Compiled protobuf

.gitignore

@@ -0,0 +1,3 @@
+node_modules
+.env
+package-lock.json

README.md

@@ -8,3 +8,9 @@ Ce projet a pour objectif de réaliser des actions via l'API de Spotify afin de
 - Contrôler le lecteur de musique
 - Visualiser les canvas d'éléments de Spotify
 - Récupérer des informations supplémentaires non-affichées dans l'application
+
+## Utilisation
+
+Afin d'utiliser ce module, il est nécessaire de créer un fichier `.env` à la racine du projet contenant les variables d'environnement suivantes :
+
+`SPOTIFY_CLIENT_ID='<your-spotify-client-id>'`

main.js

@@ -0,0 +1,13 @@
+const SpotifyController = require('./src/spotify.js')
+
+var spotifyController = new SpotifyController().then(initializingSuccess, printError)
+
+// SpotifyController initialized
+function initializingSuccess(result) {
+    console.log(result)
+}
+
+// Print the error to the console
+function printError(error) {
+    console.log(error)
+}

package.json

@@ -0,0 +1,23 @@
+{
+  "name": "spotifycontroller",
+  "version": "0.1.0",
+  "description": "Get all the spotify data with NodeJS!",
+  "main": "main.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://factory.vbprojects.fr/thinkode/SpotifyController.git"
+  },
+  "author": "V. Boulanger",
+  "license": "ISC",
+  "dependencies": {
+    "axios": "^1.4.0",
+    "base64url": "^3.0.1",
+    "crypto": "^1.0.1",
+    "express": "^4.18.2",
+    "opn": "^6.0.0",
+    "randomstring": "^1.3.0"
+  }
+}

src/configuration.js

@@ -0,0 +1,16 @@
+const SpotifyEndpoints = {
+    GET_USER_TOKEN_ENDPOINT: "https://accounts.spotify.com/api/token",
+    GET_USER_PROFILE_ENDPOINT: 'https://api.spotify.com/v1/me'
+}
+
+const AuthorizationScopes = [
+    'user-read-private',
+    'user-read-email',
+    'user-top-read',
+    'user-read-currently-playing'
+]
+
+module.exports = {
+    SpotifyEndpoints,
+    AuthorizationScopes
+};

src/protobuf/api.proto

@@ -0,0 +1,31 @@
+syntax = "proto3";
+
+package com.spotify.api;
+
+// Request used to get a new token for the current user
+message GetUserTokenRequest {
+    // The client id
+    string client_id = 1;
+    // The grant type
+    string grant_type = 2;
+    // The code returned by the authorization server
+    string code = 3;
+    // The redirect uri
+    string redirect_uri = 4;
+    // The client secret
+    string code_verifier = 5;
+}
+
+// Reponse of the GetUserTokenRequest
+message GetUserTokenResponse {
+    // The user access token
+    string access_token = 1;
+    // The token type
+    string token_type = 2;
+    // The time in seconds before the access token expires
+    int32 expires_in = 3;
+    // The token used to refresh the user token
+    string refresh_token = 4;
+    // A space-separated list of scopes which have been granted for this access_token
+    string scope = 5;
+}

