Add google-endpoints to third_party/.

third_party/google-endpoints/endpoints/endpointscfg.py

Index: third_party/google-endpoints/endpoints/endpointscfg.py
diff --git a/third_party/google-endpoints/endpoints/endpointscfg.py b/third_party/google-endpoints/endpoints/endpointscfg.py
new file mode 100644
index 0000000000000000000000000000000000000000..465e020fa4cae78f46773c8c77a1377b5b95f366
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+++ b/third_party/google-endpoints/endpoints/endpointscfg.py
@@ -0,0 +1,625 @@
+#!/usr/bin/python
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+r"""External script for generating Cloud Endpoints related files.
+
+The gen_discovery_doc subcommand takes a list of fully qualified ProtoRPC
+service names and calls a cloud service which generates a discovery document in
+REST or RPC style.
+
+Example:
+  endpointscfg.py gen_discovery_doc -o . -f rest postservice.GreetingsV1
+
+The gen_client_lib subcommand takes a discovery document and calls a cloud
+service to generate a client library for a target language (currently just Java)
+
+Example:
+  endpointscfg.py gen_client_lib java -o . greetings-v0.1.discovery
+
+The get_client_lib subcommand does both of the above commands at once.
+
+Example:
+  endpointscfg.py get_client_lib java -o . postservice.GreetingsV1
+
+The gen_api_config command outputs an .api configuration file for a service.
+
+Example:
+  endpointscfg.py gen_api_config -o . -a /path/to/app \
+    --hostname myhost.appspot.com postservice.GreetingsV1
+"""
+
+from __future__ import with_statement
+
+import argparse
+import collections
+import contextlib
+# Conditional import, pylint: disable=g-import-not-at-top
+try:
+  import json
+except ImportError:
+  # If we can't find json packaged with Python import simplejson, which is
+  # packaged with the SDK.
+  import simplejson as json
+import os
+import re
+import sys
+import urllib
+import urllib2
+import _endpointscfg_setup  # pylint: disable=unused-import
+import api_config
+from protorpc import remote
+import openapi_generator
+import yaml
+
+from google.appengine.ext import testbed
+
+DISCOVERY_DOC_BASE = ('https://webapis-discovery.appspot.com/_ah/api/'
+                      'discovery/v1/apis/generate/')
+CLIENT_LIBRARY_BASE = 'https://google-api-client-libraries.appspot.com/generate'
+_VISIBLE_COMMANDS = ('get_client_lib', 'get_discovery_doc', 'get_openapi_spec')
+
+
+class ServerRequestException(Exception):
+  """Exception for problems with the request to a server."""
+
+  def __init__(self, http_error):
+    """Create a ServerRequestException from a given urllib2.HTTPError.
+
+    Args:
+      http_error: The HTTPError that the ServerRequestException will be
+        based on.
+    """
+    error_details = None
+    error_response = None
+    if http_error.fp:
+      try:
+        error_response = http_error.fp.read()
+        error_body = json.loads(error_response)
+        error_details = ['%s: %s' % (detail['message'], detail['debug_info'])
+                         for detail in error_body['error']['errors']]
+      except (ValueError, TypeError, KeyError):
+        pass
+    if error_details:
+      error_details_str = ', '.join(error_details)
+      error_message = ('HTTP %s (%s) error when communicating with URL: %s.  '
+                       'Details: %s' % (http_error.code, http_error.reason,
+                                        http_error.filename, error_details_str))
+    else:
+      error_message = ('HTTP %s (%s) error when communicating with URL: %s. '
+                       'Response: %s' % (http_error.code, http_error.reason,
+                                         http_error.filename,
+                                         error_response))
+    super(ServerRequestException, self).__init__(error_message)
+
+
+class _EndpointsParser(argparse.ArgumentParser):
+  """Create a subclass of argparse.ArgumentParser for Endpoints."""
+
+  def error(self, message):
+    """Override superclass to support customized error message.
+
+    Error message needs to be rewritten in order to display visible commands
+    only, when invalid command is called by user. Otherwise, hidden commands
+    will be displayed in stderr, which is not expected.
+
+    Refer the following argparse python documentation for detailed method
+    information:
+      http://docs.python.org/2/library/argparse.html#exiting-methods
+
+    Args:
+      message: original error message that will be printed to stderr
+    """
+    # subcommands_quoted is the same as subcommands, except each value is
+    # surrounded with double quotes. This is done to match the standard
+    # output of the ArgumentParser, while hiding commands we don't want users
+    # to use, as they are no longer documented and only here for legacy use.
