Checkpoint: Initial stable CheckFlow base before i18n and demo mode

src/app/api/dav/[...path]/route.ts

@@ -0,0 +1,77 @@
+import { NextRequest, NextResponse } from "next/server";
+import { prisma } from "@/lib/prisma";
+import bcrypt from "bcryptjs";
+
+async function authenticate(req: NextRequest) {
+  const authHeader = req.headers.get("authorization");
+  if (!authHeader?.startsWith("Basic ")) return null;
+  const decoded = Buffer.from(authHeader.slice(6), "base64").toString();
+  const [email, password] = decoded.split(":");
+  const user = await prisma.user.findUnique({ where: { email } });
+  if (!user) return null;
+  const valid = await bcrypt.compare(password, user.passwordHash);
+  return valid ? user : null;
+}
+
+function taskToVTodo(task: { id: string; title: string; note: string | null; completed: boolean; completedAt: Date | null; dueDate: Date | null; priority: number; createdAt: Date; updatedAt: Date }) {
+  const now = new Date().toISOString().replace(/[-:]/g, "").split(".")[0] + "Z";
+  const priorityMap: Record<number, number> = { 0: 0, 1: 9, 2: 5, 3: 1 };
+  let vtodo = [
+    "BEGIN:VTODO",
+    `UID:${task.id}@checkflow`,
+    `DTSTAMP:${now}`,
+    `CREATED:${task.createdAt.toISOString().replace(/[-:]/g, "").split(".")[0] + "Z"}`,
+    `LAST-MODIFIED:${task.updatedAt.toISOString().replace(/[-:]/g, "").split(".")[0] + "Z"}`,
+    `SUMMARY:${task.title.replace(/\n/g, "\\n")}`,
+    `STATUS:${task.completed ? "COMPLETED" : "NEEDS-ACTION"}`,
+    `PRIORITY:${priorityMap[task.priority] ?? 0}`,
+  ];
+  if (task.note) vtodo.push(`DESCRIPTION:${task.note.replace(/\n/g, "\\n")}`);
+  if (task.dueDate) vtodo.push(`DUE:${task.dueDate.toISOString().replace(/[-:]/g, "").split(".")[0] + "Z"}`);
+  if (task.completedAt) vtodo.push(`COMPLETED:${task.completedAt.toISOString().replace(/[-:]/g, "").split(".")[0] + "Z"}`);
+  vtodo.push("END:VTODO");
+  return vtodo.join("\r\n");
+}
+
+// Handle all CalDAV/CardDAV requests
+export async function GET(req: NextRequest) {
+  const user = await authenticate(req);
+  if (!user) {
+    return new NextResponse("Unauthorized", {
+      status: 401,
+      headers: { "WWW-Authenticate": 'Basic realm="CheckFlow"' },
+    });
+  }
+
+  const tasks = await prisma.task.findMany({
+    where: { userId: user.id, parentId: null },
+    orderBy: { sortOrder: "asc" },
+  });
+
+  const icsContent = [
+    "BEGIN:VCALENDAR",
+    "VERSION:2.0",
+    "PRODID:-//CheckFlow//CheckFlow//EN",
+    "CALSCALE:GREGORIAN",
+    "METHOD:PUBLISH",
+    ...tasks.map(taskToVTodo),
+    "END:VCALENDAR",
+  ].join("\r\n");
+
+  return new NextResponse(icsContent, {
+    headers: {
+      "Content-Type": "text/calendar; charset=utf-8",
+      "Content-Disposition": "attachment; filename=checkflow.ics",
+    },
+  });
+}
+
+// OPTIONS for CORS
+export async function OPTIONS() {
+  return new NextResponse(null, {
+    headers: {
+      Allow: "GET, OPTIONS",
+      "DAV": "1, 2, calendar-access",
+    },
+  });
+}