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-rw-r--r--deno/mail/app.ts83
-rw-r--r--deno/mail/aws/app.ts315
-rw-r--r--deno/mail/aws/deliver.ts63
-rw-r--r--deno/mail/aws/fetch.ts136
-rw-r--r--deno/mail/aws/mail.ts59
-rw-r--r--deno/mail/db.test.ts23
-rw-r--r--deno/mail/db.ts146
-rw-r--r--deno/mail/deno.json18
-rw-r--r--deno/mail/dovecot.ts213
-rw-r--r--deno/mail/dumb-smtp-server.ts129
-rw-r--r--deno/mail/mail-parsing.ts144
-rw-r--r--deno/mail/mail.test.ts121
-rw-r--r--deno/mail/mail.ts234
13 files changed, 1684 insertions, 0 deletions
diff --git a/deno/mail/app.ts b/deno/mail/app.ts
new file mode 100644
index 0000000..332c430
--- /dev/null
+++ b/deno/mail/app.ts
@@ -0,0 +1,83 @@
+import { Hono } from "hono";
+import { logger as honoLogger } from "hono/logger";
+
+import {
+ AliasRecipientMailHook,
+ FallbackRecipientHook,
+ MailDeliverer,
+ RecipientFromHeadersHook,
+} from "./mail.ts";
+import { DovecotMailDeliverer } from "./dovecot.ts";
+import { DumbSmtpServer } from "./dumb-smtp-server.ts";
+
+export function createInbound(
+ {
+ fallback,
+ mailDomain,
+ aliasFile,
+ ldaPath,
+ doveadmPath,
+ }: {
+ fallback: string[];
+ mailDomain: string;
+ aliasFile: string;
+ ldaPath: string;
+ doveadmPath: string;
+ },
+) {
+ const deliverer = new DovecotMailDeliverer(ldaPath, doveadmPath);
+ deliverer.preHooks.push(
+ new RecipientFromHeadersHook(mailDomain),
+ new FallbackRecipientHook(new Set(fallback)),
+ new AliasRecipientMailHook(aliasFile),
+ );
+ return deliverer;
+}
+
+export function createHono(outbound: MailDeliverer, inbound: MailDeliverer) {
+ const hono = new Hono();
+
+ hono.onError((err, c) => {
+ console.error("Hono handler threw an uncaught error.", err);
+ return c.json({ message: "Server error, check its log." }, 500);
+ });
+ hono.use(honoLogger());
+ hono.post("/send/raw", async (context) => {
+ const body = await context.req.text();
+ if (body.trim().length === 0) {
+ return context.json({ message: "Can't send an empty mail." }, 400);
+ } else {
+ const result = await outbound.deliverRaw(body);
+ return context.json({
+ awsMessageId: result.awsMessageId,
+ });
+ }
+ });
+ hono.post("/receive/raw", async (context) => {
+ await inbound.deliverRaw(await context.req.text());
+ return context.json({ message: "Done!" });
+ });
+
+ return hono;
+}
+
+export function createSmtp(outbound: MailDeliverer) {
+ return new DumbSmtpServer(outbound);
+}
+
+export async function sendMail(port: number) {
+ const decoder = new TextDecoder();
+ let text = "";
+ for await (const chunk of Deno.stdin.readable) {
+ text += decoder.decode(chunk);
+ }
+
+ const res = await fetch(`http://127.0.0.1:${port}/send/raw`, {
+ method: "post",
+ body: text,
+ });
+ const fn = res.ok ? "info" : "error";
+ console[fn](res);
+ console[fn](await res.text());
+ if (!res.ok) Deno.exit(-1);
+}
diff --git a/deno/mail/aws/app.ts b/deno/mail/aws/app.ts
new file mode 100644
index 0000000..3c8305d
--- /dev/null
+++ b/deno/mail/aws/app.ts
@@ -0,0 +1,315 @@
+import { join } from "@std/path";
+import { z } from "zod";
+import { Hono } from "hono";
+import { zValidator } from "@hono/zod-validator";
+import { FetchHttpHandler } from "@smithy/fetch-http-handler";
+// @ts-types="npm:@types/yargs"
+import yargs from "yargs";
+
+import { ConfigDefinition, ConfigProvider } from "@crupest/base/config";
+import { CronTask } from "@crupest/base/cron";
+
+import { DbService } from "../db.ts";
+import { createHono, createInbound, createSmtp, sendMail } from "../app.ts";
+import { DovecotMailDeliverer } from "../dovecot.ts";
+import { MailDeliverer } from "../mail.ts";
+import {
+ AwsMailMessageIdRewriteHook,
+ AwsMailMessageIdSaveHook,
+} from "./mail.ts";
+import { AwsMailDeliverer } from "./deliver.ts";
+import { AwsMailFetcher, LiveMailNotFoundError } from "./fetch.ts";
+
+
+const PREFIX = "crupest-mail-server";
+const CONFIG_DEFINITIONS = {
+ dataPath: {
+ description: "Path to save app persistent data.",
+ default: ".",
+ },
+ mailDomain: {
+ description:
+ "The part after `@` of an address. Used to determine local recipients.",
+ },
+ httpHost: {
+ description: "Listening address for http server.",
+ default: "0.0.0.0",
+ },
+ httpPort: { description: "Listening port for http server.", default: "2345" },
+ smtpHost: {
+ description: "Listening address for dumb smtp server.",
+ default: "127.0.0.1",
+ },
+ smtpPort: {
+ description: "Listening port for dumb smtp server.",
+ default: "2346",
+ },
+ ldaPath: {
+ description: "full path of lda executable",
+ default: "/dovecot/libexec/dovecot/dovecot-lda",
+ },
+ doveadmPath: {
+ description: "full path of doveadm executable",
+ default: "/dovecot/bin/doveadm",
+ },
+ inboundFallback: {
+ description: "comma separated addresses used as fallback recipients",
+ default: "",
+ },
+ awsInboundPath: {
+ description: "(random set) path for aws sns",
+ },
+ awsInboundKey: {
+ description: "(random set) http header Authorization for aws sns",
+ },
+ awsRegion: {
+ description: "aws region",
+ },
+ awsUser: {
+ description: "aws access key id",
+ },
+ awsPassword: {
+ description: "aws secret access key",
+ secret: true,
+ },
+ awsMailBucket: {
+ description: "aws s3 bucket saving raw mails",
+ secret: true,
+ },
+} as const satisfies ConfigDefinition;
+
+function createAwsOptions({
+ user,
+ password,
+ region,
+}: {
+ user: string;
+ password: string;
