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// Copyright 2021-2023 The Connect Authors
//
// Licensed 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 connect_test
import (
"errors"
"io"
"log"
"net/http"
connect "connectrpc.com/connect"
)
// NewHelloHandler is an example HTTP handler. In a real application, it might
// handle RPCs, requests for HTML, or anything else.
func NewHelloHandler() http.Handler {
return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
io.WriteString(response, "Hello, world!")
})
}
// NewAuthenticatedHandler is an example of middleware that works with both RPC
// and non-RPC clients.
func NewAuthenticatedHandler(handler http.Handler) http.Handler {
errorWriter := connect.NewErrorWriter()
return http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
// Dummy authentication logic.
if request.Header.Get("Token") == "super-secret" {
handler.ServeHTTP(response, request)
return
}
defer request.Body.Close()
defer io.Copy(io.Discard, request.Body)
if errorWriter.IsSupported(request) {
// Send a protocol-appropriate error to RPC clients, so that they receive
// the right code, message, and any metadata or error details.
unauthenticated := connect.NewError(connect.CodeUnauthenticated, errors.New("invalid token"))
errorWriter.Write(response, request, unauthenticated)
} else {
// Send an error to non-RPC clients.
response.WriteHeader(http.StatusUnauthorized)
io.WriteString(response, "invalid token")
}
})
}
func ExampleErrorWriter() {
mux := http.NewServeMux()
mux.Handle("/", NewHelloHandler())
srv := &http.Server{
Addr: ":8080",
Handler: NewAuthenticatedHandler(mux),
}
if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
log.Fatalln(err)
}
}
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