Add inferSize to getImage so width and height are optional for remote images

.changeset/tame-cameras-change.md

@@ -0,0 +1,18 @@
+---
+"astro": minor
+---
+
+Adds a new optional `astro:assets` image attribute `inferSize` for use with remote images.
+
+Remote images can now have their dimensions inferred just like local images. Setting `inferSize` to `true` allows you to use `getImage()` and the `<Image />` and `<Picture />` components without setting the `width` and `height` properties.
+
+```astro
+---
+import { Image, Picture, getImage } from 'astro:assets';
+const myPic = await getImage({ src: "https://example.com/example.png", inferSize: true })
+---
+<Image src="https://example.com/example.png" inferSize alt="" />
+<Picture src="https://example.com/example.png" inferSize alt="" />
+```
+
+Read more about [using `inferSize` with remote images](https://docs.astro.build/en/guides/images/#infersize) in our documentation.

packages/astro/components/Image.astro

@@ -1,5 +1,9 @@
 ---
-import { getImage, type LocalImageProps, type RemoteImageProps } from 'astro:assets';
+import {
+	getImage,
+	type LocalImageProps,
+	type RemoteImageProps,
+} from 'astro:assets';
 import { AstroError, AstroErrorData } from '../dist/core/errors/index.js';
 import type { HTMLAttributes } from '../types';
 

packages/astro/components/Picture.astro

@@ -1,5 +1,9 @@
 ---
-import { getImage, type LocalImageProps, type RemoteImageProps } from 'astro:assets';
+import {
+	getImage,
+	type LocalImageProps,
+	type RemoteImageProps,
+} from 'astro:assets';
 import type { GetImageResult, ImageOutputFormat } from '../dist/@types/astro';
 import { isESMImportedImage } from '../dist/assets/utils/imageKind';
 import { AstroError, AstroErrorData } from '../dist/core/errors/index.js';

packages/astro/package.json

@@ -162,7 +162,6 @@
     "p-queue": "^8.0.1",
     "path-to-regexp": "^6.2.1",
     "preferred-pm": "^3.1.2",
-    "probe-image-size": "^7.2.3",
     "prompts": "^2.4.2",
     "rehype": "^13.0.1",
     "resolve": "^1.22.4",

packages/astro/src/assets/internal.ts

@@ -9,6 +9,7 @@ import type {
 	UnresolvedImageTransform,
 } from './types.js';
 import { isESMImportedImage, isRemoteImage } from './utils/imageKind.js';
+import { probe } from "./utils/remoteProbe.js"
 
 export async function getConfiguredImageService(): Promise<ImageService> {
 	if (!globalThis?.astroAsset?.imageService) {
@@ -61,6 +62,21 @@ export async function getImage(
 				: options.src,
 	};
 
+	// Infer size for remote images if inferSize is true
+	if (options.inferSize && isRemoteImage(resolvedOptions.src)) {
+		try {
+			const result = await probe(resolvedOptions.src); // Directly probe the image URL
+			resolvedOptions.width ??= result.width;
+			resolvedOptions.height ??= result.height;
+			delete resolvedOptions.inferSize; // Delete so it doesn't end up in the attributes
+		} catch {
+			throw new AstroError({
+				...AstroErrorData.FailedToFetchRemoteImageDimensions,
+				message: AstroErrorData.FailedToFetchRemoteImageDimensions.message(resolvedOptions.src),
+			});
+		}
+	}
+
 	const originalPath = isESMImportedImage(resolvedOptions.src)
 		? resolvedOptions.src.fsPath
 		: resolvedOptions.src;

packages/astro/src/assets/types.ts

@@ -59,6 +59,7 @@ export type SrcSetValue = UnresolvedSrcSetValue & {
  */
 export type UnresolvedImageTransform = Omit<ImageTransform, 'src'> & {
 	src: ImageMetadata | string | Promise<{ default: ImageMetadata }>;
+	inferSize?: boolean;
 };
 
 /**
@@ -176,16 +177,38 @@ export type LocalImageProps<T> = ImageSharedProps<T> & {
 	quality?: ImageQuality;
 };
 
