[ELYWEB-180] Elytron web consumes the InputStream when form parameters are parsed

[darranl]

Supercedes #213

Issue: https://issues.redhat.com/browse/ELYWEB-180

Wrapping the HttpServletRequest to replay the request for the app. Main ideas:

• Wrapping is the only way of doing this cos undertow avoids using InputStream and parameters for the same request on purpose (both getInputStream and parameters are setting readStarted to true and avoiding each other).

• The wrapping is only done if the size of the request is below undertow MAX_BUFFERED_REQUEST_SIZE limit to avoid saving big chunks of data.

• Only query parameters are managed in any other case.

• Adding a new test and other classes for the change. Project httpmime was added to the pom (test scope) in order to test multi-part requests.

• The elytron-web, wilfly-core and wildfly TS run OK with the change.

[darranl]

This ports the changes from the original proposal against 1.x to the 4.x branch.

However this does fail testing for new SSO tests so something else may be required to complete porting this.

[darranl]

@rmartinc I am still thinking about this change, is there nothing that we can do using Undertow APIs to get undertow to handle this for us?

As an example InputStreams have mark and reset APIs is there no way we can delegate this to Undertow to manage?

[rmartinc]

Hi @darranl! I'm not involved with undertow lately and this issue is very old 😄. @fl4via would be your contact now.

[darranl]

Thank you @rmartinc I will code this for now and make sure we have a link in the Jira issue for someone else to follow up.