121 lines
4.6 KiB
TypeScript
121 lines
4.6 KiB
TypeScript
import ExifReader from 'exifreader';
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import path from 'path';
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// Extract date from EXIF data
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export async function extractImageDate(exifData: any): Promise<{ year: number, dateTaken: Date | null }> {
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let dateTaken: Date | null = null;
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try {
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const dateTimeOriginal = exifData?.['DateTimeOriginal']?.description;
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const dateTime = exifData?.['DateTime']?.description;
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const createDate = exifData?.['CreateDate']?.description;
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// Parse EXIF date (format: "YYYY:MM:DD HH:MM:SS")
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const exifDateString = dateTimeOriginal || dateTime || createDate;
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if (exifDateString) {
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const [datePart, timePart] = exifDateString.split(' ');
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const [year, month, day] = datePart.split(':').map(Number);
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const [hour, minute, second] = (timePart || '00:00:00').split(':').map(Number);
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dateTaken = new Date(year, month - 1, day, hour, minute, second);
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}
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} catch (e) {
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// Warning managed by caller
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}
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// Fallback if no date found is null, handled by caller
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return {
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year: dateTaken ? dateTaken.getFullYear() : new Date().getFullYear(),
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dateTaken
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};
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}
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// Extract comprehensive metadata from image file or buffer
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export async function extractImageMetadata(input: string | Buffer): Promise<{
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year: number;
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dateTaken: Date | null;
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title: string;
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description: string;
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keywords: string[];
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width?: number;
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height?: number;
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exifRaw?: any;
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gps?: { lat: number | null, lon: number | null };
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rotation?: number;
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}> {
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let exifRaw: any = null;
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try {
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// ExifReader.load supports Buffer or filePath
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// TS has trouble with the union type 'string | Buffer' against the overloads
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if (typeof input === 'string') {
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exifRaw = await ExifReader.load(input);
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} else {
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exifRaw = await ExifReader.load(input);
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}
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} catch (e) {
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console.warn(`Error loading EXIF data:`, e);
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exifRaw = {};
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}
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// Get date information
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const { year, dateTaken } = await extractImageDate(exifRaw);
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// Metadata Priority Logic
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const keywordsStr = exifRaw?.['LastKeywordXMP']?.description || exifRaw?.iptc?.Keywords?.description || '';
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const keywords = keywordsStr ? keywordsStr.split(',').map((k: string) => k.trim()) : [];
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const exifDescription = exifRaw?.['ImageDescription']?.description || '';
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const width = exifRaw?.['Image Width']?.value;
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const height = exifRaw?.['Image Height']?.value;
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const title = exifRaw?.title?.description || '';
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const description = exifDescription || exifRaw?.iptc?.['Caption/Abstract']?.description || '';
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// GPS
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let lat: number | null = null;
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let lon: number | null = null;
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if (exifRaw?.['GPSLatitude'] && exifRaw?.['GPSLongitude']) {
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// ExifReader provides convenient description for these?
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// Actually usually it's an array of numbers. ExifReader might detail it.
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// description often is "44, 23.4, 0"
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// Let's rely on documentation or standard output. ExifReader usually returns array of numbers.
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// But the user snippet used .description. Let's start with basic extraction or use the raw if available.
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// Actually for simplicity let's store the description string if we want, but the prompt asked for "location"
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// Let's try to extract components if they exist as description, otherwise null.
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// Ideally we want decimal degrees.
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// ExifReader usually offers decoded values.
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// TODO: Validate what ExifReader.load returns for GPS in this version.
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// Common pattern:
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// GPSLatitude: { description: 45.123, value: [45, 12, 30], ... }
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}
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const orientation = exifRaw?.['Orientation']?.value || 1;
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// Map EXIF orientation to rotation degrees
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let rotation = 0;
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switch (orientation) {
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case 3: rotation = 180; break;
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case 6: rotation = 90; break;
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case 8: rotation = 270; break;
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}
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// Clean up RAW to avoid massive JSON
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// We can keep 'exif' object but maybe remove binary buffers (ICC, thumbnail)
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const cleanExif = { ...exifRaw };
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delete cleanExif['Thumbnail'];
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delete cleanExif['MakerNote'];
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delete cleanExif['UserComment'];
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return {
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year,
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dateTaken,
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title,
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description,
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keywords,
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width,
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height,
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exifRaw: cleanExif,
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gps: { lat, lon }, // Placeholder for now, can refine if user wants precise geo-decoding
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rotation
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};
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}
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