(xmlrpclib.Transport, "__init__"):
             xmlrpclib.Transport.__init__(self, use_datetime)
 
 class cookiesafetransport(cookietransportrequest, xmlrpclib.SafeTransport):
     def __init__(self, use_datetime=0):
         if util.safehasattr(xmlrpclib.Transport, "__init__"):
             xmlrpclib.SafeTransport.__init__(self, use_datetime)
 
 class bzxmlrpc(bzaccess):
     """Support for access to Bugzilla via the Bugzilla XMLRPC API.
 
     Requires a minimum Bugzilla version 3.4.
     """
 
     def __init__(self, ui):
         bzaccess.__init__(self, ui)
 
         bzweb = self.ui.config('bugzilla', 'bzurl',
                                'http://localhost/bugzilla/')
         bzweb = bzweb.rstrip("/") + "/xmlrpc.cgi"
 
         user = self.ui.config('bugzilla', 'user', 'bugs')
         passwd = self.ui.config('bugzilla', 'password')
 
         self.fixstatus = self.ui.config('bugzilla', 'fixstatus', 'RESOLVED')
         self.fixresolution = self.ui.config('bugzilla', 'fixresolution',
                                             'FIXED')
 
         self.bzproxy = xmlrpclib.ServerProxy(bzweb, self.transport(bzweb))
         ver = self.bzproxy.Bugzilla.version()['version'].split('.')
         self.bzvermajor = int(ver[0])
         self.bzverminor = int(ver[1])
         login = self.bzproxy.User.login({'login': user, 'password': passwd,
                                          'restrict_login': True})
         self.bztoken = login.get('token', '')
 
     def transport(self, uri):
         if urlparse.urlparse(uri, "http")[0] == "https":
             return cookiesafetransport()
         else:
             return cookietransport()
 
     def get_bug_comments(self, id):
         """Return a string with all comment text for a bug."""
         c = self.bzproxy.Bug.comments({'ids': [id],
                                        'include_fields': ['text'],
                                        'token': self.bztoken})
         return ''.join([t['text'] for t in c['bugs'][str(id)]['comments']])
 
     def filter_real_bug_ids(self, bugs):
         probe = self.bzproxy.Bug.get({'ids': sorted(bugs.keys()),
                                       'include_fields': [],
                                       'permissive': True,
                                       'token': self.bztoken,
                                       })
         for badbug in probe['faults']:
             id = badbug['id']
             self.ui.status(_('bug %d does not exist\n') % id)
             del bugs[id]
 
     def filter_cset_known_bug_ids(self, node, bugs):
         for id in sorted(bugs.keys()):
             if self.get_bug_comments(id).find(short(node)) != -1:
                 self.ui.status(_('bug %d already knows about changeset %s\n') %
                                (id, short(node)))
                 del bugs[id]
 
     def updatebug(self, bugid, newstate, text, committer):
         args = {}
         if 'hours' in newstate:
             args['work_time'] = newstate['hours']
 
         if self.bzvermajor >= 4:
             args['ids'] = [bugid]
             args['comment'] = {'body' : text}
             if 'fix' in newstate:
                 args['status'] = self.fixstatus
                 args['resolution'] = self.fixresolution
             args['token'] = self.bztoken
             self.bzproxy.Bug.update(args)
         else:
             if 'fix' in newstate:
                 self.ui.warn(_("Bugzilla/XMLRPC needs Bugzilla 4.0 or later "
                                "to mark bugs fixed\n"))
             args['id'] = bugid
             args['comment'] = text
             self.bzproxy.Bug.add_comment(args)
 
 class bzxmlrpcemail(bzxmlrpc):
     """Read data from Bugzilla via XMLRPC, send updates via email.
 
     Advantages of sending updates via email:
       1. Comments can be added as any user, not just logged in user.
       2. Bug statuses or other fields not accessible via XMLRPC can
          potentially be updated.
 
