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# frozen_string_literal: true
module Gitlab
module Error
# Custom error class for rescuing from all Gitlab errors.
class Error < StandardError; end
# Raised when API endpoint credentials not configured.
class MissingCredentials < Error; end
# Raised when impossible to parse response body.
class Parsing < Error; end
# Custom error class for rescuing from HTTP response errors.
class ResponseError < Error
POSSIBLE_MESSAGE_KEYS = %i[message error_description error].freeze
def initialize(response)
@response = response
super(build_error_message)
end
# Status code returned in the HTTP response.
#
# @return [Integer]
def response_status
@response.code
end
# Body content returned in the HTTP response
#
# @return [String]
def response_message
@response.parsed_response.message
end
# Additional error context returned by some API endpoints
#
# @return [String]
def error_code
if @response.respond_to?(:error_code)
@response.error_code
else
''
end
end
private
# Human friendly message.
#
# @return [String]
def build_error_message
parsed_response = classified_response
message = check_error_keys(parsed_response)
"Server responded with code #{@response.code}, message: " \
"#{handle_message(message)}. " \
"Request URI: #{@response.request.base_uri}#{@response.request.path}"
end
# Error keys vary across the API, find the first key that the parsed_response
# object responds to and return that, otherwise return the original.
def check_error_keys(resp)
key = POSSIBLE_MESSAGE_KEYS.find { |k| resp.respond_to?(k) }
key ? resp.send(key) : resp
end
# Parse the body based on the classification of the body content type
#
# @return parsed response
def classified_response
if @response.respond_to?('headers')
@response.headers['content-type'] == 'text/plain' ? { message: @response.to_s } : @response.parsed_response
else
@response.parsed_response
end
rescue Gitlab::Error::Parsing
# Return stringified response when receiving a
# parsing error to avoid obfuscation of the
# api error.
#
# note: The Gitlab API does not always return valid
# JSON when there are errors.
@response.to_s
end
# Handle error response message in case of nested hashes
def handle_message(message)
case message
when Gitlab::ObjectifiedHash
message.to_h.sort.map do |key, val|
"'#{key}' #{(val.is_a?(Hash) ? val.sort.map { |k, v| "(#{k}: #{v.join(' ')})" } : [val].flatten).join(' ')}"
end.join(', ')
when Array
message.join(' ')
else
message
end
end
end
# Raised when API endpoint returns the HTTP status code 400.
class BadRequest < ResponseError; end
# Raised when API endpoint returns the HTTP status code 401.
class Unauthorized < ResponseError; end
# Raised when API endpoint returns the HTTP status code 403.
class Forbidden < ResponseError; end
# Raised when API endpoint returns the HTTP status code 404.
class NotFound < ResponseError; end
# Raised when API endpoint returns the HTTP status code 405.
class MethodNotAllowed < ResponseError; end
# Raised when API endpoint returns the HTTP status code 406.
class NotAcceptable < ResponseError; end
# Raised when API endpoint returns the HTTP status code 409.
class Conflict < ResponseError; end
# Raised when API endpoint returns the HTTP status code 422.
class Unprocessable < ResponseError; end
# Raised when API endpoint returns the HTTP status code 429.
class TooManyRequests < ResponseError; end
# Raised when API endpoint returns the HTTP status code 500.
class InternalServerError < ResponseError; end
# Raised when API endpoint returns the HTTP status code 502.
class BadGateway < ResponseError; end
# Raised when API endpoint returns the HTTP status code 503.
class ServiceUnavailable < ResponseError; end
# HTTP status codes mapped to error classes.
STATUS_MAPPINGS = {
400 => BadRequest,
401 => Unauthorized,
403 => Forbidden,
404 => NotFound,
405 => MethodNotAllowed,
406 => NotAcceptable,
409 => Conflict,
422 => Unprocessable,
429 => TooManyRequests,
500 => InternalServerError,
502 => BadGateway,
503 => ServiceUnavailable
}.freeze
end
end
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