I think the #ActivityPub client-to-server API is extremely important and underrated.
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@smallcircles @evan An AS2 Collection cannot be a timeline (in general). It’s not even ordered. An AS2 OrderedCollection (a subtype of Collection) might be ordered by time or not, so it’s also not a timeline (in general). When they are ordered by some time value (unspecified in AP) they are often called “streams” in the spec. The Mastodon content timelines are not the same as AP activity streams although a filtered AP stream can be transformed to a content timeline.
@steve @smallcircles The `inbox` and `outbox` are both sequences ordered by time. I think that should meet your requirements for a 'timeline'?
I think it's fair to call the outbox the actor's 'feed'? It is a feed of all their activities.
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@steve @smallcircles The `inbox` and `outbox` are both sequences ordered by time. I think that should meet your requirements for a 'timeline'?
I think it's fair to call the outbox the actor's 'feed'? It is a feed of all their activities.
@steve @smallcircles I also agree that activities are more primary than content objects like notes and images in ActivityPub. That is by design and reflected in the name of the data format, API and federation protocol.
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@steve @smallcircles I also agree that activities are more primary than content objects like notes and images in ActivityPub. That is by design and reflected in the name of the data format, API and federation protocol.
> I think it's fair to call the outbox the actor's 'feed'?
The actor's event bus in a pure event based approach.
Does that break AP? Current fediverse?
Can AP be considered an event-driven architecture of sorts (or restrained as such in a solution design)?I really like the Motivating use cases section of the AS specs, and the primer that sits on the W3C wiki to that. Those might be further formalized so they are applied consistently.
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@steve @smallcircles I also agree that activities are more primary than content objects like notes and images in ActivityPub. That is by design and reflected in the name of the data format, API and federation protocol.
That said, I think it would be great to have reverse chronological ordered collections of objects created by the actor.
It would be nice to use `streams` like `endpoints`, as an object, and define properties like `notes`, `images`, `places` and so on off of it.
Unfortunately the loose definition and lack of examples for `streams` makes it hard to use. It's probably better just to define them as top-level properties of the actor.
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@smallcircles @mariusor @evan C2S is described (too loosely, but…) in the ActivityPub spec. There is a client and server aspect to C2S. A C2S client is software that uses that protocol/API to interact with an ActivityPub C2S-capable server (general or domain-specific). When I refer to an ActivityPub Client, I mean software using C2S rather than consumers of ActivityPub-related data in general.
@steve out of curiousity why do you make a difference between a consumer of AcitvityPub (assumedly you mean something that fetches ActivityPub using HTTP GET) and a C2S client?
My assumption is that if something fetches ActivityPub objects and is capable of rendering it to another representation for its users, that's a client to server client.
Client to server has two sections: consumer and producer and I think anything that fulfills any of those can be called a C2S client...
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That said, I think it would be great to have reverse chronological ordered collections of objects created by the actor.
It would be nice to use `streams` like `endpoints`, as an object, and define properties like `notes`, `images`, `places` and so on off of it.
Unfortunately the loose definition and lack of examples for `streams` makes it hard to use. It's probably better just to define them as top-level properties of the actor.
@steve @smallcircles I also agree that having a separate "home timeline" and "notifications timeline" makes sense. There's an open user story for that:
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@steve @smallcircles I also agree that having a separate "home timeline" and "notifications timeline" makes sense. There's an open user story for that:
The way I see it, this has the wrong stakeholder name of "ActivityPub API client developer" i.e. spec implementer, and a Home Feed is something I may want as a "Solution developer" stakeholder. In other words that library or SDK that offers me the Social API should allow me to model that.
The user story was also brought up by Mastodon, a Microblogging solution built on top of AP (ideally).
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> I think it's fair to call the outbox the actor's 'feed'?
The actor's event bus in a pure event based approach.
Does that break AP? Current fediverse?
Can AP be considered an event-driven architecture of sorts (or restrained as such in a solution design)?I really like the Motivating use cases section of the AS specs, and the primer that sits on the W3C wiki to that. Those might be further formalized so they are applied consistently.
@smallcircles @steve I know what an "event bus" is but I don't think it applies here. Usually it means a global data structure that attached processes can add events to and read events from. We don't have that in ActivityPub.
I think it's fair to say that activities are like events.
I also like the use cases and primer.
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The way I see it, this has the wrong stakeholder name of "ActivityPub API client developer" i.e. spec implementer, and a Home Feed is something I may want as a "Solution developer" stakeholder. In other words that library or SDK that offers me the Social API should allow me to model that.
The user story was also brought up by Mastodon, a Microblogging solution built on top of AP (ideally).
@smallcircles @steve please comment on the issue!
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@steve out of curiousity why do you make a difference between a consumer of AcitvityPub (assumedly you mean something that fetches ActivityPub using HTTP GET) and a C2S client?
