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s3.go
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s3.go
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package s3push
import (
"fmt"
"github.com/aws/aws-sdk-go/service/s3"
"os"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
)
const cannedAclPublicRead = "public-read"
const cannedAclPrivate = "private"
// S3Uploader manages S3 uploads to a specific bucket
type S3Uploader struct {
bucketName *string
prefix string
public bool
s3Uploader *s3manager.Uploader
s3Svc *s3.S3
mimeGuesser mimeTypeGuesser
}
type mimeTypeGuesser interface {
init() error
mimeTypeFromPath(string) (string, error)
close()
}
// InitS3Uploader initializes a new S3Uploader
func InitS3Uploader(config repoConfig) (*S3Uploader, error) {
uploader := new(S3Uploader)
uploader.bucketName = aws.String(config.S3Bucket)
uploader.public = config.Public
uploader.prefix = config.Prefix
if len(uploader.prefix) > 0 && uploader.prefix[len(uploader.prefix)-1:] != "/" {
uploader.prefix = uploader.prefix + "/"
}
s3config := aws.Config{Region: aws.String(config.S3Region)}
s3Session, err := session.NewSession(&s3config)
if err != nil {
return nil, err
}
uploader.s3Uploader = s3manager.NewUploader(s3Session)
uploader.s3Svc = s3.New(s3Session)
uploader.mimeGuesser = newMimeGuesser()
err = uploader.mimeGuesser.init()
if err != nil {
return nil, err
}
return uploader, nil
}
func (uploader S3Uploader) deleteFile(path string) error {
key := aws.String(uploader.prefix + path)
_, err := uploader.s3Svc.DeleteObject(&s3.DeleteObjectInput{
Bucket: uploader.bucketName,
Key: key,
})
if err != nil {
return err
}
err = uploader.s3Svc.WaitUntilObjectNotExists(&s3.HeadObjectInput{
Bucket: uploader.bucketName,
Key: key,
})
return err
}
// UploadFile uploads a file to S3
func (uploader S3Uploader) UploadFile(path string) error {
if _, err := os.Stat(path); os.IsNotExist(err) {
// Uploading a file which does not exist means delete it
return uploader.deleteFile(path)
}
file, err := os.Open(path)
if err != nil {
return err
}
contentType, err := uploader.mimeGuesser.mimeTypeFromPath(path)
if err != nil {
fmt.Println("Couldn't automatically determine content type of ", path, err)
contentType = "text/plain"
}
var acl string
if uploader.public {
acl = cannedAclPublicRead
} else {
acl = cannedAclPrivate
}
result, err := uploader.s3Uploader.Upload(&s3manager.UploadInput{
Body: file,
Bucket: uploader.bucketName,
Key: aws.String(uploader.prefix + path),
ContentType: &contentType,
ACL: &acl,
})
if err != nil {
return err
}
fmt.Println(result.Location)
return nil
}
// Close cleans up the uploader
func (uploader S3Uploader) Close() {
uploader.mimeGuesser.close()
}