this post was submitted on 08 Jun 2025
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Need help implementing ActivityPub - getting inconsistent results across platforms (blenderdumbass.org)
submitted 1 year ago by Madiator2011@lm.madiator.cloud to c/fediverse@lemmy.world
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My friend is working on adding ActivityPub support to his blog platform (BDServer) so people can follow/comment from Mastodon, Lemmy, etc.

Current status: Lemmy and Misskey can find and follow his account (@blenderdumbass@blenderdumbass.org), but Mastodon can't find it at all, even though he sees proper ActivityPub requests hitting his server.

The technical details are pretty gnarly - RSA signature verification, HTTP header recreation, multi-threading issues. He wrote up the full journey here: Please Help Me With Activity Pub

If anyone has ActivityPub experience or wants to take a look at the code (Python), we have a Matrix room for BDServer development. Any insights on why different platforms behave differently would be super helpful.

https://matrix.to/#/#bdserver:tchncs.de

Source code: ActivityPub.py

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[–] irelephant@lemmy.dbzer0.com 4 points 1 year ago* (last edited 1 year ago)

I just took another look at it,

Comparing it to another random note, the to and cc fields are supposed to be arrays, rather than just a string.

Its also missing a url field, which is supposed to link to the user-facing url of the post.

cc: @blenderdumbass@lm.madiator.cloud