106 lines
2.9 KiB
Ruby
106 lines
2.9 KiB
Ruby
require "digest/sha1"
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class OptimizedImage < ActiveRecord::Base
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belongs_to :upload
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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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# 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 the previous thumbnail has not failed
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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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# create the thumbnail otherwise
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unless thumbnail
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external_copy = Discourse.store.download(upload) if Discourse.store.external?
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original_path = if Discourse.store.external?
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external_copy.path
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else
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Discourse.store.path_for(upload)
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end
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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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original_path += "[0]" unless opts[:allow_animation]
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if resize(original_path, temp_path, width, height)
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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: File.extname(temp_path),
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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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url = Discourse.store.store_optimized_image(temp_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 avatar #{size} for #{upload.url} from #{source}")
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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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# make sure we remove the cached copy from external stores
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external_copy.close! if Discourse.store.external?
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end
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thumbnail
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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 self.resize(from, to, width, height)
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instructions = %W{
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#{from}
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-gravity center
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-thumbnail #{width}x#{height}^
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-extent #{width}x#{height}
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-background transparent
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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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#{to}
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}.join(" ")
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`convert #{instructions}`
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$?.exitstatus == 0
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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(255) 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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