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56 lines
1.8 KiB
56 lines
1.8 KiB
// Copyright (c) 2022 Proton AG |
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// |
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// This file is part of Proton Mail Bridge. |
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// |
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// Proton Mail 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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// Proton Mail 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 Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>. |
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package parser |
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import ( |
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"bytes" |
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"io" |
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) |
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const endOfMail = "\r\n.\r\n" |
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// endOfMailTrimmer wraps a reader to trim the End-Of-Mail indicator at the end |
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// of the input, if present. |
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// |
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// During SMTP sending of a message, the DATA command indicates that you are |
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// about to send the text (or body) of the message. The message text must end |
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// with "\r\n.\r\n." I'm 99% sure that these 5 bytes should not be considered |
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// part of the message body. However, some mail servers keep them as part of |
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// the message, which our parser sometimes doesn't like. Therefore, we strip |
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// them if we find them. |
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type endOfMailTrimmer struct { |
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r io.Reader |
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buf bytes.Buffer |
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} |
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func newEndOfMailTrimmer(r io.Reader) *endOfMailTrimmer { |
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return &endOfMailTrimmer{r: r} |
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} |
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func (r *endOfMailTrimmer) Read(p []byte) (int, error) { |
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_, err := io.CopyN(&r.buf, r.r, int64(len(p)+len(endOfMail)-r.buf.Len())) |
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if err != nil && err != io.EOF { |
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return 0, err |
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} |
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if err == io.EOF && bytes.HasSuffix(r.buf.Bytes(), []byte(endOfMail)) { |
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r.buf.Truncate(r.buf.Len() - len(endOfMail)) |
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} |
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return r.buf.Read(p) |
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}
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