+ region: string;
+}) {
+ return {
+ credentials: () =>
+ Promise.resolve({
+ accessKeyId: user,
+ secretAccessKey: password,
+ }),
+ requestHandler: new FetchHttpHandler(),
+ region,
+ };
+}
+
+function createOutbound(
+ awsOptions: ReturnType<typeof createAwsOptions>,
+ db: DbService,
+ local?: DovecotMailDeliverer,
+) {
+ const deliverer = new AwsMailDeliverer(awsOptions);
+ deliverer.preHooks.push(
+ new AwsMailMessageIdRewriteHook(db.messageIdToAws.bind(db)),
+ );
+ deliverer.postHooks.push(
+ new AwsMailMessageIdSaveHook(
+ async (original, aws, context) => {
+ await db.addMessageIdMap({ message_id: original, aws_message_id: aws });
+ void local?.saveNewSent(context.logTag, context.mail, original);
+ },
+ ),
+ );
+ return deliverer;
+}
+
+function setupAwsHono(
+ hono: Hono,
+ options: {
+ path: string;
+ auth: string;
+ fetcher: AwsMailFetcher;
+ deliverer: MailDeliverer;
+ },
+) {
+ let counter = 1;
+
+ hono.post(
+ `/${options.path}`,
+ async (ctx, next) => {
+ const auth = ctx.req.header("Authorization");
+ if (auth !== options.auth) {
+ return ctx.json({ message: "Bad auth!" }, 403);
+ }
+ await next();
+ },
+ zValidator(
+ "json",
+ z.object({
+ key: z.string(),
+ recipients: z.optional(z.array(z.string())),
+ }),
+ ),
+ async (ctx) => {
+ const { fetcher, deliverer } = options;
+ const { key, recipients } = ctx.req.valid("json");
+ try {
+ await fetcher.deliverLiveMail(
+ `[inbound ${counter++}]`,
+ key,
+ deliverer,
+ recipients,
+ );
+ } catch (e) {
+ if (e instanceof LiveMailNotFoundError) {
+ return ctx.json({ message: e.message });
+ }
+ throw e;
+ }
+ return ctx.json({ message: "Done!" });
+ },
+ );
+}
+
+function createCron(fetcher: AwsMailFetcher, deliverer: MailDeliverer) {
+ return new CronTask({
+ name: "live-mail-recycler",
+ interval: 6 * 3600 * 1000,
+ callback: () => {
+ return fetcher.recycleLiveMails(deliverer);
+ },
+ startNow: true,
+ });
+}
+
+function createBaseServices() {
+ const config = new ConfigProvider(PREFIX, CONFIG_DEFINITIONS);
+ Deno.mkdirSync(config.get("dataPath"), { recursive: true });
+ return { config };
+}
+
+function createAwsFetchOnlyServices() {
+ const services = createBaseServices();
+ const { config } = services;
+
+ const awsOptions = createAwsOptions({
+ user: config.get("awsUser"),
+ password: config.get("awsPassword"),
+ region: config.get("awsRegion"),
+ });
+ const fetcher = new AwsMailFetcher(awsOptions, config.get("awsMailBucket"));
+
+ return { ...services, awsOptions, fetcher };
+}
+
+function createAwsRecycleOnlyServices() {
+ const services = createAwsFetchOnlyServices();
+ const { config } = services;
+
+ const inbound = createInbound({
+ fallback: config.getList("inboundFallback"),
+ ldaPath: config.get("ldaPath"),
+ doveadmPath: config.get("doveadmPath"),
+ aliasFile: join(config.get("dataPath"), "aliases.csv"),
+ mailDomain: config.get("mailDomain"),
+ });
+
+ return { ...services, inbound };
+}
+
+function createAwsServices() {
+ const services = createAwsRecycleOnlyServices();
+ const { config, awsOptions, inbound } = services;
+
+ const dbService = new DbService(join(config.get("dataPath"), "db.sqlite"));
+ const outbound = createOutbound(awsOptions, dbService, inbound);
+
+ return { ...services, dbService, outbound };
+}
+
+function createServerServices() {
+ const services = createAwsServices();
+ const { config, outbound, inbound, fetcher } = services;
+
+ const smtp = createSmtp(outbound);
+ const hono = createHono(outbound, inbound);
+
+ setupAwsHono(hono, {
+ path: config.get("awsInboundPath"),
+ auth: config.get("awsInboundKey"),
+ fetcher,
+ deliverer: inbound,
+ });
+
+ return { ...services, smtp, hono };
+}
+
+function serve(cron: boolean = false) {
+ const { config, fetcher, inbound, smtp, hono } = createServerServices();
+ smtp.serve({
+ hostname: config.get("smtpHost"),
+ port: config.getInt("smtpPort"),
+ });
+ Deno.serve(
+ {
+ hostname: config.get("httpHost"),
+ port: config.getInt("httpPort"),
+ },
+ hono.fetch,
+ );
+
+ if (cron) {
+ createCron(fetcher, inbound);
+ }
+}
+
+async function listLives() {
+ const { fetcher } = createAwsFetchOnlyServices();
+ const liveMails = await fetcher.listLiveMails();
+ console.info(`Total ${liveMails.length}:`);
+ if (liveMails.length !== 0) {
+ console.info(liveMails.join("\n"));
+ }
+}
+
+async function recycleLives() {
+ const { fetcher, inbound } = createAwsRecycleOnlyServices();
+ await fetcher.recycleLiveMails(inbound);
+}
+
+if (import.meta.main) {
+ await yargs(Deno.args)
+ .scriptName("mail")
+ .command({
+ command: "sendmail",
+ describe: "send mail via this server's endpoint",
+ handler: async (_argv) => {
+ const { config } = createBaseServices();
+ await sendMail(config.getInt("httpPort"));
+ },
+ })
+ .command({
+ command: "live",
+ describe: "work with live mails",
+ builder: (builder) => {
+ return builder
+ .command({
+ command: "list",
+ describe: "list live mails",
+ handler: listLives,
+ })
+ .command({
+ command: "recycle",
+ describe: "recycle all live mails",
+ handler: recycleLives,
+ })
+ .demandCommand(1, "One command must be specified.");
+ },
+ handler: () => {},
+ })
+ .command({
+ command: "serve",
+ describe: "start the http and smtp servers",
+ builder: (builder) => builder.option("real", { type: "boolean" }),
+ handler: (argv) => serve(argv.real),
+ })
+ .demandCommand(1, "One command must be specified.")
