feat: add exif data to image tags

package.json

@@ -16,6 +16,7 @@
     "@astrojs/tailwind": "^5.1.0",
     "astro": "^4.11.0",
     "astro-i18n-aut": "^0.7.0",
+    "exifreader": "^4.23.3",
     "svelte": "^4.2.18",
     "svelte-gestures": "^5.0.1",
     "tailwindcss": "^3.4.4",

pnpm-lock.yaml

@@ -26,6 +26,9 @@ importers:
       astro-i18n-aut:
         specifier: ^0.7.0
         version: 0.7.0(astro@4.11.0(@types/node@20.14.7)(typescript@5.5.2))(kleur@4.1.5)
+      exifreader:
+        specifier: ^4.23.3
+        version: 4.23.3
       svelte:
         specifier: ^4.2.18
         version: 4.2.18
@@ -952,6 +955,10 @@ packages:
   '@vscode/l10n@0.0.18':
     resolution: {integrity: sha512-KYSIHVmslkaCDyw013pphY+d7x1qV8IZupYfeIfzNA+nsaWHbn5uPuQRvdRFsa9zFzGeudPuoGoZ1Op4jrJXIQ==}
 
+  '@xmldom/xmldom@0.8.10':
+    resolution: {integrity: sha512-2WALfTl4xo2SkGCYRt6rDTFfk9R1czmBvUQy12gK2KuRKIpWEhcbbzy8EZXtz/jkRqHX8bFEc6FC1HjX4TUWYw==}
+    engines: {node: '>=10.0.0'}
+
   acorn-jsx@5.3.2:
     resolution: {integrity: sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==}
     peerDependencies:
@@ -1346,6 +1353,9 @@ packages:
     resolution: {integrity: sha512-VyhnebXciFV2DESc+p6B+y0LjSm0krU4OgJN44qFAhBY0TJ+1V61tYD2+wHusZ6F9n5K+vl8k0sTy7PEfV4qpg==}
     engines: {node: '>=16.17'}
 
+  exifreader@4.23.3:
+    resolution: {integrity: sha512-/Ii4jiNp/5BXdKOiWXZYrWmZFn/ANu3bMVGO7GFQufao5M52/fK2OsAPMH34PL4S79z1eZBzAoaYyBXit0zzVA==}
+
   extend-shallow@2.0.1:
     resolution: {integrity: sha512-zCnTtlxNoAiDc3gqY2aYAWFx7XWWiasuF2K8Me5WbN8otHKTUKBwjPtNpRs/rbUZm7KxWAaNj7P1a/p52GbVug==}
     engines: {node: '>=0.10.0'}
@@ -3871,6 +3881,9 @@ snapshots:
 
   '@vscode/l10n@0.0.18': {}
 
+  '@xmldom/xmldom@0.8.10':
+    optional: true
+
   acorn-jsx@5.3.2(acorn@8.12.0):
     dependencies:
       acorn: 8.12.0
@@ -4327,6 +4340,10 @@ snapshots:
       signal-exit: 4.1.0
       strip-final-newline: 3.0.0
 
+  exifreader@4.23.3:
+    optionalDependencies:
+      '@xmldom/xmldom': 0.8.10
+
   extend-shallow@2.0.1:
     dependencies:
       is-extendable: 0.1.1

src/components/Image.astro

@@ -1,7 +1,7 @@
 ---
 import type { ImageMetadata } from "astro";
 import { Picture as AstroImage } from "astro:assets";
-import { generateThumbHash } from "@helpers/image";
+import { generateThumbHash, getExifData } from "@helpers/image";
 interface Props {
   src: ImageMetadata;
   alt: string;
@@ -24,6 +24,8 @@ const {
 
 let thumbhash = hash ? await generateThumbHash(image) : "";
 
+let exif = await getExifData(image);
+
 const sizes = [
   {
     width: 240,
@@ -47,6 +49,7 @@ const sizes = [
   src={image}
   alt={alt}
   data-thumbhash={thumbhash}
+  data-exif={JSON.stringify(exif)}
   pictureAttributes={{
     class: `${hash ? "block h-full relative" : ""} ${loader ? "thumb" : ""} ${pictureClass}`,
   }}

src/components/ImageGallery.svelte

@@ -150,6 +150,7 @@
       try {
         let rawExif = image.getAttribute("data-exif");
         exif = JSON.parse(rawExif);
+        console.log(exif);
       } catch (error) {
         // No biggie
       }
@@ -187,8 +188,7 @@
           class:active={currentIndex === i}
           on:click={() => {
             currentIndex = i;
-          }}
-        />
+          }} />
       {/each}
     </div>
   {/if}
@@ -204,21 +204,18 @@
       on:swipe={handleSwipe}
       on:wheel|passive={handleScroll}
       on:mousemove={handleMouseMove}
-      on:pointermove={handlePointerMove}
-    >
+      on:pointermove={handlePointerMove}>
       {#if progress[currentIndex] && progress[currentIndex] < 0.99}
         <div
           transition:fade
           id="progress"
-          style={`transform: scaleX(${progress[currentIndex]});`}
-        />
+          style={`transform: scaleX(${progress[currentIndex]});`} />
       {/if}
 
       <img
         class="background"
         src={images[currentIndex].preview}
-        alt="background blur"
-      />
+        alt="background blur" />
 
       <span>
         <img
@@ -227,15 +224,14 @@
           }px ${window.innerHeight - my}px`}
           srcset={images[currentIndex].loaded ? "" : images[currentIndex].src}
           src={images[currentIndex].loaded}
-          alt={images[currentIndex].alt}
-        />
+          alt={images[currentIndex].alt} />
       </span>
     </div>
     {#if images[currentIndex].exif}
       {@const exif = images[currentIndex].exif}
       <div class="exif" on:click={() => console.log(exif)}>
         {#if "FocalLength" in exif}
-          {exif.FocalLength}mm |
+          {exif.FocalLength} |
         {/if}
 
         {#if "FNumber" in exif}

src/helpers/image.ts

@@ -1,16 +1,14 @@
 let loadingSharp = false;
 import { rgbaToThumbHash } from "thumbhash";
+import ExifReader from 'exifreader';
 
 let s: typeof import("sharp") | undefined;
 
 async function getSharp(): Promise<typeof import("sharp") | undefined> {
 
   if (s) return s;
-
-  if (import.meta.env.MODE !== "development") {
   s = (await import("sharp")).default;
   return s;
-  }
 
   if (!loadingSharp) {
     loadingSharp = true;
@@ -42,3 +40,33 @@ export async function generateThumbHash(image: { width: number, height: number }
   const buffer = rgbaToThumbHash(smallWidth, smallHeight, smallImg);
   return Buffer.from(buffer).toString("base64");
 }
+
+const allowedExif = [
+  "ApertureValue",
+  "DateTimeOriginal",
+  "ExposureTime",
+  "ApertureValue",
+  "FNumber",
+  "FocalLength",
+  "GPSLatitude",
+  "GPSLongitude",
+  "GPSAltitude",
+  "IsoSpeedRatings",
+];
+
+export async function getExifData(image: { fsPath: string }) {
+  const sharp = await getSharp();
+  if (!sharp) return;
+  const tags = await ExifReader.load(image.fsPath, { async: true });
+
+  const out: Record<string, any> = {};
+  let hasExif = false;
+
+  for (const key of allowedExif) {
+    if (!tags[key]) continue;
+    hasExif = true;
+    out[key] = tags[key].description;
+  }
+
+  return hasExif ? out : undefined;
+}