thirdparty/google_appengine/google/appengine/api/appinfo.py
author Lennard de Rijk <ljvderijk@gmail.com>
Wed, 21 Jan 2009 14:57:12 +0000
changeset 868 8d3c1ee6eba7
parent 828 f5fd65cc3bf3
child 1278 a7766286a7be
permissions -rwxr-xr-x
onCreate for a Club now marks any application for the same club as completed and invites the admins. This is useful for when the club has been created without using the application. Patch by: Lennard de Rijk
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#!/usr/bin/env python
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#
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# Copyright 2007 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#     http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""AppInfo tools
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Library for working with AppInfo records in memory, store and load from
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configuration files.
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"""
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import re
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from google.appengine.api import appinfo_errors
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from google.appengine.api import validation
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from google.appengine.api import yaml_listener
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from google.appengine.api import yaml_builder
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from google.appengine.api import yaml_object
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_URL_REGEX = r'(?!\^)/|\.|(\(.).*(?!\$).'
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_FILES_REGEX = r'(?!\^).*(?!\$).'
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_DELTA_REGEX = r'([1-9][0-9]*)([DdHhMm]|[sS]?)'
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_EXPIRATION_REGEX = r'\s*(%s)(\s+%s)*\s*' % (_DELTA_REGEX, _DELTA_REGEX)
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_EXPIRATION_CONVERSIONS = {
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  'd': 60 * 60 * 24,
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  'h': 60 * 60,
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  'm': 60,
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  's': 1,
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}
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APP_ID_MAX_LEN = 100
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MAJOR_VERSION_ID_MAX_LEN = 100
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MAX_URL_MAPS = 100
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APPLICATION_RE_STRING = r'(?!-)[a-z\d\-]{1,%d}' % APP_ID_MAX_LEN
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VERSION_RE_STRING = r'(?!-)[a-z\d\-]{1,%d}' % MAJOR_VERSION_ID_MAX_LEN
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RUNTIME_RE_STRING = r'[a-z]{1,30}'
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HANDLER_STATIC_FILES = 'static_files'
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HANDLER_STATIC_DIR = 'static_dir'
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HANDLER_SCRIPT = 'script'
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LOGIN_OPTIONAL = 'optional'
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LOGIN_REQUIRED = 'required'
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LOGIN_ADMIN = 'admin'
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SECURE_HTTP = 'never'
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SECURE_HTTPS = 'always'
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SECURE_HTTP_OR_HTTPS = 'optional'
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DEFAULT_SKIP_FILES = (r"^(.*/)?("
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                      r"(app\.yaml)|"
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                      r"(app\.yml)|"
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                      r"(index\.yaml)|"
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                      r"(index\.yml)|"
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                      r"(#.*#)|"
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                      r"(.*~)|"
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                      r"(.*\.py[co])|"
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                      r"(.*/RCS/.*)|"
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                      r"(\..*)|"
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                      r")$")
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LOGIN = 'login'
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SECURE = 'secure'
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URL = 'url'
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STATIC_FILES = 'static_files'
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UPLOAD = 'upload'
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STATIC_DIR = 'static_dir'
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MIME_TYPE = 'mime_type'
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SCRIPT = 'script'
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EXPIRATION = 'expiration'
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APPLICATION = 'application'
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VERSION = 'version'
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RUNTIME = 'runtime'
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API_VERSION = 'api_version'
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HANDLERS = 'handlers'
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DEFAULT_EXPIRATION = 'default_expiration'
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SKIP_FILES = 'skip_files'
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class URLMap(validation.Validated):
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  """Mapping from URLs to handlers.
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  This class acts like something of a union type.  Its purpose is to
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  describe a mapping between a set of URLs and their handlers.  What
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  handler type a given instance has is determined by which handler-id
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  attribute is used.
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  Each mapping can have one and only one handler type.  Attempting to
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  use more than one handler-id attribute will cause an UnknownHandlerType
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  to be raised during validation.  Failure to provide any handler-id
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  attributes will cause MissingHandlerType to be raised during validation.
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  The regular expression used by the url field will be used to match against
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  the entire URL path and query string of the request.  This means that
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  partial maps will not be matched.  Specifying a url, say /admin, is the
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  same as matching against the regular expression '^/admin$'.  Don't begin
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  your matching url with ^ or end them with $.  These regular expressions
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  won't be accepted and will raise ValueError.
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  Attributes:
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    login: Whether or not login is required to access URL.  Defaults to
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      'optional'.
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    secure: Restriction on the protocol which can be used to serve
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            this URL/handler (HTTP, HTTPS or either).
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    url: Regular expression used to fully match against the request URLs path.
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      See Special Cases for using static_dir.
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    static_files: Handler id attribute that maps URL to the appropriate
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      file.  Can use back regex references to the string matched to url.
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    upload: Regular expression used by the application configuration
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      program to know which files are uploaded as blobs.  It's very
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      difficult to determine this using just the url and static_files
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      so this attribute must be included.  Required when defining a
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      static_files mapping.