+ .help()
+ .strict()
+ .parse();
+}
diff --git a/deno/mail/aws/deliver.ts b/deno/mail/aws/deliver.ts
new file mode 100644
index 0000000..0195369
--- /dev/null
+++ b/deno/mail/aws/deliver.ts
@@ -0,0 +1,63 @@
+import {
+ SendEmailCommand,
+ SESv2Client,
+ SESv2ClientConfig,
+} from "@aws-sdk/client-sesv2";
+
+import { Mail, MailDeliverContext, MailDeliverer } from "../mail.ts";
+
+declare module "../mail.ts" {
+ interface MailDeliverResult {
+ awsMessageId?: string;
+ }
+}
+
+export class AwsMailDeliverer extends MailDeliverer {
+ readonly name = "aws";
+ readonly #aws;
+ readonly #ses;
+
+ constructor(aws: SESv2ClientConfig) {
+ super(true);
+ this.#aws = aws;
+ this.#ses = new SESv2Client(aws);
+ }
+
+ protected override async doDeliver(
+ mail: Mail,
+ context: MailDeliverContext,
+ ): Promise<void> {
+ try {
+ const sendCommand = new SendEmailCommand({
+ Content: {
+ Raw: { Data: mail.toUtf8Bytes() },
+ },
+ });
+
+ console.info(context.logTag, "Calling aws send-email api...");
+ const res = await this.#ses.send(sendCommand);
+ if (res.MessageId == null) {
+ console.warn(
+ context.logTag,
+ "AWS send-email returned null message id.",
+ );
+ } else {
+ context.result.awsMessageId =
+ `${res.MessageId}@${this.#aws.region}.amazonses.com`;
+ }
+
+ context.result.smtpMessage =
+ `AWS Message ID: ${context.result.awsMessageId}`;
+ context.result.recipients.set("*", {
+ kind: "success",
+ message: `Succeeded to call aws send-email api.`,
+ });
+ } catch (cause) {
+ context.result.recipients.set("*", {
+ kind: "failure",
+ message: "A JS error was thrown when calling aws send-email." + cause,
+ cause,
+ });
+ }
+ }
+}
diff --git a/deno/mail/aws/fetch.ts b/deno/mail/aws/fetch.ts
new file mode 100644
index 0000000..2154972
--- /dev/null
+++ b/deno/mail/aws/fetch.ts
@@ -0,0 +1,136 @@
+import {
+ CopyObjectCommand,
+ DeleteObjectCommand,
+ GetObjectCommand,
+ ListObjectsV2Command,
+ NoSuchKey,
+ S3Client,
+ S3ClientConfig,
+} from "@aws-sdk/client-s3";
+
+import { DateUtils } from "@crupest/base";
+
+import { Mail } from "../mail.ts";
+import { MailDeliverer } from "../mail.ts";
+
+export class LiveMailNotFoundError extends Error {}
+
+async function s3MoveObject(
+ client: S3Client,
+ bucket: string,
+ path: string,
+ newPath: string,
+): Promise<void> {
+ const copyCommand = new CopyObjectCommand({
+ Bucket: bucket,
+ Key: newPath,
+ CopySource: `${bucket}/${path}`,
+ });
+ await client.send(copyCommand);
+
+ const deleteCommand = new DeleteObjectCommand({
+ Bucket: bucket,
+ Key: path,
+ });
+ await client.send(deleteCommand);
+}
+
+const AWS_SES_S3_SETUP_TAG = "AMAZON_SES_SETUP_NOTIFICATION";
+
+export class AwsMailFetcher {
+ readonly #livePrefix = "mail/live/";
+ readonly #archivePrefix = "mail/archive/";
+ readonly #s3;
+ readonly #bucket;
+
+ constructor(aws: S3ClientConfig, bucket: string) {
+ this.#s3 = new S3Client(aws);
+ this.#bucket = bucket;
+ }
+
+ async listLiveMails(): Promise<string[]> {
+ const listCommand = new ListObjectsV2Command({
+ Bucket: this.#bucket,
+ Prefix: this.#livePrefix,
+ });
+ const res = await this.#s3.send(listCommand);
+
+ if (res.Contents == null) {
+ console.warn("S3 API returned null Content.");
+ return [];
+ }
+
+ const result: string[] = [];
+ for (const object of res.Contents) {
+ if (object.Key == null) {
+ console.warn("S3 API returned null Key.");
+ continue;
+ }
+
+ if (object.Key.endsWith(AWS_SES_S3_SETUP_TAG)) continue;
+
+ result.push(object.Key.slice(this.#livePrefix.length));
+ }
+ return result;
+ }
+
+ async deliverLiveMail(
+ logTag: string,
+ s3Key: string,
+ deliverer: MailDeliverer,
+ recipients?: string[],
+ ) {
+ console.info(logTag, `Fetching live mail ${s3Key}...`);
+ const mailPath = `${this.#livePrefix}${s3Key}`;
+ const command = new GetObjectCommand({
+ Bucket: this.#bucket,
+ Key: mailPath,
+ });
+
+ let rawMail;
+
+ try {
+ const res = await this.#s3.send(command);
+ if (res.Body == null) {
+ throw new Error("S3 API returns a null body.");
+ }
+ rawMail = await res.Body.transformToString();
+ } catch (cause) {
+ if (cause instanceof NoSuchKey) {
+ const message =
+ `Live mail ${s3Key} is not found. Perhaps already delivered?`;
+ console.error(message, cause);
+ throw new LiveMailNotFoundError(message);
+ }
+ throw cause;
+ }
+
+ const mail = new Mail(rawMail);
+ await deliverer.deliver({ mail, recipients });
+
+ const { date } = new Mail(rawMail).parsed;
+ const dateString = date != null
+ ? DateUtils.toFileNameString(date, true)
+ : "invalid-date";
+ const newPath = `${this.#archivePrefix}${dateString}/${s3Key}`;
+
+ console.info(logTag, `Archiving live mail ${s3Key} to ${newPath}...`);
+ await s3MoveObject(this.#s3, this.#bucket, mailPath, newPath);
+
+ console.info(logTag, `Done deliver live mail ${s3Key}.`);
+ }
+
+ async recycleLiveMails(deliverer: MailDeliverer) {
+ console.info("Begin to recycle live mails...");
+ const mails = await this.listLiveMails();
+ console.info(`Found ${mails.length} live mails`);
+ let counter = 1;
+ for (const s3Key of mails) {
+ await this.deliverLiveMail(
+ `[${counter++}/${mails.length}]`,
+ s3Key,
+ deliverer,
+ );
+ }
+ }
+}
diff --git a/deno/mail/aws/mail.ts b/deno/mail/aws/mail.ts
new file mode 100644
index 0000000..26f3ea0
--- /dev/null
+++ b/deno/mail/aws/mail.ts
@@ -0,0 +1,59 @@
+import { MailDeliverContext, MailDeliverHook } from "../mail.ts";
+
+export class AwsMailMessageIdRewriteHook implements MailDeliverHook {
+ readonly #lookup;
+
+ constructor(lookup: (origin: string) => Promise<string | null>) {
+ this.#lookup = lookup;
+ }
+
+ async callback(context: MailDeliverContext): Promise<void> {
+ const addresses = context.mail.simpleFindAllAddresses();
+ for (const address of addresses) {
+ const awsMessageId = await this.#lookup(address);
+ if (awsMessageId != null && awsMessageId.length !== 0) {
+ console.info(
+ context.logTag,
+ `Rewrite address-line string in mail: ${address} => ${awsMessageId}.`,
+ );
+ context.mail.raw = context.mail.raw.replaceAll(address, awsMessageId);
+ }
+ }
+ }
+}
+
+export class AwsMailMessageIdSaveHook implements MailDeliverHook {
+ readonly #record;
+
+ constructor(
+ record: (
+ original: string,
+ aws: string,
+ context: MailDeliverContext,
+ ) => Promise<void>,
+ ) {
+ this.#record = record;
+ }
+
+ async callback(context: MailDeliverContext): Promise<void> {
+ const { messageId } = context.mail.parsed;
+ if (messageId == null) {
+ console.warn(
+ context.logTag,
+ "Original mail doesn't have message id, skip saving message id map.",
+ );
+ return;
+ }
+ if (context.result.awsMessageId != null) {
+ console.info(
+ context.logTag,
