Create login script to be run before every page test

[lechinoix]

Feature Description

For applications with login, it would be nice to have a script stored in database to be run before each page test.

Use Case

When you have a login page, you need to create one specific script for each page, which is not robust and error prone

[fargito]

We could create a initScript that is a factorization of the login script before authenticated pages. That way, projects would not have to put all their pages in a single script.

For the project, it would be a third type of possible analysis :

• Page
• Script
• AuthenticatedPage

For every AuthenticatedPage, the user should only have to set the url.

When running an audit for an AuthenticatedPage, the initScript should be used but not measured. Then the only measured step should be the navigate https://my-url.com step

The result should then be formatted and presented to the user just as the result of an audit for a page

[fargito]

Backend part

• Create a StartupScript model with a script field and linked with a foreign key to a Project ;
• add a startup_script nullable field on Page ;
• in tasks.py, before launching an audit, check if the page has a startup_script ;
• in this case, append the url of the Page at then end of the startup_script script and set logData 0 before the login part and logData 1 before the navigate http://url
• create a format_wpt_json_results_for_authenticated_page function to transform the results of the audit just as plain page results and save them in the database.

[fargito]

Frontend part

• Add an interface to create startup scripts in the Project Admin (reuse the components to create scripts).
• Provide clean samples of authentication processes ?
• Create a route to get/save/delete startup scripts
• On the create/edit page interface, add a nullable dropdown to choose a startup script linked with the page

[fargito]

Docs

• update docs, and clearly specify the authenticated pages will be run as scripts on Webpagetest, and not as plain pages, even though the results may be presented as those of a page

[lechinoix]

@fargito I'll work on a Pull Request this afternoon