/
attachment.go
109 lines (93 loc) · 2.76 KB
/
attachment.go
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// mautrix-slack - A Matrix-Slack puppeting bridge.
// Copyright (C) 2022 Beeper, Max Sandholm
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"bytes"
"image"
"strings"
"maunium.net/go/mautrix/crypto/attachment"
"maunium.net/go/mautrix"
"maunium.net/go/mautrix/appservice"
"maunium.net/go/mautrix/event"
"maunium.net/go/mautrix/id"
)
func (portal *Portal) downloadMatrixAttachment(content *event.MessageEventContent) ([]byte, error) {
var file *event.EncryptedFileInfo
rawMXC := content.URL
if content.File != nil {
file = content.File
rawMXC = file.URL
}
mxc, err := rawMXC.Parse()
if err != nil {
return nil, err
}
data, err := portal.MainIntent().DownloadBytes(mxc)
if err != nil {
return nil, err
}
if file != nil {
err = file.DecryptInPlace(data)
if err != nil {
return nil, err
}
}
return data, nil
}
func (portal *Portal) uploadMedia(intent *appservice.IntentAPI, data []byte, content *event.MessageEventContent) error {
uploadMimeType, file := portal.encryptFileInPlace(data, content.Info.MimeType)
req := mautrix.ReqUploadMedia{
ContentBytes: data,
ContentType: uploadMimeType,
}
var mxc id.ContentURI
if portal.bridge.Config.Homeserver.AsyncMedia {
uploaded, err := intent.UploadAsync(req)
if err != nil {
return err
}
mxc = uploaded.ContentURI
} else {
uploaded, err := intent.UploadMedia(req)
if err != nil {
return err
}
mxc = uploaded.ContentURI
}
if file != nil {
file.URL = mxc.CUString()
content.File = file
} else {
content.URL = mxc.CUString()
}
content.Info.Size = len(data)
if content.Info.Width == 0 && content.Info.Height == 0 && strings.HasPrefix(content.Info.MimeType, "image/") {
cfg, _, _ := image.DecodeConfig(bytes.NewReader(data))
content.Info.Width, content.Info.Height = cfg.Width, cfg.Height
}
return nil
}
func (portal *Portal) encryptFileInPlace(data []byte, mimeType string) (string, *event.EncryptedFileInfo) {
if !portal.Encrypted {
return mimeType, nil
}
file := &event.EncryptedFileInfo{
EncryptedFile: *attachment.NewEncryptedFile(),
URL: "",
}
file.EncryptInPlace(data)
return "application/octet-stream", file
}