2024-08-23 01:39:54 +02:00
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# matrix-media-event-decrypt
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Decrypt [matrix] media manually using event JSON obtained from a client.
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Sometimes decrypting media fails for unknown reasons or your homeserver isn't able
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to federate in media from another server. If you were still able to receive the media
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event and (if encrypted) see the decrypted JSON, this tool might be able to help you
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download and decrypt the content.
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2024-08-23 01:52:10 +02:00
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[](https://asciinema.org/a/673199)
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2024-08-23 01:39:54 +02:00
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## Building
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A simple `cargo run --release --` should be all it takes. If not and on systems with an
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implementation of the Nix Package Manager (such as [lix](https://lix.systems)) you can
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install any required dependencies (probably only openssl) by running `nix-shell` first.
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## Usage
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Running the binary without any arguments will prompt you to paste the JSON of the media
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event you want to retrieve the contents of. On Element Web / Desktop this is the message
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context menu > View Source > Decrypted / Original Event Source.
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On other clients you might need to fiddle around with the JSON a little, important is
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that it looks something like this:
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2024-08-23 01:40:13 +02:00
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```json
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2024-08-23 01:39:54 +02:00
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{
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"content": {
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"body": "something.jpg",
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"msgtype": "m.image",
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"m.mentions": {},
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"url": "mxc://nwex.de/undefined",
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// A bunch more
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},
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// A bunch more
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}
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```
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Confirm by hitting <kbd>Ctrl</kbd>+<kbd>D</kbd> or <kbd>Enter</kbd> and wait for the magic to
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happen. You might be prompted to enter an access token if the server requires authentication
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to fetch the media. For convenience, this tool ignores the [matrix] specification and doesn't
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always use authenticated endpoints if support is advertised, instead just trying if it can get
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away without a token.
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You can customize the server to download media from by passing `--server matrix.org`, for example.
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## Contributing
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For convenience this project is hosted on my personal git server without public registrations
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enabled. If you want to contribute feel free to reach out via the various platforms listed on
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[my website](https://nwex.de/).
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