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// Copyright 2017 Vector Creations Ltd
//
// 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 main
import (
"flag"
"fmt"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strings"
"time"
log "github.com/sirupsen/logrus"
)
const usage = `Usage: %s
Create a single endpoint URL which clients can be pointed at.
The client-server API in Dendrite is split across multiple processes
which listen on multiple ports. You cannot point a Matrix client at
any of those ports, as there will be unimplemented functionality.
In addition, all client-server API processes start with the additional
path prefix '/api', which Matrix clients will be unaware of.
This tool will proxy requests for all client-server URLs and forward
them to their respective process. It will also add the '/api' path
prefix to incoming requests.
THIS TOOL IS FOR TESTING AND NOT INTENDED FOR PRODUCTION USE.
Arguments:
`
var (
syncServerURL = flag.String("sync-api-server-url", "", "The base URL of the listening 'dendrite-sync-api-server' process. E.g. 'http://localhost:4200'")
clientAPIURL = flag.String("client-api-server-url", "", "The base URL of the listening 'dendrite-client-api-server' process. E.g. 'http://localhost:4321'")
mediaAPIURL = flag.String("media-api-server-url", "", "The base URL of the listening 'dendrite-media-api-server' process. E.g. 'http://localhost:7779'")
bindAddress = flag.String("bind-address", ":8008", "The listening port for the proxy.")
certFile = flag.String("tls-cert", "", "The PEM formatted X509 certificate to use for TLS")
keyFile = flag.String("tls-key", "", "The PEM private key to use for TLS")
)
func makeProxy(targetURL string) (*httputil.ReverseProxy, error) {
targetURL = strings.TrimSuffix(targetURL, "/")
// Check that we can parse the URL.
_, err := url.Parse(targetURL)
if err != nil {
return nil, err
}
return &httputil.ReverseProxy{
Director: func(req *http.Request) {
// URL.Path() removes the % escaping from the path.
// The % encoding will be added back when the url is encoded
// when the request is forwarded.
// This means that we will lose any unessecary escaping from the URL.
// Pratically this means that any distinction between '%2F' and '/'
// in the URL will be lost by the time it reaches the target.
path := req.URL.Path
log.WithFields(log.Fields{
"path": path,
"url": targetURL,
"method": req.Method,
}).Print("proxying request")
newURL, err := url.Parse(targetURL)
// Set the path separately as we need to preserve '#' characters
// that would otherwise be interpreted as being the start of a URL
// fragment.
newURL.Path += path
if err != nil {
// We already checked that we can parse the URL
// So this shouldn't ever get hit.
panic(err)
}
// Copy the query parameters from the request.
newURL.RawQuery = req.URL.RawQuery
req.URL = newURL
},
}, nil
}
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, usage, os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
if *syncServerURL == "" {
flag.Usage()
fmt.Fprintln(os.Stderr, "no --sync-api-server-url specified.")
os.Exit(1)
}
if *clientAPIURL == "" {
flag.Usage()
fmt.Fprintln(os.Stderr, "no --client-api-server-url specified.")
os.Exit(1)
}
if *mediaAPIURL == "" {
flag.Usage()
fmt.Fprintln(os.Stderr, "no --media-api-server-url specified.")
os.Exit(1)
}
syncProxy, err := makeProxy(*syncServerURL)
if err != nil {
panic(err)
}
clientProxy, err := makeProxy(*clientAPIURL)
if err != nil {
panic(err)
}
mediaProxy, err := makeProxy(*mediaAPIURL)
if err != nil {
panic(err)
}
http.Handle("/_matrix/client/r0/sync", syncProxy)
http.Handle("/_matrix/media/v1/", mediaProxy)
http.Handle("/", clientProxy)
srv := &http.Server{
Addr: *bindAddress,
ReadTimeout: 1 * time.Minute, // how long we wait for the client to send the entire request (after connection accept)
WriteTimeout: 5 * time.Minute, // how long the proxy has to write the full response
}
fmt.Println("Proxying requests to:")
fmt.Println(" /_matrix/client/r0/sync => ", *syncServerURL+"/api/_matrix/client/r0/sync")
fmt.Println(" /_matrix/media/v1 => ", *mediaAPIURL+"/api/_matrix/media/v1")
fmt.Println(" /* => ", *clientAPIURL+"/api/*")
fmt.Println("Listening on ", *bindAddress)
if *certFile != "" && *keyFile != "" {
panic(srv.ListenAndServeTLS(*certFile, *keyFile))
} else {
panic(srv.ListenAndServe())
}
}
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