src/protobuf/api_pb.js

@@ -0,0 +1,568 @@
+// source: src/protobuf/api.proto
+/**
+ * @fileoverview
+ * @enhanceable
+ * @suppress {missingRequire} reports error on implicit type usages.
+ * @suppress {messageConventions} JS Compiler reports an error if a variable or
+ *     field starts with 'MSG_' and isn't a translatable message.
+ * @public
+ */
+// GENERATED CODE -- DO NOT EDIT!
+/* eslint-disable */
+// @ts-nocheck
+
+var jspb = require('google-protobuf');
+var goog = jspb;
+var global =
+    (typeof globalThis !== 'undefined' && globalThis) ||
+    (typeof window !== 'undefined' && window) ||
+    (typeof global !== 'undefined' && global) ||
+    (typeof self !== 'undefined' && self) ||
+    (function () { return this; }).call(null) ||
+    Function('return this')();
+
+goog.exportSymbol('proto.com.spotify.api.GetUserTokenRequest', null, global);
+goog.exportSymbol('proto.com.spotify.api.GetUserTokenResponse', null, global);
+/**
+ * Generated by JsPbCodeGenerator.
+ * @param {Array=} opt_data Optional initial data array, typically from a
+ * server response, or constructed directly in Javascript. The array is used
+ * in place and becomes part of the constructed object. It is not cloned.
+ * If no data is provided, the constructed object will be empty, but still
+ * valid.
+ * @extends {jspb.Message}
+ * @constructor
+ */
+proto.com.spotify.api.GetUserTokenRequest = function(opt_data) {
+  jspb.Message.initialize(this, opt_data, 0, -1, null, null);
+};
+goog.inherits(proto.com.spotify.api.GetUserTokenRequest, jspb.Message);
+if (goog.DEBUG && !COMPILED) {
+  /**
+   * @public
+   * @override
+   */
+  proto.com.spotify.api.GetUserTokenRequest.displayName = 'proto.com.spotify.api.GetUserTokenRequest';
+}
+/**
+ * Generated by JsPbCodeGenerator.
+ * @param {Array=} opt_data Optional initial data array, typically from a
+ * server response, or constructed directly in Javascript. The array is used
+ * in place and becomes part of the constructed object. It is not cloned.
+ * If no data is provided, the constructed object will be empty, but still
+ * valid.
+ * @extends {jspb.Message}
+ * @constructor
+ */
+proto.com.spotify.api.GetUserTokenResponse = function(opt_data) {
+  jspb.Message.initialize(this, opt_data, 0, -1, null, null);
+};
+goog.inherits(proto.com.spotify.api.GetUserTokenResponse, jspb.Message);
+if (goog.DEBUG && !COMPILED) {
+  /**
+   * @public
+   * @override
+   */
+  proto.com.spotify.api.GetUserTokenResponse.displayName = 'proto.com.spotify.api.GetUserTokenResponse';
+}
+
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * Optional fields that are not set will be set to undefined.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ *     net/proto2/compiler/js/internal/generator.cc#kKeyword.
+ * @param {boolean=} opt_includeInstance Deprecated. whether to include the
+ *     JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.toObject = function(opt_includeInstance) {
+  return proto.com.spotify.api.GetUserTokenRequest.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Deprecated. Whether to include
+ *     the JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @param {!proto.com.spotify.api.GetUserTokenRequest} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.com.spotify.api.GetUserTokenRequest.toObject = function(includeInstance, msg) {
+  var f, obj = {
+    clientId: jspb.Message.getFieldWithDefault(msg, 1, ""),
+    grantType: jspb.Message.getFieldWithDefault(msg, 2, ""),
+    code: jspb.Message.getFieldWithDefault(msg, 3, ""),
+    redirectUri: jspb.Message.getFieldWithDefault(msg, 4, ""),
+    codeVerifier: jspb.Message.getFieldWithDefault(msg, 5, "")
+  };
+
+  if (includeInstance) {
+    obj.$jspbMessageInstance = msg;
+  }
+  return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.com.spotify.api.GetUserTokenRequest}
+ */
+proto.com.spotify.api.GetUserTokenRequest.deserializeBinary = function(bytes) {
+  var reader = new jspb.BinaryReader(bytes);
+  var msg = new proto.com.spotify.api.GetUserTokenRequest;
+  return proto.com.spotify.api.GetUserTokenRequest.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.com.spotify.api.GetUserTokenRequest} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.com.spotify.api.GetUserTokenRequest}
+ */
+proto.com.spotify.api.GetUserTokenRequest.deserializeBinaryFromReader = function(msg, reader) {
+  while (reader.nextField()) {
+    if (reader.isEndGroup()) {
+      break;
+    }
+    var field = reader.getFieldNumber();
+    switch (field) {
+    case 1:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setClientId(value);
+      break;
+    case 2:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setGrantType(value);
+      break;
+    case 3:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setCode(value);
+      break;
+    case 4:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setRedirectUri(value);
+      break;
+    case 5:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setCodeVerifier(value);
+      break;
+    default:
+      reader.skipField();
+      break;
+    }
+  }
+  return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.serializeBinary = function() {
+  var writer = new jspb.BinaryWriter();
+  proto.com.spotify.api.GetUserTokenRequest.serializeBinaryToWriter(this, writer);
+  return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.com.spotify.api.GetUserTokenRequest} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.com.spotify.api.GetUserTokenRequest.serializeBinaryToWriter = function(message, writer) {
+  var f = undefined;
+  f = message.getClientId();
+  if (f.length > 0) {
+    writer.writeString(
+      1,
+      f
+    );
+  }
+  f = message.getGrantType();
+  if (f.length > 0) {
+    writer.writeString(
+      2,
+      f
+    );
+  }
+  f = message.getCode();
+  if (f.length > 0) {
+    writer.writeString(
+      3,
+      f
+    );
+  }
+  f = message.getRedirectUri();
+  if (f.length > 0) {
+    writer.writeString(
+      4,
+      f
+    );
+  }
+  f = message.getCodeVerifier();
+  if (f.length > 0) {
+    writer.writeString(
+      5,
+      f
+    );
+  }
+};
+
+
+/**
+ * optional string client_id = 1;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.getClientId = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenRequest} returns this
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.setClientId = function(value) {
+  return jspb.Message.setProto3StringField(this, 1, value);
+};
+
+
+/**
+ * optional string grant_type = 2;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.getGrantType = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 2, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenRequest} returns this
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.setGrantType = function(value) {
+  return jspb.Message.setProto3StringField(this, 2, value);
+};
+
+
+/**
