Merge pull request #3 from mskatoni/ni-mail-R2-beta

Add files via upload

.dev.vars.example

@@ -0,0 +1,3 @@
+AUTH_KEY=replace-with-a-long-random-string
+DOMAINS=example.com,example.net
+DEFAULT_MAILBOX=

.gitignore

@@ -1,3 +1,8 @@
-node_modules/
-.wrangler/
-dist/
+node_modules
+.wrangler
+.dev.vars
+.env
+.env.*
+dist
+coverage
+.DS_Store

.npmrc

@@ -0,0 +1,7 @@
+registry=https://registry.npmjs.org/
+audit=false
+fund=false
+progress=false
+fetch-retries=5
+fetch-retry-mintimeout=20000
+fetch-retry-maxtimeout=120000

CLOUDFLARE_BUILDS.md

@@ -0,0 +1,70 @@
+# Cloudflare Builds Checklist
+
+This project deploys in source-first mode.
+
+- Worker name: `ni-mail`
+- Wrangler entrypoint: `src/index.ts`
+- Compatibility passthrough: `worker.js`
+- Deploy command: `npm run deploy`
+- Build command: leave empty
+- Root directory: repository root (`/` or blank)
+
+If you upload files manually to GitHub, include the entire `src/` folder. The deployment will fail if `wrangler.jsonc` is present but `src/index.ts` is missing from the repository snapshot.
+
+## Required dashboard settings
+
+In Cloudflare Dashboard for Worker `ni-mail`:
+
+1. Open `Settings -> Builds`.
+2. Confirm the connected GitHub repository is this project.
+3. Confirm the production branch is the branch that already contains `src/index.ts` and the current `wrangler.jsonc`.
+4. Set `Root directory` to `/` or leave it blank.
+5. Leave `Build command` empty.
+6. Set `Deploy command` to `npm run deploy`.
+7. Save the settings.
+8. Retry the failed build.
+
+## Local verification
+
+Run these commands from the repository root:
+
+```bash
+npm clean-install --progress=false
+npm run check:deploy
+```
+
+Expected result:
+
+- Wrangler resolves `src/index.ts`
+- Wrangler detects the `MAILBOX` Durable Object binding
+- Wrangler detects the `BUCKET` R2 binding
+
+After a local `npm run dev` or a production deploy, run:
+
+```bash
+BASE_URL=https://<your-worker-or-domain> AUTH_KEY=<your-key> MAILBOX=hello@example.com npm run smoke
+```
+
+Mailbox reads may return `404` until mail arrives.
+
+## If Git Builds still says `src/index.ts` is missing
+
+Treat that as a stale or misbound Cloudflare Builds source configuration.
+
+1. Disconnect the GitHub repository from Worker `ni-mail`.
+2. Reconnect the same repository.
+3. Re-select the correct production branch.
+4. Re-apply the settings above.
+5. Trigger a fresh build with a new commit or a manual retry.
+
+## Smoke test after deploy
+
+```bash
+curl https://<your-worker>/health
+```
+
+Expected response:
+
+```json
+{ "ok": true, "service": "ni-mail" }
+```

THIRD_PARTY_NOTICES.md

@@ -0,0 +1,13 @@
+# Third-party notices
+
+This repository is an original rewrite prepared for integrating ideas from lightweight mail-reader Workers and Cloudflare inbox examples.
+
+The implementation in this package was written as a clean-room backend-oriented adaptation focused on:
+
+- mailbox isolation
+- threaded inbox storage
+- Cloudflare Durable Objects + SQLite
+- R2 attachment storage
+- Cloudflare `send_email` integration
+
+Please review the upstream repositories for their original licenses and notices before mixing code verbatim from them into another distribution.

package.json

@@ -1,16 +1,31 @@
 {
-  "name": "mail-worker",
-  "version": "1.0.0",
-  "description": "Minimal Cloudflare Worker for receiving and reading emails via API",
-  "main": "src/worker.js",
+  "name": "ni-mail",
+  "version": "2.0.1",
+  "private": false,
+  "description": "Minimal Cloudflare Worker for receiving private-domain email over HTTP API; upgraded to Durable Objects + SQLite + R2 with optional send/reply/forward support.",
+  "type": "module",
   "scripts": {
+    "dev": "wrangler dev",
     "deploy": "wrangler deploy",
-    "dev": "wrangler dev"
+    "check:deploy": "wrangler deploy --dry-run",
+    "smoke": "node scripts/examples.mjs"
   },
   "dependencies": {
-    "postal-mime": "^2.2.9"
+    "postal-mime": "^2.6.1"
   },
   "devDependencies": {
-    "wrangler": "^3.0.0"
-  }
+    "wrangler": "4.83.0"
+  },
+  "engines": {
+    "node": ">=20"
+  },
+  "keywords": [
+    "cloudflare",
+    "workers",
+    "email",
+    "durable-objects",
+    "sqlite",
+    "r2"
+  ],
+  "license": "Apache-2.0"
 }

