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import { read_implementation, manifest } from '__sveltekit/server';
import { base } from '__sveltekit/paths';
import { DEV } from 'esm-env';
import { b64_decode } from '../../utils.js';
/**
* Read the contents of an imported asset from the filesystem
* @example
* ```js
* import { read } from '$app/server';
* import somefile from './somefile.txt';
*
* const asset = read(somefile);
* const text = await asset.text();
* ```
* @param {string} asset
* @returns {Response}
* @since 2.4.0
*/
export function read(asset) {
__SVELTEKIT_TRACK__('$app/server:read');
if (!read_implementation) {
throw new Error(
'No `read` implementation was provided. Please ensure that your adapter is up to date and supports this feature'
);
}
// handle inline assets internally
const match = /^data:([^;,]+)?(;base64)?,/.exec(asset);
if (match) {
const type = match[1] ?? 'application/octet-stream';
const data = asset.slice(match[0].length);
if (match[2] !== undefined) {
const decoded = b64_decode(data);
return new Response(decoded, {
headers: {
'Content-Length': decoded.byteLength.toString(),
'Content-Type': type
}
});
}
const decoded = decodeURIComponent(data);
return new Response(decoded, {
headers: {
'Content-Length': decoded.length.toString(),
'Content-Type': type
}
});
}
const file = decodeURIComponent(
DEV && asset.startsWith('/@fs') ? asset : asset.slice(base.length + 1)
);
if (file in manifest._.server_assets) {
const length = manifest._.server_assets[file];
const type = manifest.mimeTypes[file.slice(file.lastIndexOf('.'))];
return new Response(read_implementation(file), {
headers: {
'Content-Length': '' + length,
'Content-Type': type
}
});
}
throw new Error(`Asset does not exist: ${file}`);
}
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