1. Perl Web API
Web API Perl
yusukebe
2010/07/23
Yokohama.pm#6 x PerlCasual#3

2. • Perl
• Web API &&Perl
• /
– LWP::*
•
– 20 : Web API ←
– 30 : sugyan
• ( )

3. Web API
• API = Application Programming Interface
– /
• Web API
API

4. Web API
• Twitter API
• Google Ajax API
• YouTube API
• Flickr API
• mixi API
• API
• etc…

5. /
• Web
– HTTP
– URI
– GET/POST
– JSON/XML etc.

6. 3 (GET )
1. URI
2. GET
3.

7. • Twitter perl
– http://search.twitter.com/search.json?q=perl
• GET
• JSON
•

8. Twitter Search API
• Twitter
• http://dev.twitter.com/doc/get/search
•

9. API
• URI
– http://search.twitter.com/search.json
•
– JSON/atom
•
– GET
•
– q=perl

10. Web

11. URI
• ASCII
• URI
• http://search.twitter.com/search.json?q=
%E3%81%8A%E3%81%AF
%E3%82%88%E3%81%86

12. URI
use URI;
use utf8;
my $query = ' ';
my $uri =
URI‐>new('http://search.twitter.com/search.json');
my $params = {
q => $query,
result_type => 'popular',
};
$uri‐>query_form(%$params);
print "$urin";
http://search.twitter.com/search.json?
result_type=popular&q=%E3%81%8A%E3%81%AF
%E3%82%88%E3%81%86

13. Web API
• LWP::UserAgent
– Others: LWP::Simple, URI::Fetch
• HTTP::Request
•
– GET/POST/PUT/DELETE/HEAD
• HTTP::Response

14. LWP::UserAgent
use URI;
use LWP::UserAgent;
my $uri = URI‐>new('http://search.twitter.com/
search.json?q=perl');
my $ua = LWP::UserAgent‐>new();
my $res = $ua‐>get( $uri );
die $res‐>status_line if $res‐>is_error;
print $res‐>content . "n";

15. • cpanm JSON -> JSON::XS or JSON::PP
• JSON
– uXXXX Unicode ascii
–
– u304au306fu3088u3046

16. JSON
use JSON qw( decode_json );
use Encode qw( encode_utf8 );
my $json_text =
'{"user":"yusukebe","message":"u304au306fu3088u3046"}';
my $ref = decode_json($json_text);
print encode_utf8("$ref‐>{user} : $ref‐>{message}n");
yusukebe :

17. • URI URI
• LWP::UserAgent URI
/
• JSON

18. • #yokohamapm
use LWP::UserAgent;
use URI;
use JSON qw(decode_json);
use Encode qw(encode_utf8);
my $query = '#yokohamapm';
my $uri = URI‐>new('http://search.twitter.com/search.json');

19. my $params = {
q => $query,
result_type => 'recent',
};
$uri‐>query_form(%$params);
my $ua = LWP::UserAgent‐>new;
my $res = $ua‐>get($uri);
die "Error: ". $res‐>status_line if $res‐>is_error;
my $json = $res‐>content;
my $ref = decode_json($json);
for my $tweet ( @{ $ref‐>{results} } ) {
print encode_utf8("@$tweet‐>{from_user}: $tweet‐>{text}n");
}

20. $ perl twitter_search.pl
@mazkeng: ust #yokohamapm
@hokke_mirin: 2 #perlcasual
#yokohamapm
@yusukebe: #yokohamapm

21. WebService::Simple
use WebService::Simple;
use Data::Dumper;
my $query = '#yokohamapm';
my $service = WebService::Simple‐>new(
base_url => 'http://search.twitter.com/search.json',
response_parser => 'JSON',
);
my $res = $service‐>get( { q => $query });
my $ref = $res‐>parse_response();
print Dumper $ref;

22. • Web API =
• Standing on the shoulders of giants -
-

23. ?
WEB+DB PRESS vol.58
2010 8
Perl Hackers Hub