scripts/examples.mjs

@@ -0,0 +1,58 @@
+const baseUrl = process.env.BASE_URL || "http://localhost:8787";
+const authKey = process.env.AUTH_KEY || "replace-me";
+const mailbox = process.env.MAILBOX || "hello@example.com";
+const runSend = process.env.RUN_SEND === "1";
+const encodedMailbox = encodeURIComponent(mailbox);
+
+async function printResponse(title, response) {
+  const body = await response.text();
+  console.log(`== ${title} ==`);
+  console.log(body);
+  console.log();
+}
+
+async function request(path, init = {}) {
+  try {
+    return await fetch(`${baseUrl}${path}`, {
+      ...init,
+      headers: {
+        "X-Auth-Key": authKey,
+        ...(init.headers || {}),
+      },
+    });
+  } catch (error) {
+    throw new Error(`Could not connect to ${baseUrl}. Start Wrangler dev or set BASE_URL to a deployed Worker.`, {
+      cause: error,
+    });
+  }
+}
+
+try {
+  await printResponse("health", await request("/health", { headers: {} }));
+  await printResponse("list latest", await request(`/latest?mailbox=${encodeURIComponent(mailbox)}`));
+  await printResponse(
+    "threaded inbox",
+    await request(`/api/mailboxes/${encodedMailbox}/emails?folder=inbox&threaded=true&limit=10`),
+  );
+
+  if (runSend) {
+    await printResponse(
+      "send",
+      await request(`/api/mailboxes/${encodedMailbox}/send`, {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          to: ["user@example.net"],
+          subject: "hello from ni-mail",
+          text: "test body",
+        }),
+      }),
+    );
+  } else {
+    console.log("== send ==");
+    console.log("skipped; set RUN_SEND=1 to exercise the optional EMAIL binding");
+  }
+} catch (error) {
+  console.error(error instanceof Error ? error.message : error);
+  process.exitCode = 1;
+}

scripts/examples.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+BASE_URL="${BASE_URL:-http://localhost:8787}"
+AUTH_KEY="${AUTH_KEY:-replace-me}"
+MAILBOX="${MAILBOX:-hello@example.com}"
+RUN_SEND="${RUN_SEND:-0}"
+ENCODED_MAILBOX="$(node -e "console.log(encodeURIComponent(process.env.MAILBOX || 'hello@example.com'))")"
+
+curl_json() {
+  curl -sS \
+    -H "X-Auth-Key: ${AUTH_KEY}" \
+    -H "Content-Type: application/json" \
+    "$@"
+}
+
+echo "== health =="
+curl -sS "${BASE_URL}/health"
+echo
+
+echo "== list latest =="
+curl -sS -H "X-Auth-Key: ${AUTH_KEY}" "${BASE_URL}/latest?mailbox=${MAILBOX}"
+echo
+
+echo "== threaded inbox =="
+curl -sS -H "X-Auth-Key: ${AUTH_KEY}" "${BASE_URL}/api/mailboxes/${ENCODED_MAILBOX}/emails?folder=inbox&threaded=true&limit=10"
+echo
+
+echo "== send =="
+if [ "${RUN_SEND}" = "1" ]; then
+  curl_json -X POST "${BASE_URL}/api/mailboxes/${ENCODED_MAILBOX}/send" \
+    --data '{
+      "to": ["user@example.net"],
+      "subject": "hello from ni-mail",
+      "text": "test body"
+    }'
+  echo
+else
+  echo "skipped; set RUN_SEND=1 to exercise the optional EMAIL binding"
+fi

src/global.d.ts

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+declare module "postal-mime" {
+  export interface PostalMimeAttachment {
+    filename?: string;
+    mimeType?: string;
+    content?: ArrayBuffer | Uint8Array | string | null;
+    contentId?: string | null;
+    disposition?: string | null;
+  }
+
+  export interface PostalMimeResult {
+    subject?: string | null;
+    text?: string | null;
+    html?: string | null;
+    attachments?: PostalMimeAttachment[] | null;
+  }
+
+  export default class PostalMime {
+    constructor(options?: Record<string, unknown>);
+    parse(input: ArrayBuffer | Uint8Array | string): Promise<PostalMimeResult>;
+  }
+}
+
+declare module "cloudflare:workers" {
+  export class DurableObject {
+    constructor(state: any, env: any);
+  }
+}

