Merge pull request #46 from libdns/opts

fix: use environment variables to initialize provider

client.go

@@ -26,28 +26,42 @@ func (p *Provider) init(ctx context.Context) {
 	if p.MaxRetries == 0 {
 		p.MaxRetries = 5
 	}
-	if p.Region == "" {
-		p.Region = "us-east-1"
-	}
 	if p.MaxWaitDur == 0 {
 		p.MaxWaitDur = time.Minute
 	}
 
 	opts := make([]func(*config.LoadOptions) error, 0)
 	opts = append(opts,
-		config.WithSharedConfigProfile(p.AWSProfile),
-		config.WithRegion(p.Region),
 		config.WithRetryer(func() aws.Retryer {
 			return retry.AddWithMaxAttempts(retry.NewStandard(), p.MaxRetries)
 		}),
 	)
+
+	profile := p.Profile
+	if profile == "" {
+		profile = p.AWSProfile
+	}
+
+	if profile != "" {
+		opts = append(opts, config.WithSharedConfigProfile(profile))
+	}
+
+	if p.Region != "" {
+		opts = append(opts, config.WithRegion(p.Region))
+	}
+
 	if p.AccessKeyId != "" && p.SecretAccessKey != "" {
+		token := p.SessionToken
+		if token == "" {
+			token = p.Token
+		}
+
 		opts = append(opts,
-			config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(p.AccessKeyId, p.SecretAccessKey, p.Token)),
+			config.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(p.AccessKeyId, p.SecretAccessKey, token)),
 		)
 	}
-	cfg, err := config.LoadDefaultConfig(ctx, opts...)
 
+	cfg, err := config.LoadDefaultConfig(ctx, opts...)
 	if err != nil {
 		log.Fatalf("route53: unable to load AWS SDK config, %v", err)
 	}
@@ -148,7 +162,7 @@ func marshalRecord(record libdns.Record) []types.ResourceRecord {
 	return resourceRecords
 }
 
-func (p *Provider) getRecords(ctx context.Context, zoneID string, zone string) ([]libdns.Record, error) {
+func (p *Provider) getRecords(ctx context.Context, zoneID string, _ string) ([]libdns.Record, error) {
 	getRecordsInput := &r53.ListResourceRecordSetsInput{
 		HostedZoneId: aws.String(zoneID),
 		MaxItems:     aws.Int32(1000),

provider.go

@@ -8,17 +8,56 @@ import (
 	"github.com/libdns/libdns"
 )
 
-// Provider implements the libdns interfaces for Route53
+// Provider implements the libdns interfaces for Route53.
+//
+// By default, the provider loads the AWS configuration from the environment.
+// To override these values, set the fields in the Provider struct.
 type Provider struct {
-	MaxRetries         int           `json:"max_retries,omitempty"`
-	MaxWaitDur         time.Duration `json:"max_wait_dur,omitempty"`
-	WaitForPropagation bool          `json:"wait_for_propagation,omitempty"`
-	Region             string        `json:"region,omitempty"`
-	AWSProfile         string        `json:"aws_profile,omitempty"`
-	AccessKeyId        string        `json:"access_key_id,omitempty"`
-	SecretAccessKey    string        `json:"secret_access_key,omitempty"`
-	Token              string        `json:"token,omitempty"`
-	client             *r53.Client
+	client *r53.Client
+
+	// Region is the AWS Region to use. If not set, it will use AWS_REGION
+	// environment variable.
+	Region string `json:"region,omitempty"`
+
+	// AWSProfile is the AWS Profile to use. If not set, it will use
+	// AWS_PROFILE environment variable.
+	//
+	// Deprecated: Use Profile instead
+	AWSProfile string `json:"aws_profile,omitempty"`
+
+	// AWSProfile is the AWS Profile to use. If not set, it will use
+	// AWS_PROFILE environment variable.
+	Profile string `json:"profile,omitempty"`
+
+	// AccessKeyId is the AWS Access Key ID to use. If not set, it will use
+	// AWS_ACCESS_KEY_ID
+	AccessKeyId string `json:"access_key_id,omitempty"`
+
+	// SecretAccessKey is the AWS Secret Access Key to use. If not set, it will use
+	// AWS_SECRET_ACCESS_KEY environment variable.
+	SecretAccessKey string `json:"secret_access_key,omitempty"`
+
+	// Token is the AWS Session Token to use. If not set, it will use
+	// AWS_SESSION_TOKEN environment variable.
+	//
+	// Deprecated: Use SessionToken instead.
+	Token string `json:"token,omitempty"`
+
+	// SessionToken is the AWS Session Token to use. If not set, it will use
+	// AWS_SESSION_TOKEN environment variable.
+	SessionToken string `json:"session_token,omitempty"`
+
+	// MaxRetries is the maximum number of retries to make when a request
+	// fails. If not set, it will use 5 retries.
+	MaxRetries int `json:"max_retries,omitempty"`
+
+	// MaxWaitDur is the maximum amount of time to wait for a record to be
+	// propagated. If not set, it will use 1 minutes.
+	MaxWaitDur time.Duration `json:"max_wait_dur,omitempty"`
+
+	// WaitForPropagation if set to true, it will wait for the record to be
+	// propagated before returning.
+	WaitForPropagation bool `json:"wait_for_propagation,omitempty"`
 }
 
 // GetRecords lists all the records in the zone.