Rewrite analysis_manager.views.get_full_url() to make it reusable

[hackdna]

This function takes a FileStoreItem instance which leads to code duplication and limited reuse potential. It should take a relative URL instead which would make it usable for creating registration and data set sharing URLs as well.

Options to determine whether http or https URL should be returned:

• https://docs.djangoproject.com/en/1.9/ref/request-response/#django.http.HttpRequest.build_absolute_uri
• https://docs.djangoproject.com/en/1.9/ref/request-response/#django.http.HttpRequest.is_secure
• https://docs.python.org/2/library/wsgiref.html#wsgiref.util.guess_scheme
• http://wsgi.readthedocs.io/en/latest/definitions.html#envvar-wsgi.url_scheme - https://www.python.org/dev/peps/pep-0333/#url-reconstruction
• Django setting (e.g., REFINERY_URL_SCHEME = "https") - https://fragmentsofcode.wordpress.com/2009/02/24/django-fully-qualified-url/
• https://github.com/parklab/refinery-platform/blob/develop/refinery/templates/registration/password_reset_email.html

[scottx611x]

Evaluating options for http or https usage:

These both require an HttpRequest object, whereas we are currently dealing with relative_urls as strings

• https://docs.djangoproject.com/en/1.9/ref/request-response/#django.http.HttpRequest.build_absolute_uri
• https://docs.djangoproject.com/en/1.9/ref/request-response/#django.http.HttpRequest.is_secure

These may be good for the future when a Refinery Instance utilizing HTTPS is available to test them out on

• https://docs.python.org/2/library/wsgiref.html#wsgiref.util.guess_scheme
• http://wsgi.readthedocs.io/en/latest/definitions.html#envvar-wsgi.url_scheme
• https://www.python.org/dev/peps/pep-0333/#url-reconstruction

This way is simple enough and it make it clear as to/easy to find what protocol we are using since this change exists with all of our other settings

• https://fragmentsofcode.wordpress.com/2009/02/24/django-fully-qualified-url/

I've currently implemented the last item in the list to take care of construction of our full urls, but the middle 3 links will help out later on.

Once an instance using HTTPS is available to test on, it looks pretty straightforward to implement some of the more robust solutions.

[scottx611x]

@hackdna Should this be closed for now, and should the suggestions here be implemented in issue: #318 ???

[scottx611x]

This can be closed upon merging: #1092