diff options
Diffstat (limited to 'vendor/github.com/hashicorp/go-getter/get_s3.go')
-rw-r--r-- | vendor/github.com/hashicorp/go-getter/get_s3.go | 243 |
1 files changed, 243 insertions, 0 deletions
diff --git a/vendor/github.com/hashicorp/go-getter/get_s3.go b/vendor/github.com/hashicorp/go-getter/get_s3.go new file mode 100644 index 00000000..d3bffeb1 --- /dev/null +++ b/vendor/github.com/hashicorp/go-getter/get_s3.go @@ -0,0 +1,243 @@ +package getter + +import ( + "fmt" + "io" + "net/url" + "os" + "path/filepath" + "strings" + + "github.com/aws/aws-sdk-go/aws" + "github.com/aws/aws-sdk-go/aws/credentials" + "github.com/aws/aws-sdk-go/aws/credentials/ec2rolecreds" + "github.com/aws/aws-sdk-go/aws/ec2metadata" + "github.com/aws/aws-sdk-go/aws/session" + "github.com/aws/aws-sdk-go/service/s3" +) + +// S3Getter is a Getter implementation that will download a module from +// a S3 bucket. +type S3Getter struct{} + +func (g *S3Getter) ClientMode(u *url.URL) (ClientMode, error) { + // Parse URL + region, bucket, path, _, creds, err := g.parseUrl(u) + if err != nil { + return 0, err + } + + // Create client config + config := g.getAWSConfig(region, creds) + sess := session.New(config) + client := s3.New(sess) + + // List the object(s) at the given prefix + req := &s3.ListObjectsInput{ + Bucket: aws.String(bucket), + Prefix: aws.String(path), + } + resp, err := client.ListObjects(req) + if err != nil { + return 0, err + } + + for _, o := range resp.Contents { + // Use file mode on exact match. + if *o.Key == path { + return ClientModeFile, nil + } + + // Use dir mode if child keys are found. + if strings.HasPrefix(*o.Key, path+"/") { + return ClientModeDir, nil + } + } + + // There was no match, so just return file mode. The download is going + // to fail but we will let S3 return the proper error later. + return ClientModeFile, nil +} + +func (g *S3Getter) Get(dst string, u *url.URL) error { + // Parse URL + region, bucket, path, _, creds, err := g.parseUrl(u) + if err != nil { + return err + } + + // Remove destination if it already exists + _, err = os.Stat(dst) + if err != nil && !os.IsNotExist(err) { + return err + } + + if err == nil { + // Remove the destination + if err := os.RemoveAll(dst); err != nil { + return err + } + } + + // Create all the parent directories + if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil { + return err + } + + config := g.getAWSConfig(region, creds) + sess := session.New(config) + client := s3.New(sess) + + // List files in path, keep listing until no more objects are found + lastMarker := "" + hasMore := true + for hasMore { + req := &s3.ListObjectsInput{ + Bucket: aws.String(bucket), + Prefix: aws.String(path), + } + if lastMarker != "" { + req.Marker = aws.String(lastMarker) + } + + resp, err := client.ListObjects(req) + if err != nil { + return err + } + + hasMore = aws.BoolValue(resp.IsTruncated) + + // Get each object storing each file relative to the destination path + for _, object := range resp.Contents { + lastMarker = aws.StringValue(object.Key) + objPath := aws.StringValue(object.Key) + + // If the key ends with a backslash assume it is a directory and ignore + if strings.HasSuffix(objPath, "/") { + continue + } + + // Get the object destination path + objDst, err := filepath.Rel(path, objPath) + if err != nil { + return err + } + objDst = filepath.Join(dst, objDst) + + if err := g.getObject(client, objDst, bucket, objPath, ""); err != nil { + return err + } + } + } + + return nil +} + +func (g *S3Getter) GetFile(dst string, u *url.URL) error { + region, bucket, path, version, creds, err := g.parseUrl(u) + if err != nil { + return err + } + + config := g.getAWSConfig(region, creds) + sess := session.New(config) + client := s3.New(sess) + return g.getObject(client, dst, bucket, path, version) +} + +func (g *S3Getter) getObject(client *s3.S3, dst, bucket, key, version string) error { + req := &s3.GetObjectInput{ + Bucket: aws.String(bucket), + Key: aws.String(key), + } + if version != "" { + req.VersionId = aws.String(version) + } + + resp, err := client.GetObject(req) + if err != nil { + return err + } + + // Create all the parent directories + if err := os.MkdirAll(filepath.Dir(dst), 0755); err != nil { + return err + } + + f, err := os.Create(dst) + if err != nil { + return err + } + defer f.Close() + + _, err = io.Copy(f, resp.Body) + return err +} + +func (g *S3Getter) getAWSConfig(region string, creds *credentials.Credentials) *aws.Config { + conf := &aws.Config{} + if creds == nil { + // Grab the metadata URL + metadataURL := os.Getenv("AWS_METADATA_URL") + if metadataURL == "" { + metadataURL = "http://169.254.169.254:80/latest" + } + + creds = credentials.NewChainCredentials( + []credentials.Provider{ + &credentials.EnvProvider{}, + &credentials.SharedCredentialsProvider{Filename: "", Profile: ""}, + &ec2rolecreds.EC2RoleProvider{ + Client: ec2metadata.New(session.New(&aws.Config{ + Endpoint: aws.String(metadataURL), + })), + }, + }) + } + + conf.Credentials = creds + if region != "" { + conf.Region = aws.String(region) + } + + return conf +} + +func (g *S3Getter) parseUrl(u *url.URL) (region, bucket, path, version string, creds *credentials.Credentials, err error) { + // Expected host style: s3.amazonaws.com. They always have 3 parts, + // although the first may differ if we're accessing a specific region. + hostParts := strings.Split(u.Host, ".") + if len(hostParts) != 3 { + err = fmt.Errorf("URL is not a valid S3 URL") + return + } + + // Parse the region out of the first part of the host + region = strings.TrimPrefix(strings.TrimPrefix(hostParts[0], "s3-"), "s3") + if region == "" { + region = "us-east-1" + } + + pathParts := strings.SplitN(u.Path, "/", 3) + if len(pathParts) != 3 { + err = fmt.Errorf("URL is not a valid S3 URL") + return + } + + bucket = pathParts[1] + path = pathParts[2] + version = u.Query().Get("version") + + _, hasAwsId := u.Query()["aws_access_key_id"] + _, hasAwsSecret := u.Query()["aws_access_key_secret"] + _, hasAwsToken := u.Query()["aws_access_token"] + if hasAwsId || hasAwsSecret || hasAwsToken { + creds = credentials.NewStaticCredentials( + u.Query().Get("aws_access_key_id"), + u.Query().Get("aws_access_key_secret"), + u.Query().Get("aws_access_token"), + ) + } + + return +} |