91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
/*
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Copyright 2021 The Dapr Authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package routeralias
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/dapr/components-contrib/middleware"
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"github.com/dapr/kit/logger"
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"github.com/gorilla/mux"
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)
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type contextKey int
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const varsKey contextKey = iota
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// Middleware is an routeralias middleware.
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type Middleware struct {
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logger logger.Logger
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router *mux.Router
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}
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// NewMiddleware returns a new routerchecker middleware.
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func NewMiddleware(logger logger.Logger) middleware.Middleware {
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return &Middleware{logger: logger}
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}
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// GetHandler retruns the HTTP handler provided by the middleware.
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func (m *Middleware) GetHandler(metadata middleware.Metadata) (
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func(next http.Handler) http.Handler, error,
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) {
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if err := m.getNativeMetadata(metadata); err != nil {
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return nil, err
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}
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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var match mux.RouteMatch
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if m.router.Match(r, &match) {
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ctx := context.WithValue(r.Context(), varsKey, match.Vars)
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r = r.WithContext(ctx)
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match.Handler.ServeHTTP(w, r)
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}
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next.ServeHTTP(w, r)
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})
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}, nil
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}
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func (m *Middleware) getNativeMetadata(metadata middleware.Metadata) error {
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m.router = mux.NewRouter()
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for key, value := range metadata.Properties {
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m.router.Handle(key, m.routerConvert(value))
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}
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return nil
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}
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func (m *Middleware) routerConvert(daprRouter string) http.Handler {
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return http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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params := vars(req)
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vals := req.URL.Query()
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for key, val := range params {
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vals.Add(key, val)
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}
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req.URL.RawQuery = vals.Encode()
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req.URL.Path = daprRouter
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req.RequestURI = fmt.Sprintf("%s?%s", daprRouter, req.URL.RawQuery)
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})
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}
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// vars returns the route variables for the current request, if any.
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func vars(r *http.Request) map[string]string {
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if rv := r.Context().Value(varsKey); rv != nil {
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return rv.(map[string]string)
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}
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return nil
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}
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