feat: add contact form API with Discord webhook, rate limiting, and anti-bot checks

2026-04-28 02:04:25 +08:00
parent a36c5c2510
commit b1cdfae6b7
4 changed files with 200 additions and 1 deletions
@@ -0,0 +1,189 @@
+import { Elysia, t } from "elysia"
+
+// ── In-memory rate limiter for contact form ──────────────────────
+const contactLimiter = new Map<string, { count: number; resetAt: number }>()
+const RATE_LIMIT_MAX = 3
+const RATE_LIMIT_WINDOW = 60 * 60 * 1000 // 1 hour in ms
+
+// Clean up expired entries every 5 minutes
+setInterval(() => {
+  const now = Date.now()
+  for (const [key, entry] of contactLimiter) {
+    if (now > entry.resetAt) contactLimiter.delete(key)
+  }
+}, 5 * 60 * 1000)
+
+function getClientIP(request: Request): string {
+  const forwarded = request.headers.get("x-forwarded-for")
+  if (forwarded) return forwarded.split(",")[0].trim()
+  return "unknown"
+}
+
+function checkContactRateLimit(ip: string): { allowed: boolean; retryAfter: number } {
+  const now = Date.now()
+  const entry = contactLimiter.get(ip)
+
+  if (!entry || now > entry.resetAt) {
+    contactLimiter.set(ip, { count: 1, resetAt: now + RATE_LIMIT_WINDOW })
+    return { allowed: true, retryAfter: 0 }
+  }
+
+  if (entry.count >= RATE_LIMIT_MAX) {
+    const retryAfter = Math.ceil((entry.resetAt - now) / 1000)
+    return { allowed: false, retryAfter }
+  }
+
+  entry.count++
+  return { allowed: true, retryAfter: 0 }
+}
+
+// ── Discord embed colors by category ─────────────────────────────
+const CATEGORY_COLORS: Record<string, number> = {
+  bug: 0xe74c3c,           // red
+  game_data: 0xf1c40f,     // yellow
+  user_report: 0x3498db,   // blue
+  feature: 0x2ecc71,       // green
+  feedback: 0x95a5a6,      // grey
+  database: 0xe74c3c,      // red
+}
+
+const CATEGORY_LABELS: Record<string, string> = {
+  bug: "Bug Report",
+  game_data: "Game Data Issue",
+  user_report: "User Report",
+  feature: "Feature Request",
+  feedback: "General Feedback",
+  database: "Database Error",
+}
+
+const VALID_CATEGORIES = ["bug", "game_data", "user_report", "feature", "feedback", "database"]
+
+export const contactRoutes = new Elysia({ prefix: "/contact" }).post(
+  "/",
+  async ({ body, request, set }) => {
+    const payload = body as {
+      category: string
+      name?: string
+      email?: string
+      subject: string
+      message: string
+      gameUrl?: string
+      honeypot?: string
+      _timestamp?: string
+    }
+
+    // ── Honeypot check ──────────────────────────────────────────
+    if (payload.honeypot) {
+      set.status = 200
+      return { success: true }
+    }
+
+    // ── Timing check (must take > 3 seconds) ─────────────────────
+    if (payload._timestamp) {
+      const start = Number(payload._timestamp)
+      if (!isNaN(start) && Date.now() - start < 3000) {
+        set.status = 200
+        return { success: true }
+      }
+    }
+
+    // ── Rate limit ──────────────────────────────────────────────
+    const ip = getClientIP(request)
+    const rateCheck = checkContactRateLimit(ip)
+    if (!rateCheck.allowed) {
+      set.status = 429
+      return { error: "Too many submissions. Please try again later.", retryAfter: rateCheck.retryAfter }
+    }
+
+    // ── Validate category ──────────────────────────────────────
+    if (!VALID_CATEGORIES.includes(payload.category)) {
+      set.status = 400
+      return { error: "Invalid category" }
+    }
+
+    // ── Validate required fields ────────────────────────────────
+    if (!payload.subject || payload.subject.trim().length === 0) {
+      set.status = 400
+      return { error: "Subject is required" }
+    }
+    if (payload.subject.length > 200) {
+      set.status = 400
+      return { error: "Subject must be 200 characters or less" }
+    }
+    if (!payload.message || payload.message.trim().length === 0) {
+      set.status = 400
+      return { error: "Message is required" }
+    }
+    if (payload.message.length > 2000) {
+      set.status = 400
+      return { error: "Message must be 2000 characters or less" }
+    }
+
+    // ── Validate game URL for game_data category ────────────────
+    if (payload.category === "game_data" && payload.gameUrl) {
+      if (!payload.gameUrl.includes("/game/")) {
+        set.status = 400
+        return { error: "Game URL must be a valid DeckyVault game link" }
+      }
+    }
+
+    // ── Validate email format if provided ───────────────────────
+    if (payload.email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(payload.email)) {
+      set.status = 400
+      return { error: "Invalid email format" }
+    }
+
+    // ── Send to Discord webhook ─────────────────────────────────
+    const webhookUrl = process.env.DISCORD_WEBHOOK_URL
+    if (!webhookUrl) {
+      console.error("[Contact] DISCORD_WEBHOOK_URL not configured")
+      set.status = 500
+      return { error: "Service not configured. Please try again later." }
+    }
+
+    const embed = {
+      title: `[${CATEGORY_LABELS[payload.category]}] ${payload.subject}`,
+      description: payload.message.slice(0, 4096),
+      color: CATEGORY_COLORS[payload.category] ?? 0x95a5a6,
+      fields: [
+        ...(payload.name ? [{ name: "Name", value: payload.name, inline: true }] : []),
+        ...(payload.email ? [{ name: "Email", value: payload.email, inline: true }] : []),
+        ...(payload.gameUrl ? [{ name: "Game URL", value: payload.gameUrl, inline: false }] : []),
+        { name: "IP Hash", value: `\`${ip.slice(0, 8)}...\``, inline: true },
+      ],
+      timestamp: new Date().toISOString(),
+    }
+
+    try {
+      const res = await fetch(webhookUrl, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({ embeds: [embed] }),
+      })
+
+      if (!res.ok) {
+        console.error("[Contact] Discord webhook failed:", res.status, await res.text())
+        set.status = 500
+        return { error: "Failed to submit. Please try again later." }
+      }
+    } catch (err) {
+      console.error("[Contact] Discord webhook error:", err)
+      set.status = 500
+      return { error: "Failed to submit. Please try again later." }
+    }
+
+    return { success: true }
+  },
+  {
+    body: t.Object({
+      category: t.String(),
+      name: t.Optional(t.String()),
+      email: t.Optional(t.String()),
+      subject: t.String(),
+      message: t.String(),
+      gameUrl: t.Optional(t.String()),
+      honeypot: t.Optional(t.String()),
+      _timestamp: t.Optional(t.String()),
+    }),
+  },
+)
@@ -10,3 +10,4 @@ export { gameStatsRoutes } from "./game-stats"
 export { hardwareStatsRoutes } from "./hardware-stats"
 export { savedGamesRoutes } from "./saved-games"
 export { reportRoutes } from "./reports"
+export { contactRoutes } from "./contact"