My assumption is that if something fetches ActivityPub objects and is capable of rendering it to another representation for its users, that's a client to server client.
Client to server has two sections: consumer and producer and I think anything that fulfills any of those can be called a C2S client...
@mariusor @smallcircles @evan C2S has client-side and server-side aspects (different, but overlapping, behavioral requirements, etc.). Both sides consume *and* produce AP data (pull and push for S2S, currently only pull for C2S). Fetching AP data (URI dereferencing) is common to both C2S and S2S.
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@mariusor @smallcircles @evan C2S has client-side and server-side aspects (different, but overlapping, behavioral requirements, etc.). Both sides consume *and* produce AP data (pull and push for S2S, currently only pull for C2S). Fetching AP data (URI dereferencing) is common to both C2S and S2S.
@steve yes, but something dumb that only fetches a URL and converts the resulting ActivityPub into a valid other type of representation is a valid client in my opinion. That's what I mean, was that unclear?
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@mariusor @smallcircles @evan C2S has client-side and server-side aspects (different, but overlapping, behavioral requirements, etc.). Both sides consume *and* produce AP data (pull and push for S2S, currently only pull for C2S). Fetching AP data (URI dereferencing) is common to both C2S and S2S.
@steve @mariusor @smallcircles @evan this is a huge thread, but off-cuff comment: C2S will need a "proxy" where you can fetch a remote object **with** identity/authentication
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@steve @mariusor @smallcircles @evan this is a huge thread, but off-cuff comment: C2S will need a "proxy" where you can fetch a remote object **with** identity/authentication
@thisismissem I have just implemented that for the GoActivityPub servers and it's easier than it sounds.
The only important step required is to convert the client authorization token (presumably an OAuth2 bearer token) to a valid actor and then further to a valid Private Key with which to sign the remote request. After that the only thing remaining is to pipe verbatim the received response to the client...
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@smallcircles @steve I know what an "event bus" is but I don't think it applies here. Usually it means a global data structure that attached processes can add events to and read events from. We don't have that in ActivityPub.
I think it's fair to say that activities are like events.
I also like the use cases and primer.
Well, but a part of the specs can certainly be considered a message bus with channels conceptually.
Channel is the name that AsyncAPI uses, which maps to domain aggregates and actor streams.
But considering things purely event-based is stretching it, and may be better to discern between commands and events.
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@steve @mariusor @smallcircles @evan this is a huge thread, but off-cuff comment: C2S will need a "proxy" where you can fetch a remote object **with** identity/authentication
@thisismissem @steve @mariusor @smallcircles @evan
Just checking my memory.. this concept exists already, yes?
https://www.w3.org/wiki/ActivityPub/Primer/proxyUrl_endpoint
Are you just saying that the new API spec should include this? Or am I missing something?
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@steve yes, but something dumb that only fetches a URL and converts the resulting ActivityPub into a valid other type of representation is a valid client in my opinion. That's what I mean, was that unclear?
@mariusor @smallcircles @evan I *think* it’s
clear. I agree it’s a kind of “client”, just not necessarily a C2S client. -
@thisismissem @steve @mariusor @smallcircles @evan
Just checking my memory.. this concept exists already, yes?
https://www.w3.org/wiki/ActivityPub/Primer/proxyUrl_endpoint
Are you just saying that the new API spec should include this? Or am I missing something?
@benpate @thisismissem @steve @mariusor @smallcircles
Yes, proxyUrl already exists. There's a use case here:
https://github.com/swicg/activitypub-api/issues/10
The only other way I've seen this use case discussed is with client-side HTTP Signature keys. There's some kind of negotiation between the server and the client, and then the client can make requests to remote servers using HTTP Signature and a key it controls.
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@mariusor @smallcircles @evan I *think* it’s
clear. I agree it’s a kind of “client”, just not necessarily a C2S client.@steve OK, but why?
I feel like I explained my position relatively clearly, I would like to understand yours, even though I feel some animosity has started to crop up.
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Well, but a part of the specs can certainly be considered a message bus with channels conceptually.
Channel is the name that AsyncAPI uses, which maps to domain aggregates and actor streams.
But considering things purely event-based is stretching it, and may be better to discern between commands and events.
@smallcircles @steve maybe? I guess you could consider the `sharedInbox` to be like that.
I think that activities sent to the API by a client are kind of like commands, but they can also be events that happened on a different system.
If I got an achievement in a game, and that was sent as an activity to the API, it's more like an event notification than a command.
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@steve OK, but why?
I feel like I explained my position relatively clearly, I would like to understand yours, even though I feel some animosity has started to crop up.
@mariusor @smallcircles @evan No animosity here. However, I’m not sure how to explain it more clearly. I’m referring to C2S as described in chapter 6 of the ActivityPub specification (and the conformance profiles in Section 2.1). It sounded to me like you’re using a more general definition of “client”, which is fine, just different in significant ways (if it only dereferences and renders AP data).