src/index.ts

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+import PostalMime from "postal-mime";
+import type { Env, IncomingEmailPayload, StoredAttachmentInput } from "./types";
+import { MailboxDO } from "./mailbox-do";
+import {
+  assertAuthorized,
+  badRequest,
+  buildSnippet,
+  isAllowedMailbox,
+  json,
+  mailboxStub,
+  normalizeEmail,
+  normalizeMessageId,
+  notFound,
+  parseJson,
+  resolveMailbox,
+  serverError,
+  toBase64,
+  unauthorized,
+} from "./utils";
+
+export { MailboxDO };
+
+export default {
+  async fetch(request: Request, env: Env): Promise<Response> {
+    const url = new URL(request.url);
+
+    if (url.pathname === "/health") {
+      return json({ ok: true, service: "ni-mail" });
+    }
+
+    if (!assertAuthorized(request, env)) {
+      return unauthorized();
+    }
+
+    try {
+      if (request.method === "GET" && url.pathname === "/latest") {
+        const mailbox = resolveMailbox(request, env);
+        if (!mailbox) return badRequest("mailbox is required");
+        return proxyToMailbox(env, mailbox, `/internal/emails/latest?folder=inbox`);
+      }
+
+      if (request.method === "GET" && url.pathname === "/mails") {
+        const mailbox = resolveMailbox(request, env);
+        if (!mailbox) return badRequest("mailbox is required");
+        const search = new URLSearchParams(url.search);
+        if (!search.has("folder")) search.set("folder", "inbox");
+        return proxyToMailbox(env, mailbox, `/internal/emails?${search.toString()}`);
+      }
+
+      const legacyMailMatch = url.pathname.match(/^\/mail\/([^/]+)$/);
+      if (request.method === "GET" && legacyMailMatch) {
+        const mailbox = resolveMailbox(request, env);
+        if (!mailbox) return badRequest("mailbox is required");
+        return proxyToMailbox(env, mailbox, `/internal/emails/${encodeURIComponent(decodeURIComponent(legacyMailMatch[1]!))}`);
+      }
+
+      if (request.method === "DELETE" && url.pathname === "/mails") {
+        const mailbox = resolveMailbox(request, env);
+        if (!mailbox) return badRequest("mailbox is required");
+        const folder = url.searchParams.get("folder") ?? "inbox";
+        return proxyToMailbox(env, mailbox, `/internal/inbox?folder=${encodeURIComponent(folder)}`, { method: "DELETE" });
+      }
+
+      const mailboxBase = url.pathname.match(/^\/api\/mailboxes\/([^/]+)(\/.*)?$/);
+      if (mailboxBase) {
+        const mailboxId = normalizeEmail(decodeURIComponent(mailboxBase[1]!));
+        if (!isAllowedMailbox(mailboxId, env)) {
+          return badRequest(`mailbox domain is not allowed: ${mailboxId}`);
+        }
+
+        const subPath = mailboxBase[2] ?? "";
+
+        if (request.method === "GET" && subPath === "/latest") {
+          const folder = url.searchParams.get("folder") ?? "inbox";
+          return proxyToMailbox(env, mailboxId, `/internal/emails/latest?folder=${encodeURIComponent(folder)}`);
+        }
+
+        if (request.method === "GET" && subPath === "/emails") {
+          const search = new URLSearchParams(url.search);
+          if (!search.has("folder")) search.set("folder", "inbox");
+          return proxyToMailbox(env, mailboxId, `/internal/emails?${search.toString()}`);
+        }
+
+        const emailMatch = subPath.match(/^\/emails\/([^/]+)$/);
+        if (request.method === "GET" && emailMatch) {
+          return proxyToMailbox(env, mailboxId, `/internal/emails/${encodeURIComponent(decodeURIComponent(emailMatch[1]!))}`);
+        }
+
+        const readMatch = subPath.match(/^\/emails\/([^/]+)\/read$/);
+        if (request.method === "POST" && readMatch) {
+          return proxyToMailbox(env, mailboxId, `/internal/emails/${encodeURIComponent(decodeURIComponent(readMatch[1]!))}/read`, { method: "POST" });
+        }
+
+        const threadMatch = subPath.match(/^\/threads\/([^/]+)$/);
+        if (request.method === "GET" && threadMatch) {
+          return proxyToMailbox(env, mailboxId, `/internal/threads/${encodeURIComponent(decodeURIComponent(threadMatch[1]!))}`);
+        }
+
+        if (request.method === "POST" && subPath === "/send") {
+          const body = await parseJson<Record<string, unknown>>(request);
+          return proxyToMailbox(env, mailboxId, `/internal/send`, {
+            method: "POST",
+            headers: { "content-type": "application/json" },
+            body: JSON.stringify({ ...body, mailboxId }),
+          });
+        }
+
+        if (request.method === "POST" && subPath === "/reply") {
+          const body = await parseJson<Record<string, unknown>>(request);
+          return proxyToMailbox(env, mailboxId, `/internal/reply`, {
