| -- |
| -- 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 plugin_name = "proxy-rewrite" |
| local pairs = pairs |
| local ipairs = ipairs |
| local ngx = ngx |
| local type = type |
| local re_sub = ngx.re.sub |
| local sub_str = string.sub |
| local str_find = core.string.find |
| |
| local schema = { |
| type = "object", |
| properties = { |
| uri = { |
| description = "new uri for upstream", |
| type = "string", |
| minLength = 1, |
| maxLength = 4096, |
| pattern = [[^\/.*]], |
| }, |
| regex_uri = { |
| description = "new uri that substitute from client uri " .. |
| "for upstream, lower priority than uri property", |
| type = "array", |
| maxItems = 2, |
| minItems = 2, |
| items = { |
| description = "regex uri", |
| type = "string", |
| } |
| }, |
| host = { |
| description = "new host for upstream", |
| type = "string", |
| pattern = [[^[0-9a-zA-Z-.]+(:\d{1,5})?$]], |
| }, |
| scheme = { |
| description = "new scheme for upstream", |
| type = "string", |
| enum = {"http", "https"} |
| }, |
| headers = { |
| description = "new headers for request", |
| type = "object", |
| minProperties = 1, |
| }, |
| }, |
| minProperties = 1, |
| additionalProperties = false, |
| } |
| |
| |
| local _M = { |
| version = 0.1, |
| priority = 1008, |
| 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 |
| |
| if conf.regex_uri and #conf.regex_uri > 0 then |
| local _, _, err = re_sub("/fake_uri", conf.regex_uri[1], |
| conf.regex_uri[2], "jo") |
| if err then |
| return false, "invalid regex_uri(" .. conf.regex_uri[1] .. |
| ", " .. conf.regex_uri[2] .. "): " .. err |
| end |
| end |
| |
| -- check headers |
| if not conf.headers then |
| return true |
| end |
| |
| for field, value in pairs(conf.headers) do |
| if type(field) ~= 'string' then |
| return false, 'invalid type as header field' |
| end |
| |
| if type(value) ~= 'string' and type(value) ~= 'number' then |
| return false, 'invalid type as header value' |
| end |
| |
| if #field == 0 then |
| return false, 'invalid field length in header' |
| end |
| |
| core.log.info("header field: ", field) |
| |
| if not core.utils.validate_header_field(field) then |
| return false, 'invalid field character in header' |
| end |
| |
| if not core.utils.validate_header_value(value) then |
| return false, 'invalid value character in header' |
| end |
| end |
| |
| return true |
| end |
| |
| |
| do |
| local upstream_vars = { |
| host = "upstream_host", |
| upgrade = "upstream_upgrade", |
| connection = "upstream_connection", |
| } |
| local upstream_names = {} |
| for name, _ in pairs(upstream_vars) do |
| core.table.insert(upstream_names, name) |
| end |
| |
| function _M.rewrite(conf, ctx) |
| for _, name in ipairs(upstream_names) do |
| if conf[name] then |
| ctx.var[upstream_vars[name]] = conf[name] |
| end |
| end |
| if conf["scheme"] then |
| ctx.upstream_scheme = conf["scheme"] |
| end |
| |
| local upstream_uri = ctx.var.uri |
| if conf.uri ~= nil then |
| upstream_uri = core.utils.resolve_var(conf.uri, ctx.var) |
| elseif conf.regex_uri ~= nil then |
| local uri, _, err = re_sub(ctx.var.uri, conf.regex_uri[1], |
| conf.regex_uri[2], "jo") |
| if uri then |
| upstream_uri = uri |
| else |
| local msg = "failed to substitute the uri " .. ctx.var.uri .. |
| " (" .. conf.regex_uri[1] .. ") with " .. |
| conf.regex_uri[2] .. " : " .. err |
| core.log.error(msg) |
| return 500, {message = msg} |
| end |
| end |
| |
| local index = str_find(upstream_uri, "?") |
| if index then |
| upstream_uri = core.utils.uri_safe_encode(sub_str(upstream_uri, 1, index-1)) .. |
| sub_str(upstream_uri, index) |
| else |
| upstream_uri = core.utils.uri_safe_encode(upstream_uri) |
| end |
| |
| if ctx.var.is_args == "?" then |
| if index then |
| ctx.var.upstream_uri = upstream_uri .. "&" .. (ctx.var.args or "") |
| else |
| ctx.var.upstream_uri = upstream_uri .. "?" .. (ctx.var.args or "") |
| end |
| else |
| ctx.var.upstream_uri = upstream_uri |
| end |
| |
| if not conf.headers then |
| return |
| end |
| |
| -- reform header from object into array, so can avoid use pairs, |
| -- which is NYI |
| if not conf.headers_arr then |
| conf.headers_arr = {} |
| |
| for field, value in pairs(conf.headers) do |
| core.table.insert_tail(conf.headers_arr, field, value) |
| end |
| end |
| |
| local field_cnt = #conf.headers_arr |
| for i = 1, field_cnt, 2 do |
| ngx.req.set_header(conf.headers_arr[i], |
| core.utils.resolve_var(conf.headers_arr[i+1], ctx.var)) |
| end |
| end |
| |
| end -- do |
| |
| |
| return _M |