JezK
Edit File: gzip.rb
module Sprockets module Utils class Gzip # Private: Generates a gzipped file based off of reference file. def initialize(asset) @content_type = asset.content_type @source = asset.source @charset = asset.charset end # What non-text mime types should we compress? This list comes from: # https://www.fastly.com/blog/new-gzip-settings-and-deciding-what-compress COMPRESSABLE_MIME_TYPES = { "application/vnd.ms-fontobject" => true, "application/x-font-opentype" => true, "application/x-font-ttf" => true, "image/x-icon" => true, "image/svg+xml" => true } # Private: Returns whether or not an asset can be compressed. # # We want to compress any file that is text based. # You do not want to compress binary # files as they may already be compressed and running them # through a compression algorithm would make them larger. # # Return Boolean. def can_compress?(mime_types) # The "charset" of a mime type is present if the value is # encoded text. We can check this value to see if the asset # can be compressed. # # We also check against our list of non-text compressible mime types @charset || COMPRESSABLE_MIME_TYPES.include?(@content_type) end # Private: Opposite of `can_compress?`. # # Returns Boolean. def cannot_compress?(mime_types) !can_compress?(mime_types) end # Private: Generates a gzipped file based off of reference asset. # # Compresses the target asset's contents and puts it into a file with # the same name plus a `.gz` extension in the same folder as the original. # Does not modify the target asset. # # Returns nothing. def compress(target) mtime = PathUtils.stat(target).mtime PathUtils.atomic_write("#{target}.gz") do |f| gz = Zlib::GzipWriter.new(f, Zlib::BEST_COMPRESSION) gz.mtime = mtime gz.write(@source) gz.close File.utime(mtime, mtime, f.path) end nil end end end end