| /* |
| * 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. |
| */ |
| |
| package proxyrewrite |
| |
| import ( |
| "regexp" |
| ) |
| |
| import ( |
| "github.com/pkg/errors" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/common/constant" |
| "github.com/apache/dubbo-go-pixiu/pkg/common/extension/filter" |
| contexthttp "github.com/apache/dubbo-go-pixiu/pkg/context/http" |
| "github.com/apache/dubbo-go-pixiu/pkg/logger" |
| ) |
| |
| const ( |
| Kind = constant.HTTPProxyRewriteFilter |
| ) |
| |
| func init() { |
| filter.RegisterHttpFilter(&Plugin{}) |
| } |
| |
| type ( |
| // Plugin is http filter plugin. |
| Plugin struct { |
| } |
| |
| // FilterFactory is http filter instance |
| FilterFactory struct { |
| cfg *Config |
| } |
| //Filter |
| Filter struct { |
| Headers map[string]string |
| |
| uriRegex *regexp.Regexp |
| replace string |
| } |
| //Config |
| Config struct { |
| UriRegex []string `yaml:"uri_regex" json:"uri_regex"` |
| Headers map[string]string `yaml:"headers" json:"headers"` |
| } |
| ) |
| |
| func (p *Plugin) Kind() string { |
| return Kind |
| } |
| |
| func (p *Plugin) CreateFilterFactory() (filter.HttpFilterFactory, error) { |
| return &FilterFactory{cfg: &Config{}}, nil |
| } |
| |
| func (factory *FilterFactory) Config() interface{} { |
| return factory.cfg |
| } |
| |
| func (factory *FilterFactory) Apply() error { |
| if len(factory.cfg.UriRegex) != 2 { |
| return errors.Errorf("UriRegex len must == 2, %v", factory.cfg.UriRegex) |
| } |
| return nil |
| } |
| |
| func (factory *FilterFactory) PrepareFilterChain(ctx *contexthttp.HttpContext, chain filter.FilterChain) error { |
| cfg := factory.cfg |
| |
| headers := make(map[string]string, len(cfg.Headers)) |
| for k, v := range cfg.Headers { |
| headers[k] = v |
| } |
| f := &Filter{uriRegex: regexp.MustCompile(cfg.UriRegex[0]), replace: cfg.UriRegex[1], Headers: headers} |
| |
| chain.AppendDecodeFilters(f) |
| return nil |
| } |
| |
| func (f *Filter) Decode(c *contexthttp.HttpContext) filter.FilterStatus { |
| url := c.GetUrl() |
| |
| newUrl := f.uriRegex.ReplaceAllString(url, f.replace) |
| logger.Infof("proxy rewrite filter change url from %s to %s", url, newUrl) |
| c.SetUrl(newUrl) |
| |
| if len(f.Headers) > 0 { |
| for k, v := range f.Headers { |
| logger.Infof("proxy rewrite filter add header key %s and value %s", k, v) |
| c.AddHeader(k, v) |
| } |
| } |
| return filter.Continue |
| } |