Commit | Line | Data |
79fd8837 |
1 | package File::Fetch; |
2 | |
3 | use strict; |
4 | use FileHandle; |
6e654618 |
5 | use File::Temp; |
79fd8837 |
6 | use File::Copy; |
7 | use File::Spec; |
8 | use File::Spec::Unix; |
79fd8837 |
9 | use File::Basename qw[dirname]; |
10 | |
11 | use Cwd qw[cwd]; |
12 | use Carp qw[carp]; |
13 | use IPC::Cmd qw[can_run run]; |
14 | use File::Path qw[mkpath]; |
15 | use Params::Check qw[check]; |
16 | use Module::Load::Conditional qw[can_load]; |
17 | use Locale::Maketext::Simple Style => 'gettext'; |
18 | |
19 | use vars qw[ $VERBOSE $PREFER_BIN $FROM_EMAIL $USER_AGENT |
20 | $BLACKLIST $METHOD_FAIL $VERSION $METHODS |
21 | $FTP_PASSIVE $TIMEOUT $DEBUG $WARN |
22 | ]; |
23 | |
d4b3706f |
24 | use constant QUOTE => do { $^O eq 'MSWin32' ? q["] : q['] }; |
25 | |
26 | |
6e654618 |
27 | $VERSION = '0.16'; |
fe98d82b |
28 | $VERSION = eval $VERSION; # avoid warnings with development releases |
29 | $PREFER_BIN = 0; # XXX TODO implement |
79fd8837 |
30 | $FROM_EMAIL = 'File-Fetch@example.com'; |
31 | $USER_AGENT = 'File::Fetch/$VERSION'; |
32 | $BLACKLIST = [qw|ftp|]; |
33 | $METHOD_FAIL = { }; |
34 | $FTP_PASSIVE = 1; |
35 | $TIMEOUT = 0; |
36 | $DEBUG = 0; |
37 | $WARN = 1; |
38 | |
39 | ### methods available to fetch the file depending on the scheme |
40 | $METHODS = { |
6e654618 |
41 | http => [ qw|lwp wget curl lftp lynx| ], |
42 | ftp => [ qw|lwp netftp wget curl lftp ncftp ftp| ], |
43 | file => [ qw|lwp lftp file| ], |
79fd8837 |
44 | rsync => [ qw|rsync| ] |
45 | }; |
46 | |
47 | ### silly warnings ### |
48 | local $Params::Check::VERBOSE = 1; |
49 | local $Params::Check::VERBOSE = 1; |
50 | local $Module::Load::Conditional::VERBOSE = 0; |
51 | local $Module::Load::Conditional::VERBOSE = 0; |
52 | |
53 | ### see what OS we are on, important for file:// uris ### |
9e5ea595 |
54 | use constant ON_WIN => ($^O eq 'MSWin32'); |
55 | use constant ON_VMS => ($^O eq 'VMS'); |
1f80753b |
56 | use constant ON_UNIX => (!ON_WIN); |
57 | use constant HAS_VOL => (ON_WIN); |
fe98d82b |
58 | use constant HAS_SHARE => (ON_WIN); |
79fd8837 |
59 | =pod |
60 | |
61 | =head1 NAME |
62 | |
63 | File::Fetch - A generic file fetching mechanism |
64 | |
65 | =head1 SYNOPSIS |
66 | |
67 | use File::Fetch; |
68 | |
69 | ### build a File::Fetch object ### |
70 | my $ff = File::Fetch->new(uri => 'http://some.where.com/dir/a.txt'); |
71 | |
72 | ### fetch the uri to cwd() ### |
73 | my $where = $ff->fetch() or die $ff->error; |
74 | |
75 | ### fetch the uri to /tmp ### |
76 | my $where = $ff->fetch( to => '/tmp' ); |
77 | |
78 | ### parsed bits from the uri ### |
79 | $ff->uri; |
80 | $ff->scheme; |
81 | $ff->host; |
82 | $ff->path; |
83 | $ff->file; |
84 | |
85 | =head1 DESCRIPTION |
86 | |
87 | File::Fetch is a generic file fetching mechanism. |
88 | |
89 | It allows you to fetch any file pointed to by a C<ftp>, C<http>, |
90 | C<file>, or C<rsync> uri by a number of different means. |
91 | |
92 | See the C<HOW IT WORKS> section further down for details. |
93 | |
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94 | =head1 ACCESSORS |
95 | |
96 | A C<File::Fetch> object has the following accessors |
97 | |
98 | =over 4 |
99 | |
100 | =item $ff->uri |
101 | |
102 | The uri you passed to the constructor |
103 | |
104 | =item $ff->scheme |
105 | |
106 | The scheme from the uri (like 'file', 'http', etc) |
107 | |
108 | =item $ff->host |
109 | |
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110 | The hostname in the uri. Will be empty if host was originally |
111 | 'localhost' for a 'file://' url. |
112 | |
113 | =item $ff->vol |
114 | |
115 | On operating systems with the concept of a volume the second element |
116 | of a file:// is considered to the be volume specification for the file. |
1f80753b |
117 | Thus on Win32 this routine returns the volume, on other operating |
118 | systems this returns nothing. |
fe98d82b |
119 | |
120 | On Windows this value may be empty if the uri is to a network share, in |
121 | which case the 'share' property will be defined. Additionally, volume |
122 | specifications that use '|' as ':' will be converted on read to use ':'. |
123 | |
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124 | On VMS, which has a volume concept, this field will be empty because VMS |
125 | file specifications are converted to absolute UNIX format and the volume |
126 | information is transparently included. |
127 | |
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128 | =item $ff->share |
129 | |
130 | On systems with the concept of a network share (currently only Windows) returns |
131 | the sharename from a file://// url. On other operating systems returns empty. |
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132 | |
133 | =item $ff->path |
134 | |
135 | The path from the uri, will be at least a single '/'. |
136 | |
137 | =item $ff->file |
138 | |
139 | The name of the remote file. For the local file name, the |
140 | result of $ff->output_file will be used. |
141 | |
142 | =cut |
143 | |
144 | |
145 | ########################## |
146 | ### Object & Accessors ### |
147 | ########################## |
148 | |
149 | { |
150 | ### template for new() and autogenerated accessors ### |
151 | my $Tmpl = { |
152 | scheme => { default => 'http' }, |
153 | host => { default => 'localhost' }, |
154 | path => { default => '/' }, |
155 | file => { required => 1 }, |
156 | uri => { required => 1 }, |
