PerlでWeb API入門

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

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

Web API
•  API = Application Programming Interface
–  /

•  Web API
API

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

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

3 (GET )
1.  URI
2.  GET
3.

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

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

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

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

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

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

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";

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

– 
–  u304au306fu3088u3046

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 :

•  URI URI
•  LWP::UserAgent URI
/
•  JSON

•  #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');

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");
}

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

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;

•  Web API =

•  Standing on the shoulders of giants -

-

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

PerlでWeb API入門

PerlでWeb API入門

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