github.com/kyma-incubator/compass/components/director@v0.0.0-20230623144113-d764f56ff805/internal/authenticator/jwks_fetch.go (about)

     1  package authenticator
     2  
     3  import (
     4  	"context"
     5  	"io"
     6  	"net/url"
     7  	"os"
     8  	"strings"
     9  
    10  	"github.com/kyma-incubator/compass/components/director/pkg/log"
    11  
    12  	"github.com/lestrrat-go/jwx/jwk"
    13  	"github.com/pkg/errors"
    14  )
    15  
    16  /**
    17  Copied from github.com/lestrrat-go/jwx/jwk/jwk.go & modified loading files
    18  
    19  The MIT License (MIT)
    20  
    21  Copyright (c) 2015 lestrrat
    22  
    23  Permission is hereby granted, free of charge, to any person obtaining a copy
    24  of this software and associated documentation files (the "Software"), to deal
    25  in the Software without restriction, including without limitation the rights
    26  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    27  copies of the Software, and to permit persons to whom the Software is
    28  furnished to do so, subject to the following conditions:
    29  
    30  The above copyright notice and this permission notice shall be included in all
    31  copies or substantial portions of the Software.
    32  
    33  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    34  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    35  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    36  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    37  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    38  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    39  SOFTWARE.
    40  
    41  */
    42  
    43  // FetchJWK fetches a JWK resource specified by a URL
    44  func FetchJWK(ctx context.Context, urlstring string, options ...jwk.FetchOption) (jwk.Set, error) {
    45  	u, err := url.Parse(urlstring)
    46  	if err != nil {
    47  		return nil, errors.Wrap(err, "failed to parse url")
    48  	}
    49  
    50  	switch u.Scheme {
    51  	case "http", "https":
    52  		return jwk.Fetch(ctx, urlstring, options...)
    53  	case "file":
    54  		filePath := strings.TrimPrefix(urlstring, "file://")
    55  		f, err := os.Open(filePath)
    56  		if err != nil {
    57  			return nil, errors.Wrap(err, "failed to open jwk file")
    58  		}
    59  		defer func() {
    60  			err := f.Close()
    61  			if err != nil {
    62  				log.C(ctx).WithError(err).Errorf("An error has occurred while closing file: %v", err)
    63  			}
    64  		}()
    65  
    66  		buf, err := io.ReadAll(f)
    67  		if err != nil {
    68  			return nil, errors.Wrap(err, "failed read content from jwk file")
    69  		}
    70  		return jwk.Parse(buf)
    71  	}
    72  	return nil, errors.Errorf("invalid url scheme %s", u.Scheme)
    73  }