1 | ###########################################################################
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2 | #
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3 | # AMCMetadataJSONPlugin.pm -- A plugin for JSON files resulting from page
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4 | # scrape of artists on the Australian Music Centre
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5 | # website
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6 | #
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7 | # A component of the Greenstone digital library software
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8 | # from the New Zealand Digital Library Project at the
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9 | # University of Waikato, New Zealand.
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10 | #
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11 | # Copyright 2016 New Zealand Digital Library Project
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12 | #
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13 | # This program is free software; you can redistribute it and/or modify
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14 | # it under the terms of the GNU General Public License as published by
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15 | # the Free Software Foundation; either version 2 of the License, or
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16 | # (at your option) any later version.
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17 | #
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18 | # This program is distributed in the hope that it will be useful,
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19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 | # GNU General Public License for more details.
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22 | #
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23 | # You should have received a copy of the GNU General Public License
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24 | # along with this program; if not, write to the Free Software
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25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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26 | #
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27 | ###########################################################################
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28 |
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29 | package AMCMetadataJSONPlugin;
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30 |
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31 |
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32 | use BaseImporter;
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33 | use MetadataRead;
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34 |
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35 | use strict;
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36 | no strict 'refs';
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37 | use multiread;
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38 |
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39 | use Encode;
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40 | use JSON;
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41 |
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42 | # methods with identical signatures take precedence in the order given in the ISA list.
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43 | sub BEGIN {
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44 | @AMCMetadataJSONPlugin::ISA = ('MetadataRead', 'BaseImporter');
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45 | }
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46 |
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47 |
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48 | my $arguments = [
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49 | { 'name' => "process_exp",
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50 | 'desc' => "{BaseImporter.process_exp}",
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51 | 'type' => "regexp",
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52 | 'reqd' => "no",
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53 | 'deft' => &get_default_process_exp() }
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54 |
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55 | ];
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56 |
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57 |
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58 | my $options = { 'name' => "AMCMetadataJSONPlugin",
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59 | 'desc' => "{AMCMetadataJSONPlugin.desc}",
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60 | 'abstract' => "no",
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61 | 'inherits' => "yes",
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62 | 'args' => $arguments };
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63 |
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64 |
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65 | sub new
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66 | {
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67 | my ($class) = shift (@_);
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68 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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69 | push(@$pluginlist, $class);
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70 |
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71 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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72 | push(@{$hashArgOptLists->{"OptList"}},$options);
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73 |
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74 | my $self = new BaseImporter($pluginlist, $inputargs, $hashArgOptLists);
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75 |
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76 | return bless $self, $class;
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77 | }
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78 |
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79 |
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80 | sub get_default_process_exp
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81 | {
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82 | return q^(?i)\.json$^;
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83 | }
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84 |
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85 | sub file_block_read {
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86 | my $self = shift (@_);
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87 | my ($pluginfo, $base_dir, $file, $block_hash, $metadata, $gli) = @_;
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88 |
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89 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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90 |
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91 | if (!-f $filename_full_path || !$self->can_process_this_file($filename_full_path)) {
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92 | return undef; # can't recognise
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93 | }
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94 |
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95 | # set this so we know this is a metadata file - needed for incremental
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96 | # build
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97 | # if this file changes, then we need to reimport everything
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98 | $block_hash->{'metadata_files'}->{$filename_full_path} = 1;
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99 |
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100 | return 1;
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101 | }
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102 |
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103 | sub metadata_read
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104 | {
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105 | my $self = shift (@_);
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106 | my ($pluginfo, $base_dir, $file, $block_hash,
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107 | $extrametakeys, $extrametadata, $extrametafile,
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108 | $processor, $gli, $aux) = @_;
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109 |
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110 | # Read metadata from JSON files
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111 | my $filename = &util::filename_cat($base_dir, $file);
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112 |
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113 | if (!-f $filename || !$self->can_process_this_file($filename)) {
