| 1 | ###########################################################################
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| 2 | #
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| 3 | # UnknownPlug.pm -- Plugin for files you know about but Greenstone doesn't
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| 4 | #
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| 5 | # A component of the Greenstone digital library software from the New
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| 6 | # Zealand Digital Library Project at the University of Waikato, New
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| 7 | # Zealand.
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| 8 | #
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| 9 | # Copyright (C) 2001 Gordon W. Paynter
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| 10 | # Copyright (C) 2001 New Zealand Digital Library Project
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| 11 | #
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| 12 | # This program is free software; you can redistribute it and/or modify
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| 13 | # it under the terms of the GNU General Public License as published by
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| 14 | # the Free Software Foundation; either version 2 of the License, or
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| 15 | # (at your option) any later version.
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| 16 | #
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| 17 | # This program is distributed in the hope that it will be useful, but
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| 18 | # WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | # General Public License for more details.
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| 21 | #
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| 22 | # You should have received a copy of the GNU General Public License
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| 23 | # along with this program; if not, write to the Free Software
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| 24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 25 | #
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| 26 | ###########################################################################
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| 27 |
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| 28 | # UnknownPlug - a plugin for unknown files
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| 29 |
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| 30 | # This is a simple Plugin for importing files in formats that
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| 31 | # Greenstone doesn't know anything about. A fictional document will
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| 32 | # be created for every such file, and the file itself will be passed
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| 33 | # to Greenstone as the "associated file" of the document.
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| 34 |
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| 35 | # Here's an example where it is useful: I have a collection of
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| 36 | # pictures that include a couple of quicktime movie files with names
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| 37 | # like DCP_0163.MOV. Rather than write a new plugin for quicktime
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| 38 | # movies, I add this line to the collection configuration file:
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| 39 |
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| 40 | # plugin UnknownPlug -process_exp "*.MOV" -assoc_field "movie"
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| 41 |
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| 42 | # A document is created for each movie, with the associated movie
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| 43 | # file's name in the "movie" metadata field. In the collection's
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| 44 | # format strings, I use the {If} macro to output different text for
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| 45 | # each type of file, like this:
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| 46 |
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| 47 | # {If}{[movie],<HTML for displaying movie>}{If}{[Image],<HTML for displaying image>}
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| 48 |
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| 49 | # You can also add extra metadata, such as the Title, Subject, and
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| 50 | # Duration, with metadata.xml files and RecPlug. (If you want to use
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| 51 | # UnknownPlug with more than one type of file, you will have to add
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| 52 | # some sort of distinguishing metadata in this way.)
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| 53 |
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| 54 |
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| 55 |
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| 56 | package UnknownPlug;
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| 57 |
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| 58 | use BasPlug;
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| 59 |
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| 60 | use strict;
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| 61 | no strict 'refs'; # allow filehandles to be variables and viceversa
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| 62 |
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| 63 | sub BEGIN {
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| 64 | @UnknownPlug::ISA = ('BasPlug');
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| 65 | }
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| 66 |
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| 67 | my $arguments =
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| 68 | [ { 'name' => "assoc_field",
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| 69 | 'desc' => "{UnknownPlug.assoc_field}",
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| 70 | 'type' => "string",
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| 71 | 'deft' => "",
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| 72 | 'reqd' => "no" },
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| 73 | { 'name' => "file_format",
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| 74 | 'desc' => "{UnknownPlug.file_format}",
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| 75 | 'type' => "string",
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| 76 | 'deft' => "",
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| 77 | 'reqd' => "no" },
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| 78 | { 'name' => "mime_type",
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| 79 | 'desc' => "{UnknownPlug.mime_type}",
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| 80 | 'type' => "string",
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| 81 | 'deft' => "",
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| 82 | 'reqd' => "no" },
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| 83 | { 'name' => "srcicon",
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| 84 | 'desc' => "{UnknownPlug.srcicon}",
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| 85 | 'type' => "string",
