add resolveConfig + resolveCredentials + error utils

packages/api-graphql/src/utils/errors/APIError.ts

@@ -0,0 +1,18 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { AmplifyError, ErrorParams } from '@aws-amplify/core/internals/utils';
+
+/**
+ * @internal
+ */
+export class APIError extends AmplifyError {
+	constructor(params: ErrorParams) {
+		super(params);
+
+		// Hack for making the custom error class work when transpiled to es5
+		// TODO: Delete the following 2 lines after we change the build target to >= es2015
+		this.constructor = APIError;
+		Object.setPrototypeOf(this, APIError.prototype);
+	}
+}

packages/api-graphql/src/utils/errors/assertValidationError.ts

@@ -0,0 +1,19 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { APIError } from './APIError';
+import { APIValidationErrorCode, validationErrorMap } from './validation';
+
+/**
+ * @internal
+ */
+export function assertValidationError(
+	assertion: boolean,
+	name: APIValidationErrorCode
+): asserts assertion {
+	const { message, recoverySuggestion } = validationErrorMap[name];
+
+	if (!assertion) {
+		throw new APIError({ name, message, recoverySuggestion });
+	}
+}

packages/api-graphql/src/utils/errors/index.ts

@@ -0,0 +1,6 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+export { APIError } from './APIError';
+export { assertValidationError } from './assertValidationError';
+export { APIValidationErrorCode, validationErrorMap } from './validation';

packages/api-graphql/src/utils/errors/validation.ts

@@ -0,0 +1,23 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { AmplifyErrorMap } from '@aws-amplify/core/internals/utils';
+
+// TODO V6 - include all errors:
+export enum APIValidationErrorCode {
+	NoAppId = 'NoAppId',
+	NoCredentials = 'NoCredentials',
+	NoRegion = 'NoRegion',
+}
+
+export const validationErrorMap: AmplifyErrorMap<APIValidationErrorCode> = {
+	[APIValidationErrorCode.NoAppId]: {
+		message: 'Missing application id.',
+	},
+	[APIValidationErrorCode.NoCredentials]: {
+		message: 'Credentials should not be empty.',
+	},
+	[APIValidationErrorCode.NoRegion]: {
+		message: 'Missing region.',
+	},
+};

packages/api-graphql/src/utils/index.ts

@@ -0,0 +1,5 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+export { resolveConfig } from './resolveConfig';
+export { resolveCredentials } from './resolveCredentials';

packages/api-graphql/src/utils/resolveConfig.ts

@@ -0,0 +1,17 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { Amplify } from '@aws-amplify/core';
+import { APIValidationErrorCode, assertValidationError } from './errors';
+
+/**
+ * @internal
+ */
+export const resolveConfig = () => {
+	// TODO V6
+	const { appId, region } = Amplify.getConfig().API ?? {};
+	assertValidationError(!!appId, APIValidationErrorCode.NoAppId);
+	assertValidationError(!!region, APIValidationErrorCode.NoRegion);
+	// TODO V6
+	return { appId, region };
+};

packages/api-graphql/src/utils/resolveCredentials.ts

@@ -0,0 +1,14 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { fetchAuthSession } from '@aws-amplify/core';
+import { APIValidationErrorCode, assertValidationError } from './errors';
+
+/**
+ * @internal
+ */
+export const resolveCredentials = async () => {
+	const { credentials, identityId } = await fetchAuthSession();
+	assertValidationError(!!credentials, APIValidationErrorCode.NoCredentials);
+	return { credentials, identityId };
+};