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      A matching file name must fully match against the upload regex, similar
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      to how url is matched against the request path.  Do not begin upload
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      with ^ or end it with $.
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    static_dir: Handler id that maps the provided url to a sub-directory
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      within the application directory.  See Special Cases.
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    mime_type: When used with static_files and static_dir the mime-type
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      of files served from those directories are overridden with this
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      value.
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    script: Handler id that maps URLs to scipt handler within the application
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      directory that will run using CGI.
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    expiration: When used with static files and directories, the time delta to
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      use for cache expiration. Has the form '4d 5h 30m 15s', where each letter
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      signifies days, hours, minutes, and seconds, respectively. The 's' for
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      seconds may be omitted. Only one amount must be specified, combining
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      multiple amounts is optional. Example good values: '10', '1d 6h',
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      '1h 30m', '7d 7d 7d', '5m 30'.
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  Special cases:
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    When defining a static_dir handler, do not use a regular expression
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    in the url attribute.  Both the url and static_dir attributes are
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    automatically mapped to these equivalents:
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      <url>/(.*)
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      <static_dir>/\1
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    For example:
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      url: /images
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      static_dir: images_folder
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    Is the same as this static_files declaration:
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      url: /images/(.*)
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      static_files: images/\1
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      upload: images/(.*)
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  """
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  ATTRIBUTES = {
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    URL: validation.Optional(_URL_REGEX),
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    LOGIN: validation.Options(LOGIN_OPTIONAL,
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                              LOGIN_REQUIRED,
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                              LOGIN_ADMIN,
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                              default=LOGIN_OPTIONAL),
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    SECURE: validation.Options(SECURE_HTTP,
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                               SECURE_HTTPS,
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                               SECURE_HTTP_OR_HTTPS,
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                               default=SECURE_HTTP),
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109
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    HANDLER_STATIC_FILES: validation.Optional(_FILES_REGEX),
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    UPLOAD: validation.Optional(_FILES_REGEX),
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    HANDLER_STATIC_DIR: validation.Optional(_FILES_REGEX),
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    MIME_TYPE: validation.Optional(str),
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    EXPIRATION: validation.Optional(_EXPIRATION_REGEX),
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    HANDLER_SCRIPT: validation.Optional(_FILES_REGEX),
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  }
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  COMMON_FIELDS = set([URL, LOGIN, SECURE])
109
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  ALLOWED_FIELDS = {
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    HANDLER_STATIC_FILES: (MIME_TYPE, UPLOAD, EXPIRATION),
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    HANDLER_STATIC_DIR: (MIME_TYPE, EXPIRATION),
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    HANDLER_SCRIPT: (),
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  }
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  def GetHandler(self):
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    """Get handler for mapping.
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    Returns:
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      Value of the handler (determined by handler id attribute).
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    """
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    return getattr(self, self.GetHandlerType())
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  def GetHandlerType(self):
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    """Get handler type of mapping.
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    Returns:
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      Handler type determined by which handler id attribute is set.
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    Raises:
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      UnknownHandlerType when none of the no handler id attributes
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      are set.
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      UnexpectedHandlerAttribute when an unexpected attribute
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      is set for the discovered handler type.
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      HandlerTypeMissingAttribute when the handler is missing a
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      required attribute for its handler type.
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    """
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    for id_field in URLMap.ALLOWED_FIELDS.iterkeys():
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      if getattr(self, id_field) is not None:
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        mapping_type = id_field
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        break
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    else:
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      raise appinfo_errors.UnknownHandlerType(
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          'Unknown url handler type.\n%s' % str(self))
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    allowed_fields = URLMap.ALLOWED_FIELDS[mapping_type]
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    for attribute in self.ATTRIBUTES.iterkeys():
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      if (getattr(self, attribute) is not None and
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          not (attribute in allowed_fields or
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               attribute in URLMap.COMMON_FIELDS or
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               attribute == mapping_type)):
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            raise appinfo_errors.UnexpectedHandlerAttribute(
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                'Unexpected attribute "%s" for mapping type %s.' %
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                (attribute, mapping_type))
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    if mapping_type == HANDLER_STATIC_FILES and not self.upload:
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      raise appinfo_errors.MissingHandlerAttribute(
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          'Missing "%s" attribute for URL "%s".' % (UPLOAD, self.url))
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    return mapping_type
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  def CheckInitialized(self):
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    """Adds additional checking to make sure handler has correct fields.
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    In addition to normal ValidatedCheck calls GetHandlerType
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    which validates all the handler fields are configured
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    properly.
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    Raises:
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      UnknownHandlerType when none of the no handler id attributes
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      are set.
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      UnexpectedHandlerAttribute when an unexpected attribute
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      is set for the discovered handler type.
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      HandlerTypeMissingAttribute when the handler is missing a
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      required attribute for its handler type.
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    """
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    super(URLMap, self).CheckInitialized()
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    self.GetHandlerType()
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class AppInfoExternal(validation.Validated):
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  """Class representing users application info.