+ * optional string code = 3;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.getCode = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 3, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenRequest} returns this
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.setCode = function(value) {
+  return jspb.Message.setProto3StringField(this, 3, value);
+};
+
+
+/**
+ * optional string redirect_uri = 4;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.getRedirectUri = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 4, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenRequest} returns this
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.setRedirectUri = function(value) {
+  return jspb.Message.setProto3StringField(this, 4, value);
+};
+
+
+/**
+ * optional string code_verifier = 5;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.getCodeVerifier = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 5, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenRequest} returns this
+ */
+proto.com.spotify.api.GetUserTokenRequest.prototype.setCodeVerifier = function(value) {
+  return jspb.Message.setProto3StringField(this, 5, value);
+};
+
+
+
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * Optional fields that are not set will be set to undefined.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ *     net/proto2/compiler/js/internal/generator.cc#kKeyword.
+ * @param {boolean=} opt_includeInstance Deprecated. whether to include the
+ *     JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.toObject = function(opt_includeInstance) {
+  return proto.com.spotify.api.GetUserTokenResponse.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Deprecated. Whether to include
+ *     the JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @param {!proto.com.spotify.api.GetUserTokenResponse} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.com.spotify.api.GetUserTokenResponse.toObject = function(includeInstance, msg) {
+  var f, obj = {
+    accessToken: jspb.Message.getFieldWithDefault(msg, 1, ""),
+    tokenType: jspb.Message.getFieldWithDefault(msg, 2, ""),
+    expiresIn: jspb.Message.getFieldWithDefault(msg, 3, 0),
+    refreshToken: jspb.Message.getFieldWithDefault(msg, 4, ""),
+    scope: jspb.Message.getFieldWithDefault(msg, 5, "")
+  };
+
+  if (includeInstance) {
+    obj.$jspbMessageInstance = msg;
+  }
+  return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.com.spotify.api.GetUserTokenResponse}
+ */
+proto.com.spotify.api.GetUserTokenResponse.deserializeBinary = function(bytes) {
+  var reader = new jspb.BinaryReader(bytes);
+  var msg = new proto.com.spotify.api.GetUserTokenResponse;
+  return proto.com.spotify.api.GetUserTokenResponse.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.com.spotify.api.GetUserTokenResponse} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.com.spotify.api.GetUserTokenResponse}
+ */
+proto.com.spotify.api.GetUserTokenResponse.deserializeBinaryFromReader = function(msg, reader) {
+  while (reader.nextField()) {
+    if (reader.isEndGroup()) {
+      break;
+    }
+    var field = reader.getFieldNumber();
+    switch (field) {
+    case 1:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setAccessToken(value);
+      break;
+    case 2:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setTokenType(value);
+      break;
+    case 3:
+      var value = /** @type {number} */ (reader.readInt32());
+      msg.setExpiresIn(value);
+      break;
+    case 4:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setRefreshToken(value);
+      break;
+    case 5:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setScope(value);
+      break;
+    default:
+      reader.skipField();
+      break;
+    }
+  }
+  return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.serializeBinary = function() {
+  var writer = new jspb.BinaryWriter();
+  proto.com.spotify.api.GetUserTokenResponse.serializeBinaryToWriter(this, writer);
+  return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.com.spotify.api.GetUserTokenResponse} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.com.spotify.api.GetUserTokenResponse.serializeBinaryToWriter = function(message, writer) {
+  var f = undefined;
+  f = message.getAccessToken();
+  if (f.length > 0) {
+    writer.writeString(
+      1,
+      f
+    );
+  }
+  f = message.getTokenType();
+  if (f.length > 0) {
+    writer.writeString(
+      2,
+      f
+    );
+  }
+  f = message.getExpiresIn();
+  if (f !== 0) {
+    writer.writeInt32(
+      3,
+      f
+    );
+  }
+  f = message.getRefreshToken();
+  if (f.length > 0) {
+    writer.writeString(
+      4,
+      f
+    );
+  }
+  f = message.getScope();
+  if (f.length > 0) {
+    writer.writeString(
+      5,
+      f
+    );
+  }
+};
+
+
+/**
+ * optional string access_token = 1;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.getAccessToken = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenResponse} returns this
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.setAccessToken = function(value) {
+  return jspb.Message.setProto3StringField(this, 1, value);
+};
+
+
+/**
+ * optional string token_type = 2;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.getTokenType = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 2, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenResponse} returns this
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.setTokenType = function(value) {
+  return jspb.Message.setProto3StringField(this, 2, value);
+};
+
+
+/**
+ * optional int32 expires_in = 3;
+ * @return {number}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.getExpiresIn = function() {
+  return /** @type {number} */ (jspb.Message.getFieldWithDefault(this, 3, 0));
+};
+
+
+/**
+ * @param {number} value
+ * @return {!proto.com.spotify.api.GetUserTokenResponse} returns this
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.setExpiresIn = function(value) {
+  return jspb.Message.setProto3IntField(this, 3, value);
+};
+
+
+/**
+ * optional string refresh_token = 4;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.getRefreshToken = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 4, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenResponse} returns this
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.setRefreshToken = function(value) {
+  return jspb.Message.setProto3StringField(this, 4, value);
+};
+
+
+/**
+ * optional string scope = 5;
+ * @return {string}
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.getScope = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 5, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.com.spotify.api.GetUserTokenResponse} returns this
+ */
+proto.com.spotify.api.GetUserTokenResponse.prototype.setScope = function(value) {
+  return jspb.Message.setProto3StringField(this, 5, value);
+};
+
+
+goog.object.extend(exports, proto.com.spotify.api);

