ut-code · nakaterm · Dec 26, 2025 · Dec 7, 2025 · Dec 19, 2025 · Dec 26, 2025
diff --git a/client/functions/[[path]].ts b/client/functions/[[path]].ts
@@ -17,7 +17,6 @@ interface ProjectData {
   }>;
 }
 
-// og:title を書き換える HTMLRewriter
 class OGTitleRewriter {
   private title: string;
 
@@ -32,7 +31,6 @@ class OGTitleRewriter {
   }
 }
 
-// og:description を書き換える HTMLRewriter
 class OGDescriptionRewriter {
   private description: string;
 
@@ -47,7 +45,20 @@ class OGDescriptionRewriter {
   }
 }
 
-// 日付を YYYY/MM/DD 形式にフォーマット（日本時間）
+class OGImageRewriter {
+  private imageUrl: string;
+
+  constructor(imageUrl: string) {
+    this.imageUrl = imageUrl;
+  }
+
+  element(element: Element) {
+    if (element.getAttribute("property") === "og:image") {
+      element.setAttribute("content", this.imageUrl);
+    }
+  }
+}
+
 function formatDate(dateString: string): string {
   const date = new Date(dateString);
   return new Intl.DateTimeFormat("ja-JP", {
@@ -74,14 +85,12 @@ async function fetchProjectData(eventId: string, apiEndpoint: string): Promise<P
   }
 }
 
-// eventId が有効かチェック（21文字のnanoid）
-function isValidEventId(path: string): boolean {
+function isValidEventPath(path: string): boolean {
   // 新パス /e/eventId または 旧パス /eventId の形式で、eventId が21文字の英数字・ハイフン・アンダースコア
   const match = path.match(/^\/(?:e\/)?([A-Za-z0-9_-]{21})$/);
   return !!match;
 }
 
-// パスから eventId を抽出
 function extractEventId(path: string): string | null {
   // 新パス /e/eventId または 旧パス /eventId から eventId を抽出
   const match = path.match(/^\/(?:e\/)?([A-Za-z0-9_-]{21})$/);
@@ -104,8 +113,7 @@ export async function onRequest(context: EventContext<Env, any, any>): Promise<R
     return await next();
   }
 
-  // eventId パターンをチェック
-  if (!isValidEventId(path)) {
+  if (!isValidEventPath(path)) {
     return await next();
   }
 
@@ -117,33 +125,36 @@ export async function onRequest(context: EventContext<Env, any, any>): Promise<R
   // 元のHTMLレスポンスを取得
   const response = await next();
 
-  // HTMLでない場合はそのまま返す
   const contentType = response.headers.get("content-type");
 
-  // 304 Not Modified の場合やHTMLでない場合はスキップ
+  // 304 Not Modified や HTML でない場合はスキップ
   if (response.status === 304 || (!contentType?.includes("text/html") && contentType !== null)) {
     return response;
   }
 
-  // プロジェクト情報を取得
   const projectData = await fetchProjectData(eventId, env.API_ENDPOINT);
 
+  const defaultOgImageUrl = `${url.origin}/og-image.jpg`;
+
   if (!projectData) {
-    return response;
+    // プロジェクトが見つからない場合はデフォルト画像を設定
+    return new HTMLRewriter()
+      .on('meta[property="og:image"]', new OGImageRewriter(defaultOgImageUrl))
+      .transform(response);
   }
 
-  // og:title を書き換え
   const ogTitle = `${projectData.name} - イツヒマ`;
 
-  // og:description を作成
   const startDate = formatDate(projectData.startDate);
   const endDate = formatDate(projectData.endDate);
-  const dateRange = startDate === endDate ? startDate : `${startDate} - ${endDate}`;
-
+  const dateRange = startDate === endDate ? startDate : `${startDate} 〜 ${endDate}`;
   const ogDescription = `日程範囲: ${dateRange}`;
 