-export type RemoteImageProps<T> = WithRequired<ImageSharedProps<T>, 'width' | 'height'> & {
-	/**
-	 * URL of a remote image. Can start with a protocol (ex: `https://`) or alternatively `/`, or `Astro.url`, for images in the `public` folder
-	 *
-	 * Remote images are not optimized, and require both `width` and `height` to be set.
-	 *
-	 * **Example**:
-	 * ```
-	 * <Image src="https://example.com/image.png" width={450} height={300} alt="..." />
-	 * ```
-	 */
-	src: string;
-};
+export type RemoteImageProps<T> =
+	| (ImageSharedProps<T> & {
+			/**
+			 * URL of a remote image. Can start with a protocol (ex: `https://`) or alternatively `/`, or `Astro.url`, for images in the `public` folder
+			 *
+			 * Remote images are not optimized, and require both `width` and `height` to be set.
+			 *
+			 * **Example**:
+			 * ```
+			 * <Image src="https://example.com/image.png" width={450} height={300} alt="..." />
+			 * ```
+			 */
+			src: string;
+			/**
+			 * When inferSize is true width and height are not required
+			 */
+			inferSize: true;
+	  })
+	| (WithRequired<ImageSharedProps<T>, 'width' | 'height'> & {
+			/**
+			 * URL of a remote image. Can start with a protocol (ex: `https://`) or alternatively `/`, or `Astro.url`, for images in the `public` folder
+			 *
+			 * Remote images are not optimized, and require both `width` and `height` to be set.
+			 *
+			 * **Example**:
+			 * ```
+			 * <Image src="https://example.com/image.png" width={450} height={300} alt="..." />
+			 * ```
+			 */
+			src: string;
+			/**
+			 * When inferSize is false or undefined width and height are required
+			 */
+			inferSize?: false | undefined;
+	  });

packages/astro/src/assets/utils/metadata.ts

@@ -1,15 +1,15 @@
-import probe from 'probe-image-size';
+
+import { lookup as probe } from '../utils/vendor/image-size/lookup.js'
 import { AstroError, AstroErrorData } from '../../core/errors/index.js';
 import type { ImageInputFormat, ImageMetadata } from '../types.js';
 
 export async function imageMetadata(
 	data: Uint8Array,
 	src?: string
 ): Promise<Omit<ImageMetadata, 'src' | 'fsPath'>> {
-	// @ts-expect-error probe-image-size types are wrong, it does accept Uint8Array. From the README: "Sync version can eat arrays, typed arrays and buffers."
-	const result = probe.sync(data);
+	const result = probe(data);
 
-	if (result === null) {
+	if (!result.height || !result.width || !result.type ) {
 		throw new AstroError({
 			...AstroErrorData.NoImageMetadata,
 			message: AstroErrorData.NoImageMetadata.message(src),

packages/astro/src/assets/utils/remoteProbe.ts

@@ -0,0 +1,48 @@
+
+import { lookup } from './vendor/image-size/lookup.js'
+import type { ISize } from './vendor/image-size/types/interface.ts';
+
+export async function probe(url: string): Promise<ISize> {
+	// Start fetching the image
+	const response = await fetch(url);
+	if (!response.body || !response.ok) {
+		throw new Error('Failed to fetch image');
+	}
+
+	const reader = response.body.getReader();
+
+	let done: boolean | undefined, value: Uint8Array;
+	let accumulatedChunks = new Uint8Array();
+
+	// Process the stream chunk by chunk
+	while (!done) {
+		const readResult = await reader.read();
+		done = readResult.done;
+
+		if (done) break;
+
+		if (readResult.value) {
+			value = readResult.value;
+
+			// Accumulate chunks
+			let tmp = new Uint8Array(accumulatedChunks.length + value.length);
+			tmp.set(accumulatedChunks, 0);
+			tmp.set(value, accumulatedChunks.length);
+			accumulatedChunks = tmp;
+
+			try {
+        // Attempt to determine the size with each new chunk
+        const dimensions = lookup(accumulatedChunks);
+        if (dimensions) {
+          await reader.cancel(); // stop stream as we have size now
+          return dimensions;
+        }
+      } catch (error) {
+        // This catch block is specifically for `sizeOf` failures,
+        // which might occur if the accumulated data isn't yet sufficient.
+      }
+		}
+	}
+
+	throw new Error('Failed to parse the size');
+}

packages/astro/src/assets/utils/vendor/image-size/LICENSE

@@ -0,0 +1,9 @@
+The MIT License (MIT)
+
+Copyright © 2013-Present Aditya Yadav, http://netroy.in
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

packages/astro/src/assets/utils/vendor/image-size/README.md

@@ -0,0 +1,3 @@
+This code comes from https://github.com/image-size/image-size/pull/370, and is slightly modified (all import statements have file extensions added to them). 
+
+The `fromFile` functionality has also been removed, as it was not being used. 

