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parser.go
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/
parser.go
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package baraka
import (
"bytes"
"io"
"mime/multipart"
"net/http"
)
// Parser is an interface which determine which method to use when parsing multipart files
type Parser interface {
Parse(maxFileSize int64, maxFileCount int64, r *http.Request) (Saver, error)
}
// Options implements the Parser interface
// filter function runs when parsing the file
type Options struct {
Filter func(data *multipart.Part) bool
}
// Parse @ parses with multipart.Reader()
func (options Options) Parse(maxFileSize int64, maxFileCount int64, r *http.Request) (Saver, error) {
reader, err := r.MultipartReader()
if err != nil {
return nil, err
}
// reserve an additional 2 MB for non-file parts.
maxFileSize += int64(2 << 20)
var parts Parts
for {
part, err := reader.NextPart()
if err != nil || err == io.EOF {
if err == io.EOF {
break
}
return nil, err
}
fileName := part.FileName()
if options.Filter != nil {
// execute filter function
ok := options.Filter(part)
if !ok {
continue
}
}
var b bytes.Buffer
fh := &Header{
Filename: fileName,
Header: part.Header,
}
n, err := io.CopyN(&b, part, maxFileSize+1)
if err != nil && err != io.EOF {
return nil, err
}
if n > maxFileSize {
continue
}
fh.content = b.Bytes()
fh.Size = int64(len(fh.content))
parts.files = append(parts.files, fh)
parts.len++
if len := int64(parts.len); len == maxFileCount && len != 0 {
break
}
}
return &parts, nil
}