# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# https://developers.google.com/protocol-buffers/
#
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"""Contains routines for printing protocol messages in JSON format.

Simple usage example:

  # Create a proto object and serialize it to a json format string.
  message = my_proto_pb2.MyMessage(foo='bar')
  json_string = json_format.MessageToJson(message)

  # Parse a json format string to proto object.
  message = json_format.Parse(json_string, my_proto_pb2.MyMessage())
"""

__author__ = 'jieluo@google.com (Jie Luo)'

import base64
import json
import math
import six
import sys

from google.protobuf import descriptor
from google.protobuf import symbol_database

_TIMESTAMPFOMAT = '%Y-%m-%dT%H:%M:%S'
_INT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT32,
                        descriptor.FieldDescriptor.CPPTYPE_UINT32,
                        descriptor.FieldDescriptor.CPPTYPE_INT64,
                        descriptor.FieldDescriptor.CPPTYPE_UINT64])
_INT64_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_INT64,
                          descriptor.FieldDescriptor.CPPTYPE_UINT64])
_FLOAT_TYPES = frozenset([descriptor.FieldDescriptor.CPPTYPE_FLOAT,
                          descriptor.FieldDescriptor.CPPTYPE_DOUBLE])
_INFINITY = 'Infinity'
_NEG_INFINITY = '-Infinity'
_NAN = 'NaN'


class Error(Exception):
  """Top-level module error for json_format."""


class SerializeToJsonError(Error):
  """Thrown if serialization to JSON fails."""


class ParseError(Error):
  """Thrown in case of parsing error."""


def MessageToJson(message, including_default_value_fields=False):
  """Converts protobuf message to JSON format.

  Args:
    message: The protocol buffers message instance to serialize.
    including_default_value_fields: If True, singular primitive fields,
        repeated fields, and map fields will always be serialized.  If
        False, only serialize non-empty fields.  Singular message fields
        and oneof fields are not affected by this option.

  Returns:
    A string containing the JSON formatted protocol buffer message.
  """
  js = _MessageToJsonObject(message, including_default_value_fields)
  return json.dumps(js, indent=2)


def _MessageToJsonObject(message, including_default_value_fields):
  """Converts message to an object according to Proto3 JSON Specification."""
  message_descriptor = message.DESCRIPTOR
  full_name = message_descriptor.full_name
  if _IsWrapperMessage(message_descriptor):
    return _WrapperMessageToJsonObject(message)
  if full_name in _WKTJSONMETHODS:
    return _WKTJSONMETHODS[full_name][0](
        message, including_default_value_fields)
  js = {}
  return _RegularMessageToJsonObject(
      message, js, including_default_value_fields)


def _IsMapEntry(field):
  return (field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
          field.message_type.has_options and
          field.message_type.GetOptions().map_entry)


def _RegularMessageToJsonObject(message, js, including_default_value_fields):
  """Converts normal message
 according to Proto3 JSON Specification."""
  fields = message.ListFields()
  include_default = including_default_value_fields

  try:
    for field, value in fields:
      name = field.camelcase_name
      if _IsMapEntry(field):
        # Convert a map field.
        v_field = field.message_type.fields_by_nam
e['value']
        js_map = {}
        for key in value:
          if isinstance(key, bool):
            if key:
              recorded_key = 'true'
            else:
              recorded_key = 'false'
          else:
            recorded_key = key
          js_map[recorded_key] = _FieldToJsonObject(
              v_field, value[key], including_default_value_fields)
        js[name] = js_map
      elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
        # Convert a repeated field.
        js[name] = [_FieldToJsonObject(field, k, include_default)
                    for k in value]
      else:
        js[name] = _FieldToJsonObject(field, value, include_default)

    # Serialize default value if including_default_value_fields is True.
    if including_default_value_fields:
      message_descriptor = message.DESCRIPTOR
      for field in message_descriptor.fields:
        # Singular message fields and oneof fields will not be affected.
        if ((field.label != descriptor.FieldDescriptor.LABEL_REPEATED and
             field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE) or
            field.containing_oneof):
          continue
        name = field.camelcase_name
        if name in js:
          # Skip the field which has been serailized already.
          continue
        if _IsMapEntry(field):
          js[name] = {}
        elif field.label == descriptor.FieldDescriptor.LABEL_REPEATED:
          js[name] = []
        else:
          js[name] = _FieldToJsonObject(field, field.default_value)

  except ValueError as e:
    raise SerializeToJsonError(
        'Failed to serialize {0} field: {1}.'.format(field.name, e))

  return js


def _FieldToJsonObject(
    field, value, including_default_value_fields=False):
  """Converts field value according to Proto3 JSON Specification."""
  if field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE:
    return _MessageToJsonObject(value, including_default_value_fields)
  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_ENUM:
    enum_value = field.enum_type.values_by_number.get(value, None)
    if enum_value is not None:
      return enum_value.name
    else:
      raise SerializeToJsonError('Enum field contains an integer value '
                                 'which can not mapped to an enum value.')
  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_STRING:
    if field.type == descriptor.FieldDescriptor.TYPE_BYTES:
      # Use base64 Data encoding for bytes
      return base64.b64encode(value).decode('utf-8')
    else:
      return value
  elif field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_BOOL:
    return bool(value)
  elif field.cpp_type in _INT64_TYPES:
    return str(value)
  elif field.cpp_type in _FLOAT_TYPES:
    if math.isinf(value):
      if value < 0.0:
        return _NEG_INFINITY
      else:
        return _INFINITY
    if math.isnan(value):
      return _NAN
  return value


def _AnyMessageToJsonObject(message, including_default):
  """Converts Any message according to Proto3 JSON Specification."""
  if not message.ListFields():
    return {}
  js = {}
  type_url = message.type_url
  js['@type'] = type_url
  sub_message = _CreateMessageFromTypeUrl(type_url)
  sub_message.ParseFromString(message.value)
  message_descriptor =