Document AP and nodeinfo extensions
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And while add it point to this via a top-level
FEDERATION.md document as standardised by FEP-67ff.

Also add a few missing descriptions to the config cheatsheet
and move the recently removed C2S extension into an appropiate
subsection.
This commit is contained in:
Oneric 2024-05-16 21:05:01 +02:00
parent 5e92f955ac
commit 05eda169fe
5 changed files with 463 additions and 4 deletions

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@ -11,6 +11,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
- Issue allowing use of non-media objects as attachments and crashing timeline rendering - Issue allowing use of non-media objects as attachments and crashing timeline rendering
- Issue allowing webfinger spoofing in certain situations - Issue allowing webfinger spoofing in certain situations
## Added
- Implement [FEP-67ff](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md) (federation documentation)
## 2024.04 ## 2024.04
## Added ## Added

42
FEDERATION.md Normal file
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@ -0,0 +1,42 @@
# Federation
## Supported federation protocols and standards
- [ActivityPub](https://www.w3.org/TR/activitypub/) (Server-to-Server)
- [WebFinger](https://webfinger.net/)
- [Http Signatures](https://datatracker.ietf.org/doc/html/draft-cavage-http-signatures)
- [NodeInfo](https://nodeinfo.diaspora.software/)
## Supported FEPs
- [FEP-67ff: FEDERATION](https://codeberg.org/fediverse/fep/src/branch/main/fep/67ff/fep-67ff.md)
- [FEP-f1d5: NodeInfo in Fediverse Software](https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md)
- [FEP-fffd: Proxy Objects](https://codeberg.org/fediverse/fep/src/branch/main/fep/fffd/fep-fffd.md)
## ActivityPub
Akkoma mostly follows the server-to-server parts of the ActivityPub standard,
but implements quirks for Mastodon compatibility as well as Mastodon-specific
and custom extensions.
See our documentation and Mastodons federation information
linked further below for details on these quirks and extensions.
Akkoma does not perform JSON-LD processing.
### Required extensions
#### HTTP Signatures
All AP S2S POST requests to Akkoma instances MUST be signed.
Depending on instance configuration the same may be true for GET requests.
## Nodeinfo
Akkoma provides many additional entries in its nodeinfo response,
see the documentation linked below for details.
## Additional documentation
- [Akkomas ActivityPub extensions](https://docs.akkoma.dev/develop/development/ap_extensions/)
- [Akkomas nodeinfo extensions](https://docs.akkoma.dev/develop/development/nodeinfo_extensions/)
- [Mastodons federation requirements](https://github.com/mastodon/mastodon/blob/main/FEDERATION.md)

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@ -63,6 +63,8 @@ To add configuration to your config file, you can copy it from the base config.
* `local_bubble`: Array of domains representing instances closely related to yours. Used to populate the `bubble` timeline. e.g `["example.com"]`, (default: `[]`) * `local_bubble`: Array of domains representing instances closely related to yours. Used to populate the `bubble` timeline. e.g `["example.com"]`, (default: `[]`)
* `languages`: List of Language Codes used by the instance. This is used to try and set a default language from the frontend. It will try and find the first match between the languages set here and the user's browser languages. It will default to the first language in this setting if there is no match.. (default `["en"]`) * `languages`: List of Language Codes used by the instance. This is used to try and set a default language from the frontend. It will try and find the first match between the languages set here and the user's browser languages. It will default to the first language in this setting if there is no match.. (default `["en"]`)
* `export_prometheus_metrics`: Enable prometheus metrics, served at `/api/v1/akkoma/metrics`, requiring the `admin:metrics` oauth scope. * `export_prometheus_metrics`: Enable prometheus metrics, served at `/api/v1/akkoma/metrics`, requiring the `admin:metrics` oauth scope.
* `privileged_staff`: Set to `true` to give moderators access to a few higher responsibility actions.
* `federated_timeline_available`: Set to `false` to remove access to the federated timeline for all users.
## :database ## :database
* `improved_hashtag_timeline`: Setting to force toggle / force disable improved hashtags timeline. `:enabled` forces hashtags to be fetched from `hashtags` table for hashtags timeline. `:disabled` forces object-embedded hashtags to be used (slower). Keep it `:auto` for automatic behaviour (it is auto-set to `:enabled` [unless overridden] when HashtagsTableMigrator completes). * `improved_hashtag_timeline`: Setting to force toggle / force disable improved hashtags timeline. `:enabled` forces hashtags to be fetched from `hashtags` table for hashtags timeline. `:disabled` forces object-embedded hashtags to be used (slower). Keep it `:auto` for automatic behaviour (it is auto-set to `:enabled` [unless overridden] when HashtagsTableMigrator completes).

