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[okhttp-gson] Add support for OAuth access token retry

Merged Administrator requested to merge github/fork/Kiran-Sivakumar/retry into master

Created by: Kiran-Sivakumar

PR checklist

  • Read the contribution guidelines.
  • Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
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Description of the PR

@bbdouglas @JFCote @sreeshas @jfiala @lukoyanov @cbornet @jeff9finger This adds support for OAuth access token retry logic to the OkHttp-gson Java library.

This implements a similar solution to the one used in the retrofit library: https://github.com/OpenAPITools/openapi-generator/commit/69d956f16b6c18d6282b5bd0d408505cf1adb56a.

Changes:

  • ApiClient.mustache
    • ApiClient constructor added to allow for necessary access token retry information to be initialized (if user wants token retry support). This constructor is only generated if OAuth is being used.
    • Added getter for token end point (TokenRequestBuilder).
  • OAuthOkHttpClient class generated under auth/ to perform access token retry requests.
  • RetryingOAuth class generated under auth/ to perform access token retry logic; implements the okhttp Interceptor interface (clean and modular).
  • Dependencies added for maven and gradle.
  • Samples updated.

fix https://github.com/OpenAPITools/openapi-generator/issues/1057