Connecting your mobile app to AWS can unlock powerful features. With AWS, you can streamline your sign-in experience with social login, store user data in the cloud and share it between devices, display location-specific information using geospatial queries, and engage your customers across multiple platforms with push notifications. In this session, you learn how to integrate these powerful features into a sample mobile app using Amazon DynamoDB, Amazon Simple Notification Service (Amazon SNS), and web identity federation.

1. Building Cloud-backed Mobile Apps
Glenn Dierkes, AWS Mobile
November 13, 2013
© 2013 Amazon.com, Inc. and its affiliates. All rights reserved. May not be copied, modified, or distributed in whole or in part without the express consent of Amazon.com, Inc.

2. Session Goals
• Cloud services, great apps
• Apps today
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–
–
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Social Logins
Geo Tagging
File and Data Storage
Push Notifications

3. AWS Mobile Landscape
User Data
Social Login
Mobile Push
File Storage
Amazon DynamoDB
AWS IAM
Amazon S3
Amazon SNS

4. Demo of the Mobile Photo Share sample App
An app to share geo-tagged photos with others.

5. Mobile Photo Share – Architecture
Geo Library for Amazon DynamoDB
Geo
AWS IAM
Web Identity Federation
AWS Mobile SDKs
S3 Transfer Manager
Amazon S3
Amazon DynamoDB

6. Web Identity Federation
Geo Library for Amazon DynamoDB
Geo
AWS IAM
Web Identity Federation
AWS Mobile SDKs
S3 Transfer Manager
Amazon S3
Amazon DynamoDB

7. Web Identity Auth Flow
Access
Policy
Mobile Client
${id}
Amazon S3 Bucket
AWS STS
AWS Cloud

8. Web Identity Federation
• Social Logins
– Managing Users is hard
– Allow users to connect with their existing accounts.
• Facebook, Google, and Amazon.
– Provides restricted temporary AWS Credentials
• Policy variables
• Don’t put credentials in your app’s code (can’t rotate, not secure)
• Learn More
– SEC401 session with Bob Kinney (Thursday 1:30 – 2:30 pm)
– https://mobile.awsblog.com/post/Tx3UKF4SV4V0LV3

9. S3 Transfer Manager
Geo Library for Amazon DynamoDB
Geo
AWS IAM
Web Identity Federation
AWS Mobile SDKs
S3 Transfer Manager
Amazon S3
Amazon DynamoDB

10. Amazon S3 Transfer Manager
• Upload/Download files to/from Amazon S3
– Pictures
– Videos
– Music
• Pause, Resume, Cancel
• Efficiency and failure tolerance
• No backend

11. Amazon S3 Transfer Manager – Demo
• Upload Photo Page from Mobile Photo Share
• View Photo Page from Mobile Photo Share

12. Amazon S3 Multipart Upload
-(void)multipartUpload:(NSData*)dataToUpload inBucket:(NSString*)bucket forKey:(NSString*)key
{
S3InitiateMultipartUploadRequest *initReq = [[S3InitiateMultipartUploadRequest alloc] initWithKey:key inBucket:bucket];
S3MultipartUpload *upload = [s3 initiateMultipartUpload:initReq].multipartUpload;
S3CompleteMultipartUploadRequest *compReq = [[S3CompleteMultipartUploadRequest alloc] initWithMultipartUpload:upload];
int numberOfParts = [self countParts:dataToUpload];
for ( int part = 0; part < numberOfParts; part++ ) {
NSData *dataForPart = [self getPart:part fromData:dataToUpload];
S3UploadPartRequest *upReq = [[S3UploadPartRequest alloc] initWithMultipartUpload:upload];
upReq.partNumber = ( part + 1 );
upReq.contentLength = [dataForPart length];
upReq.stream = stream;
S3UploadPartResponse *response = [s3 uploadPart:upReq];
[compReq addPartWithPartNumber:( part + 1 ) withETag:response.etag];
}
[s3 completeMultipartUpload:compReq];
}

