281 lines
8.1 KiB
Ruby
281 lines
8.1 KiB
Ruby
require "digest/sha1"
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require_dependency "file_helper"
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require_dependency "url_helper"
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require_dependency "db_helper"
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require_dependency "file_store/local_store"
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class OptimizedImage < ActiveRecord::Base
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belongs_to :upload
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# BUMP UP if optimized image algorithm changes
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VERSION = 1
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def self.create_for(upload, width, height, opts={})
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return unless width > 0 && height > 0
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return if upload.try(:sha1).blank?
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DistributedMutex.synchronize("optimized_image_#{upload.id}_#{width}_#{height}") do
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# do we already have that thumbnail?
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thumbnail = find_by(upload_id: upload.id, width: width, height: height)
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# make sure we have an url
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if thumbnail && thumbnail.url.blank?
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thumbnail.destroy
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thumbnail = nil
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end
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# return the previous thumbnail if any
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return thumbnail unless thumbnail.nil?
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# create the thumbnail otherwise
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original_path = Discourse.store.path_for(upload)
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if original_path.blank?
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external_copy = Discourse.store.download(upload) rescue nil
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original_path = external_copy.try(:path)
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end
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if original_path.blank?
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Rails.logger.error("Could not find file in the store located at url: #{upload.url}")
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else
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# create a temp file with the same extension as the original
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extension = File.extname(original_path)
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temp_file = Tempfile.new(["discourse-thumbnail", extension])
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temp_path = temp_file.path
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if extension =~ /\.svg$/i
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FileUtils.cp(original_path, temp_path)
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resized = true
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elsif opts[:crop]
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resized = crop(original_path, temp_path, width, height, opts)
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else
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resized = resize(original_path, temp_path, width, height, opts)
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end
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if resized
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thumbnail = OptimizedImage.create!(
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upload_id: upload.id,
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sha1: Digest::SHA1.file(temp_path).hexdigest,
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extension: extension,
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width: width,
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height: height,
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url: "",
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)
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# store the optimized image and update its url
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File.open(temp_path) do |file|
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url = Discourse.store.store_optimized_image(file, thumbnail)
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if url.present?
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thumbnail.url = url
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thumbnail.save
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else
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Rails.logger.error("Failed to store optimized image #{width}x#{height} for #{upload.url}")
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end
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end
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else
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Rails.logger.error("Failed to create optimized image #{width}x#{height} for #{upload.url}")
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end
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# close && remove temp file
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temp_file.close!
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end
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# make sure we remove the cached copy from external stores
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if Discourse.store.external?
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external_copy.try(:close!) rescue nil
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end
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thumbnail
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end
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end
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def destroy
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OptimizedImage.transaction do
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Discourse.store.remove_optimized_image(self)
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super
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end
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end
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def local?
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!(url =~ /^(https?:)?\/\//)
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end
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def self.resize_instructions(from, to, dimensions, opts={})
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# NOTE: ORDER is important!
