discourse/app/models/upload.rb

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require 'digest/sha1'
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require 'image_sizer'
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require 'tempfile'
require 'pathname'
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class Upload < ActiveRecord::Base
belongs_to :user
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has_many :post_uploads
has_many :posts, through: :post_uploads
has_many :optimized_images, dependent: :destroy
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validates_presence_of :filesize
validates_presence_of :original_filename
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def thumbnail
optimized_images.where(width: width, height: height).first
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end
def has_thumbnail?
thumbnail.present?
end
def create_thumbnail!
return unless SiteSetting.create_thumbnails?
return if has_thumbnail?
thumbnail = OptimizedImage.create_for(self, width, height)
optimized_images << thumbnail if thumbnail
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end
def destroy
Upload.transaction do
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Discourse.store.remove_upload(self)
super
end
end
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def extension
File.extname(original_filename)
end
def self.create_for(user_id, file, filesize)
# compute the sha
sha1 = Digest::SHA1.file(file.tempfile).hexdigest
# check if the file has already been uploaded
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unless upload = Upload.where(sha1: sha1).first
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# deal with width & heights for images
if SiteSetting.authorized_image?(file)
# retrieve image info
image_info = FastImage.new(file.tempfile, raise_on_failure: true)
# compute image aspect ratio
width, height = ImageSizer.resize(*image_info.size)
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# make sure we're at the beginning of the file (FastImage is moving the pointer)
file.rewind
end
# create a db record (so we can use the id)
upload = Upload.create!(
user_id: user_id,
original_filename: file.original_filename,
filesize: filesize,
sha1: sha1,
url: "",
width: width,
height: height,
)
# store the file and update its url
upload.url = Discourse.store.store_upload(file, upload)
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# save the url
upload.save
end
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# return the uploaded file
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upload
end
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def self.get_from_url(url)
# we store relative urls, so we need to remove any host/cdn
asset_host = Rails.configuration.action_controller.asset_host
url = url.gsub(/^#{asset_host}/i, "") if asset_host.present?
Upload.where(url: url).first if Discourse.store.has_been_uploaded?(url)
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end
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end
# == Schema Information
#
# Table name: uploads
#
# id :integer not null, primary key
# user_id :integer not null
# original_filename :string(255) not null
# filesize :integer not null
# width :integer
# height :integer
# url :string(255) not null
# created_at :datetime not null
# updated_at :datetime not null
# sha1 :string(40)
#
# Indexes
#
# index_uploads_on_sha1 (sha1) UNIQUE
# index_uploads_on_url (url)
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# index_uploads_on_user_id (user_id)
#
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