overleaf/services/web/app/coffee/Features/LinkedFiles/UrlAgent.coffee
2018-03-05 10:37:53 +00:00

68 lines
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2.1 KiB
CoffeeScript

request = require 'request'
FileWriter = require('../../infrastructure/FileWriter')
_ = require "underscore"
urlValidator = require 'valid-url'
Settings = require 'settings-sharelatex'
UrlFetchFailedError = (message) ->
error = new Error(message)
error.name = 'UrlFetchFailedError'
error.__proto__ = UrlFetchFailedError.prototype
return error
UrlFetchFailedError.prototype.__proto__ = Error.prototype
InvalidUrlError = (message) ->
error = new Error(message)
error.name = 'InvalidUrlError'
error.__proto__ = InvalidUrlError.prototype
return error
InvalidUrlError.prototype.__proto__ = Error.prototype
module.exports = UrlAgent = {
UrlFetchFailedError: UrlFetchFailedError
InvalidUrlError: InvalidUrlError
sanitizeData: (data) ->
return {
url: @._prependHttpIfNeeded(data.url)
}
writeIncomingFileToDisk: (project_id, data, current_user_id, callback = (error, fsPath) ->) ->
callback = _.once(callback)
url = data.url
if !urlValidator.isWebUri(url)
return callback(new InvalidUrlError("invalid url: #{url}"))
url = UrlAgent._wrapWithProxy(url)
readStream = request.get(url)
readStream.on "error", callback
readStream.on "response", (response) ->
if 200 <= response.statusCode < 300
FileWriter.writeStreamToDisk project_id, readStream, callback
else
error = new UrlFetchFailedError("url fetch failed: #{url}")
error.statusCode = response.statusCode
callback(error)
handleError: (error, req, res, next) ->
if error instanceof UrlFetchFailedError
res.status(422).send(
"Your URL could not be reached (#{error.statusCode} status code). Please check it and try again."
)
else if error instanceof InvalidUrlError
res.status(422).send(
"Your URL is not valid. Please check it and try again."
)
else
next(error)
_prependHttpIfNeeded: (url) ->
if !url.match('://')
url = 'http://' + url
return url
_wrapWithProxy: (url) ->
# TODO: Consider what to do for Community and Enterprise edition?
if !Settings.apis?.linkedUrlProxy?.url?
throw new Error('no linked url proxy configured')
return "#{Settings.apis.linkedUrlProxy.url}?url=#{encodeURIComponent(url)}"
}