[PR] Fix ModelEncryptionSupport serialization/deserialization bugs [cxf]

["gnodet (via GitHub)" <gi...@apache.org>]

gnodet opened a new pull request, #2953:
URL: https://github.com/apache/cxf/pull/2953

   ## Summary
   
   Fixes two bugs in `ModelEncryptionSupport` that made `DefaultEncryptingOAuthDataProvider` practically unusable:
   
   1. **Null values serialized as spaces**: `tokenizeString(null)` returned `" "` (space), so `new Client("clientId", null, false)` would deserialize with `clientSecret = " "` instead of `null`
   2. **Collections serialized with brackets and spaces**: Using `List.toString()` produced `[openid, email]`, and `parseSimpleList` would strip the brackets but leave spaces, resulting in `" email"` instead of `"email"`
   
   ### Changes
   
   - `tokenizeString`: returns `""` instead of `" "` for null
   - `getStringPart`: checks for `""` instead of `" "` 
   - New `tokenizeCollection`/`tokenizeMap` helpers replace direct `.toString()` calls
   - `parseSimpleList`/`parseSimpleMap`: simplified to work with comma-separated values without brackets
   - All `split()` calls use `-1` limit to preserve trailing empty strings
   - `parseSimpleMap`: added empty check to avoid NPE on empty strings
   - Applied `getStringPart` to client id/secret in `recreateClientInternal`
   
   Supersedes #816. A JIRA ticket should be created for this fix.
   
   ## Test plan
   
   - [x] Added `testPublicClient` test — verifies null secret round-trips correctly
   - [x] All existing `CryptoUtilsTest` tests pass
   - [ ] CI verification
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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Re: [PR] Fix ModelEncryptionSupport serialization/deserialization bugs [cxf]

["gnodet (via GitHub)" <gi...@apache.org>]

gnodet commented on PR #2953:
URL: https://github.com/apache/cxf/pull/2953#issuecomment-4046020203

   CI failures are unrelated flaky OAuth2 systest failures (AuthorizationGrantTest, PublicClientTest — port/server startup issues). Re-triggering.


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