def validate_new_content(self, base_revision, new_body, user):
        # check metadata
        new_md = PageOperationMixin.parse_metadata(new_body)

        ## prevent self-revoke
        acl_r = new_md.get('read', '')
        acl_r = acl_r.split(',') if acl_r else []
        acl_w = new_md.get('write', '')
        acl_w = acl_w.split(',') if acl_w else []

        if not self.can_read(user, acl_r=acl_r, acl_w=acl_w):
            raise ValueError('Cannot restrict your permission')
        if not self.can_write(user, acl_r=acl_r, acl_w=acl_w):
            raise ValueError('Cannot restrict your permission')

        ## prevent circular-redirection
        try:
            WikiPage._follow_redirect(self, new_md.get(u'redirect'))
        except ValueError as e:
            raise e

        # check data
        new_data = PageOperationMixin.parse_data(self.title, new_body, new_md['schema'])
        if any(type(value) == schema.InvalidProperty for value in new_data.values()):
            raise ValueError('Invalid schema data')

        # check revision
        if self.revision < base_revision:
            raise ValueError('Invalid revision number: %d' % base_revision)

        # check headings
        if not TocGenerator(md.convert(new_body)).validate():
            raise ValueError("Duplicate paths not allowed")

        return new_data, new_md

    def get_preview_instance(self, preview_body):
        page = PageOperationMixin()

        page.body = preview_body
        page.title = self.title
        page.revision = self.revision
        page.inlinks = self.inlinks
        page.outlinks = self.outlinks
        page.related_links = self.related_links
        page.older_title = self.older_title
        page.newer_title = self.newer_title
        page.updated_at = self.updated_at

        return page

 def test_normal(self):
     expected = {
         u'hello': u'a b c',
         u'x': None,
         u'z': u'what?',
     }
     expected.update(self.default_md)
     actual = PageOperationMixin.parse_metadata(u'.hello a b c\n.x\n.z what?\nblahblah')
     self.assertEqual(expected, actual)

    def _update_content_all(self, body, base_revision, comment, user, force_update, dont_create_rev, dont_defer):
        # do not update if the body is not changed
        if not force_update and self.body == body:
            return False

        # validate and prepare new contents
        new_data, new_md = self.validate_new_content(base_revision, body, user)
        new_body = self._merge_if_needed(base_revision, body)

        # get old data and metadata
        old_md = self.metadata.copy()
        old_data = self.data.copy()

        # delete caches
        caching.del_rendered_body(self.title)
        caching.del_hashbangs(self.title)
        caching.del_metadata(self.title)
        caching.del_data(self.title)

        # update model and save
        self.body = new_body
        self.modifier = user
        self.description = PageOperationMixin.make_description(new_body)
        self.acl_read = new_md.get('read', '')
        self.acl_write = new_md.get('write', '')
        self.comment = comment
        self.itemtype_path = schema.get_itemtype_path(new_md['schema'])
        self._update_pub_state(new_md, old_md)
        if not dont_create_rev:
            self.revision += 1
        if not force_update:
            self.updated_at = datetime.now()
        self.put()

        # create revision
        if not dont_create_rev:
            rev_key = self._rev_key()
            rev = WikiPageRevision(parent=rev_key, title=self.title, body=self.body,
                                   created_at=self.updated_at, revision=self.revision,
                                   comment=self.comment, modifier=self.modifier,
                                   acl_read=self.acl_read, acl_write=self.acl_write)
            rev.put()

        # update inlinks, outlinks and schema data index
        self.update_links_and_data(old_md.get('redirect'), new_md.get('redirect'), old_data, new_data, dont_defer)

