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class Image
attr_reader :path
def initialize(path, exif = ExifParser.new)
@path = path
@exif = exif
ensure_in_whitelist!(@path)
end
def filename
@filename ||= sanitize(@path)
end
def content_type
@content_type ||= ::MIME::Types.type_for(filename).first.to_s
end
def geolocation
@exif.parse_geolocation_from(@path)
end
def sha256
@sha256 ||= Digest::SHA256.file(@path).to_s
end
def resize_to_fit(width:, height:)
manipulate! do |image|
image.resize "#{width}x#{height}"
image = yield(image) if block_given?
image
end
end
def resize_to_fill(width:, height:, gravity: 'Center')
manipulate! do |image|
columns, rows = image[:dimensions]
image.combine_options do |cmd|
if width != columns || height != rows
scale_x = width/columns.to_f
scale_y = height/rows.to_f
if scale_x >= scale_y
columns = (scale_x * (columns + 0.5)).round
rows = (scale_x * (rows + 0.5)).round
cmd.resize "#{columns}"
else
columns = (scale_y * (columns + 0.5)).round
rows = (scale_y * (rows + 0.5)).round
cmd.resize "x#{rows}"
end
end
cmd.gravity gravity
cmd.background "rgba(255,255,255,0.0)"
cmd.extent "#{width}x#{height}" if columns != width || rows != height
end
image = yield(image) if block_given?
image
end
end
def watermark(message)
manipulate! do |image|
image.combine_options do |c|
c.gravity 'Southeast'
c.draw "text 10,10 \"#{message} on CakeSide.com\""
c.font 'helvetica'
c.fill("#FFFFFF")
c.pointsize 28
end
image
end
end
private
def manipulate!
image = ::MiniMagick::Image.open(path)
image = yield(image)
image.write(path)
image.run_command("identify", path)
rescue StandardError => error
Rails.logger.error("#{error.message} #{error.backtrace.join(', ')}")
ensure
image.try(:destroy!)
end
def sanitize(name)
name = name.gsub("\\", "/")
name = File.basename(name)
name = name.gsub(sanitize_regexp,"_")
name = "_#{name}" if name =~ /\A\.+\z/
name = "unnamed" if name.size == 0
return name.mb_chars.to_s
end
def sanitize_regexp
/[^a-zA-Z0-9\.\-\+_]/
end
def ensure_in_whitelist!(path)
unless %w(.jpg .jpeg .gif .png .bmp .tif).include?(File.extname(path).downcase)
raise StandardError.new("This file is not in the whitelist. #{path}")
end
end
end
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