I hope more #ActivityPub implementations start properly handling JSON-LD documents in various forms, rather than using ad-hoc approaches like only allowing specific fields to accept both arrays and scalar values.
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I hope more #ActivityPub implementations start properly handling JSON-LD documents in various forms, rather than using ad-hoc approaches like only allowing specific fields to accept both arrays and scalar values.
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System shared this topic
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Or, just use a proper JSON-LD processor altogether. Of course, there would be a performance penalty. The #ActivityPub spec explicitly allows
as:Publicor barePublicfor public addressing into/cc, etc., but surprisingly many implementations don't handle this. All of this would actually be solved by using a JSON-LD processor. -
Honestly, I don't really care what strategy other #ActivityPub implementations follow to comply with the spec. (I solved it in #Fedify by just using a proper JSON-LD processor.) It's just a bit annoying that I always send valid JSON-LD documents, but whenever I encounter an interoperability bug where the other side can't process them, I'm the one who has to send them a patch to fix it.
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@hongminhee I ran into things like this with Mastodon. I send valid AP activities but if I don’t encode them in a specific way, Mastodon silently ignores them. Like how it assumes the object of a Create activity must be inline and not a reference, but the actor must be a reference and not inline.
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@hongminhee I ran into things like this with Mastodon. I send valid AP activities but if I don’t encode them in a specific way, Mastodon silently ignores them. Like how it assumes the object of a Create activity must be inline and not a reference, but the actor must be a reference and not inline.
@jamie@zomglol.wtf Yeah, exactly such kind of thing!
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R relay@relay.mycrowd.ca shared this topic
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Why don't you fix your software instead?
It sounds like you're referring to this issue:
[Federation]: `Create(Note)` with a single attachment is dropped because `Helpers::verifyAttachments` still assumes `attachment` is an array (follow-up to #6427) · Issue #6588 · pixelfed/pixelfed
Description PR #6427 made handleCreateActivity accept the JSON-LD 1.1 compact form of to/cc (single value instead of a one-element array). The same compaction rule applies to every set-valued property in Activity Streams 2.0, and one of ...
GitHub (github.com)
But in Fediverse,
attachmentis not supposed to be an object, it's an array.I don't think you should expect people to comply with your vision of ActivityPub.
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Why don't you fix your software instead?
It sounds like you're referring to this issue:
[Federation]: `Create(Note)` with a single attachment is dropped because `Helpers::verifyAttachments` still assumes `attachment` is an array (follow-up to #6427) · Issue #6588 · pixelfed/pixelfed
Description PR #6427 made handleCreateActivity accept the JSON-LD 1.1 compact form of to/cc (single value instead of a one-element array). The same compaction rule applies to every set-valued property in Activity Streams 2.0, and one of ...
GitHub (github.com)
But in Fediverse,
attachmentis not supposed to be an object, it's an array.I don't think you should expect people to comply with your vision of ActivityPub.
@silverpill@mitra.social Well, I fixed my software too:
Normalize outgoing JSON-LD for Pixelfed interop by dahlia · Pull Request #721 · fedify-dev/fedify
ActivityPub server framework in TypeScript. Contribute to fedify-dev/fedify development by creating an account on GitHub.
GitHub (github.com)
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@hongminhee Thank you
(my server can handle an object, but you do a favor to all who are only beginning to develop their fedi projects)
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Why don't you fix your software instead?
It sounds like you're referring to this issue:
[Federation]: `Create(Note)` with a single attachment is dropped because `Helpers::verifyAttachments` still assumes `attachment` is an array (follow-up to #6427) · Issue #6588 · pixelfed/pixelfed
Description PR #6427 made handleCreateActivity accept the JSON-LD 1.1 compact form of to/cc (single value instead of a one-element array). The same compaction rule applies to every set-valued property in Activity Streams 2.0, and one of ...
