#social 2018-09-25
2018-09-25 UTC
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# 
dansup pixelfed federation is almost ready :D
# dansup and it will bring ephemeral stories to the fediverse! https://mastodon.social/@pixelfed/100575877914080686
# dansup aaronpk: stories are basically DM's sent to all your followers that expire in 24h
# dansup true
# dansup there is nothing stopping anyone from copying anything. Most people know that
# dansup The same principal applies to deleting a status
# dansup it could have the same visibility, like a DM
# dansup you can screenshot a snapchat, people know that. You can't prevent it
# dansup if you are worried about your privacy, you probably wouldnt use this feature anyways
# rialtate[m] aaronpk: what articles about gargron?
# dansup aaronpk: I'm not worried, instagram is a lot different than twitter :)
# dansup its also a lot more popular :D
# dansup I'm working with anfora to develop a standard for ephemeral stories. https://mastodon.social/@pixelfed/100784534276161528
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# jdormit_mobile Articles about Gargrom I'm assuming are referring to the Wil Wheaton fiasco?
# jdormit_mobile s/Gargrom/gargron
# rialtate[m] Links?
# heluecht[m] Are there any test tools for checking LD signatures? A few times a day I'm getting invalid LD signatures. And I really want to know if the problem is on my or the remote side.
# heluecht[m] Alternatively it would be good to have some JSON-LD normalizer that is not digitalbazaar/json-ld.
# saranix heluecht[m]: https://json-ld.org/playground/ - probably uses that lib though
# heluecht[m] saranix: The normalised data from that page differs in some points from the one that I created with my used library. It would be good to know if that page uses some PHP library.
# heluecht[m] That library on that page does this "_:c14n?" thing in the different order.
# heluecht[m] If that page does it in the way that it is meant to be, then I'm really in need of a better lib.
# saranix heluecht[m]: afaik both were written by the same person... says a lot about how difficult it is to follow that spec :-)
# heluecht[m] I really don't want to write my own normalizer ...
# nightpool[m] > <@heluecht:feneas.org> I really don't want to write my own normalizer ...
# nightpool[m] can you give me an example of the normalization difference heluecht?
# nightpool[m] ughhh weird unclear riot quoting lol
# heluecht[m] Yeah, take this one:
# heluecht[m] http://tinyurl.com/yazbt5ao
# heluecht[m] Just compare the last lines with these ones:
# heluecht[m] sent a long message: heluecht[m]_2018-09-25_16:46:46.txt <https://matrix.cybre.space/_matrix/media/v1/download/cybre.space/JjpfcAXyaernMTlaoIsQTCsf>
# heluecht[m] You see that the " :c14n1" and ":c14n0" are reversed.
# heluecht[m] On my system the "source" element gets the " :c14n0", the "tag" element gets the ":c14n1".
# heluecht[m] And the official (?) normalizer at that page does it in the opposite way.
# heluecht[m] This line is the source of the problem: https://github.com/digitalbazaar/php-json-ld/blob/master/jsonld.php#L2821
# heluecht[m] I just changed it from a "sort" to a "rsort" and some message that previously wasn't valid, was checked valid.
# heluecht[m] Meh ...
# saranix it makes more sense that the attributes would be in alphabetical order. It probably says as much in the spec, but good luck finding it :-) I would guess the playground one is wrong. I don't think it's maintained as frequently as the lib either...
# heluecht[m] The lib that I'm using had been changed several years ago ...
# heluecht[m] Oh, and another test had failed. So there seems to be other problems as well.
# saranix yeah reversing it was probably just coincidence. it's probably random order on the playground one
# heluecht[m] I can reproduce the problem by sending me a message with a mention and a tag.
# heluecht[m] So Mastodon is using some library that does this differently than my library.
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# puckipedia ok maybe normalization isn't quite as difficult as i thought
# heluecht[m] Why do you think so?
# puckipedia the spec is kinda difficult to read compared to other stuff
# heluecht[m] So why do you think it isn't that difficult?
# puckipedia i've got most of this code manually written already. normalization is a lot of hashing mostly
# puckipedia like, i implemented the JSON-LD completely myself
# heluecht[m] You aren't doing this in PHP, I guess?
# puckipedia nope
# heluecht[m] Could you? :-D
# heluecht[m] Question is, where's the problem with my library - and can it be fixed?
# puckipedia hmm
# puckipedia lemme see
# puckipedia got it
# puckipedia or well
# puckipedia lemme see
# puckipedia heluecht[m]: ok, so without cheating
# puckipedia what does this output
# puckipedia :)
# heluecht[m] It should show the 4e99 at first, I guess?
# puckipedia hah nope
# puckipedia it sorts it as 5e5, then 4e99
# heluecht[m] Why?
# puckipedia integers :D
# puckipedia so i'm guessing this is your issue
# heluecht[m] So it expands the 5e5 to some 5 with 5 zeros?
# heluecht[m] Or what?
# puckipedia yes
# puckipedia heluecht[m]: try replacing sort($hashes); with sort($hashes, SORT_STRING);
# puckipedia no idea how much this'll help but i feel this might cause the issue
# puckipedia but only sometimes :D
# puckipedia ... tbh, not sure what'll happen anyways with some other code which has this same issue
# puckipedia you may want to look at this as well??
# puckipedia sorry, not a great php'er but I know the traps people fall in
# heluecht[m] Changing this for the hashes doesn't change anything :-(
# heluecht[m] I will have a look at the other place as well.
# heluecht[m] Why in the world is someone putting stuff together, hashing it with "sha1" and is sorting this hash?
# heluecht[m] Which drug caused such thinking?
# heluecht[m] puckipedia: I suggest that you are implementing this by yourself. After this is done we can compare the results.
# puckipedia it's probably gonna take a while because json-ld isn't high on my prioerity
# heluecht[m] I hate this stuff already.
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# dansup heh
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# heluecht[m] args ...
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