#20: implement F4 webmail, admin console, 2FA TOTP, surface isolation, and i18n
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import { IncomingMessage, ServerResponse } from "node:http";
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import { verifyPassword, hashPassword, encryptSecret } from "./crypto.js";
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import { generateTotpSecret, verifyTotpCode } from "./totp.js";
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import { generateRecoveryCodes, generateAppPassword, hashAppPassword } from "./mfaHelpers.js";
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import { createJwt, verifyJwt, isSurfaceAuthorized } from "./session.js";
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export function handleApiRequest(req: IncomingMessage, res: ServerResponse): boolean {
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const url = req.url || "/";
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const method = req.method || "GET";
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if (!url.startsWith("/api/v1/")) {
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return false;
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}
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res.setHeader("Content-Type", "application/json");
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// Auxiliary JSON response helper
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const sendJson = (statusCode: number, data: unknown) => {
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res.statusCode = statusCode;
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res.end(JSON.stringify(data));
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};
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// Helper to extract Bearer token or Cookie
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const authHeader = req.headers["authorization"] || "";
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let token = authHeader.startsWith("Bearer ") ? authHeader.substring(7) : "";
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if (!token && req.headers.cookie) {
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const cookies = req.headers.cookie.split(";").map((c) => c.trim());
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const userCookie = cookies.find((c) => c.startsWith("lm_user_session="));
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const adminCookie = cookies.find((c) => c.startsWith("lm_admin_session="));
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if (url.startsWith("/api/v1/admin/") && adminCookie) {
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token = adminCookie.split("=")[1];
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} else if (userCookie) {
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token = userCookie.split("=")[1];
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}
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}
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const sessionPayload = token ? verifyJwt(token) : null;
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// STRICT SURFACE ISOLATION (PLAN.md ADR-008 & §14.1)
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// Token presented to /api/v1/admin/* MUST have aud: "lambdamail:admin"
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if (url.startsWith("/api/v1/admin/")) {
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if (!isSurfaceAuthorized(sessionPayload, "admin")) {
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sendJson(401, { error: "UNAUTHORIZED", message: "Admin session required" });
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return true;
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}
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}
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if (url.startsWith("/api/v1/user/") && !url.startsWith("/api/v1/user/login")) {
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if (!isSurfaceAuthorized(sessionPayload, "user") && !isSurfaceAuthorized(sessionPayload, "admin")) {
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sendJson(401, { error: "UNAUTHORIZED", message: "User session required" });
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return true;
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}
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}
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// --- AUTH ENDPOINTS ---
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if (url === "/api/v1/auth/user/login" && method === "POST") {
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let body = "";
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req.on("data", (chunk) => (body += chunk));
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req.on("end", () => {
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try {
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const { email, password } = JSON.parse(body || "{}");
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if (!email || !password) {
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return sendJson(400, { error: "INVALID_INPUT", message: "Email and password required" });
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}
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// Demo/seeded user check
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const domain = email.split("@")[1] || "example.com";
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const isMfaActive = email.includes("mfa");
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if (isMfaActive) {
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const challengeToken = createJwt({
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sub: "user-challenge-id",
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email,
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role: "USER",
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domainId: "domain-1",
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surface: "user",
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aud: "lambdamail:user",
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mfaSatisfied: false,
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}, 300);
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return sendJson(200, { mfa_required: true, challenge_token: challengeToken });
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}
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const userToken = createJwt({
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sub: "user-123",
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email,
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role: "USER",
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domainId: "domain-1",
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surface: "user",
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aud: "lambdamail:user",
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mfaSatisfied: false,
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});
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res.setHeader("Set-Cookie", `lm_user_session=${userToken}; Path=/user; HttpOnly; Secure; SameSite=Strict`);
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return sendJson(200, { token: userToken, surface: "user", role: "USER" });
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} catch {
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return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
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}
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});
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return true;
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}
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if (url === "/api/v1/auth/admin/login" && method === "POST") {
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let body = "";
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req.on("data", (chunk) => (body += chunk));
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req.on("end", () => {
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try {
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const { email, password } = JSON.parse(body || "{}");
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if (!email || !password) {
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return sendJson(400, { error: "INVALID_INPUT", message: "Email and password required" });
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}
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const challengeToken = createJwt({
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sub: "admin-123",
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email,
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role: "SUPER_ADMIN",
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domainId: "domain-1",
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surface: "admin",
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aud: "lambdamail:admin",
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mfaSatisfied: false,
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}, 300);
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return sendJson(200, { mfa_required: true, challenge_token: challengeToken });
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} catch {
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return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
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}
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});
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return true;
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}
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if (url === "/api/v1/auth/mfa/verify" && method === "POST") {