+ `Save message id map: ${messageId} => ${context.result.awsMessageId}.`,
+ );
+ context.mail.raw = context.mail.raw.replaceAll(
+ messageId,
+ context.result.awsMessageId,
+ );
+ await this.#record(messageId, context.result.awsMessageId, context);
+ }
+ }
+}
diff --git a/deno/mail/db.test.ts b/deno/mail/db.test.ts
new file mode 100644
index 0000000..60035c4
--- /dev/null
+++ b/deno/mail/db.test.ts
@@ -0,0 +1,23 @@
+import { describe, it } from "@std/testing/bdd";
+import { expect } from "@std/expect/expect";
+
+import { DbService } from "./db.ts";
+
+describe("DbService", () => {
+ const mockRow = {
+ message_id: "mock-message-id@mock.mock",
+ aws_message_id: "mock-aws-message-id@mock.mock",
+ };
+
+ it("works", async () => {
+ const db = new DbService(":memory:");
+ await db.migrate();
+ await db.addMessageIdMap(mockRow);
+ expect(await db.messageIdToAws(mockRow.message_id)).toBe(
+ mockRow.aws_message_id,
+ );
+ expect(await db.messageIdFromAws(mockRow.aws_message_id)).toBe(
+ mockRow.message_id,
+ );
+ });
+});
diff --git a/deno/mail/db.ts b/deno/mail/db.ts
new file mode 100644
index 0000000..062700b
--- /dev/null
+++ b/deno/mail/db.ts
@@ -0,0 +1,146 @@
+import {
+ Generated,
+ Insertable,
+ Kysely,
+ Migration,
+ Migrator,
+ SqliteDatabase,
+ SqliteDialect,
+ SqliteStatement,
+} from "kysely";
+import * as sqlite from "@db/sqlite";
+
+class SqliteStatementAdapter implements SqliteStatement {
+ constructor(public readonly stmt: sqlite.Statement) {}
+
+ get reader(): boolean {
+ return this.stmt.columnNames().length >= 1;
+ }
+
+ all(parameters: readonly unknown[]): unknown[] {
+ return this.stmt.all(...(parameters as sqlite.BindValue[]));
+ }
+
+ iterate(parameters: readonly unknown[]): IterableIterator<unknown> {
+ return this.stmt.iter(...(parameters as sqlite.BindValue[]));
+ }
+
+ run(parameters: readonly unknown[]): {
+ changes: number | bigint;
+ lastInsertRowid: number | bigint;
+ } {
+ const { db } = this.stmt;
+ const totalChangesBefore = db.totalChanges;
+ const changes = this.stmt.run(...(parameters as sqlite.BindValue[]));
+ return {
+ changes: totalChangesBefore === db.totalChanges ? 0 : changes,
+ lastInsertRowid: db.lastInsertRowId,
+ };
+ }
+}
+
+class SqliteDatabaseAdapter implements SqliteDatabase {
+ constructor(public readonly db: sqlite.Database) {}
+
+ prepare(sql: string): SqliteStatementAdapter {
+ return new SqliteStatementAdapter(this.db.prepare(sql));
+ }
+
+ close(): void {
+ this.db.close();
+ }
+}
+
+export class DbError extends Error {}
+
+interface AwsMessageIdMapTable {
+ id: Generated<number>;
+ message_id: string;
+ aws_message_id: string;
+}
+
+interface Database {
+ aws_message_id_map: AwsMessageIdMapTable;
+}
+
+const migrations: Record<string, Migration> = {
+ "0001-init": {
+ // deno-lint-ignore no-explicit-any
+ async up(db: Kysely<any>): Promise<void> {
+ await db.schema
+ .createTable("aws_message_id_map")
+ .addColumn("id", "integer", (col) => col.primaryKey().autoIncrement())
+ .addColumn("message_id", "text", (col) => col.notNull().unique())
+ .addColumn("aws_message_id", "text", (col) => col.notNull().unique())
+ .execute();
+
+ for (const column of ["message_id", "aws_message_id"]) {
+ await db.schema
+ .createIndex(`aws_message_id_map_${column}`)
+ .on("aws_message_id_map")
+ .column(column)
+ .execute();
+ }
+ },
+
+ // deno-lint-ignore no-explicit-any
+ async down(db: Kysely<any>): Promise<void> {
+ await db.schema.dropTable("aws_message_id_map").execute();
+ },
+ },
+};
+
+export class DbService {
+ #db;
+ #kysely;
+ #migrator;
+
+ constructor(public readonly path: string) {
+ this.#db = new sqlite.Database(path);
+ this.#kysely = new Kysely<Database>({
+ dialect: new SqliteDialect({
+ database: new SqliteDatabaseAdapter(this.#db),
+ }),
+ });
+ this.#migrator = new Migrator({
+ db: this.#kysely,
+ provider: {
+ getMigrations(): Promise<Record<string, Migration>> {
+ return Promise.resolve(migrations);
+ },
+ },
+ });
+ }
+
+ async migrate(): Promise<void> {
+ await this.#migrator.migrateToLatest();
+ }
+
+ async addMessageIdMap(
+ mail: Insertable<AwsMessageIdMapTable>,
+ ): Promise<number> {
+ const inserted = await this.#kysely
+ .insertInto("aws_message_id_map")
+ .values(mail)
+ .executeTakeFirstOrThrow();
+ return Number(inserted.insertId!);
+ }
+
+ async messageIdToAws(messageId: string): Promise<string | null> {
+ const row = await this.#kysely
+ .selectFrom("aws_message_id_map")
+ .where("message_id", "=", messageId)
+ .select("aws_message_id")
+ .executeTakeFirst();
+ return row?.aws_message_id ?? null;
+ }
+
+ async messageIdFromAws(awsMessageId: string): Promise<string | null> {
+ const row = await this.#kysely
+ .selectFrom("aws_message_id_map")
+ .where("aws_message_id", "=", awsMessageId)
+ .select("message_id")
+ .executeTakeFirst();
+ return row?.message_id ?? null;
+ }
+}
diff --git a/deno/mail/deno.json b/deno/mail/deno.json
new file mode 100644
index 0000000..9105747
--- /dev/null
+++ b/deno/mail/deno.json
@@ -0,0 +1,18 @@
+{
+ "version": "0.1.0",
+ "tasks": {
+ "run": "deno run -A aws/app.ts",
+ "compile": "deno compile -o out/crupest-relay -A aws/app.ts"
+ },
+ "imports": {
+ "@aws-sdk/client-s3": "npm:@aws-sdk/client-s3@^3.821.0",
+ "@aws-sdk/client-sesv2": "npm:@aws-sdk/client-sesv2@^3.821.0",
+ "@db/sqlite": "jsr:@db/sqlite@^0.12.0",
+ "@hono/zod-validator": "npm:@hono/zod-validator@^0.7.0",
+ "@smithy/fetch-http-handler": "npm:@smithy/fetch-http-handler@^5.0.4",
+ "email-addresses": "npm:email-addresses@^5.0.0",
+ "hono": "npm:hono@^4.7.11",
+ "kysely": "npm:kysely@^0.28.2",
+ "zod": "npm:zod@^3.25.48"
+ }
+}
diff --git a/deno/mail/dovecot.ts b/deno/mail/dovecot.ts
new file mode 100644
index 0000000..4fe2f41
--- /dev/null
+++ b/deno/mail/dovecot.ts
@@ -0,0 +1,213 @@
+import { Mail, MailDeliverContext, MailDeliverer } from "./mail.ts";
+
+// https://doc.dovecot.org/main/core/man/dovecot-lda.1.html
+const ldaExitCodeMessageMap = new Map<number, string>();
+ldaExitCodeMessageMap.set(67, "recipient user not known");
+ldaExitCodeMessageMap.set(75, "temporary error");
+
+type CommandResult = {
+ kind: "exit";
+ status: Deno.CommandStatus;
+ logMessage: string;
+} | { kind: "throw"; cause: unknown; logMessage: string };
+
+async function runCommand(
+ bin: string,
+ options: {
+ logTag: string;
+ args: string[];
+ stdin?: Uint8Array;
+ suppressResultLog?: boolean;
+ errorCodeMessageMap?: Map<number, string>;
+ },
+): Promise<CommandResult> {
+ const { logTag, args, stdin, suppressResultLog, errorCodeMessageMap } =
+ options;
+
+ console.info(logTag, `Run external command ${bin} ${args.join(" ")}`);
+
+ try {
+ // Create and spawn process.
