Add getOAuthApi method

[DeanMauro]

This PR makes OAuthHelpers available outside of the fetch method (i.e. in a worker's RPC methods) via the getOAuthApi function.

Problem

this.env.OAUTH_PROVIDER gets populated in OAuthProviderImpl.fetch(), so if we try to use it in a worker's RPC methods, for example, it will always be undefined.

const providerOptions = {...};

// Create the OAuth provider instance
const oauthProvider = new OAuthProvider(providerOptions);

export default class extends WorkerEntrypoint<AuthWorkerEnv> {
  async fetch(request: Request) {...}

  async checkClient(id: string) {
    // ERROR because this.env.OAUTH_PROVIDER isn't set yet
    const existingClient = await this.env.OAUTH_PROVIDER.lookupClient(id);

    // SUCCESS
    const existingClient = await getOAuthApi(providerOptions, this.env).lookupClient(id);
  }
}

Solution

We add a method getOAuthApi(options: OAuthProviderOptions, env: any) that initializes and retrieves OAuthHelpers directly.

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Latest commit: a210ce5

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[DeanMauro]

@mattzcarey - Can you give this a review?

@kentonv - Found a neat way to add methods to the provider without exposing them over RPC

[DeanMauro]

@kentonv Updated with requested changes.
cc @mattzcarey