Improve lemmy compatibility

[pfefferle]

Improve the compatibility with lemmy! Thanks @Nutomic for the feedback https://socialhub.activitypub.rocks/t/discourse-wordpress-integration/4162/13?u=pfefferle

[Nutomic]

That's great! You can test it with voyager.lemmy.ml which has the latest changes deployed.

[pfefferle]

@Nutomic can you approve my request?

[Nutomic]

Ive approved it.

[pfefferle]

@Nutomic I messed up my password and it seems to not send password reset mails 🫣

[Nutomic]

It should be able to send emails, maybe it went to spam? Otherwise just register another account.

[pfefferle]

made a second account

[pfefferle]

@Nutomic OK, seems to work, at least following, but posts seems to not be federated properly?!?

Here is an example JSON: https://pfefferle.org/hello-lemmy-part2/?activitypub

[Nutomic]

I was able to fetch it without any problems. Maybe Lemmy couldnt parse the activity you sent? Can you show the json for that?

[pfefferle]

All test posts here: https://pfefferle.org/

You can add ?activitypub at the end of each post to see the JSON.

[pfefferle]

I will try to debug the Lemmy response later today!

[pfefferle]

FYI: The post will be federated by the User and Announced by the Group. But the Announce Object is only the Link to the Post, is that supported by Lemmy or does it need the full object as the Announce object?

[pfefferle]

@Nutomic the request is:

{
    "@context": [
        "https:\/\/www.w3.org\/ns\/activitystreams"
    ],
    "id": "https:\/\/pfefferle.org\/lemmy-part-4\/#activity",
    "type": "Announce",
    "published": "2024-05-03T12:32:29Z",
    "updated": "2024-05-06T08:03:39Z",
    "to": [
        "https:\/\/www.w3.org\/ns\/activitystreams#Public",
        "https:\/\/pfefferle.org\/wp-json\/activitypub\/1.0\/actors\/0\/followers"
    ],
    "cc": [],
    "object": "https:\/\/pfefferle.org\/lemmy-part-4\/",
    "actor": "https:\/\/pfefferle.org\/@pfefferle.org"
}

The response is:

[body] => {"error":"unknown","message":""}
[response] => Array
   (
        [code] => 400
        [message] => Bad Request
   )

[pfefferle]

Tried it with object instead of URI, with the same result: Error 400

{
    "@context": [
        "https:\/\/www.w3.org\/ns\/activitystreams"
    ],
    "id": "https:\/\/pfefferle.org\/lemmy-part-4\/#activity#activity",
    "type": "Announce",
    "audience": "https:\/\/pfefferle.org\/@pfefferle.org",
    "published": "2024-05-03T12:32:29Z",
    "updated": "2024-05-06T08:20:33Z",
    "to": [
        "https:\/\/www.w3.org\/ns\/activitystreams#Public",
        "https:\/\/pfefferle.org\/wp-json\/activitypub\/1.0\/actors\/1\/followers"
    ],
    "cc": [],
    "object": {
        "id": "https:\/\/pfefferle.org\/lemmy-part-4\/#activity",
        "type": "Update",
        "audience": "https:\/\/pfefferle.org\/@pfefferle.org",
        "published": "2024-05-03T12:32:29Z",
        "updated": "2024-05-06T08:20:33Z",
        "to": [
            "https:\/\/www.w3.org\/ns\/activitystreams#Public",
            "https:\/\/pfefferle.org\/wp-json\/activitypub\/1.0\/actors\/1\/followers"
        ],
        "cc": [],
        "object": {
            "id": "https:\/\/pfefferle.org\/lemmy-part-4\/",
            "type": "Article",
            "attachment": [],
            "attributedTo": "https:\/\/pfefferle.org\/author\/pfefferle\/",
            "audience": "https:\/\/pfefferle.org\/@pfefferle.org",
            "content": "\u003Cp\u003EIdentifies one or more entities that represent the total population of entities for which the object can considered to be relevant. Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.          \u003C\/p\u003E",
            "contentMap": {
                "en": "\u003Cp\u003EIdentifies one or more entities that represent the total population of entities for which the object can considered to be relevant. Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.          \u003C\/p\u003E"
            },
            "name": "Lemmy (Part 4)",
            "published": "2024-05-03T12:32:29Z",
            "summary": "Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant. Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object can considered to be relevant.Identifies one or more entities that represent the total population of entities for which the object [...]",
            "tag": [],
            "updated": "2024-05-06T08:20:33Z",
            "url": "https:\/\/pfefferle.org\/lemmy-part-4\/",
            "to": [
                "https:\/\/www.w3.org\/ns\/activitystreams#Public",
                "https:\/\/pfefferle.org\/wp-json\/activitypub\/1.0\/actors\/1\/followers"
            ],
            "cc": []
        },
        "actor": "https:\/\/pfefferle.org\/author\/pfefferle\/"
    },
    "actor": "https:\/\/pfefferle.org\/@pfefferle.org"
}

[Nutomic]

Right Lemmy only supports Announce with embedded object for now, no link. Ive thrown the last activity you sent into our tests and it passes just fine (after replacing \/ with /).

Looking at voyager.lemmy.ml, it appears that you sent an activity with the same id https://pfefferle.org/lemmy-part-4/#activity three days ago already. That means Lemmy will reject it as duplicate. You need to generate a new activity id if you want to send something new.

[pfefferle]

OK, I have a working version now! 🎉

@Nutomic any chance that Lemmy will support URI objects soon? I am not sure if it is a good idea to change the current implementation, because I fear to break something else... 🫣

[Nutomic]

any chance that Lemmy will support URI objects soon? I am not sure if it is a good idea to change the current implementation, because I fear to break something else... 🫣

Unfortunately I wont be able to implement that anytime soon.

[pfefferle]

@Nutomic ok, then I will see how other platforms handle Announce objects, to get this merged.

[pfefferle]

@Nutomic It seems that I receive a 400 error on the Accept I sent to lemmy (@pfefferle.org@pfefferle.org)

Can you maybe help with debugging?

Here is an example of an Accept

{
    "@context": [
        "https:\/\/www.w3.org\/ns\/activitystreams"
    ],
    "id": "https:\/\/pfefferle.org\/@pfefferle.org#follow-lemmy.ml\/u\/pfefferle-1717694756",
    "type": "Accept",
    "to": "https:\/\/lemmy.ml\/u\/pfefferle",
    "object": {
        "id": "https:\/\/lemmy.ml\/activities\/follow\/2fdfb3f2-9f7e-44bf-bf26-c0d2cb371ebc",
        "type": "Follow",
        "object": "https:\/\/pfefferle.org\/@pfefferle.org",
        "actor": "https:\/\/lemmy.ml\/u\/pfefferle"
    },
    "actor": "https:\/\/pfefferle.org\/@pfefferle.org"
}