79 lines
2.5 KiB
Ruby
79 lines
2.5 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Import
|
|
class ValidateRemoteGitEndpointService
|
|
# Validates if the remote endpoint is a valid GIT repository
|
|
# Only smart protocol is supported
|
|
# Validation rules are taken from https://git-scm.com/docs/http-protocol#_smart_clients
|
|
|
|
GIT_SERVICE_NAME = "git-upload-pack"
|
|
GIT_EXPECTED_FIRST_PACKET_LINE = "# service=#{GIT_SERVICE_NAME}"
|
|
GIT_BODY_MESSAGE_REGEXP = /^[0-9a-f]{4}#{GIT_EXPECTED_FIRST_PACKET_LINE}/.freeze
|
|
# https://github.com/git/git/blob/master/Documentation/technical/protocol-common.txt#L56-L59
|
|
GIT_PROTOCOL_PKT_LEN = 4
|
|
GIT_MINIMUM_RESPONSE_LENGTH = GIT_PROTOCOL_PKT_LEN + GIT_EXPECTED_FIRST_PACKET_LINE.length
|
|
EXPECTED_CONTENT_TYPE = "application/x-#{GIT_SERVICE_NAME}-advertisement"
|
|
|
|
def initialize(params)
|
|
@params = params
|
|
end
|
|
|
|
def execute
|
|
uri = Gitlab::Utils.parse_url(@params[:url])
|
|
|
|
return ServiceResponse.error(message: "#{@params[:url]} is not a valid URL") unless uri
|
|
|
|
return ServiceResponse.success if uri.scheme == 'git'
|
|
|
|
uri.fragment = nil
|
|
url = Gitlab::Utils.append_path(uri.to_s, "/info/refs?service=#{GIT_SERVICE_NAME}")
|
|
|
|
response_body = ''
|
|
result = nil
|
|
Gitlab::HTTP.try_get(url, stream_body: true, follow_redirects: false, basic_auth: auth) do |fragment|
|
|
response_body += fragment
|
|
next if response_body.length < GIT_MINIMUM_RESPONSE_LENGTH
|
|
|
|
result = if status_code_is_valid(fragment) && content_type_is_valid(fragment) && response_body_is_valid(response_body)
|
|
:success
|
|
else
|
|
:error
|
|
end
|
|
|
|
# We are interested only in the first chunks of the response
|
|
# So we're using stream_body: true and breaking when receive enough body
|
|
break
|
|
end
|
|
|
|
if result == :success
|
|
ServiceResponse.success
|
|
else
|
|
ServiceResponse.error(message: "#{uri} is not a valid HTTP Git repository")
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
def auth
|
|
unless @params[:user].to_s.blank?
|
|
{
|
|
username: @params[:user],
|
|
password: @params[:password]
|
|
}
|
|
end
|
|
end
|
|
|
|
def status_code_is_valid(fragment)
|
|
fragment.http_response.code == '200'
|
|
end
|
|
|
|
def content_type_is_valid(fragment)
|
|
fragment.http_response['content-type'] == EXPECTED_CONTENT_TYPE
|
|
end
|
|
|
|
def response_body_is_valid(response_body)
|
|
response_body.match?(GIT_BODY_MESSAGE_REGEXP)
|
|
end
|
|
end
|
|
end
|