github.com/minamijoyo/terraform@v0.7.8-0.20161029001309-18b3736ba44b/state/remote/s3.go (about)

     1  package remote
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  	"io"
     7  	"log"
     8  	"os"
     9  	"strconv"
    10  
    11  	"github.com/aws/aws-sdk-go/aws"
    12  	"github.com/aws/aws-sdk-go/aws/awserr"
    13  	"github.com/aws/aws-sdk-go/aws/session"
    14  	"github.com/aws/aws-sdk-go/service/s3"
    15  	"github.com/hashicorp/go-cleanhttp"
    16  	"github.com/hashicorp/go-multierror"
    17  	terraformAws "github.com/hashicorp/terraform/builtin/providers/aws"
    18  )
    19  
    20  func s3Factory(conf map[string]string) (Client, error) {
    21  	bucketName, ok := conf["bucket"]
    22  	if !ok {
    23  		return nil, fmt.Errorf("missing 'bucket' configuration")
    24  	}
    25  
    26  	keyName, ok := conf["key"]
    27  	if !ok {
    28  		return nil, fmt.Errorf("missing 'key' configuration")
    29  	}
    30  
    31  	endpoint, ok := conf["endpoint"]
    32  	if !ok {
    33  		endpoint = os.Getenv("AWS_S3_ENDPOINT")
    34  	}
    35  
    36  	regionName, ok := conf["region"]
    37  	if !ok {
    38  		regionName = os.Getenv("AWS_DEFAULT_REGION")
    39  		if regionName == "" {
    40  			return nil, fmt.Errorf(
    41  				"missing 'region' configuration or AWS_DEFAULT_REGION environment variable")
    42  		}
    43  	}
    44  
    45  	serverSideEncryption := false
    46  	if raw, ok := conf["encrypt"]; ok {
    47  		v, err := strconv.ParseBool(raw)
    48  		if err != nil {
    49  			return nil, fmt.Errorf(
    50  				"'encrypt' field couldn't be parsed as bool: %s", err)
    51  		}
    52  
    53  		serverSideEncryption = v
    54  	}
    55  
    56  	acl := ""
    57  	if raw, ok := conf["acl"]; ok {
    58  		acl = raw
    59  	}
    60  	kmsKeyID := conf["kms_key_id"]
    61  
    62  	var errs []error
    63  	creds, err := terraformAws.GetCredentials(&terraformAws.Config{
    64  		AccessKey:     conf["access_key"],
    65  		SecretKey:     conf["secret_key"],
    66  		Token:         conf["token"],
    67  		Profile:       conf["profile"],
    68  		CredsFilename: conf["shared_credentials_file"],
    69  	})
    70  	// Call Get to check for credential provider. If nothing found, we'll get an
    71  	// error, and we can present it nicely to the user
    72  	_, err = creds.Get()
    73  	if err != nil {
    74  		if awsErr, ok := err.(awserr.Error); ok && awsErr.Code() == "NoCredentialProviders" {
    75  			errs = append(errs, fmt.Errorf(`No valid credential sources found for AWS S3 remote.
    76  Please see https://www.terraform.io/docs/state/remote/s3.html for more information on
    77  providing credentials for the AWS S3 remote`))
    78  		} else {
    79  			errs = append(errs, fmt.Errorf("Error loading credentials for AWS S3 remote: %s", err))
    80  		}
    81  		return nil, &multierror.Error{Errors: errs}
    82  	}
    83  
    84  	awsConfig := &aws.Config{
    85  		Credentials: creds,
    86  		Endpoint:    aws.String(endpoint),
    87  		Region:      aws.String(regionName),
    88  		HTTPClient:  cleanhttp.DefaultClient(),
    89  	}
    90  	sess := session.New(awsConfig)
    91  	nativeClient := s3.New(sess)
    92  
    93  	return &S3Client{
    94  		nativeClient:         nativeClient,
    95  		bucketName:           bucketName,
    96  		keyName:              keyName,
    97  		serverSideEncryption: serverSideEncryption,
    98  		acl:                  acl,
    99  		kmsKeyID:             kmsKeyID,
   100  	}, nil
   101  }
   102  
   103  type S3Client struct {
   104  	nativeClient         *s3.S3
   105  	bucketName           string
   106  	keyName              string
   107  	serverSideEncryption bool
   108  	acl                  string
   109  	kmsKeyID             string
   110  }
   111  
   112  func (c *S3Client) Get() (*Payload, error) {
   113  	output, err := c.nativeClient.GetObject(&s3.GetObjectInput{
   114  		Bucket: &c.bucketName,
   115  		Key:    &c.keyName,
   116  	})
   117  
   118  	if err != nil {
   119  		if awserr := err.(awserr.Error); awserr != nil {
   120  			if awserr.Code() == "NoSuchKey" {
   121  				return nil, nil
   122  			} else {
   123  				return nil, err
   124  			}
   125  		} else {
   126  			return nil, err
   127  		}
   128  	}
   129  
   130  	defer output.Body.Close()
   131  
   132  	buf := bytes.NewBuffer(nil)
   133  	if _, err := io.Copy(buf, output.Body); err != nil {
   134  		return nil, fmt.Errorf("Failed to read remote state: %s", err)
   135  	}
   136  
   137  	payload := &Payload{
   138  		Data: buf.Bytes(),
   139  	}
   140  
   141  	// If there was no data, then return nil
   142  	if len(payload.Data) == 0 {
   143  		return nil, nil
   144  	}
   145  
   146  	return payload, nil
   147  }
   148  
   149  func (c *S3Client) Put(data []byte) error {
   150  	contentType := "application/json"
   151  	contentLength := int64(len(data))
   152  
   153  	i := &s3.PutObjectInput{
   154  		ContentType:   &contentType,
   155  		ContentLength: &contentLength,
   156  		Body:          bytes.NewReader(data),
   157  		Bucket:        &c.bucketName,
   158  		Key:           &c.keyName,
   159  	}
   160  
   161  	if c.serverSideEncryption {
   162  		if c.kmsKeyID != "" {
   163  			i.SSEKMSKeyId = &c.kmsKeyID
   164  			i.ServerSideEncryption = aws.String("aws:kms")
   165  		} else {
   166  			i.ServerSideEncryption = aws.String("AES256")
   167  		}
   168  	}
   169  
   170  	if c.acl != "" {
   171  		i.ACL = aws.String(c.acl)
   172  	}
   173  
   174  	log.Printf("[DEBUG] Uploading remote state to S3: %#v", i)
   175  
   176  	if _, err := c.nativeClient.PutObject(i); err == nil {
   177  		return nil
   178  	} else {
   179  		return fmt.Errorf("Failed to upload state: %v", err)
   180  	}
   181  }
   182  
   183  func (c *S3Client) Delete() error {
   184  	_, err := c.nativeClient.DeleteObject(&s3.DeleteObjectInput{
   185  		Bucket: &c.bucketName,
   186  		Key:    &c.keyName,
   187  	})
   188  
   189  	return err
   190  }