13. Amazon S3 Multipart Upload (cont.)
-(NSData*)getPart:(int)part fromData:(NSData*)fullData
{
NSRange range;
range.length = PART_SIZE;
range.location = part * PART_SIZE;
int maxByte = (part + 1) * PART_SIZE;
if ( [fullData length] < maxByte ) {
range.length = [fullData length] - range.location;
}
return [fullData subdataWithRange:range];
}
-(int)countParts:(NSData*)fullData
{
int q = (int)([fullData length] / PART_SIZE);
int r = (int)([fullData length] % PART_SIZE);
return ( r == 0 ) ? q : q + 1;
}

14. Amazon S3 Transfer Manager – Code
// Creating the transfer manager
self.transferManager = [S3TransferManager new];
self.transferManager.s3 = s3client;
// Upload image
[self.transferManager uploadFile:fileName bucket:bucketName key:objectName];
// Download image
[self.transferManager downloadFile:fileName bucket:bucketName key:objectName];
// Pause, Resume, Cancel
[self.transferManager pauseAllTransfers];
[self.transferManager resumeAllTransfers];
[self.transferManager cancelAllTransfers];

15. Amazon S3 Transfer Manager
• Learn More
– http://mobile.awsblog.com/post/TxIRFEQTW9XU8G
– http://aws.amazon.com/mobile/

16. Geo Library for Amazon DynamoDB
Geo Library for Amazon DynamoDB
Geo
AWS IAM
Web Identity Federation
AWS Mobile SDKs
S3 Transfer Manager
Amazon S3
Amazon DynamoDB

17. Geo Library for Amazon DynamoDB
• Java Library
– Produces geo-hash indexes for use with DynamoDB
• Used in a middle-tier
– Helps to minimize client side networking and data manipulation
• Geo-tagged data
– Example: Store Locator

18. Geo Library for Amazon DynamoDB
Amazon DynamoDB
Geo
Geo Library for Amazon DynamoDB
•
•
•
•
•
getPoint
putPoint
deletePoint
queryRadius
queryRectangle

19. Geo Library for Amazon DynamoDB – Demo
• Picture Map from Mobile Photo Share

20. Geo Library for Amazon DynamoDB – Server Code
// Setup the Amazon DynamoDB Client
AmazonDynamoDBClient ddb = new AmazonDynamoDBClient( credentials );
ddb.setRegion( Region.getRegion( Regions.fromName( "us-east-1" ) ) );
// Configure the GeoDataManager
GeoDataManagerConfiguration config = new GeoDataManagerConfiguration( ddb, "Photos" );
// Create the GeoDataManager
GeoDataManager geoDataManager = new GeoDataManager( config );

21. Geo Library for Amazon DynamoDB – Server Code
// Requesting a geo-query server-side
GeoPoint centerPoint = new GeoPoint(requestObject.getDouble("lat"),
requestObject.getDouble("lng"));
// Identify attributes to return from DynamoDB table
List<String> attributesToGet = new ArrayList<String>();
attributesToGet.add( “title” );
attributesToGet.add( “userId” );
QueryRadiusRequest request = new QueryRadiusRequest( centerPoint, 5000 );
request.getQueryRequest().setAttributesToGet( attributesToGet );
// Submit the request through the Geo Library
QueryRadiusResult queryRadiusResult = geoDataManager.queryRadius( queryRadiusRequest );

22. Geo Library for Amazon DynamoDB – Server Code
// Analyzing the results
Map<String, AttributeValue> geoItems = geoQueryResult.getItem();
List<String> resultArray = new ArrayList<String>();
for (Map<String, AttributeValue> item : geoItems ) {
String userId = item.get( "userId” ).getS();
String title = item.get( “title” ).getS();
if ( filterUserId.equalsIgnoreCase( userId ) || title.startsWith( “public” ) ) {
resultArray.add( title );
}
}
return resultArray;

23. Geo Library for Amazon DynamoDB
• Learn More Here
– https://github.com/awslabs/dynamodb-geo
– http://mobile.awsblog.com/post/TxWTJOSLE7O3J2/
• Sample
– Provides an AWS Elastic Beanstalk middle tier
– iOS App

24. AWS Mobile SDKs
Geo Library for Amazon DynamoDB
Geo
AWS IAM
Web Identity Federation
AWS Mobile SDKs
S3 Transfer Manager
Amazon S3
Amazon DynamoDB