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157 | vol => { default => '' }, # windows for file:// uris |
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158 | share => { default => '' }, # windows for file:// uris |
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159 | _error_msg => { no_override => 1 }, |
160 | _error_msg_long => { no_override => 1 }, |
161 | }; |
162 | |
163 | for my $method ( keys %$Tmpl ) { |
164 | no strict 'refs'; |
165 | *$method = sub { |
166 | my $self = shift; |
167 | $self->{$method} = $_[0] if @_; |
168 | return $self->{$method}; |
169 | } |
170 | } |
171 | |
172 | sub _create { |
173 | my $class = shift; |
174 | my %hash = @_; |
175 | |
176 | my $args = check( $Tmpl, \%hash ) or return; |
177 | |
178 | bless $args, $class; |
179 | |
180 | if( lc($args->scheme) ne 'file' and not $args->host ) { |
181 | return File::Fetch->_error(loc( |
182 | "Hostname required when fetching from '%1'",$args->scheme)); |
183 | } |
184 | |
185 | for (qw[path file]) { |
9e5ea595 |
186 | unless( $args->$_() ) { # 5.5.x needs the () |
d4b3706f |
187 | return File::Fetch->_error(loc("No '%1' specified",$_)); |
188 | } |
189 | } |
190 | |
191 | return $args; |
192 | } |
193 | } |
194 | |
195 | =item $ff->output_file |
196 | |
197 | The name of the output file. This is the same as $ff->file, |
198 | but any query parameters are stripped off. For example: |
199 | |
200 | http://example.com/index.html?x=y |
201 | |
202 | would make the output file be C<index.html> rather than |
203 | C<index.html?x=y>. |
204 | |
205 | =back |
206 | |
207 | =cut |
208 | |
209 | sub output_file { |
210 | my $self = shift; |
211 | my $file = $self->file; |
212 | |
213 | $file =~ s/\?.*$//g; |
214 | |
215 | return $file; |
216 | } |
217 | |
218 | ### XXX do this or just point to URI::Escape? |
219 | # =head2 $esc_uri = $ff->escaped_uri |
220 | # |
221 | # =cut |
222 | # |
223 | # ### most of this is stolen straight from URI::escape |
224 | # { ### Build a char->hex map |
225 | # my %escapes = map { chr($_) => sprintf("%%%02X", $_) } 0..255; |
226 | # |
227 | # sub escaped_uri { |
228 | # my $self = shift; |
229 | # my $uri = $self->uri; |
230 | # |
231 | # ### Default unsafe characters. RFC 2732 ^(uric - reserved) |
232 | # $uri =~ s/([^A-Za-z0-9\-_.!~*'()])/ |
233 | # $escapes{$1} || $self->_fail_hi($1)/ge; |
234 | # |
235 | # return $uri; |
236 | # } |
237 | # |
238 | # sub _fail_hi { |
239 | # my $self = shift; |
240 | # my $char = shift; |
241 | # |
242 | # $self->_error(loc( |
243 | # "Can't escape '%1', try using the '%2' module instead", |
244 | # sprintf("\\x{%04X}", ord($char)), 'URI::Escape' |
245 | # )); |
246 | # } |
247 | # |
248 | # sub output_file { |
249 | # |
250 | # } |
251 | # |
252 | # |
253 | # } |
254 | |
79fd8837 |
255 | =head1 METHODS |
256 | |
257 | =head2 $ff = File::Fetch->new( uri => 'http://some.where.com/dir/file.txt' ); |
258 | |
259 | Parses the uri and creates a corresponding File::Fetch::Item object, |
260 | that is ready to be C<fetch>ed and returns it. |
261 | |
262 | Returns false on failure. |
263 | |
264 | =cut |
265 | |
266 | sub new { |
267 | my $class = shift; |
268 | my %hash = @_; |
269 | |
270 | my ($uri); |
271 | my $tmpl = { |
272 | uri => { required => 1, store => \$uri }, |
273 | }; |
274 | |
275 | check( $tmpl, \%hash ) or return; |
276 | |
277 | ### parse the uri to usable parts ### |
278 | my $href = __PACKAGE__->_parse_uri( $uri ) or return; |
279 | |
280 | ### make it into a FFI object ### |
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281 | my $ff = File::Fetch->_create( %$href ) or return; |
79fd8837 |
282 | |
283 | |
284 | ### return the object ### |
d4b3706f |
285 | return $ff; |
79fd8837 |
286 | } |
287 | |
288 | ### parses an uri to a hash structure: |
289 | ### |
290 | ### $class->_parse_uri( 'ftp://ftp.cpan.org/pub/mirror/index.txt' ) |
291 | ### |
292 | ### becomes: |
293 | ### |
294 | ### $href = { |
295 | ### scheme => 'ftp', |
296 | ### host => 'ftp.cpan.org', |
297 | ### path => '/pub/mirror', |
298 | ### file => 'index.html' |
299 | ### }; |
300 | ### |
9e5ea595 |
301 | ### In the case of file:// urls there maybe be additional fields |
302 | ### |
5e6d05d2 |
303 | ### For systems with volume specifications such as Win32 there will be |
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304 | ### a volume specifier provided in the 'vol' field. |
305 | ### |
306 | ### 'vol' => 'volumename' |
307 | ### |
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308 | ### For windows file shares there may be a 'share' key specified |
309 | ### |
310 | ### 'share' => 'sharename' |
311 | ### |
fe98d82b |
312 | ### Note that the rules of what a file:// url means vary by the operating system |
313 | ### of the host being addressed. Thus file:///d|/foo/bar.txt means the obvious |
314 | ### 'D:\foo\bar.txt' on windows, but on unix it means '/d|/foo/bar.txt' and |
315 | ### not '/foo/bar.txt' |
9e5ea595 |
316 | ### |
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317 | ### Similarly if the host interpreting the url is VMS then |
318 | ### file:///disk$user/my/notes/note12345.txt' means |
1f80753b |
319 | ### 'DISK$USER:[MY.NOTES]NOTE123456.TXT' but will be returned the same as |
320 | ### if it is unix where it means /disk$user/my/notes/note12345.txt'. |
321 | ### Except for some cases in the File::Spec methods, Perl on VMS will generally |
322 | ### handle UNIX format file specifications. |
fe98d82b |