GitHub (github.com)
But in Fediverse,
attachmentis not supposed to be an object, it's an array.I don't think you should expect people to comply with your vision of ActivityPub.
> attachment is not supposed to be an object, it's an array.
@silverpill I don't understand how you infer that from this spec: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-attachment
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@hongminhee so, I've been dealing with this problem a lot with tags.pub.
I have found that many projects are open to issues and patches. Even if I have to downgrade what I'm sending over the wire to the least common denominator, I have some hope that the next people who build to the spec will get better interoperability.
I think having good libraries can make the JSON-LD easier.
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Why don't you fix your software instead?
It sounds like you're referring to this issue:
[Federation]: `Create(Note)` with a single attachment is dropped because `Helpers::verifyAttachments` still assumes `attachment` is an array (follow-up to #6427) · Issue #6588 · pixelfed/pixelfed
Description PR #6427 made handleCreateActivity accept the JSON-LD 1.1 compact form of to/cc (single value instead of a one-element array). The same compaction rule applies to every set-valued property in Activity Streams 2.0, and one of ...
GitHub (github.com)
But in Fediverse,
attachmentis not supposed to be an object, it's an array.I don't think you should expect people to comply with your vision of ActivityPub.
@silverpill @hongminhee single element arrays in JSON-LD go to the element itself, not an array.
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@hongminhee so, I've been dealing with this problem a lot with tags.pub.
I have found that many projects are open to issues and patches. Even if I have to downgrade what I'm sending over the wire to the least common denominator, I have some hope that the next people who build to the spec will get better interoperability.
I think having good libraries can make the JSON-LD easier.
@evan@cosocial.ca Can't agree more.
I think having good libraries can make the JSON-LD easier.
Yeah, that's one of reasons why I started Fedify; it was started from building a type-safe Activity Vocabulary library for TypeScript which lets me free from dealing with all complicated things about JSON-LD and keeping it standard-compliant at a time!
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> attachment is not supposed to be an object, it's an array.
@silverpill I don't understand how you infer that from this spec: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-attachment
@mariusor @silverpill @hongminhee yeah, that's definitely not what the spec says.
"The serialized JSON form of an Activity Streams 2.0 document MUST be consistent with what would be produced by the standard JSON-LD 1.0 Processing Algorithms and API [JSON-LD-API] Compaction Algorithm"
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@hongminhee So, I really appreciate that you are doing this work. I know it's hard, and it feels unrewarding, but it really matters, and it really helps the ecosystem.
Please let me know if I can help out in these efforts.
I hope that all of us in the ActivityPub community take these requests seriously when they come in.
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> attachment is not supposed to be an object, it's an array.
@silverpill I don't understand how you infer that from this spec: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-attachment
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@hongminhee the activitystrea.ms library does a pretty good job of parsing and generating AS2, in a uniform way. It pushes you into better habits, which I appreciate.
My book does bare-JSON parsing in all the major examples; I should probably change it in the next version.
Should we start a page for JSON-LD-based AS2 libraries? I think @cwebber did a good Python one, and there may be others.
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@mariusor @hongminhee I didn't infer that from the spec, it's how Fediverse works.
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@hongminhee the activitystrea.ms library does a pretty good job of parsing and generating AS2, in a uniform way. It pushes you into better habits, which I appreciate.
My book does bare-JSON parsing in all the major examples; I should probably change it in the next version.
Should we start a page for JSON-LD-based AS2 libraries? I think @cwebber did a good Python one, and there may be others.
@evan @hongminhee @cwebber could you share a link to that Python one?
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@evan @hongminhee @cwebber could you share a link to that Python one?
GitHub - w3c-social/activipy: ActivityStreams 2.0 python implementation and validation lib
ActivityStreams 2.0 python implementation and validation lib - w3c-social/activipy
GitHub (github.com)
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@mariusor @hongminhee I bet the software you're using right now always sends an array
@silverpill I do not bow to the Mastodon imperialism.
