NewTabPage/js/importExport.js

$(document).ready(function () {
	$("#importExportModal").on("shown.bs.modal", showBookmarkData);

	$("#btnImportDialog").click(importBookmarks);

	$("#exportText").click(function () {
		$("#exportText").select();
	});
});

function showBookmarkData() {
	var openDBRequest = window.indexedDB.open("bookmarks");

	openDBRequest.onsuccess = function (e) {
		var db = e.target.result;

		db.transaction("Groups").objectStore("Groups").getAllKeys().onsuccess = function (evt) {
			var data = JSON.stringify(bookmarkList, null, 4);
			if (data != null)
				$("#exportText").text(data);
			else
				$("#exportText").text("[]");
		}
	}
}

function importBookmarks() {
	try {
		var newData = $.parseJSON($("#importText").val());
	} catch (err) {
		console.error("Import failed: " + err.message);
		window.alert("Invalid Format");
		return;
	}

	if (validateBookmarks(newData)) {
		$("#btnImportDialog").prop("disabled", true);
		setList(newData);
	} else {
		window.alert("Invalid Format");
	}
}

function setList(data) {
	// empty the DB and fill it with the new data
	bookmarkList = data;

	var openDBRequest = window.indexedDB.open("bookmarks");

	openDBRequest.onsuccess = function (e) {
		db = e.target.result;

		var groupStore = db.transaction("Groups", "readwrite").objectStore("Groups");
		groupStore.clear();

		// create the object stores
		for (group of data) {
			groupStore.add(group);
		}

		$("#importExportModal").modal("hide");
		$("#btnImportDialog").prop("disabled", false);

		db.close();
		loadBookmarks();
	}

	openDBRequest.onerror = function (err) { console.error(err); }
}

function validateBookmarks(bookmarks) {
	var indexes = [];

	if (!Array.isArray(bookmarks))
		return false;

	for (var i = 0; i < bookmarks.length; i++) {
		var item = bookmarks[i];

		if (item == null || typeof item != "object")
			return false;

		if (item.title == null || typeof item.title != "string")
			return false;

		if (item.groupIndex == null || typeof item.groupIndex != "number")
			return false;

		if (arrayContains(indexes, item.groupIndex))
			return false;

		indexes.push(item.groupIndex);

		for (var j = 0; j < item.bookmarks.length; j++) {
			var bkmk = item.bookmarks[j];

			if (bkmk == null || typeof bkmk != "object")
				return false;

			if (bkmk.name == null || typeof bkmk.name != "string")
				return false;

			if (bkmk.address == null || typeof bkmk.address != "string")
				return false;
		}
	}

	return true;
}

function arrayContains(array, searchFor) {
	for (item of array) {
		if (item == searchFor)
			return true;
	}

	return false;
}