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<main><section>
<div class="space-y-2 flex-1"><div class="space-y-7" id="module_doc"><div class="markdown"><p>Fetches pages and images from other sites for link previews, the image proxy
and the Bandcamp resolver, without letting a user-supplied URL reach the
server's own network. Each hop must resolve to a public address, the whole
exchange has a deadline, and pages are read up to a cap.</p>
</div><section class="section" id="api&#x2F;remote&#x2F;fetch_ts_functions"><div>
<h2 class="anchorable mb-1"><a href="#api&#x2F;remote&#x2F;fetch_ts_functions" class="anchor" aria-label="Anchor" tabIndex="-1"><svg
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Functions</h2></div><div class="namespaceSection"><div id="namespace_fetchpage" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;fetchPage.html" title="fetchPage">
<span>fetchPage</span><span>(<span><span>url<span>: <span class="td-kw">string</span></span></span></span>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-ref">FetchedPage</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Fetches a page for its link preview, through <a href="../../.././api/remote/fetch.ts/~/fetchWithTimeout.html">fetchWithTimeout</a>. A
response that isn't HTML is cancelled unread.</p>
</div></div></div>
</div><div id="namespace_fetchwithtimeout" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;fetchWithTimeout.html" title="fetchWithTimeout">
<span>fetchWithTimeout</span><span>(<div class="ml-4"><div><span>url<span>: <span class="td-kw">string</span></span></span>,</div><div><span>timeoutMs<span class="td-op">?</span><span>: <span class="td-kw">number</span></span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-ref">Response</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Fetches a user-supplied URL, following up to five redirects, each of which
must resolve to a public address too. <code>timeoutMs</code> bounds each hop, body
included. The caller must read or cancel the body, or its connection stays
open.</p>
</div></div></div>
</div><div id="namespace_isvalidhttpurl" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;isValidHttpUrl.html" title="isValidHttpUrl">
<span>isValidHttpUrl</span><span>(<span><span>raw<span>: <span class="td-kw">string</span></span></span></span>)<span>: <span class="td-kw">boolean</span></span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Checks whether <code>raw</code> is an http(s) URL on a host that isn't private, or a
link to one of this site's own pages. Routes and services check a URL with it
before storing, previewing or proxying it; it does no DNS lookup, which
<a href="../../.././api/remote/fetch.ts/~/fetchWithTimeout.html">fetchWithTimeout</a> does.</p>
</div></div></div>
</div><div id="namespace_readbytescapped" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;readBytesCapped.html" title="readBytesCapped">
<span>readBytesCapped</span><span>(<div class="ml-4"><div><span>res<span>: <span class="td-ref">Response</span></span></span>,</div><div><span>maxBytes<span>: <span class="td-kw">number</span></span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-ref">Uint8Array</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Reads the body of <code>res</code> up to <code>maxBytes</code>; the rest is cancelled, never
downloaded. The image proxy reads through it, and <a href="../../.././api/remote/fetch.ts/~/readTextCapped.html">readTextCapped</a>.</p>
</div></div></div>
</div><div id="namespace_readtextcapped" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;readTextCapped.html" title="readTextCapped">
<span>readTextCapped</span><span>(<div class="ml-4"><div><span>res<span>: <span class="td-ref">Response</span></span></span>,</div><div><span>maxBytes<span class="td-op">?</span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-kw">string</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Reads the body of <code>res</code> as text, up to <code>maxBytes</code>, in the charset the page
declares; the rest is cancelled, never downloaded. <a href="../../.././api/remote/fetch.ts/~/fetchPage.html">fetchPage</a> and the
Bandcamp and YouTube resolvers read pages through it.</p>
</div></div></div>
</div></div>
</section>
<section class="section" id="api&#x2F;remote&#x2F;fetch_ts_interfaces"><div>
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Interfaces</h2></div><div class="namespaceSection"><div id="namespace_fetchedpage" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Interface bg-Interface/15 dark:text-InterfaceDark dark:bg-InterfaceDark/15" title="Interface">I</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;FetchedPage.html" title="FetchedPage">
<span>FetchedPage</span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Returned by <a href="../../.././api/remote/fetch.ts/~/fetchPage.html">fetchPage</a> to the link preview providers.</p>
</div></div><ul class="namespaceItemContentSubItems"><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;FetchedPage.html#property_html">
<span>html</span><span>: <span class="td-kw">string</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>The page's text, up to <a href="../../.././api/remote/fetch.ts/~/MAX_PAGE_BYTES.html">MAX_PAGE_BYTES</a>; missing when it isn't HTML.</p>
</div></div></li><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;FetchedPage.html#property_url">
<span>url</span><span>: <span class="td-kw">string</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>The URL the page was served from, after redirects: the base its relative
