dendrite/src/github.com/matrix-org/dendrite/clientapi/auth/auth.go

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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 auth
import (
"fmt"
"net/http"
"strings"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/util"
)
// VerifyAccessToken verifies that an access token was supplied in the given HTTP request
// and returns the user ID it corresponds to. Returns resErr (an error response which can be
// sent to the client) if the token is invalid or there was a problem querying the database.
func VerifyAccessToken(req *http.Request) (userID string, resErr *util.JSONResponse) {
token, tokenErr := extractAccessToken(req)
if tokenErr != nil {
resErr = &util.JSONResponse{
Code: 401,
JSON: jsonerror.MissingToken(tokenErr.Error()),
}
return
}
if token == "fail" {
res := util.ErrorResponse(fmt.Errorf("Fatal error"))
resErr = &res
}
// TODO: Check the token against the database
userID = token
return
}
// extractAccessToken from a request, or return an error detailing what went wrong. The
// error message MUST be human-readable and comprehensible to the client.
func extractAccessToken(req *http.Request) (string, error) {
// cf https://github.com/matrix-org/synapse/blob/v0.19.2/synapse/api/auth.py#L631
authBearer := req.Header.Get("Authorization")
queryToken := req.URL.Query().Get("access_token")
if authBearer != "" && queryToken != "" {
return "", fmt.Errorf("mixing Authorization headers and access_token query parameters")
}
if queryToken != "" {
return queryToken, nil
}
if authBearer != "" {
parts := strings.SplitN(authBearer, " ", 2)
if len(parts) != 2 || parts[0] != "Bearer" {
return "", fmt.Errorf("invalid Authorization header")
}
return parts[1], nil
}
return "", fmt.Errorf("missing access token")
}