Implemented the client credentials along with the access key credentials

[miazamrai]

Description:

• Implemented the client credentials to get the auth token from Auth0 to make RAI API calls.
• Created a new python file, raiconfig.py. It has a class RAIConfig, which represents the rai configuration, along with the credentials.
• There is a base class, RAICredentials, to represent the generic credentials and two separate classes, AccessKeyCredentials and ClientCredentials to represent the specialized credentials.
• Changed the config.py/read function to try reading both/all the credentials one by one.
• If both/multiple credentials are found, then it will raise an exception.
• Access key credentials are currently for backward compatibility; would be deprecated in future.
• Changed the rest.py/request function to use credentials to create appropriate authorization headers to make the RAI API call
• Implemented a class called ClientCredentialsService, to cache the access token. It contains the access token (client credentials) which it renews only when the access token is empty or expired.

• ClientCredentialsService is part of the Context, so , if the same context is passed to multiple api calls, then all the calls will use the same token.

  TBDs: Do we need two different Context classes?

[larf311]

If both credentials are found, then it will use the access key credentials.

I'd probably throw an exception here. I could see someone banging their head against the wall expecting to use oauth and instead using the access key

[larf311]

Do we need to cache the token so that we don't get a new token each time?

Yes.

[miazamrai]

If both credentials are found, then it will use the access key credentials.

I'd probably throw an exception here. I could see someone banging their head against the wall expecting to use oauth and instead using the access key

If both credentials are found, then it will use the access key credentials.

I'd probably throw an exception here. I could see someone banging their head against the wall expecting to use oauth and instead using the access key

Hehe! Actually, in case of multiple credentials, the caller won't know which credentials have been used, unless they are wrong. There won't be any difference in the output.

Yes, it is a good idea to raise exception if there are multiple credentials in the file. I have updated the read config function to read all the credentials and then raise exception if there are multiple credentials.

[miazamrai]

Do we need to cache the token so that we don't get a new token each time?

Yes.

Done