links resolve against.</p>
</div></div></li></ul></div>
</div></div>
</section>
<section class="section" id="api&#x2F;remote&#x2F;fetch_ts_variables"><div>
<h2 class="anchorable mb-1"><a href="#api&#x2F;remote&#x2F;fetch_ts_variables" class="anchor" aria-label="Anchor" tabIndex="-1"><svg
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height="16"
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Variables</h2></div><div class="namespaceSection"><div id="namespace_max_page_bytes" class="namespaceItem" ><div class="docNodeKindIcon"><div class="text-Variable bg-Variable/15 dark:text-VariableDark dark:bg-VariableDark/15" title="Variable">v</div></div>
<div class="namespaceItemContent">
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;remote&#x2F;fetch.ts&#x2F;~&#x2F;MAX_PAGE_BYTES.html" title="MAX_PAGE_BYTES">
<span>MAX_PAGE_BYTES</span><span>: <span class="td-kw">number</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>The default cap of <a href="../../.././api/remote/fetch.ts/~/readTextCapped.html">readTextCapped</a>. The metadata previews read is in
the <code>&lt;head&gt;</code>, and a page past this is a download.</p>
</div></div></div>
</div></div>
</section>
</div>
</div>
</section>
</main><div class="toc">
<div><div class="usageContent">
<h3>Usage</h3><div class="markdown"><pre class="highlight"><code class="language-typescript">import * as mod from &quot;api/remote/fetch.ts&quot;;
</code><button class="copyButton" data-copy="import * as mod from &quot;api/remote/fetch.ts&quot;;
"><svg
class="copy"
width="15"
height="15"
viewBox="0 0 15 15"
fill="none"
xmlns="http://www.w3.org/2000/svg"
>
<rect x="2" y="2" width="7" height="7" fill="none" />
<rect x="6" y="6" width="7" height="7" fill="none" />
<path
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<svg
class="check"
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viewBox="0 0 24 24"
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stroke-linecap="round"
stroke-linejoin="round"
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<path d="M5 12l5 5l10 -10" />
</svg>
</button><code></code></pre>
</div></div><nav class="topSymbols">
<h3>Symbols</h3>
<ul><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;middleware&#x2F;auth.ts&#x2F;~&#x2F;AuthState.html" title="AuthState"><div class="docNodeKindIcon"><div class="text-Interface bg-Interface/15 dark:text-InterfaceDark dark:bg-InterfaceDark/15" title="Interface">I</div></div>
<span class="hover:bg-Interface/15 hover:bg-InterfaceDark/15">
AuthState
</span>
</a>
</li><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;middleware&#x2F;auth.ts&#x2F;~&#x2F;AuthContext.html" title="AuthContext"><div class="docNodeKindIcon"><div class="text-TypeAlias bg-TypeAlias/15 dark:text-TypeAliasDark dark:bg-TypeAliasDark/15" title="Type Alias">T</div></div>
<span class="hover:bg-TypeAlias/15 hover:bg-TypeAliasDark/15">
AuthContext
</span>
</a>
</li><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;middleware&#x2F;auth.ts&#x2F;~&#x2F;authMiddleware.html" title="authMiddleware"><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<span class="hover:bg-Function/15 hover:bg-FunctionDark/15">
authMiddleware
</span>
</a>
</li><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;middleware&#x2F;auth.ts&#x2F;~&#x2F;requirePermission.html" title="requirePermission"><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<span class="hover:bg-Function/15 hover:bg-FunctionDark/15">
requirePermission
</span>
</a>
</li><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;middleware&#x2F;error.ts&#x2F;~&#x2F;errorMiddleware.html" title="errorMiddleware"><div class="docNodeKindIcon"><div class="text-Function bg-Function/15 dark:text-FunctionDark dark:bg-FunctionDark/15" title="Function">f</div></div>
<span class="hover:bg-Function/15 hover:bg-FunctionDark/15">
errorMiddleware
</span>
</a>
</li></ul><a class="flex items-center gap-0.5" href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;all_symbols.html">
<span class="leading-none">view all 1307 symbols</span><svg
width="16"
height="16"
viewBox="0 0 16 16"
fill="none"
xmlns="http://www.w3.org/2000/svg"
>
<path
fill-rule="evenodd"
clip-rule="evenodd"
d="M5.76748 11.8159C5.5378 11.577 5.54525 11.1972 5.78411 10.9675L8.93431 8L5.78411 5.0325C5.54525 4.80282 5.5378 4.423 5.76748 4.18413C5.99715 3.94527 6.37698 3.93782 6.61584 4.1675L10.2158 7.5675C10.3335 7.68062 10.4 7.83679 10.4 8C10.4 8.16321 10.3335 8.31938 10.2158 8.4325L6.61584 11.8325C6.37698 12.0622 5.99715 12.0547 5.76748 11.8159Z"
fill="currentColor"
/>
</svg>
</a></nav><nav class="documentNavigation">
<h3>Document Navigation</h3><ul><li><a href="#api/remote/fetch_ts_functions" title="Functions">Functions</a></li><li><ul><li><a href="#namespace_fetchpage" title="fetchPage">fetchPage</a></li><li><a href="#namespace_fetchwithtimeout" title="fetchWithTimeout">fetchWithTimeout</a></li><li><a href="#namespace_isvalidhttpurl" title="isValidHttpUrl">isValidHttpUrl</a></li><li><a href="#namespace_readbytescapped" title="readBytesCapped">readBytesCapped</a></li><li><a href="#namespace_readtextcapped" title="readTextCapped">readTextCapped</a></li></ul></li><li><a href="#api/remote/fetch_ts_interfaces" title="Interfaces">Interfaces</a></li><li><ul><li><a href="#namespace_fetchedpage" title="FetchedPage">FetchedPage</a></li></ul></li><li><a href="#api/remote/fetch_ts_variables" title="Variables">Variables</a></li><li><ul><li><a href="#namespace_max_page_bytes" title="MAX_PAGE_BYTES">MAX_PAGE_BYTES</a></li></ul></li></ul></nav></div>
</div></div>
</div>
</div>
</body>
</html>