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  This class is passed to a yaml_object builder to provide the validation
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  for the application information file format parser.
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  Attributes:
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    application: Unique identifier for application.
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    version: Application's major version number.
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    runtime: Runtime used by application.
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    api_version: Which version of APIs to use.
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    handlers: List of URL handlers.
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    default_expiration: Default time delta to use for cache expiration for
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      all static files, unless they have their own specific 'expiration' set.
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      See the URLMap.expiration field's documentation for more information.
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    skip_files: An re object.  Files that match this regular expression will
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      not be uploaded by appcfg.py.  For example:
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        skip_files: |
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          .svn.*|
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          #.*#
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  """
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  ATTRIBUTES = {
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    APPLICATION: APPLICATION_RE_STRING,
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    VERSION: VERSION_RE_STRING,
828
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    RUNTIME: RUNTIME_RE_STRING,
109
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    API_VERSION: validation.Options('1', 'beta'),
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    HANDLERS: validation.Optional(validation.Repeated(URLMap)),
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    DEFAULT_EXPIRATION: validation.Optional(_EXPIRATION_REGEX),
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    SKIP_FILES: validation.RegexStr(default=DEFAULT_SKIP_FILES)
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  }
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  def CheckInitialized(self):
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    """Ensures that at least one url mapping is provided.
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    Raises:
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      MissingURLMapping when no URLMap objects are present in object.
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      TooManyURLMappings when there are too many URLMap entries.
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    """
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    super(AppInfoExternal, self).CheckInitialized()
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    if not self.handlers:
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      raise appinfo_errors.MissingURLMapping(
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          'No URLMap entries found in application configuration')
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    if len(self.handlers) > MAX_URL_MAPS:
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      raise appinfo_errors.TooManyURLMappings(
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          'Found more than %d URLMap entries in application configuration' %
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          MAX_URL_MAPS)
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def LoadSingleAppInfo(app_info):
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  """Load a single AppInfo object where one and only one is expected.
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  Args:
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    app_info: A file-like object or string.  If it is a string, parse it as
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    a configuration file.  If it is a file-like object, read in data and
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    parse.
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  Returns:
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    An instance of AppInfoExternal as loaded from a YAML file.
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  Raises:
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    EmptyConfigurationFile when there are no documents in YAML file.
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    MultipleConfigurationFile when there is more than one document in YAML
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    file.
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  """
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  builder = yaml_object.ObjectBuilder(AppInfoExternal)
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  handler = yaml_builder.BuilderHandler(builder)
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  listener = yaml_listener.EventListener(handler)
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  listener.Parse(app_info)
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  app_infos = handler.GetResults()
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  if len(app_infos) < 1:
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    raise appinfo_errors.EmptyConfigurationFile()
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  if len(app_infos) > 1:
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    raise appinfo_errors.MultipleConfigurationFile()
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  return app_infos[0]
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def ParseExpiration(expiration):
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  """Parses an expiration delta string.
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  Args:
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    expiration: String that matches _DELTA_REGEX.
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  Returns:
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    Time delta in seconds.
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  """
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  delta = 0
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  for match in re.finditer(_DELTA_REGEX, expiration):
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    amount = int(match.group(1))
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    units = _EXPIRATION_CONVERSIONS.get(match.group(2).lower(), 1)
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    delta += amount * units
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  return delta
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   378
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diff changeset
   379
109
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   380
_file_path_positive_re = re.compile(r'^[ 0-9a-zA-Z\._\+/\$-]{1,256}$')
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   381
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_file_path_negative_1_re = re.compile(r'\.\.|^\./|\.$|/\./|^-')
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   383
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   384
_file_path_negative_2_re = re.compile(r'//|/$')
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   385
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   386
_file_path_negative_3_re = re.compile(r'^ | $|/ | /')
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   387
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   388
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def ValidFilename(filename):
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   390
  """Determines if filename is valid.
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   391
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   392
  filename must be a valid pathname.
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   393
  - It must contain only letters, numbers, _, +, /, $, ., and -.
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   394
  - It must be less than 256 chars.
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   395
  - It must not contain "/./", "/../", or "//".
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parents:
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   396
  - It must not end in "/".
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   397
  - All spaces must be in the middle of a directory or file name.
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   398
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   399
  Args:
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   400
    filename: The filename to validate.
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   401
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   402
  Returns:
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   403
    An error string if the filename is invalid.  Returns '' if the filename
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   404
    is valid.
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   405
  """
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   406
  if _file_path_positive_re.match(filename) is None:
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   407
    return 'Invalid character in filename: %s' % filename
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   408
  if _file_path_negative_1_re.search(filename) is not None:
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   409
    return ('Filename cannot contain "." or ".." or start with "-": %s' %
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   410
            filename)
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   411
  if _file_path_negative_2_re.search(filename) is not None:
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   412
    return 'Filename cannot have trailing / or contain //: %s' % filename
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   413
  if _file_path_negative_3_re.search(filename) is not None:
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   414
    return 'Any spaces must be in the middle of a filename: %s' % filename
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   415
  return ''