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
include ActionView::Helpers::NumberHelper
include HasUrl
SHA1_LENGTH = 40
SEEDED_ID_THRESHOLD = 0
URL_REGEX ||= /(\/original\/\dX[\/\.\w]*\/([a-zA-Z0-9]+)[\.\w]*)/
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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
has_many :user_uploads, dependent: :destroy
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attr_accessor :for_group_message
attr_accessor :for_theme
attr_accessor :for_private_message
attr_accessor :for_export
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attr_accessor :for_site_setting
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validates_presence_of :filesize
validates_presence_of :original_filename
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validates_with ::Validators::UploadValidator
after_destroy do
User.where(uploaded_avatar_id: self.id).update_all(uploaded_avatar_id: nil)
UserAvatar.where(gravatar_upload_id: self.id).update_all(gravatar_upload_id: nil)
UserAvatar.where(custom_upload_id: self.id).update_all(custom_upload_id: nil)
end
scope :by_users, -> { where("uploads.id > ?", SEEDED_ID_THRESHOLD) }
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def to_s
self.url
end
def thumbnail(width = self.thumbnail_width, height = self.thumbnail_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
def create_thumbnail!(width, height, opts = nil)
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return unless SiteSetting.create_thumbnails?
opts ||= {}
opts[:allow_animation] = SiteSetting.allow_animated_thumbnails
if get_optimized_image(width, height, opts)
save(validate: false)
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end
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end
# this method attempts to correct old incorrect extensions
def get_optimized_image(width, height, opts)
if (!extension || extension.length == 0)
fix_image_extension
end
opts = opts.merge(raise_on_error: true)
begin
OptimizedImage.create_for(self, width, height, opts)
rescue => ex
Rails.logger.info ex if Rails.env.development?
opts = opts.merge(raise_on_error: false)
if fix_image_extension
OptimizedImage.create_for(self, width, height, opts)
else
nil
end
end
end
def fix_image_extension
return false if extension == "unknown"
begin
# this is relatively cheap once cached
original_path = Discourse.store.path_for(self)
if original_path.blank?
external_copy = Discourse.store.download(self) rescue nil
original_path = external_copy.try(:path)
end
image_info = FastImage.new(original_path) rescue nil
new_extension = image_info&.type&.to_s || "unknown"
if new_extension != self.extension
self.update_columns(extension: new_extension)
true
end
rescue
self.update_columns(extension: "unknown")
true
end
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 local?
!(url =~ /^(https?:)?\/\//)
end
def fix_dimensions!
return if !FileHelper.is_supported_image?("image.#{extension}")
path =
if local?
Discourse.store.path_for(self)
else
Discourse.store.download(self).path
end
begin
w, h = FastImage.new(path, raise_on_failure: true).size
self.width = w || 0
self.height = h || 0
self.thumbnail_width, self.thumbnail_height = ImageSizer.resize(w, h)
self.update_columns(
width: width,
height: height,
thumbnail_width: thumbnail_width,
thumbnail_height: thumbnail_height
)
rescue => e
Discourse.warn_exception(e, message: "Error getting image dimensions")
end
nil
end
# on demand image size calculation, this allows us to null out image sizes
# and still handle as needed
def get_dimension(key)
if v = read_attribute(key)
return v
end
fix_dimensions!
read_attribute(key)
end
def width
get_dimension(:width)
end
def height
get_dimension(:height)
end
def thumbnail_width
get_dimension(:thumbnail_width)
end
def thumbnail_height
get_dimension(:thumbnail_height)
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 > SHA1_LENGTH
nil
else
sha1.rjust(SHA1_LENGTH, '0')
end
end
end
def self.generate_digest(path)
Digest::SHA1.file(path).hexdigest
end
def human_filesize
number_to_human_size(self.filesize)
end
def rebake_posts_on_old_scheme
self.posts.where("cooked LIKE '%/_optimized/%'").find_each(&:rebake!)
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.by_users.where("url NOT LIKE '%/original/_X/%' AND url LIKE '%/uploads/#{RailsMultisite::ConnectionManagement.current_db}%'")
.order(id: :desc)
scope = 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
begin
retries ||= 0
file = FileHelper.download(
url,
max_file_size: max_file_size_kb,
tmp_file_name: "discourse",
follow_redirect: true
)
rescue OpenURI::HTTPError
retry if (retires += 1) < 1
next
end
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
# store to new location & update the filesize
File.open(path) do |f|
upload.url = Discourse.store.store_upload(f, upload)
upload.filesize = f.size
upload.save!(validate: false)
end
# remap the URLs
DbHelper.remap(UrlHelper.absolute(previous_url), upload.url) unless external
DbHelper.remap(previous_url, upload.url)
upload.optimized_images.find_each(&:destroy!)
upload.rebake_posts_on_old_scheme
# remove the old file (when local)
unless external
FileUtils.rm(path, force: true)
end
rescue => e
problems << { upload: upload, ex: e }
ensure
file&.unlink
file&.close
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 not null
# filesize :integer not null
# width :integer
# height :integer
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# url :string 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)
# thumbnail_width :integer
# thumbnail_height :integer
# etag :string
#
# Indexes
#
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# index_uploads_on_etag (etag)
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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)
#