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@ -4,7 +4,6 @@
The following endpoints are additionally present into our actors. The following endpoints are additionally present into our actors.
- `oauthRegistrationEndpoint` (`http://litepub.social/ns#oauthRegistrationEndpoint`) - `oauthRegistrationEndpoint` (`http://litepub.social/ns#oauthRegistrationEndpoint`)
- `uploadMedia` (`https://www.w3.org/ns/activitystreams#uploadMedia`)
### oauthRegistrationEndpoint ### oauthRegistrationEndpoint
@ -12,6 +11,279 @@ Points to MastodonAPI `/api/v1/apps` for now.
See <https://docs.joinmastodon.org/methods/apps/> See <https://docs.joinmastodon.org/methods/apps/>
## Emoji reactions
Emoji reactions are implemented as a new activity type `EmojiReact`.
A single user is allowed to react multiple times with different emoji to the
same post. However, they may only react at most once with the same emoji.
Repeated reaction from the same user with the same emoji are to be ignored.
Emoji reactions are also distinct from `Like` activities and a user may both
`Like` and react to a post.
!!! note
Misskey also supports emoji reactions, but the implementations differs.
It equates likes and reactions and only allows a single reaction per post.
The emoji is placed in the `content` field of the activity
and the `object` property points to the note reacting to.
Emoji can either be any Unicode emoji sequence or a custom emoji.
The latter must place their shortcode, including enclosing colons,
into `content` and put the emoji object inside the `tag` property.
The `tag` property MAY be omitted for Unicode emoji.
An example reaction with a Unicode emoji:
```json
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://example.org/schemas/litepub-0.1.jsonld",
{
"@language": "und"
}
],
"type": "EmojiReact",
"id": "https://example.org/activities/23143872a0346141",
"actor": "https://example.org/users/akko",
"nickname": "akko",
"to": ["https://remote.example/users/diana", "https://example.org/users/akko/followers"],
"cc": ["https://www.w3.org/ns/activitystreams#Public"],
"content": "🧡",
"object": "https://remote.example/objects/9f0e93499d8314a9"
}
```
An example reaction with a custom emoji:
```json
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://example.org/schemas/litepub-0.1.jsonld",
{
"@language": "und"
}
],
"type": "EmojiReact",
"id": "https://example.org/activities/d75586dec0541650",
"actor": "https://example.org/users/akko",
"nickname": "akko",
"to": ["https://remote.example/users/diana", "https://example.org/users/akko/followers"],
"cc": ["https://www.w3.org/ns/activitystreams#Public"],
"content": ":mouse:",
"object": "https://remote.example/objects/9f0e93499d8314a9",
"tag": [{
"type": "Emoji",
"id": null,
"name": "mouse",
"icon": {
"type": "Image",
"url": "https://example.org/emoji/mouse/mouse.png"
}
}]
}
```
!!! note
Although an emoji reaction can only contain a single emoji,
for compatibility with older versions of Pleroma and Akkoma,
it is recommended to wrap the emoji object in a single-element array.
When reacting with a remote custom emoji do not include the remote domain in `content`s shortcode
*(unlike in our REST API which needs the domain)*:
```json
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://example.org/schemas/litepub-0.1.jsonld",
{
"@language": "und"
}
],
"type": "EmojiReact",
"id": "https://example.org/activities/7993dcae98d8d5ec",
"actor": "https://example.org/users/akko",
"nickname": "akko",
"to": ["https://remote.example/users/diana", "https://example.org/users/akko/followers"],
"cc": ["https://www.w3.org/ns/activitystreams#Public"],
"content": ":hug:",
"object": "https://remote.example/objects/9f0e93499d8314a9",
"tag": [{
"type": "Emoji",
"id": "https://other.example/emojis/hug",
"name": "hug",
"icon": {
"type": "Image",
"url": "https://other.example/files/b71cea432b3fad67.webp"
}
}]
}
```
Emoji reactions can be retracted using a standard `Undo` activity:
```json
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"http://example.org/schemas/litepub-0.1.jsonld",
{
"@language": "und"
}
],
"type": "Undo",
"id": "http://example.org/activities/4685792e-efb6-4309-b508-ae4f355dd695",
"actor": "https://example.org/users/akko",
"to": ["https://remote.example/users/diana", "https://example.org/users/akko/followers"],
"cc": ["https://www.w3.org/ns/activitystreams#Public"],
"object": "https://example.org/activities/23143872a0346141"
}
```
## User profile backgrounds
Akkoma federates user profile backgrounds the same way as Sharkey.
An actors ActivityPub representation contains an additional
`backgroundUrl` property containing an `Image` object. This property
belongs to the `"sharkey": "https://joinsharkey.org/ns#"` namespace.
## Quote Posts
Akkoma allows referencing a single other note as a quote,
which will be prominently displayed in the interface.
