feat(experimentalIdentityAndAuth): update HttpAuthScheme and IdentityProviderConfig interfaces

Update `HttpAuthScheme` to use `IdentityProviderConfig` as an
abstraction over a client's configuration.

Author: Steven Yuan

.changeset/grumpy-turtles-sing.md

@@ -0,0 +1,5 @@
+---
+"@smithy/experimental-identity-and-auth": patch
+---
+
+INTERNAL USE ONLY: Update `HttpAuthScheme` and `IdentityProviderConfig` interfaces

packages/experimental-identity-and-auth/src/HttpAuthScheme.ts

@@ -1,6 +1,7 @@
 import { Identity, IdentityProvider } from "@smithy/types";
 
 import { HttpSigner } from "./HttpSigner";
+import { IdentityProviderConfig } from "./IdentityProviderConfig";
 
 /**
  * ID for {@link HttpAuthScheme}
@@ -18,9 +19,9 @@ export interface HttpAuthScheme {
    */
   schemeId: HttpAuthSchemeId;
   /**
-   * IdentityProvider corresponding to an HttpAuthScheme.
+   * Gets the IdentityProvider corresponding to an HttpAuthScheme.
    */
-  identityProvider: IdentityProvider<Identity>;
+  identityProvider(config: IdentityProviderConfig): IdentityProvider<Identity> | undefined;
   /**
    * HttpSigner corresponding to an HttpAuthScheme.
    */

packages/experimental-identity-and-auth/src/IdentityProviderConfig.ts

@@ -0,0 +1,39 @@
+import { Identity, IdentityProvider } from "@smithy/types";
+
+import { HttpAuthSchemeId } from "./HttpAuthScheme";
+
+/**
+ * Interface to get an IdentityProvider for a specified HttpAuthScheme
+ * @internal
+ */
+export interface IdentityProviderConfig {
+  /**
+   * Get the IdentityProvider for a specified HttpAuthScheme.
+   * @param schemeId schemeId of the HttpAuthScheme
+   * @returns IdentityProvider or undefined if HttpAuthScheme is not found
+   */
+  getIdentityProvider(schemeId: HttpAuthSchemeId): IdentityProvider<Identity> | undefined;
+}
+
+/**
+ * Default implementation of IddentityProviderConfig
+ * @internal
+ */
+export class DefaultIdentityProviderConfig implements IdentityProviderConfig {
+  private authSchemes: Map<HttpAuthSchemeId, IdentityProvider<Identity>> = new Map();
+
+  /**
+   * Creates an IdentityProviderConfig with a record of scheme IDs to identity providers.
+   *
+   * @param config scheme IDs and identity providers to configure
+   */
+  constructor(config: Record<HttpAuthSchemeId, IdentityProvider<Identity>>) {
+    for (const [key, value] of Object.entries(config)) {
+      this.authSchemes.set(key, value);
+    }
+  }
+
+  public getIdentityProvider(schemeId: HttpAuthSchemeId): IdentityProvider<Identity> | undefined {
+    return this.authSchemes.get(schemeId);
+  }
+}

packages/experimental-identity-and-auth/src/IdentityProviderConfiguration.ts

@@ -1,6 +1,6 @@
-export * from "./IdentityProviderConfiguration";
 export * from "./HttpAuthScheme";
 export * from "./HttpSigner";
+export * from "./IdentityProviderConfig";
 export * from "./SigV4Signer";
 export * from "./apiKeyIdentity";
 export * from "./httpApiKeyAuth";