* fix(file import): server port was broken when localhost was canonical url
- use getServerOrigin() instead of directly calling process.env.CANONICAL_URL
- where server is calling itself, use 127.0.0.1 instead of CANONICAL_URL.
- where server is calling itself (i.e. 127.0.0.1, use the server's listening port and not default for protocol http/80, https/443
- tidy some areas where process.env was called directly; should use envHelper.
* fix tests
Iain Sproat
0ec4a87c7c