feat: show error Toastr for intranet users on SPCP forms

[mantariksh]

Problem

SingPass/CorpPass do not work on the intranet due to an issue with SIS cookies, but nothing in the UI alerts users to this. When they attempt to log in to SingPass/CorpPass, everything seems to be successful, but when they are redirected back to the form, they are not logged in.

Solution

Show a permanent Toastr when users access a SPCP/MyInfo form from the intranet.

Detection of requests from the intranet was implemented by reading in a list of intranet IPs from a static file, which must be transferred into the server.

In addition, the opportunity was taken to log intranet usage for analytics purposes.

Other changes

In the createReqMeta utility function, we use the req.url property to log the URL of the request. However, this does not work well with Express Router, as only the path after the router is logged. This is why e.g. for handleEmailSubmission, meta.url in our logs looks like this:

/5e3ebefa5203c3001108b7ba?captchaResponse=...

Notice that the /v2/submissions/email prefix is missing.

Hence this was changed to use req.baseUrl + req.path, and req.originalUrl was added to capture any query parameters.

Screenshots

Tests

• List of intranet IPs has been SFTPed into production, and INTRANET_IP_LIST_PATH env var has been added in production
• SingPass, CorpPass and MyInfo forms on intranet show the error Toastr
• Non-authenticated forms on intranet do not show the error Toastr
• SingPass, CorpPass, MyInfo and non-authenticated forms on internet do not show the error Toastr

[karrui]

lgtm