mirror of
https://github.com/alibaba/higress.git
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135 lines
3.9 KiB
Go
135 lines
3.9 KiB
Go
// Copyright (c) 2022 Alibaba Group Holding Ltd.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"time"
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"github.com/alibaba/higress/plugins/wasm-go/pkg/wrapper"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
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"github.com/higress-group/proxy-wasm-go-sdk/proxywasm/types"
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"github.com/tidwall/gjson"
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)
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func main() {
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wrapper.SetCtx(
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"opa",
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wrapper.ParseConfigBy(parseConfig),
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wrapper.ProcessRequestHeadersBy(onHttpRequestHeaders),
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wrapper.ProcessRequestBodyBy(onHttpRequestBody),
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)
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}
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type Metadata struct {
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Input map[string]interface{} `json:"input"`
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}
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func parseConfig(json gjson.Result, config *OpaConfig, log wrapper.Log) error {
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policy := json.Get("policy").String()
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if strings.TrimSpace(policy) == "" {
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return errors.New("policy not allow empty")
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}
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timeout := json.Get("timeout").String()
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if strings.TrimSpace(timeout) == "" {
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return errors.New("timeout not allow empty")
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}
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duration, err := time.ParseDuration(timeout)
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if err != nil {
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return errors.New("timeout parse fail: " + err.Error())
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}
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var uint32Duration uint32
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if duration.Milliseconds() > int64(^uint32(0)) {
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} else {
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uint32Duration = uint32(duration.Milliseconds())
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}
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config.timeout = uint32Duration
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client, err := Client(json)
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if err != nil {
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return err
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}
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config.client = client
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config.policy = policy
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return nil
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}
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func onHttpRequestHeaders(ctx wrapper.HttpContext, config OpaConfig, log wrapper.Log) types.Action {
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return opaCall(ctx, config, nil, log)
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}
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func onHttpRequestBody(ctx wrapper.HttpContext, config OpaConfig, body []byte, log wrapper.Log) types.Action {
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return opaCall(ctx, config, body, log)
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}
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func opaCall(ctx wrapper.HttpContext, config OpaConfig, body []byte, log wrapper.Log) types.Action {
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request := make(map[string]interface{}, 6)
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headers, _ := proxywasm.GetHttpRequestHeaders()
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request["method"] = ctx.Method()
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request["scheme"] = ctx.Scheme()
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request["path"] = ctx.Path()
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request["headers"] = headers
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if len(body) != 0 {
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request["body"] = body
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}
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parse, _ := url.Parse(ctx.Path())
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query, _ := url.ParseQuery(parse.RawQuery)
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request["query"] = query
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data, _ := json.Marshal(Metadata{Input: map[string]interface{}{"request": request}})
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if err := config.client.Post(fmt.Sprintf("/v1/data/%s/allow", config.policy),
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[][2]string{{"Content-Type", "application/json"}},
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data, rspCall, config.timeout); err != nil {
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log.Errorf("client opa fail %v", err)
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return types.ActionPause
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}
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return types.ActionPause
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}
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func rspCall(statusCode int, _ http.Header, responseBody []byte) {
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if statusCode != http.StatusOK {
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proxywasm.SendHttpResponseWithDetail(uint32(statusCode), "opa.status_ne_200", nil, []byte("opa state not is 200"), -1)
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return
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}
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var rsp map[string]interface{}
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if err := json.Unmarshal(responseBody, &rsp); err != nil {
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proxywasm.SendHttpResponseWithDetail(http.StatusInternalServerError, "opa.bad_response_body", nil, []byte(fmt.Sprintf("opa parse rsp fail %+v", err)), -1)
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return
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}
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result, ok := rsp["result"].(bool)
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if !ok {
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proxywasm.SendHttpResponseWithDetail(http.StatusInternalServerError, "opa.conversion_fail", nil, []byte("rsp type conversion fail"), -1)
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return
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}
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if !result {
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proxywasm.SendHttpResponseWithDetail(http.StatusUnauthorized, "opa.server_not_allowed", nil, []byte("opa server not allowed"), -1)
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return
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}
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proxywasm.ResumeHttpRequest()
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}
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