Refactor OidcTokenProvider to remove dependency on IdentityModel and improve token handling #1618
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…improve token handling
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The constructor `OidcTokenProvider` now always sets the `_expiry` field by calling `GetExpiryFromToken()`, regardless of whether `_idToken` is null or empty, removing the previous check for a non-empty `_idToken`. The `GetExpiryFromToken` method has been updated to handle invalid JWT token formats more gracefully. Instead of throwing an `ArgumentException` when the token format is invalid or when the 'exp' claim is missing, the method now returns a default value. The logic for parsing the JWT token and extracting the 'exp' claim has been wrapped in a try-catch block. If any exception occurs during this process, it is caught, and the method returns a default value instead of throwing an exception.
Moved the initialization of the `parts` variable, which splits the `_idToken` string, inside the `try` block. Removed the previous check for exactly three elements in the `parts` array and the default return value if the check failed.
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#1617