| -- |
| -- 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 http = require("resty.http") |
| local helper = require("apisix.plugins.opa.helper") |
| local type = type |
| |
| local schema = { |
| type = "object", |
| properties = { |
| host = {type = "string"}, |
| ssl_verify = { |
| type = "boolean", |
| default = true, |
| }, |
| policy = {type = "string"}, |
| timeout = { |
| type = "integer", |
| minimum = 1, |
| maximum = 60000, |
| default = 3000, |
| description = "timeout in milliseconds", |
| }, |
| keepalive = {type = "boolean", default = true}, |
| keepalive_timeout = {type = "integer", minimum = 1000, default = 60000}, |
| keepalive_pool = {type = "integer", minimum = 1, default = 5}, |
| with_route = {type = "boolean", default = false}, |
| with_service = {type = "boolean", default = false}, |
| with_consumer = {type = "boolean", default = false}, |
| }, |
| required = {"host", "policy"} |
| } |
| |
| |
| local _M = { |
| version = 0.1, |
| priority = 2001, |
| name = "opa", |
| schema = schema, |
| } |
| |
| |
| function _M.check_schema(conf) |
| return core.schema.check(schema, conf) |
| end |
| |
| |
| function _M.access(conf, ctx) |
| local body = helper.build_opa_input(conf, ctx, "http") |
| |
| local params = { |
| method = "POST", |
| body = core.json.encode(body), |
| headers = { |
| ["Content-Type"] = "application/json", |
| }, |
| keepalive = conf.keepalive, |
| ssl_verify = conf.ssl_verify |
| } |
| |
| if conf.keepalive then |
| params.keepalive_timeout = conf.keepalive_timeout |
| params.keepalive_pool = conf.keepalive_pool |
| end |
| |
| local endpoint = conf.host .. "/v1/data/" .. conf.policy |
| |
| local httpc = http.new() |
| httpc:set_timeout(conf.timeout) |
| |
| local res, err = httpc:request_uri(endpoint, params) |
| |
| -- block by default when decision is unavailable |
| if not res then |
| core.log.error("failed to process OPA decision, err: ", err) |
| return 403 |
| end |
| |
| -- parse the results of the decision |
| local data, err = core.json.decode(res.body) |
| |
| if not data then |
| core.log.error("invalid response body: ", res.body, " err: ", err) |
| return 503 |
| end |
| |
| if not data.result then |
| core.log.error("invalid OPA decision format: ", res.body, |
| " err: `result` field does not exist") |
| return 503 |
| end |
| |
| local result = data.result |
| |
| if not result.allow then |
| if result.headers then |
| core.response.set_header(result.headers) |
| end |
| |
| local status_code = 403 |
| if result.status_code then |
| status_code = result.status_code |
| end |
| |
| local reason = nil |
| if result.reason then |
| reason = type(result.reason) == "table" |
| and core.json.encode(result.reason) |
| or result.reason |
| end |
| |
| return status_code, reason |
| end |
| end |
| |
| |
| return _M |