crystal-lang/crystal

The Crystal programming language | http://crystal-lang.org | Fund Crystal's development: http://is.gd/X7PRtI | Docs: http://crystal-lang.org/docs/ | API: http://crystal-lang.org/api/

Quinton Miller

@HertzDevil

is there a design reason that x.as?(T) isn't equivalent to x if x.is_a?(T)

(the difference is that the former returns a T? and the latter returns a (typeof(x) & T)?)

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@FromIRC

<yxhuvud> subclasses?

Quinton Miller

@HertzDevil

why do you think so

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@FromIRC

<yxhuvud> no good reason.

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@FromIRC

<yxhuvud> looking at the documentation for as, I guess the upcast possibility to union type could be responsible?

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@FromIRC

<yxhuvud> ie it allows you to do things like [1.as?(Int32|String)] << "hello" which is not possible using 1 if 1.is_a?(Int32|String) instead

Quinton Miller

@HertzDevil

oh yeah upcasts

what about x.as?(T) versus x.as(T) if x.is_a?(T)

Lance Dillon

@riffraff169

as a not quite rabbit expert, running rabbit in a container is very simple, so not much required to use it...it would be simple to use for your app

Lance Dillon

@riffraff169

could even have a script that starts the rabbit container, runs your app, then when app quits, rabbit quits

George Dietrich

@Blacksmoke16

GC Warning: Finalization cycle involving 0x7f8dc9e7eea0

nice, thats a new one

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@FromIRC

<postmodern> what is IO::ARGF ?

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/master/toplevel.html#ARGF

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@FromIRC

<postmodern> ah ha. hmm now to figure out why it's showing up in my specs when i am clearly calling IO::Memory#gets

George Dietrich

@Blacksmoke16

:thinking:

Jonathan Silverman

@mixflame

my site has gotten even better. now features a shared video player in rooms (+ video/audio calls + collaborative text editor + collaborative painting + html chat)

crystal + amber + websockets + mediaelement.js

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<kevinsjoberg> Do we have some guidelines for the Crystal tooling repositories? I've been contributing to the Crystal TextMate bundle fairly frequently and just noticed I have merge rights (I'm part of Crystal Tooling). I just submitted a PR but not sure who would be suitable for review. Would people be okay with me just merging the fix?

<kevinsjoberg> See crystal-lang-tools/Crystal.tmbundle#22 for details.

George Dietrich

@Blacksmoke16

for simple stuff like this id prob just merge it

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<kevinsjoberg> @Blacksmoke16, alright. Sweet. 🙂

George Dietrich

@Blacksmoke16

it looks good to me fwiw ;P

mrx

@perfecto25

hello, Im on crystal 1.0.0, running basic logger output,

require "logger"

log = Logger.new(STDOUT)
log.level = Logger::WARN

log.debug("Created logger")
log.info("Program started")
log.warn("Nothing to do!")

getting

require "logger"
^
Error: can't find file 'logger'

running on linux mint 20.1

George Dietrich

@Blacksmoke16

It's require log

Logger was the old version

mrx

@perfecto25

thx, was looking at old docs

George Dietrich

@Blacksmoke16

https://crystal-lang.org/api/Log.html is the one you want to use now. One you're using atm is the legacy one

:thumbsup:

Rishav Sharan

@rishavs

I am trying to verify google/AWS jwts using their public keys but not succeeding. Would anyone know how to do so?
For eg.
the google sign ins key is at;

pp! pub_key_jwk = HTTP::Client.get "https://www.googleapis.com/oauth2/v3/certs"
pp! pub_key_pem = HTTP::Client.get "https://www.googleapis.com/oauth2/v1/certs"

and I would want to decode like this;
payload, header = JWT.decode(token, pub_key_pem , JWT::Algorithm::HS256)
But I couldn't find a way to do this using https://github.com/crystal-community/jwt#usage

Ary Borenszweig

@asterite

I was also thinking that x.as?(T) could be rewritten as an if with is_a?... It's simpler for the compiler, no need to have extra logic

jhass

@jhass:m.aeshna.de

[m]

