8 |
use Carp qw/verbose/; |
use Carp qw/verbose/; |
9 |
use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1; |
use Module::Pluggable search_path => 'Grep::Source', sub_name => 'sources', require => 1; |
10 |
use base qw(Class::Accessor Jifty::Object); |
use base qw(Class::Accessor Jifty::Object); |
11 |
Grep::Source->mk_accessors( qw(feed uri q new_items collection) ); |
Grep::Source->mk_accessors( qw(feed uri q new_items collection search_obj tree) ); |
12 |
|
|
13 |
use HTML::TreeBuilder; |
use HTML::TreeBuilder; |
14 |
use WWW::Mechanize; |
use WWW::Mechanize; |
108 |
my $class = $self->feed->source || 'Grep::Source::Feed'; |
my $class = $self->feed->source || 'Grep::Source::Feed'; |
109 |
$self->log->debug("using $class"); |
$self->log->debug("using $class"); |
110 |
|
|
111 |
my $parent = $self; |
$self->search_obj( Grep::Search->new() ); |
112 |
$class->fetch( $parent ); |
$self->log->debug("created " . $self->search_obj); |
|
undef $parent; |
|
113 |
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|
114 |
Grep::Search->finish if $self->new_items; |
$class->fetch( $self ); |
115 |
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|
116 |
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$self->search_obj->finish; |
117 |
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|
118 |
return $self->collection; |
return $self->collection; |
119 |
} |
} |
132 |
sub add_record { |
sub add_record { |
133 |
my $self = shift; |
my $self = shift; |
134 |
|
|
135 |
|
$self->log->confess("no search_obj") unless ($self->search_obj); |
136 |
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|
137 |
my $i = Grep::Model::Item->new(); |
my $i = Grep::Model::Item->new(); |
138 |
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|
139 |
my $rec = {@_}; |
my $rec = {@_}; |
140 |
|
|
141 |
warn "resolving links"; |
$self->log->debug("resolving links using base ", $rec->{link}); |
142 |
my $resolver = HTML::ResolveLink->new( base => $rec->{link} ); |
my $resolver = HTML::ResolveLink->new( base => $rec->{link} ); |
143 |
$rec->{content} = $resolver->resolve( $rec->{content} ); |
$rec->{content} = $resolver->resolve( $rec->{content} ); |
144 |
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|
152 |
|
|
153 |
# is new record? |
# is new record? |
154 |
if ( $msg !~ m/^Found/ ) { |
if ( $msg !~ m/^Found/ ) { |
155 |
Grep::Search->add( $i ); |
$self->search_obj->add( $i ); |
156 |
$self->new_items( ( $self->new_items || 0 ) + 1 ); |
$self->new_items( ( $self->new_items || 0 ) + 1 ); |
157 |
} |
} |
158 |
} else { |
} else { |
188 |
} |
} |
189 |
} |
} |
190 |
|
|
191 |
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|
192 |
|
=head2 element_by_triplet |
193 |
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194 |
|
Helper method to select element(s) using C<element/attribute/value> triplet using |
195 |
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L<HTML::TreeBuilder> trees. |
196 |
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|
197 |
|
my $el = $self->element_by_triplet( |
198 |
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tree => $tree_or_element, |
199 |
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triplets => [ qw/ |
200 |
|
div id target |
201 |
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div class another |
202 |
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/ ], |
203 |
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message => 'find search result element', |
204 |
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fatal => 1, # die instead of warn |
205 |
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); |
206 |
|
|
207 |
|
=cut |
208 |
|
|
209 |
|
sub element_by_triplet { |
210 |
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my $self = shift; |
211 |
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|
212 |
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my $args = {@_}; |
213 |
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|
214 |
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my $tree = $args->{tree} || die "no tree"; |
215 |
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my $message = $args->{message} || ''; |
216 |
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my $fatal = $args->{fatal}; |
217 |
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die "no triplets" unless defined( $args->{triplets} ); |
218 |
|
my @triplets; |
219 |
|
if ( ref( $args->{triplets} ) eq 'ARRAY' ) { |
220 |
|
@triplets = @{ $args->{triplets} }; |
221 |
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} else { |
222 |
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@triplets = ( $args->{triplets} ); |
223 |
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} |
224 |
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|
225 |
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push @triplets, ( undef, undef ) if ( $#triplets == 0 ); |