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| 86 | 'deft' => "iconunknown",
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| 87 | 'reqd' => "no" },
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| 88 | { 'name' => "process_extension",
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| 89 | 'desc' => "{UnknownPlug.process_extension}",
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| 90 | 'type' => "string",
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| 91 | 'deft' => "",
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| 92 | 'reqd' => "no" } ];
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| 93 |
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| 94 | my $options = { 'name' => "UnknownPlug",
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| 95 | 'desc' => "{UnknownPlug.desc}",
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| 96 | 'abstract' => "no",
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| 97 | 'inherits' => "yes",
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| 98 | 'args' => $arguments };
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| 99 |
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| 100 |
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| 101 | sub new {
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| 102 | my ($class) = shift (@_);
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| 103 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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| 104 | push(@$pluginlist, $class);
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| 105 |
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| 106 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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| 107 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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| 108 |
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| 109 | my $self = new BasPlug($pluginlist, $inputargs, $hashArgOptLists);
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| 110 |
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| 111 | # "-process_extension" is a simpler alternative to -process_exp for non-regexp people
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| 112 | if (!$self->{'process_exp'} && $self->{'process_extension'}) {
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| 113 | $self->{'process_exp'} = "\\." . $self->{'process_extension'} . "\$";
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| 114 | }
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| 115 |
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| 116 | return bless $self, $class;
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| 117 | }
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| 118 |
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| 119 | sub get_default_process_exp {
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| 120 | return '';
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| 121 | }
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| 122 |
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| 123 |
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| 124 | # Associate the unknown file with the new document
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| 125 |
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| 126 | sub associate_unknown_file {
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| 127 | my $self = shift (@_);
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| 128 | my $filename = shift (@_); # filename with full path
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| 129 | my $file = shift (@_); # filename without path
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| 130 | my $doc_obj = shift (@_);
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| 131 |
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| 132 | my $verbosity = $self->{'verbosity'};
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| 133 | my $outhandle = $self->{'outhandle'};
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| 134 |
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| 135 | # check the filename is okay
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| 136 | return 0 if ($file eq "" || $filename eq "");
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| 137 |
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| 138 |
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| 139 | my $url = $file;
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| 140 | ##$url =~ s/ /%20/g;
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| 141 |
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| 142 | # Add the file as an associated file ...
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| 143 | my $section = $doc_obj->get_top_section();
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| 144 | my $file_format = $self->{'file_format'} || "unknown";
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| 145 | my $mime_type = $self->{'mime_type'} || "unknown/unknown";
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| 146 | my $assoc_field = $self->{'assoc_field'} || "unknown_file";
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| 147 |
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| 148 | $doc_obj->associate_file($filename, $file, $mime_type, $section);
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| 149 | $doc_obj->add_metadata ($section, "FileFormat", $file_format);
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| 150 | $doc_obj->add_metadata ($section, "MimeType", $mime_type);
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| 151 | $doc_obj->add_metadata ($section, $assoc_field, $file);
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| 152 |
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| 153 | $doc_obj->add_metadata ($section, "srclink",
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| 154 | "<a href=\"_httpprefix_/collect/[collection]/index/assoc/[assocfilepath]/[$assoc_field]\">");
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| 155 | #$doc_obj->add_metadata ($section, "srcicon", "_iconunknown_");
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| 156 | $doc_obj->add_metadata ($section, "srcicon", "_".$self->{'srcicon'}."_");
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| 157 | $doc_obj->add_metadata ($section, "/srclink", "</a>");
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| 158 |
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| 159 | # add NoText metadata which can be used to suppress the dummy text
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| 160 | $doc_obj->add_metadata ($section, "NoText", "1");
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| 161 |
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| 162 | return 1;
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| 163 | }
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| 164 |
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| 165 |
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| 166 |
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| 167 | # The UnknownPlug read() function. This function does all the right
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| 168 | # things to make general options work for a given plugin. UnknownPlug
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| 169 | # overrides read() because there is no need to read the actual text of
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| 170 | # the file in, because the contents of the file is not text...
