urlopen method in Perl 6? - raku

Question

I'm translating a Python module to Perl 6, but can't find a method called urlopen, which could accept data:
from six.moves.urllib import request
req = request.Request(url, headers=headers)
if headers.get('Content-Type') == 'application/x-www-form-urlencoded':
data = oauth_query(args, via='quote_plus', safe='').encode()
elif 'form-data' in headers.get('Content-Type', ''): # multipart/form-data
data = args['form-data']
else:
data = None
resp = request.urlopen(req, data=data)
resp.json = lambda: json.loads(resp.read().decode() or '""')
return resp
oauth_query is a method that return a sorted string:
def oauth_query(args, via='quote', safe='~'):
return '&'.join('%s=%s' % (k, oauth_escape(v, via, safe)) for k, v in sorted(args.items()))
I translate the above code to Perl 6:
use WWW;
my $data = "";
if %headers{'Content-Type'} eq 'application/x-www-form-urlencoded' {
$data = oauth_query(%args);
} elsif %headers{'Content-Type'}.contains('form-data') {
$data = %args{'form-data'};
} else {
$data = Any;
}
my $res = get $url, |%headers; # but without data that contains Content-Type, it will
# Died with HTTP::MediaType::X::MediaTypeParser::IllegalMediaType
I want to return a resp as in Python. Any help is welcome!

Answer 1

I have reduced the program to the bare minimum; you will still have to take care of headers and the OAuth query, but this works
use WWW;
sub MAIN( :$have-data = 0 ) {
my $url='https://jsonplaceholder.typicode.com/posts/';
my %args=%(form-data => "userId=1&id=2");
my $data = "";
if $have-data {
$data = %args{'form-data'};
}
my $res;
if $data {
$res = post $url, $data;
} else {
$res= get $url~'1';
}
say $res;
}
Baseline is that urlopen in Python does get or post depending on whether there is data or not. In this case, I use a simple if for that purpose, since WWW is quite barebones and does not support that. I am using also a mock REST interface, so I have actually to change the URL depending on the data, which is also dummy data. You can call the program either with no argument or with
perl6 urlopen.p6 --have-data=1
and the mock server will return... something. It would be great if you contributed a module with a (somewhat) higher level than WWW, or to WWW itself. Hope this solves (kinda) your problem.

Answer 2

use Cro::HTTP::Client;
my $resp;
my $data = "";
if (%headers{'content-type'} // '') eq self.form_urlencoded {
$data = oauth_query(%args);
} elsif (%headers{'content-type'} // '').contains('form-data') { # multipart/form-data
$data = %args{'form-data'};
} else {
$data = "";
}
my $client = Cro::HTTP::Client.new(headers => |%headers);
if $data {
$resp = await $client.post: $url, body => |%args;
} else {
$resp = await $client.get: $url;
}
return $resp;