The quoted post is referenced by its ActivityPub id in the `quoteUri` property.
!!! note
Old Misskey only understood and modern Misskey still prefers
the `_misskey_quote` property for this. Similar some other older
software used `quoteUrl` or `quoteURL`.
All current implementations with quote support understand `quoteUri`.
Example:
```json
{
"@context": [
"https://www.w3.org/ns/activitystreams",
"https://example.org/schemas/litepub-0.1.jsonld",
{
"@language": "und"
}
],
"type": "Note",
"id": "https://example.org/activities/85717e587f95d5c0",
"actor": "https://example.org/users/akko",
"to": ["https://remote.example/users/diana", "https://example.org/users/akko/followers"],
"cc": ["https://www.w3.org/ns/activitystreams#Public"],
"context": "https://example.org/contexts/1",
"content": "Look at that!",
"quoteUri": "http://remote.example/status/85717e587f95d5c0",
"contentMap": {
"en": "Look at that!"
},
"source": {
"content": "Look at that!",
"mediaType": "text/plain"
},
"published": "2024-04-06T23:40:28Z",
"updated": "2024-04-06T23:40:28Z",
"attachemnt": [],
"tag": []
}
```
## Threads
Akkoma assigns all posts of the same thread the same `context`. This is a
standard ActivityPub property but its meaning is left vague. Akkoma will
always treat posts with identical `context` as part of the same thread.
`context` must not be assumed to hold any meaning or be dereferencable.
Incoming posts without `context` will be assigned a new context.
!!! note
Mastodon uses the non-standard `conversation` property for the same purpose
*(named after an older OStatus property)*. For incoming posts without
`context` but with `converstions` Akkoma will use the value from
`conversations` to fill in `context`.
For outgoing posts Akkoma will duplicate the context into `conversation`.
## Post Source
Unlike Mastodon, Akkoma supports drafting posts in multiple source formats
besides plaintext, like Markdown or MFM. The original input is preserved
in the standard ActivityPub `source` property *(not supported by Mastodon)*.
Still, `content` will always be present and contain the prerendered HTML form.
Supported `mediaType` include:
- `text/plain`
- `text/markdown`
- `text/bbcode`
- `text/x.misskeymarkdown`
## Post Language
!!! note
This is also supported in and compatible with Mastodon, but since
joinmastodon.org doesnt document it yet it is included here.
[GoToSocial](https://docs.gotosocial.org/en/latest/federation/federating_with_gotosocial/#content-contentmap-and-language)
has a more refined version of this which can correctly deal with multiple language entries.
A post can indicate its language by including a `contentMap` object
which contains a sub key named after the languages ISO 639-1 code
and its content identical to the posts `content` field.
Currently Akkoma, just like Mastodon, only properly supports a single language entry,
in case of multiple entries a random language will be picked.
Furthermore, Akkoma currently only reads the `content` field
and never the value from `contentMap`.
## Local post scope
Post using this scope will never federate to other servers
but for the sake of completeness it is listed here.
In addition to the usual scopes *(public, unlisted, followers-only, direct)*
Akkoma supports an “unlisted” post scope. Such posts will not federate to
other instances and only be shown to logged-in users on the same instance.
It is included into the local timeline.
This may be useful to discuss or announce instance-specific policies and topics.
A post is addressed to the local scope by including `<base url of instance>/#Public`
in its `to` field. E.g. if the instance is on `https://example.org` it would use
`https://example.org/#Public`.
An implementation creating a new post MUST NOT address both the local and
general public scope `as:Public` at the same time. A post addressing the local
scope MUST NOT be sent to other instances or be possible to fetch by other
instances regardless of potential other listed addressees.
When receiving a remote post addressing both the public scope and what appears
to be a local-scope identifier, the post SHOULD be treated without assigning any
special meaning to the potential local-scope identifier.
!!! note
Misskey-derivatives have a similar concept of non-federated posts,
however those are also shown publicly on the local web interface
and are thus visible to non-members.
## List post scope
Messages originally addressed to a custom list will contain
a `listMessage` field with an unresolvable pseudo ActivityPub id.
# Deprecated and Removed Extensions
The following extensions were used in the past but have been dropped.
Documentation is retained here as a reference and since old objects might
still contains related fields.
## Actor endpoints
The following endpoints used to be present:
- `uploadMedia` (`https://www.w3.org/ns/activitystreams#uploadMedia`)
### uploadMedia ### uploadMedia
Inspired by <https://www.w3.org/wiki/SocialCG/ActivityPub/MediaUpload>, it is part of the ActivityStreams namespace because it used to be part of the ActivityPub specification and got removed from it. Inspired by <https://www.w3.org/wiki/SocialCG/ActivityPub/MediaUpload>, it is part of the ActivityStreams namespace because it used to be part of the ActivityPub specification and got removed from it.
