mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 04:36:43 +00:00
97 lines
2.1 KiB
Go
97 lines
2.1 KiB
Go
// Copyright (c) 2021 Proton Technologies AG
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//
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// This file is part of ProtonMail Bridge.
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//
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// ProtonMail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ProtonMail Bridge is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with ProtonMail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package message
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import (
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"bufio"
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"bytes"
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"errors"
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"io"
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)
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type partScanner struct {
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r *bufio.Reader
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boundary string
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progress int
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}
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type part struct {
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b []byte
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offset int
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}
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func newPartScanner(r io.Reader, boundary string) (*partScanner, error) {
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scanner := &partScanner{r: bufio.NewReader(r), boundary: boundary}
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if _, _, err := scanner.readToBoundary(); err != nil {
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return nil, err
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}
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return scanner, nil
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}
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func (s *partScanner) scanAll() ([]part, error) {
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var parts []part
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for {
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offset := s.progress
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b, more, err := s.readToBoundary()
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if err != nil {
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return nil, err
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}
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if !more {
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return parts, nil
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}
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parts = append(parts, part{b: b, offset: offset})
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}
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}
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func (s *partScanner) readToBoundary() ([]byte, bool, error) {
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var res []byte
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for {
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line, err := s.r.ReadBytes('\n')
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if err != nil {
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if !errors.Is(err, io.EOF) {
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return nil, false, err
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}
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if len(line) == 0 {
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return nil, false, nil
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}
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}
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s.progress += len(line)
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switch {
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case bytes.HasPrefix(bytes.TrimSpace(line), []byte("--"+s.boundary)):
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return bytes.TrimSuffix(bytes.TrimSuffix(res, []byte("\n")), []byte("\r")), true, nil
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case bytes.HasSuffix(bytes.TrimSpace(line), []byte(s.boundary+"--")):
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return bytes.TrimSuffix(bytes.TrimSuffix(res, []byte("\n")), []byte("\r")), false, nil
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default:
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res = append(res, line...)
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}
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}
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}
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