+            method: "POST",
+            headers: { "content-type": "application/json" },
+            body: JSON.stringify({ ...body, mailboxId }),
+          });
+        }
+
+        if (request.method === "POST" && subPath === "/forward") {
+          const body = await parseJson<Record<string, unknown>>(request);
+          return proxyToMailbox(env, mailboxId, `/internal/forward`, {
+            method: "POST",
+            headers: { "content-type": "application/json" },
+            body: JSON.stringify({ ...body, mailboxId }),
+          });
+        }
+
+        if (request.method === "DELETE" && subPath === "/emails") {
+          const folder = url.searchParams.get("folder") ?? "inbox";
+          return proxyToMailbox(env, mailboxId, `/internal/inbox?folder=${encodeURIComponent(folder)}`, { method: "DELETE" });
+        }
+      }
+
+      const attachmentMatch = url.pathname.match(/^\/api\/attachments\/([^/]+)$/);
+      if (request.method === "GET" && attachmentMatch) {
+        const mailbox = resolveMailbox(request, env);
+        if (!mailbox) return badRequest("mailbox is required");
+        return proxyToMailbox(env, mailbox, `/internal/attachments/${encodeURIComponent(decodeURIComponent(attachmentMatch[1]!))}`);
+      }
+
+      return notFound("unknown route");
+    } catch (error) {
+      return serverError("request failed", serializeError(error));
+    }
+  },
+
+  async email(message: ForwardableEmailMessageLike, env: Env): Promise<void> {
+    const mailbox = normalizeEmail(message.to);
+    if (!isAllowedMailbox(mailbox, env)) {
+      message.setReject(`mailbox domain not allowed: ${mailbox}`);
+      return;
+    }
+
+    try {
+      const parser = new PostalMime();
+      const raw = await new Response(message.raw).arrayBuffer();
+      const parsed = await parser.parse(raw);
+      const headers = Object.fromEntries(Array.from(message.headers.entries()).map(([key, value]) => [key.toLowerCase(), value]));
+      const subject = parsed.subject ?? "(no subject)";
+      const bodyText = parsed.text ?? "";
+      const bodyHtml = parsed.html ?? "";
+      const attachments: StoredAttachmentInput[] = (parsed.attachments ?? []).map((attachment) => ({
+        filename: attachment.filename ?? "attachment.bin",
+        type: attachment.mimeType ?? "application/octet-stream",
+        disposition: attachment.disposition === "inline" ? "inline" : "attachment",
+        contentId: attachment.contentId ?? undefined,
+        contentBase64: toBase64(attachment.content ?? new Uint8Array()),
+      }));
+
+      const payload: IncomingEmailPayload = {
+        id: crypto.randomUUID(),
+        folderId: "inbox",
+        from: normalizeEmail(message.from),
+        to: mailbox,
+        cc: headers["cc"] ?? null,
+        bcc: headers["bcc"] ?? null,
+        subject,
+        bodyText,
+        bodyHtml,
+        snippet: buildSnippet(bodyText, bodyHtml),
+        date: headers["date"] ? new Date(headers["date"]).toISOString() : new Date().toISOString(),
+        messageId: normalizeMessageId(headers["message-id"] ?? `${crypto.randomUUID()}@${mailbox.split("@")[1] ?? "localhost"}`),
+        inReplyTo: normalizeMessageId(headers["in-reply-to"] ?? ""),
+        references: headers["references"] ?? null,
+        rawHeaders: headers,
+        attachments,
+      };
+
+      const response = await proxyToMailbox(env, mailbox, `/internal/incoming`, {
+        method: "POST",
+        headers: { "content-type": "application/json" },
+        body: JSON.stringify(payload),
+      });
+      if (!response.ok) {
+        const textBody = await response.text();
+        throw new Error(`mailbox storage failed: ${textBody}`);
+      }
+    } catch (error) {
+      message.setReject(`worker failed to process email: ${stringifyError(error)}`);
+    }
+  },
+};
+
+type ForwardableEmailMessageLike = {
+  from: string;
+  to: string;
+  headers: Headers;
+  raw: ReadableStream<Uint8Array>;
+  setReject(reason: string): void;
+};
+
+async function proxyToMailbox(env: Env, mailboxId: string, path: string, init?: RequestInit): Promise<Response> {
+  const stub = mailboxStub(env, mailboxId);
+  const request = new Request(`https://mailbox.internal${path}`, init);
+  return await stub.fetch(request);
+}
+
+function serializeError(error: unknown): Record<string, unknown> {
+  if (error instanceof Error) {
+    return {
+      name: error.name,
+      message: error.message,
+      stack: error.stack,
+    };
+  }
+  return { message: String(error) };
+}
+
+function stringifyError(error: unknown): string {
+  if (error instanceof Error) return error.message;
+  return String(error);
+}

