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# frozen_string_literal: true
module Ethon
class Easy
# This module contains the logic around adding headers to libcurl.
#
# @api private
module Header
# Return headers, return empty hash if none.
#
# @example Return the headers.
# easy.headers
#
# @return [ Hash ] The headers.
def headers
@headers ||= {}
end
# Set the headers.
#
# @example Set the headers.
# easy.headers = {'User-Agent' => 'ethon'}
#
# @param [ Hash ] headers The headers.
def headers=(headers)
headers ||= {}
header_list = nil
headers.each do |k, v|
header_list = Curl.slist_append(header_list, compose_header(k,v))
end
Curl.set_option(:httpheader, header_list, handle)
@header_list = header_list && FFI::AutoPointer.new(header_list, Curl.method(:slist_free_all))
end
# Return header_list.
#
# @example Return header_list.
# easy.header_list
#
# @return [ FFI::Pointer ] The header list.
def header_list
@header_list
end
# Compose libcurl header string from key and value.
# Also replaces null bytes, because libcurl will complain
# otherwise.
#
# @example Compose header.
# easy.compose_header('User-Agent', 'Ethon')
#
# @param [ String ] key The header name.
# @param [ String ] value The header value.
#
# @return [ String ] The composed header.
def compose_header(key, value)
Util.escape_zero_byte("#{key}: #{value}")
end
end
end
end
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