Implemented EXIF store and display (#19)

* Added EXIF extracting in the backend
* Added EXIF displaying on `image_viewer_page.dart`
* Added Icon for backup option not enable

server/src/modules/background-task/background-task.processor.ts

@@ -0,0 +1,59 @@
+import { InjectQueue, Process, Processor } from '@nestjs/bull';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Job, Queue } from 'bull';
+import { Repository } from 'typeorm';
+import { AssetEntity } from '../../api-v1/asset/entities/asset.entity';
+import { ConfigService } from '@nestjs/config';
+import exifr from 'exifr';
+import { readFile } from 'fs/promises';
+import { Logger } from '@nestjs/common';
+import { ExifEntity } from '../../api-v1/asset/entities/exif.entity';
+
+@Processor('background-task')
+export class BackgroundTaskProcessor {
+  constructor(
+    @InjectRepository(AssetEntity)
+    private assetRepository: Repository<AssetEntity>,
+
+    @InjectRepository(ExifEntity)
+    private exifRepository: Repository<ExifEntity>,
+
+    private configService: ConfigService,
+  ) {}
+
+  @Process('extract-exif')
+  async extractExif(job: Job) {
+    const { savedAsset, fileName, fileSize }: { savedAsset: AssetEntity; fileName: string; fileSize: number } =
+      job.data;
+
+    const fileBuffer = await readFile(savedAsset.originalPath);
+
+    const exifData = await exifr.parse(fileBuffer);
+
+    const newExif = new ExifEntity();
+    newExif.assetId = savedAsset.id;
+    newExif.make = exifData['Make'] || null;
+    newExif.model = exifData['Model'] || null;
+    newExif.imageName = fileName || null;
+    newExif.exifImageHeight = exifData['ExifImageHeight'] || null;
+    newExif.exifImageWidth = exifData['ExifImageWidth'] || null;
+    newExif.fileSizeInByte = fileSize || null;
+    newExif.orientation = exifData['Orientation'] || null;
+    newExif.dateTimeOriginal = exifData['DateTimeOriginal'] || null;
+    newExif.modifyDate = exifData['ModifyDate'] || null;
+    newExif.lensModel = exifData['LensModel'] || null;
+    newExif.fNumber = exifData['FNumber'] || null;
+    newExif.focalLength = exifData['FocalLength'] || null;
+    newExif.iso = exifData['ISO'] || null;
+    newExif.exposureTime = exifData['ExposureTime'] || null;
+    newExif.latitude = exifData['latitude'] || null;
+    newExif.longitude = exifData['longitude'] || null;
+
+    await this.exifRepository.save(newExif);
+
+    try {
+    } catch (e) {
+      Logger.error(`Error extracting EXIF ${e.toString()}`, 'extractExif');
+    }
+  }
+}