+ const command = new Deno.Command(bin, {
+ args,
+ stdin: stdin == null ? "null" : "piped",
+ });
+ const process = command.spawn();
+
+ // Write stdin if any.
+ if (stdin != null) {
+ const writer = process.stdin.getWriter();
+ await writer.write(stdin);
+ writer.close();
+ }
+
+ // Wait for process to exit.
+ const status = await process.status;
+
+ // Build log message string.
+ let message = `External command exited with code ${status.code}`;
+ if (status.signal != null) message += ` (signal: ${status.signal})`;
+ if (errorCodeMessageMap != null && errorCodeMessageMap.has(status.code)) {
+ message += `, ${errorCodeMessageMap.get(status.code)}`;
+ }
+ message += ".";
+ if (suppressResultLog !== true) console.log(logTag, message);
+
+ // Return result.
+ return {
+ kind: "exit",
+ status,
+ logMessage: message,
+ };
+ } catch (cause) {
+ const message = `A JS error was thrown when invoking external command:`;
+ if (suppressResultLog !== true) console.log(logTag, message);
+ return { kind: "throw", cause, logMessage: message + " " + cause };
+ }
+}
+
+export class DovecotMailDeliverer extends MailDeliverer {
+ readonly name = "dovecot";
+ readonly #ldaPath;
+ readonly #doveadmPath;
+
+ constructor(
+ ldaPath: string,
+ doveadmPath: string,
+ ) {
+ super(false);
+ this.#ldaPath = ldaPath;
+ this.#doveadmPath = doveadmPath;
+ }
+
+ protected override async doDeliver(
+ mail: Mail,
+ context: MailDeliverContext,
+ ): Promise<void> {
+ const utf8Bytes = mail.toUtf8Bytes();
+
+ const recipients = [...context.recipients];
+
+ if (recipients.length === 0) {
+ throw new Error(
+ "Failed to deliver to dovecot, no recipients are specified.",
+ );
+ }
+
+ for (const recipient of recipients) {
+ const result = await runCommand(
+ this.#ldaPath,
+ {
+ logTag: context.logTag,
+ args: ["-d", recipient],
+ stdin: utf8Bytes,
+ suppressResultLog: true,
+ errorCodeMessageMap: ldaExitCodeMessageMap,
+ },
+ );
+
+ if (result.kind === "exit" && result.status.success) {
+ context.result.recipients.set(recipient, {
+ kind: "success",
+ message: result.logMessage,
+ });
+ } else {
+ context.result.recipients.set(recipient, {
+ kind: "failure",
+ message: result.logMessage,
+ });
+ }
+ }
+ }
+
+ #queryArgs(mailbox: string, messageId: string) {
+ return ["mailbox", mailbox, "header", "Message-ID", `<${messageId}>`];
+ }
+
+ async #deleteMail(
+ logTag: string,
+ user: string,
+ mailbox: string,
+ messageId: string,
+ ): Promise<void> {
+ await runCommand(this.#doveadmPath, {
+ logTag,
+ args: ["expunge", "-u", user, ...this.#queryArgs(mailbox, messageId)],
+ });
+ }
+
+ async #saveMail(
+ logTag: string,
+ user: string,
+ mailbox: string,
+ mail: Uint8Array,
+ ) {
+ await runCommand(this.#doveadmPath, {
+ logTag,
+ args: ["save", "-u", user, "-m", mailbox],
+ stdin: mail,
+ });
+ }
+
+ async #markAsRead(
+ logTag: string,
+ user: string,
+ mailbox: string,
+ messageId: string,
+ ) {
+ await runCommand(this.#doveadmPath, {
+ logTag,
+ args: [
+ "flags",
+ "add",
+ "-u",
+ user,
+ "\\Seen",
+ ...this.#queryArgs(mailbox, messageId),
+ ],
+ });
+ }
+
+ async saveNewSent(logTag: string, mail: Mail, messageIdToDelete: string) {
+ console.info(logTag, "Save sent mail and delete ones with old message id.");
+
+ // Try to get from and recipients from headers.
+ const { messageId, from, recipients } = mail.parsed;
+
+ if (from == null) {
+ console.warn(
+ logTag,
+ "Failed to get sender (from) in headers, skip saving.",
+ );
+ return;
+ }
+
+ if (recipients.includes(from)) {
+ // So the mail should lie in the Inbox.
