How do I use AWS S3 without Amazon Cognito?

Question

I am using a Node.js REST API to authenticate my users. Once they are authenticated I allow them to post photos with text. My plan is to store the text and the URL to the photo in the database. That way when they go to the feed of posts, my app will query the database to get the text and URL's and then use all of the URL's to get the images from S3 directly. Is this the correct way to do it and if so how come I can not do so without using cognito. I am trying to cut costs and it seems like cognito would be useless since I already add authentication with my API.

Here is the code I have thus far.

    let S3BucketName = "*******"

    // configure authentication with Cognito
    let CognitoPoolID = "*************"
    let Region = AWSRegionType.USEast1
    let credentialsProvider = AWSCognitoCredentialsProvider(regionType:Region,
                                                            identityPoolId:CognitoPoolID)
    let configuration = AWSServiceConfiguration(region:Region, credentialsProvider:credentialsProvider)
    AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration

    let ext = "png"
    let imageURL = NSBundle.mainBundle().URLForResource("iimage", withExtension: ext)!

    let uploadRequest = AWSS3TransferManagerUploadRequest()
    uploadRequest.body = imageURL
    uploadRequest.key = NSProcessInfo.processInfo().globallyUniqueString + "." + ext
    uploadRequest.bucket = S3BucketName
    uploadRequest.contentType = "image/" + ext

    let transferManager = AWSS3TransferManager.defaultS3TransferManager()
    transferManager.upload(uploadRequest).continueWithBlock { (task) -> AnyObject! in
        if let error = task.error {
            print("Upload failed (\(error))")
        }
        if let exception = task.exception {
            print("Upload failed (\(exception))")
        }
        if task.result != nil {
            let s3URL = NSURL(string: "http://s3.amazonaws.com/\(S3BucketName)/\(uploadRequest.key!)")!
            print("Uploaded to:\n\(s3URL)")
        }
        else {
            print("Unexpected empty result.")
        }
        return nil
    }

Answer 1

For without cognito use this in

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    AWSStaticCredentialsProvider *credentialsProvider = [[AWSStaticCredentialsProvider alloc] initWithAccessKey:AWS_ACCESS_KEY secretKey:AWS_SECRET_KEY];

    AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionAPSoutheast1
                                                                     credentialsProvider:credentialsProvider];

    AWSServiceManager.defaultServiceManager.defaultServiceConfiguration = configuration;
}

and for uploading image use

AWSS3TransferManager *transferManager = [AWSS3TransferManager defaultS3TransferManager];

AWSS3TransferManagerUploadRequest *uploadRequest = [AWSS3TransferManagerUploadRequest new];
uploadRequest.bucket = AWS_S3_BUCKET_NAME;
uploadRequest.key = @"cards/image.png";
uploadRequest.contentType = @"image/png";
uploadRequest.body = imageURL;

[[transferManager upload:uploadRequest] continueWithExecutor:[AWSExecutor mainThreadExecutor]
                                                   withBlock:^id(AWSTask *task) {
                                                       if (task.error) {
                                                           if ([task.error.domain isEqualToString:AWSS3TransferManagerErrorDomain]) {
                                                               switch (task.error.code)
                                                               {
                                                                   case AWSS3TransferManagerErrorCancelled:
                                                                   case AWSS3TransferManagerErrorPaused:
                                                                       break;

                                                                   default:
                                                                       NSLog(@"Error: %@", task.error);
                                                                       break;
                                                               }
                                                           }
                                                           else
                                                           {
                                                               // Unknown error.
                                                               NSLog(@"Error: %@", task.error);
                                                           }
                                                       }

                                                       if (task.result)
                                                       {
                                                           AWSS3TransferManagerUploadOutput *uploadOutput = task.result;
                                                            NSLog(@"success: %@", uploadOutput);
                                                       }
                                                       return nil;
                                                   }];