src/types.ts

@@ -0,0 +1,155 @@
+export type SqlCursorRow = object;
+
+export interface SqlStorage {
+  exec<T extends SqlCursorRow = SqlCursorRow>(query: string, ...bindings: unknown[]): Iterable<T>;
+}
+
+export interface DurableObjectStateLike {
+  storage: {
+    sql: SqlStorage;
+  };
+  blockConcurrencyWhile<T>(callback: () => Promise<T> | T): Promise<T>;
+}
+
+export interface DurableObjectIdLike {
+  toString(): string;
+}
+
+export interface DurableObjectStubLike {
+  fetch(input: RequestInfo | URL, init?: RequestInit): Promise<Response>;
+}
+
+export interface DurableObjectNamespaceLike<T = unknown> {
+  idFromName(name: string): DurableObjectIdLike;
+  get(id: DurableObjectIdLike): DurableObjectStubLike;
+}
+
+export interface R2ObjectBodyLike {
+  body: ReadableStream<Uint8Array> | null;
+  size: number;
+  httpMetadata?: {
+    contentType?: string;
+  };
+}
+
+export interface R2BucketLike {
+  put(
+    key: string,
+    value: ArrayBuffer | Uint8Array | string,
+    options?: {
+      httpMetadata?: {
+        contentType?: string;
+      };
+      customMetadata?: Record<string, string>;
+    },
+  ): Promise<void>;
+  get(key: string): Promise<R2ObjectBodyLike | null>;
+  delete(keys: string | string[]): Promise<void>;
+}
+
+export interface EmailAttachment {
+  content: string | ArrayBuffer;
+  filename: string;
+  type: string;
+  disposition: "attachment" | "inline";
+  contentId?: string;
+}
+
+export interface EmailSendMessage {
+  to: string | string[];
+  from: string | { email: string; name: string };
+  subject: string;
+  html?: string;
+  text?: string;
+  cc?: string | string[];
+  bcc?: string | string[];
+  replyTo?: string | { email: string; name: string };
+  attachments?: EmailAttachment[];
+  headers?: Record<string, string>;
+}
+
+export interface EmailBindingLike {
+  send(message: EmailSendMessage): Promise<{ messageId: string }>;
+}
+
+export interface Env {
+  AUTH_KEY: string;
+  DOMAINS: string;
+  DEFAULT_MAILBOX?: string;
+  MAILBOX: DurableObjectNamespaceLike;
+  BUCKET: R2BucketLike;
+  EMAIL?: EmailBindingLike;
+}
+
+export interface StoredAttachmentInput {
+  filename: string;
+  type: string;
+  disposition?: "attachment" | "inline";
+  contentId?: string;
+  contentBase64: string;
+  size?: number;
+}
+
+export interface StoredAttachmentRecord {
+  id: string;
+  email_id: string;
+  r2_key: string;
+  filename: string;
+  mimetype: string;
+  size: number;
+  content_id: string | null;
+  disposition: string | null;
+}
+
+export interface IncomingEmailPayload {
+  id: string;
+  folderId: string;
+  from: string;
+  to: string;
+  cc?: string | null;
+  bcc?: string | null;
+  subject: string;
+  bodyText: string;
+  bodyHtml: string;
+  snippet: string;
+  date: string;
+  messageId: string;
+  inReplyTo?: string | null;
+  references?: string | null;
+  rawHeaders: Record<string, string>;
+  attachments: StoredAttachmentInput[];
+}
+
+export interface SendRequestBody {
+  fromName?: string;
+  to: string | string[];
+  cc?: string | string[];
+  bcc?: string | string[];
+  subject: string;
+  text?: string;
+  html?: string;
+  replyTo?: string;
+  attachments?: StoredAttachmentInput[];
+}
+
+export interface ReplyRequestBody {
+  originalEmailId: string;
+  fromName?: string;
+  text?: string;
+  html?: string;
+  replyAll?: boolean;
+  attachments?: StoredAttachmentInput[];
+}
+
+export interface ForwardRequestBody {
+  originalEmailId: string;
+  to: string | string[];
+  cc?: string | string[];
+  bcc?: string | string[];
+  fromName?: string;
+  subject?: string;
+  introText?: string;
+  introHtml?: string;
+  includeOriginalAttachments?: boolean;
+  attachments?: StoredAttachmentInput[];
+}