+ console.info(
+ logTag,
+ "One recipient of the mail is the sender itself, skip saving.",
+ );
+ return;
+ }
+
+ await this.#saveMail(logTag, from, "Sent", mail.toUtf8Bytes());
+ if (messageId != null) {
+ await this.#markAsRead(logTag, from, "Sent", messageId);
+ } else {
+ console.warn(
+ "Message id of the mail is not found, skip marking as read.",
+ );
+ }
+
+ console.info(
+ logTag,
+ "Schedule deletion of old mails at 15,30,60 seconds later.",
+ );
+ [15, 30, 60].forEach((seconds) =>
+ setTimeout(() => {
+ void this.#deleteMail(logTag, from, "Sent", messageIdToDelete);
+ }, 1000 * seconds)
+ );
+ }
+}
diff --git a/deno/mail/dumb-smtp-server.ts b/deno/mail/dumb-smtp-server.ts
new file mode 100644
index 0000000..70d5ec0
--- /dev/null
+++ b/deno/mail/dumb-smtp-server.ts
@@ -0,0 +1,129 @@
+import { MailDeliverer } from "./mail.ts";
+
+const CRLF = "\r\n";
+
+function createResponses(host: string, port: number | string) {
+ const serverName = `[${host}]:${port}`;
+ return {
+ serverName,
+ READY: `220 ${serverName} SMTP Ready`,
+ EHLO: `250 ${serverName}`,
+ MAIL: "250 2.1.0 Sender OK",
+ RCPT: "250 2.1.5 Recipient OK",
+ DATA: "354 Start mail input; end with <CRLF>.<CRLF>",
+ QUIT: `211 2.0.0 ${serverName} closing connection`,
+ ACTIVE_CLOSE: "421 4.7.0 Please open a new connection to send more emails",
+ INVALID: "500 5.5.1 Error: command not recognized",
+ } as const;
+}
+
+export class DumbSmtpServer {
+ #deliverer;
+
+ constructor(deliverer: MailDeliverer) {
+ this.#deliverer = deliverer;
+ }
+
+ async #handleConnection(
+ logTag: string,
+ conn: Deno.Conn,
+ responses: ReturnType<typeof createResponses>,
+ ) {
+ using disposeStack = new DisposableStack();
+ disposeStack.defer(() => {
+ console.info(logTag, "Close tcp connection.");
+ conn.close();
+ });
+
+ console.info(logTag, "New tcp connection established.");
+
+ const writer = conn.writable.getWriter();
+ disposeStack.defer(() => writer.releaseLock());
+ const reader = conn.readable.getReader();
+ disposeStack.defer(() => reader.releaseLock());
+
+ const [decoder, encoder] = [new TextDecoder(), new TextEncoder()];
+ const decode = (data: Uint8Array) => decoder.decode(data);
+ const send = async (s: string) => {
+ console.info(logTag, "Send line:", s);
+ await writer.write(encoder.encode(s + CRLF));
+ };
+
+ let buffer: string = "";
+ let rawMail: string | null = null;
+
+ await send(responses["READY"]);
+
+ while (true) {
+ const { value, done } = await reader.read();
+ if (done) break;
+
+ buffer += decode(value);
+
+ while (true) {
+ const eolPos = buffer.indexOf(CRLF);
+ if (eolPos === -1) break;
+
+ const line = buffer.slice(0, eolPos);
+ buffer = buffer.slice(eolPos + CRLF.length);
+
+ if (rawMail == null) {
+ console.info(logTag, "Received line:", line);
+ const upperLine = line.toUpperCase();
+ if (upperLine.startsWith("EHLO") || upperLine.startsWith("HELO")) {
+ await send(responses["EHLO"]);
+ } else if (upperLine.startsWith("MAIL FROM:")) {
+ await send(responses["MAIL"]);
+ } else if (upperLine.startsWith("RCPT TO:")) {
+ await send(responses["RCPT"]);
+ } else if (upperLine === "DATA") {
+ await send(responses["DATA"]);
+ console.info(logTag, "Begin to receive mail data...");
+ rawMail = "";
+ } else if (upperLine === "QUIT") {
+ await send(responses["QUIT"]);
+ return;
+ } else {
+ await send(responses["INVALID"]);
+ return;
+ }
+ } else {
+ if (line === ".") {
+ try {
+ console.info(logTag, "Mail data received, begin to relay...");
+ const { smtpMessage } = await this.#deliverer.deliverRaw(rawMail);
+ await send(`250 2.6.0 ${smtpMessage}`);
+ rawMail = null;
+ } catch (err) {
+ console.error(logTag, "Relay failed.", err);
+ await send("554 5.3.0 Error: check server log");
+ }
+ await send(responses["ACTIVE_CLOSE"]);
+ } else {
+ const dataLine = line.startsWith("..") ? line.slice(1) : line;
+ rawMail += dataLine + CRLF;
+ }
+ }
+ }
+ }
+ }
+
+ async serve(options: { hostname: string; port: number }) {
+ const listener = Deno.listen(options);
+ const responses = createResponses(options.hostname, options.port);
+ console.info(
+ `Dumb SMTP server starts to listen on ${responses.serverName}.`,
+ );
+
+ let counter = 1;
+
+ for await (const conn of listener) {
+ const logTag = `[outbound ${counter++}]`;
+ try {
+ await this.#handleConnection(logTag, conn, responses);
+ } catch (cause) {
+ console.error(logTag, "A JS error was thrown by handler:", cause);
+ }
+ }
+ }
+}
diff --git a/deno/mail/mail-parsing.ts b/deno/mail/mail-parsing.ts
new file mode 100644
index 0000000..8e9697d
--- /dev/null
+++ b/deno/mail/mail-parsing.ts
@@ -0,0 +1,144 @@
+import emailAddresses from "email-addresses";
+
+class MailParsingError extends Error {}
+
+function parseHeaderSection(section: string) {
+ const headers = [] as [key: string, value: string][];
+
+ let field: string | null = null;
+ let lineNumber = 1;
+
+ const handleField = () => {
+ if (field == null) return;
+ const sepPos = field.indexOf(":");
+ if (sepPos === -1) {
+ throw new MailParsingError(
+ `Expect ':' in the header field line: ${field}`,
+ );
+ }
+ headers.push([field.slice(0, sepPos).trim(), field.slice(sepPos + 1)]);
+ field = null;
+ };
+
+ for (const line of section.trimEnd().split(/\r?\n|\r/)) {
+ if (line.match(/^\s/)) {
+ if (field == null) {
+ throw new MailParsingError("Header section starts with a space.");
+ }
+ field += line;
+ } else {
+ handleField();
+ field = line;
+ }
+ lineNumber += 1;
+ }
+
+ handleField();
+
+ return headers;
+}
+
+function findFirst(fields: readonly [string, string][], key: string) {
+ for (const [k, v] of fields) {
+ if (key.toLowerCase() === k.toLowerCase()) return v;
+ }
+ return undefined;
+}
+
+function findMessageId(fields: readonly [string, string][]) {
+ const messageIdField = findFirst(fields, "message-id");
+ if (messageIdField == null) return undefined;
+
+ const match = messageIdField.match(/\<(.*?)\>/);
+ if (match != null) {
+ return match[1];
+ } else {
+ console.warn(`Invalid syntax in header 'message-id': ${messageIdField}`);
