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# frozen_string_literal: true
module Faraday
# FlatParamsEncoder manages URI params as a flat hash. Any Array values repeat
# the parameter multiple times.
module FlatParamsEncoder
class << self
extend Forwardable
def_delegators :'Faraday::Utils', :escape, :unescape
end
# Encode converts the given param into a URI querystring. Keys and values
# will converted to strings and appropriately escaped for the URI.
#
# @param params [Hash] query arguments to convert.
#
# @example
#
# encode({a: %w[one two three], b: true, c: "C"})
# # => 'a=one&a=two&a=three&b=true&c=C'
#
# @return [String] the URI querystring (without the leading '?')
def self.encode(params)
return nil if params.nil?
unless params.is_a?(Array)
unless params.respond_to?(:to_hash)
raise TypeError,
"Can't convert #{params.class} into Hash."
end
params = params.to_hash
params = params.map do |key, value|
key = key.to_s if key.is_a?(Symbol)
[key, value]
end
# Only to be used for non-Array inputs. Arrays should preserve order.
params.sort! if @sort_params
end
# The params have form [['key1', 'value1'], ['key2', 'value2']].
buffer = +''
params.each do |key, value|
encoded_key = escape(key)
if value.nil?
buffer << "#{encoded_key}&"
elsif value.is_a?(Array)
if value.empty?
buffer << "#{encoded_key}=&"
else
value.each do |sub_value|
encoded_value = escape(sub_value)
buffer << "#{encoded_key}=#{encoded_value}&"
end
end
else
encoded_value = escape(value)
buffer << "#{encoded_key}=#{encoded_value}&"
end
end
buffer.chop
end
# Decode converts the given URI querystring into a hash.
#
# @param query [String] query arguments to parse.
#
# @example
#
# decode('a=one&a=two&a=three&b=true&c=C')
# # => {"a"=>["one", "two", "three"], "b"=>"true", "c"=>"C"}
#
# @return [Hash] parsed keys and value strings from the querystring.
def self.decode(query)
return nil if query.nil?
empty_accumulator = {}
split_query = query.split('&').filter_map do |pair|
pair.split('=', 2) if pair && !pair.empty?
end
split_query.each_with_object(empty_accumulator.dup) do |pair, accu|
pair[0] = unescape(pair[0])
pair[1] = true if pair[1].nil?
if pair[1].respond_to?(:to_str)
pair[1] = unescape(pair[1].to_str.tr('+', ' '))
end
if accu[pair[0]].is_a?(Array)
accu[pair[0]] << pair[1]
elsif accu[pair[0]]
accu[pair[0]] = [accu[pair[0]], pair[1]]
else
accu[pair[0]] = pair[1]
end
end
end
class << self
attr_accessor :sort_params
end
# Useful default for OAuth and caching.
@sort_params = true
end
end
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