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yup-oauth2 is a utility library which implements several OAuth 2.0 flows. It's mainly used by google-apis-rs, to authenticate against Google services. (However, you're able to use it with raw HTTP requests as well; the flows are implemented as token sources yielding HTTP Bearer tokens). Note that the newer, asynchronous versions of this crate (version 4) are not compatible with google-apis-rs anymore/at the moment.

To use asynchronous APIs with the new yup-oauth2 (from version 4), use the async-google-apis code generator, which generates asynchronous API stubs for Google APIs and other providers who provide Discovery documents for their REST APIs. (WARNING: that project is still alpha-quality. Contributions are welcome)

The provider we have been testing the code against is also Google. However, the code itself is generic, and any OAuth provider behaving like Google will work as well. If you find one that doesn't, please let us know and/or contribute a fix!

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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.