323 | ### |
324 | ### This means it is impossible to serve certain file:// urls on certain systems. |
325 | ### |
326 | ### Thus are the problems with a protocol-less specification. :-( |
9e5ea595 |
327 | ### |
328 | |
79fd8837 |
329 | sub _parse_uri { |
330 | my $self = shift; |
331 | my $uri = shift or return; |
332 | |
333 | my $href = { uri => $uri }; |
334 | |
335 | ### find the scheme ### |
336 | $uri =~ s|^(\w+)://||; |
337 | $href->{scheme} = $1; |
338 | |
9e5ea595 |
339 | ### See rfc 1738 section 3.10 |
340 | ### http://www.faqs.org/rfcs/rfc1738.html |
341 | ### And wikipedia for more on windows file:// urls |
342 | ### http://en.wikipedia.org/wiki/File:// |
79fd8837 |
343 | if( $href->{scheme} eq 'file' ) { |
9e5ea595 |
344 | |
345 | my @parts = split '/',$uri; |
346 | |
347 | ### file://hostname/... |
348 | ### file://hostname/... |
fe98d82b |
349 | ### normalize file://localhost with file:/// |
9e5ea595 |
350 | $href->{host} = $parts[0] || ''; |
351 | |
352 | ### index in @parts where the path components begin; |
353 | my $index = 1; |
9e5ea595 |
354 | |
355 | ### file:////hostname/sharename/blah.txt |
fe98d82b |
356 | if ( HAS_SHARE and not length $parts[0] and not length $parts[1] ) { |
357 | |
9e5ea595 |
358 | $href->{host} = $parts[2] || ''; # avoid warnings |
359 | $href->{share} = $parts[3] || ''; # avoid warnings |
360 | |
361 | $index = 4 # index after the share |
9e5ea595 |
362 | |
fe98d82b |
363 | ### file:///D|/blah.txt |
364 | ### file:///D:/blah.txt |
fe98d82b |
365 | } elsif (HAS_VOL) { |
366 | |
367 | ### this code comes from dmq's patch, but: |
368 | ### XXX if volume is empty, wouldn't that be an error? --kane |
369 | ### if so, our file://localhost test needs to be fixed as wel |
370 | $href->{vol} = $parts[1] || ''; |
371 | |
372 | ### correct D| style colume descriptors |
373 | $href->{vol} =~ s/\A([A-Z])\|\z/$1:/i if ON_WIN; |
374 | |
375 | $index = 2; # index after the volume |
376 | } |
377 | |
378 | ### rebuild the path from the leftover parts; |
9e5ea595 |
379 | $href->{path} = join '/', '', splice( @parts, $index, $#parts ); |
79fd8837 |
380 | |
381 | } else { |
9e5ea595 |
382 | ### using anything but qw() in hash slices may produce warnings |
383 | ### in older perls :-( |
384 | @{$href}{ qw(host path) } = $uri =~ m|([^/]*)(/.*)$|s; |
79fd8837 |
385 | } |
386 | |
387 | ### split the path into file + dir ### |
388 | { my @parts = File::Spec::Unix->splitpath( delete $href->{path} ); |
389 | $href->{path} = $parts[1]; |
390 | $href->{file} = $parts[2]; |
391 | } |
392 | |
fe98d82b |
393 | ### host will be empty if the target was 'localhost' and the |
394 | ### scheme was 'file' |
395 | $href->{host} = '' if ($href->{host} eq 'localhost') and |
396 | ($href->{scheme} eq 'file'); |
79fd8837 |
397 | |
398 | return $href; |
399 | } |
400 | |
401 | =head2 $ff->fetch( [to => /my/output/dir/] ) |
402 | |
403 | Fetches the file you requested. By default it writes to C<cwd()>, |
404 | but you can override that by specifying the C<to> argument. |
405 | |
406 | Returns the full path to the downloaded file on success, and false |
407 | on failure. |
408 | |
409 | =cut |
410 | |
411 | sub fetch { |
412 | my $self = shift or return; |
413 | my %hash = @_; |
414 | |
415 | my $to; |
416 | my $tmpl = { |
417 | to => { default => cwd(), store => \$to }, |
418 | }; |
419 | |
420 | check( $tmpl, \%hash ) or return; |
421 | |
5e6d05d2 |
422 | ### On VMS force to VMS format so File::Spec will work. |
1f80753b |
423 | $to = VMS::Filespec::vmspath($to) if ON_VMS; |
424 | |
79fd8837 |
425 | ### create the path if it doesn't exist yet ### |
426 | unless( -d $to ) { |
427 | eval { mkpath( $to ) }; |
428 | |
429 | return $self->_error(loc("Could not create path '%1'",$to)) if $@; |
430 | } |
431 | |
432 | ### set passive ftp if required ### |
433 | local $ENV{FTP_PASSIVE} = $FTP_PASSIVE; |
434 | |
fe98d82b |
435 | ### we dont use catfile on win32 because if we are using a cygwin tool |
436 | ### under cmd.exe they wont understand windows style separators. |
437 | my $out_to = ON_WIN ? $to.'/'.$self->output_file |
438 | : File::Spec->catfile( $to, $self->output_file ); |
439 | |
79fd8837 |
440 | for my $method ( @{ $METHODS->{$self->scheme} } ) { |
441 | my $sub = '_'.$method.'_fetch'; |
442 | |
443 | unless( __PACKAGE__->can($sub) ) { |
444 | $self->_error(loc("Cannot call method for '%1' -- WEIRD!", |
445 | $method)); |
446 | next; |
447 | } |
448 | |
449 | ### method is blacklisted ### |
450 | next if grep { lc $_ eq $method } @$BLACKLIST; |
451 | |
452 | ### method is known to fail ### |
453 | next if $METHOD_FAIL->{$method}; |
454 | |
d4b3706f |
455 | ### there's serious issues with IPC::Run and quoting of command |
456 | ### line arguments. using quotes in the wrong place breaks things, |
457 | ### and in the case of say, |
458 | ### C:\cygwin\bin\wget.EXE --quiet --passive-ftp --output-document |
459 | ### "index.html" "http://www.cpan.org/index.html?q=1&y=2" |
460 | ### it doesn't matter how you quote, it always fails. |
461 | local $IPC::Cmd::USE_IPC_RUN = 0; |
462 | |
463 | if( my $file = $self->$sub( |
a0ad4830 |
464 | to => $out_to |
d4b3706f |
465 | )){ |
79fd8837 |
466 | |
467 | unless( -e $file && -s _ ) { |
468 | $self->_error(loc("'%1' said it fetched '%2', ". |
469 | "but it was not created",$method,$file)); |
470 | |
471 | ### mark the failure ### |
472 | $METHOD_FAIL->{$method} = 1; |
473 | |
474 | next; |
475 | |
476 | } else { |
