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- # Redmine - project management software
- # Copyright (C) 2006-2017 Jean-Philippe Lang
- #
- # This program is free software; you can redistribute it and/or
- # modify it under the terms of the GNU General Public License
- # as published by the Free Software Foundation; either version 2
- # of the License, or (at your option) any later version.
- #
- # This program is distributed in the hope that it will be useful,
- # but WITHOUT ANY WARRANTY; without even the implied warranty of
- # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- # GNU General Public License for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with this program; if not, write to the Free Software
- # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-
- require 'fileutils'
- require 'mimemagic'
-
- module Redmine
- module Thumbnail
- extend Redmine::Utils::Shell
-
- CONVERT_BIN = (Redmine::Configuration['imagemagick_convert_command'] || 'convert').freeze
- ALLOWED_TYPES = %w(image/bmp image/gif image/jpeg image/png)
-
- # Generates a thumbnail for the source image to target
- def self.generate(source, target, size)
- return nil unless convert_available?
- unless File.exists?(target)
- # Make sure we only invoke Imagemagick if the file type is allowed
- unless File.open(source) {|f| ALLOWED_TYPES.include? MimeMagic.by_magic(f).try(:type) }
- return nil
- end
- directory = File.dirname(target)
- unless File.exists?(directory)
- FileUtils.mkdir_p directory
- end
- size_option = "#{size}x#{size}>"
- cmd = "#{shell_quote CONVERT_BIN} #{shell_quote source} -auto-orient -thumbnail #{shell_quote size_option} #{shell_quote target}"
- unless system(cmd)
- logger.error("Creating thumbnail failed (#{$?}):\nCommand: #{cmd}")
- return nil
- end
- end
- target
- end
-
- def self.convert_available?
- return @convert_available if defined?(@convert_available)
- @convert_available = system("#{shell_quote CONVERT_BIN} -version") rescue false
- logger.warn("Imagemagick's convert binary (#{CONVERT_BIN}) not available") unless @convert_available
- @convert_available
- end
-
- def self.logger
- Rails.logger
- end
- end
- end
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