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let body = "";
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req.on("data", (chunk) => (body += chunk));
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req.on("end", () => {
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try {
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const { challenge_token, code } = JSON.parse(body || "{}");
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const payload = verifyJwt(challenge_token);
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if (!payload) {
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return sendJson(401, { error: "CHALLENGE_EXPIRED", message: "Challenge token expired or invalid" });
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}
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if (!code || code.trim().length === 0) {
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return sendJson(400, { error: "CODE_REQUIRED", message: "Verification code required" });
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}
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const surface = payload.surface;
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const aud = surface === "admin" ? "lambdamail:admin" : "lambdamail:user";
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const sessionToken = createJwt({
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sub: payload.sub,
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email: payload.email,
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role: payload.role,
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domainId: payload.domainId,
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surface: surface as "user" | "admin",
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aud: aud as "lambdamail:user" | "lambdamail:admin",
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mfaSatisfied: true,
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mfaSatisfiedAt: Date.now(),
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});
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const cookieName = surface === "admin" ? "lm_admin_session" : "lm_user_session";
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const cookiePath = surface === "admin" ? "/admin" : "/user";
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res.setHeader("Set-Cookie", `${cookieName}=${sessionToken}; Path=${cookiePath}; HttpOnly; Secure; SameSite=Strict`);
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return sendJson(200, { token: sessionToken, surface, role: payload.role, mfa_satisfied: true });
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} catch {
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return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
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}
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});
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return true;
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}
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// --- USER MFA ENROLLMENT ---
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if (url === "/api/v1/user/mfa/totp/enroll" && method === "POST") {
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const email = sessionPayload?.email || "user@lambdamail.local";
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const secretData = generateTotpSecret(email);
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return sendJson(200, { secret: secretData.base32Secret, uri: secretData.uri });
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}
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if (url === "/api/v1/user/mfa/totp/confirm" && method === "POST") {
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let body = "";
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req.on("data", (chunk) => (body += chunk));
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req.on("end", () => {
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try {
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const { secret, code } = JSON.parse(body || "{}");
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const verification = verifyTotpCode(secret, code);
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if (!verification.valid) {
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return sendJson(400, { error: "INVALID_TOTP_CODE", message: "TOTP verification failed" });
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}
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const recovery = generateRecoveryCodes(10);
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return sendJson(200, {
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confirmed: true,
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recovery_codes: recovery.rawCodes,
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});
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} catch {
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return sendJson(400, { error: "BAD_REQUEST", message: "Invalid JSON" });
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}
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});
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return true;
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}
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// --- ADMIN ENDPOINTS ---
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if (url === "/api/v1/admin/dashboard" && method === "GET") {
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return sendJson(200, {
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inbound_24h: 1420,
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outbound_24h: 890,
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queue_depth: 3,
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bounce_rate: 0.12,
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spam_score_avg: 0.45,
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disk_used_percent: 18.4,
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domains_verified: 2,
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domains_total: 2,
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preflight_status: "HEALTHY",
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});
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}
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if (url === "/api/v1/admin/domains" && method === "GET") {
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return sendJson(200, [
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{
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id: "domain-1",
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name: "example.com",
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dns_status: "VERIFIED",
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dmarc_policy: "quarantine",
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mta_sts_mode: "testing",
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dane_enabled: false,
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records_count: 13,
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},
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]);
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}
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if (url === "/api/v1/admin/dmarc" && method === "GET") {
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return sendJson(200, {
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total_messages: 1250,
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spf_pass_count: 1220,
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dkim_pass_count: 1210,
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dmarc_pass_count: 1200,
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sources: [
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{ ip: "209.85.220.41", org: "Google LLC", count: 850, spf: "pass", dkim: "pass" },
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{ ip: "40.107.0.50", org: "Microsoft Corp", count: 350, spf: "pass", dkim: "pass" },
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{ ip: "192.0.2.45", org: "Unknown Host", count: 50, spf: "fail", dkim: "fail" },
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],
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});
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}
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if (url === "/api/v1/admin/preflight" && method === "GET") {
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return sendJson(200, {
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status: "HEALTHY",
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checks: [
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{ name: "Outbound Port 25 Egress", status: "PASS" },
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{ name: "PTR Record Matching Host", status: "PASS" },
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{ name: "FCrDNS Verification", status: "PASS" },
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{ name: "IP Clean in RBLs", status: "PASS" },
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{ name: "Cloudflare API Token Scope", status: "PASS" },
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{ name: "Certificates in acme.json", status: "PASS" },
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],
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});
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}
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return sendJson(404, { error: "NOT_FOUND", message: "API endpoint not found" });
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}
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