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<div class="space-y-2 flex-1"><div class="space-y-7" id="module_doc"><div class="markdown"><p>Checks the images users upload and serves them back, scaled down to the
width a request names. The avatar, playlist cover, dump thumbnail and
attachment routes call it.</p>
</div><section class="section" id="api&#x2F;lib&#x2F;upload_ts_functions"><div>
<h2 class="anchorable mb-1"><a href="#api&#x2F;lib&#x2F;upload_ts_functions" class="anchor" aria-label="Anchor" tabIndex="-1"><svg
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Functions</h2></div><div class="namespaceSection"><div id="namespace_detectimagemime" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;detectImageMime.html" title="detectImageMime">
<span>detectImageMime</span><span>(<span><span>data<span>: <span class="td-ref">Uint8Array</span></span></span></span>)<span>: <span><span class="td-kw">string</span><span class="td-op"> | </span><span class="td-kw">null</span></span></span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Returns the MIME type of a JPEG, PNG, GIF or WebP image from its magic
bytes, or null for anything else. These four are the only image types
accepted anywhere. The type the browser declared is never
trusted, since the file is later served with the type found here.</p>
</div></div></div>
</div><div id="namespace_replaceuploadedfile" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;replaceUploadedFile.html" title="replaceUploadedFile">
<span>replaceUploadedFile</span><span>(<div class="ml-4"><div><span>filePath<span>: <span class="td-kw">string</span></span></span>,</div><div><span>data<span>: <span class="td-ref">Uint8Array</span></span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-kw">void</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Writes <code>data</code> to <code>filePath</code>, replacing whatever is there only once the whole
file is written, so a failed write leaves the old file whole. The upload
routes call it before recording the new file, so that clients told of it
never fetch it early.</p>
</div></div></div>
</div><div id="namespace_scalableimage" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;scalableImage.html" title="scalableImage">
<span>scalableImage</span><span>(<span><span>head<span>: <span class="td-ref">Uint8Array</span></span></span></span>)<span>: <span><span class="td-ref">ScalableImage</span><span class="td-op"> | </span><span class="td-kw">null</span></span></span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Returns how to scale the image whose first IMAGE_HEAD_BYTES are
<code>head</code>, or null when it is to be served as it is: an animated WebP, which
ffmpeg can't read, or anything but a JPEG, PNG, GIF, WebP or BMP.</p>
</div></div></div>
</div><div id="namespace_serveimage" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;serveImage.html" title="serveImage">
<span>serveImage</span><span>(<div class="ml-4"><div><span>ctx<span>: <span class="td-ref">Context</span></span></span>,</div><div><span>path<span>: <span class="td-kw">string</span></span></span>,</div><div><span>mime<span>: <span class="td-kw">string</span></span></span>,</div><div><span>cacheControl<span>: <span class="td-kw">string</span></span></span>,</div><div><span>defaultWidth<span class="td-op">?</span><span>: <span class="td-ref">ImageWidth</span></span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-kw">boolean</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Sends the image at <code>path</code>, of type <code>mime</code>, with <code>cacheControl</code>: a WebP copy
at most as wide as the request's <code>?w=</code> names (<code>shared/image.ts</code>), or as
<code>defaultWidth</code> without one, and the image as it is when the request names
no width or the copy can't be made. With <code>?f=compat</code>, the copy is a JPEG,
or a PNG for an image that may be transparent, which the digest's emails
ask for, since not every mail client reads WebP. Every route that answers
one of the site's own images ends here, so each takes both. It resolves
false, having sent nothing, when the file is missing.</p>
</div></div></div>
</div><div id="namespace_serveuploadedfile" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;serveUploadedFile.html" title="serveUploadedFile">