+  const ogImageUrl = `${url.origin}/og/${eventId}`;
+
   return new HTMLRewriter()
     .on('meta[property="og:title"]', new OGTitleRewriter(ogTitle))
     .on('meta[property="og:description"]', new OGDescriptionRewriter(ogDescription))
+    .on('meta[property="og:image"]', new OGImageRewriter(ogImageUrl))
     .transform(response);
 }
diff --git a/client/functions/og/[eventId].tsx b/client/functions/og/[eventId].tsx
@@ -0,0 +1,189 @@
+/// <reference types="@cloudflare/workers-types" />
+import { ImageResponse } from "@cloudflare/pages-plugin-vercel-og/api";
+// biome-ignore lint/correctness/noUnusedImports: React is needed for JSX transform
+import React from "react";
+
+interface Env {
+  API_ENDPOINT: string;
+}
+
+interface ProjectData {
+  id: string;
+  name: string;
+  startDate: string;
+  endDate: string;
+}
+
+async function fetchProjectData(eventId: string, apiEndpoint: string): Promise<ProjectData | null> {
+  try {
+    const response = await fetch(`${apiEndpoint}/projects/${eventId}`);
+    if (!response.ok) {
+      return null;
+    }
+    return await response.json();
+  } catch (error) {
+    console.error("Failed to fetch project data:", error);
+    return null;
+  }
+}
+
+function formatDate(dateString: string): string {
+  const date = new Date(dateString);
+  return new Intl.DateTimeFormat("ja-JP", {
+    year: "numeric",
+    month: "2-digit",
+    day: "2-digit",
+    timeZone: "Asia/Tokyo",
+  })
+    .format(date)
+    .replace(/-/g, "/");
+}
+
+function truncateByWidth(text: string, maxWidth = 60): string {
+  let width = 0;
+  let result = "";
+
+  for (const char of text) {
+    // ASCII なら 1、それ以外は 2
+    const charWidth = char.charCodeAt(0) < 128 ? 1 : 2;
+
+    if (width + charWidth > maxWidth) {
+      break;
+    }
+
+    width += charWidth;
+    result += char;
+  }
+
+  if (result.length < text.length) {
+    result += "…";
+  }
+
+  return result;
+}
+
+export const onRequestGet: PagesFunction<Env, "eventId"> = async (context) => {
+  const { env, params } = context;
+  const eventId = params.eventId;
+
+  if (typeof eventId !== "string") {
+    console.error("eventId is not a string");
+    return new Response("Invalid event ID", { status: 400 });
+  }
+
+  if (!eventId || !/^[A-Za-z0-9_-]{21}$/.test(eventId)) {
+    return new Response("Invalid event ID", { status: 400 });
+  }
+
+  const projectData = await fetchProjectData(eventId, env.API_ENDPOINT);
+
+  if (!projectData) {
+    // プロジェクトがない場合はデフォルト画像にリダイレクト
+    const url = new URL(context.request.url);
+    return Response.redirect(`${url.origin}/og-image.jpg`, 302);
+  }
+
+  const fontData = await fetch(
+    "https://unpkg.com/@fontsource/[email protected]/files/m-plus-1p-japanese-700-normal.woff",
+  ).then((res) => res.arrayBuffer());
+
+  const projectName = truncateByWidth(projectData.name, 72);
+
+  const startDate = formatDate(projectData.startDate);
+  const endDate = formatDate(projectData.endDate);
+  const dateRange = startDate === endDate ? startDate : `${startDate} 〜 ${endDate}`;
+
+  const response = new ImageResponse(
+    <div
+      style={{
+        display: "flex",
+        backgroundColor: "#0f82b1",
+        padding: "48px 56px",
+        width: "100%",
+        height: "100%",
+        fontFamily: "M PLUS 1p",
+        fontWeight: 700,
+      }}
+    >
+      <div
+        style={{
+          display: "flex",
+          backgroundColor: "#fff",
+          color: "#555",
+          flexDirection: "column",
+          borderRadius: "32px",
+          flex: 1,
+          alignItems: "center",
+          padding: "40px",
+          justifyContent: "space-between",
+        }}
+      >
+        <div
+          style={{
+            display: "flex",
+            flexDirection: "column",
+            gap: "24px",
+            justifyContent: "center",
+            alignItems: "center",
+          }}
+        >
+          <span
+            style={{
+              fontSize: "64px",
+              textAlign: "center",
+              wordBreak: "break-word",
+            }}
+          >
+            {projectName}
+          </span>
+          <span
+            style={{
+              fontSize: "40px",
+              textAlign: "center",
+            }}
+          >
+            {dateRange}
+          </span>
+        </div>
+        <div
+          style={{
+            color: "#0f82b1",
+            display: "flex",
+            alignItems: "center",
+            gap: "8px",
+            fontSize: "40px",
+          }}
+        >
+          <svg
+            width="48"
+            height="48"
+            viewBox="0 0 50 50"
+            fill="none"
+            xmlns="http://www.w3.org/2000/svg"
+            role="img"
+            aria-hidden="true"
+          >
+            <rect x="34" width="16" height="33" rx="2" fill="#0F82B1" />
+            <rect y="17" width="33" height="16" rx="2" fill="#0F82B1" />
+            <rect x="17" y="34" width="16" height="16" rx="2" fill="#0F82B1" />
+          </svg>
+          <div>イツヒマ</div>
+        </div>
+      </div>
+    </div>,
+    {
+      width: 1200,
+      height: 630,
+      fonts: [
+        {
+          name: "M PLUS 1p",
+          data: fontData,
+          weight: 700,
+          style: "normal",
+        },
+      ],
+    },
+  );
+
+  return response;
+};
diff --git a/client/package.json b/client/package.json
@@ -12,14 +12,12 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "@emotion/react": "^11.14.0",
-    "@emotion/styled": "^11.14.0",
+    "@cloudflare/pages-plugin-vercel-og": "^0.1.2",
     "@fullcalendar/core": "^6.1.15",
     "@fullcalendar/interaction": "^6.1.15",
     "@fullcalendar/react": "^6.1.15",
     "@fullcalendar/timegrid": "^6.1.15",
     "@hookform/resolvers": "^4.1.3",
-    "@mui/material": "^6.4.7",
     "@tailwindcss/vite": "^4.0.13",
     "dayjs": "^1.11.13",
     "react": "^19.0.0",
@@ -37,7 +35,6 @@
     "@types/react-dom": "^19.0.4",
     "@vitejs/plugin-react": "^4.3.4",
     "daisyui": "^5.0.3",
-    "globals": "^15.15.0",
     "hono": "^4.9.6",
     "typescript": "~5.7.2",
     "vite": "^6.3.5"