226 |
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|
227 |
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die "triplet doesn't have 3 elements but ", $#triplets unless ( |
228 |
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( $#triplets + 1 ) % 3 == 0 |
229 |
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); |
230 |
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|
231 |
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my ( $el, $attr, $value ); |
232 |
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233 |
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my @results; |
234 |
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my @tags; |
235 |
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236 |
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warn "triplets = ",dump( @triplets ); |
237 |
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|
238 |
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while ( @triplets ) { |
239 |
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( $el,$attr,$value ) = splice( @triplets, 0, 3 ); |
240 |
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my $tag = $attr ? "<$el $attr=\"$value\">" : "<$el>"; |
241 |
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push @tags, $tag; |
242 |
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$self->log->debug("looking for $message $tag"); |
243 |
|
@results = $tree->look_down( '_tag', $el, sub { |
244 |
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return 1 unless ( $attr && $value ); |
245 |
|
( $_[0]->attr( $attr ) || '' ) eq $value; |
246 |
|
}); |
247 |
|
last if @results; |
248 |
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} |
249 |
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|
250 |
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if ( ! @results ) { |
251 |
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my $msg = "can't find $message ", join(" ", @tags); |
252 |
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die $msg if ( $fatal ); |
253 |
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warn $msg; |
254 |
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return; |
255 |
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} |
256 |
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|
257 |
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$self->log->debug("found ", $#results + 1, " results"); |
258 |
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259 |
|
#warn dump( map { $_->as_HTML } @results ); |
260 |
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261 |
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return @results if wantarray; |
262 |
|
return shift @results; |
263 |
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} |
264 |
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|
265 |
=head2 scrape |
=head2 scrape |
266 |
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|
267 |
Create semi-complex L<WWW::Mechanize> rules to scrape page |
Create semi-complex L<WWW::Mechanize> rules to scrape page easily |
268 |
|
|
269 |
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$parent->scrape( |
270 |
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# if search string isn't part or URI |
271 |
|
submit_form => { |
272 |
|
fields => { |
273 |
|
value => $parent->q, |
274 |
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}, |
275 |
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button => 'fullsearch', |
276 |
|
}, |
277 |
|
# element with search results |
278 |
|
wrapper => [ qw/div class searchresults/ ], |
279 |
|
# element (or tripple) for each result with link |
280 |
|
# <a href=".."> inside it to full-text result |
281 |
|
results => 'dt', |
282 |
|
# collect which element on page linked from results |
283 |
|
scrape => [ qw/div id page/ ], |
284 |
|
# when search returns just single hit, it will redirect to result page |
285 |
|
redirect_single_result => 1, |
286 |
|
); |
287 |
|
|
288 |
=cut |
=cut |
289 |
|
|
292 |
|
|
293 |
my $args = {@_}; |
my $args = {@_}; |
294 |
|
|
295 |
warn "scrape got args ",dump($args); |
$self->log->debug("scrape with args ",dump($args)); |
296 |
|
|
297 |
my ($feed,$uri,$q) = ($self->feed, $self->uri,$self->q); |
my ($feed,$uri,$q) = ($self->feed, $self->uri,$self->q); |
298 |
die "no uri" unless ($uri); |
die "no uri" unless ($uri); |
314 |
$self->save( 'get.html', $mech->content ); |
$self->save( 'get.html', $mech->content ); |
315 |
|
|
316 |
if ( my $form = $args->{submit_form} ) { |
if ( my $form = $args->{submit_form} ) { |
317 |
warn "submit form on $uri with ", dump( $form ),"\n"; |
$self->log->debug("submit form on $uri with ", dump( $form )); |
318 |
$mech->submit_form( %$form ) or die "can't submit form ", dump( $form ); |
$mech->submit_form( %$form ) or die "can't submit form ", dump( $form ); |
319 |
