172 lines
4.9 KiB
Go
172 lines
4.9 KiB
Go
// Copyright (c) 2023 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 user
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import (
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"bytes"
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"html/template"
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"time"
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"github.com/ProtonMail/gluon/imap"
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"github.com/ProtonMail/go-proton-api"
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"github.com/ProtonMail/gopenpgp/v2/crypto"
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"github.com/ProtonMail/proton-bridge/v3/pkg/algo"
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"github.com/ProtonMail/proton-bridge/v3/pkg/message"
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"github.com/bradenaw/juniper/xslices"
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)
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type buildRes struct {
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messageID string
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addressID string
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update *imap.MessageCreated
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err error
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}
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func defaultJobOpts() message.JobOptions {
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return message.JobOptions{
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IgnoreDecryptionErrors: true, // Whether to ignore decryption errors and create a "custom message" instead.
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SanitizeDate: true, // Whether to replace all dates before 1970 with RFC822's birthdate.
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AddInternalID: true, // Whether to include MessageID as X-Pm-Internal-Id.
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AddExternalID: true, // Whether to include ExternalID as X-Pm-External-Id.
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AddMessageDate: true, // Whether to include message time as X-Pm-Date.
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AddMessageIDReference: true, // Whether to include the MessageID in References.
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}
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}
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func buildRFC822(apiLabels map[string]proton.Label, full proton.FullMessage, addrKR *crypto.KeyRing) *buildRes {
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var (
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update *imap.MessageCreated
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err error
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)
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if literal, buildErr := message.BuildRFC822(addrKR, full.Message, full.AttData, defaultJobOpts()); buildErr != nil {
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update = newMessageCreatedFailedUpdate(apiLabels, full.MessageMetadata, buildErr)
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err = buildErr
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} else if created, parseErr := newMessageCreatedUpdate(apiLabels, full.MessageMetadata, literal); parseErr != nil {
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update = newMessageCreatedFailedUpdate(apiLabels, full.MessageMetadata, parseErr)
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err = parseErr
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} else {
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update = created
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}
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return &buildRes{
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messageID: full.ID,
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addressID: full.AddressID,
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update: update,
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err: err,
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}
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}
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func newMessageCreatedUpdate(
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apiLabels map[string]proton.Label,
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message proton.MessageMetadata,
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literal []byte,
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) (*imap.MessageCreated, error) {
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parsedMessage, err := imap.NewParsedMessage(literal)
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if err != nil {
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return nil, err
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}
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return &imap.MessageCreated{
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Message: toIMAPMessage(message),
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Literal: literal,
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MailboxIDs: mapTo[string, imap.MailboxID](wantLabels(apiLabels, message.LabelIDs)),
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ParsedMessage: parsedMessage,
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}, nil
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}
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func newMessageCreatedFailedUpdate(
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apiLabels map[string]proton.Label,
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message proton.MessageMetadata,
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err error,
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) *imap.MessageCreated {
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literal := newFailedMessageLiteral(message.ID, time.Unix(message.Time, 0), message.Subject, err)
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parsedMessage, err := imap.NewParsedMessage(literal)
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if err != nil {
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panic(err)
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}
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return &imap.MessageCreated{
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Message: toIMAPMessage(message),
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MailboxIDs: mapTo[string, imap.MailboxID](wantLabels(apiLabels, message.LabelIDs)),
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Literal: literal,
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ParsedMessage: parsedMessage,
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}
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}
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func newFailedMessageLiteral(
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messageID string,
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date time.Time,
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subject string,
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syncErr error,
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) []byte {
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var buf bytes.Buffer
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if tmpl, err := template.New("header").Parse(failedMessageHeaderTemplate); err != nil {
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panic(err)
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} else if b, err := tmplExec(tmpl, map[string]any{
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"Date": date.In(time.UTC).Format(time.RFC822),
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}); err != nil {
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panic(err)
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} else if _, err := buf.Write(b); err != nil {
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panic(err)
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}
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if tmpl, err := template.New("body").Parse(failedMessageBodyTemplate); err != nil {
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panic(err)
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} else if b, err := tmplExec(tmpl, map[string]any{
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"MessageID": messageID,
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"Subject": subject,
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"Error": syncErr.Error(),
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}); err != nil {
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panic(err)
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} else if _, err := buf.Write(lineWrap(algo.B64Encode(b))); err != nil {
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panic(err)
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}
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return buf.Bytes()
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}
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func tmplExec(template *template.Template, data any) ([]byte, error) {
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var buf bytes.Buffer
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if err := template.Execute(&buf, data); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func lineWrap(b []byte) []byte {
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return bytes.Join(xslices.Chunk(b, 76), []byte{'\r', '\n'})
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}
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const failedMessageHeaderTemplate = `Date: {{.Date}}
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Subject: Message failed to build
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Content-Type: text/plain
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Content-Transfer-Encoding: base64
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`
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const failedMessageBodyTemplate = `Failed to build message:
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Subject: {{.Subject}}
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Error: {{.Error}}
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MessageID: {{.MessageID}}
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`
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