91 lines
2.4 KiB
TypeScript
91 lines
2.4 KiB
TypeScript
import EXIF from 'exif-js';
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import { logError } from 'utils/sentry';
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import { NULL_LOCATION, Location } from './metadataService';
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const SOUTH_DIRECTION = 'S';
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const WEST_DIRECTION = 'W';
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const CHUNK_SIZE_FOR_EXIF_READING = 4 * 1024 * 1024;
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interface ParsedEXIFData {
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location: Location;
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creationTime: number;
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}
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export async function getExifData(
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worker,
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receivedFile: globalThis.File
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): Promise<ParsedEXIFData> {
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try {
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const fileChunk = await worker.getUint8ArrayView(
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receivedFile.slice(0, CHUNK_SIZE_FOR_EXIF_READING)
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);
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const exifData = EXIF.readFromBinaryFile(fileChunk.buffer);
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if (!exifData) {
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return { location: NULL_LOCATION, creationTime: null };
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}
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return {
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location: getEXIFLocation(exifData),
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creationTime: getUNIXTime(exifData),
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};
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} catch (e) {
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logError(e, 'error reading exif data');
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// ignore exif parsing errors
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}
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}
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function getUNIXTime(exifData: any) {
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const dateString: string = exifData.DateTimeOriginal || exifData.DateTime;
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if (!dateString || dateString === '0000:00:00 00:00:00') {
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return null;
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}
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const parts = dateString.split(' ')[0].split(':');
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const date = new Date(
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Number(parts[0]),
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Number(parts[1]) - 1,
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Number(parts[2])
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);
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return date.getTime() * 1000;
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}
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function getEXIFLocation(exifData): Location {
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if (!exifData.GPSLatitude) {
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return NULL_LOCATION;
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}
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const latDegree = exifData.GPSLatitude[0];
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const latMinute = exifData.GPSLatitude[1];
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const latSecond = exifData.GPSLatitude[2];
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const lonDegree = exifData.GPSLongitude[0];
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const lonMinute = exifData.GPSLongitude[1];
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const lonSecond = exifData.GPSLongitude[2];
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const latDirection = exifData.GPSLatitudeRef;
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const lonDirection = exifData.GPSLongitudeRef;
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const latFinal = convertDMSToDD(
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latDegree,
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latMinute,
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latSecond,
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latDirection
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);
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const lonFinal = convertDMSToDD(
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lonDegree,
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lonMinute,
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lonSecond,
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lonDirection
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);
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return { latitude: latFinal * 1.0, longitude: lonFinal * 1.0 };
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}
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function convertDMSToDD(degrees, minutes, seconds, direction) {
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let dd = degrees + minutes / 60 + seconds / 3600;
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if (direction === SOUTH_DIRECTION || direction === WEST_DIRECTION) {
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dd = dd * -1;
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}
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return dd;
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}
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