src/utils.ts

@@ -0,0 +1,207 @@
+import type { DurableObjectStubLike, Env, StoredAttachmentInput } from "./types";
+
+const REPLY_PREFIX_RE = /^(\s*(?:re|fw|fwd|aw|wg|sv|réf)\s*:\s*)+/i;
+const EMAIL_RE = /([a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)+)/g;
+
+export function json(data: unknown, status = 200, headers?: HeadersInit): Response {
+  return new Response(JSON.stringify(data, null, 2), {
+    status,
+    headers: {
+      "content-type": "application/json; charset=utf-8",
+      ...(headers ?? {}),
+    },
+  });
+}
+
+export function text(data: string, status = 200, headers?: HeadersInit): Response {
+  return new Response(data, { status, headers });
+}
+
+export function badRequest(message: string, details?: unknown): Response {
+  return json({ error: message, details }, 400);
+}
+
+export function unauthorized(): Response {
+  return json({ error: "unauthorized" }, 401);
+}
+
+export function notFound(message = "not found"): Response {
+  return json({ error: message }, 404);
+}
+
+export function serverError(message: string, details?: unknown): Response {
+  return json({ error: message, details }, 500);
+}
+
+export function normalizeEmail(value: string): string {
+  return value.trim().toLowerCase();
+}
+
+export function mailboxStub(env: Env, mailboxId: string): DurableObjectStubLike {
+  const id = env.MAILBOX.idFromName(normalizeEmail(mailboxId));
+  return env.MAILBOX.get(id);
+}
+
+export function assertAuthorized(request: Request, env: Env): boolean {
+  const incoming = request.headers.get("x-auth-key") ?? "";
+  return Boolean(env.AUTH_KEY) && incoming === env.AUTH_KEY;
+}
+
+export function hasOutboundEmailBinding(env: Env): boolean {
+  return Boolean(env.EMAIL && typeof env.EMAIL.send === "function");
+}
+
+export function resolveMailbox(request: Request, env: Env, explicit?: string | null): string | null {
+  const url = new URL(request.url);
+  const mailbox = explicit ?? url.searchParams.get("mailbox") ?? request.headers.get("x-mailbox") ?? env.DEFAULT_MAILBOX ?? "";
+  return mailbox ? normalizeEmail(mailbox) : null;
+}
+
+export function allowedDomains(env: Env): string[] {
+  return String(env.DOMAINS ?? "")
+    .split(",")
+    .map((item) => item.trim().toLowerCase())
+    .filter(Boolean);
+}
+
+export function isAllowedMailbox(mailbox: string, env: Env): boolean {
+  const domains = allowedDomains(env);
+  if (domains.length === 0) return true;
+  const domain = mailbox.split("@")[1] ?? "";
+  return domains.includes(domain.toLowerCase());
+}
+
+export function parseJson<T>(request: Request): Promise<T> {
+  return request.json() as Promise<T>;
+}
+
+export function ensureArray<T>(value: T | T[] | undefined | null): T[] {
+  if (value === undefined || value === null) return [];
+  return Array.isArray(value) ? value : [value];
+}
+
+export function normalizeSubject(subject: string): string {
+  return (subject || "(no subject)").replace(REPLY_PREFIX_RE, "").trim().toLowerCase();
+}
+
+export function extractEmails(value: string | undefined | null): string[] {
+  if (!value) return [];
+  const found = value.match(EMAIL_RE) ?? [];
+  return [...new Set(found.map((item) => normalizeEmail(item)))];
+}
+
+export function buildParticipants(sender: string, recipient: string, cc?: string | null, bcc?: string | null): string {
+  const values = new Set<string>([
+    ...extractEmails(sender),
+    ...extractEmails(recipient),