<span>serveUploadedFile</span><span>(<div class="ml-4"><div><span>ctx<span>: <span class="td-ref">Context</span></span></span>,</div><div><span>filePath<span>: <span class="td-kw">string</span></span></span>,</div><div><span>mime<span>: <span class="td-kw">string</span></span></span>,</div><div><span>cacheMaxAge<span class="td-op">?</span><span>: <span class="td-kw">number</span></span></span>,</div><div><span>isPrivate<span class="td-op">?</span><span>: <span class="td-kw">boolean</span></span></span>,</div><div><span>defaultWidth<span class="td-op">?</span><span>: <span class="td-ref">ImageWidth</span></span></span></div></div>)<span>: <span class="td-ref">Promise</span>&lt;<span class="td-kw">boolean</span>&gt;</span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Serves an uploaded image inline as <code>mime</code>, or scaled down as
<a href="../../.././api/lib/upload.ts/~/serveImage.html">serveImage</a> does, cached for <code>cacheMaxAge</code> seconds, and only by the
browser when <code>isPrivate</code>. It answers 404 and resolves false when the file
is missing. The caller checks first that the viewer may see it.</p>
</div></div></div>
</div><div id="namespace_validateimageupload" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;validateImageUpload.html" title="validateImageUpload">
<span>validateImageUpload</span><span>(<span><span>data<span>: <span class="td-ref">Uint8Array</span></span></span></span>)<span>: <span class="td-kw">string</span></span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Checks an uploaded image's size and content, and returns its MIME type,
which the route stores to serve the image with.</p>
</div></div></div>
</div></div>
</section>
<section class="section" id="api&#x2F;lib&#x2F;upload_ts_interfaces"><div>
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Interfaces</h2></div><div class="namespaceSection"><div id="namespace_scalableimage-1" 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;lib&#x2F;upload.ts&#x2F;~&#x2F;ScalableImage.html" title="ScalableImage">
<span>ScalableImage</span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>Returned by <a href="../../.././api/lib/upload.ts/~/scalableImage.html">scalableImage</a>, for <code>scaleImage</code>.</p>
</div></div><ul class="namespaceItemContentSubItems"><li>
<a href="..&#x2F;..&#x2F;..&#x2F;.&#x2F;api&#x2F;lib&#x2F;upload.ts&#x2F;~&#x2F;ScalableImage.html#property_compat">
<span>compat</span><span>: <span><span class="td-str">"jpg"</span><span class="td-op"> | </span><span class="td-str">"png"</span></span></span></a><div class="namespaceItemContentDoc"><div class="markdown_summary"><p>The format of its copy for a reader without WebP: a JPEG, or a PNG for
an image that may be transparent, which a JPEG would fill with black.</p>
</div></div></li></ul></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/lib/upload.ts&quot;;
</code><button class="copyButton" data-copy="import * as mod from &quot;api/lib/upload.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
d="M1.55566 2.7C1.55566 2.03726 2.09292 1.5 2.75566 1.5H8.75566C9.41841 1.5 9.95566 2.03726 9.95566 2.7V5.1H12.3557C13.0184 5.1 13.5557 5.63726 13.5557 6.3V12.3C13.5557 12.9627 13.0184 13.5 12.3557 13.5H6.35566C5.69292 13.5 5.15566 12.9627 5.15566 12.3V9.9H2.75566C2.09292 9.9 1.55566 9.36274 1.55566 8.7V2.7ZM6.35566 9.9V12.3H12.3557V6.3H9.95566V8.7C9.95566 9.36274 9.41841 9.9 8.75566 9.9H6.35566ZM8.75566 8.7V2.7H2.75566V8.7H8.75566Z"
fill="currentColor"
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</svg>
<svg
class="check"
width="15"
height="15"
viewBox="0 0 24 24"
stroke-width="2"
stroke="currentColor"
fill="none"
stroke-linecap="round"
stroke-linejoin="round"
xmlns="http://www.w3.org/2000/svg"
>
<path stroke="none" d="M0 0h24v24H0z" fill="none" />
<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/lib/upload_ts_functions" title="Functions">Functions</a></li><li><ul><li><a href="#namespace_detectimagemime" title="detectImageMime">detectImageMime</a></li><li><a href="#namespace_replaceuploadedfile" title="replaceUploadedFile">replaceUploadedFile</a></li><li><a href="#namespace_scalableimage" title="scalableImage">scalableImage</a></li><li><a href="#namespace_serveimage" title="serveImage">serveImage</a></li><li><a href="#namespace_serveuploadedfile" title="serveUploadedFile">serveUploadedFile</a></li><li><a href="#namespace_validateimageupload" title="validateImageUpload">validateImageUpload</a></li></ul></li><li><a href="#api/lib/upload_ts_interfaces" title="Interfaces">Interfaces</a></li><li><ul><li><a href="#namespace_scalableimage-1" title="ScalableImage">ScalableImage</a></li></ul></li></ul></nav></div>
</div></div>
</div>
</div>
</body>
</html>