| -- |
| -- 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 core = require("apisix.core") |
| local pairs = pairs |
| local type = type |
| local ngx = ngx |
| |
| |
| local schema = { |
| type = "object", |
| properties = { |
| before_body = { |
| description = "body before the filter phase.", |
| type = "string" |
| }, |
| body = { |
| description = "body to replace upstream response.", |
| type = "string" |
| }, |
| after_body = { |
| description = "body after the modification of filter phase.", |
| type = "string" |
| }, |
| headers = { |
| description = "new headers for response", |
| type = "object", |
| minProperties = 1, |
| }, |
| }, |
| anyOf = { |
| {required = {"before_body"}}, |
| {required = {"body"}}, |
| {required = {"after_body"}} |
| }, |
| minProperties = 1, |
| } |
| |
| local plugin_name = "echo" |
| |
| local _M = { |
| version = 0.1, |
| priority = 412, |
| name = plugin_name, |
| schema = schema, |
| } |
| |
| |
| function _M.check_schema(conf) |
| local ok, err = core.schema.check(schema, conf) |
| if not ok then |
| return false, err |
| end |
| |
| return true |
| end |
| |
| |
| function _M.body_filter(conf, ctx) |
| if conf.body then |
| ngx.arg[1] = conf.body |
| ngx.arg[2] = true |
| end |
| |
| if conf.before_body and not ctx.plugin_echo_body_set then |
| ngx.arg[1] = conf.before_body .. ngx.arg[1] |
| ctx.plugin_echo_body_set = true |
| end |
| |
| if ngx.arg[2] and conf.after_body then |
| ngx.arg[1] = ngx.arg[1] .. conf.after_body |
| end |
| end |
| |
| |
| function _M.header_filter(conf, ctx) |
| if conf.body or conf.before_body or conf.after_body then |
| core.response.clear_header_as_body_modified() |
| end |
| |
| if not conf.headers then |
| return |
| end |
| |
| if not conf.headers_arr then |
| conf.headers_arr = {} |
| |
| for field, value in pairs(conf.headers) do |
| if type(field) == 'string' |
| and (type(value) == 'string' or type(value) == 'number') then |
| if #field == 0 then |
| return false, 'invalid field length in header' |
| end |
| core.table.insert(conf.headers_arr, field) |
| core.table.insert(conf.headers_arr, value) |
| else |
| return false, 'invalid type as header value' |
| end |
| end |
| end |
| |
| local field_cnt = #conf.headers_arr |
| for i = 1, field_cnt, 2 do |
| ngx.header[conf.headers_arr[i]] = conf.headers_arr[i+1] |
| end |
| end |
| |
| return _M |