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uploader.go
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/
uploader.go
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package s3uploader
import (
"bytes"
"encoding/base64"
"fmt"
"github.com/kr/s3/s3util"
"github.com/satori/go.uuid"
"gopkg.in/h2non/filetype.v1"
"io"
"net/http"
"strings"
)
type AwsSettings struct {
AccessKey string
SecretKey string
Bucket string
}
/**
* Get file extension from name
*/
func getFileExtension(file string) string {
split := strings.Split(file, ".")
// Return the last part of the split for the extension
return strings.ToLower(split[len(split)-1])
}
/**
* Upload a file straight to s3 via the multipartreader stream
*/
func Upload(r *http.Request, settings AwsSettings) (string, string, string, string, error) {
var (
isBase64 = false
base64Prefix = ";base64,"
file string
origFile string
ext string
mime string
)
reader, readerErr := r.MultipartReader()
if readerErr != nil {
return "", "", "", "", readerErr
}
// Copy each part to an s3 file (assumes only 1 part)
for {
part, err := reader.NextPart()
if err == io.EOF {
break
}
// Check the mime type
cBuff := make([]byte, 512)
part.Read(cBuff)
// Check if the file part is base 64 encoded.
// If so, strip the type prefix string and re-check
// it's mime type.
if strings.Contains(string(cBuff), base64Prefix) {
isBase64 = true
s := strings.Split(string(cBuff), base64Prefix)
// Remove the prefix slice element
s = append(s[:0], s[1:]...)
sBuff := strings.Join(s, "")
// Add back to buffer with removed prefix
cBuff = []byte(sBuff)
// base 64 decode
decode, _ := base64.StdEncoding.DecodeString(sBuff)
// Check the mime type
kind, _ := filetype.Match([]byte(decode))
mime = kind.MIME.Value
origFile = "file." + kind.Extension
} else {
kind, _ := filetype.Match(cBuff)
mime = kind.MIME.Value
origFile = part.FileName()
}
ext = getFileExtension(origFile)
// Generate a unique file name
file = fmt.Sprintf("%s", uuid.NewV4())
joinedBody := io.MultiReader(bytes.NewReader(cBuff), part)
if isBase64 {
// base64 decode the stream
joinedBody = base64.NewDecoder(base64.StdEncoding, joinedBody)
}
s3util.DefaultConfig.AccessKey = settings.AccessKey
s3util.DefaultConfig.SecretKey = settings.SecretKey
s3File, err := s3util.Create(fmt.Sprintf("http://%s.s3.amazonaws.com/%s.%s", settings.Bucket, file, ext), nil, nil)
if err != nil {
return "", "", "", "", err
}
defer s3File.Close()
io.Copy(s3File, joinedBody)
return file, origFile, ext, mime, nil
}
return file, origFile, ext, mime, nil
}