feat(logging): add isLoggable util

packages/logging/src/providers/cloudwatch/utils/isLoggable.ts

@@ -0,0 +1,55 @@
+// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+// SPDX-License-Identifier: Apache-2.0
+
+import { fetchAuthSession } from '@aws-amplify/core';
+
+export const isLoggable = async (
+	cloudWatchConfig: CloudWatchConfig,
+): Promise<LogLevel> => {
+	const { loggingConstraints } = cloudWatchConfig;
+	const { defaultLogLevel, categoryLogLevel } =
+		await getLoggingConstraint(loggingConstraints);
+
+	let resolvedCategoryLogLevel;
+	if (!!categoryLogLevel) {
+		resolvedCategoryLogLevel = getCategoryLogLevel(log, categoryLogLevel);
+	}
+
+	return resolvedCategoryLogLevel ?? defaultLogLevel;
+};
+
+const getLoggingConstraint = async (
+	loggingConstraints: LoggingConstraints,
+): Promise<LoggingConstraint> => {
+	const { defaultLogLevel, categoryLogLevel, userLogLevel } =
+		loggingConstraints;
+
+	// const { userSub } = await fetchAuthSession();
+	const userSub = 'userSub1';
+
+	if (!!userLogLevel?.[userSub]) {
+		return {
+			defaultLogLevel: userLogLevel[userSub].defaultLogLevel,
+			categoryLogLevel: userLogLevel[userSub]?.categoryLogLevel,
+		};
+	}
+
+	return {
+		defaultLogLevel,
+		categoryLogLevel,
+	};
+};
+
+const getCategoryLogLevel = (
+	log: LogParams,
+	categoryLogLevel: CategoryLogLevel,
+): LogLevel | undefined => {
+	if (!log.category) {
+		return undefined;
+	}
+
+	const matchedKey = Object.keys(categoryLogLevel).find(
+		key => key.toLowerCase() === log.category.toLowerCase(),
+	);
+	return matchedKey ? categoryLogLevel[matchedKey] : undefined;
+};