NodeBB <> Lemmy federation issue (re: nullable image/icon)
Technical Discussion
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nutomic@lemmy.ml reported a federation issue with a NodeBB instance and we debugged it. It turns out Lemmy is unable to handle actors who have
imageoriconset tonull.Lemmy is taking steps to handle this (source, source), and NodeBB will update its actor logic to omit properties without an avatar or cover photo set.
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undefined NodeBB shared this topic on
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evan@cosocial.ca I had no idea that was the case. That is very good to know and having it called out in some sort of best practices doc (an existing w3c explainer?) would be helpful :smile:
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NodeBB v4.6.1 contains the fix so that if an avatar and cover photo are not set, they are not included in the ActivityPub actor data.
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@julian @evan aside from potentially causing null pointer exceptions when you try to dereference null, using null is equivalent to just leaving out the statement in the first place. there's no reason to use null. the only time you'd need null values is if your schema required a certain key to be present but allowed the value to be nullable, which is generally a bad idea compared to just making the key optional. tony hoare, the inventor of null, called it their "billion-dollar mistake".
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@julian @evan aside from potentially causing null pointer exceptions when you try to dereference null, using null is equivalent to just leaving out the statement in the first place. there's no reason to use null. the only time you'd need null values is if your schema required a certain key to be present but allowed the value to be nullable, which is generally a bad idea compared to just making the key optional. tony hoare, the inventor of null, called it their "billion-dollar mistake".
trwnh@mastodon.social said in NodeBB <> Lemmy federation issue (re: nullable image/icon):
> using null is equivalent to just leaving out the statement in the first place.That's not true, there are specific scenarios where having an explicit "no value" is significant vs "missing value"...
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@julian if you give me any specific examples of when you would want to use null, i can recommend better alternatives. generally, it's always possible that there is missing information.
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@julian love to see the reports of cross project colab!
Gli ultimi otto messaggi ricevuti dalla Federazione
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I'm looking into federating out deletion of contexts because in NodeBB the concept of a topic is a discrete entity, not tied to the posts contained within. Deleting the top-level post would not alter the topic in any way, except perhaps that the next oldest reply is suddenly promoted to top-level, which is odd.
Conversely, in ActivityPub, there either is no concept of a context (threaded objects only), or merely the suggestion of one as a view (current implementations of resolvable contexts). I'm hoping to move this more towards contexts as discrete entities with their own activities.
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@julian love to see the reports of cross project colab!
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@elvecio Further investigation showed that this wasn't a Mastodon's fault. There was some weirdness on behalf of the originating instance.
Mastodon server received a post addressed to public and I received a post addressed to followers.
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@silverpill
For superior control of your content, suggest to use hubzilla
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@silverpill One thing that has always been different in Mike's software is that only authorized people can see non-public things. It is of little use to have the right address for the image, video, or file (as instead happens and happened in Mastodon Diaspora and others - almost all of them). In the software created by him, you cannot see even if you have an address/id or whatever you like.
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@julian Well, it's public now. But it wasn't when I posted :)
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"Mastodon may expose followers-only posts to public. Is it a feature or a bug?"
I hate to break this to you, but I'm seeing this on a v4.4.3 #Mastodon instance in my /home only because of the #Hashtag #Iceshrimp you've used, which I #Follow
Don't know if this is good news or bad news, or none of the above
cc @kopper
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@silverpill It breaks FO, so this is a feature.
