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MSC4197: Copy Paste Hints #4197

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MSC4197: Copy Paste Hints #4197

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MSC4197: Copy Paste Hints!!!
anoadragon453 Sep 22, 2024
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Fix the example
anoadragon453 Sep 22, 2024
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anoadragon453 Sep 22, 2024
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# MSC4197: Copy-Paste Hints
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Could possibly be more general, ie. it's just picking out the pertinent information from a message rather than necessarily anything to do with copy/paste.


In Matrix today, it can be used for communication. One thing that is communicated is two-factor auth codes. In other platforms, one convenience is being able to quickly copy-paste two factor auth codes. This is not possible in Matrix today.
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Please wrap your lines to about 80-120 characters


When sending a message, my message could contain a hint to the user's client that they should copy some particular part of the message. I propose to add a new field to `m.room.message` events that will hint to clients what text they could facilitating the user to copy.

### Proposal

* technical details
* describe the solution (This is the solution. Be assertive.)
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I think these two lines need to be dropped?


`m.room.message` contains a new field, `copy_hint`, under the existing `content` dictionary. This new field will contain a string representing text that the client could present to the user to copy.
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Suggested change
`m.room.message` contains a new field, `copy_hint`, under the existing `content` dictionary. This new field will contain a string representing text that the client could present to the user to copy.
`m.room.message` contains a new field, `m.copy_hint`, under the existing `content` dictionary. This new field will contain a string representing text that the client could present to the user to copy.

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this should probably not be limited to m.room.message. it's effectively an extensible event mix-in to provide an alternative presentation of the message specifically for proposing copy-pasting.


An example is below:


```json5
{
"content": {
"body": "DO NOT SHARE THIS WITH ANYONE!!! Your 2FA code is: 100000",
"m.mentions": {},
"msgtype": "m.text",
"copy_hint": "100000"
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please namespace the field, just as m.mentions is... - so m.copy_hint once merged

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Suggested change
"copy_hint": "100000"
"m.copy_hint": "100000"

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How would I be able to add multiple copy hints? Do I post extra empty messages per hint? Can I set the text to display on the copy button? Thinking for example, a moderation bot might want to provide a way to copy a list of MXIDs, it would be nice to able to say "Copy table", "Copy User IDs", ...

Additionally, i wonder if this might be better implemented using a custom HTML tag/property, eg. <p>Your 2FA code is <span data-mx-copy="100000">100000</span></p>, with ommission of a value copying the innerText.

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I agree HTML would be a more elegant solution. Additionally it would make it much easier for humans to send messages with copyable parts.

},
"origin_server_ts": 1726936182830,
"sender": "@andrewm:element.io",
"type": "m.room.message",
"unsigned": {
"membership": "join",
"age": 54359693,
"transaction_id": "m1726936182657.27"
},
"event_id": "$4WvO6_skvEIibdffnDKdTkFHtOKUZaPFLm8HJuXcz7E",
"room_id": "!jWkHTegEyVsdPJkjHA:element.io"
}
```

### Potential Issues

None considered!

### Alternatives
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might want to mention we're deliberately only letting you hint that a single thing is copyable, given you can only put one thing on a pasteboard.


1. `hints` dictionary.
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Rather than coming up with a new taxonomy for hints, it's better to use extensible events... i.e. you'd do an m.other_hint_type if you don't want an m.copy_hint. Although it might be nice for them to have the same shape?

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Can you explain what "hints dictionary" is?

2. Leave things as is (please don't!)
3. boolean `copy_hint` field (hint to client to copy the whole message)
4. give up (similar to 2.)
5. Use indexes in the message
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What do you mean by "indexes"?

* Harder to implement
* Use bandwidth
6. If the event is encrypted, leave the 2FA code out of the encryption
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A nice refinement could be delete-after copying semantics, but that should be an extra MSC - probably extending the existing MSC2228 self-destructing messages MSC


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Another possibility would be to add a tag to a <span> element, say something like `Your 2FA code is 123456" which would allow the client to place a "Copy" button next to the text that is to be copied.

### Security Considerations

TODO.
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Security concern: What if the text in content.body does not match the text in content.copy_hint, and the user then unknowingly has malicious content in their clipboard that does not match their expectation?

While alternative 5 adds more complexity to client developers, it reduces the attack surface to only be able to fill the clipboard with things that also are in the content.body text. However, the sender could still try to use rich text formatting to send invisible text that is then copied to the clipboard.

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There's a risk this could ease phishing attacks where people are encouraged to copy-paste official looking data into their javascript consoles...

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To justify this concern, here's some well-known implementations of this attack:

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massive spam risk here; need to explicitly advise client implementors to not allow 2FA spam to create an explosion of dialogs or similar


### Unstable prefix

What is this.

### Dependencies

I do not build on any giant's shoulders.