mirror of
https://github.com/ProtonMail/proton-bridge.git
synced 2025-12-10 20:56:51 +00:00
72 lines
1.8 KiB
Go
72 lines
1.8 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 imap
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import (
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"bytes"
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"strings"
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"github.com/ProtonMail/proton-bridge/pkg/message"
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"github.com/emersion/go-imap"
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)
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func filterHeader(header []byte, section *imap.BodySectionName) []byte {
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// Empty section.Fields means BODY[HEADER] was requested so we should return the full header.
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if len(section.Fields) == 0 {
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return header
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}
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fieldMap := make(map[string]struct{})
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for _, field := range section.Fields {
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fieldMap[strings.ToLower(field)] = struct{}{}
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}
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return filterHeaderLines(header, func(field string) bool {
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_, ok := fieldMap[strings.ToLower(field)]
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if section.NotFields {
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ok = !ok
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}
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return ok
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})
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}
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func filterHeaderLines(header []byte, wantField func(string) bool) []byte {
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var res []byte
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for _, line := range message.HeaderLines(header) {
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if len(bytes.TrimSpace(line)) == 0 {
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res = append(res, line...)
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} else {
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split := bytes.SplitN(line, []byte(": "), 2)
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if len(split) != 2 {
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continue
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}
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if wantField(string(bytes.ToLower(split[0]))) {
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res = append(res, line...)
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}
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}
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}
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return res
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}
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