sigs.k8s.io/external-dns@v0.14.1/provider/aws/session.go (about)

     1  /*
     2  Copyright 2023 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package aws
    18  
    19  import (
    20  	"fmt"
    21  	"strings"
    22  
    23  	"github.com/aws/aws-sdk-go/aws"
    24  	"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
    25  	"github.com/aws/aws-sdk-go/aws/request"
    26  	"github.com/aws/aws-sdk-go/aws/session"
    27  	"github.com/linki/instrumented_http"
    28  	"github.com/sirupsen/logrus"
    29  
    30  	"sigs.k8s.io/external-dns/pkg/apis/externaldns"
    31  )
    32  
    33  // AWSSessionConfig contains configuration to create a new AWS provider.
    34  type AWSSessionConfig struct {
    35  	AssumeRole           string
    36  	AssumeRoleExternalID string
    37  	APIRetries           int
    38  }
    39  
    40  func NewSession(awsConfig AWSSessionConfig) (*session.Session, error) {
    41  	config := aws.NewConfig().WithMaxRetries(awsConfig.APIRetries)
    42  
    43  	config.WithHTTPClient(
    44  		instrumented_http.NewClient(config.HTTPClient, &instrumented_http.Callbacks{
    45  			PathProcessor: func(path string) string {
    46  				parts := strings.Split(path, "/")
    47  				return parts[len(parts)-1]
    48  			},
    49  		}),
    50  	)
    51  
    52  	session, err := session.NewSessionWithOptions(session.Options{
    53  		Config:            *config,
    54  		SharedConfigState: session.SharedConfigEnable,
    55  	})
    56  	if err != nil {
    57  		return nil, fmt.Errorf("instantiating AWS session: %w", err)
    58  	}
    59  
    60  	if awsConfig.AssumeRole != "" {
    61  		if awsConfig.AssumeRoleExternalID != "" {
    62  			logrus.Infof("Assuming role: %s with external id %s", awsConfig.AssumeRole, awsConfig.AssumeRoleExternalID)
    63  			session.Config.WithCredentials(stscreds.NewCredentials(session, awsConfig.AssumeRole, func(p *stscreds.AssumeRoleProvider) {
    64  				p.ExternalID = &awsConfig.AssumeRoleExternalID
    65  			}))
    66  		} else {
    67  			logrus.Infof("Assuming role: %s", awsConfig.AssumeRole)
    68  			session.Config.WithCredentials(stscreds.NewCredentials(session, awsConfig.AssumeRole))
    69  		}
    70  	}
    71  
    72  	session.Handlers.Build.PushBack(request.MakeAddToUserAgentHandler("ExternalDNS", externaldns.Version))
    73  
    74  	return session, nil
    75  }