自动获得outlook最新邮件

const Imap = require("imap");
var MailParser = require("mailparser").MailParser;
let imap = null
const createImapConnection = (username, password) => {
  return new Imap({
    user: username,
    password: password,
    host: "outlook.office365.com",
    port: 993,
    tls: true,
  });
};

const connectImap = () => {
  return new Promise((resolve, reject) => {
    imap.once("ready", () => {
      resolve(imap);
    });

    imap.once("error", (err) => {

      reject(err);
    });
    imap.connect();
  });
};

const openInbox = () => {
  return new Promise((resolve, reject) => {
    imap.openBox("INBOX", true, (err) => {
      if (err) {
        reject(err);
      } else {
        resolve(imap);
      }
    });
  });
};

const waitForNewMail = (cb) => {
  imap.once("mail", () => {
    cb();
  });
};

const newEmailHandler = () => {
  return new Promise((resolve) => {
    imap.search(["UNSEEN"], (_, results) => {
      const f = imap.fetch(results.at(-1), {
        bodies: "",
      });
      f.on("message", (msg) => {
        msg.on("body", (stream) => {
          var parser = new MailParser();
          stream.pipe(parser);
          parser.on("data", (data) => {
            resolve(data)
          });
        });
      });
    });
  });
};
let emits = []
exports.getEmail = async ({ username, password }) => {
  return {
    on: (emitName, emit) => {
      const id = Date.now() + Math.random()
      emits.push({ emitName, emit, id })
    },
    off: (id) => {
      emits = emits.filter(emit => emit.id !== id)
      imap.removeAllListeners()
    },
    connect: async () => {
      try {
        imap = createImapConnection(username, password);
        await connectImap();
        await openInbox();
      } catch (error) {
        imap.removeAllListeners()
        throw error
      }
      waitForNewMail(async () => {
        const data = await newEmailHandler(imap);
        emits.forEach(emit => {
          if (emit.emitName === 'ready') {
            emit.emit(data, emit.id)
          }
        })
        imap.closeBox(() => {
          imap.end();
        });
      });
    },
    disconnect: () => {
      imap.closeBox(() => {
        imap.end();
        imap.removeAllListeners()
      });
    }
  }
};