477 | |
478 | my $abs = File::Spec->rel2abs( $file ); |
479 | return $abs; |
480 | } |
481 | } |
482 | } |
483 | |
484 | |
485 | ### if we got here, we looped over all methods, but we weren't able |
486 | ### to fetch it. |
487 | return; |
488 | } |
489 | |
79fd8837 |
490 | ######################## |
491 | ### _*_fetch methods ### |
492 | ######################## |
493 | |
494 | ### LWP fetching ### |
495 | sub _lwp_fetch { |
496 | my $self = shift; |
497 | my %hash = @_; |
498 | |
499 | my ($to); |
500 | my $tmpl = { |
501 | to => { required => 1, store => \$to } |
502 | }; |
503 | check( $tmpl, \%hash ) or return; |
504 | |
505 | ### modules required to download with lwp ### |
506 | my $use_list = { |
507 | LWP => '0.0', |
508 | 'LWP::UserAgent' => '0.0', |
509 | 'HTTP::Request' => '0.0', |
510 | 'HTTP::Status' => '0.0', |
511 | URI => '0.0', |
512 | |
513 | }; |
514 | |
515 | if( can_load(modules => $use_list) ) { |
516 | |
517 | ### setup the uri object |
518 | my $uri = URI->new( File::Spec::Unix->catfile( |
519 | $self->path, $self->file |
520 | ) ); |
521 | |
522 | ### special rules apply for file:// uris ### |
523 | $uri->scheme( $self->scheme ); |
524 | $uri->host( $self->scheme eq 'file' ? '' : $self->host ); |
525 | $uri->userinfo("anonymous:$FROM_EMAIL") if $self->scheme ne 'file'; |
526 | |
527 | ### set up the useragent object |
528 | my $ua = LWP::UserAgent->new(); |
529 | $ua->timeout( $TIMEOUT ) if $TIMEOUT; |
530 | $ua->agent( $USER_AGENT ); |
531 | $ua->from( $FROM_EMAIL ); |
532 | $ua->env_proxy; |
533 | |
534 | my $res = $ua->mirror($uri, $to) or return; |
535 | |
536 | ### uptodate or fetched ok ### |
537 | if ( $res->code == 304 or $res->code == 200 ) { |
538 | return $to; |
539 | |
540 | } else { |
541 | return $self->_error(loc("Fetch failed! HTTP response: %1 %2 [%3]", |
542 | $res->code, HTTP::Status::status_message($res->code), |
543 | $res->status_line)); |
544 | } |
545 | |
546 | } else { |
547 | $METHOD_FAIL->{'lwp'} = 1; |
548 | return; |
549 | } |
550 | } |
551 | |
552 | ### Net::FTP fetching |
553 | sub _netftp_fetch { |
554 | my $self = shift; |
555 | my %hash = @_; |
556 | |
557 | my ($to); |
558 | my $tmpl = { |
559 | to => { required => 1, store => \$to } |
560 | }; |
561 | check( $tmpl, \%hash ) or return; |
562 | |
563 | ### required modules ### |
564 | my $use_list = { 'Net::FTP' => 0 }; |
565 | |
566 | if( can_load( modules => $use_list ) ) { |
567 | |
568 | ### make connection ### |
569 | my $ftp; |
570 | my @options = ($self->host); |
571 | push(@options, Timeout => $TIMEOUT) if $TIMEOUT; |
572 | unless( $ftp = Net::FTP->new( @options ) ) { |
573 | return $self->_error(loc("Ftp creation failed: %1",$@)); |
574 | } |
575 | |
576 | ### login ### |
577 | unless( $ftp->login( anonymous => $FROM_EMAIL ) ) { |
578 | return $self->_error(loc("Could not login to '%1'",$self->host)); |
579 | } |
580 | |
581 | ### set binary mode, just in case ### |
582 | $ftp->binary; |
583 | |
584 | ### create the remote path |
585 | ### remember remote paths are unix paths! [#11483] |
586 | my $remote = File::Spec::Unix->catfile( $self->path, $self->file ); |
587 | |
588 | ### fetch the file ### |
589 | my $target; |
590 | unless( $target = $ftp->get( $remote, $to ) ) { |
591 | return $self->_error(loc("Could not fetch '%1' from '%2'", |
592 | $remote, $self->host)); |
593 | } |
594 | |
595 | ### log out ### |
596 | $ftp->quit; |
597 | |
598 | return $target; |
599 | |
600 | } else { |
601 | $METHOD_FAIL->{'netftp'} = 1; |
602 | return; |
603 | } |
604 | } |
605 | |
606 | ### /bin/wget fetch ### |
607 | sub _wget_fetch { |
608 | my $self = shift; |
609 | my %hash = @_; |
610 | |
611 | my ($to); |
612 | my $tmpl = { |
613 | to => { required => 1, store => \$to } |
614 | }; |
615 | check( $tmpl, \%hash ) or return; |
616 | |
617 | ### see if we have a wget binary ### |
618 | if( my $wget = can_run('wget') ) { |
619 | |
620 | ### no verboseness, thanks ### |
621 | my $cmd = [ $wget, '--quiet' ]; |
622 | |
623 | ### if a timeout is set, add it ### |
624 | push(@$cmd, '--timeout=' . $TIMEOUT) if $TIMEOUT; |
625 | |
626 | ### run passive if specified ### |
627 | push @$cmd, '--passive-ftp' if $FTP_PASSIVE; |
628 | |
629 | ### set the output document, add the uri ### |
6e654618 |
630 | push @$cmd, '--output-document', $to, $self->uri; |
631 | |
632 | ### with IPC::Cmd > 0.41, this is fixed in teh library, |
633 | ### and there's no need for special casing any more. |
634 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
635 | # $IPC::Cmd::USE_IPC_RUN |
636 | # ? ($to, $self->uri) |
637 | # : (QUOTE. $to .QUOTE, QUOTE. $self->uri .QUOTE); |
79fd8837 |
638 | |
639 | ### shell out ### |
640 | my $captured; |
d4b3706f |
641 | unless(run( command => $cmd, |
642 | buffer => \$captured, |
643 | verbose => $DEBUG |
644 | )) { |
79fd8837 |
645 | ### wget creates the output document always, even if the fetch |
646 | ### fails.. so unlink it in that case |
647 | 1 while unlink $to; |
648 | |
649 | return $self->_error(loc( "Command failed: %1", $captured || '' )); |
650 | } |
651 | |
652 | return $to; |
653 | |
654 | } else { |
655 | $METHOD_FAIL->{'wget'} = 1; |
656 | return; |
657 | } |
658 | } |
659 | |
6e654618 |
660 | ### /bin/lftp fetch ### |
661 | sub _lftp_fetch { |
662 | my $self = shift; |
663 | my %hash = @_; |
664 | |
665 | my ($to); |
666 | my $tmpl = { |
667 | to => { required => 1, store => \$to } |
668 | }; |
