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Update "File Thumbnails"

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- Rename from "Thumbnails" to prevent a XML tag clash with Jingle
  Content Thumbnails
- Prepend a "proto:" to the chosen xmlns to prevent issues with live
  XEPs
- Add information about this not-really-proto XEP
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PapaTutuWawa 2022-02-27 18:56:08 +01:00
parent bbaa932ec8
commit 6d9e295741
1 changed files with 29 additions and 21 deletions
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xep-xxxx-thumbnails.md → xep-xxxx-file-thumbnails.md
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@ -1,4 +1,4 @@
# Thumbnails
# File Thumbnails
## Introduction
When sending media, it is often helpful for users when a thumbnail can be shown before the
@ -14,42 +14,43 @@ This document specifies are more general and extensible element for specifiying
## Usage
```xml
<thumbnail type="blurhash" xmlns="urn:xmpp:thumbnail:0">
<payload>LEHV6nWB2yk8pyoJadR*.7kCMdnj</payload>
<file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:blurhash" xmlns="proto:urn:xmpp:file-thumbnails:0">
<blurhash>LEHV6nWB2yk8pyoJadR*.7kCMdnj</blurhash>
</thumbnail>
```
In this example, the thumbnail is specified of type `blurhash`, which means that a supporting
client should decode the `<payload/>` element using the [Blurhash](https://github.com/woltapp/blurhash) algorithm.
In this example, the thumbnail is specified of type `proto:urn:xmpp:file-thumbnails:0:blurhash`, which means that a supporting
client should decode the `<blurhash/>` element using the [Blurhash](https://github.com/woltapp/blurhash) algorithm.
In order to enable a sort-of interoperability with [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html), a type
`urn:xmpp:thumbs:0` is defined. If this is specified, then a supporting client must
interpret the child of the `<payload />` as an `<thumbnail />` element as specified by
:[Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html)
`proto:urn:xmpp:file-thumbnails:0:jct` is defined.
```
<thumbnail type="urn:xmpp:thumbs:1" xmlns="urn:xmpp:thumbnail:0">
<payload>
<thumbnail xmlns="urn:xmpp:thumbs:1" uri="..." media-type="image/png" width="128" height="96" />
</payload>
```xml
<file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:jct" xmlns="proto:urn:xmpp:file-thumbnails:0">
<thumbnail xmlns="urn:xmpp:thumbs:1" uri="..." media-type="image/png" width="128" height="96" />
</thumbnail>
```
In the case of [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html) compatibility,
the `<payload />` element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
the `<file-thumbnail />` element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
Other extensions may define similar types. Note that the content of the `<payload />` element
is dependent on the type specified in the `<thumbnail xmlns="urn:xmpp:thumbnail:0" />`
Other extensions may define similar types. Note that the content of the `<file-thumbnail />` element
is dependent on the type specified in the `<file-thumbnail xmlns="proto:urn:xmpp:file-thumbnails:0" />`
element.
### Thumbnail Types
#### Blurhash
If a sender specifies the type to be of `blurhash`, then the payload must contain the
If a sender specifies the type to be of `proto:urn:xmpp:file-thumbnails:0:blurhash`, then the `<file-thumbnail />` element must contain the
image data as specified by the [Blurhash](https://github.com/woltapp/blurhash) algorithm. Care should be taken to prevent
the blurhash data from growing to large in order to prevent hitting the stanza size limit.
## Usage with Stateless Inline Media Sharing
### Jingle Content Thumbnail Compatability
If a sender specified the type to be of `proto:urn:xmpp:file-thumbnails:0:jct`, then the `<file-thumbnail />`
element must contain exactly one `<thumbnail xmlns="urn:xmpp:thumbs:1" />` element.
## Usage Example with Stateless Inline Media Sharing
NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.org/extensions/xep-0385.html) and modified for this protocol.
@ -65,13 +66,13 @@ NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.o
<hash xmlns='urn:xmpp:hashes:2' algo='sha3-256'>2XarmwTlNxDAMkvymloX3S5+VbylNrJt/l5QyPa+YoU=</hash>
<hash xmlns='urn:xmpp:hashes:2' algo='id-blake2b256'>2AfMGH8O7UNPTvUVAM9aK13mpCY=</hash>
<desc>Photo from the summit.</desc>
<thumbnail type="urn:xmpp:thumbs:1" xmlns='urn:xmpp:thumbnail:0'>
<file-thumbnail type="proto:proto:urn:xmpp:file-thumbnails:0:jct" xmlns='urn:xmpp:thumbnail:0'>
<payload>
<thumbnail xmlns='urn:xmpp:thumbs:1'uri='cid:sha1+ffd7c8d28e9c5e82afea41f97108c6b4@bob.xmpp.org' media-type='image/png' width='128' height='96'/>
</payload>
</thumbnail>
<thumbnail type="blurhash" xmlns='urn:xmpp:thumbnail:0'>
<payload>LEHV6nWB2yk8pyoJadR*.7kCMdnj</payload>
<file-thumbnail type="proto:urn:xmpp:file-thumbnails:0:blurhash" xmlns='proto:urn:xmpp:file-thumbnails:0'>
<blurhash>LEHV6nWB2yk8pyoJadR*.7kCMdnj</blurhash>
</thumbnail>
</file>
<sources>
@ -86,3 +87,10 @@ NOTE: This example is taken from [Stateless Inline Media Sharing](https://xmpp.o
## Security Considerations
The same considerations apply as specified by [Jingle Content Thumbnails](https://xmpp.org/extensions/xep-0264.html).
## Info
| Key | Value |
| --- | --- |
| Author | PapaTutuWawa |
| Version | 0.0.2 |