+    subcommands_quoted = ', '.join(
+        [repr(command) for command in _VISIBLE_COMMANDS])
+    subcommands = ', '.join(_VISIBLE_COMMANDS)
+    message = re.sub(
+        r'(argument {%s}: invalid choice: .*) \(choose from (.*)\)$'
+        % subcommands, r'\1 (choose from %s)' % subcommands_quoted, message)
+    super(_EndpointsParser, self).error(message)
+
+
+def _WriteFile(output_path, name, content):
+  """Write given content to a file in a given directory.
+
+  Args:
+    output_path: The directory to store the file in.
+    name: The name of the file to store the content in.
+    content: The content to write to the file.close
+
+  Returns:
+    The full path to the written file.
+  """
+  path = os.path.join(output_path, name)
+  with open(path, 'wb') as f:
+    f.write(content)
+  return path
+
+
+def GenApiConfig(service_class_names, config_string_generator=None,
+                 hostname=None, application_path=None):
+  """Write an API configuration for endpoints annotated ProtoRPC services.
+
+  Args:
+    service_class_names: A list of fully qualified ProtoRPC service classes.
+    config_string_generator: A generator object that produces API config strings
+      using its pretty_print_config_to_json method.
+    hostname: A string hostname which will be used as the default version
+      hostname. If no hostname is specificied in the @endpoints.api decorator,
+      this value is the fallback.
+    application_path: A string with the path to the AppEngine application.
+
+  Raises:
+    TypeError: If any service classes don't inherit from remote.Service.
+    messages.DefinitionNotFoundError: If a service can't be found.
+
+  Returns:
+    A map from service names to a string containing the API configuration of the
+      service in JSON format.
+  """
+  # First, gather together all the different APIs implemented by these
+  # classes.  There may be fewer APIs than service classes.  Each API is
+  # uniquely identified by (name, version).  Order needs to be preserved here,
+  # so APIs that were listed first are returned first.
+  api_service_map = collections.OrderedDict()
+  for service_class_name in service_class_names:
+    module_name, base_service_class_name = service_class_name.rsplit('.', 1)
+    module = __import__(module_name, fromlist=base_service_class_name)
+    service = getattr(module, base_service_class_name)
+    if not isinstance(service, type) or not issubclass(service, remote.Service):
+      raise TypeError('%s is not a ProtoRPC service' % service_class_name)
+
+    services = api_service_map.setdefault(
+        (service.api_info.name, service.api_info.version), [])
+    services.append(service)
+
+  # If hostname isn't specified in the API or on the command line, we'll
+  # try to build it from information in app.yaml.
+  app_yaml_hostname = _GetAppYamlHostname(application_path)
+
+  service_map = collections.OrderedDict()
+  config_string_generator = (
+      config_string_generator or api_config.ApiConfigGenerator())
+  for api_info, services in api_service_map.iteritems():
+    assert services, 'An API must have at least one ProtoRPC service'
+    # Only override hostname if None.  Hostname will be the same for all
+    # services within an API, since it's stored in common info.
+    hostname = services[0].api_info.hostname or hostname or app_yaml_hostname
+
+    # Map each API by name-version.
+    service_map['%s-%s' % api_info] = (
+        config_string_generator.pretty_print_config_to_json(
+            services, hostname=hostname))
+
+  return service_map
+
+
+def _GetAppYamlHostname(application_path, open_func=open):
+  """Build the hostname for this app based on the name in app.yaml.
+
+  Args:
+    application_path: A string with the path to the AppEngine application.  This
+      should be the directory containing the app.yaml file.
+    open_func: Function to call to open a file.  Used to override the default
+      open function in unit tests.
+
+  Returns:
+    A hostname, usually in the form of "myapp.appspot.com", based on the
+    application name in the app.yaml file.  If the file can't be found or
+    there's a problem building the name, this will return None.
+  """
+  try:
+    app_yaml_file = open_func(os.path.join(application_path or '.', 'app.yaml'))
+    config = yaml.safe_load(app_yaml_file.read())
+  except IOError:
+    # Couldn't open/read app.yaml.
+    return None
+
+  application = config.get('application')
+  if not application:
+    return None
+
+  if ':' in application:
+    # Don't try to deal with alternate domains.
+    return None
+
+  # If there's a prefix ending in a '~', strip it.
+  tilde_index = application.rfind('~')
+  if tilde_index >= 0:
+    application = application[tilde_index + 1:]
+    if not application:
+      return None
+
+  return '%s.appspot.com' % application
+
+
+def _FetchDiscoveryDoc(config, doc_format):
+  """Fetch discovery documents generated from a cloud service.
+
+  Args:
+    config: An API config.