669 | check( $tmpl, \%hash ) or return; |
670 | |
671 | ### see if we have a wget binary ### |
672 | if( my $lftp = can_run('lftp') ) { |
673 | |
674 | ### no verboseness, thanks ### |
675 | my $cmd = [ $lftp, '-f' ]; |
676 | |
677 | my $fh = File::Temp->new; |
678 | |
679 | my $str; |
680 | |
681 | ### if a timeout is set, add it ### |
682 | $str .= "set net:timeout $TIMEOUT;\n" if $TIMEOUT; |
683 | |
684 | ### run passive if specified ### |
685 | $str .= "set ftp:passive-mode 1;\n" if $FTP_PASSIVE; |
686 | |
687 | ### set the output document, add the uri ### |
688 | ### quote the URI, because lftp supports certain shell |
689 | ### expansions, most notably & for backgrounding. |
690 | ### ' quote does nto work, must be " |
691 | $str .= q[get ']. $self->uri .q[' -o ]. $to . $/; |
692 | |
693 | if( $DEBUG ) { |
694 | my $pp_str = join ' ', split $/, $str; |
695 | print "# lftp command: $pp_str\n"; |
696 | } |
697 | |
698 | ### write straight to the file. |
699 | $fh->autoflush(1); |
700 | print $fh $str; |
701 | |
702 | ### the command needs to be 1 string to be executed |
703 | push @$cmd, $fh->filename; |
704 | |
705 | ### with IPC::Cmd > 0.41, this is fixed in teh library, |
706 | ### and there's no need for special casing any more. |
707 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
708 | # $IPC::Cmd::USE_IPC_RUN |
709 | # ? ($to, $self->uri) |
710 | # : (QUOTE. $to .QUOTE, QUOTE. $self->uri .QUOTE); |
711 | |
712 | |
713 | ### shell out ### |
714 | my $captured; |
715 | unless(run( command => $cmd, |
716 | buffer => \$captured, |
717 | verbose => $DEBUG |
718 | )) { |
719 | ### wget creates the output document always, even if the fetch |
720 | ### fails.. so unlink it in that case |
721 | 1 while unlink $to; |
722 | |
723 | return $self->_error(loc( "Command failed: %1", $captured || '' )); |
724 | } |
725 | |
726 | return $to; |
727 | |
728 | } else { |
729 | $METHOD_FAIL->{'lftp'} = 1; |
730 | return; |
731 | } |
732 | } |
733 | |
734 | |
79fd8837 |
735 | |
736 | ### /bin/ftp fetch ### |
737 | sub _ftp_fetch { |
738 | my $self = shift; |
739 | my %hash = @_; |
740 | |
741 | my ($to); |
742 | my $tmpl = { |
743 | to => { required => 1, store => \$to } |
744 | }; |
745 | check( $tmpl, \%hash ) or return; |
746 | |
d4b3706f |
747 | ### see if we have a ftp binary ### |
79fd8837 |
748 | if( my $ftp = can_run('ftp') ) { |
749 | |
750 | my $fh = FileHandle->new; |
751 | |
752 | local $SIG{CHLD} = 'IGNORE'; |
753 | |
754 | unless ($fh->open("|$ftp -n")) { |
755 | return $self->_error(loc("%1 creation failed: %2", $ftp, $!)); |
756 | } |
757 | |
758 | my @dialog = ( |
759 | "lcd " . dirname($to), |
760 | "open " . $self->host, |
761 | "user anonymous $FROM_EMAIL", |
762 | "cd /", |
763 | "cd " . $self->path, |
764 | "binary", |
d4b3706f |
765 | "get " . $self->file . " " . $self->output_file, |
79fd8837 |
766 | "quit", |
767 | ); |
768 | |
769 | foreach (@dialog) { $fh->print($_, "\n") } |
770 | $fh->close or return; |
771 | |
772 | return $to; |
773 | } |
774 | } |
775 | |
776 | ### lynx is stupid - it decompresses any .gz file it finds to be text |
777 | ### use /bin/lynx to fetch files |
778 | sub _lynx_fetch { |
779 | my $self = shift; |
780 | my %hash = @_; |
781 | |
782 | my ($to); |
783 | my $tmpl = { |
784 | to => { required => 1, store => \$to } |
785 | }; |
786 | check( $tmpl, \%hash ) or return; |
787 | |
d4b3706f |
788 | ### see if we have a lynx binary ### |
79fd8837 |
789 | if( my $lynx = can_run('lynx') ) { |
790 | |
d4b3706f |
791 | unless( IPC::Cmd->can_capture_buffer ) { |
792 | $METHOD_FAIL->{'lynx'} = 1; |
793 | |
794 | return $self->_error(loc( |
795 | "Can not capture buffers. Can not use '%1' to fetch files", |
796 | 'lynx' )); |
797 | } |
79fd8837 |
798 | |
6e654618 |
799 | ### check if the HTTP resource exists ### |
800 | if ($self->uri =~ /^https?:\/\//i) { |
801 | my $cmd = [ |
802 | $lynx, |
803 | '-head', |
804 | '-source', |
805 | "-auth=anonymous:$FROM_EMAIL", |
806 | ]; |
807 | |
808 | push @$cmd, "-connect_timeout=$TIMEOUT" if $TIMEOUT; |
809 | |
810 | push @$cmd, $self->uri; |
811 | |
812 | ### shell out ### |
813 | my $head; |
814 | unless(run( command => $cmd, |
815 | buffer => \$head, |
816 | verbose => $DEBUG ) |
817 | ) { |
818 | return $self->_error(loc("Command failed: %1", $head || '')); |
819 | } |
820 | |
821 | unless($head =~ /^HTTP\/\d+\.\d+ 200\b/) { |
822 | return $self->_error(loc("Command failed: %1", $head || '')); |
823 | } |
824 | } |
825 | |
79fd8837 |
826 | ### write to the output file ourselves, since lynx ass_u_mes to much |
827 | my $local = FileHandle->new(">$to") |
828 | or return $self->_error(loc( |
829 | "Could not open '%1' for writing: %2",$to,$!)); |
830 | |
831 | ### dump to stdout ### |
832 | my $cmd = [ |
833 | $lynx, |
834 | '-source', |
835 | "-auth=anonymous:$FROM_EMAIL", |
836 | ]; |
837 | |
838 | push @$cmd, "-connect_timeout=$TIMEOUT" if $TIMEOUT; |
839 | |
d4b3706f |
840 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
6e654618 |
841 | push @$cmd, $self->uri; |
842 | |
843 | ### with IPC::Cmd > 0.41, this is fixed in teh library, |
844 | ### and there's no need for special casing any more. |
845 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
846 | # $IPC::Cmd::USE_IPC_RUN |
847 | # ? $self->uri |
848 | # : QUOTE. $self->uri .QUOTE; |
d4b3706f |
849 | |
79fd8837 |
850 | |
851 | ### shell out ### |
852 | my $captured; |
853 | unless(run( command => $cmd, |
854 | buffer => \$captured, |
