discourse/app/controllers/uploads_controller.rb

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# frozen_string_literal: true
require "mini_mime"
require_dependency 'upload_creator'
require_dependency "file_store/local_store"
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class UploadsController < ApplicationController
requires_login except: [:show, :show_short]
skip_before_action :preload_json, :check_xhr, :redirect_to_login_if_required, only: [:show, :show_short]
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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.sso_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"
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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,
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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
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end
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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?
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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 Discourse.store.internal?
send_file_local_upload(upload)
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else
redirect_to Discourse.store.url_for(upload, force_download: params[:dl] == "1")
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end
else
render_404
end
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 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
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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,
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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 params[:inline]
opts[:disposition] = "inline"
elsif !FileHelper.is_supported_image?(upload.original_filename)
opts[:disposition] = "attachment"
end
file_path = Discourse.store.path_for(upload)
return render_404 unless file_path
send_file(file_path, opts)
end
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end