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move imeta to NIP-92, add imeta tag to README.

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fiatjaf
2024-02-01 20:59:37 -03:00
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NIP-29
======
Media Attachments
-----------------
Media attachments (images, videos, and other files) may be added to events by including a URL in the event content, along with a matching `imeta` tag.
`imeta` ("inline metadata") tags add information about media URLs in the event's content. Each `imeta` tag SHOULD match a URL in the event content. Clients may replace imeta URLs with rich previews.
The `imeta` tag is variadic, and each entry is a space-delimited key/value pair.
Each `imeta` tag MUST have a `url`, and at least one other field. `imeta` may include
any field specified by [NIP 94](./94.md). There SHOULD be only one `imeta` tag per url.
## Example
```json
{
"content": "More image metadata tests don’t mind me https://nostr.build/i/my-image.jpg",
"kind": 1,
"tags": [
[
"imeta",
"url https://nostr.build/i/my-image.jpg",
"m image/jpeg",
"blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
"dim 3024x4032",
"alt A scenic photo overlooking the coast of Costa Rica",
"x <sha256 hash as specified in NIP 94>",
"fallback https://nostrcheck.me/alt1.jpg"
"fallback https://void.cat/alt1.jpg"
]
]
}
```
## Recommended client behavior
When uploading files during a new post, clients MAY include this metadata
after the file is uploaded and included in the post.
When pasting urls during post composition, the client MAY download the file
and add this metadata before the post is sent.