855 | verbose => $DEBUG ) |
856 | ) { |
857 | return $self->_error(loc("Command failed: %1", $captured || '')); |
858 | } |
859 | |
860 | ### print to local file ### |
861 | ### XXX on a 404 with a special error page, $captured will actually |
862 | ### hold the contents of that page, and make it *appear* like the |
863 | ### request was a success, when really it wasn't :( |
864 | ### there doesn't seem to be an option for lynx to change the exit |
865 | ### code based on a 4XX status or so. |
866 | ### the closest we can come is using --error_file and parsing that, |
867 | ### which is very unreliable ;( |
868 | $local->print( $captured ); |
869 | $local->close or return; |
870 | |
871 | return $to; |
872 | |
873 | } else { |
874 | $METHOD_FAIL->{'lynx'} = 1; |
875 | return; |
876 | } |
877 | } |
878 | |
879 | ### use /bin/ncftp to fetch files |
880 | sub _ncftp_fetch { |
881 | my $self = shift; |
882 | my %hash = @_; |
883 | |
884 | my ($to); |
885 | my $tmpl = { |
886 | to => { required => 1, store => \$to } |
887 | }; |
888 | check( $tmpl, \%hash ) or return; |
889 | |
890 | ### we can only set passive mode in interactive sesssions, so bail out |
891 | ### if $FTP_PASSIVE is set |
892 | return if $FTP_PASSIVE; |
893 | |
d4b3706f |
894 | ### see if we have a ncftp binary ### |
79fd8837 |
895 | if( my $ncftp = can_run('ncftp') ) { |
896 | |
897 | my $cmd = [ |
898 | $ncftp, |
899 | '-V', # do not be verbose |
900 | '-p', $FROM_EMAIL, # email as password |
901 | $self->host, # hostname |
902 | dirname($to), # local dir for the file |
903 | # remote path to the file |
d4b3706f |
904 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
905 | $IPC::Cmd::USE_IPC_RUN |
906 | ? File::Spec::Unix->catdir( $self->path, $self->file ) |
907 | : QUOTE. File::Spec::Unix->catdir( |
908 | $self->path, $self->file ) .QUOTE |
909 | |
79fd8837 |
910 | ]; |
911 | |
912 | ### shell out ### |
913 | my $captured; |
914 | unless(run( command => $cmd, |
915 | buffer => \$captured, |
916 | verbose => $DEBUG ) |
917 | ) { |
918 | return $self->_error(loc("Command failed: %1", $captured || '')); |
919 | } |
920 | |
921 | return $to; |
922 | |
923 | } else { |
924 | $METHOD_FAIL->{'ncftp'} = 1; |
925 | return; |
926 | } |
927 | } |
928 | |
929 | ### use /bin/curl to fetch files |
930 | sub _curl_fetch { |
931 | my $self = shift; |
932 | my %hash = @_; |
933 | |
934 | my ($to); |
935 | my $tmpl = { |
936 | to => { required => 1, store => \$to } |
937 | }; |
938 | check( $tmpl, \%hash ) or return; |
939 | |
940 | if (my $curl = can_run('curl')) { |
941 | |
942 | ### these long opts are self explanatory - I like that -jmb |
6e654618 |
943 | my $cmd = [ $curl, '-q' ]; |
79fd8837 |
944 | |
945 | push(@$cmd, '--connect-timeout', $TIMEOUT) if $TIMEOUT; |
946 | |
947 | push(@$cmd, '--silent') unless $DEBUG; |
948 | |
949 | ### curl does the right thing with passive, regardless ### |
950 | if ($self->scheme eq 'ftp') { |
951 | push(@$cmd, '--user', "anonymous:$FROM_EMAIL"); |
952 | } |
953 | |
954 | ### curl doesn't follow 302 (temporarily moved) etc automatically |
955 | ### so we add --location to enable that. |
6e654618 |
956 | push @$cmd, '--fail', '--location', '--output', $to, $self->uri; |
957 | |
958 | ### with IPC::Cmd > 0.41, this is fixed in teh library, |
959 | ### and there's no need for special casing any more. |
960 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
961 | # $IPC::Cmd::USE_IPC_RUN |
962 | # ? ($to, $self->uri) |
963 | # : (QUOTE. $to .QUOTE, QUOTE. $self->uri .QUOTE); |
964 | |
79fd8837 |
965 | |
966 | my $captured; |
967 | unless(run( command => $cmd, |
968 | buffer => \$captured, |
969 | verbose => $DEBUG ) |
970 | ) { |
971 | |
972 | return $self->_error(loc("Command failed: %1", $captured || '')); |
973 | } |
974 | |
975 | return $to; |
976 | |
977 | } else { |
978 | $METHOD_FAIL->{'curl'} = 1; |
979 | return; |
980 | } |
981 | } |
982 | |
983 | |
984 | ### use File::Copy for fetching file:// urls ### |
9e5ea595 |
985 | ### |
986 | ### See section 3.10 of RFC 1738 (http://www.faqs.org/rfcs/rfc1738.html) |
987 | ### Also see wikipedia on file:// (http://en.wikipedia.org/wiki/File://) |
fe98d82b |
988 | ### |
9e5ea595 |
989 | |
79fd8837 |
990 | sub _file_fetch { |
991 | my $self = shift; |
992 | my %hash = @_; |
993 | |
994 | my ($to); |
995 | my $tmpl = { |
996 | to => { required => 1, store => \$to } |
997 | }; |
998 | check( $tmpl, \%hash ) or return; |
999 | |
9e5ea595 |
1000 | |
1001 | |
79fd8837 |
1002 | ### prefix a / on unix systems with a file uri, since it would |
1003 | ### look somewhat like this: |
9e5ea595 |
1004 | ### file:///home/kane/file |
1005 | ### wheras windows file uris for 'c:\some\dir\file' might look like: |
1006 | ### file:///C:/some/dir/file |
1007 | ### file:///C|/some/dir/file |
1008 | ### or for a network share '\\host\share\some\dir\file': |
1009 | ### file:////host/share/some/dir/file |
1010 | ### |
1011 | ### VMS file uri's for 'DISK$USER:[MY.NOTES]NOTE123456.TXT' might look like: |
1012 | ### file://vms.host.edu/disk$user/my/notes/note12345.txt |
1013 | ### |
1014 | |
1015 | my $path = $self->path; |
1016 | my $vol = $self->vol; |
1017 | my $share = $self->share; |
1018 | |
1019 | my $remote; |
1020 | if (!$share and $self->host) { |
1021 | return $self->_error(loc( |
1022 | "Currently %1 cannot handle hosts in %2 urls", |
1023 | 'File::Fetch', 'file://' |
1024 | )); |
1025 | } |
1026 | |
1027 | if( $vol ) { |
