Fix webhook route fail in argocd due to long route name

[Rizwana777]

What does this PR do / why we need it:
Fix the failing of webhook route in argocd due to long route name

JIRA link:
https://issues.redhat.com/browse/GITOPSRVCE-794

[jgwest]

Looking into this a bit more, hostnames are composed of a set of labels, like:
console-openshift-console.apps.rosa.v8wja-bzjbp-jw8.j2js.p3.openshiftapps.com

with each component part of the hostname being a single label:

• console-openshift-console
• apps
• rosa
• v8wja-bzjbp-jw8
• j2js
• p3
• openshiftapps.com

So the rule appears to be that a hostname cannot be longer than 255 characters, and an individual label (constitute part of a hostname) cannot be longer than 63 characters.
(source)

So I think our shortening algorithm should be:

• If the FIRST label ("console-openshift-console" in the above case) is longer than 63 characters, shorten (truncate the end) it to 63.
• If any other label is longer than 63 characters, return an error
• After all the labels are 63 characters or less, check the length of the overall hostname:
  • If the overall hostname is > 255, then shorten the FIRST label until the host name is < 255
  • After the FIRST label has been shortened, if it is < 20, then return an error (this is a sanity test to ensure the label is likely to be unique)

For example:

For example, this:
myhostnameaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.redhat.com
would become:
myhostnameaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.redhat.com

For example, this:
myhostnametwentysixletteraaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.redhat.com
would become: myhostnametwentysixletteraaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.redhat.com

WDYT?

[jgwest]

Looks like the algorithm as described still needs to be implemented, and the E2E tests are failing.

[Rizwana777]

@jgwest Apologies, I misunderstood the algorithm and now I have updated the logic, please take a look and also I am checking the overall hostname > 253 because entire hostname (including the delimiting dots but not a trailing dot) has a maximum of 253 ASCII characters(https://stackoverflow.com/questions/3523028/valid-characters-of-a-hostname)

[jgwest]

One more tiny request then good to go.

[jgwest]

LGTM, thanks @Rizwana777!

[jaideepr97]

LGTM, thanks @Rizwana777