Automatically download CSV statements from Discover
// ==UserScript==
// @name Discover CSV Statement Downloader
// @namespace Violentmonkey Scripts
// @license MIT
// @version 1.1
// @description Automatically download CSV statements from Discover
// @match https://*.discover.com/*
// @grant GM_download
// @grant GM_xmlhttpRequest
// ==/UserScript==
(function () {
'use strict';
// src/common.ts
async function getElement(selector, POLL_INTERVAL) {
return new Promise((resolve) => {
const check = setInterval(() => {
let el;
if (typeof selector === "string") {
el = document.querySelector(selector);
} else {
el = Array.from(selector).map((s) => document.querySelector(s)).find(Boolean);
}
if (el) {
clearInterval(check);
resolve(el);
}
}, POLL_INTERVAL);
});
}
function formatDateYYYYMMDD(date) {
return `${date.getFullYear()}${(date.getMonth() + 1).toString().padStart(2, "0")}${date.getDate().toString().padStart(2, "0")}`;
}
function getDateRange(today, endOnBusiness = false) {
let date = new Date(today);
if (endOnBusiness) {
if (date.getDay() === 0) {
date.setDate(date.getDate() - 2);
} else if (date.getDay() === 6) {
date.setDate(date.getDate() - 1);
} else {
date.setDate(date.getDate() - 1);
if (date.getDay() === 0) {
date.setDate(date.getDate() - 2);
} else if (date.getDay() === 6) {
date.setDate(date.getDate() - 1);
}
}
}
let start;
if (date.getMonth() >= 2) {
start = new Date(date.getFullYear(), 0, 1);
} else {
start = new Date(date.getFullYear() - 1, 6, 1);
}
return [start, date];
}
function GM_xmlhttpRequest_promise(pack) {
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({ ...pack, onload: resolve, onerror: reject });
});
}
async function easyRequest({ url, method, payload, headers }) {
function helper() {
if (method === "GET") {
const U = new URL(url);
payload?.forEach((value, key) => U.searchParams.append(decodeURIComponent(key), decodeURIComponent(value)));
return GM_xmlhttpRequest_promise({ method: "GET", url: U.toString(), headers });
} else if (method === "POST.url") {
return GM_xmlhttpRequest_promise({
method: "POST",
url,
data: payload?.toString(),
headers: { "Content-Type": "application/x-www-form-urlencoded", ...headers }
});
} else if (method === "POST.form") {
const formData = new FormData;
payload?.forEach((value, key) => formData.append(decodeURIComponent(key), decodeURIComponent(value)));
return GM_xmlhttpRequest_promise({ method: "POST", url, data: formData, headers });
} else if (method === "POST.json") {
const _headers = new Map(Object.entries(headers || {}));
if (!(_headers.get("Content-Type") || _headers.has("content-type"))) {
_headers.set("Content-Type", "application/json");
}
return GM_xmlhttpRequest_promise({
method: "POST",
url,
data: JSON.stringify(payload),
headers: Object.fromEntries(_headers)
});
}
throw new Error(`Unsupported method: ${method}`);
}
const { status, responseText } = await helper();
if (status !== 200) {
throw new Error(`Request failed: ${status} ${responseText}`);
}
return responseText;
}
async function easyDownload({ content, name, saveAs = true }) {
let type;
if (name.endsWith(".qfx"))
type = "application/x-qfx";
else if (name.endsWith(".csv"))
type = "text/csv";
else
type = "application/octet-stream";
await GM_download_promise({
url: URL.createObjectURL(new Blob([content.trim()], { type })),
name,
saveAs
});
}
function GM_download_promise(option) {
const { url, name, saveAs } = option;
return new Promise((resolve, reject) => {
GM_download({ url, name, saveAs, onload: resolve, onerror: reject });
});
}
function trimAccountName(name) {
return name.trim().replace(/[\s-.]+/g, "").replace(/[\u2122\u00AE\u00A9]/g, "");
}
// src/discover/lib.ts
var BANK_ID = "discover";
var LOGGER_prefix = `[${BANK_ID} Downloader]`;
var POLL_INTERVAL = 500;
async function addDownloadButton() {
const container = await getElement("#print-container", POLL_INTERVAL);
const CLASS = "my-download-btn";
if (container.querySelector(`.${CLASS}`))
return;
const btn = document.createElement("button");
btn.textContent = "Download CSV";
btn.className = CLASS;
btn.style.cssText = `
padding: 4px 4px;
margin: 12px 12px 0px 0px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
width: fit-content;
`;
btn.addEventListener("click", async () => {
try {
await fireDownloadProcess();
} catch (err) {
console.error(`[${BANK_ID} Downloader] Error:`, err);
}
});
container.insertBefore(btn, container.firstChild);
}
async function fireDownloadProcess() {
const accountName = (await getElement(".account-name", POLL_INTERVAL)).textContent;
const last_four = await getElement(".last-four-digits", POLL_INTERVAL);
const lastFourDigits = (last_four.textContent || "").replace(/\D/g, "");
console.log(`Account name: ${accountName}, Last four digits: ${lastFourDigits}`);
const [content, endDate] = await routine();
await easyDownload({
content,
name: `${BANK_ID}_${trimAccountName(accountName)}_${lastFourDigits}_${endDate}_12mo.csv`,
saveAs: true
});
}
async function routine() {
const payload = new URLSearchParams;
const [startDate, endDate] = getDateRange(new Date);
const eStr = formatDateYYYYMMDD(endDate);
payload.append("date", "all");
payload.append("sortColumn", "trans_date");
payload.append("grouping", "-1");
payload.append("printView", "false");
payload.append("sortOrder", "Y");
payload.append("transaction", "-1");
payload.append("printOption", "transactions");
payload.append("way", "actvt");
payload.append("includePend", "Y");
payload.append("outputFormat", "csv");
const response = await easyRequest({
url: "https://card.discover.com/cardmembersvcs/statements/app/stmt.download",
method: "GET",
payload,
headers: {}
});
return [response, eStr];
}
// src/discover/index.ts
try {
addDownloadButton();
const observer = new MutationObserver(addDownloadButton);
observer.observe(document.body, { childList: true, subtree: true });
} catch (err) {
console.error("[Discover Downloader] Error:", err);
}
})();