     There is no XMLRPC function to change bug status before Bugzilla
     4.0, so bugs cannot be marked fixed via XMLRPC before Bugzilla 4.0.
     But bugs can be marked fixed via email from 3.4 onwards.
     """
 
     # The email interface changes subtly between 3.4 and 3.6. In 3.4,
     # in-email fields are specified as '@<fieldname> = <value>'. In
     # 3.6 this becomes '@<fieldname> <value>'. And fieldname @bug_id
     # in 3.4 becomes @id in 3.6. 3.6 and 4.0 both maintain backwards
     # compatibility, but rather than rely on this use the new format for
     # 4.0 onwards.
 
     def __init__(self, ui):
         bzxmlrpc.__init__(self, ui)
 
         self.bzemail = self.ui.config('bugzilla', 'bzemail')
         if not self.bzemail:
             raise error.Abort(_("configuration 'bzemail' missing"))
         mail.validateconfig(self.ui)
 
     def makecommandline(self, fieldname, value):
         if self.bzvermajor >= 4:
             return "@%s %s" % (fieldname, str(value))
         else:
             if fieldname == "id":
                 fieldname = "bug_id"
             return "@%s = %s" % (fieldname, str(value))
 
     def send_bug_modify_email(self, bugid, commands, comment, committer):
         '''send modification message to Bugzilla bug via email.
 
         The message format is documented in the Bugzilla email_in.pl
         specification. commands is a list of command lines, comment is the
         comment text.
 
         To stop users from crafting commit comments with
         Bugzilla commands, specify the bug ID via the message body, rather
         than the subject line, and leave a blank line after it.
         '''
         user = self.map_committer(committer)
         matches = self.bzproxy.User.get({'match': [user],
                                          'token': self.bztoken})
         if not matches['users']:
             user = self.ui.config('bugzilla', 'user', 'bugs')
             matches = self.bzproxy.User.get({'match': [user],
                                              'token': self.bztoken})
             if not matches['users']:
                 raise error.Abort(_("default bugzilla user %s email not found")
                                   % user)
         user = matches['users'][0]['email']
         commands.append(self.makecommandline("id", bugid))
 
         text = "\n".join(commands) + "\n\n" + comment
 
         _charsets = mail._charsets(self.ui)
         user = mail.addressencode(self.ui, user, _charsets)
         bzemail = mail.addressencode(self.ui, self.bzemail, _charsets)
         msg = mail.mimeencode(self.ui, text, _charsets)
         msg['From'] = user
         msg['To'] = bzemail
         msg['Subject'] = mail.headencode(self.ui, "Bug modification", _charsets)
         sendmail = mail.connect(self.ui)
         sendmail(user, bzemail, msg.as_string())
 
     def updatebug(self, bugid, newstate, text, committer):
         cmds = []
         if 'hours' in newstate:
             cmds.append(self.makecommandline("work_time", newstate['hours']))
         if 'fix' in newstate:
             cmds.append(self.makecommandline("bug_status", self.fixstatus))
             cmds.append(self.makecommandline("resolution", self.fixresolution))
         self.send_bug_modify_email(bugid, cmds, text, committer)
 
