Merge pull request #1 from andrewlimcj/feature/cloud-aws-s3

Add feature toggle implementation for AWS S3

.gitignore

@@ -102,3 +102,6 @@ dist
 
 # TernJS port file
 .tern-port
+
+# MacOS
+.DS_Store

index.js

@@ -0,0 +1,64 @@
+const AWS = require('aws-sdk');
+const s3 = new AWS.S3();
+
+const CONSOLE_LOG_PREFIX = '[cloud-feature-toggles]'
+
+module.exports = (options) => {
+    init(options);
+
+    isEnabled = async (featureToggle) => {
+        if (options.aws.s3) {
+            try {
+                const featureToggleConfig = await getObjectS3(options.aws.s3.bucket, featureToggle);
+
+                return featureToggleConfig.isEnabled;
+            } catch(err) {
+                console.warn(`${CONSOLE_LOG_PREFIX} Error in retrieving config from AWS S3 - ` + err);
+                console.warn(`${CONSOLE_LOG_PREFIX} Default to return false`);
+
+                return false;
+            }
+        }
+
+        return false;
+    };
+
+    return {
+        isEnabled
+    };
+}
+
+const init = (options) => {
+    if (typeof options === 'undefined' || options === null) {
+        throw new Error('Missing options parameter');
+    }
+
+    if (!Object.keys(options).length) {
+        throw new Error('Missing configuration in options parameter');
+    }
+
+    if (options.aws) {
+        if (!options.aws.region || options.aws.region === null) {
+            throw new Error('Missing region in AWS configuration');
+        } 
+
+        AWS.config.update({ region: options.aws.region });
+    }
+}
+
+const getObjectS3 = (bucket, key) => {
+    return new Promise((resolve, reject) => {
+        const params = {
+            Bucket: bucket,
+            Key: key
+        };
+
+        s3.getObject(params, (err, data) => {
+            if (err) {
+                reject(new Error(err.message));
+            } else {
+                resolve(JSON.parse(data.Body.toString('utf-8')));
+            }
+        });
+    });
+}

package.json

@@ -8,12 +8,24 @@
   },
   "repository": {
     "type": "git",
-    "url": "git+https://github.com/andrewlimcj/cloud-feature-toggles.git"
+    "url": "git+https://github.com/andrewlimcj/cloud-feature-toggles"
   },
+  "keywords": [
+    "cloud", 
+    "feature", 
+    "toggles", 
+    "toggle", 
+    "feature toggle", 
+    "feature toggles", 
+    "AWS"
+  ],
   "author": "andrewlimcj",
   "license": "MIT",
   "bugs": {
     "url": "https://github.com/andrewlimcj/cloud-feature-toggles/issues"
   },
-  "homepage": "https://github.com/andrewlimcj/cloud-feature-toggles#readme"
+  "homepage": "https://github.com/andrewlimcj/cloud-feature-toggles#readme",
+  "dependencies": {
+    "aws-sdk": "^2.644.0"
+  }
 }