@ -20,9 +292,8 @@ Content-Type: multipart/form-data
Parameters: Parameters:
- (required) `file`: The file being uploaded - (required) `file`: The file being uploaded
- (optionnal) `description`: A plain-text description of the media, for accessibility purposes. - (optional) `description`: A plain-text description of the media, for accessibility purposes.
Response: HTTP 201 Created with the object into the body, no `Location` header provided as it doesn't have an `id` Response: HTTP 201 Created with the object into the body, no `Location` header provided as it doesn't have an `id`
The object given in the reponse should then be inserted into an Object's `attachment` field. The object given in the response should then be inserted into an Object's `attachment` field.

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# Nodeinfo Extensions
Akkoma currently implements version 2.0 and 2.1 of nodeinfo spec,
but provides the following additional fields.
## metadata
The spec leaves the content of `metadata` up to implementations
and indeed Akkoma adds many fields here apart from the commonly
found `nodeName` and `nodeDescription` fields.
### accountActivationRequired
Whether or not users need to confirm their email before completing registration.
*(boolean)*
!!! note
Not to be confused with account approval, where each registration needs to
be manually approved by an admin. Account approval has no nodeinfo entry.
### features
Array of strings denoting supported server features. E.g. a server supporting
quote posts should include a `"quote_posting"` entry here.
A non-exhaustive list of possible features:
- `polls`
- `quote_posting`
- `editing`
- `bubble_timeline`
- `pleroma_emoji_reactions` *(Unicode emoji)*
- `custom_emoji_reactions`
- `akkoma_api`
- `akkoma:machine_translation`
- `mastodon_api`
- `pleroma_api`
### federatedTimelineAvailable
Whether or not the “federated timeline”, i.e. a timeline containing posts from
the entire known network, is made available.
*(boolean)*
### federation
This section is optional and can contain various custom keys describing federation policies.
The following are required to be presented:
- `enabled` *(boolean)* whether the server federates at all
A non-exhaustive list of optional keys:
- `exclusions` *(boolean)* whether some federation policies are withheld
- `mrf_simple` *(object)* describes how the Simple MRF policy is configured
### fieldsLimits
A JSON object documenting restriction for user account info fields.
All properties are integers.
- `maxFields` maximum number of account info fields local users can create
- `maxRemoteFields` maximum number of account info fields remote users can have
before the user gets rejected or fields truncated
- `nameLength` maximum length of a fields name
- `valueLength` maximum length of a fields value
### invitesEnabled
Whether or not signing up via invite codes is possible.
*(boolean)*
### localBubbleInstances
Array of domains (as strings) of other instances chosen
by the admin which are shown in the bubble timeline.
### mailerEnabled
Whether or not the instance can send out emails.
*(boolean)*
### nodeDescription
Human-friendly description of this instance
*(string)*
### nodeName
Human-friendly name of this instance
*(string)*
### pollLimits
JSON object containing limits for polls created by local users.
All values are integers.
- `max_options` maximum number of poll options
- `max_option_chars` maximum characters per poll option
- `min_expiration` minimum time in seconds a poll must be open for
- `max_expiration` maximum time a poll is allowed to be open for
### postFormats
Array of strings containing media types for supported post source formats.
A non-exhaustive list of possible values:
- `text/plain`
- `text/markdown`
- `text/bbcode`
- `text/x.misskeymarkdown`
### private
Whether or not unauthenticated API access is permitted.
*(boolean)*
### privilegedStaff
Whether or not moderators are trusted to perform some
additional tasks like e.g. issuing password reset emails.
### publicTimelineVisibility
JSON object containing boolean-valued keys reporting
if a given timeline can be viewed without login.
- `local`
- `federated`
- `bubble`
### restrictedNicknames
Array of strings listing nicknames forbidden to be used during signup.
### skipThreadContainment
Whether broken threads are filtered out
*(boolean)*
### staffAccounts
Array containing ActivityPub IDs of local accounts
with some form of elevated privilege on the instance.
### suggestions
JSON object containing info on whether the interaction-based
Mastodon `/api/v1/suggestions` feature is enabled and optionally
additional implementation-defined fields with more details
on e.g. how suggested users are selected.
!!! note
This has no relation to the newer /api/v2/suggestions API
which also (or exclusively) contains staff-curated entries.
- `enabled` *(boolean)* whether or not user recommendations are enabled
### uploadLimits
JSON object documenting various upload-related size limits.
All values are integers and in bytes.
- `avatar` maximum size of uploaded user avatars
- `banner` maximum size of uploaded user profile banners
- `background` maximum size of uploaded user profile backgrounds
- `general` maximum size for all other kinds of uploads