vikunja-api/pkg/utils/write_to_zip.go

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// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public Licensee as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public Licensee for more details.
//
// You should have received a copy of the GNU Affero General Public Licensee
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package utils
import (
"archive/zip"
"fmt"
"io"
"strconv"
)
// Change to deflate to gain better compression
// see http://golang.org/pkg/archive/zip/#pkg-constants
const CompressionUsed = zip.Deflate
func WriteBytesToZip(filename string, data []byte, writer *zip.Writer) (err error) {
header := &zip.FileHeader{
Name: filename,
Method: CompressionUsed,
}
w, err := writer.CreateHeader(header)
if err != nil {
return err
}
_, err = w.Write(data)
return
}
// WriteFilesToZip writes a bunch of files from the db to a zip file. It exprects a map with the file id
// as key and its content as io.ReadCloser.
func WriteFilesToZip(files map[int64]io.ReadCloser, wr *zip.Writer) (err error) {
for fid, file := range files {
header := &zip.FileHeader{
Name: "files/" + strconv.FormatInt(fid, 10),
Method: CompressionUsed,
}
w, err := wr.CreateHeader(header)
if err != nil {
return err
}
_, err = io.Copy(w, file)
if err != nil {
return fmt.Errorf("error writing file %d: %s", fid, err)
}
_ = file.Close()
}
return nil
}