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#! /usr/bin/env perl
use warnings;
use strict;
use File::Path;
use LWP::UserAgent;
use HTML::LinkExtor;
use URI;
use URI::URL;
use URI::Escape;
# This script downloads MS Office files for you. You should provide a search
# term which is used to get a list of document.
# To download 20 presentations about pears do:
# downloadMSOfficeDocuments.pl 20 pear ppt
#
# Copyright 2009 Jos van den Oever <jos@vandenoever.info>
if ($#ARGV != 2 || $ARGV[0] !~ m/^\d+$/ || $ARGV[1] !~ m/^\w+$/) {
die "Usage: $0 number term type\n";
}
my $maxresults = $ARGV[0];
my $term = $ARGV[1];
my $type = $ARGV[2];
my $maxjobs = 10;
my %mimetypes = (
"ppt", "application/vnd.ms-powerpoint",
"pdf", "application/pdf",
"pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation" ,
"xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
"docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
"doc", "application/msword",
"xls", "application/vnd.ms-excel",
"rtf", "application/rtf",
"ods", "application/vnd.oasis.opendocument.spreadsheet",
"odt", "application/vnd.oasis.opendocument.text",
"odp", "application/vnd.oasis.opendocument.presentation"
);
if (!defined $mimetypes{$type}) {
die "Unknown type '$type'.\n";
}
my $mimetype = $mimetypes{$type};
#used to dispatch web requests
my $ua = LWP::UserAgent->new;
$ua->timeout(10); # seconds
$ua->env_proxy;
my $agentstring = 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)';
$ua->agent($agentstring);
my @pages;
sub callback {
my($tag, %attr) = @_;
# we only look closer at <a ...>
return if $tag ne 'a';
push(@pages, values %attr);
}
#extracts links from an HTML document
my $p = HTML::LinkExtor->new(\&callback);
my $runningjobs = 0;
sub startJob {
#Shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down.
my $uri = shift;
if ($runningjobs >= $maxjobs) {
wait;
$runningjobs--;
}
$runningjobs++;
if (!fork()) {
my $localuri = $uri;
my $localua = LWP::UserAgent->new;
$localua->timeout(10); # seconds
$localua->env_proxy;
$localua->agent($agentstring);
my $res = $localua->request(HTTP::Request->new(HEAD => $localuri));
if ($res->content_type() eq $mimetype) {
my $filename = uri_unescape($localuri);
$filename =~ s#^http://##;
$filename = uri_escape($filename, '/:\!&*$?;:= \'"');
print $localuri."\n";
$ua->get($localuri, ':content_file' => $filename);
}
exit;
}
}
my @jobs;
my %done;
sub addJob {
#Shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down.
my $uri = shift;
my $scheme = $uri->scheme;
if (exists $done{$uri} || ($scheme ne "http" && $scheme ne "https")) {
return;
}
$done{$uri} = 1;
push @jobs, $uri;
while (@jobs && $runningjobs < $maxjobs) {
startJob(pop @jobs);
#sleep 1;
}
}
for (my $start=0; $start < $maxresults; $start = $start + 100) {
if ($start > 0) {
sleep 3; # do not query search engine too often
}
@pages = ();
my $base = "http://www.google.com/";
my $url = $base . "search?q=$term+filetype:$type&start=$start&num=100";
my $res = $ua->request(HTTP::Request->new(GET => $url), sub {$p->parse($_[0])});
foreach (@pages) {
my $uri = URI->new_abs($_, $base);
if ($uri->host =~ m/google/) {
my @q = $uri->query_form;
if (!@q) {
next;
}
for (my $i = 0; $i <= @q; $i++) {
$uri = URI->new_abs($q[$i], $base);
if (($uri->scheme eq "http" ||
$uri->scheme eq "https") &&
$uri->host !~ m/google/) {
addJob($uri);
}
}
} else {
addJob($uri);
}
}
}
# keep the queue filled
while (@jobs) {
startJob(pop @jobs);
}
# wait for jobs to finish
my $pid;
do {
$pid = wait;
} while ($pid != -1);
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