+    ...extractEmails(cc ?? undefined),
+    ...extractEmails(bcc ?? undefined),
+  ]);
+  return [...values].sort().join(",");
+}
+
+export function participantsOverlap(left: string, right: string): boolean {
+  const a = new Set(left.split(",").map((item) => item.trim()).filter(Boolean));
+  const b = new Set(right.split(",").map((item) => item.trim()).filter(Boolean));
+  for (const value of a) {
+    if (b.has(value)) return true;
+  }
+  return false;
+}
+
+export function normalizeMessageId(value: string | undefined | null): string {
+  if (!value) return "";
+  return value.trim().replace(/^<+|>+$/g, "").toLowerCase();
+}
+
+export function parseReferences(value: string | undefined | null): string[] {
+  if (!value) return [];
+  return value
+    .split(/\s+/)
+    .map((item) => normalizeMessageId(item))
+    .filter(Boolean);
+}
+
+export function buildSnippet(textValue: string, htmlValue: string): string {
+  const source = textValue?.trim() || stripHtml(htmlValue);
+  return source.replace(/\s+/g, " ").trim().slice(0, 220);
+}
+
+export function stripHtml(html: string | undefined | null): string {
+  if (!html) return "";
+  return html.replace(/<style[\s\S]*?<\/style>/gi, " ")
+    .replace(/<script[\s\S]*?<\/script>/gi, " ")
+    .replace(/<[^>]+>/g, " ")
+    .replace(/&nbsp;/g, " ")
+    .replace(/&amp;/g, "&")
+    .replace(/\s+/g, " ")
+    .trim();
+}
+
+export function toBase64(input: ArrayBuffer | Uint8Array | string): string {
+  if (typeof input === "string") {
+    return btoa(input);
+  }
+  const bytes = input instanceof Uint8Array ? input : new Uint8Array(input);
+  let binary = "";
+  const chunk = 0x8000;
+  for (let i = 0; i < bytes.length; i += chunk) {
+    binary += String.fromCharCode(...bytes.subarray(i, i + chunk));
+  }
+  return btoa(binary);
+}
+
+export function fromBase64(input: string): Uint8Array {
+  const binary = atob(input);
+  const bytes = new Uint8Array(binary.length);
+  for (let i = 0; i < binary.length; i++) {
+    bytes[i] = binary.charCodeAt(i);
+  }
+  return bytes;
+}
+
+export function safeFilename(input: string): string {
+  return input.replace(/[\\/:*?"<>|]+/g, "-").trim() || "attachment.bin";
+}
+
+export function quoteHtml(textValue: string): string {
+  return textValue
+    .split("\n")
+    .map((line) => `<blockquote>${escapeHtml(line || " ")}</blockquote>`)
+    .join("\n");
+}
+
+export function escapeHtml(value: string): string {
+  return value
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}
+
+export function makeMessageId(mailbox: string): string {
+  const domain = mailbox.split("@")[1] ?? "localhost";
+  return `${crypto.randomUUID()}@${domain}`;
+}
+
+export function formatAddress(mailbox: string, name?: string): string | { email: string; name: string } {
+  if (!name?.trim()) return mailbox;
+  return { email: mailbox, name: name.trim() };
+}
+
+export function attachmentSize(base64: string): number {
+  const trimmed = base64.replace(/=+$/, "");
+  return Math.floor((trimmed.length * 3) / 4);
+}
+
+export function sanitizeAttachmentInput(input: StoredAttachmentInput): StoredAttachmentInput {
+  return {
+    filename: safeFilename(input.filename),
+    type: input.type || "application/octet-stream",
+    disposition: input.disposition ?? "attachment",
+    contentId: input.contentId ?? undefined,
+    contentBase64: input.contentBase64,
+    size: input.size ?? attachmentSize(input.contentBase64),
+  };
+}

