fix(aes-encryption): support plain txt and url safe base64 strings

[ivankatliarchuk]

Description

Fixes #4975
Fixes #3992

The primary change in behavior is that the service will now successfully start when an AES key is provided as outlined in the documentation (text or base64 form). The core business logic related to encryption remains unchanged.

• added tests to cover missing branches for endpoint.{labels,crypto}
• added tests to cover logic when AES keys is base64 form
• added tests to cover current label encryption logic for records
• updated/rephrased documentation

While was working on a fix, found a bug, where Dynamodb not encrypting labels

external-dns/registry/dynamodb.go

Line 239 in e964a66

statements = im.appendInsert(statements, key, r.Labels)

Trying to keep the scope of this pull request small. And could tweak DynamoDB encryption in follow up if required.

When TXT registry behaves correctly

external-dns/registry/txt.go

Line 270 in e964a66

filteredChanges.Delete = append(filteredChanges.Delete, im.generateTXTRecord(r)...)

Look's like the feature is not in use as was not able to find a single issue to date

Added tests

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

Hi @ivankatliarchuk. Thanks for your PR.

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[mloiseleur]

/ok-to-test

[mloiseleur]

A related issue is declared in #3992
There was also a PR, but it did not manage to get merged, see #4063

If I follow correctly this PR, there is no migration needed, not like with #4063.

/lgtm
/assign @Raffo

[ivankatliarchuk]

I'm blind. Could just refresh a PR 😄😄😄. But at least now I'm a bit familiar with the code behind it

[mloiseleur]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mloiseleur

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