119 lines
2.9 KiB
Go
119 lines
2.9 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 transfer
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import (
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"bufio"
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"bytes"
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"io"
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"mime"
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"os"
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"strings"
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)
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type stringSet map[string]bool
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const xGmailLabelsHeader = "X-Gmail-Labels"
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// filteredOutGmailLabels is set of labels which we don't want to show to users
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// as they might be auto-generated by Gmail and unwanted.
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var filteredOutGmailLabels = []string{ //nolint[gochecknoglobals]
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"Unread",
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"Opened",
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"IMAP_Junk",
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"IMAP_NonJunk",
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"IMAP_NotJunk",
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"IMAP_$NotJunk",
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}
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func getGmailLabelsFromMboxFile(filePath string) (stringSet, error) {
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f, err := os.Open(filePath) //nolint[gosec]
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if err != nil {
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return nil, err
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}
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return getGmailLabelsFromMboxReader(f)
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}
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func getGmailLabelsFromMboxReader(f io.Reader) (stringSet, error) {
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allLabels := stringSet{}
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// Scanner is not used as it does not support long lines and some mbox
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// files contain very long lines even though that should not be happening.
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r := bufio.NewReader(f)
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for {
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b, isPrefix, err := r.ReadLine()
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, err
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}
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for isPrefix {
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_, isPrefix, err = r.ReadLine()
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if err != nil {
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break
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}
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}
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if bytes.HasPrefix(b, []byte(xGmailLabelsHeader)) {
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for label := range getGmailLabelsFromValue(string(b)) {
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allLabels[label] = true
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}
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}
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}
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return allLabels, nil
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}
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func getGmailLabelsFromMessage(body []byte) (stringSet, error) {
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header, err := getMessageHeader(body)
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if err != nil {
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return nil, err
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}
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labels := header.Get(xGmailLabelsHeader)
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return getGmailLabelsFromValue(labels), nil
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}
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func getGmailLabelsFromValue(value string) stringSet {
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value = strings.TrimPrefix(value, xGmailLabelsHeader+":")
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if decoded, err := new(mime.WordDecoder).DecodeHeader(value); err != nil {
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log.WithError(err).Error("Failed to decode header")
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} else {
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value = decoded
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}
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labels := stringSet{}
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for _, label := range strings.Split(value, ",") {
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label = strings.TrimSpace(label)
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if label == "" {
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continue
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}
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skip := false
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for _, filteredOutLabel := range filteredOutGmailLabels {
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if label == filteredOutLabel {
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skip = true
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break
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}
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}
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if skip {
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continue
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}
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labels[label] = true
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}
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return labels
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}
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