discourse/app/controllers/uploads_controller.rb

274 lines
8.5 KiB
Ruby

# frozen_string_literal: true
require "mini_mime"
class UploadsController < ApplicationController
requires_login except: [:show, :show_short, :show_secure]
skip_before_action :preload_json, :check_xhr, :redirect_to_login_if_required, only: [:show, :show_short, :show_secure]
protect_from_forgery except: :show
before_action :is_asset_path, :apply_cdn_headers, only: [:show, :show_short, :show_secure]
SECURE_REDIRECT_GRACE_SECONDS = 5
def create
# capture current user for block later on
me = current_user
# 50 characters ought to be enough for the upload type
type = params.require(:type).parameterize(separator: "_")[0..50]
if type == "avatar" && !me.admin? && (SiteSetting.discourse_connect_overrides_avatar || !SiteSetting.allow_uploaded_avatars)
return render json: failed_json, status: 422
end
url = params[:url]
file = params[:file] || params[:files]&.first
pasted = params[:pasted] == "true"
for_private_message = params[:for_private_message] == "true"
for_site_setting = params[:for_site_setting] == "true"
is_api = is_api?
retain_hours = params[:retain_hours].to_i
# note, atm hijack is processed in its own context and has not access to controller
# longer term we may change this
hijack do
begin
info = UploadsController.create_upload(
current_user: me,
file: file,
url: url,
type: type,
for_private_message: for_private_message,
for_site_setting: for_site_setting,
pasted: pasted,
is_api: is_api,
retain_hours: retain_hours
)
rescue => e
render json: failed_json.merge(message: e.message&.split("\n")&.first), status: 422
else
render json: UploadsController.serialize_upload(info), status: Upload === info ? 200 : 422
end
end
end
def lookup_urls
params.permit(short_urls: [])
uploads = []
if (params[:short_urls] && params[:short_urls].length > 0)
PrettyText::Helpers.lookup_upload_urls(params[:short_urls]).each do |short_url, paths|
uploads << {
short_url: short_url,
url: paths[:url],
short_path: paths[:short_path]
}
end
end
render json: uploads.to_json
end
def show
# do not serve uploads requested via XHR to prevent XSS
return xhr_not_allowed if request.xhr?
return render_404 if !RailsMultisite::ConnectionManagement.has_db?(params[:site])
RailsMultisite::ConnectionManagement.with_connection(params[:site]) do |db|
return render_404 if SiteSetting.prevent_anons_from_downloading_files && current_user.nil?
if upload = Upload.find_by(sha1: params[:sha]) || Upload.find_by(id: params[:id], url: request.env["PATH_INFO"])
unless Discourse.store.internal?
local_store = FileStore::LocalStore.new
return render_404 unless local_store.has_been_uploaded?(upload.url)
end
send_file_local_upload(upload)
else
render_404
end
end
end
def show_short
# do not serve uploads requested via XHR to prevent XSS
return xhr_not_allowed if request.xhr?
if SiteSetting.prevent_anons_from_downloading_files && current_user.nil?
return render_404
end
sha1 = Upload.sha1_from_base62_encoded(params[:base62])
if upload = Upload.find_by(sha1: sha1)
if upload.secure? && SiteSetting.secure_media?
return handle_secure_upload_request(upload)
end
if Discourse.store.internal?
send_file_local_upload(upload)
else
redirect_to Discourse.store.url_for(upload, force_download: force_download?)
end
else
render_404
end
end
def show_secure
# do not serve uploads requested via XHR to prevent XSS
return xhr_not_allowed if request.xhr?
return render_404 if !Discourse.store.external?
path_with_ext = "#{params[:path]}.#{params[:extension]}"
sha1 = File.basename(path_with_ext, File.extname(path_with_ext))
# this takes care of optimized image requests
sha1 = sha1.partition("_").first if sha1.include?("_")
upload = Upload.find_by(sha1: sha1)
return render_404 if upload.blank?
return render_404 if SiteSetting.prevent_anons_from_downloading_files && current_user.nil?
return handle_secure_upload_request(upload, path_with_ext) if SiteSetting.secure_media?
