#meta 2023-10-07

2023-10-07 UTC
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catgirlin.space edited /Luau (+601) "add compat section" (view diff)
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Loqi [New Event] david.shanske.com created "Oct 11, 2023 6:00pm Homebrew Website Club - Pacific" https://events.indieweb.org/B2Q8dkmuv36x
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kaja.sknebel.net edited /User:Kaja.sknebel.net/upcoming-hwcs (+163) "update from events.indieweb.org" (view diff)
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www.jvt.me edited /digital_garden (+270) (view diff)
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aaronpk ok going to try the slack gateway update now since it's pretty quiet in here and i have some time
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GWG aaronpk: Exciting
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aaronpk something is wrong, debugging now
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[aaronpk] one more time
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[aaronpk] hi?
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[aaronpk] there we go
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GWG Hi, aaronpk and [aaronpk]
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[schmarty] Hooray aaronpk++
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Loqi aaronpk has 23 karma in this channel over the last year (108 in all channels)
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capjamesg aaronpk++
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Loqi aaronpk has 24 karma in this channel over the last year (109 in all channels)
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[catgirlinspace] aaronpk++
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Loqi aaronpk has 25 karma in this channel over the last year (110 in all channels)
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[catgirlinspace] wait that isn’t how it works
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[catgirlinspace] https://chat-uploads.indieweb.org/files/2023/10/meta-20231007-172105-image_from_ios.jpg
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[catgirlinspace] [aaronpk] uhhh something seems off me think…
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aaronpk uhoh
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[aaronpk] why is it doing that for you but not everyone else...
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[catgirlinspace] i’m special
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[catgirlinspace] i have a silly twin me now :3
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sknebel hah
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[catgirlinspace] i can meow at myself now :3 meow
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aaronpk working on it
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c​apjamesg 🤣
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aaronpk test
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[aaronpk] test
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aaronpk [catgirlinspace] can you say something again?
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[catgirlinspace] meow
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[catgirlinspace] am still special :3
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aaronpk aha that was my suspicion... apparently your slack user ID is more than 9 characters :D
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[catgirlinspace] yay
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Loqi 😊
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[catgirlinspace] hi loqi
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aaronpk i need a hash algorithm that results in exactly 10 chars using A-Za-z0-9
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[catgirlinspace] don’t have any ideas, me sucks at hash stuff >.<
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aaronpk or i cross my fingers that there will never be 2 slack users in here with the same 10-char subtring of the user ID that I use
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sknebel oh, username length limit?
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[catgirlinspace] wait can the user id be like, made into a binary string or something
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[catgirlinspace] i do something silly like that for static file names
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aaronpk yeah, IRC usernames are limited to 10 chars
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aaronpk my anecdata was seeing that slack user IDs were 9-10 chars
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[aaronpk] ping
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Loqi pong
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[aaronpk] [catgirlinspace] ok try one more time
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sknebel [aaronpk]: really only a-z+numbers? otherwise I'd have said hash->urlsafe-base64->truncate
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sknebel with hash really being any hash function to taste
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sknebel (that'd have - and _ in addition)
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aaronpk full charset is 0-9 A-Z a-z [ \ ] ^ _ ` { | } ~ - .
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sknebel then my suggestion works
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aaronpk i guess the question is, are the odds of a hash collision of a truncated hash better or worse than a slack user ID collision of the last 10 chars of a slack user ID
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sknebel good question
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sknebel depends how slack IDs work, and of course we dont know that
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aaronpk given that newer users seem to have longer ID, I assume they are somewhat sequential
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aaronpk officially they are opaque https://api.slack.com/changelog/2016-08-11-user-id-format-changes
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sknebel aaronpk: and this only would cuase them to look like the same user to the network, right?
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sknebel because we dont rely on this anywhere?
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aaronpk yeah, the goal is to have a stable user ID for slack users for the IRC network
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aaronpk prior to this change, the username was always "slackuser" for all users of the bridge
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sknebel then I'd say its fine to just take the end, a collision causing issues seems quite unlikely then
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sknebel yeah
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sknebel I guess hash would protect against slack suddenly putting forbidden chars in the ID
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aaronpk oh yeah good point, maybe that's a better plan then
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aaronpk i wish i knew how to do the math on calculating hash collision probabilities of just a substring of the hash
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aaronpk it's probably fine, i just want to make sure it's not going to be significantly worse
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aaronpk 10 chars ends up being about 1/4 of the sha256 hash
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aaronpk so does that mean the odds of a collision of the substring are 4x the odds of a collision of the full string?
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sknebel assuming the hash function is proper, its purely dependent on how many bits you use. birthday problem
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aaronpk right so i'm using about 1/4 of the bits
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capjamesg What is a bit?
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Loqi bit is an experiment to have a non-centalized TLD when domains can be bought with namecoin (cryptocurrency) instead of just via registrars https://indieweb.org/.bit
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capjamesg Haha
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capjamesg Loqi, we need to improve your information theoretic literacy :D
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sknebel !calc 2^((64/8*10)/2)
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Loqi 0
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sknebel !calc 2**((64/8*10)/2)
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Loqi 0
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sknebel sigh, what syntax does WA use ...
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sknebel okay, on the web it works
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aaronpk !calc 2^((64.0/8.0*10.0)/2.0)
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Loqi 1099511627776
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sknebel !calc 2^((6.0*10.0)/2.0)
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Loqi 1073741824
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sknebel actually
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sknebel that's how many users you need for a 50% chance there is a collision
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aaronpk that should last us a while then
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sknebel one-percent chance should still be somewhere in the millions
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Zegnat We will need an IndieWeb Eternal September before we need to worry about that one
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aaronpk ok hold on to your hats. testing in production
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aaronpk i would test in dev but it's a lot of work to spin up all the stuff needed to test with actual slack
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[aaronpk] hi
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[aaronpk] ping
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Loqi pong
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[aaronpk] ok there we go
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capjamesg ping
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Loqi pong
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[catgirlinspace] meow meow
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[catgirlinspace] me not special anymore?
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[catgirlinspace] :(
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aaronpk yay
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Loqi 😊
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aaronpk still special, just in a different way :)
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[catgirlinspace] o
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[catgirlinspace] yay :3
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gregorlove.com edited /Luau (+37) "link dfn, a bit more succinct" (view diff)
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gregorlove.com edited /Lua (-6) "link dfn, /nginx" (view diff)
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[tantek] but << {{relevance needed}}
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Loqi Sorry, I couldn't find a page named "but" or similar
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[tantek] bit << {{relevance needed}}
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Loqi ok, I added "{{relevance needed}}" to a brand new "See Also" section of /.bit https://indieweb.org/wiki/index.php?diff=89706&oldid=29226
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loqi.me edited /.bit (+40) "[tantek] added "{{relevance needed}}" to "See Also"" (view diff)
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[tantek] aaronpk, late reply, however consider mapping usernames <= 10 chats 1:1 and for 11+ chars, map the first 7 chars literally then hash the remaining chars from position 8 on up or the username into the last 3 chars of the mapped username
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aaronpk too late
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[tantek] Thought it might be yeah. Anyway that's my brainstorm
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aaronpk oops crap i broke the web gateway
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aaronpk test
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aaronpk test
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[aaronpk] hi from slack
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aaronpk_web_test hi from web
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aaronpk_web_test yay
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GWG We need more aaronpk's
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capjamesg We need more GWGs.
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GWG GWG, gwg, or gwg_ ?
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