Encrypted Images

Detection alerts can be enabled for smart devices. In most cases, a real-time video screenshot is uploaded to the cloud if a detection alert is generated. IPC SDK is designed to encrypt this image and attach it to the result of querying an alert message or cloud storage event. The component ThingEncryptImage must be used to display this encrypted image.

Decryption component

Use UIImageView to add the API method for displaying the encrypted images. For more information about the API definitions, see UIImageView+ThingAESImage.h.

Display encrypted image

API description

- (void)thing_setAESImageWithPath:(NSString *)imagePath
                    encryptKey:(NSString *)encryptKey;

Parameters

Set placeholder image and display encrypted image

API description

- (void)thing_setAESImageWithPath:(NSString *)imagePath
                    encryptKey:(NSString *)encryptKey
              placeholderImage:(UIImage *)placeholderImage;

Parameters

Display encrypted image and set callback

API description

- (void)thing_setAESImageWithPath:(NSString *)imagePath
                    encryptKey:(NSString *)encryptKey
                     completed:(nullable ThingEncryptWebImageCompletionBlock)completedBlock;

Parameters

Detection alerts

In an alert, the value of the attached image ThingSmartCameraMessageModel.attachPic consists of the image URL and encryption key. Both sections are concatenated in the format of {path}@{key}. To display the encrypted image, this concatenated string is divided to get the decryption data.

Example

#import <ThingSmartCameraKit/ThingSmartCameraKit.h>
#import <ThingEncryptImage/ThingEncryptImage.h>

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cell"];
    }
    ThingSmartCameraMessageModel *messageModel = [self.messageModelList objectAtIndex:indexPath.row];
    NSArray *components = [messageModel.attachPic componentsSeparatedByString:@"@"];
    if (components.count != 2) {
        [cell.imageView thing_setImageWithURL:[NSURL URLWithString:messageModel.attachPic] placeholderImage:[self placeHolder]];
    }else {
        [cell.imageView thing_setAESImageWithPath:components.firstObject encryptKey:components.lastObject placeholderImage:[self placeHolder]];
    }
    cell.imageView.frame = CGRectMake(0, 0, 88, 50);
    cell.textLabel.text = messageModel.msgTitle;
    cell.detailTextLabel.text = messageModel.msgContent;
    return cell;
}

Cloud storage events

In cloud storage events, the value of the event screenshot ThingSmartCloudTimeEventModel.snapshotUrl is the complete URL of the image, and the key uses the unified key for cloud-stored video playback.

Example

#import <ThingSmartCameraKit/ThingSmartCameraKit.h>
#import <ThingEncryptImage/ThingEncryptImage.h>

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSDateFormatter *formatter = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        formatter = [[NSDateFormatter alloc] init];
        formatter.dateFormat = @"HH:mm:ss";
    });
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"event"];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"event"];
    }
    ThingSmartCloudTimeEventModel *eventModel = [self.eventModels objectAtIndex:indexPath.row];
    [cell.imageView thing_setAESImageWithPath:eventModel.snapshotUrl encryptKey:self.cloudManager.encryptKey placeholderImage:[self placeholder]];
    cell.textLabel.text = eventModel.describe;
    cell.detailTextLabel.text = [formatter stringFromDate:[NSDate dateWithTimeIntervalSince1970:eventModel.startTime]];
    return cell;
}

Download encrypted image

Download an encrypted image using the ThingEncryptImageDownloader class. For more information about the API definitions, see ThingEncryptImageDownloader.h.

Initialize the download class

API description

+ (instancetype)sharedManager;

Download an encrypted image

API description

- (void)downloadEncryptImageWithPath:(NSString *)imagePath
                          encryptKey:(nullable NSString *)encryptKey
                           completed:(nullable ThingEncryptWebImageCompletionBlock)completedBlock;

Parameters

Example

#import <ThingEncryptImage/ThingEncryptImage.h>

- (void)downloadEncryptImageWithPath:(NSString *)imagePath encryptKey:(nullable NSString *)encryptKey {
    [[ThingEncryptImageDownloader sharedManager] downloadEncryptImageWithPath:imagePath encryptKey:encryptKey completed:^(UIImage * _Nullable image, NSURL * _Nullable url, ThingEncryptWebImageFromType from, ThingEncryptWebImageStage stage, NSError * _Nullable error) {
        if (image) {
            NSLog(@"download success");
        }else {
            NSLog(@"download error(%@)",error);
        }
    }];
}