discourse/app/models/upload.rb

123 lines
3.4 KiB
Ruby

require "digest/sha1"
require "image_sizer"
class Upload < ActiveRecord::Base
belongs_to :user
has_many :post_uploads, dependent: :destroy
has_many :posts, through: :post_uploads
has_many :optimized_images, dependent: :destroy
validates_presence_of :filesize
validates_presence_of :original_filename
def thumbnail(width = self.width, height = self.height)
optimized_images.where(width: width, height: height).first
end
def has_thumbnail?(width, height)
thumbnail(width, height).present?
end
def create_thumbnail!(width, height)
return unless SiteSetting.create_thumbnails?
thumbnail = OptimizedImage.create_for(self, width, height)
if thumbnail
optimized_images << thumbnail
self.width = width
self.height = height
save!
end
end
def destroy
Upload.transaction do
Discourse.store.remove_upload(self)
super
end
end
def extension
File.extname(original_filename)
end
def self.create_for(user_id, file, filesize, origin = nil)
# compute the sha
sha1 = Digest::SHA1.file(file.tempfile).hexdigest
# check if the file has already been uploaded
upload = Upload.where(sha1: sha1).first
# delete the previously uploaded file if there's been an error
if upload && upload.url.blank?
upload.destroy
upload = nil
end
# create the upload
unless upload
# deal with width & height 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)
# make sure we're at the beginning of the file (FastImage is moving the pointer)
file.rewind
end
# trim the origin if any
origin = origin[0...1000] if origin
# 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,
origin: origin,
)
# store the file and update its url
url = Discourse.store.store_upload(file, upload)
if url.present?
upload.url = url
upload.save
else
Rails.logger.error("Failed to store upload ##{upload.id} for user ##{user_id}")
end
end
# return the uploaded file
upload
end
def self.get_from_url(url)
# we store relative urls, so we need to remove any host/cdn
url = url.gsub(/^#{Discourse.asset_host}/i, "") if Discourse.asset_host.present?
Upload.where(url: url).first if Discourse.store.has_been_uploaded?(url)
end
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_id_and_url (id,url)
# index_uploads_on_sha1 (sha1) UNIQUE
# index_uploads_on_url (url)
# index_uploads_on_user_id (user_id)
#