+class NotFound(LookupError):
+    pass
+
+class bzrestapi(bzaccess):
+    """Read and write bugzilla data using the REST API available since
+    Bugzilla 5.0.
+    """
+    def __init__(self, ui):
+        bzaccess.__init__(self, ui)
+        bz = self.ui.config('bugzilla', 'bzurl',
+                            'http://localhost/bugzilla/')
+        self.bzroot = '/'.join([bz, 'rest'])
+        self.apikey = self.ui.config('bugzilla', 'apikey', '')
+        self.user = self.ui.config('bugzilla', 'user', 'bugs')
+        self.passwd = self.ui.config('bugzilla', 'password')
+        self.fixstatus = self.ui.config('bugzilla', 'fixstatus', 'RESOLVED')
+        self.fixresolution = self.ui.config('bugzilla', 'fixresolution',
+                                            'FIXED')
+
+    def apiurl(self, targets, include_fields=None):
+        url = '/'.join([self.bzroot] + [str(t) for t in targets])
+        qv = {}
+        if self.apikey:
+            qv['api_key'] = self.apikey
+        elif self.user and self.passwd:
+            qv['login'] = self.user
+            qv['password'] = self.passwd
+        if include_fields:
+            qv['include_fields'] = include_fields
+        if qv:
+            url = '%s?%s' % (url, util.urlreq.urlencode(qv))
+        return url
+
+    def _fetch(self, burl):
+        try:
+            resp = url.open(self.ui, burl)
+            return json.loads(resp.read())
+        except util.urlerr.httperror as inst:
+            if inst.code == 401:
+                raise error.Abort(_('authorization failed'))
+            if inst.code == 404:
+                raise NotFound()
+            else:
+                raise
+
+    def _submit(self, burl, data, method='POST'):
+        data = json.dumps(data)
+        if method == 'PUT':
+            class putrequest(util.urlreq.request):
+                def get_method(self):
+                    return 'PUT'
+            request_type = putrequest
+        else:
+            request_type = util.urlreq.request
+        req = request_type(burl, data,
+                           {'Content-Type': 'application/json'})
+        try:
+            resp = url.opener(self.ui).open(req)
+            return json.loads(resp.read())
+        except util.urlerr.httperror as inst:
+            if inst.code == 401:
+                raise error.Abort(_('authorization failed'))
+            if inst.code == 404:
+                raise NotFound()
+            else:
+                raise
+
+    def filter_real_bug_ids(self, bugs):
+        '''remove bug IDs that do not exist in Bugzilla from bugs.'''
+        badbugs = set()
+        for bugid in bugs:
+            burl = self.apiurl(('bug', bugid), include_fields='status')
+            try:
+                self._fetch(burl)
+            except NotFound:
+                badbugs.add(bugid)
+        for bugid in badbugs:
+            del bugs[bugid]
+
+    def filter_cset_known_bug_ids(self, node, bugs):
+        '''remove bug IDs where node occurs in comment text from bugs.'''
+        sn = short(node)
+        for bugid in bugs.keys():
+            burl = self.apiurl(('bug', bugid, 'comment'), include_fields='text')
+            result = self._fetch(burl)
+            comments = result['bugs'][str(bugid)]['comments']
+            if any(sn in c['text'] for c in comments):
+                self.ui.status(_('bug %d already knows about changeset %s\n') %
+                               (bugid, sn))
+                del bugs[bugid]
+
+    def updatebug(self, bugid, newstate, text, committer):
+        '''update the specified bug. Add comment text and set new states.
+
+        If possible add the comment as being from the committer of
+        the changeset. Otherwise use the default Bugzilla user.
+        '''
+        bugmod = {}
+        if 'hours' in newstate:
+            bugmod['work_time'] = newstate['hours']
+        if 'fix' in newstate:
+            bugmod['status'] = self.fixstatus
+            bugmod['resolution'] = self.fixresolution
+        if bugmod:
+            # if we have to change the bugs state do it here
+            bugmod['comment'] = {
+                'comment': text,
+                'is_private': False,
+                'is_markdown': False,
+            }
+            burl = self.apiurl(('bug', bugid))
+            self._submit(burl, bugmod, method='PUT')
+            self.ui.debug('updated bug %s\n' % bugid)
+        else:
+            burl = self.apiurl(('bug', bugid, 'comment'))
+            self._submit(burl, {
+                'comment': text,
+                'is_private': False,
+                'is_markdown': False,
+            })
+            self.ui.debug('added comment to bug %s\n' % bugid)
+
+    def notify(self, bugs, committer):
+        '''Force sending of Bugzilla notification emails.
+
+        Only required if the access method does not trigger notification
+        emails automatically.
+        '''
+        pass
+
 class bugzilla(object):
     # supported versions of bugzilla. different versions have
     # different schemas.
     _versions = {
         '2.16': bzmysql,
         '2.18': bzmysql_2_18,
         '3.0':  bzmysql_3_0,
         'xmlrpc': bzxmlrpc,
-        'xmlrpc+email': bzxmlrpcemail
+        'xmlrpc+email': bzxmlrpcemail,
+        'restapi': bzrestapi,
         }
 
     _default_bug_re = (r'bugs?\s*,?\s*(?:#|nos?\.?|num(?:ber)?s?)?\s*'
                        r'(?P<ids>(?:\d+\s*(?:,?\s*(?:and)?)?\s*)+)'
                        r'\.?\s*(?:h(?:ours?)?\s*(?P<hours>\d*(?:\.\d+)?))?')
 
     _default_fix_re = (r'fix(?:es)?\s*(?:bugs?\s*)?,?\s*'
                        r'(?:nos?\.?|num(?:ber)?s?)?\s*'
                        r'(?P<ids>(?:#?\d+\s*(?:,?\s*(?:and)?)?\s*)+)'
                        r'\.?\s*(?:h(?:ours?)?\s*(?P<hours>\d*(?:\.\d+)?))?')
 
     def __init__(self, ui, repo):
         self.ui = ui
         self.repo = repo
 
         bzversion = self.ui.config('bugzilla', 'version')
         try:
             bzclass = bugzilla._versions[bzversion]
         except KeyError:
             raise error.Abort(_('bugzilla version %s not supported') %
                              bzversion)
         self.bzdriver = bzclass(self.ui)
 
         self.bug_re = re.compile(
             self.ui.config('bugzilla', 'regexp',
                            bugzilla._default_bug_re), re.IGNORECASE)
         self.fix_re = re.compile(
             self.ui.config('bugzilla', 'fixregexp',
                            bugzilla._default_fix_re), re.IGNORECASE)
         self.split_re = re.compile(r'\D+')
 
     def find_bugs(self, ctx):
         '''return bugs dictionary created from commit comment.
 