tsconfig.json

@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "skipLibCheck": true,
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "types": [],
+    "baseUrl": ".",
+    // Local JS emission only; Cloudflare deploys from wrangler.jsonc -> src/index.ts.
+    "outDir": "dist"
+  },
+  "include": ["src/**/*.ts", "src/**/*.d.ts"]
+}

worker.js

@@ -1,115 +1 @@
-import PostalMime from "postal-mime";
-
-const MAX_MAILS = 50;
-const STORAGE_KEY = "inbox";
-
-// ─── 收信 Handler ────────────────────────────────────────────────
-export async function email(message, env) {
-  const parser = new PostalMime();
-  const raw = await streamToArrayBuffer(message.raw);
-  const parsed = await parser.parse(raw);
-
-  const mail = {
-    id: crypto.randomUUID(),
-    receivedAt: new Date().toISOString(),
-    from: message.from,
-    to: message.to,
-    subject: parsed.subject ?? "(no subject)",
-    text: parsed.text ?? "",
-    html: parsed.html ?? "",
-    // 只保留附件 metadata，不存 base64 內容，避免撞 KV 25MB 限制
-    attachments: (parsed.attachments ?? []).map((a) => ({
-      filename: a.filename ?? "unknown",
-      mimeType: a.mimeType ?? "application/octet-stream",
-      size: a.content?.byteLength ?? 0,
-    })),
-  };
-
-  const existing = await loadInbox(env);
-  const updated = [mail, ...existing].slice(0, MAX_MAILS);
-  await env.MAIL_KV.put(STORAGE_KEY, JSON.stringify(updated));
-}
-
-// ─── HTTP API Handler ─────────────────────────────────────────────
-export default {
-  email,
-
-  async fetch(request, env) {
-    if (request.headers.get("X-Auth-Key") !== env.AUTH_KEY) {
-      return json({ error: "unauthorized" }, 401);
-    }
-
-    const url = new URL(request.url);
-    const mails = await loadInbox(env);
-
-    // GET /latest → 最新一封完整郵件
-    if (url.pathname === "/latest") {
-      return mails.length ? json(mails[0]) : json({ error: "no mail" }, 404);
-    }
-
-    // GET /mails?limit=10 → 最近 N 封列表（不含正文）
-    if (url.pathname === "/mails" && request.method === "GET") {
-      const limit = Math.min(
-        parseInt(url.searchParams.get("limit") ?? "10"),
-        MAX_MAILS
-      );
-      const list = mails
-        .slice(0, limit)
-        .map(({ id, receivedAt, from, to, subject, attachments }) => ({
-          id,
-          receivedAt,
-          from,
-          to,
-          subject,
-          attachments,
-        }));
-      return json(list);
-    }
-
-    // DELETE /mails → 清空收件匣
-    if (url.pathname === "/mails" && request.method === "DELETE") {
-      await env.MAIL_KV.delete(STORAGE_KEY);
-      return json({ ok: true });
-    }
-
-    // GET /mail/:id → 單封完整內容
-    const match = url.pathname.match(/^\/mail\/(.+)$/);
-    if (match) {
-      const found = mails.find((x) => x.id === match[1]);
-      return found ? json(found) : json({ error: "not found" }, 404);
-    }
-
-    return json({ error: "unknown route" }, 404);
-  },
-};
-
-// ─── 工具函數 ─────────────────────────────────────────────────────
-async function loadInbox(env) {
-  const raw = await env.MAIL_KV.get(STORAGE_KEY);
-  return raw ? JSON.parse(raw) : [];
-}
-
-function json(data, status = 200) {
-  return new Response(JSON.stringify(data, null, 2), {
-    status,
-    headers: { "Content-Type": "application/json" },
-  });
-}
-
-async function streamToArrayBuffer(stream) {
-  const reader = stream.getReader();
-  const chunks = [];
-  while (true) {
-    const { done, value } = await reader.read();
-    if (done) break;
-    chunks.push(value);
-  }
-  const total = chunks.reduce((n, c) => n + c.byteLength, 0);
-  const buf = new Uint8Array(total);
-  let offset = 0;
-  for (const chunk of chunks) {
-    buf.set(chunk, offset);
-    offset += chunk.byteLength;
-  }
-  return buf.buffer;
-}
+export { default, MailboxDO } from "./src/index.ts";

wrangler.jsonc

@@ -0,0 +1,39 @@
+{
+  "$schema": "./node_modules/wrangler/config-schema.json",
+  "name": "ni-mail",
+  "main": "src/index.ts",
+  "compatibility_date": "2026-04-17",
+  "compatibility_flags": [
+    "nodejs_compat"
+  ],
+  "observability": {
+    "enabled": true
+  },
+  "vars": {
+    "DOMAINS": "",
+    "DEFAULT_MAILBOX": ""
+  },
+  "r2_buckets": [
+    {
+      "binding": "BUCKET",
+      "bucket_name": "ni-mail-attachments",
+      "preview_bucket_name": "ni-mail-attachments-preview"
+    }
+  ],
+  "durable_objects": {
+    "bindings": [
+      {
+        "name": "MAILBOX",
+        "class_name": "MailboxDO"
+      }
+    ]
+  },
+  "migrations": [
+    {
+      "tag": "v1",
+      "new_sqlite_classes": [
+        "MailboxDO"
+      ]
+    }
+  ]
+}