        # delete config cache
        if self.title == '.config':
            caching.del_config()

        # delete title cache if it's a new page
        if self.revision == 1:
            caching.del_titles()

        return True

    def get_config(cls):
        result = caching.get_config()
        if result is None:
            result = main.DEFAULT_CONFIG

            try:
                config_page = cls.get_by_title('.config')
                user_config = yaml.load(PageOperationMixin.remove_metadata(config_page.body))
            except:
                user_config = None
            user_config = user_config or {}

            def merge_dict(target_dict, source_dict):
                for (key, value) in source_dict.iteritems():
                    if type(value) != dict:
                        target_dict[key] = value
                    else:
                        merge_dict(target_dict.setdefault(key, {}), value)

            merge_dict(result, user_config)

            caching.set_config(result)
        return result

 def test_default_section(self):
     data = PageOperationMixin.parse_sections(u'Hello')
     self.assertEqual({'articleBody'}, set(data.keys()))
     self.assertEqual(u'Hello', data['articleBody'])

 def test_should_ignore_yaml_schema_block(self):
     self.assertEqual(u'Hello',
                      PageOperationMixin.make_description(u'.schema Book\n    #!yaml/schema\n    author: A\n\nHello', 20))

 def test_should_ignore_metadata(self):
     self.assertEqual(u'Hello',
                      PageOperationMixin.make_description(u'.pub\n\nHello', 20))

 def test_tab_and_space_mixed(self):
     body = u'\t#!yaml/schema\n    alternateName: hi\n\turl: http://x.com\n    name: "Hello"\n'
     data = PageOperationMixin.parse_schema_yaml(body)
     self.assertEqual(data['name'], u'Hello')
     self.assertEqual(data['alternateName'], u'hi')
     self.assertEqual(data['url'], u'http://x.com')

 def test_multiple_authors(self):
     data = PageOperationMixin.parse_data(u'Hello', u'[[author::AK]] and [[author::TK]]', u'Book')
     self.assertEqual([u'AK', u'TK'], [v.pvalue for v in data['author']])

 def test_no_data(self):
     data = PageOperationMixin.parse_data(u'Hello', u'Hello')
     self.assertEqual(['articleBody', 'name', 'schema'], data.keys())
     self.assertEqual(u'Hello', data['name'].pvalue)
     self.assertEqual(u'Thing/CreativeWork/Article/', data['schema'].pvalue)
     self.assertEqual(u'Hello', data['articleBody'].pvalue)

 def test_empty_string(self):
     expected = {}
     expected.update(self.default_md)
     actual = PageOperationMixin.parse_metadata(u'')
     self.assertEqual(expected, actual)

 def test_no_schema(self):
     self.assertEqual({}, PageOperationMixin.parse_schema_yaml(u'Hello'))

 def absolute_url(self):
     return u'/%s?rev=%d' % (PageOperationMixin.title_to_path(self.title), int(self.revision))

 def test_specifying_default_section(self):
     data = PageOperationMixin.parse_sections(u'Hello', u'longText')
     self.assertEqual({'longText'}, set(data.keys()))
     self.assertEqual(u'Hello', data['longText'])

 def test_additional_sections(self):
     data = PageOperationMixin.parse_sections(u'Hello\n\nsection1::---\n\nHello\n\nthere\n\nsection2::---\n\nGood\n\nbye\n')
     self.assertEqual({'articleBody', 'section1', 'section2'}, set(data.keys()))
     self.assertEqual(u'Hello', data['articleBody'])
     self.assertEqual(u'Hello\n\nthere', data['section1'])
     self.assertEqual(u'Good\n\nbye', data['section2'])

 def test_no_metadata(self):
     expected = {}
     expected.update(self.default_md)
     actual = PageOperationMixin.parse_metadata(u'Hello\nThere')
     self.assertEqual(expected, actual)

 def test_author_and_isbn(self):
     data = PageOperationMixin.parse_data(u'Hello', u'[[author::AK]]\n{{isbn::1234567890}}', u'Book')
     self.assertEqual(u'AK', data['author'].pvalue)
     self.assertEqual(u'1234567890', data['isbn'].pvalue)

 def test_try_newline(self):
     self.assertEqual(u'Hello', PageOperationMixin.make_description(u'Hello\nWorld', 20))

 def test_re_match(self):
     body = u'''\t#!yaml/schema\n    url: "http://anotherfam.kr/"\n\n\n[[\uc81c\uc791\ub450\ub808]]\ub97c ...\n'''
     data = PageOperationMixin.parse_schema_yaml(body)
     self.assertEqual(data['url'], 'http://anotherfam.kr/')