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| 171 | #
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| 172 | #
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| 173 | # Return number of files processed, undef if can't process
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| 174 | #
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| 175 | # Note that $base_dir might be "" and that $file might include directories
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| 176 |
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| 177 | sub read {
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| 178 | my $self = shift (@_);
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| 179 | my ($pluginfo, $base_dir, $file, $metadata, $processor, $maxdocs, $total_count, $gli) = @_;
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| 180 |
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| 181 | my $outhandle = $self->{'outhandle'};
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| 182 |
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| 183 | # Make sure we're processing the correct file
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| 184 | my ($block_status,$filename) = $self->read_block(@_);
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| 185 | return $block_status if ((!defined $block_status) || ($block_status==0));
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| 186 |
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| 187 | print STDERR "<Processing n='$file' p='UnknownPlug'>\n" if ($gli);
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| 188 | print $outhandle "UnknownPlug processing \"$filename\"\n"
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| 189 | if $self->{'verbosity'} > 1;
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| 190 |
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| 191 | #if there's a leading directory name, eat it...
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| 192 | $file =~ s/^.*[\/\\]//;
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| 193 |
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| 194 | # create a new document
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| 195 | my $doc_obj = new doc ($filename, "indexed_doc");
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| 196 | my $top_section = $doc_obj->get_top_section();
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| 197 |
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| 198 | $doc_obj->set_OIDtype ($processor->{'OIDtype'}, $processor->{'OIDmetadata'});
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| 199 | $doc_obj->add_utf8_metadata($top_section, "Plugin", "$self->{'plugin_type'}");
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| 200 | $doc_obj->add_metadata($top_section, "Source", $file); # set the filename as Source metadata to be consistent with other plugins
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| 201 | $doc_obj->add_utf8_metadata($top_section, "FileSize", (-s $filename));
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| 202 |
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| 203 | # URL metadata (even invalid ones) are used to support internal
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| 204 | # links, so even if 'file_is_url' is off, still need to store info
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| 205 |
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| 206 | my $web_url = "http://$file";
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| 207 | $doc_obj->add_metadata($top_section, "URL", $web_url);
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| 208 |
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| 209 |
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| 210 | # associate the file with the document
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| 211 | if (associate_unknown_file($self, $filename, $file, $doc_obj) != 1)
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| 212 | {
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| 213 | if ($gli) {
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| 214 | print STDERR "<ProcessingError n='$file'>\n";
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| 215 | }
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| 216 | print $outhandle "UnknownPlug: couldn't process \"$filename\"\n";
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| 217 | return -1; # error during processing
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| 218 | }
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| 219 |
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| 220 | #create an empty text string so we don't break downstream plugins
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| 221 | my $text = &gsprintf::lookup_string("{BasPlug.dummy_text}",1);
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| 222 |
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| 223 | # include any metadata passed in from previous plugins
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| 224 | my $section = $doc_obj->get_top_section();
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| 225 | $self->extra_metadata ($doc_obj, $section, $metadata);
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| 226 |
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| 227 | $self->title_fallback($doc_obj,$section,$file);
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| 228 |
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| 229 | # do plugin specific processing of doc_obj
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| 230 | unless (defined ($self->process(\$text, $pluginfo, $base_dir, $file, $metadata, $doc_obj))) {
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| 231 | print STDERR "<ProcessingError n='$file'>\n" if ($gli);
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| 232 | return -1;
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| 233 | }
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| 234 |
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| 235 | # do any automatic metadata extraction
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| 236 | $self->auto_extract_metadata ($doc_obj);
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| 237 |
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| 238 | # add an OID
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| 239 | $doc_obj->set_OID();
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| 240 | $doc_obj->add_utf8_text($section, $text);
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| 241 |
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| 242 | # process the document
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| 243 | $processor->process($doc_obj);
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| 244 |
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| 245 | $self->{'num_processed'} ++;
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| 246 | return 1;
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| 247 | }
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| 248 |
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| 249 |
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| 250 | # UnknownPlug processing of doc_obj. In practice we don't need to do
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| 251 | # anything here because the read function takes care of everything.
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| 252 |
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| 253 | sub process {
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| 254 | my $self = shift (@_);
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| 255 | my ($textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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| 256 | my $outhandle = $self->{'outhandle'};
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| 257 |
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| 258 | return 1;
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| 259 | }
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| 260 |
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| 261 |
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| 262 | 1;
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| 263 |
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| 264 |
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| 265 |
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| 266 |
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| 267 |
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| 268 |
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| 269 |
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| 270 |
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| 271 |
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| 272 |
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| 273 |
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