| -- |
| -- Licensed to the Apache Software Foundation (ASF) under one or more |
| -- contributor license agreements. See the NOTICE file distributed with |
| -- this work for additional information regarding copyright ownership. |
| -- The ASF licenses this file to You under the Apache License, Version 2.0 |
| -- (the "License"); you may not use this file except in compliance with |
| -- the License. You may obtain a copy of the License at |
| -- |
| -- http://www.apache.org/licenses/LICENSE-2.0 |
| -- |
| -- Unless required by applicable law or agreed to in writing, software |
| -- distributed under the License is distributed on an "AS IS" BASIS, |
| -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| -- See the License for the specific language governing permissions and |
| -- limitations under the License. |
| -- |
| |
| local ngx = ngx |
| local core = require("apisix.core") |
| local uuid = require("resty.jit-uuid") |
| local nanoid = require("nanoid") |
| local math_random = math.random |
| local str_byte = string.byte |
| local ffi = require "ffi" |
| |
| local plugin_name = "request-id" |
| |
| local schema = { |
| type = "object", |
| properties = { |
| header_name = {type = "string", default = "X-Request-Id"}, |
| include_in_response = {type = "boolean", default = true}, |
| algorithm = { |
| type = "string", |
| enum = {"uuid", "nanoid", "range_id"}, |
| default = "uuid" |
| }, |
| range_id = { |
| type = "object", |
| properties = { |
| length = { |
| type = "integer", |
| minimum = 6, |
| default = 16 |
| }, |
| char_set = { |
| type = "string", |
| -- The Length is set to 6 just avoid too short length, it may repeat |
| minLength = 6, |
| default = "abcdefghijklmnopqrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ0123456789" |
| } |
| }, |
| default = {} |
| } |
| } |
| } |
| |
| local _M = { |
| version = 0.1, |
| priority = 12015, |
| name = plugin_name, |
| schema = schema |
| } |
| |
| function _M.check_schema(conf) |
| return core.schema.check(schema, conf) |
| end |
| |
| -- generate range_id |
| local function get_range_id(range_id) |
| local res = ffi.new("unsigned char[?]", range_id.length) |
| for i = 0, range_id.length - 1 do |
| res[i] = str_byte(range_id.char_set, math_random(#range_id.char_set)) |
| end |
| return ffi.string(res, range_id.length) |
| end |
| |
| local function get_request_id(conf) |
| if conf.algorithm == "uuid" then |
| return uuid() |
| end |
| if conf.algorithm == "nanoid" then |
| return nanoid.safe_simple() |
| end |
| |
| if conf.algorithm == "range_id" then |
| return get_range_id(conf.range_id) |
| end |
| |
| return uuid() |
| end |
| |
| |
| function _M.rewrite(conf, ctx) |
| local headers = ngx.req.get_headers() |
| local uuid_val |
| if not headers[conf.header_name] then |
| uuid_val = get_request_id(conf) |
| core.request.set_header(ctx, conf.header_name, uuid_val) |
| else |
| uuid_val = headers[conf.header_name] |
| end |
| |
| if conf.include_in_response then |
| ctx["request-id-" .. conf.header_name] = uuid_val |
| end |
| end |
| |
| function _M.header_filter(conf, ctx) |
| if not conf.include_in_response then |
| return |
| end |
| |
| local headers = ngx.resp.get_headers() |
| if not headers[conf.header_name] then |
| core.response.set_header(conf.header_name, ctx["request-id-" .. conf.header_name]) |
| end |
| end |
| |
| return _M |