AWS Upload View

RWUploadView.h

//
//  RWUploadView.h
//  helpers/gists
//
//  Created by Robin Wohlers-Reichel on 24/08/2014.
//  Copyright (c) 2014 robinwohlers. All rights reserved.
//

#import <UIKit/UIKit.h>

@class RWUploadView;

@protocol RWUploadViewDelegate <NSObject>

- (void) rwUploadViewDidFinish:(RWUploadView *)controller;

@end

@interface RWUploadView : UIView {
    UILabel *statusLabel;
    UIActivityIndicatorView *activityIndicator;
}

@property (weak, nonatomic) id <RWUploadViewDelegate> delegate;

- (void)beginMovieUploadForURL:(NSURL *)url withName:(NSString *)name;

@end

RWUploadView.m

//
//  RWUploadView.m
//  helpers/gists
//
//  Created by Robin Wohlers-Reichel on 24/08/2014.
//  Copyright (c) 2014 robinwohlers. All rights reserved.
//

#import "RWUploadView.h"
#import <AVFoundation/AVFoundation.h>
#import <Parse/Parse.h>
#import <AWSiOSSDKv2/S3.h>
#import "Constants.h"

@implementation RWUploadView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(self.frame.origin.x + 36.0f, self.frame.origin.y + 14.5f, 276.0f, 21.0f)];
        statusLabel.text = @"Finishing Video";
        [self addSubview:statusLabel];
        activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        activityIndicator.frame = CGRectMake(8.0f, 15.0f, 20.0f, 20.0f);
        [activityIndicator startAnimating];
        [self addSubview:activityIndicator];
        [self setBackgroundColor:[UIColor colorWithWhite:0.9 alpha:1]];
    }
    return self;
}

-(void)beginMovieUploadForURL:(NSURL *)url withName:(NSString *)name{
    [self handleMediaUploadForURL:url withName:name];
}

-(void)initialiseMediaUploadForURL:(NSURL *)url withName:(NSString *)name {
    NSString *commonFileName = [self getRandomFilename];
    
    AVURLAsset *asset = [AVURLAsset assetWithURL:url];
    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    [imageGenerator generateCGImagesAsynchronouslyForTimes:@[[NSValue valueWithCMTime:kCMTimeZero]] completionHandler:^(CMTime requestedTime, CGImageRef image, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error) {
        if (image != nil) {
            [self uploadImageForUIImage:[UIImage imageWithCGImage:image] withFileName:commonFileName];
        }
    }];
}

-(void) handleMediaUploadForURL:(NSURL *)url withName:(NSString *)name {
    //start loading indicator
    //generate random file name
    //upload video
    //generate thumbnail
    //upload thumbnail
    //add to database
    //end loading indicator
    NSLog(@"started handling");
    
    UIApplication* app = [UIApplication sharedApplication];
    app.networkActivityIndicatorVisible = YES;
    
    //generate file name
    NSString *commonFileName = [self getRandomFilename];
    
    //upload video
    [self uploadVideoForURL:url withFileName:commonFileName];
    
    //generate thumbnail
    AVURLAsset *asset = [AVURLAsset assetWithURL:url];
    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];
    [imageGenerator generateCGImagesAsynchronouslyForTimes:@[[NSValue valueWithCMTime:kCMTimeZero]] completionHandler:^(CMTime requestedTime, CGImageRef image, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error) {
        if (image != nil) {
            [self uploadImageForUIImage:[UIImage imageWithCGImage:image] withFileName:commonFileName];
        }
    }];
    
    //add to database
    PFObject *videoEntry = [PFObject objectWithClassName:@"videos"];
    videoEntry[@"videoTitle"] = name;
    videoEntry[@"videoUser"] = commonFileName;
    videoEntry[@"videoURL"] = [NSString stringWithFormat:@"%@.mp4",commonFileName];
    videoEntry[@"thumbnailURL"] = [NSString stringWithFormat:@"%@.jpg",commonFileName];
    videoEntry[@"videoLikeCount"] = @0;
    [videoEntry saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        [self.delegate rwUploadViewDidFinish:self];
    }];
    
    //end loading indicator
    app.networkActivityIndicatorVisible = NO;
}

- (void) uploadImageForUIImage:(UIImage *)image withFileName:(NSString *)fileName {
    //save to file
    NSURL *tmpDirURL = [NSURL fileURLWithPath:NSTemporaryDirectory() isDirectory:YES];
    NSURL *imageURL = [[tmpDirURL URLByAppendingPathComponent:fileName] URLByAppendingPathExtension:@"jpg"];
    [UIImageJPEGRepresentation(image, 0.7f) writeToURL:imageURL atomically:YES];
    
    //upload
    AWSS3TransferManagerUploadRequest *imageUpload = [AWSS3TransferManagerUploadRequest new];
    imageUpload.bucket = S3BucketName;
    imageUpload.key = [NSString stringWithFormat:@"%@.jpg",fileName];
    imageUpload.body = imageURL;
    imageUpload.contentType = @"image/jpeg";
    NSLog(@"image file name:%@",fileName);
    
    AWSS3TransferManager *transferManager = [AWSS3TransferManager defaultS3TransferManager];
    
    [[transferManager upload:imageUpload] continueWithExecutor:[BFExecutor mainThreadExecutor] withBlock:^id(BFTask *task) {
        //delete image on disk on completion
        [[NSFileManager defaultManager] removeItemAtURL:imageURL error:nil];
        NSLog(@"image upload error %@",task.error);
        return nil;
    }];
}

- (void) uploadVideoForURL:(NSURL *)url withFileName:(NSString *)fileName {
    AWSS3TransferManagerUploadRequest *videoObject = [AWSS3TransferManagerUploadRequest new];
    videoObject.bucket = S3BucketName;
    videoObject.key = [NSString stringWithFormat:@"%@.mp4",fileName];
    videoObject.body = url;
    videoObject.contentType = @"video/mp4";
    NSLog(@"video file name:%@",fileName);
    
    AWSS3TransferManager *transferManager = [AWSS3TransferManager defaultS3TransferManager];
    
    [[transferManager upload:videoObject] continueWithExecutor:[BFExecutor mainThreadExecutor] withBlock:^id(BFTask *task) {
        //delete video file on disk on completion
        [[NSFileManager defaultManager] removeItemAtURL:url error:nil];
        NSLog(@"video upload error %@",task.error);
        return nil;
    }];
}

- (NSString *)getRandomFilename{
    NSString *alphabet  = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXZY0123456789";
    NSMutableString *s = [NSMutableString stringWithCapacity:20];
    for (NSUInteger i = 0U; i < 20; i++) {
        u_int32_t r = arc4random() % [alphabet length];
        unichar c = [alphabet characterAtIndex:r];
        [s appendFormat:@"%C", c];
    }
    return [NSString stringWithString:s];
}

@end