import imap from "../../imap.app.mjs";
import { DEFAULT_POLLING_SOURCE_TIMER_INTERVAL } from "@pipedream/platform";
export default {
key: "imap-new-email",
name: "New Email",
description: "Emit new event for each new email in a mailbox",
version: "0.0.4",
type: "source",
dedupe: "unique",
props: {
imap,
db: "$.service.db",
timer: {
label: "Polling interval",
description:
"Pipedream will poll the IMAP server for new emails at this interval",
type: "$.interface.timer",
default: {
intervalSeconds: DEFAULT_POLLING_SOURCE_TIMER_INTERVAL,
},
},
mailbox: {
propDefinition: [
imap,
"mailbox",
],
},
},
methods: {
_getLastUid(mailbox) {
return this.db.get(`lastUid-${mailbox}`);
},
_setLastUid(mailbox, lastUid) {
this.db.set(`lastUid-${mailbox}`, lastUid);
},
_getUidValidity(mailbox) {
return this.db.get(`uidValidity-${mailbox}`);
},
_setUidValidity(mailbox, uidValidity) {
this.db.set(`uidValidity-${mailbox}`, uidValidity);
},
_handleUidValidityChange(mailbox, uidValidity) {
this._setUidValidity(mailbox, uidValidity);
this._setLastUid(mailbox, null);
},
hasNewMessages(box) {
const lastUid = this._getLastUid(box.name);
return !lastUid || box.uidnext > lastUid + 1;
},
generateMeta(message) {
const date = message.attributes?.date ?? new Date();
const ts = Date.parse(date);
return {
id: `${message.attributes?.uid}-${ts}`,
ts,
summary: message.mail?.subject,
};
},
processMessage(message) {
const lastUid = message.attributes?.uid ?? lastUid;
this._setLastUid(this.mailbox, lastUid);
this.$emit(message.mail, this.generateMeta(message));
},
async processMessageStream(stream) {
for await (const message of stream) {
this.processMessage(message);
}
},
async getHistoricalEvents() {
const { mailbox } = this;
const connection = await this.imap.getConnection();
try {
const box = await this.imap.openMailbox(connection, mailbox);
const startSeqno = box.messages.total > 25
? box.messages.total - 24
: 1;
const messageStream = this.imap.fetchMessages(connection, {
startSeqno,
});
await this.processMessageStream(messageStream);
} finally {
await this.imap.closeConnection(connection);
}
},
},
hooks: {
async deploy() {
await this.getHistoricalEvents();
},
},
async run() {
const { mailbox } = this;
const connection = await this.imap.getConnection();
try {
const box = await this.imap.openMailbox(connection, mailbox);
const uidValidity = this._getUidValidity(box.name);
if (uidValidity !== box.uidvalidity) {
this._handleUidValidityChange(box.name, box.uidvalidity);
}
if (!this.hasNewMessages(box)) {
console.log("No new messages since last run");
return;
}
const lastUid = this._getLastUid(box.name);
const messageStream = this.imap.fetchMessages(connection, {
startUid: lastUid && lastUid + 1,
startSeqno: box.messages.total,
});
await this.processMessageStream(messageStream);
} finally {
await this.imap.closeConnection(connection);
}
},
};
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