+    doc_format: The requested format for the discovery doc. (rest|rpc)
+
+  Raises:
+    ServerRequestException: If fetching the generated discovery doc fails.
+
+  Returns:
+    A list of discovery doc strings.
+  """
+  body = json.dumps({'config': config}, indent=2, sort_keys=True)
+  request = urllib2.Request(DISCOVERY_DOC_BASE + doc_format, body)
+  request.add_header('content-type', 'application/json')
+
+  try:
+    with contextlib.closing(urllib2.urlopen(request)) as response:
+      return response.read()
+  except urllib2.HTTPError, error:
+    raise ServerRequestException(error)
+
+
+def _GenDiscoveryDoc(service_class_names, doc_format,
+                     output_path, hostname=None,
+                     application_path=None):
+  """Write discovery documents generated from a cloud service to file.
+
+  Args:
+    service_class_names: A list of fully qualified ProtoRPC service names.
+    doc_format: The requested format for the discovery doc. (rest|rpc)
+    output_path: The directory to output the discovery docs to.
+    hostname: A string hostname which will be used as the default version
+      hostname. If no hostname is specificied in the @endpoints.api decorator,
+      this value is the fallback. Defaults to None.
+    application_path: A string containing the path to the AppEngine app.
+
+  Raises:
+    ServerRequestException: If fetching the generated discovery doc fails.
+
+  Returns:
+    A list of discovery doc filenames.
+  """
+  output_files = []
+  service_configs = GenApiConfig(service_class_names, hostname=hostname,
+                                 application_path=application_path)
+  for api_name_version, config in service_configs.iteritems():
+    discovery_doc = _FetchDiscoveryDoc(config, doc_format)
+    discovery_name = api_name_version + '.discovery'
+    output_files.append(_WriteFile(output_path, discovery_name, discovery_doc))
+
+  return output_files
+
+
+def _GenOpenApiSpec(service_class_names, output_path, hostname=None,
+                    application_path=None):
+  """Write discovery documents generated from a cloud service to file.
+
+  Args:
+    service_class_names: A list of fully qualified ProtoRPC service names.
+    output_path: The directory to which to output the OpenAPI specs.
+    hostname: A string hostname which will be used as the default version
+      hostname. If no hostname is specified in the @endpoints.api decorator,
+      this value is the fallback. Defaults to None.
+    application_path: A string containing the path to the AppEngine app.
+
+  Returns:
+    A list of OpenAPI spec filenames.
+  """
+  output_files = []
+  service_configs = GenApiConfig(
+      service_class_names, hostname=hostname,
+      config_string_generator=openapi_generator.OpenApiGenerator(),
+      application_path=application_path)
+  for api_name_version, config in service_configs.iteritems():
+    openapi_name = api_name_version.replace('-', '') + 'openapi.json'
+    output_files.append(_WriteFile(output_path, openapi_name, config))
+
+  return output_files
+
+
+def _GenClientLib(discovery_path, language, output_path, build_system):
+  """Write a client library from a discovery doc, using a cloud service to file.
+
+  Args:
+    discovery_path: Path to the discovery doc used to generate the client
+      library.
+    language: The client library language to generate. (java)
+    output_path: The directory to output the client library zip to.
+    build_system: The target build system for the client library language.
+
+  Raises:
+    IOError: If reading the discovery doc fails.
+    ServerRequestException: If fetching the generated client library fails.
+
+  Returns:
+    The path to the zipped client library.
+  """
+  with open(discovery_path) as f:
+    discovery_doc = f.read()
+
+  client_name = re.sub(r'\.discovery$', '.zip',
+                       os.path.basename(discovery_path))
+
+  return _GenClientLibFromContents(discovery_doc, language, output_path,
+                                   build_system, client_name)
+
+
+def _GenClientLibFromContents(discovery_doc, language, output_path,
+                              build_system, client_name):
+  """Write a client library from a discovery doc, using a cloud service to file.
+
+  Args:
+    discovery_doc: A string, the contents of the discovery doc used to
+      generate the client library.
+    language: A string, the client library language to generate. (java)
+    output_path: A string, the directory to output the client library zip to.
+    build_system: A string, the target build system for the client language.
+    client_name: A string, the filename used to save the client lib.
+
+  Raises:
+    IOError: If reading the discovery doc fails.
+    ServerRequestException: If fetching the generated client library fails.
+
+  Returns:
+    The path to the zipped client library.