@rishavs: neither endpoint returns the expect PEM encoded key directly, the first returns a list of JWKs, the second returns a list of PEM encoded keys (certificates actually). the jwt's shard key argument expects the PEM encoded key directly, so you need to some parsing and extraction first. Second I don't know how you arrived at HS256 as algorithm, it's RSA keys so you'll want RS256, RS384 or RS512 respectively, whichever one the JWT actually uses. Admittedly the shard could be more helpful here and extract the right algorithm from the JWT header

Rishav Sharan

@rishavs

@jhass:m.aeshna.de , I did try to extract the keys and then use it in JWT decode, but that didn't work;


            # Fetch the Google public key
            pp! pub_key_jwk = HTTP::Client.get "https://www.googleapis.com/oauth2/v3/certs"
            pp! pub_key_pem = HTTP::Client.get "https://www.googleapis.com/oauth2/v1/certs"
            # pub_key.status_code      # => 200

            pp! parsed = JSON.parse(pub_key_jwk.body)
            pp! key1 = parsed["keys"][0]["kid"].to_s
            pp! key2 = parsed["keys"][1]["kid"].to_s

            payload1, header1 = JWT.decode(id_token, key1, JWT::Algorithm::RS256)
            pp! payload1
            pp! header1

would throw;

2021-07-05T09:51:34.441087Z  ERROR - Neither PUB or PRIV key: error:0D06B08E:asn1 encoding routines:asn1_d2i_read_bio:not enough data
Neither PUB or PRIV key: error:0D06B08E:asn1 encoding routines:asn1_d2i_read_bio:not enough data (OpenSSL::PKey::RsaError)

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@FromIRC

<jhass[m]> Well yes, a JWK's kid field is not a PEM encoded public key. https://datatracker.ietf.org/doc/html/rfc7517#section-4.5

Rishav Sharan

@rishavs

Is this bit of string

"-----BEGIN CERTIFICATE-----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\nu/lQUGTPW3NLCn0id4AKAx3Ojf0t2jhsPy9u7kW5mPQA/CeRWjsPZ2uX\n-----END CERTIFICATE-----\n"

what I need in my JWT.decode(id_token, key_pem, JWT::Algorithm::RS256)?

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@FromIRC

<jhass[m]> I guess, try it!

Rishav Sharan

@rishavs

getting a slightly different error now;

2021-07-05T14:12:29.721163Z  ERROR - Neither PUB or PRIV key: error:0909006C:PEM routines:get_name:no start line
Neither PUB or PRIV key: error:0909006C:PEM routines:get_name:no start line (OpenSSL::PKey::RsaError)

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<jhass[m]> https://stackoverflow.com/a/63042717/2199687

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<kevinsjoberg> If I define a macro in a shard, and then call this macro from a project using this shard, shouldn't that work?

<kevinsjoberg> I would expect the macro (it creates a method based on input) to be present, but it doesn't seem to be the case.

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@FromIRC

<kevinsjoberg> Basically, I expected the following to work. https://play.crystal-lang.org/#/r/bh8i

<kevinsjoberg> But if I uncomment the last code, it does not compile.

<kevinsjoberg> Oh, I'm dumb. Never mind, haha.

<kevinsjoberg> This works, https://play.crystal-lang.org/#/r/bh8o. I realized self is something else entirely when calling it outside the MyShard namespace.

Lewis E. Bogan

@lebogan

More with the raspberry pi compiling. So I'm clear: I need the current crystal version to compile the current crystal? I user the Portalier 0.33.0 and it compiled 0.33.0 but not 0.36.1. I got an error

In src/number.cr:147:67

 147 | def step(*, to limit = nil, by step, exclusive : Bool = false, &) : Nil
                                                                       ^
Error: duplicated argument name: 
make: *** [Makefile:122: .build/crystal] Error 1

The same happened when trying to compile 1.0.0.
Thanks

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