mautrix-whatsapp/vendor/maunium.net/go/mautrix-appservice/http.go
Tulir Asokan a6ebc50f6d Add dep
2018-08-26 17:29:51 +03:00

153 lines
3.5 KiB
Go

package appservice
import (
"encoding/json"
"io/ioutil"
"net/http"
"github.com/gorilla/mux"
"context"
"time"
)
// Listen starts the HTTP server that listens for calls from the Matrix homeserver.
func (as *AppService) Start() {
r := mux.NewRouter()
r.HandleFunc("/transactions/{txnID}", as.PutTransaction).Methods(http.MethodPut)
r.HandleFunc("/rooms/{roomAlias}", as.GetRoom).Methods(http.MethodGet)
r.HandleFunc("/users/{userID}", as.GetUser).Methods(http.MethodGet)
var err error
as.server = &http.Server{
Addr: as.Host.Address(),
Handler: r,
}
as.Log.Infoln("Listening on", as.Host.Address())
if len(as.Host.TLSCert) == 0 || len(as.Host.TLSKey) == 0 {
err = as.server.ListenAndServe()
} else {
err = as.server.ListenAndServeTLS(as.Host.TLSCert, as.Host.TLSKey)
}
if err != nil && err.Error() != "http: Server closed" {
as.Log.Fatalln("Error while listening:", err)
} else {
as.Log.Debugln("Listener stopped.")
}
}
func (as *AppService) Stop() {
if as.server == nil {
return
}
ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)
as.server.Shutdown(ctx)
as.server = nil
}
// CheckServerToken checks if the given request originated from the Matrix homeserver.
func (as *AppService) CheckServerToken(w http.ResponseWriter, r *http.Request) bool {
query := r.URL.Query()
val, ok := query["access_token"]
if !ok {
Error{
ErrorCode: ErrForbidden,
HTTPStatus: http.StatusForbidden,
Message: "Bad token supplied.",
}.Write(w)
return false
}
for _, str := range val {
return str == as.Registration.ServerToken
}
return false
}
// PutTransaction handles a /transactions PUT call from the homeserver.
func (as *AppService) PutTransaction(w http.ResponseWriter, r *http.Request) {
if !as.CheckServerToken(w, r) {
return
}
vars := mux.Vars(r)
txnID := vars["txnID"]
if len(txnID) == 0 {
Error{
ErrorCode: ErrNoTransactionID,
HTTPStatus: http.StatusBadRequest,
Message: "Missing transaction ID.",
}.Write(w)
return
}
defer r.Body.Close()
body, err := ioutil.ReadAll(r.Body)
if err != nil || len(body) == 0 {
Error{
ErrorCode: ErrNoBody,
HTTPStatus: http.StatusBadRequest,
Message: "Missing request body.",
}.Write(w)
return
}
if as.lastProcessedTransaction == txnID {
// Duplicate transaction ID: no-op
WriteBlankOK(w)
return
}
eventList := EventList{}
err = json.Unmarshal(body, &eventList)
if err != nil {
Error{
ErrorCode: ErrInvalidJSON,
HTTPStatus: http.StatusBadRequest,
Message: "Failed to parse body JSON.",
}.Write(w)
return
}
for _, event := range eventList.Events {
as.Log.Debugln("Received event", event.ID)
as.UpdateState(event)
as.Events <- event
}
as.lastProcessedTransaction = txnID
WriteBlankOK(w)
}
// GetRoom handles a /rooms GET call from the homeserver.
func (as *AppService) GetRoom(w http.ResponseWriter, r *http.Request) {
if !as.CheckServerToken(w, r) {
return
}
vars := mux.Vars(r)
roomAlias := vars["roomAlias"]
ok := as.QueryHandler.QueryAlias(roomAlias)
if ok {
WriteBlankOK(w)
} else {
Error{
ErrorCode: ErrUnknown,
HTTPStatus: http.StatusNotFound,
}.Write(w)
}
}
// GetUser handles a /users GET call from the homeserver.
func (as *AppService) GetUser(w http.ResponseWriter, r *http.Request) {
if !as.CheckServerToken(w, r) {
return
}
vars := mux.Vars(r)
userID := vars["userID"]
ok := as.QueryHandler.QueryUser(userID)
if ok {
WriteBlankOK(w)
} else {
Error{
ErrorCode: ErrUnknown,
HTTPStatus: http.StatusNotFound,
}.Write(w)
}
}