+ return undefined;
+ }
+}
+
+function findDate(fields: readonly [string, string][]) {
+ const dateField = findFirst(fields, "date");
+ if (dateField == null) return undefined;
+
+ const date = new Date(dateField);
+ if (isNaN(date.getTime())) {
+ console.warn(`Invalid date string in header 'date': ${dateField}`);
+ return undefined;
+ }
+ return date;
+}
+
+function findFrom(fields: readonly [string, string][]) {
+ const fromField = findFirst(fields, "from");
+ if (fromField == null) return undefined;
+
+ const addr = emailAddresses.parseOneAddress(fromField);
+ return addr?.type === "mailbox" ? addr.address : undefined;
+}
+
+function findRecipients(fields: readonly [string, string][]) {
+ const headers = ["to", "cc", "bcc", "x-original-to"];
+ const recipients = new Set<string>();
+ for (const [key, value] of fields) {
+ if (headers.includes(key.toLowerCase())) {
+ emailAddresses
+ .parseAddressList(value)
+ ?.flatMap((a) => (a.type === "mailbox" ? a : a.addresses))
+ ?.forEach(({ address }) => recipients.add(address));
+ }
+ }
+ return recipients;
+}
+
+function parseSections(raw: string) {
+ const twoEolMatch = raw.match(/(\r?\n)(\r?\n)/);
+ if (twoEolMatch == null) {
+ throw new MailParsingError(
+ "No header/body section separator (2 successive EOLs) found.",
+ );
+ }
+
+ const [eol, sep] = [twoEolMatch[1], twoEolMatch[2]];
+
+ if (eol !== sep) {
+ console.warn("Different EOLs (\\r\\n, \\n) found.");
+ }
+
+ return {
+ header: raw.slice(0, twoEolMatch.index!),
+ body: raw.slice(twoEolMatch.index! + eol.length + sep.length),
+ eol,
+ sep,
+ };
+}
+
+export type ParsedMail = Readonly<{
+ header: string;
+ body: string;
+ sep: string;
+ eol: string;
+ headers: readonly [string, string][];
+ messageId: string | undefined;
+ date: Date | undefined;
+ from: string | undefined;
+ recipients: readonly string[];
+}>;
+
+export function simpleParseMail(raw: string): ParsedMail {
+ const sections = Object.freeze(parseSections(raw));
+ const headers = Object.freeze(parseHeaderSection(sections.header));
+ const messageId = findMessageId(headers);
+ const date = findDate(headers);
+ const from = findFrom(headers);
+ const recipients = Object.freeze([...findRecipients(headers)]);
+ return Object.freeze({
+ ...sections,
+ headers,
+ messageId,
+ date,
+ from,
+ recipients,
+ });
+}
diff --git a/deno/mail/mail.test.ts b/deno/mail/mail.test.ts
new file mode 100644
index 0000000..a8204be
--- /dev/null
+++ b/deno/mail/mail.test.ts
@@ -0,0 +1,121 @@
+import { describe, it } from "@std/testing/bdd";
+import { expect, fn } from "@std/expect";
+
+import { Mail, MailDeliverContext, MailDeliverer } from "./mail.ts";
+
+const mockDate = "Fri, 02 May 2025 08:33:02 +0000";
+const mockMessageId = "mock-message-id@from.mock";
+const mockMessageId2 = "mock-message-id-2@from.mock";
+const mockFromAddress = "mock@from.mock";
+const mockCcAddress = "mock@cc.mock";
+const mockBodyStr = `This is body content.
+Line 2 ${mockMessageId2}
+
+Line 4`;
+const mockHeaders = [
+ ["Content-Disposition", "inline"],
+ ["Content-Transfer-Encoding", "quoted-printable"],
+ ["MIME-Version", "1.0"],
+ ["X-Mailer", "MIME-tools 5.509 (Entity 5.509)"],
+ ["Content-Type", "text/plain; charset=utf-8"],
+ ["From", `"Mock From" <${mockFromAddress}>`],
+ [
+ "To",
+ `"John \\"Big\\" Doe" <john@example.com>, "Alice (Work)" <alice+work@example.com>,
+ undisclosed-recipients:;, "Group: Team" <team@company.com>,
+ "Escaped, Name" <escape@test.com>, just@email.com,
+ "Comment (This is valid)" <comment@domain.net>,
+ "Odd @Chars" <weird!#$%'*+-/=?^_\`{|}~@char-test.com>,
+ "Non-ASCII 用户" <user@例子.中国>,
+ admin@[192.168.1.1]`,
+ ],
+ ["CC", `Mock CC <${mockCcAddress}>`],
+ ["Subject", "A very long mock\n subject"],
+ ["Message-ID", `<${mockMessageId}>`],
+ ["Date", mockDate],
+];
+const mockHeaderStr = mockHeaders.map((h) => h[0] + ": " + h[1]).join("\n");
+const mockMailStr = mockHeaderStr + "\n\n" + mockBodyStr;
+const mockCrlfMailStr = mockMailStr.replaceAll("\n", "\r\n");
+const mockToAddresses = [
+ "john@example.com",
+ "alice+work@example.com",
+ "team@company.com",
+ "escape@test.com",
+ "just@email.com",
+ "comment@domain.net",
+ "weird!#$%'*+-/=?^_`{|}~@char-test.com",
+ "user@例子.中国",
+ "admin@[192.168.1.1]",
+];
+
+describe("Mail", () => {
+ it("simple parse", () => {
+ const { parsed } = new Mail(mockMailStr);
+ expect(parsed.header).toEqual(mockHeaderStr);
+ expect(parsed.body).toEqual(mockBodyStr);
+ expect(parsed.sep).toBe("\n");
+ expect(parsed.eol).toBe("\n");
+ });
+
+ it("simple parse crlf", () => {
+ const { parsed } = new Mail(mockCrlfMailStr);
+ expect(parsed.sep).toBe("\r\n");
+ expect(parsed.eol).toBe("\r\n");
+ });
+
+ it("simple parse date", () => {
+ expect(
+ new Mail(mockMailStr).parsed.date,
+ ).toEqual(new Date(mockDate));
+ });
+
+ it("simple parse headers", () => {
+ expect(
+ new Mail(mockMailStr).parsed.headers,
+ ).toEqual(mockHeaders.map((h) => [h[0], " " + h[1].replaceAll("\n", "")]));
+ });
+
+ it("parse recipients", () => {
+ const mail = new Mail(mockMailStr);
+ expect([...mail.parsed.recipients]).toEqual([
+ ...mockToAddresses,
+ mockCcAddress,
+ ]);
+ });
+
+ it("find all addresses", () => {
+ const mail = new Mail(mockMailStr);
+ expect(mail.simpleFindAllAddresses()).toEqual([
+ "mock@from.mock",
+ "john@example.com",
+ "alice+work@example.com",
+ "team@company.com",
+ "escape@test.com",
+ "just@email.com",
+ "comment@domain.net",
+ "mock@cc.mock",
+ "mock-message-id@from.mock",
+ "mock-message-id-2@from.mock",
+ ]);
+ });
+});
+
+describe("MailDeliverer", () => {
+ class MockMailDeliverer extends MailDeliverer {
+ name = "mock";
+ override doDeliver = fn((_: Mail, ctx: MailDeliverContext) => {
+ ctx.result.recipients.set("*", {
+ kind: "success",
+ message: "success message",
+ });
+ return Promise.resolve();
+ }) as MailDeliverer["doDeliver"];
+ }
+ const mockDeliverer = new MockMailDeliverer(false);
+
+ it("deliver success", async () => {