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114 |
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115 | return undef;
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116 | }
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117 | print STDERR "\n<Processing n='$file' p='AMCMetadataJSONPlugin'>\n" if ($gli);
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118 | print STDERR "AMCMetadataJSONPlugin: processing $file\n" if ($self->{'verbosity'}) > 1;
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119 |
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120 | my $outhandle = $self->{'outhandle'};
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121 | my $failhandle = $self->{'failhandle'};
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122 |
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123 | # add the file to the block list so that it won't be processed in read, as we will do all we can with it here
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124 | $self->block_filename($block_hash,$filename);
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125 |
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126 |
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127 | # Read the JSON file to get the metadata
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128 | my $json_file_content;
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129 | open(JSON_FILE, "$filename");
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130 | my $json_file_reader = new multiread();
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131 | $json_file_reader->set_handle('AMCMetadataJSONPlugin::JSON_FILE');
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132 | $json_file_reader->read_file(\$json_file_content);
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133 |
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134 | # Would be nice if AMCMetadataJSONPlugin was extended to support a minus
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135 | # option to choose the character encoding the JSON file is in
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136 | # For now we will assume it is always in UTF8
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137 |
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138 | my $json_file_content_bytes = encode('UTF-8', $json_file_content);
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139 |
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140 | $json_file_content = decode("utf8",$json_file_content_bytes);
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141 |
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142 | close(JSON_FILE);
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143 |
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144 | # Split the file into lines and read the first line (contains the metadata names)
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145 | # $json_file_content =~ s/\r/\n/g; # Handle non-Unix line endings
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146 | # $json_file_content =~ s/\n+/\n/g;
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147 | # my @json_file_lines = split(/;/s, $json_file_content);
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148 |
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149 | # my $matching_file = $file;
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150 | # $matching_filename =~ s/\.js/\.{ogg,mp3,wav}/;
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151 |
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152 |
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153 | # my $json_metadata = {};
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154 |
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155 | print STDERR "**** json_metadata = $json_file_content\n";
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156 | # my $json_metadata = decode_json $json_file_content;
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157 | my $json_metadata = JSON->new->utf8->decode($json_file_content);
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158 |
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159 | # We can't associate any metadata without knowing the file to associate it with
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160 | my $audio_url = $json_metadata->{"audio_url"};
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161 | if (!defined $audio_url) {
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162 | $self->print_error($outhandle, $failhandle, $gli, $filename, "No audio_url metadata in JSON file: $file");
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163 |
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164 | return -1;
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165 | }
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166 |
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167 | my $local_audio_file = $audio_url;
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168 | $local_audio_file =~ s/^http(s?):\/\/.*\///;
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169 | my ($amc_id) = ($local_audio_file =~ m/^(.+)(?:\..+?)$/);
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170 |
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171 | ## print STDERR "***** local audio file = $local_audio_file\n";
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172 |
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173 | # Set up metadata table based on JSON file read in
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174 | foreach my $k (keys %$json_metadata) {
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175 | $json_metadata->{'amc.'.$k} = [ $json_metadata->{$k} ];
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176 | delete $json_metadata->{$k};
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177 | }
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178 | $json_metadata->{'amc.id'} = [ $amc_id ];
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179 |
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180 | # my $json_filename = shift(@$json_trackurl_array);
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181 | # $json_filename =~ s/\"//g; # strip off quotes
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182 | # delete $json_metadata->{"track_url"};
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183 |
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184 | # Associate the metadata now
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185 | $local_audio_file = &util::filename_to_regex($local_audio_file);
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186 |
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187 | ### print STDERR "**** setting up mapping for: $json_filename\n";
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188 |
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189 | # Set up mapping from local_audio_file to the created JSON metadata table
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190 | # so it 'sticks' to the file
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191 | $extrametadata->{$local_audio_file} = $json_metadata;
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192 | push(@$extrametakeys, $local_audio_file);
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193 | # record which file the metadata came from
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194 | if (!defined $extrametafile->{$local_audio_file}) {
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195 | $extrametafile->{$local_audio_file} = {};
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196 | }
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197 | # maps the file to full path
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198 | $extrametafile->{$local_audio_file}->{$file} = $filename;
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199 |
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200 | return 1;
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201 | }
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202 |
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203 | sub print_error
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204 | {
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205 |
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206 | my $self = shift(@_);
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207 | my ($outhandle, $failhandle, $gli, $file, $error) = @_;
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208 |
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209 | print $outhandle "AMCMetadataJSONPlugin Error: $file: $error\n";
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210 | print $failhandle "AMCMetadataJSONPlugin Error: $file: $error\n";
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211 | print STDERR "<ProcessingError n='$file' r='$error'/>\n" if ($gli);
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212 | }
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213 | 1;
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