diff --git a/client/src/pages/Home.tsx b/client/src/pages/Home.tsx
@@ -31,8 +31,9 @@ export default function HomePage() {
           let errorMessage = "イベントの取得に失敗しました。";
           try {
             const data = await res.json();
-            if (data && typeof data.message === "string" && data.message.trim()) {
-              errorMessage = data.message.trim();
+            const err = data as unknown as { message: string }; // Middleware のレスポンスは Hono RPC の型に乗らない
+            if (typeof err.message === "string" && err.message.trim()) {
+              errorMessage = err.message.trim();
             }
           } catch (_) {
             // レスポンスがJSONでない場合は無視

diff --git a/client/src/pages/Project.tsx b/client/src/pages/Project.tsx
@@ -93,6 +93,7 @@ export default function ProjectPage() {
     projectName: string;
   } | null>(null);
 
+  // TODO: グローバルにしないと、delete の際は遷移を伴うので表示されない
   const [toast, setToast] = useState<{
     message: string;
     variant: "success" | "error";
@@ -215,9 +216,8 @@ export default function ProjectPage() {
           projectName: name,
         });
       } else {
-        const { message } = await res.json();
         setToast({
-          message,
+          message: "イベントの作成に失敗しました。",
           variant: "error",
         });
         setTimeout(() => setToast(null), 3000);
@@ -604,6 +604,7 @@ export default function ProjectPage() {
                             if (!res.ok) {
                               throw new Error("削除に失敗しました。");
                             }
+                            // TODO: トーストをグローバルにする
                             navigate("/home");
                             setToast({
                               message: "イベントを削除しました。",