25. AWS Mobile SDKs – Demo
• Favorite Pictures from Mobile Photo Share

26. AWS Mobile SDKs
• Supports a number of AWS services
• Amazon DynamoDB, Amazon S3
• Amazon SQS, Amazon SNS, and more
• Fine-grained access control
• Segregates user data in DynamoDB
• Multiple Platforms
• iOS
• Android

27. AWS Mobile SDKs – Pattern
Consistent usage pattern
•
•
•
•
Create the service client
Create the request
Submit the request
Process the results

28. AWS Mobile SDKs – get favorites
// Create the client
AmazonDynamoDBClient *ddb = [[AmazonDynamoDBClient alloc] initWithCredentialsProvider:self.provider];
// Create the get request
DynamoDBAttributeValue *userId = [[DynamoDBAttributeValue alloc] initWithS:
[AmazonKeyChainWrapper userId]];
DynamoDBGetItemRequest *getItemRequest = [DynamoDBGetItemRequest new];
getItemRequest.tableName = DYNAMODB_TABLENAME;
getItemRequest.key = [NSMutableDictionary dictionaryWithObject:userId forKey:@"UserId"];
getItemRequest.consistentRead = YES;
// Submit the request
DynamoDBGetItemResponse *getItemResponse = [ddb getItem:getItemRequest];
// Process the results
DynamoDBAttributeValue *favorites = [getItemResponse.item valueForKey:@"Favorites"];
return favorites.sS;

29. AWS Mobile SDKs – put favorites
// Create the put request
DynamoDBPutItemRequest *putItemRequest = [DynamoDBPutItemRequest new];
putItemRequest.tableName = DYNAMODB_TABLENAME;
DynamoDBAttributeValue *userId = [DynamoDBAttributeValue new];
userId.s = theUserId;
DynamoDBAttributeValue *newFavorites = [DynamoDBAttributeValue new];
newFavorites.sS = theFavorites;
[putItemRequest.item setValue:userId forKey:@"UserId"];
[putItemRequest.item setValue:newFavorites forKey:@"Favorites"];
// Submit the request
[ddb putItem:putItemRequest];

30. AWS Mobile SDKs
• Learn More Here
– http://mobile.awsblog.com/post/Tx1U4RV2QI1MVWS/
– AWS SDK for Android
• http://aws.amazon.com/sdkforandroid
– AWS SDK for iOS
• http://aws.amazon.com/sdkforios

31. SNS Mobile Push
• Push Notifications
– Single Topic – Push to users all platforms
• Apple, Amazon, Google
• Push to individual devices
– Console for easy setup
• Certificates
• Keys

32. SNS Mobile Push – Register Device
Create a Platform Application
•
•
•
Specify the support push notification service (APNS, GCM, etc.)
Console
Platform Application ARN
// Registering a device
SNSCreatePlatformEndpointRequest *request = [SNSCreatePlatformEndpointRequest new];
request.customUserData = @"Here's the custom data for the user.";
request.token = deviceTokenString;
request.platformApplicationArn = @”The Platform Application ARN”;
[snsClient createPlatformEndpoint:request];

33. SNS Mobile Push
• Publish
– AWS Management Console
– AWS SDKs
• Learn More Here
– http://aws.typepad.com/aws/2013/08/push-notifications-to-mobiledevices-using-amazon-sns.html
– http://docs.aws.amazon.com/sns/latest/dg/SNSMobilePush.html
– MBL308 session (Friday 9:00 – 10:00 am)
• Engage Your Customers with Amazon SNS Mobile Push

34. AWS Mobile
• Mobile Development Center
– http://aws.amazon.com/mobile
• Get Help
– Forum
https://forums.aws.amazon.com/forum.jspa?forumID=88
– Stack Overflow

35. AWS Mobile – Next Steps
• Mobile Photo Share
– Server and iOS App
– https://github.com/awslabs/reinvent2013-mobile-photo-share
• Other samples and SDKs
– https://github.com/awslabs/aws-sdk-android-samples
– https://github.com/awslabs/aws-sdk-ios-samples

36. Connect
• Booth & Office Hours
– Thursday 4:30 – 5:30 pm
– Friday 9:00 – 10:00 am
• AWS Mobile Blog
– http://mobile.awsblog.com
• Twitter
– @awsformobile

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