1 | ###########################################################################
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2 | #
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3 | # imageaction.pm --
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4 | # A component of the Greenstone digital library software
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5 | # from the New Zealand Digital Library Project at the
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6 | # University of Waikato, New Zealand.
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7 | #
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8 | # Copyright (C) 2009 New Zealand Digital Library Project
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9 | #
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10 | # This program is free software; you can redistr te it and/or modify
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11 | # it under the terms of the GNU General Public License as published by
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12 | # the Free Software Foundation; either version 2 of the License, or
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13 | # (at your option) any later version.
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14 | #
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15 | # This program is distributed in the hope that it will be useful,
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16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 | # GNU General Public License for more details.
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19 | #
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20 | # You should have received a copy of the GNU General Public License
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21 | # along with this program; if not, write to the Free Software
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22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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23 | #
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24 | ###########################################################################
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25 |
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26 | package imageaction;
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27 |
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28 | use strict;
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29 |
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30 | use cgiactions::baseaction;
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31 | use util;
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32 |
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33 | @imageaction::ISA = ('baseaction');
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34 |
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35 |
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36 | my $action_table =
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37 | {
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38 | "fit-screen" => { 'compulsory-args' => [ "pageWidth", "pageHeight",
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39 | "assocDir", "assocFile" ],
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40 | 'optional-args' => [ "orientation" ] },
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41 |
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42 | };
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43 |
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44 |
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45 | sub new
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46 | {
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47 | my $class = shift (@_);
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48 | my ($gsdl_cgi,$iis6_mode) = @_;
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49 |
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50 | my $self = new baseaction($action_table,$gsdl_cgi,$iis6_mode);
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51 |
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52 | return bless $self, $class;
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53 | }
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54 |
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55 |
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56 |
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57 | sub get_mime_type
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58 | {
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59 | my $self = shift @_;
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60 |
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61 | my ($file) = @_;
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62 |
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63 | my %image_mime_re =
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64 | (
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65 | "gif" => "image/gif",
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66 | "jpe?g" => "image/jpeg",
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67 | "png" => "image/png",
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68 | "tiff?" => "image/tiff",
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69 | "bmp" => "image/bmp"
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70 | );
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71 |
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72 | my ($ext) = ($file =~ m/^.*\.(.*)?$/);
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73 |
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74 | foreach my $re (keys %image_mime_re) {
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75 | if ($ext =~ m/^$re$/i) {
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76 | return $image_mime_re{$re};
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77 | }
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78 | }
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79 |
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80 | return undef;
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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 |
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86 | sub fit_screen
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87 | {
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88 | my $self = shift @_;
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89 |
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90 | my $username = $self->{'username'};
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91 | my $collect = $self->{'collect'};
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92 | my $gsdl_cgi = $self->{'gsdl_cgi'};
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93 | my $gsdlhome = $self->{'gsdlhome'};
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94 |
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95 |
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96 | if ($baseaction::authentication_enabled) {
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97 | # Ensure the user is allowed to edit this collection
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98 | &authenticate_user($gsdl_cgi, $username, $collect);
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99 | }
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100 |
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101 | my $site = $self->{'site'};
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102 | my $collect_directory = $gsdl_cgi->get_collection_dir($site);
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103 | #my $collect_directory = &util::filename_cat($gsdlhome, "collect");
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104 | # $gsdl_cgi->checked_chdir($collect_directory);
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105 |
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106 |
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107 | # # Make sure the collection isn't locked by someone else
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108 | #
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109 |
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110 | $self->lock_collection($username, $collect);
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111 |
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112 | # look up additional args
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113 |
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114 | my $pageWidth = $self->{'pageWidth'};
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115 | my $pageHeight = $self->{'pageHeight'};
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116 | my $assocDir = $self->{'assocDir'};
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117 | my $assocFile = $self->{'assocFile'};
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118 |
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119 | my $orientation = $self->{'orientation'};
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120 | $orientation = "portrait" if (!defined $orientation);
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121 |
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122 | my $toplevel_assoc_dir
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123 | = &util::filename_cat($collect_directory,$collect,"index","assoc");
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124 | my $src_full_assoc_filename
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125 | = &util::filename_cat($toplevel_assoc_dir,$assocDir,$assocFile);
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126 |
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127 | my $dst_width = $pageWidth;
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128 | my $dst_height = $pageHeight;
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129 |
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130 | my $opt_ls = ($orientation eq "landscape") ? "-r" : "";
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131 |
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132 | my $dst_file = $dst_width."x".$dst_height."$opt_ls-$assocFile";
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133 |
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134 | my $dst_full_assoc_filename
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135 | = &util::filename_cat($toplevel_assoc_dir,$assocDir,$dst_file);
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136 |
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137 | # **** What if assoc folder is on read-only medium such as CD-ROM?
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138 | # Should really switch to using some collection specific tmp area
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139 | # => test if top_level assoc dir has write permission?
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140 |
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141 | if (!-w $toplevel_assoc_dir) {
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142 | $gsdl_cgi->generate_error("Cannot write out resized image $dst_full_assoc_filename.");
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143 | }
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144 |
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145 | # For now will assume it is writable
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146 |
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147 | if (!-e $dst_full_assoc_filename) {
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148 | # generate resized image
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149 |
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150 | # Better to make sure ImageMagick is installed
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151 |
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152 | my $resize = "-filter Lanczos -resize $dst_width"."x"."$dst_height!";
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153 | # use of "!" forces convert to produce exactly these dimensions, rather
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154 | # than preserving aspect ratio. In actual fact, it is intended that
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155 | # the width and height values passed in *do* preserve the aspect ratio
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156 | # Doing it this way makes it easier for the web browser to know (ahead of time) the
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157 | # width and height of the image that will be generated (useful for putting into
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158 | # <img> and <div> tags
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159 |
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160 |
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161 | my $cmd = "\"".&util::get_perl_exec()."\" -S gs-magick.pl convert \"$src_full_assoc_filename\" ";
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162 | $cmd .= "-rotate 90 " if ($orientation eq "landscape");
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163 |
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164 | $cmd .= "$resize \"$dst_full_assoc_filename\"";
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165 |
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166 | `$cmd`;
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167 |
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168 | # generate resized image in assoc file area (if writable)
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169 | # otherwise in (collection's??) tmp directory
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170 | }
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171 |
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172 | my $mime_type = $self->get_mime_type($dst_file);
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173 |
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174 | if (defined $mime_type) {
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175 | # now output it with suitable mime header
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176 | print STDOUT "Content-type:$mime_type\n\n";
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177 |
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178 | if (open(IMGIN,"<$dst_full_assoc_filename")) {
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179 | binmode IMGIN;
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180 | binmode STDOUT;
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181 |
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182 | my $data;
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183 | while (read(IMGIN,$data,1024) != 0) {
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184 | print STDOUT $data;
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185 | }
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186 |
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187 | close(IMGIN);
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188 |
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189 | #system("cat \"$dst_full_assoc_filename\"");
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190 | }
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191 | else {
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192 | $gsdl_cgi->generate_error("Unable to open $dst_full_assoc_filename for output");
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193 | }
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194 | }
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195 | else {
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196 | $gsdl_cgi->generate_error("Unrecognised image mime-type for $dst_file");
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197 | }
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198 |
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199 | }
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200 |
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201 |
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202 | 1;
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