[Artifacts] add preview html code

app/api/artifact/route.ts

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+import md5 from "spark-md5";
+import { NextRequest, NextResponse } from "next/server";
+import { getServerSideConfig } from "@/app/config/server";
+
+async function handle(req: NextRequest, res: NextResponse) {
+  const serverConfig = getServerSideConfig();
+  const storeUrl = () =>
+    `https://api.cloudflare.com/client/v4/accounts/${serverConfig.cloudflareAccountId}/storage/kv/namespaces/${serverConfig.cloudflareKVNamespaceId}`;
+  const storeHeaders = () => ({
+    Authorization: `Bearer ${serverConfig.cloudflareKVApiKey}`,
+  });
+  if (req.method === "POST") {
+    const clonedBody = await req.text();
+    const hashedCode = md5.hash(clonedBody).trim();
+    const body: {
+      key: string;
+      value: string;
+      expiration_ttl?: number;
+    } = {
+      key: hashedCode,
+      value: clonedBody,
+    };
+    try {
+      const ttl = parseInt(serverConfig.cloudflareKVTTL as string);
+      if (ttl > 60) {
+        body["expiration_ttl"] = ttl;
+      }
+    } catch (e) {
+      console.error(e);
+    }
+    const res = await fetch(`${storeUrl()}/bulk`, {
+      headers: {
+        ...storeHeaders(),
+        "Content-Type": "application/json",
+      },
+      method: "PUT",
+      body: JSON.stringify([body]),
+    });
+    const result = await res.json();
+    console.log("save data", result);
+    if (result?.success) {
+      return NextResponse.json(
+        { code: 0, id: hashedCode, result },
+        { status: res.status },
+      );
+    }
+    return NextResponse.json(
+      { error: true, msg: "Save data error" },
+      { status: 400 },
+    );
+  }
+  if (req.method === "GET") {
+    const id = req?.nextUrl?.searchParams?.get("id");
+    const res = await fetch(`${storeUrl()}/values/${id}`, {
+      headers: storeHeaders(),
+      method: "GET",
+    });
+    return new Response(res.body, {
+      status: res.status,
+      statusText: res.statusText,
+      headers: res.headers,
+    });
+  }
+  return NextResponse.json(
+    { error: true, msg: "Invalid request" },
+    { status: 400 },
+  );
+}
+
+export const POST = handle;
+export const GET = handle;
+
+export const runtime = "edge";

app/components/artifact.module.scss

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+.artifact {
+  display: flex;
+  width: 100%;
+  height: 100%;
+  flex-direction: column;
+  &-header {
+    display: flex;
+    align-items: center;
+    height: 36px;
+    padding: 20px;
+    background: var(--second);
+  }
+  &-title {
+    flex: 1;
+    text-align: center;
+    font-weight: bold;
+    font-size: 24px;
+  }
+  &-content {
+    flex-grow: 1;
+    padding: 0 20px 20px 20px;
+    background-color: var(--second);
+  }
+}
+
+.artifact-iframe {
+  width: 100%;
+  border: var(--border-in-light);
+  border-radius: 6px;
+}

