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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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