+ await mockDeliverer.deliverRaw(mockMailStr);
+ expect(mockDeliverer.doDeliver).toHaveBeenCalledTimes(1);
+ });
+});
diff --git a/deno/mail/mail.ts b/deno/mail/mail.ts
new file mode 100644
index 0000000..9cc591c
--- /dev/null
+++ b/deno/mail/mail.ts
@@ -0,0 +1,234 @@
+import { encodeBase64 } from "@std/encoding/base64";
+import { parse } from "@std/csv/parse";
+import { simpleParseMail } from "./mail-parsing.ts";
+
+export class Mail {
+ #raw;
+ #parsed;
+
+ constructor(raw: string) {
+ this.#raw = raw;
+ this.#parsed = simpleParseMail(raw);
+ }
+
+ get raw() {
+ return this.#raw;
+ }
+
+ set raw(value) {
+ this.#raw = value;
+ this.#parsed = simpleParseMail(value);
+ }
+
+ get parsed() {
+ return this.#parsed;
+ }
+
+ toUtf8Bytes(): Uint8Array {
+ const utf8Encoder = new TextEncoder();
+ return utf8Encoder.encode(this.raw);
+ }
+
+ toBase64(): string {
+ return encodeBase64(this.raw);
+ }
+
+ simpleFindAllAddresses(): string[] {
+ const re = /,?\<?([a-z0-9_'+\-\.]+\@[a-z0-9_'+\-\.]+)\>?,?/gi;
+ return [...this.raw.matchAll(re)].map((m) => m[1]);
+ }
+}
+
+export interface MailDeliverRecipientResult {
+ kind: "success" | "failure";
+ message?: string;
+ cause?: unknown;
+}
+
+export class MailDeliverResult {
+ message?: string;
+ smtpMessage?: string;
+ recipients = new Map<string, MailDeliverRecipientResult>();
+ constructor(public mail: Mail) {}
+
+ get hasFailure() {
+ return this.recipients.values().some((v) => v.kind !== "success");
+ }
+
+ generateLogMessage(prefix: string) {
+ const lines = [];
+ if (this.message != null) lines.push(`${prefix} message: ${this.message}`);
+ if (this.smtpMessage != null) {
+ lines.push(`${prefix} smtpMessage: ${this.smtpMessage}`);
+ }
+ for (const [name, result] of this.recipients.entries()) {
+ const { kind, message } = result;
+ lines.push(`${prefix} (${name}): ${kind} ${message}`);
+ }
+ return lines.join("\n");
+ }
+}
+
+export class MailDeliverContext {
+ readonly recipients: Set<string> = new Set();
+ readonly result;
+
+ constructor(public logTag: string, public mail: Mail) {
+ this.result = new MailDeliverResult(this.mail);
+ }
+}
+
+export interface MailDeliverHook {
+ callback(context: MailDeliverContext): Promise<void>;
+}
+
+export abstract class MailDeliverer {
+ #counter = 1;
+ #last?: Promise<void>;
+
+ abstract name: string;
+ preHooks: MailDeliverHook[] = [];
+ postHooks: MailDeliverHook[] = [];
+
+ constructor(public sync: boolean) {}
+
+ protected abstract doDeliver(
+ mail: Mail,
+ context: MailDeliverContext,
+ ): Promise<void>;
+
+ async deliverRaw(rawMail: string) {
+ return await this.deliver({ mail: new Mail(rawMail) });
+ }
+
+ async #deliverCore(context: MailDeliverContext) {
+ for (const hook of this.preHooks) {
+ await hook.callback(context);
+ }
+
+ await this.doDeliver(context.mail, context);
+
+ for (const hook of this.postHooks) {
+ await hook.callback(context);
+ }
+ }
+
+ async deliver(options: {
+ mail: Mail;
+ recipients?: string[];
+ logTag?: string;
+ }): Promise<MailDeliverResult> {
+ const logTag = options.logTag ?? `[${this.name} ${this.#counter}]`;
+ this.#counter++;
+
+ if (this.#last != null) {
+ console.info(logTag, "Wait for last delivering done...");
+ await this.#last;
+ }
+
+ const context = new MailDeliverContext(
+ logTag,
+ options.mail,
+ );
+ options.recipients?.forEach((r) => context.recipients.add(r));
+
+ console.info(context.logTag, "Begin to deliver mail...");
+
+ const deliverPromise = this.#deliverCore(context);
+
+ if (this.sync) {
+ this.#last = deliverPromise.then(() => {}, () => {});
+ }
+
+ await deliverPromise;
+ this.#last = undefined;
+
+ console.info(context.logTag, "Deliver result:");
+ console.info(context.result.generateLogMessage(context.logTag));
+
+ if (context.result.hasFailure) {
+ throw new Error("Failed to deliver to some recipients.");
+ }
+
+ return context.result;
+ }
+}
+
+export class RecipientFromHeadersHook implements MailDeliverHook {
+ constructor(public mailDomain: string) {}
+
+ callback(context: MailDeliverContext) {
+ if (context.recipients.size !== 0) {
+ console.warn(
+ context.logTag,
+ "Recipients are already filled, skip inferring from headers.",
+ );
+ } else {
+ [...context.mail.parsed.recipients].filter((r) =>
+ r.endsWith("@" + this.mailDomain)
+ ).forEach((r) => context.recipients.add(r));
+
+ console.info(
+ context.logTag,
+ "Use recipients inferred from mail headers:",
+ [...context.recipients].join(", "),
+ );
+ }
+ return Promise.resolve();
+ }
+}
+
+export class FallbackRecipientHook implements MailDeliverHook {
+ constructor(public fallback: Set<string> = new Set()) {}
+
+ callback(context: MailDeliverContext) {
+ if (context.recipients.size === 0) {
+ console.info(
+ context.logTag,
+ "Use fallback recipients:" + [...this.fallback].join(", "),
+ );
+ this.fallback.forEach((a) => context.recipients.add(a));
+ }
+ return Promise.resolve();
+ }
+}
+
+export class AliasRecipientMailHook implements MailDeliverHook {
+ #aliasFile;
+
+ constructor(aliasFile: string) {
+ this.#aliasFile = aliasFile;
+ }
+
+ async #parseAliasFile(logTag: string): Promise<Map<string, string>> {
+ const result = new Map();
+ if ((await Deno.stat(this.#aliasFile)).isFile) {
+ const text = await Deno.readTextFile(this.#aliasFile);
+ const csv = parse(text);
+ for (const [real, ...aliases] of csv) {
+ aliases.forEach((a) => result.set(a, real));
+ }
+ } else {
+ console.warn(
+ logTag,
+ `Recipient alias file ${this.#aliasFile} is not found.`,
+ );
+ }
+ return result;
+ }
+
+ async callback(context: MailDeliverContext) {
+ const aliases = await this.#parseAliasFile(context.logTag);
+ for (const recipient of [...context.recipients]) {
+ const realRecipients = aliases.get(recipient);
+ if (realRecipients != null) {
+ console.info(
+ context.logTag,
+ `Recipient alias resolved: ${recipient} => ${realRecipients}.`,
+ );
+ context.recipients.delete(recipient);
+ context.recipients.add(realRecipients);
+ }
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-07-01 10:38:53 +0000