1 | ###########################################################################
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2 | #
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3 | # EMAILPlug.pm - a plugin for parsing email files
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4 | #
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5 | # A component of the Greenstone digital library software
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6 | # from the New Zealand Digital Library Project at the
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7 | # University of Waikato, New Zealand.
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8 | #
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9 | # Copyright (C) 1999 New Zealand Digital Library Project
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10 | #
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11 | # This program is free software; you can redistribute it and/or modify
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12 | # it under the terms of the GNU General Public License as published by
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13 | # the Free Software Foundation; either version 2 of the License, or
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14 | # (at your option) any later version.
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15 | #
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16 | # This program is distributed in the hope that it will be useful,
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17 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 | # GNU General Public License for more details.
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20 | #
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21 | # You should have received a copy of the GNU General Public License
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22 | # along with this program; if not, write to the Free Software
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23 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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24 | #
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25 | ###########################################################################
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26 |
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27 |
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28 | #
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29 | # EMAILPlug reads an email file (*.email)
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30 | #
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31 | # Version 1.1 1999 Sep 20 by Gordon Paynter ([email protected])
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32 | # loosely based on the original HTMLPlug code
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33 | #
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34 | # Document text:
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35 | # The document text consists of all the text occuring after the first
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36 | # blank line in this document.
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37 | #
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38 | # Metadata:
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39 | # $Subject Subject: header
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40 | # $To To: header
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41 | # $From From: header - this will be stored as Creator
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42 | # $DateText Date: header
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43 | # $Date Date: header in GSDL format (eg: 19990924)
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44 | # $OtherHeaders All the other headers
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45 | # $NewText The unquoted text in this message
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46 | #
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47 |
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48 |
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49 | package EMAILPlug;
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50 |
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51 | use BasPlug;
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52 | use sorttools;
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53 | use util;
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54 |
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55 |
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56 | # EMAILPlug is a sub-class of BasPlug.
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57 |
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58 | sub BEGIN {
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59 | @ISA = ('BasPlug');
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60 | }
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61 |
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62 |
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63 | # Create a new EMAILPlug object with which to parse a file.
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64 | # This is done by creating a new BasPlug and usig bless to
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65 | # turn it into an EMAILPlug.
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66 |
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67 | sub new {
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68 | my ($class) = @_;
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69 | $self = new BasPlug ();
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70 |
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71 | return bless $self, $class;
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72 | }
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73 |
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74 |
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75 | # Is the EMAILPlug recursive? No.
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76 |
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77 | sub is_recursive {
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78 | my $self = shift (@_);
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79 |
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80 | return 0; # this is not a recursive plugin
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81 | }
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82 |
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83 |
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84 | #
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85 | # read
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86 | #
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87 | # read attempts to read a file and store its contents in a
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88 | # new document object.
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89 | #
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90 | # Returns: number of files processed or undef if can't process
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91 | # This plugin only processes one file at a time.
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92 | #
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93 | # Note: $base_dir might be "" and $file might include directories,
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94 | # but that doesn't affect EMAILPlug
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95 | #
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96 |
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97 | sub read {
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98 | my $self = shift (@_);
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99 | my ($pluginfo, $base_dir, $file, $metadata, $processor) = @_;
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100 |
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101 | # Make sure file exists and is an email file
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102 | my $filename = &util::filename_cat($base_dir, $file);
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103 | return undef unless ($filename =~ /\.email$/i && (-e $filename));
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104 |
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105 | print STDERR "EMAILPlug: processing $filename\n" if $processor->{'verbosity'};
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106 |
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107 | # create a new document object
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108 | my $doc_obj = new doc ($file, "indexed_doc");
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109 | open (FILE, $filename) || die "EMAILPlug::read - can't open $filename\n";
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110 | my $cursection = $doc_obj->get_top_section();
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111 |
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112 | # Metadata fields
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113 | my $Subject = "";
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114 | my $To = "";
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115 | my $From = "";
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116 | my $DateText = "";
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117 | my $Date = "";
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118 | my $OtherHeaders = "";
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119 | my $NewText = "";
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120 | my $text = "";
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121 | my $line = "";
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122 |
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123 | my $headers_read = 0;
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124 |
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125 | # Read and process each line in te email file.
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126 | # Each file consists of a set of header lines, then a blank line,
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127 | # then the body of the email.
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128 | while (<FILE>) {
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129 |
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130 | $line = $_;
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131 |
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132 | # Remove carriage returns from the line.
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133 | # We will later replace single cariage returns with <BR> tags
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134 | # and double carriage returns with <P> tags.
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135 | $line =~ s/\n/ /g;
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136 |
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137 | if ($headers_read) {
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138 | # The headers have been read, so add this line to the body text
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139 | $text .= "$line\n";
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140 | # If the line isn't quoted, add it to the NewText metadata
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141 | if ($line =~ /^[^>|]/) {
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142 | $NewText .= "$line\n";
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143 | }
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144 |
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145 | } elsif ($line =~ /^\s*$/) {
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146 | # An empty line signals the end of the headers.