packages/astro/src/assets/utils/vendor/image-size/detector.ts

@@ -0,0 +1,25 @@
+import type { imageType } from './types/index.js'
+import { typeHandlers, types } from './types/index.js'
+
+// This map helps avoid validating for every single image type
+const firstBytes = new Map<number, imageType>([
+  [0x38, 'psd'],
+  [0x42, 'bmp'],
+  [0x44, 'dds'],
+  [0x47, 'gif'],
+  [0x49, 'tiff'],
+  [0x4d, 'tiff'],
+  [0x52, 'webp'],
+  [0x69, 'icns'],
+  [0x89, 'png'],
+  [0xff, 'jpg'],
+])
+
+export function detector(input: Uint8Array): imageType | undefined {
+  const byte = input[0]
+  const type = firstBytes.get(byte)
+  if (type && typeHandlers.get(type)!.validate(input)) {
+    return type
+  }
+  return types.find((fileType) => typeHandlers.get(fileType)!.validate(input))
+}

packages/astro/src/assets/utils/vendor/image-size/lookup.ts

@@ -0,0 +1,43 @@
+import type { imageType } from './types/index.js'
+import { typeHandlers } from './types/index.js'
+import { detector } from './detector.js'
+import type { ISizeCalculationResult } from './types/interface.ts'
+
+type Options = {
+  disabledTypes: imageType[]
+}
+
+const globalOptions: Options = {
+  disabledTypes: [],
+}
+
+/**
+ * Return size information based on an Uint8Array
+ *
+ * @param {Uint8Array} input
+ * @returns {ISizeCalculationResult}
+ */
+export function lookup(input: Uint8Array): ISizeCalculationResult {
+  // detect the file type... don't rely on the extension
+  const type = detector(input)
+
+  if (typeof type !== 'undefined') {
+    if (globalOptions.disabledTypes.indexOf(type) > -1) {
+      throw new TypeError('disabled file type: ' + type)
+    }
+
+    // find an appropriate handler for this file type
+    const size = typeHandlers.get(type)!.calculate(input)
+    if (size !== undefined) {
+      size.type = size.type ?? type
+      return size
+    }
+  }
+
+  // throw up, if we don't understand the file
+  throw new TypeError('unsupported file type: ' + type)
+}
+
+export const disableTypes = (types: imageType[]): void => {
+  globalOptions.disabledTypes = types
+}

packages/astro/src/assets/utils/vendor/image-size/types/bmp.ts

@@ -0,0 +1,11 @@
+import type { IImage } from './interface.ts'
+import { toUTF8String, readInt32LE, readUInt32LE } from './utils.js'
+
+export const BMP: IImage = {
+  validate: (input) => toUTF8String(input, 0, 2) === 'BM',
+
+  calculate: (input) => ({
+    height: Math.abs(readInt32LE(input, 22)),
+    width: readUInt32LE(input, 18),
+  }),
+}

packages/astro/src/assets/utils/vendor/image-size/types/cur.ts

@@ -0,0 +1,17 @@
+import type { IImage } from './interface.ts'
+import { ICO } from './ico.js'
+import { readUInt16LE } from './utils.js'
+
+const TYPE_CURSOR = 2
+export const CUR: IImage = {
+  validate(input) {
+    const reserved = readUInt16LE(input, 0)
+    const imageCount = readUInt16LE(input, 4)
+    if (reserved !== 0 || imageCount === 0) return false
+
+    const imageType = readUInt16LE(input, 2)
+    return imageType === TYPE_CURSOR
+  },
+
+  calculate: (input) => ICO.calculate(input),
+}

packages/astro/src/assets/utils/vendor/image-size/types/dds.ts

@@ -0,0 +1,11 @@
+import type { IImage } from './interface.ts'
+import { readUInt32LE } from './utils.js'
+
+export const DDS: IImage = {
+  validate: (input) => readUInt32LE(input, 0) === 0x20534444,
+
+  calculate: (input) => ({
+    height: readUInt32LE(input, 12),
+    width: readUInt32LE(input, 16),
+  }),
+}

packages/astro/src/assets/utils/vendor/image-size/types/gif.ts

@@ -0,0 +1,12 @@
+import type { IImage } from './interface.ts'
+import { toUTF8String, readUInt16LE } from './utils.js'
+
+const gifRegexp = /^GIF8[79]a/
+export const GIF: IImage = {
+  validate: (input) => gifRegexp.test(toUTF8String(input, 0, 6)),
+
+  calculate: (input) => ({
+    height: readUInt16LE(input, 8),
+    width: readUInt16LE(input, 6),
+  }),
+}