add APIs for getting toolbox items

pages/api/GetCategories.js

@@ -0,0 +1,30 @@
+import manifest from '../../manifest.js';
+
+/**
+ * @brief Get categories list.
+ * Category format:
+ * {
+ *   name: "Category Name",
+ *   id: n
+ * }
+ */
+function getCategories() {
+	let categories = [];
+
+	for (let i = 0; i < manifest.length; i++) {
+		const entry = manifest[i];
+		categories.push({ name: entry.category, id: i });
+	}
+
+	return categories;
+}
+
+export default function handler(req, res) {
+	if (req.method !== "GET") {
+		res.setHeader("Allow", ["GET"]);
+		res.status(405).end(`Method ${req.method} Not Allowed`);
+		return;
+	}
+
+	res.status(200).json(getCategories());
+}

pages/api/GetItems.js

@@ -0,0 +1,43 @@
+import manifest from '../../manifest.js';
+
+/// @brief Check if string can be translated to an integer. Not a float or hexadecimal.
+function isValidInteger(inStr) {
+	return typeof inStr === "string" && /^-?\d+$/.test(inStr);
+}
+
+export default function handler(req, res) {
+	if (req.method !== "GET")
+	{
+		res.setHeader("Allow", ["GET"]);
+		res.status(405).end(`Method ${req.method} Not Allowed`);
+		return;
+	}
+
+	let categoryID = req.query.category;
+
+	// if no category chosen, send all categories
+	if (categoryID === undefined)
+	{
+		res.status(200).json({ categories: manifest });
+		return;
+	}
+
+	// if categoryID exists but not valid integer
+	if (!isValidInteger(categoryID))
+	{
+		res.status(400).end(`400 Bad Request\nInvalid category ID "${categoryID}"; Non-integer.`);
+		return;
+	}
+
+	categoryID = Number(categoryID);
+
+	// validate categoryID
+	if (categoryID < 0 || categoryID >= manifest.length)
+	{
+		res.status(400).end(`400 Bad Request\nInvalid category ID "${categoryID}"; Out of bounds, category length is ${manifest.length}.`);
+		return;
+	}
+
+	const items = manifest[categoryID];
+	res.status(200).json(items);
+}