terraform/backend/remote-state/s3/backend.go

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package s3
import (
"context"
"github.com/aws/aws-sdk-go/service/dynamodb"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/schema"
terraformAWS "github.com/hashicorp/terraform/builtin/providers/aws"
)
// New creates a new backend for S3 remote state.
func New() backend.Backend {
s := &schema.Backend{
Schema: map[string]*schema.Schema{
"bucket": {
Type: schema.TypeString,
Required: true,
Description: "The name of the S3 bucket",
},
"key": {
Type: schema.TypeString,
Required: true,
Description: "The path to the state file inside the bucket",
},
"region": {
Type: schema.TypeString,
Required: true,
Description: "The region of the S3 bucket.",
DefaultFunc: schema.EnvDefaultFunc("AWS_DEFAULT_REGION", nil),
},
"endpoint": {
Type: schema.TypeString,
Optional: true,
Description: "A custom endpoint for the S3 API",
DefaultFunc: schema.EnvDefaultFunc("AWS_S3_ENDPOINT", ""),
},
"encrypt": {
Type: schema.TypeBool,
Optional: true,
Description: "Whether to enable server side encryption of the state file",
Default: false,
},
"acl": {
Type: schema.TypeString,
Optional: true,
Description: "Canned ACL to be applied to the state file",
Default: "",
},
"access_key": {
Type: schema.TypeString,
Optional: true,
Description: "AWS access key",
Default: "",
},
"secret_key": {
Type: schema.TypeString,
Optional: true,
Description: "AWS secret key",
Default: "",
},
"kms_key_id": {
Type: schema.TypeString,
Optional: true,
Description: "The ARN of a KMS Key to use for encrypting the state",
Default: "",
},
"lock_table": {
Type: schema.TypeString,
Optional: true,
Description: "DynamoDB table for state locking",
Default: "",
Deprecated: "please use the dynamodb_table attribute",
},
"dynamodb_table": {
Type: schema.TypeString,
Optional: true,
Description: "DynamoDB table for state locking and consistency",
Default: "",
},
"profile": {
Type: schema.TypeString,
Optional: true,
Description: "AWS profile name",
Default: "",
},
"shared_credentials_file": {
Type: schema.TypeString,
Optional: true,
Description: "Path to a shared credentials file",
Default: "",
},
"token": {
Type: schema.TypeString,
Optional: true,
Description: "MFA token",
Default: "",
},
"role_arn": {
Type: schema.TypeString,
Optional: true,
Description: "The role to be assumed",
Default: "",
},
"session_name": {
Type: schema.TypeString,
Optional: true,
Description: "The session name to use when assuming the role.",
Default: "",
},
"external_id": {
Type: schema.TypeString,
Optional: true,
Description: "The external ID to use when assuming the role",
Default: "",
},
"assume_role_policy": {
Type: schema.TypeString,
Optional: true,
Description: "The permissions applied when assuming a role.",
Default: "",
},
},
}
result := &Backend{Backend: s}
result.Backend.ConfigureFunc = result.configure
return result
}
type Backend struct {
*schema.Backend
// The fields below are set from configure
s3Client *s3.S3
dynClient *dynamodb.DynamoDB
bucketName string
keyName string
serverSideEncryption bool
acl string
kmsKeyID string
ddbTable string
}
func (b *Backend) configure(ctx context.Context) error {
if b.s3Client != nil {
return nil
}
// Grab the resource data
data := schema.FromContextBackendConfig(ctx)
b.bucketName = data.Get("bucket").(string)
b.keyName = data.Get("key").(string)
b.serverSideEncryption = data.Get("encrypt").(bool)
b.acl = data.Get("acl").(string)
b.kmsKeyID = data.Get("kms_key_id").(string)
b.ddbTable = data.Get("dynamodb_table").(string)
if b.ddbTable == "" {
// try the depracted field
b.ddbTable = data.Get("lock_table").(string)
}
cfg := &terraformAWS.Config{
AccessKey: data.Get("access_key").(string),
AssumeRoleARN: data.Get("role_arn").(string),
AssumeRoleExternalID: data.Get("external_id").(string),
AssumeRolePolicy: data.Get("assume_role_policy").(string),
AssumeRoleSessionName: data.Get("session_name").(string),
CredsFilename: data.Get("shared_credentials_file").(string),
Profile: data.Get("profile").(string),
Region: data.Get("region").(string),
S3Endpoint: data.Get("endpoint").(string),
SecretKey: data.Get("secret_key").(string),
Token: data.Get("token").(string),
}
client, err := cfg.Client()
if err != nil {
return err
}
b.s3Client = client.(*terraformAWS.AWSClient).S3()
b.dynClient = client.(*terraformAWS.AWSClient).DynamoDB()
return nil
}