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 an 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 parsed to get the decryption data.

Example

    #import <ThingSmartCameraKit/ThingSmartCameraKit.h>
    #import <ThingEncryptImage/ThingEncryptImage.h>
    #import <SDWebImage/UIImageView+WebCache.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 sd_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 <SDWebImage/UIImageView+WebCache.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;
    }