Hash token guard credentials during validation

[Nipun404]

Problem

TokenGuard::validate does not respect hashed token configuration (hash => true), leading to inconsistent behavior compared to TokenGuard::user.

Currently:

Auth::guard('api')->user(); 
Auth::guard('api')->validate(['api_token' => 'plain-token']);

• user() → hashes the incoming token before lookup
• validate() → passes the raw token directly

For applications storing API tokens as SHA-256 hashes, this can cause validate to return false even when the provided plain token is valid.

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Solution

This change updates TokenGuard::validate to hash the provided credential when the guard is configured with hash => true, aligning its behavior with TokenGuard::user.

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Benefit to Users

• Ensures consistent behavior between user() and validate()
• Allows applications using hashed API tokens to validate credentials correctly
• Improves reliability for apps that avoid storing raw API tokens for security reasons

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Backward Compatibility

This change does not introduce breaking behavior:

• When hash => false (default), behavior remains unchanged
• The new behavior only applies when hash => true, where hashing is already expected and used in TokenGuard::user

This ensures existing applications relying on raw tokens continue to function as before.

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Tests

• Added unit test to ensure validate hashes credentials when hash => true
• Added integration test to verify full authentication flow with hashed API tokens

These tests confirm:

• Plain tokens are correctly validated when stored as hashes
• Behavior matches TokenGuard::user
• No regression when hash => false

The integration test ensures the complete authentication pipeline works correctly.

=>This pull request is a follow-up to a previously closed PR with the same change, updated to include a more detailed explanation and additional test coverage (including integration test).

[Nipun404]

Hey , @taylorotwell could you share the reasoning behind closing this? Would love to understand so I can improve the contribution. Thanks!