created exif service

src/services/upload/exifService.ts

@@ -0,0 +1,98 @@
+import EXIF from 'exif-js';
+import { FILE_TYPE } from 'pages/gallery';
+import { logError } from 'utils/sentry';
+import { NULL_LOCATION, Location } from './fileReadClient';
+
+const SOUTH_DIRECTION = 'S';
+const WEST_DIRECTION = 'W';
+
+interface ParsedEXIFData {
+    location: Location;
+    creationTime: number;
+}
+
+
+export async function getExifData(
+    reader: FileReader,
+    receivedFile: globalThis.File,
+    fileType: FILE_TYPE,
+): Promise<ParsedEXIFData> {
+    try {
+        if (fileType === FILE_TYPE.VIDEO) {
+            // Todo  extract exif data from videos
+            return { location: NULL_LOCATION, creationTime: null };
+        }
+        const exifData: any = await new Promise((resolve) => {
+            reader.onload = () => {
+                resolve(EXIF.readFromBinaryFile(reader.result));
+            };
+            reader.readAsArrayBuffer(receivedFile);
+        });
+        if (!exifData) {
+            return { location: NULL_LOCATION, creationTime: null };
+        }
+        return {
+            location: getEXIFLocation(exifData),
+            creationTime: getUNIXTime(exifData),
+        };
+    } catch (e) {
+        logError(e, 'error reading exif data');
+        throw e;
+    }
+}
+
+function getUNIXTime(exifData: any) {
+    const dateString: string = exifData.DateTimeOriginal || exifData.DateTime;
+    if (!dateString || dateString==='0000:00:00 00:00:00') {
+        return null;
+    }
+    const parts = dateString.split(' ')[0].split(':');
+    const date = new Date(
+        Number(parts[0]),
+        Number(parts[1]) - 1,
+        Number(parts[2]),
+    );
+    return date.getTime() * 1000;
+}
+
+function getEXIFLocation(exifData): Location {
+    if (!exifData.GPSLatitude) {
+        return NULL_LOCATION;
+    }
+
+    const latDegree = exifData.GPSLatitude[0];
+    const latMinute = exifData.GPSLatitude[1];
+    const latSecond = exifData.GPSLatitude[2];
+
+    const lonDegree = exifData.GPSLongitude[0];
+    const lonMinute = exifData.GPSLongitude[1];
+    const lonSecond = exifData.GPSLongitude[2];
+
+    const latDirection = exifData.GPSLatitudeRef;
+    const lonDirection = exifData.GPSLongitudeRef;
+
+    const latFinal = convertDMSToDD(
+        latDegree,
+        latMinute,
+        latSecond,
+        latDirection,
+    );
+
+    const lonFinal = convertDMSToDD(
+        lonDegree,
+        lonMinute,
+        lonSecond,
+        lonDirection,
+    );
+    return { latitude: latFinal * 1.0, longitude: lonFinal * 1.0 };
+}
+
+function convertDMSToDD(degrees, minutes, seconds, direction) {
+    let dd = degrees + minutes / 60 + seconds / 3600;
+
+    if (direction === SOUTH_DIRECTION || direction === WEST_DIRECTION) {
+        dd = dd * -1;
+    }
+
+    return dd;
+}