| /* |
| * 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 cors |
| |
| import ( |
| stdHttp "net/http" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-go-pixiu/pkg/common/constant" |
| "github.com/apache/dubbo-go-pixiu/pkg/common/extension/filter" |
| "github.com/apache/dubbo-go-pixiu/pkg/context/http" |
| ) |
| |
| const ( |
| // Kind is the kind of Fallback. |
| Kind = constant.HTTPCorsFilter |
| ) |
| |
| func init() { |
| filter.RegisterHttpFilter(&Plugin{}) |
| } |
| |
| type ( |
| // Plugin is http filter plugin. |
| Plugin struct { |
| } |
| |
| // FilterFactory is http filter instance |
| FilterFactory struct { |
| cfg *Config |
| } |
| Filter struct { |
| cfg *Config |
| } |
| |
| // Config describe the config of FilterFactory |
| Config struct { |
| AllowOrigin []string `yaml:"allow_origin" json:"allow_origin" mapstructure:"allow_origin"` |
| // AllowMethods access-control-allow-methods |
| AllowMethods string `yaml:"allow_methods" json:"allow_methods" mapstructure:"allow_methods"` |
| // AllowHeaders access-control-allow-headers |
| AllowHeaders string `yaml:"allow_headers" json:"allow_headers" mapstructure:"allow_headers"` |
| // ExposeHeaders access-control-expose-headers |
| ExposeHeaders string `yaml:"expose_headers" json:"expose_headers" mapstructure:"expose_headers"` |
| // MaxAge access-control-max-age |
| MaxAge string `yaml:"max_age" json:"max_age" mapstructure:"max_age"` |
| AllowCredentials bool `yaml:"allow_credentials" json:"allow_credentials" mapstructure:"allow_credentials"` |
| } |
| ) |
| |
| func (p *Plugin) Kind() string { |
| return Kind |
| } |
| |
| func (p *Plugin) CreateFilterFactory() (filter.HttpFilterFactory, error) { |
| return &FilterFactory{cfg: &Config{}}, nil |
| } |
| |
| func (factory *FilterFactory) PrepareFilterChain(ctx *http.HttpContext, chain filter.FilterChain) error { |
| f := &Filter{cfg: factory.cfg} |
| chain.AppendDecodeFilters(f) |
| return nil |
| } |
| |
| func (f *Filter) Decode(ctx *http.HttpContext) filter.FilterStatus { |
| writer := ctx.Writer |
| c := f.cfg |
| if c == nil { |
| return filter.Continue |
| } |
| if ctx.GetHeader(constant.Origin) == "" { |
| // not a cors request |
| return filter.Continue |
| } |
| |
| domains := c.AllowOrigin |
| if len(domains) != 0 { |
| for _, domain := range domains { |
| if domain == "*" || ctx.GetHeader("Origin") == domain { |
| writer.Header().Add(constant.HeaderKeyAccessControlAllowOrigin, domain) |
| continue |
| } |
| } |
| } |
| |
| if c.AllowHeaders != "" { |
| writer.Header().Add(constant.HeaderKeyAccessControlAllowHeaders, c.AllowHeaders) |
| } |
| |
| if c.ExposeHeaders != "" { |
| writer.Header().Add(constant.HeaderKeyAccessControlExposeHeaders, c.ExposeHeaders) |
| } |
| |
| if c.AllowMethods != "" { |
| writer.Header().Add(constant.HeaderKeyAccessControlAllowMethods, c.AllowMethods) |
| } |
| |
| if c.MaxAge != "" { |
| writer.Header().Add(constant.HeaderKeyAccessControlMaxAge, c.MaxAge) |
| } |
| |
| if c.AllowCredentials { |
| writer.Header().Add(constant.HeaderKeyAccessControlAllowCredentials, "true") |
| } |
| if ctx.Request.Method == stdHttp.MethodOptions { |
| ctx.SendLocalReply(stdHttp.StatusOK, nil) |
| return filter.Stop |
| } |
| return filter.Continue |
| } |
| |
| func (factory *FilterFactory) Apply() error { |
| return nil |
| } |
| |
| func (factory *FilterFactory) Config() interface{} { |
| return factory.cfg |
| } |