Port and re-write icon code.

src/components/common/ServerIcon.tsx

@@ -0,0 +1,57 @@
+import styled from "styled-components";
+import { useContext } from "preact/hooks";
+import { Server } from "revolt.js/dist/api/objects";
+import IconBase, { IconBaseProps } from "./IconBase";
+import { AppContext } from "../../context/revoltjs/RevoltClient";
+
+interface Props extends IconBaseProps<Server> {
+    server_name?: string;
+}
+
+const ServerText = styled.div`
+    display: grid;
+    padding: .2em;
+    overflow: hidden;
+    border-radius: 50%;
+    place-items: center;
+    color: var(--foreground);
+    background: var(--primary-background);
+`;
+
+const fallback = '/assets/group.png';
+export default function ServerIcon(props: Props & Omit<JSX.SVGAttributes<SVGSVGElement>, keyof Props>) {
+    const { client } = useContext(AppContext);
+
+    const { target, attachment, size, animate, server_name, children, as, ...svgProps } = props;
+    const iconURL = client.generateFileURL(target?.icon ?? attachment, { max_side: 256 }, animate);
+
+    if (typeof iconURL === 'undefined') {
+        const name = target?.name ?? server_name ?? '';
+
+        return (
+            <ServerText style={{ width: size, height: size }}>
+                { name.split(' ')
+                      .map(x => x[0])
+                      .filter(x => typeof x !== 'undefined') }
+            </ServerText>
+        )
+    }
+
+    return (
+        <IconBase {...svgProps}
+            width={size}
+            height={size}
+            aria-hidden="true"
+            viewBox="0 0 32 32">
+            <foreignObject x="0" y="0" width="32" height="32">
+                <img src={iconURL}
+                    onError={ e => {
+                        let el = e.currentTarget;
+                        if (el.src !== fallback) {
+                            el.src = fallback
+                        }
+                    }} />
+            </foreignObject>
+        </IconBase>
+    );
+}