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import type { AstroConfig } from 'astro';
import MagicString from 'magic-string';
import mime from 'mime';
import fs from 'node:fs/promises';
import { basename, extname } from 'node:path';
import { Readable } from 'node:stream';
import { pathToFileURL } from 'node:url';
import type { Plugin, ResolvedConfig } from 'vite';
import type { IntegrationOptions } from './index.js';
import type { InputFormat } from './loaders/index.js';
import { metadata } from './utils/metadata.js';
import { appendForwardSlash } from './utils/paths.js';
export interface ImageMetadata {
src: string;
width: number;
height: number;
format: InputFormat;
}
export function createPlugin(config: AstroConfig, options: Required<IntegrationOptions>): Plugin {
const filter = (id: string) =>
/^(?!\/_image?).*.(heic|heif|avif|jpeg|jpg|png|tiff|webp|gif|svg)$/.test(id);
const virtualModuleId = 'virtual:image-loader';
let resolvedConfig: ResolvedConfig;
return {
name: '@astrojs/image',
enforce: 'pre',
configResolved(viteConfig) {
resolvedConfig = viteConfig;
},
async resolveId(id) {
// The virtual model redirects imports to the ImageService being used
// This ensures the module is available in `astro dev` and is included
// in the SSR server bundle.
if (id === virtualModuleId) {
return await this.resolve(options.serviceEntryPoint);
}
},
async load(id) {
// only claim image ESM imports
if (!filter(id)) {
return null;
}
const url = pathToFileURL(id);
const meta = await metadata(url);
if (!meta) {
return;
}
if (!this.meta.watchMode) {
const pathname = decodeURI(url.pathname);
const filename = basename(pathname, extname(pathname) + `.${meta.format}`);
const handle = this.emitFile({
name: filename,
source: await fs.readFile(url),
type: 'asset',
});
meta.src = `__ASTRO_IMAGE_ASSET__${handle}__`;
} else {
meta.src = '/@astroimage' + url.pathname;
}
return `export default ${JSON.stringify(meta)}`;
},
configureServer(server) {
server.middlewares.use(async (req, res, next) => {
if (req.url?.startsWith('/@astroimage/')) {
// Reconstructing URL to get rid of query parameters in path
const url = new URL(req.url.slice('/@astroimage'.length), 'file:');
const file = await fs.readFile(url);
const meta = await metadata(url);
if (!meta) {
return next();
}
const transform = await globalThis.astroImage.defaultLoader.parseTransform(
url.searchParams
);
// if no transforms were added, the original file will be returned as-is
let data = file;
let format = meta.format;
if (transform) {
const result = await globalThis.astroImage.defaultLoader.transform(file, transform);
data = result.data;
format = result.format;
}
res.setHeader('Content-Type', mime.getType(format) || '');
res.setHeader('Cache-Control', 'max-age=360000');
const stream = Readable.from(data);
return stream.pipe(res);
}
return next();
});
},
async renderChunk(code) {
const assetUrlRE = /__ASTRO_IMAGE_ASSET__([a-z\d]{8})__(?:_(.*?)__)?/g;
let match;
let s;
while ((match = assetUrlRE.exec(code))) {
s = s || (s = new MagicString(code));
const [full, hash, postfix = ''] = match;
const file = this.getFileName(hash);
const prefix = config.build.assetsPrefix
? appendForwardSlash(config.build.assetsPrefix)
: config.base;
const outputFilepath = prefix + file + postfix;
s.overwrite(match.index, match.index + full.length, outputFilepath);
}
if (s) {
return {
code: s.toString(),
map: resolvedConfig.build.sourcemap ? s.generateMap({ hires: true }) : null,
};
} else {
return null;
}
},
};
}
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