         Extract bug info from changeset comments. Filter out any that are
         not known to Bugzilla, and any that already have a reference to
         the given changeset in their comments.
         '''
         start = 0
         hours = 0.0
         bugs = {}
         bugmatch = self.bug_re.search(ctx.description(), start)
         fixmatch = self.fix_re.search(ctx.description(), start)
         while True:
             bugattribs = {}
             if not bugmatch and not fixmatch:
                 break
             if not bugmatch:
                 m = fixmatch
             elif not fixmatch:
                 m = bugmatch
             else:
                 if bugmatch.start() < fixmatch.start():
                     m = bugmatch
                 else:
                     m = fixmatch
             start = m.end()
             if m is bugmatch:
                 bugmatch = self.bug_re.search(ctx.description(), start)
                 if 'fix' in bugattribs:
                     del bugattribs['fix']
             else:
                 fixmatch = self.fix_re.search(ctx.description(), start)
                 bugattribs['fix'] = None
 
             try:
                 ids = m.group('ids')
             except IndexError:
                 ids = m.group(1)
             try:
                 hours = float(m.group('hours'))
                 bugattribs['hours'] = hours
             except IndexError:
                 pass
             except TypeError:
                 pass
             except ValueError:
                 self.ui.status(_("%s: invalid hours\n") % m.group('hours'))
 
             for id in self.split_re.split(ids):
                 if not id:
                     continue
                 bugs[int(id)] = bugattribs
         if bugs:
             self.bzdriver.filter_real_bug_ids(bugs)
         if bugs:
             self.bzdriver.filter_cset_known_bug_ids(ctx.node(), bugs)
         return bugs
 
     def update(self, bugid, newstate, ctx):
         '''update bugzilla bug with reference to changeset.'''
 
         def webroot(root):
             '''strip leading prefix of repo root and turn into
             url-safe path.'''
             count = int(self.ui.config('bugzilla', 'strip', 0))
             root = util.pconvert(root)
             while count > 0:
                 c = root.find('/')
                 if c == -1:
                     break
                 root = root[c + 1:]
                 count -= 1
             return root
 
         mapfile = None
         tmpl = self.ui.config('bugzilla', 'template')
         if not tmpl:
             mapfile = self.ui.config('bugzilla', 'style')
         if not mapfile and not tmpl:
             tmpl = _('changeset {node|short} in repo {root} refers '
                      'to bug {bug}.\ndetails:\n\t{desc|tabindent}')
         t = cmdutil.changeset_templater(self.ui, self.repo,
                                         False, None, tmpl, mapfile, False)
         self.ui.pushbuffer()
         t.show(ctx, changes=ctx.changeset(),
                bug=str(bugid),
                hgweb=self.ui.config('web', 'baseurl'),
                root=self.repo.root,
                webroot=webroot(self.repo.root))
         data = self.ui.popbuffer()
         self.bzdriver.updatebug(bugid, newstate, data, util.email(ctx.user()))
 
     def notify(self, bugs, committer):
         '''ensure Bugzilla users are notified of bug change.'''
         self.bzdriver.notify(bugs, committer)
 
 def hook(ui, repo, hooktype, node=None, **kwargs):
     '''add comment to bugzilla for each changeset that refers to a
     bugzilla bug id. only add a comment once per bug, so same change
     seen multiple times does not fill bug with duplicate data.'''
     if node is None:
         raise error.Abort(_('hook type %s does not pass a changeset id') %
                          hooktype)
     try:
         bz = bugzilla(ui, repo)
         ctx = repo[node]
         bugs = bz.find_bugs(ctx)
         if bugs:
             for bug in bugs:
                 bz.update(bug, bugs[bug], ctx)
             bz.notify(bugs, util.email(ctx.user()))
     except Exception as e:
         raise error.Abort(_('Bugzilla error: %s') % e)