$self->save( 'submit.html', $mech->content ); |
$self->save( 'submit.html', $mech->content ); |
320 |
} |
} |
321 |
|
|
322 |
warn "parse result page\n"; |
$self->log->debug("parse result page"); |
323 |
|
|
324 |
my $tree = HTML::TreeBuilder->new or die "can't create html tree"; |
my $tree = HTML::TreeBuilder->new or die "can't create html tree"; |
325 |
$tree->parse( $mech->content ) or die "can't parse fetched content"; |
$tree->parse( $mech->content ) or die "can't parse fetched content"; |
326 |
|
|
327 |
die "wrapper doesn't have 3 elements but ", $#{ $args->{wrapper} } unless ( $#{ $args->{wrapper} } == 2 ); |
my @wrapper_divs = $self->element_by_triplet( |
328 |
my ( $el,$attr,$value ) = @{ $args->{wrapper} }; |
tree => $tree, |
329 |
|
triplets => $args->{wrapper}, |
330 |
|
message => 'wrapper for all results', |
331 |
|
fatal => $args->{redirect_single_result} ? 0 : 1, |
332 |
|
); |
333 |
|
|
334 |
|
my $max = 15; |
335 |
|
my $nr = 1; |
336 |
|
|
337 |
|
my $base_uri = $uri; |
338 |
|
$base_uri =~ s!\?.*$!!; |
339 |
|
|
340 |
|
# directly got first result |
341 |
|
if ( $args->{redirect_single_result} && ! @wrapper_divs ) { |
342 |
|
|
343 |
warn "looking for <$el $attr=\"$value\">"; |
my $uri = $mech->uri; $uri->query( undef ); $uri = $uri->canonical; |
344 |
|
|
345 |
my $div = $tree->look_down( '_tag', $el, sub { |
my $div = $self->element_by_triplet( |
346 |
warn dump( $_[0]->attr( $attr ) ),$/; |
tree => $tree, |
347 |
( $_[0]->attr( $attr ) || '' ) eq $value; |
message => "single result - redirect to $uri", |
348 |
}); |
triplets => $args->{scrape}, |
349 |
|
fatal => 1, |
350 |
|
); |
351 |
|
|
352 |
|
$self->add_record( |
353 |
|
in_feed => $feed, |
354 |
|
title => $mech->title, |
355 |
|
link => $uri, |
356 |
|
content => $div->as_HTML, |
357 |
|
); |
358 |
|
|
359 |
if ( ! $div ) { |
$tree->delete; # clear memory! |
|
warn "can't find results wrapper <$el $attr=\"$value\">"; |
|
360 |
return; |
return; |
361 |
} |
} |
362 |
|
|
363 |
my $max = 5; |
my @r; |
|
my $nr = 1; |
|
364 |
|
|
365 |
my $base_uri = $uri; |
foreach my $div ( @wrapper_divs ) { |
366 |
$base_uri =~ s!\?.*$!!; |
|
367 |
|
my @r_here = $self->element_by_triplet( |
368 |
|
tree => $div, |
369 |
|
triplets => $args->{results}, |
370 |
|
message => 'result element', |
371 |
|
); |
372 |
|
|
373 |
|
push @r, @r_here if (@r_here); |
374 |
|
} |
375 |
|
|
376 |
foreach my $dt ( $div->look_down( '_tag', $args->{results} ) ) { |
$self->log->debug("in total, found ", $#r + 1, " results in ", $#wrapper_divs + 1, " result wrapper elements"); |
377 |
|
|
378 |
|
foreach my $dt ( @r ) { |
379 |
my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } ); |
my $a = $dt->look_down( '_tag', 'a', sub { $_[0]->attr('href') } ); |
380 |
if ( $a ) { |
if ( $a ) { |
381 |
|
|
382 |
my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">"; |
my $href = $a->attr('href') or die "can't find href inside <", $args->{results}, ">"; |
383 |
my $page_uri = URI->new_abs( $a->attr('href'), $base_uri ); |
|
384 |
|
my $page_uri = URI->new_abs( $href, $base_uri ); |
385 |
$page_uri->query( undef ); |
$page_uri->query( undef ); |
386 |
$page_uri = $page_uri->canonical; |
$page_uri = $page_uri->canonical; |
387 |
|
|
388 |
warn "fetching page: ",$a->as_text," from $page_uri\n"; |
$self->log->debug("fetching page: ",$a->as_text," from $page_uri"); |
389 |
if ( $mech->follow_link( url => $a->attr('href') ) ) { |
if ( $mech->follow_link( url => $href ) ) { |
390 |
|
|
391 |
$self->save( "page-${nr}.html", $mech->content ); |
$self->save( "page-${nr}.html", $mech->content ); |
392 |
|
|
393 |
my $page_tree = HTML::TreeBuilder->new or die "can't create page tree"; |
my $page_tree = HTML::TreeBuilder->new or die "can't create page tree"; |
394 |
$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri"; |
$page_tree->parse( $mech->content ) or die "can't parse page at $page_uri"; |
395 |
|
my $div = $self->element_by_triplet( |
396 |
( $el,$attr,$value ) = @{ $args->{scrape} }; |
tree => $page_tree, |
397 |
$div = $page_tree->look_down( '_tag', $el, sub { ( $_[0]->attr( $attr ) || '' ) eq $value } ); |
message => "result page $nr", |
398 |
|
triplets => $args->{scrape} |
399 |
die "can't find <$el $attr=\"$value\">" unless ($div); |
); |
400 |
|
|
401 |
$self->add_record( |
$self->add_record( |
402 |
in_feed => $feed, |
in_feed => $feed, |
408 |
# author => |
# author => |
409 |
# issued => |
# issued => |
410 |
# modified => |
# modified => |
411 |
); |
) if ( $div ); |
412 |
|
|
413 |
$mech->back; |
$mech->back; |
414 |
$page_tree->delete; |
$page_tree->delete; |
416 |
} else { |
} else { |
417 |
warn "can't follow uri $page_uri: $!\n"; |
warn "can't follow uri $page_uri: $!\n"; |
418 |
} |
} |
419 |
|
} else { |
420 |
|
$self->log->debug("result $nr doesn't have link inside, ignoring..."); |
421 |
} |
} |
422 |
|
|
423 |
last if ($nr == $max); |
last if ($nr == $max); |