github.com/cs3org/reva/v2@v2.27.7/internal/http/interceptors/auth/credential/strategy/bearer/bearer.go (about)

     1  // Copyright 2018-2021 CERN
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  //
    15  // In applying this license, CERN does not waive the privileges and immunities
    16  // granted to it by virtue of its status as an Intergovernmental Organization
    17  // or submit itself to any jurisdiction.
    18  
    19  package bearer
    20  
    21  import (
    22  	"fmt"
    23  	"net/http"
    24  	"strings"
    25  
    26  	"github.com/cs3org/reva/v2/internal/http/interceptors/auth/credential/registry"
    27  	"github.com/cs3org/reva/v2/pkg/auth"
    28  )
    29  
    30  func init() {
    31  	registry.Register("bearer", New)
    32  }
    33  
    34  type strategy struct{}
    35  
    36  // New returns a new auth strategy that checks "Bearer" OAuth Access Tokens
    37  // See https://tools.ietf.org/html/rfc6750#section-6.1
    38  func New(m map[string]interface{}) (auth.CredentialStrategy, error) {
    39  	return &strategy{}, nil
    40  }
    41  
    42  func (s *strategy) GetCredentials(w http.ResponseWriter, r *http.Request) (*auth.Credentials, error) {
    43  	// 1. check Authorization header
    44  	hdr := r.Header.Get("Authorization")
    45  	token := strings.TrimPrefix(hdr, "Bearer ")
    46  	if token != "" {
    47  		return &auth.Credentials{Type: "bearer", ClientSecret: token}, nil
    48  	}
    49  	// TODO 2. check form encoded body parameter for POST requests, see https://tools.ietf.org/html/rfc6750#section-2.2
    50  
    51  	// 3. check uri query parameter, see https://tools.ietf.org/html/rfc6750#section-2.3
    52  	tokens, ok := r.URL.Query()["access_token"]
    53  	if !ok || len(tokens[0]) < 1 {
    54  		return nil, fmt.Errorf("no bearer auth provided")
    55  	}
    56  	return &auth.Credentials{Type: "bearer", ClientSecret: tokens[0]}, nil
    57  
    58  }
    59  
    60  func (s *strategy) AddWWWAuthenticate(w http.ResponseWriter, r *http.Request, realm string) {
    61  	// TODO read realm from forwarded header?
    62  	if realm == "" {
    63  		// fall back to hostname if not configured
    64  		realm = r.Host
    65  	}
    66  	w.Header().Add("WWW-Authenticate", fmt.Sprintf(`Bearer realm="%s"`, realm))
    67  }