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# frozen_string_literal: true
module Aws
module Endpoints
# Does substitutions for templated endpoint strings
# This class is deprecated. It is used by the Runtime endpoint
# resolution approach. It has been replaced by a code generated
# approach in each service gem. It can be removed in a new
# major version. It has to exist because
# old service gems can use a new core version.
# @api private
module Templater
class << self
def resolve(string, parameters, assigns)
# scans for strings in curly brackets {}
string.scan(/\{.+?\}/).each do |capture|
value = capture[1..-2] # strips curly brackets
string = string.gsub(capture, replace(value, parameters, assigns))
end
string
end
private
# Replaces the captured value with values from parameters or assign
def replace(capture, parameters, assigns)
# Pound sigil is used for getAttr calls
indexes = capture.split('#')
# no sigil found, just do substitution
if indexes.size == 1
extract_value(capture, parameters, assigns)
# sigil was found, need to call getAttr
elsif indexes.size == 2
ref, property = indexes
param = extract_value(ref, parameters, assigns)
Matchers.attr(param, property)
else
raise "Invalid templatable value: #{capture}"
end
end
# Checks both parameters and assigns hash for the referenced value
def extract_value(key, parameters, assigns)
if assigns.key?(key)
assigns[key]
elsif parameters.class.singleton_class::PARAM_MAP.key?(key)
member_name = parameters.class.singleton_class::PARAM_MAP[key]
parameters[member_name]
else
raise "Templatable value not found: #{key}"
end
end
end
end
end
end
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