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147 | $headers_read = 1;
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148 |
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149 | } else {
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150 | # Read a line of header information and add it to the metadata
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151 | $line .= "\n";
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152 | if ($line =~ /^From:/) {
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153 | $line =~ s/^From:\s*//;
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154 | $From .= $line;
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155 | } elsif ($line =~ /^To:/) {
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156 | $line =~ s/^To:\s*//;
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157 | $To .= $line;
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158 | } elsif ($line =~ /^Date:/) {
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159 | $line =~ s/^Date:\s*//;
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160 | $DateText .= $line;
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161 | if ($Date !~ /\d+/) {
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162 | # Convert the date text to internal date format
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163 | my ($day, $month, $year) = $line =~ /(\d?\d)\s([A-Z][a-z][a-z])\s(\d\d\d\d)/;
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164 | $Date = &sorttools::format_date($day, $month, $year);
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165 | }
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166 | } elsif ($line =~ /^Subject:/) {
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167 | $line =~ s/^Subject:\s*//;
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168 | $Subject .= $line;
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169 | } else {
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170 | $OtherHeaders .= $line;
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171 | }
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172 | }
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173 | }
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174 |
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175 | # Add Subject metadata
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176 | $Subject = &text_into_html($Subject);
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177 | $Subject = "No Subject" unless ($Subject =~ /\w/);
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178 | $doc_obj->add_metadata ($cursection, "Subject", $Subject);
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179 |
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180 | # Add Sender
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181 | $From = &text_into_html($From);
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182 | $From = "No Sender" unless ($From =~ /\w/);
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183 | $doc_obj->add_metadata ($cursection, "Creator", $From);
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184 |
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185 | # Add Recipient
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186 | $To = &text_into_html($To);
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187 | $To = "No Recipient" unless ($To =~ /\w/);
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188 | $doc_obj->add_metadata ($cursection, "To", $To);
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189 |
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190 | # Add Date Text
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191 | $DateText =~ &text_into_html($Date);
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192 | $doc_obj->add_metadata ($cursection, "DateText", $DateText) if ($DateText =~ /\w/);
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193 |
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194 | # Add Date
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195 | $Date =~ &text_into_html($Date);
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196 | $doc_obj->add_metadata ($cursection, "Date", $Date) if ($Date =~ /\w/);
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197 |
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198 | # Add Other Headers
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199 | $OtherHeaders = &text_into_html($OtherHeaders);
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200 | $doc_obj->add_metadata ($cursection, "OtherHeaders", $OtherHeaders) if ($OtherHeaders =~ /\w/);
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201 |
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202 | # Add New Text
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203 | $NewText = &text_into_html($NewText);
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204 | $doc_obj->add_metadata ($cursection, "NewText", $NewText) if ($NewText =~ /\w/);
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205 |
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206 | # Add text
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207 | $text =~ s/<BR>\s*<BR>/<P>/g;
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208 | $text = &text_into_html($text);
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209 | $doc_obj->add_text ($cursection, $text) if ($text =~ /\w/);
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210 |
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211 | # Add the OID - that is, the big HASH value used as a unique ID
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212 | $doc_obj->set_OID ();
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213 |
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214 | # Process the document
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215 | $processor->process($doc_obj);
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216 |
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217 | return 1; # processed the file
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218 | }
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219 |
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220 |
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221 | 1;
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222 |
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223 |
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224 |
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225 | #
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226 | # Convert a text string into HTML.
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227 | #
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228 | # The HTML is going to be inserted into a GML file, so
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229 | # we have to be careful not to use symbols like ">",
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230 | # which ocurs frequently in email messages (and use
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231 | # > instead.
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232 | #
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233 | # This function also turns links and email addresses into hyperlinks,
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234 | # and replaces carriage returns with <BR> tags (and multiple carriage
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235 | # returns with <P> tags).
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236 | #
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237 |
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238 | sub text_into_html {
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239 | my ($text) = @_;
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240 |
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241 |
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242 | # Convert problem charaters into HTML symbols
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243 | $text =~ s/&/&/g;
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244 | $text =~ s/</</g;
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245 | $text =~ s/>/>/g;
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246 | $text =~ s/\"/"/g;
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247 |
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248 | # convert email addresses and URLs into links
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249 | $text =~ s/([\w\d\.\-]+@[\w\d\.\-]+)/<a href=\"mailto:$1\">$1<\/a>/g;
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250 | $text =~ s/(http:\/\/[\w\d\.\-]+[\/\w\d\.\-]*)/<a href=\"$1">$1<\/a>/g;
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251 |
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252 | # Clean up whitespace and convert \n charaters to <BR> or <P>
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253 | $text =~ s/ +/ /g;
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254 | $text =~ s/\s*$//;
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255 | $text =~ s/^\s*//;
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256 | $text =~ s/\n/\n<BR>/g;
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257 | $text =~ s/<BR>\s*<BR>/<P>/g;
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258 |
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259 | return $text;
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260 | }
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261 |
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262 |
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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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