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import type { ExternalImageService } from 'astro';
import { baseService } from 'astro/assets';
import { isESMImportedImage, sharedValidateOptions } from './shared.js';
const service: ExternalImageService = {
...baseService,
validateOptions: (options, serviceOptions) =>
sharedValidateOptions(options, serviceOptions.service.config, 'production'),
getHTMLAttributes(options) {
const { inputtedWidth, ...props } = options;
// If `validateOptions` returned a different width than the one of the image, use it for attributes
if (inputtedWidth) {
props.width = inputtedWidth;
}
let targetWidth = props.width;
let targetHeight = props.height;
if (isESMImportedImage(props.src)) {
const aspectRatio = props.src.width / props.src.height;
if (targetHeight && !targetWidth) {
// If we have a height but no width, use height to calculate the width
targetWidth = Math.round(targetHeight * aspectRatio);
} else if (targetWidth && !targetHeight) {
// If we have a width but no height, use width to calculate the height
targetHeight = Math.round(targetWidth / aspectRatio);
} else if (!targetWidth && !targetHeight) {
// If we have neither width or height, use the original image's dimensions
targetWidth = props.src.width;
targetHeight = props.src.height;
}
}
const { src, width, height, format, quality, densities, widths, formats, ...attributes } =
options;
return {
...attributes,
width: targetWidth,
height: targetHeight,
loading: attributes.loading ?? 'lazy',
decoding: attributes.decoding ?? 'async',
};
},
getURL(options) {
const fileSrc = isESMImportedImage(options.src)
? removeLeadingForwardSlash(options.src.src)
: options.src;
const searchParams = new URLSearchParams();
searchParams.append('url', fileSrc);
options.width && searchParams.append('w', options.width.toString());
options.quality && searchParams.append('q', options.quality.toString());
return '/_vercel/image?' + searchParams;
},
};
function removeLeadingForwardSlash(path: string) {
return path.startsWith('/') ? path.substring(1) : path;
}
export default service;
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