app/components/artifact.tsx

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+import { useEffect, useState, useRef, useMemo } from "react";
+import { useParams } from "react-router";
+import { useWindowSize } from "@/app/utils";
+import { IconButton } from "./button";
+import { nanoid } from "nanoid";
+import ExportIcon from "../icons/share.svg";
+import CopyIcon from "../icons/copy.svg";
+import DownloadIcon from "../icons/download.svg";
+import GithubIcon from "../icons/github.svg";
+import LoadingButtonIcon from "../icons/loading.svg";
+import Locale from "../locales";
+import { Modal, showToast } from "./ui-lib";
+import { copyToClipboard, downloadAs } from "../utils";
+import { Path, ApiPath, REPO_URL } from "@/app/constant";
+import { Loading } from "./home";
+import styles from "./artifact.module.scss";
+
+export function HTMLPreview(props: {
+  code: string;
+  autoHeight?: boolean;
+  height?: number | string;
+  onLoad?: (title?: string) => void;
+}) {
+  const ref = useRef<HTMLIFrameElement>(null);
+  const frameId = useRef<string>(nanoid());
+  const [iframeHeight, setIframeHeight] = useState(600);
+  const [title, setTitle] = useState("");
+  /*
+   * https://stackoverflow.com/questions/19739001/what-is-the-difference-between-srcdoc-and-src-datatext-html-in-an
+   * 1. using srcdoc
+   * 2. using src with dataurl:
+   *    easy to share
+   *    length limit (Data URIs cannot be larger than 32,768 characters.)
+   */
+
+  useEffect(() => {
+    const handleMessage = (e: any) => {
+      const { id, height, title } = e.data;
+      setTitle(title);
+      if (id == frameId.current) {
+        setIframeHeight(height);
+      }
+    };
+    window.addEventListener("message", handleMessage);
+    return () => {
+      window.removeEventListener("message", handleMessage);
+    };
+  }, []);
+
+  const height = useMemo(() => {
+    const parentHeight = props.height || 600;
+    if (props.autoHeight !== false) {
+      return iframeHeight + 40 > parentHeight
+        ? parentHeight
+        : iframeHeight + 40;
+    } else {
+      return parentHeight;
+    }
+  }, [props.autoHeight, props.height, iframeHeight]);
+
+  const srcDoc = useMemo(() => {
+    const script = `<script>new ResizeObserver((entries) => parent.postMessage({id: '${frameId.current}', height: entries[0].target.clientHeight}, '*')).observe(document.body)</script>`;
+    if (props.code.includes("</head>")) {
+      props.code.replace("</head>", "</head>" + script);
+    }
+    return props.code + script;
+  }, [props.code]);
+
+  const handleOnLoad = () => {
+    if (props?.onLoad) {
+      props.onLoad(title);
+    }
+  };
+
+  return (
+    <iframe
+      className={styles["artifact-iframe"]}
+      id={frameId.current}
+      ref={ref}
+      sandbox="allow-forms allow-modals allow-scripts"
+      style={{ height }}
+      srcDoc={srcDoc}
+      onLoad={handleOnLoad}
+    />
+  );
+}
+
+export function ArtifactShareButton({
+  getCode,
+  id,
+  style,
+  fileName,
+}: {
+  getCode: () => string;
+  id?: string;
+  style?: any;
+  fileName?: string;
+}) {
+  const [loading, setLoading] = useState(false);
+  const [name, setName] = useState(id);
+  const [show, setShow] = useState(false);
+  const shareUrl = useMemo(
+    () => [location.origin, "#", Path.Artifact, "/", name].join(""),
+    [name],
+  );
+  const upload = (code: string) =>
+    id
+      ? Promise.resolve({ id })
+      : fetch(ApiPath.Artifact, {
+          method: "POST",
+          body: code,
+        })
+          .then((res) => res.json())
+          .then(({ id }) => {
+            if (id) {
+              return { id };
+            }
+            throw Error();
+          })
+          .catch((e) => {
+            showToast(Locale.Export.Artifact.Error);
+          });
+  return (
+    <>
+      <div className="window-action-button" style={style}>
+        <IconButton
+          icon={loading ? <LoadingButtonIcon /> : <ExportIcon />}
+          bordered
+          title={Locale.Export.Artifact.Title}
+          onClick={() => {
+            setLoading(true);
+            upload(getCode())
+              .then((res) => {
+                if (res?.id) {
+                  setShow(true);
+                  setName(res?.id);
+                }
+              })
+              .finally(() => setLoading(false));
+          }}
+        />
+      </div>
+      {show && (
+        <div className="modal-mask">
+          <Modal
+            title={Locale.Export.Artifact.Title}
+            onClose={() => setShow(false)}
+            actions={[
+              <IconButton
+                key="download"
+                icon={<DownloadIcon />}
+                bordered
+                text={Locale.Export.Download}
+                onClick={() => {
+                  downloadAs(getCode(), `${fileName || name}.html`).then(() =>
+                    setShow(false),
+                  );
+                }}
+              />,
+              <IconButton
+                key="copy"
+                icon={<CopyIcon />}
+                bordered
+                text={Locale.Chat.Actions.Copy}
+                onClick={() => {
+                  copyToClipboard(shareUrl).then(() => setShow(false));
+                }}
+              />,
+            ]}
+          >
+            <div>
+              <a target="_blank" href={shareUrl}>
+                {shareUrl}
+              </a>
+            </div>
+          </Modal>
+        </div>
+      )}
+    </>
+  );
+}
+
+export function Artifact() {
+  const { id } = useParams();
+  const [code, setCode] = useState("");
+  const [loading, setLoading] = useState(true);
+  const [fileName, setFileName] = useState("");
+
+  useEffect(() => {
+    if (id) {
+      fetch(`${ApiPath.Artifact}?id=${id}`)
+        .then((res) => {
+          if (res.status > 300) {
+            throw Error("can not get content");
+          }
+          return res;
+        })
+        .then((res) => res.text())
+        .then(setCode)
+        .catch((e) => {
+          showToast(Locale.Export.Artifact.Error);
+        });
+    }
+  }, [id]);
+
+  return (
+    <div className={styles["artifact"]}>
+      <div className={styles["artifact-header"]}>
+        <a href={REPO_URL} target="_blank" rel="noopener noreferrer">
+          <IconButton bordered icon={<GithubIcon />} shadow />
+        </a>
+        <div className={styles["artifact-title"]}>NextChat Artifact</div>
+        <ArtifactShareButton id={id} getCode={() => code} fileName={fileName} />
+      </div>
+      <div className={styles["artifact-content"]}>
+        {loading && <Loading />}
+        {code && (
+          <HTMLPreview
+            code={code}
+            autoHeight={false}
+            height={"100%"}
+            onLoad={(title) => {
+              setFileName(title as string);
+              setLoading(false);
+            }}
+          />
+        )}
+      </div>
+    </div>
+  );
+}