added playlist retrieval route, redis store

controllers/playlists.js

@@ -0,0 +1,84 @@
+require('dotenv').config();
+const logger = require("../utils/logger")(module);
+
+const typedefs = require("../typedefs");
+const { axiosInstance } = require('../axios');
+
+/**
+ * Retrieve list of all of user's playlists
+ * @param {typedefs.Req} req
+ * @param {typedefs.Res} res
+ */
+const getUserPlaylists = async (req, res) => {
+	try {
+		// get first 50
+		const response = await axiosInstance.get(
+			"/me/playlists",
+			{
+				params: {
+					offset: 0,
+					limit: 50,
+				},
+				headers: {
+					...req.authHeader
+				}
+			}
+		);
+
+		let playlists = {};
+
+		playlists.items = response.data.items.map((playlist) => {
+			return {
+				name: playlist.name,
+				description: playlist.description,
+				owner: playlist.owner.display_name,
+				images: playlist.images.map((image) => image.url),
+				link: playlist.external_urls.spotify,
+				collaborative: playlist.collaborative,
+				public: playlist.public,
+				id: playlist.id,
+			}
+		});
+
+		playlists.total = response.data.total;
+		playlists.next = response.data.next;
+
+		// keep getting batches of 50 more till exhausted
+		while (playlists.next) {
+			const nextResponse = await axiosInstance.get(
+				playlists.next, // absolute URL which has params
+				{
+					headers: {
+						...req.authHeader
+					}
+				}
+			);
+
+			playlists.items.push(
+				...nextResponse.data.items.map((playlist) => {
+					return {
+						name: playlist.name,
+						description: playlist.description,
+						owner: playlist.owner.display_name,
+						images: playlist.images.map((image) => image.url),
+						link: playlist.external_urls.spotify,
+						collaborative: playlist.collaborative,
+						public: playlist.public,
+						id: playlist.id,
+					}
+				})
+			);
+
+			playlists.next = nextResponse.data.next;
+		}
+
+		return res.status(200).send(playlists);
+	} catch (error) {
+		logger.error('Error', { error });
+		return res.status(500).send({ message: "Server Error. Try again." });
+	}
+}
+
+module.exports = {
+	getUserPlaylists
+};