github.com/google/cloudprober@v0.11.3/common/oauth/oauth.go (about)

     1  // Copyright 2019 The Cloudprober Authors.
     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  /*
    16  Package oauth implements OAuth related utilities for Cloudprober.
    17  */
    18  package oauth
    19  
    20  import (
    21  	"context"
    22  	"fmt"
    23  
    24  	"github.com/google/cloudprober/common/file"
    25  	configpb "github.com/google/cloudprober/common/oauth/proto"
    26  	"github.com/google/cloudprober/logger"
    27  	"golang.org/x/oauth2"
    28  	"golang.org/x/oauth2/google"
    29  )
    30  
    31  // TokenSourceFromConfig builds a oauth2.TokenSource from the provided config.
    32  func TokenSourceFromConfig(c *configpb.Config, l *logger.Logger) (oauth2.TokenSource, error) {
    33  	switch c.Type.(type) {
    34  
    35  	case *configpb.Config_BearerToken:
    36  		return newBearerTokenSource(c.GetBearerToken(), l)
    37  
    38  	case *configpb.Config_GoogleCredentials:
    39  		f := c.GetGoogleCredentials().GetJsonFile()
    40  
    41  		// If JSON file is not provided, try default credentials.
    42  		if f == "" {
    43  			creds, err := google.FindDefaultCredentials(context.Background(), c.GetGoogleCredentials().GetScope()...)
    44  			if err != nil {
    45  				return nil, err
    46  			}
    47  			return creds.TokenSource, nil
    48  		}
    49  
    50  		jsonKey, err := file.ReadFile(f)
    51  		if err != nil {
    52  			return nil, fmt.Errorf("error reading Google Credentials file (%s): %v", f, err)
    53  		}
    54  
    55  		aud := c.GetGoogleCredentials().GetAudience()
    56  		if aud != "" || c.GetGoogleCredentials().GetJwtAsAccessToken() {
    57  			if !c.GetGoogleCredentials().GetJwtAsAccessToken() {
    58  				return nil, fmt.Errorf("oauth: audience (%s) should only be set if jwt_as_access_token is set to true", aud)
    59  			}
    60  			return google.JWTAccessTokenSourceFromJSON(jsonKey, aud)
    61  		}
    62  
    63  		creds, err := google.CredentialsFromJSON(context.Background(), jsonKey, c.GetGoogleCredentials().GetScope()...)
    64  		if err != nil {
    65  			return nil, fmt.Errorf("error parsing Google Credentials file (%s): %v", f, err)
    66  		}
    67  		return creds.TokenSource, nil
    68  	}
    69  
    70  	return nil, fmt.Errorf("unknown oauth credentials type: %v", c.Type)
    71  }