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multipart.rb
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multipart.rb
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# Copyright 2015 Google Inc.
#
# 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.
require 'hurley'
module Google
module Apis
module Core
# Part of a multipart request for holding JSON data
#
# @private
class JsonPart
include Hurley::Multipart::Part
# @return [Fixnum]
# Length of part
attr_reader :length
# @param [String] boundary
# Multipart boundary
# @param [String] value
# JSON content
def initialize(boundary, value, header = {})
@part = build_part(boundary, value)
@length = @part.bytesize
@io = StringIO.new(@part)
end
private
# Format the part
#
# @param [String] boundary
# Multipart boundary
# @param [String] value
# JSON content
# @return [String]
def build_part(boundary, value)
part = ''
part << "--#{boundary}\r\n"
part << "Content-Type: application/json\r\n"
part << "\r\n"
part << "#{value}\r\n"
end
end
# Part of a multipart request for holding arbitrary content. Modified
# from Hurley::Multipart::FilePart to remove Content-Disposition
#
# @private
class FilePart
include Hurley::Multipart::Part
# @return [Fixnum]
# Length of part
attr_reader :length
# @param [String] boundary
# Multipart boundary
# @param [Google::Apis::Core::UploadIO] io
# IO stream
# @param [Hash] header
# Additional headers
def initialize(boundary, io, header = {})
file_length = io.respond_to?(:length) ? io.length : File.size(io.local_path)
@head = build_head(boundary, io.content_type, file_length,
io.respond_to?(:opts) ? io.opts.merge(header) : header)
@length = @head.bytesize + file_length + FOOT.length
@io = Hurley::CompositeReadIO.new(@length, StringIO.new(@head), io, StringIO.new(FOOT))
end
private
# Construct the header for the part
#
# @param [String] boundary
# Multipart boundary
# @param [String] type
# Content type for the part
# @param [Fixnum] content_len
# Length of the part
# @param [Hash] header
# Headers for the part
def build_head(boundary, type, content_len, header)
content_id = ''
if header[:content_id]
content_id = sprintf(CID_FORMAT, header[:content_id])
end
sprintf(HEAD_FORMAT,
boundary,
content_len.to_i,
content_id,
header[:content_type] || type,
header[:content_transfer_encoding] || DEFAULT_TR_ENCODING)
end
DEFAULT_TR_ENCODING = 'binary'.freeze
FOOT = "\r\n".freeze
CID_FORMAT = "Content-ID: %s\r\n"
HEAD_FORMAT = <<-END
--%s\r
Content-Length: %d\r
%sContent-Type: %s\r
Content-Transfer-Encoding: %s\r
\r
END
end
# Helper for building multipart requests
class Multipart
MULTIPART_RELATED = 'multipart/related'
DEFAULT_BOUNDARY = 'RubyApiClientMultiPart'
# @return [String]
# Content type header
attr_reader :content_type
# @param [String] content_type
# Content type for the multipart request
# @param [String] boundary
# Part delimiter
def initialize(content_type: MULTIPART_RELATED, boundary: nil)
@parts = []
@boundary = boundary || DEFAULT_BOUNDARY
@content_type = "#{content_type}; boundary=#{boundary}"
end
# Append JSON data part
#
# @param [String] body
# JSON text
# @param [String] content_id
# Optional unique ID of this part
# @return [self]
def add_json(body, content_id: nil)
header = { :content_id => content_id }
@parts << Google::Apis::Core::JsonPart.new(@boundary, body, header)
self
end
# Append arbitrary data as a part
#
# @param [Google::Apis::Core::UploadIO] upload_io
# IO stream
# @param [String] content_id
# Optional unique ID of this part
# @return [self]
def add_upload(upload_io, content_id: nil)
header = { :content_id => content_id }
@parts << Google::Apis::Core::FilePart.new(@boundary,
upload_io,
header)
self
end
# Assemble the multipart requests
#
# @return [IO]
# IO stream
def assemble
@parts << Hurley::Multipart::EpiloguePart.new(@boundary)
ios = []
len = 0
@parts.each do |part|
len += part.length
ios << part.to_io
end
Hurley::CompositeReadIO.new(len, *ios)
end
end
end
end
end