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Replace imeta with resource tag

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arthurfranca 2023-08-31 10:55:42 -03:00
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@ -8,13 +8,13 @@ Inline Resource Metadata
Inline resource metadata is additional information associated with urls in notes that clients can optionally use to enhance resource loading.
It uses [URI Fragment](https://en.wikipedia.org/wiki/URI_fragment) that agents (such as web browsers) never send to the server.
It uses [URI Fragment](https://en.wikipedia.org/wiki/URI_fragment) that agents (such as web browsers) never send to the server. Because of this, the url is fetched **without** the fragment parameters, unlike using query parameters.
The URI fragment follows [media fragments structure](https://www.w3.org/TR/media-frags/#general-structure). For example, one could use `t=number_of_seconds` to start playing a video at the specified position along with an extra [percent-encoded](https://www.ietf.org/rfc/rfc3986.txt) name-value pair separated by `&` char like `https://xyz.com/a-video.mp4#t=24&a%20name=a%20value`.
The URI fragment follows [media fragments structure](https://www.w3.org/TR/media-frags/#general-structure). For example, one could use `t=number_of_seconds` to start playing a video at the specified position along with an extra [percent-encoded](https://www.ietf.org/rfc/rfc3986.txt) name-value pair separated by `&` char like `https://xyz.com/a-video.mp4#t=24&a%20name=a%20value`. **Notice the usage of `#` instead of `?`.**
The metadata can be appended to any url, like this [NIP-21](21.md) one: `nostr:nevent1qq...pm#a-metadata-name=a-metadata-value`.
It is suggested to also add `imeta` tags to events to aid in loading resource placeholders.
One may also add `resource` tags to events to aid in loading resource placeholders on clients that postpone or don't do event `.content` parsing.
## NIP-94 File Fragments
@ -22,40 +22,48 @@ Besides available w3c and proprietary URI fragment usage, nostr uses existing [N
- `https://nostr.build/i/863321bb1ae68830ebcf9a343ca0a5e0ce2323d0a55b7fbe86f7a886cf61db8d.jpg`
- `#`
- `m=image%2Fjpeg`
- `&`
- `dim=3024x4032`
- `&`
- `alt=A%20scenic%20photo%20overlooking%20the%20coast%20of%20Costa%20Rica`
- `&`
- `blurhash=eVF%24%5EOI%3A%24%7BM%7Bo%23*0-nNFxakD-%3FxVM%7DWEWB%25iNKxvR-oetmo%23R-aen%24`
Multiple array values use repeated names and are positioned in the same order of ocurrence in the tag array. For instance, `["aes-256-gcm", 'i-am-a-key', 'i-am-an-iv']` becomes `aes-256-gcm=i-am-a-key&aes-256-gcm=i-am-an-iv`
Multiple array values use repeated names and are positioned in the same order of ocurrence in the tag array. For instance, `["aes-256-gcm", 'i-am-a-key', 'i-am-an-iv']` becomes `aes-256-gcm=i-am-a-key&aes-256-gcm=i-am-an-iv`.
## imeta tag
## Tag Usage
Metadata fragments are great for sharing urls with extra embedded metadata. They are also good for copying and pasting a resource's url from one note to a new one without losing its metadata.
But some clients can prepare image and video placeholders faster if specific fields are present outside of `.content`.
For these resources, it is suggested to also add `dim`, `alt` and `blurhash` (e.g. of a specific video frame), if available, to `imeta` tags.
For these resources, it is suggested to also add `dim`, `alt` and `blurhash`, if available, to media urls inside `resource` tags.
### Complete example:
### Event Example:
```js
{
"kind": 1,
"content": "What a great place! https://xyz.com/example.jpg#dim=3024x4032&alt=A%20scenic%20photo%20overlooking%20the%20coast%20of%20Costa%20Rica&blurhash=eVF%24%5EOI%3A%24%7BM%7Bo%23*0-nNFxakD-%3FxVM%7DWEWB%25iNKxvR-oetmo%23R-aen%24`",
"content": "What a great place! https://xyz.com/example.jpg#m=image%2Fjpeg&dim=3024x4032&alt=A%20scenic%20photo%20overlooking%20the%20coast%20of%20Costa%20Rica&blurhash=eVF%24%5EOI%3A%24%7BM%7Bo%23*0-nNFxakD-%3FxVM%7DWEWB%25iNKxvR-oetmo%23R-aen%24`",
"tags": [
[
"imeta",
"url https://xyz.com/example.jpg",
"dim 3024x4032",
"alt A scenic photo overlooking the coast of Costa Rica",
"blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$"
"resource", "https://xyz.com/example.jpg#dim=3024x4032&alt=A%20scenic%20photo%20overlooking%20the%20coast%20of%20Costa%20Rica&blurhash=eVF%24%5EOI%3A%24%7BM%7Bo%23*0-nNFxakD-%3FxVM%7DWEWB%25iNKxvR-oetmo%23R-aen%24"
]
]
// ... other event fields
}
```
Also, some event kinds other than kind 1 and kind 30023 may have been designed with urls inside tags instead of in `.content`. For these cases, use `resource` tags (or `r` tags if it needs to be indexed by relays – in this case, metadata fragment keys and query parameter keys SHOULD be arranged in ascending order).
### Tag Examples:
A kind 30023 event JSON file (with `nostr/30023` MIME type):
`["resource", "https://xyz.com/example.json#m=nostr%2F30023"]`
A PDF file without extension with added MIME type information:
`["r", "https://xyz.com/article02#m=application%2Fpdf"]`
## Recommended client behavior
When uploading images during a new post, clients can collect metadata

1
README.md
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@ -195,6 +195,7 @@ Please update these lists when proposing NIPs introducing new event kinds.
| `published_at` | unix timestamp (string) | -- | [23](23.md) |
| `relay` | relay url | -- | [42](42.md) |
| `relays` | relay list | -- | [57](57.md) |
| `resource | URL | -- | [54](54.md) |
| `subject` | subject | -- | [14](14.md) |
| `summary` | article summary | -- | [23](23.md) |
| `thumb` | badge thumbnail | dimensions in pixels | [58](58.md) |