+  """
+
+  body = urllib.urlencode({'lang': language, 'content': discovery_doc,
+                           'layout': build_system})
+  request = urllib2.Request(CLIENT_LIBRARY_BASE, body)
+  try:
+    with contextlib.closing(urllib2.urlopen(request)) as response:
+      content = response.read()
+      return _WriteFile(output_path, client_name, content)
+  except urllib2.HTTPError, error:
+    raise ServerRequestException(error)
+
+
+def _GetClientLib(service_class_names, language, output_path, build_system,
+                  hostname=None, application_path=None):
+  """Fetch client libraries from a cloud service.
+
+  Args:
+    service_class_names: A list of fully qualified ProtoRPC service names.
+    language: The client library language to generate. (java)
+    output_path: The directory to output the discovery docs to.
+    build_system: The target build system for the client library language.
+    hostname: A string hostname which will be used as the default version
+      hostname. If no hostname is specificied in the @endpoints.api decorator,
+      this value is the fallback. Defaults to None.
+    application_path: A string containing the path to the AppEngine app.
+
+  Returns:
+    A list of paths to client libraries.
+  """
+  client_libs = []
+  service_configs = GenApiConfig(service_class_names, hostname=hostname,
+                                 application_path=application_path)
+  for api_name_version, config in service_configs.iteritems():
+    discovery_doc = _FetchDiscoveryDoc(config, 'rest')
+    client_name = api_name_version + '.zip'
+    client_libs.append(
+        _GenClientLibFromContents(discovery_doc, language, output_path,
+                                  build_system, client_name))
+  return client_libs
+
+
+def _GenApiConfigCallback(args, api_func=GenApiConfig):
+  """Generate an api file.
+
+  Args:
+    args: An argparse.Namespace object to extract parameters from.
+    api_func: A function that generates and returns an API configuration
+      for a list of services.
+  """
+  service_configs = api_func(args.service,
+                             hostname=args.hostname,
+                             application_path=args.application)
+
+  for api_name_version, config in service_configs.iteritems():
+    _WriteFile(args.output, api_name_version + '.api', config)
+
+
+def _GetClientLibCallback(args, client_func=_GetClientLib):
+  """Generate discovery docs and client libraries to files.
+
+  Args:
+    args: An argparse.Namespace object to extract parameters from.
+    client_func: A function that generates client libraries and stores them to
+      files, accepting a list of service names, a client library language,
+      an output directory, a build system for the client library language, and
+      a hostname.
+  """
+  client_paths = client_func(
+      args.service, args.language, args.output, args.build_system,
+      hostname=args.hostname, application_path=args.application)
+
+  for client_path in client_paths:
+    print 'API client library written to %s' % client_path
+
+
+def _GenDiscoveryDocCallback(args, discovery_func=_GenDiscoveryDoc):
+  """Generate discovery docs to files.
+
+  Args:
+    args: An argparse.Namespace object to extract parameters from
+    discovery_func: A function that generates discovery docs and stores them to
+      files, accepting a list of service names, a discovery doc format, and an
+      output directory.
+  """
+  discovery_paths = discovery_func(args.service, args.format,
+                                   args.output, hostname=args.hostname,
+                                   application_path=args.application)
+  for discovery_path in discovery_paths:
+    print 'API discovery document written to %s' % discovery_path
+
+
+def _GenOpenApiSpecCallback(args, openapi_func=_GenOpenApiSpec):
+  """Generate OpenAPI (Swagger) specs to files.
+
+  Args:
+    args: An argparse.Namespace object to extract parameters from
+    openapi_func: A function that generates OpenAPI specs and stores them to
+      files, accepting a list of service names and an output directory.
+  """
+  openapi_paths = openapi_func(args.service, args.output,
+                               hostname=args.hostname,
+                               application_path=args.application)
+  for openapi_path in openapi_paths:
+    print 'OpenAPI spec written to %s' % openapi_path
+
+
+def _GenClientLibCallback(args, client_func=_GenClientLib):
+  """Generate a client library to file.
+
+  Args:
+    args: An argparse.Namespace object to extract parameters from
+    client_func: A function that generates client libraries and stores them to
+      files, accepting a path to a discovery doc, a client library language, an
+      output directory, and a build system for the client library language.
+  """
+  client_path = client_func(args.discovery_doc[0], args.language, args.output,
+                            args.build_system)
+  print 'API client library written to %s' % client_path
+
+
+def MakeParser(prog):
+  """Create an argument parser.
+
+  Args:
+    prog: The name of the program to use when outputting help text.
+
+  Returns:
+    An argparse.ArgumentParser built to specification.
+  """
+
+  def AddStandardOptions(parser, *args):
+    """Add common endpoints options to a parser.
+
+    Args:
+      parser: The parser to add options to.
+      *args: A list of option names to add. Possible names are: application,
+        format, output, language, service, and discovery_doc.
