discourse/app/models/upload.rb

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require "digest/sha1"
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require_dependency "file_helper"
require_dependency "url_helper"
require_dependency "db_helper"
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require_dependency "validators/upload_validator"
require_dependency "file_store/local_store"
require_dependency "base62"
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class Upload < ActiveRecord::Base
belongs_to :user
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has_many :post_uploads, dependent: :destroy
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has_many :posts, through: :post_uploads
has_many :optimized_images, dependent: :destroy
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attr_accessor :for_group_message
attr_accessor :for_theme
attr_accessor :for_private_message
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validates_presence_of :filesize
validates_presence_of :original_filename
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validates_with ::Validators::UploadValidator
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def thumbnail(width = self.width, height = self.height)
optimized_images.find_by(width: width, height: height)
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end
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def has_thumbnail?(width, height)
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thumbnail(width, height).present?
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end
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def create_thumbnail!(width, height, crop = false)
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return unless SiteSetting.create_thumbnails?
opts = {
filename: self.original_filename,
allow_animation: SiteSetting.allow_animated_thumbnails,
crop: crop
}
if _thumbnail = OptimizedImage.create_for(self, width, height, opts)
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self.width = width
self.height = height
save(validate: false)
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end
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end
def destroy
Upload.transaction do
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Discourse.store.remove_upload(self)
super
end
end
def short_url
"upload://#{Base62.encode(sha1.hex)}.#{extension}"
end
def self.sha1_from_short_url(url)
if url =~ /(upload:\/\/)?([a-zA-Z0-9]+)(\..*)?/
sha1 = Base62.decode($2).to_s(16)
if sha1.length > 40
nil
else
sha1.rjust(40, '0')
end
end
end
def self.generate_digest(path)
Digest::SHA1.file(path).hexdigest
end
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def self.get_from_url(url)
return if url.blank?
# we store relative urls, so we need to remove any host/cdn
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url = url.sub(Discourse.asset_host, "") if Discourse.asset_host.present?
# when using s3, we need to replace with the absolute base url
url = url.sub(SiteSetting.Upload.s3_cdn_url, Discourse.store.absolute_base_url) if SiteSetting.Upload.s3_cdn_url.present?
# always try to get the path
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uri = URI(url) rescue nil
url = uri.path if uri.try(:scheme)
Upload.find_by(url: url)
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end
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def self.migrate_to_new_scheme(limit = nil)
problems = []
if SiteSetting.migrate_to_new_scheme
max_file_size_kb = [SiteSetting.max_image_size_kb, SiteSetting.max_attachment_size_kb].max.kilobytes
local_store = FileStore::LocalStore.new
scope = Upload.where("url NOT LIKE '%/original/_X/%'").order(id: :desc)
scope.limit(limit) if limit
scope.each do |upload|
begin
# keep track of the url
previous_url = upload.url.dup
# where is the file currently stored?
external = previous_url =~ /^\/\//
# download if external
if external
url = SiteSetting.scheme + ":" + previous_url
file = FileHelper.download(
url,
max_file_size: max_file_size_kb,
tmp_file_name: "discourse",
follow_redirect: true
) rescue nil
path = file.path
else
path = local_store.path_for(upload)
end
# compute SHA if missing
if upload.sha1.blank?
upload.sha1 = Upload.generate_digest(path)
end
# optimize if image
FileHelper.optimize_image!(path) if FileHelper.is_image?(File.basename(path))
# store to new location & update the filesize
File.open(path) do |f|
upload.url = Discourse.store.store_upload(f, upload)
upload.filesize = f.size
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upload.save!
end
# remap the URLs
DbHelper.remap(UrlHelper.absolute(previous_url), upload.url) unless external
DbHelper.remap(previous_url, upload.url)
# remove the old file (when local)
unless external
FileUtils.rm(path, force: true) rescue nil
end
rescue => e
problems << { upload: upload, ex: e }
ensure
file.try(:unlink) rescue nil
file.try(:close) rescue nil
end
end
end
problems
end
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end
# == Schema Information
#
# Table name: uploads
#
# id :integer not null, primary key
# user_id :integer not null
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# original_filename :string(255) not null
# filesize :integer not null
# width :integer
# height :integer
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# url :string(255) not null
# created_at :datetime not null
# updated_at :datetime not null
# sha1 :string(40)
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# origin :string(1000)
# retain_hours :integer
# extension :string(10)
#
# Indexes
#
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# index_uploads_on_extension (lower((extension)::text))
# 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)
#