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https://issues.apache.org/jira/browse/CAMEL-20503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-20503.
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Resolution: Fixed
> camel-http OAuth2 support for caching / refreshing tokens
> ---------------------------------------------------------
>
> Key: CAMEL-20503
> URL: https://issues.apache.org/jira/browse/CAMEL-20503
> Project: Camel
> Issue Type: New Feature
> Components: camel-http
> Affects Versions: 4.4.0
> Reporter: Joshua Grisham
> Assignee: Ivan Kulaga
> Priority: Major
> Fix For: 4.9.0
>
>
> Currently the OAuth2 support in camel-http will retrieve a new token with
> every single HTTP Request
> It is typically a more preferred pattern to actually cache the access tokens
> (per the same issuer, + for the same client_id + the same requested scopes)
> as fetching tokens can be an expensive operation, plus that access tokens can
> often have a relatively long expiration time which Camel could actually take
> advantage of.
> Some examples:
> * Google's
> [OAuth2Credentials|https://cloud.google.com/java/docs/reference/google-auth-library/latest/com.google.auth.oauth2.OAuth2Credentials]
> class supports token caching and refresh (see:
> [https://github.com/googleapis/google-auth-library-java/blob/main/oauth2_http/java/com/google/auth/oauth2/OAuth2Credentials.java])
> * Spring Security's OAuth2 client also does this "under the covers" (though
> is a bit more complicated):
> [https://github.com/spring-projects/spring-security/tree/main/oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client]
> The assumption is that users might want to be able to configure the behavior
> of this somehow, so maybe it would be good to add some additional properties
> to control if a cache is used at all and/or how "early" tokens should be
> refreshed before their expiration time, if the token refresh mechanism should
> be used instead of just requesting a totally new access token from scratch,
> etc
> It may also be worth to break this effort into smaller deliveries:
> * first to add a token cache and then request new tokens only when old ones
> are expired (depending on various config parameters)
> * second to add a refresh mechanism to actually use the OAuth2 Refresh flow
> instead of just fetching a totally new Access Token (with all appropriate
> checks that a refresh token was actually given by the token provider from the
> beginning etc...) see:
> [https://datatracker.ietf.org/doc/html/rfc6749#section-1.5] and
> [https://datatracker.ietf.org/doc/html/rfc6749#section-6]
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