Added the credentials option

README.md

@@ -90,3 +90,18 @@ Allows you to publish a new version when passing in a string for `lambda_params`
 #### `region = 'us-east-1'`
 
 Set your AWS region.
+
+#### `credentials`
+
+Allow to override the AWS object. For example, this could be useful is you need to provide credentials from alternate source.
+
+For example:
+```js
+AWS.config.loadFromPath('../aws.json');
+var awsCredentials = AWS.config.credentials;
+
+var opts = {
+	credentials: awsCredentials;
+};
+```
+The `credentials` parameter will take precedence over the region one.

index.js

@@ -15,6 +15,9 @@ var DEFAULT_PARAMS = {
 	Runtime: 'nodejs4.3'
 };
 
+var makeWarning = function(message) {
+	return gutil.log(gutil.colors.red(message));
+};
 
 var makeErr = function(message) {
 	return new gutil.PluginError('gulp-awslambda', message);
@@ -67,12 +70,24 @@ module.exports = function(params, opts) {
 
 		gutil.log('Uploading Lambda function "' + functionName + '"...');
 
+		if (opts.profile && opts.config) {
+			return cb(makeWarning('Option "credentials" will take precedence over option "region"'));
+		}
+
 		if (opts.profile !== null) {
 			AWS.config.credentials = new AWS.SharedIniFileCredentials({ profile: opts.profile });
 		}
 
 		AWS.config.update({ region: opts.region });
 
+		if (opts.credentials !== null) {
+			if (opts.credentials.constructor.name === 'Credentials') {
+				AWS.config.credentials = opts.credentials;
+			} else {
+				return cb(makeErr('Option `credentials` is not an instance of Credentials'));
+			}
+		}
+
 		var lambda = new AWS.Lambda();
 		var stream = this;