+    """
+    if 'application' in args:
+      parser.add_argument('-a', '--application', default='.',
+                          help='The path to the Python App Engine App')
+    if 'format' in args:
+      parser.add_argument('-f', '--format', default='rest',
+                          choices=['rest', 'rpc'],
+                          help='The requested API protocol type')
+    if 'hostname' in args:
+      help_text = ('Default application hostname, if none is specified '
+                   'for API service.')
+      parser.add_argument('--hostname', help=help_text)
+    if 'output' in args:
+      parser.add_argument('-o', '--output', default='.',
+                          help='The directory to store output files')
+    if 'language' in args:
+      parser.add_argument('language',
+                          help='The target output programming language')
+    if 'service' in args:
+      parser.add_argument('service', nargs='+',
+                          help='Fully qualified service class name')
+    if 'discovery_doc' in args:
+      parser.add_argument('discovery_doc', nargs=1,
+                          help='Path to the discovery document')
+    if 'build_system' in args:
+      parser.add_argument('-bs', '--build_system', default='default',
+                          help='The target build system')
+
+  parser = _EndpointsParser(prog=prog)
+  subparsers = parser.add_subparsers(
+      title='subcommands', metavar='{%s}' % ', '.join(_VISIBLE_COMMANDS))
+
+  get_client_lib = subparsers.add_parser(
+      'get_client_lib', help=('Generates discovery documents and client '
+                              'libraries from service classes'))
+  get_client_lib.set_defaults(callback=_GetClientLibCallback)
+  AddStandardOptions(get_client_lib, 'application', 'hostname', 'output',
+                     'language', 'service', 'build_system')
+
+  get_discovery_doc = subparsers.add_parser(
+      'get_discovery_doc',
+      help='Generates discovery documents from service classes')
+  get_discovery_doc.set_defaults(callback=_GenDiscoveryDocCallback)
+  AddStandardOptions(get_discovery_doc, 'application', 'format', 'hostname',
+                     'output', 'service')
+
+  get_openapi_spec = subparsers.add_parser(
+      'get_openapi_spec',
+      help='Generates OpenAPI (Swagger) specs from service classes')
+  get_openapi_spec.set_defaults(callback=_GenOpenApiSpecCallback)
+  AddStandardOptions(get_openapi_spec, 'application', 'hostname', 'output',
+                     'service')
+
+  # Create an alias for get_openapi_spec called get_swagger_spec to support
+  # the old-style naming. This won't be a visible command, but it will still
+  # function to support legacy scripts.
+  get_swagger_spec = subparsers.add_parser(
+      'get_swagger_spec',
+      help='Generates OpenAPI (Swagger) specs from service classes')
+  get_swagger_spec.set_defaults(callback=_GenOpenApiSpecCallback)
+  AddStandardOptions(get_swagger_spec, 'application', 'hostname', 'output',
+                     'service')
+
+  # By removing the help attribute, the following three actions won't be
+  # displayed in usage message
+  gen_api_config = subparsers.add_parser('gen_api_config')
+  gen_api_config.set_defaults(callback=_GenApiConfigCallback)
+  AddStandardOptions(gen_api_config, 'application', 'hostname', 'output',
+                     'service')
+
+  gen_discovery_doc = subparsers.add_parser('gen_discovery_doc')
+  gen_discovery_doc.set_defaults(callback=_GenDiscoveryDocCallback)
+  AddStandardOptions(gen_discovery_doc, 'application', 'format', 'hostname',
+                     'output', 'service')
+
+  gen_client_lib = subparsers.add_parser('gen_client_lib')
+  gen_client_lib.set_defaults(callback=_GenClientLibCallback)
+  AddStandardOptions(gen_client_lib, 'output', 'language', 'discovery_doc',
+                     'build_system')
+
+  return parser
+
+
+def _SetupStubs():
+  tb = testbed.Testbed()
+  tb.setup_env(CURRENT_VERSION_ID='1.0')
+  tb.activate()
+  for k, v in testbed.INIT_STUB_METHOD_NAMES.iteritems():
+    # The old stub initialization code didn't support the image service at all
+    # so we just ignore it here.
+    if k != 'images':
+      getattr(tb, v)()
+
+
+def main(argv):
+  _SetupStubs()
+
+  parser = MakeParser(argv[0])
+  args = parser.parse_args(argv[1:])
+
+  # Handle the common "application" argument here, since most of the handlers
+  # use this.
+  application_path = getattr(args, 'application', None)
+  if application_path is not None:
+    sys.path.insert(0, os.path.abspath(application_path))
+
+  args.callback(args)
+
+
+if __name__ == '__main__':
+  main(sys.argv)