mirror of
https://github.com/discourse/discourse.git
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142571bba0
* `rescue nil` is a really bad pattern to use in our code base. We should rescue errors that we expect the code to throw and not rescue everything because we're unsure of what errors the code would throw. This would reduce the amount of pain we face when debugging why something isn't working as expexted. I've been bitten countless of times by errors being swallowed as a result during debugging sessions.
331 lines
9.0 KiB
Ruby
331 lines
9.0 KiB
Ruby
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.lock(upload_id, width, height)
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@hostname ||= `hostname`.strip rescue "unknown"
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# note, the extra lock here ensures we only optimize one image per machine
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# this can very easily lead to runaway CPU so slowing it down is beneficial
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DistributedMutex.synchronize("optimized_image_host_#{@hostname}") do
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DistributedMutex.synchronize("optimized_image_#{upload_id}_#{width}_#{height}") do
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yield
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end
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end
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end
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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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lock(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: Upload.generate_digest(temp_path),
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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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end
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end
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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&.close
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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.safe_path?(path)
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# this matches instructions which call #to_s
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path = path.to_s
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return false if path != File.expand_path(path)
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return false if path !~ /\A[\w\-\.\/]+\z/m
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true
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end
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def self.ensure_safe_paths!(*paths)
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paths.each do |path|
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raise Discourse::InvalidAccess unless safe_path?(path)
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end
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end
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def self.thumbnail_or_resize
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SiteSetting.strip_image_metadata ? "thumbnail" : "resize"
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end
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def self.resize_instructions(from, to, dimensions, opts = {})
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ensure_safe_paths!(from, to)
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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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-auto-orient
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-gravity center
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-background transparent
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-#{thumbnail_or_resize} #{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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-interlace none
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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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ensure_safe_paths!(from, to)
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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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ensure_safe_paths!(from, to)
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%W{
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convert
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#{from}[0]
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-auto-orient
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-gravity north
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-background transparent
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-#{thumbnail_or_resize} #{opts[:width]}
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-crop #{dimensions}+0+0
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-unsharp 2x0.5+0.7+0
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-interlace none
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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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ensure_safe_paths!(from, to)
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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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ensure_safe_paths!(from, to)
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%W{
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convert
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#{from}[0]
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-auto-orient
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-gravity center
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-background transparent
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-interlace none
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-resize #{dimensions}
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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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begin
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Discourse::Utils.execute_command(*instructions)
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rescue
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return false
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end
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FileHelper.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 = nil)
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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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scope = OptimizedImage.includes(:upload)
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.where("url NOT LIKE '%/optimized/_X/%'")
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.order(id: :desc)
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scope.limit(limit) if limit
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scope.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(
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url,
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max_file_size: max_file_size_kb,
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tmp_file_name: "discourse",
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follow_redirect: true
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) 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 = Upload.generate_digest(path)
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end
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# optimize if image
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FileHelper.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)
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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&.unlink
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file&.close
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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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