# we don't want to 404 here if secure media gets disabled
# because all posts with secure uploads will show broken media
# until rebaked, which could take some time
#
# if the upload is still secure, that means the ACL is probably still
# private, so we don't want to go to the CDN url just yet otherwise we
# will get a 403. if the upload is not secure we assume the ACL is public
signed_secure_url = Discourse.store.signed_url_for_path(path_with_ext)
redirect_to upload.secure? ? signed_secure_url : Discourse.store.cdn_url(upload.url)
end
def handle_secure_upload_request(upload, path_with_ext = nil)
if upload.access_control_post_id.present?
raise Discourse::InvalidAccess if !guardian.can_see?(upload.access_control_post)
else
return render_404 if current_user.nil?
end
# defaults to public: false, so only cached by the client browser
cache_seconds = S3Helper::DOWNLOAD_URL_EXPIRES_AFTER_SECONDS - SECURE_REDIRECT_GRACE_SECONDS
expires_in cache_seconds.seconds
# url_for figures out the full URL, handling multisite DBs,
# and will return a presigned URL for the upload
if path_with_ext.blank?
return redirect_to Discourse.store.url_for(upload, force_download: force_download?)
end
redirect_to Discourse.store.signed_url_for_path(
path_with_ext,
expires_in: S3Helper::DOWNLOAD_URL_EXPIRES_AFTER_SECONDS,
force_download: force_download?
)
end
def metadata
params.require(:url)
upload = Upload.get_from_url(params[:url])
raise Discourse::NotFound unless upload
render json: {
original_filename: upload.original_filename,
width: upload.width,
height: upload.height,
human_filesize: upload.human_filesize
}
end
protected
def force_download?
params[:dl] == "1"
end
def xhr_not_allowed
raise Discourse::InvalidParameters.new("XHR not allowed")
end
def render_404
raise Discourse::NotFound
end
def self.serialize_upload(data)
# as_json.as_json is not a typo... as_json in AM serializer returns keys as symbols, we need them
# as strings here
serialized = UploadSerializer.new(data, root: nil).as_json.as_json if Upload === data
serialized ||= (data || {}).as_json
end
def self.create_upload(current_user:,
file:,
url:,
type:,
for_private_message:,
for_site_setting:,
pasted:,
is_api:,
retain_hours:)
if file.nil?
if url.present? && is_api
maximum_upload_size = [SiteSetting.max_image_size_kb, SiteSetting.max_attachment_size_kb].max.kilobytes
tempfile = FileHelper.download(
url,
follow_redirect: true,
max_file_size: maximum_upload_size,
tmp_file_name: "discourse-upload-#{type}"
) rescue nil
filename = File.basename(URI.parse(url).path)
end
else
tempfile = file.tempfile
filename = file.original_filename
end
return { errors: [I18n.t("upload.file_missing")] } if tempfile.nil?
opts = {
type: type,
for_private_message: for_private_message,
for_site_setting: for_site_setting,
pasted: pasted,
}
upload = UploadCreator.new(tempfile, filename, opts).create_for(current_user.id)
if upload.errors.empty? && current_user.admin?
upload.update_columns(retain_hours: retain_hours) if retain_hours > 0
end
upload.errors.empty? ? upload : { errors: upload.errors.to_hash.values.flatten }
ensure
tempfile&.close!
end
private
def send_file_local_upload(upload)
opts = {
filename: upload.original_filename,
content_type: MiniMime.lookup_by_filename(upload.original_filename)&.content_type
}
if !FileHelper.is_inline_image?(upload.original_filename)
opts[:disposition] = "attachment"
elsif params[:inline]
opts[:disposition] = "inline"
end
file_path = Discourse.store.path_for(upload)
return render_404 unless file_path
send_file(file_path, opts)
end
end