Chrome - Fetch API cannot load file. How to workaround?
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<span>2020-12-02 00:33</span>
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<p>For chrome you still need <code>--allow-file-access-from-files</code> (and I recommend installing a separate chrome and using it solely for these projects to stay secure), but just shim <code>fetch()</code> for <code>XMLHttpRequest</code> for <code>file://</code> requests:</p>
<pre class="lang-js prettyprint-override"><code>if (/^file:\/\/\//.test(location.href)) {
let path = './';
let orig = fetch;
window.fetch = (resource) => ((/^[^/:]*:/.test(resource)) ?
orig(resource) :
new Promise(function(resolve, reject) {
let request = new XMLHttpRequest();
let fail = (error) => {reject(error)};
['error', 'abort'].forEach((event) => { request.addEventListener(event, fail); });
let pull = (expected) => (new Promise((resolve, reject) => {
if (
request.responseType == expected ||
(expected == 'text' && !request.responseType)
)
resolve(request.response);
else
reject(request.responseType);
}));
request.addEventListener('load', () => (resolve({
arrayBuffer : () => (pull('arraybuffer')),
blob : () => (pull('blob')),
text : () => (pull('text')),
json : () => (pull('json'))
})));
request.open('GET', resource.replace(/^\//, path));
request.send();
})
);
}
</code></pre>
<p>This shim will;</p>
<ul>
<li>only activate for html files opened locally (outer <code>if</code> statement),</li>
<li>call the normal <code>fetch()</code> for any url that doesn't specify protocol (and thus non-<code>file://</code> requests), and</li>
<li>will replace absolute paths (<code>/root/bob.html</code>) with ones relative to the current path (since that would dangerously evaluate to <code>C:\</code> or equivalent)</li>
</ul>
<p>Set <code>path</code> to something else if your <code>index.html</code> isn't actually at the root for the project.<br>
If you need support for init, or anything other than <code>text()</code>, you'll need to add it.<br>
Explicit <code>file://</code> requests wont be fulfilled, that's on purpose, but if you <em>really</em> do know what you're doing, you'll know how to make this work for you, and if you don't you shouldn't.</p>
<hr>
<p>The following is useful if you're going to be doing this for multiple files. Swap out <code>'./'</code> for <code>document.currentScript.getAttribute('data-root')</code>. Now you can put that snippet into its own file, say <code>filesystemHelper.js</code>, and call like so in the various files:</p>
<pre class="lang-html prettyprint-override"><code><script src="../filesystemHelper.js" data-root="../"></script>
</code></pre>
<p>Pretty snazzy.</p>
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