1028 | $path = File::Spec->catdir( split /\//, $path ); |
1029 | $remote = File::Spec->catpath( $vol, $path, $self->file); |
79fd8837 |
1030 | |
9e5ea595 |
1031 | } elsif( $share ) { |
1032 | ### win32 specific, and a share name, so we wont bother with File::Spec |
1033 | $path =~ s|/+|\\|g; |
1034 | $remote = "\\\\".$self->host."\\$share\\$path"; |
1035 | |
1036 | } else { |
5e6d05d2 |
1037 | ### File::Spec on VMS can not currently handle UNIX syntax. |
1038 | my $file_class = ON_VMS |
1039 | ? 'File::Spec::Unix' |
1040 | : 'File::Spec'; |
1041 | |
1042 | $remote = $file_class->catfile( $path, $self->file ); |
9e5ea595 |
1043 | } |
79fd8837 |
1044 | |
1045 | ### File::Copy is littered with 'die' statements :( ### |
1046 | my $rv = eval { File::Copy::copy( $remote, $to ) }; |
1047 | |
1048 | ### something went wrong ### |
1049 | if( !$rv or $@ ) { |
1050 | return $self->_error(loc("Could not copy '%1' to '%2': %3 %4", |
1051 | $remote, $to, $!, $@)); |
1052 | } |
1053 | |
1054 | return $to; |
1055 | } |
1056 | |
1057 | ### use /usr/bin/rsync to fetch files |
1058 | sub _rsync_fetch { |
1059 | my $self = shift; |
1060 | my %hash = @_; |
1061 | |
1062 | my ($to); |
1063 | my $tmpl = { |
1064 | to => { required => 1, store => \$to } |
1065 | }; |
1066 | check( $tmpl, \%hash ) or return; |
1067 | |
1068 | if (my $rsync = can_run('rsync')) { |
1069 | |
1070 | my $cmd = [ $rsync ]; |
1071 | |
1072 | ### XXX: rsync has no I/O timeouts at all, by default |
1073 | push(@$cmd, '--timeout=' . $TIMEOUT) if $TIMEOUT; |
1074 | |
1075 | push(@$cmd, '--quiet') unless $DEBUG; |
1076 | |
d4b3706f |
1077 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
6e654618 |
1078 | push @$cmd, $self->uri, $to; |
1079 | |
1080 | ### with IPC::Cmd > 0.41, this is fixed in teh library, |
1081 | ### and there's no need for special casing any more. |
1082 | ### DO NOT quote things for IPC::Run, it breaks stuff. |
1083 | # $IPC::Cmd::USE_IPC_RUN |
1084 | # ? ($to, $self->uri) |
1085 | # : (QUOTE. $to .QUOTE, QUOTE. $self->uri .QUOTE); |
79fd8837 |
1086 | |
1087 | my $captured; |
1088 | unless(run( command => $cmd, |
1089 | buffer => \$captured, |
1090 | verbose => $DEBUG ) |
1091 | ) { |
1092 | |
fe98d82b |
1093 | return $self->_error(loc("Command %1 failed: %2", |
1094 | "@$cmd" || '', $captured || '')); |
79fd8837 |
1095 | } |
1096 | |
1097 | return $to; |
1098 | |
1099 | } else { |
1100 | $METHOD_FAIL->{'rsync'} = 1; |
1101 | return; |
1102 | } |
1103 | } |
1104 | |
1105 | ################################# |
1106 | # |
1107 | # Error code |
1108 | # |
1109 | ################################# |
1110 | |
1111 | =pod |
1112 | |
1113 | =head2 $ff->error([BOOL]) |
1114 | |
1115 | Returns the last encountered error as string. |
1116 | Pass it a true value to get the C<Carp::longmess()> output instead. |
1117 | |
1118 | =cut |
1119 | |
d4b3706f |
1120 | ### error handling the way Archive::Extract does it |
1121 | sub _error { |
1122 | my $self = shift; |
1123 | my $error = shift; |
1124 | |
1125 | $self->_error_msg( $error ); |
1126 | $self->_error_msg_long( Carp::longmess($error) ); |
1127 | |
1128 | if( $WARN ) { |
1129 | carp $DEBUG ? $self->_error_msg_long : $self->_error_msg; |
79fd8837 |
1130 | } |
1131 | |
d4b3706f |
1132 | return; |
79fd8837 |
1133 | } |
1134 | |
d4b3706f |
1135 | sub error { |
1136 | my $self = shift; |
1137 | return shift() ? $self->_error_msg_long : $self->_error_msg; |
1138 | } |
79fd8837 |
1139 | |
1140 | |
1141 | 1; |
1142 | |
1143 | =pod |
1144 | |
1145 | =head1 HOW IT WORKS |
1146 | |
1147 | File::Fetch is able to fetch a variety of uris, by using several |
1148 | external programs and modules. |
1149 | |
1150 | Below is a mapping of what utilities will be used in what order |
1151 | for what schemes, if available: |
1152 | |
6e654618 |
1153 | file => LWP, lftp, file |
1154 | http => LWP, wget, curl, lftp, lynx |
1155 | ftp => LWP, Net::FTP, wget, curl, lftp, ncftp, ftp |
79fd8837 |
1156 | rsync => rsync |
1157 | |
1158 | If you'd like to disable the use of one or more of these utilities |
1159 | and/or modules, see the C<$BLACKLIST> variable further down. |
1160 | |
1161 | If a utility or module isn't available, it will be marked in a cache |
1162 | (see the C<$METHOD_FAIL> variable further down), so it will not be |
1163 | tried again. The C<fetch> method will only fail when all options are |
1164 | exhausted, and it was not able to retrieve the file. |
1165 | |
1166 | A special note about fetching files from an ftp uri: |
1167 | |
1168 | By default, all ftp connections are done in passive mode. To change |
1169 | that, see the C<$FTP_PASSIVE> variable further down. |
1170 | |
1171 | Furthermore, ftp uris only support anonymous connections, so no |
1172 | named user/password pair can be passed along. |
1173 | |
1174 | C</bin/ftp> is blacklisted by default; see the C<$BLACKLIST> variable |
1175 | further down. |
1176 | |
1177 | =head1 GLOBAL VARIABLES |
1178 | |
1179 | The behaviour of File::Fetch can be altered by changing the following |
1180 | global variables: |
1181 | |
1182 | =head2 $File::Fetch::FROM_EMAIL |
1183 | |
1184 | This is the email address that will be sent as your anonymous ftp |
1185 | password. |
1186 | |
1187 | Default is C<File-Fetch@example.com>. |
1188 | |
1189 | =head2 $File::Fetch::USER_AGENT |
1190 | |
1191 | This is the useragent as C<LWP> will report it. |
1192 | |
1193 | Default is C<File::Fetch/$VERSION>. |
1194 | |