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%W{
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convert
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#{from}[0]
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-gravity center
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-background transparent
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-thumbnail #{dimensions}^
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-extent #{dimensions}
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-interpolate bicubic
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-unsharp 2x0.5+0.7+0
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-quality 98
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-profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')}
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#{to}
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}
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end
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def self.resize_instructions_animated(from, to, dimensions, opts={})
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%W{
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gifsicle
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--colors=256
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--resize-fit #{dimensions}
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--optimize=3
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--output #{to}
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#{from}
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}
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end
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def self.crop_instructions(from, to, dimensions, opts={})
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%W{
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convert
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#{from}[0]
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-gravity north
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-background transparent
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-thumbnail #{opts[:width]}
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-crop #{dimensions}+0+0
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-unsharp 2x0.5+0.7+0
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-quality 98
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-profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')}
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#{to}
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}
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end
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def self.crop_instructions_animated(from, to, dimensions, opts={})
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%W{
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gifsicle
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--crop 0,0+#{dimensions}
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--colors=256
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--optimize=3
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--output #{to}
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#{from}
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}
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end
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def self.downsize_instructions(from, to, dimensions, opts={})
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%W{
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convert
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#{from}[0]
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-gravity center
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-background transparent
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-resize #{dimensions}#{!!opts[:force_aspect_ratio] ? "\\!" : "\\>"}
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-profile #{File.join(Rails.root, 'vendor', 'data', 'RT_sRGB.icm')}
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#{to}
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}
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end
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def self.downsize_instructions_animated(from, to, dimensions, opts={})
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resize_instructions_animated(from, to, dimensions, opts)
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end
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def self.resize(from, to, width, height, opts={})
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optimize("resize", from, to, "#{width}x#{height}", opts)
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end
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def self.crop(from, to, width, height, opts={})
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opts[:width] = width
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optimize("crop", from, to, "#{width}x#{height}", opts)
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end
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def self.downsize(from, to, dimensions, opts={})
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optimize("downsize", from, to, dimensions, opts)
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end
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def self.optimize(operation, from, to, dimensions, opts={})
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method_name = "#{operation}_instructions"
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if !!opts[:allow_animation] && (from =~ /\.GIF$/i || opts[:filename] =~ /\.GIF$/i)
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method_name += "_animated"
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end
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instructions = self.send(method_name.to_sym, from, to, dimensions, opts)
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convert_with(instructions, to)
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end
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def self.convert_with(instructions, to)
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`#{instructions.join(" ")} &> /dev/null`
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return false if $?.exitstatus != 0
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ImageOptim.new.optimize_image!(to)
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true
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rescue
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Rails.logger.error("Could not optimize image: #{to}")
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false
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end
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def self.migrate_to_new_scheme(limit=50)
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problems = []
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if SiteSetting.migrate_to_new_scheme
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max_file_size_kb = SiteSetting.max_image_size_kb.kilobytes
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local_store = FileStore::LocalStore.new
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OptimizedImage.includes(:upload)
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.where("url NOT LIKE '%/optimized/_X/%'")
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.limit(limit)
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.order(id: :desc)
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.each do |optimized_image|
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begin
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# keep track of the url
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previous_url = optimized_image.url.dup
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# where is the file currently stored?
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external = previous_url =~ /^\/\//
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# download if external
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if external
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url = SiteSetting.scheme + ":" + previous_url
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file = FileHelper.download(url, max_file_size_kb, "discourse", true) rescue nil
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path = file.path
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else
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path = local_store.path_for(optimized_image)
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file = File.open(path)
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end
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# compute SHA if missing
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if optimized_image.sha1.blank?
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optimized_image.sha1 = Digest::SHA1.file(path).hexdigest
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end
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# optimize if image
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ImageOptim.new.optimize_image!(path)
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# store to new location & update the filesize
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File.open(path) do |f|
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optimized_image.url = Discourse.store.store_optimized_image(f, optimized_image)
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optimized_image.save
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end
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# remap the URLs
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DbHelper.remap(UrlHelper.absolute(previous_url), optimized_image.url) unless external
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DbHelper.remap(previous_url, optimized_image.url)
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# remove the old file (when local)
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unless external
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FileUtils.rm(path, force: true) rescue nil
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end
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rescue => e
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problems << { optimized_image: optimized_image, ex: e }
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# just ditch the optimized image if there was any errors
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optimized_image.destroy
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ensure
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file.try(:unlink) rescue nil
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file.try(:close) rescue nil
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end
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end
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end
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problems
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end
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end
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# == Schema Information
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#
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# Table name: optimized_images
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#
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# id :integer not null, primary key
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# sha1 :string(40) not null
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# extension :string(10) not null
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# width :integer not null
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# height :integer not null
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# upload_id :integer not null
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# url :string not null
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#
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# Indexes
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#
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# index_optimized_images_on_upload_id (upload_id)
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# index_optimized_images_on_upload_id_and_width_and_height (upload_id,width,height) UNIQUE
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#
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