1195 | =head2 $File::Fetch::FTP_PASSIVE |
1196 | |
1197 | This variable controls whether the environment variable C<FTP_PASSIVE> |
1198 | and any passive switches to commandline tools will be set to true. |
1199 | |
1200 | Default value is 1. |
1201 | |
1202 | Note: When $FTP_PASSIVE is true, C<ncftp> will not be used to fetch |
1203 | files, since passive mode can only be set interactively for this binary |
1204 | |
1205 | =head2 $File::Fetch::TIMEOUT |
1206 | |
1207 | When set, controls the network timeout (counted in seconds). |
1208 | |
1209 | Default value is 0. |
1210 | |
1211 | =head2 $File::Fetch::WARN |
1212 | |
1213 | This variable controls whether errors encountered internally by |
1214 | C<File::Fetch> should be C<carp>'d or not. |
1215 | |
1216 | Set to false to silence warnings. Inspect the output of the C<error()> |
1217 | method manually to see what went wrong. |
1218 | |
1219 | Defaults to C<true>. |
1220 | |
1221 | =head2 $File::Fetch::DEBUG |
1222 | |
1223 | This enables debugging output when calling commandline utilities to |
1224 | fetch files. |
1225 | This also enables C<Carp::longmess> errors, instead of the regular |
1226 | C<carp> errors. |
1227 | |
1228 | Good for tracking down why things don't work with your particular |
1229 | setup. |
1230 | |
1231 | Default is 0. |
1232 | |
1233 | =head2 $File::Fetch::BLACKLIST |
1234 | |
1235 | This is an array ref holding blacklisted modules/utilities for fetching |
1236 | files with. |
1237 | |
1238 | To disallow the use of, for example, C<LWP> and C<Net::FTP>, you could |
1239 | set $File::Fetch::BLACKLIST to: |
1240 | |
1241 | $File::Fetch::BLACKLIST = [qw|lwp netftp|] |
1242 | |
1243 | The default blacklist is [qw|ftp|], as C</bin/ftp> is rather unreliable. |
1244 | |
1245 | See the note on C<MAPPING> below. |
1246 | |
1247 | =head2 $File::Fetch::METHOD_FAIL |
1248 | |
1249 | This is a hashref registering what modules/utilities were known to fail |
1250 | for fetching files (mostly because they weren't installed). |
1251 | |
1252 | You can reset this cache by assigning an empty hashref to it, or |
1253 | individually remove keys. |
1254 | |
1255 | See the note on C<MAPPING> below. |
1256 | |
1257 | =head1 MAPPING |
1258 | |
1259 | |
1260 | Here's a quick mapping for the utilities/modules, and their names for |
1261 | the $BLACKLIST, $METHOD_FAIL and other internal functions. |
1262 | |
1263 | LWP => lwp |
1264 | Net::FTP => netftp |
1265 | wget => wget |
1266 | lynx => lynx |
1267 | ncftp => ncftp |
1268 | ftp => ftp |
1269 | curl => curl |
1270 | rsync => rsync |
6e654618 |
1271 | lftp => lftp |
79fd8837 |
1272 | |
1273 | =head1 FREQUENTLY ASKED QUESTIONS |
1274 | |
1275 | =head2 So how do I use a proxy with File::Fetch? |
1276 | |
1277 | C<File::Fetch> currently only supports proxies with LWP::UserAgent. |
1278 | You will need to set your environment variables accordingly. For |
1279 | example, to use an ftp proxy: |
1280 | |
1281 | $ENV{ftp_proxy} = 'foo.com'; |
1282 | |
1283 | Refer to the LWP::UserAgent manpage for more details. |
1284 | |
1285 | =head2 I used 'lynx' to fetch a file, but its contents is all wrong! |
1286 | |
1287 | C<lynx> can only fetch remote files by dumping its contents to C<STDOUT>, |
1288 | which we in turn capture. If that content is a 'custom' error file |
1289 | (like, say, a C<404 handler>), you will get that contents instead. |
1290 | |
1291 | Sadly, C<lynx> doesn't support any options to return a different exit |
1292 | code on non-C<200 OK> status, giving us no way to tell the difference |
1293 | between a 'successfull' fetch and a custom error page. |
1294 | |
1295 | Therefor, we recommend to only use C<lynx> as a last resort. This is |
1296 | why it is at the back of our list of methods to try as well. |
1297 | |
d4b3706f |
1298 | =head2 Files I'm trying to fetch have reserved characters or non-ASCII characters in them. What do I do? |
1299 | |
1300 | C<File::Fetch> is relatively smart about things. When trying to write |
1301 | a file to disk, it removes the C<query parameters> (see the |
1302 | C<output_file> method for details) from the file name before creating |
1303 | it. In most cases this suffices. |
1304 | |
1305 | If you have any other characters you need to escape, please install |
1306 | the C<URI::Escape> module from CPAN, and pre-encode your URI before |
1307 | passing it to C<File::Fetch>. You can read about the details of URIs |
1308 | and URI encoding here: |
1309 | |
1310 | http://www.faqs.org/rfcs/rfc2396.html |
1311 | |
79fd8837 |
1312 | =head1 TODO |
1313 | |
1314 | =over 4 |
1315 | |
1316 | =item Implement $PREFER_BIN |
1317 | |
1318 | To indicate to rather use commandline tools than modules |
1319 | |
a0ad4830 |
1320 | =back |
1321 | |
1322 | =head1 BUG REPORTS |
1323 | |
1324 | Please report bugs or other issues to E<lt>bug-file-fetch@rt.cpan.org<gt>. |
1325 | |
1326 | =head1 AUTHOR |
79fd8837 |
1327 | |
d4b3706f |
1328 | This module by Jos Boumans E<lt>kane@cpan.orgE<gt>. |
79fd8837 |
1329 | |
1330 | =head1 COPYRIGHT |
1331 | |
a0ad4830 |
1332 | This library is free software; you may redistribute and/or modify it |
1333 | under the same terms as Perl itself. |
79fd8837 |
1334 | |
79fd8837 |
1335 | |
1336 | =cut |
1337 | |
1338 | # Local variables: |
1339 | # c-indentation-style: bsd |
1340 | # c-basic-offset: 4 |
1341 | # indent-tabs-mode: nil |
1342 | # End: |
1343 | # vim: expandtab shiftwidth=4: |
1344 | |
1345 | |
1346 | |
1347 | |