src/spotify.js

@@ -0,0 +1,142 @@
+const axios = require('axios')
+const dotenv = require('dotenv')
+const configuration = require('./configuration.js')
+const randomstring = require('randomstring')
+const base64url = require('base64url')
+const crypto = require('crypto')
+const opn = require('opn')
+const express = require('express')
+
+class SpotifyController {
+    // Creates a new SpotifyController instance with the given clientId
+    constructor() {   
+        return new Promise((resolve, reject) => {
+            dotenv.config()
+            // For connection management
+            this.clientId = process.env.SPOTIFY_CLIENT_ID
+            // For user token management
+            this.userToken = undefined
+            this.userTokenExpiringDate = undefined
+            this.refreshToken = undefined
+            // For canvas token management
+            this.canvasToken = undefined
+            this.canvasTokenExpiringDate = undefined
+            // Check client ID
+            if (this.clientId === undefined || this.clientId === null || this.clientId === '') {
+                reject('Spotify client ID not set. Please define this variable in the .env file.')
+            }
+            this.checkUserToken().then(resolve("User token got."), reject("Error requesting a user token"))           
+            resolve("SpotifyController initialized.")
+        })
+    }
+
+    // This function aims to get a valid user token for the Spotify API
+    async checkUserToken() {
+        return new Promise((resolve, reject) => {
+            if (this.userToken === undefined) {
+                // Get a new token with auth
+                this.requestAuthentication().then(resolve("User token requested"), reject("Error requesting user token"))
+            } else if (this.userTokenExpiringDate < new Date()) {
+                // Refresh the user token
+                refreshUserToken().then(resolve("User token refreshed"), reject("Error refreshing user token"))
+            }
+            resolve("User token is already valid")
+        })
+    }
+
+    // This function aims to get a user token with authentication 
+    async requestAuthentication() {
+        let clientId = this.clientId
+        return new Promise((resolve, reject) => {
+            //Generate a code verifier
+            const codeVerifier = randomstring.generate(128);
+            const codechallenge = base64url.fromBase64(crypto.createHash("sha256").update(codeVerifier).digest("base64"))               
+            // Create the authentication URL
+            let args = new URLSearchParams({
+                response_type: 'code',
+                client_id: clientId,
+                scope: configuration.AuthorizationScopes.join(' '),
+                redirect_uri: "http://localhost:3333/callback",
+                code_challenge_method: 'S256',
+                code_challenge: codechallenge
+            });
+            // Open the authentication page
+            opn('https://accounts.spotify.com/authorize?' + args);
+            // Create an express app
+            let app = express()
+            // Catch the response
+            app.get('/callback', async (req, res) => {
+                if(req.query.code != undefined) {
+                    const params = new URLSearchParams();
+                    params.append("client_id", this.clientId);
+                    params.append("grant_type", "authorization_code");
+                    params.append("code", req.query.code);
+                    params.append("redirect_uri", "http://localhost:3333/callback");
+                    params.append("code_verifier", codeVerifier);
+                    executePostRequest(configuration.SpotifyEndpoints.GET_USER_TOKEN_ENDPOINT, params, { headers: { "Content-Type": "application/x-www-form-urlencoded" } }, "json").then(result => {
+                        console.log(result)
+                    }, error => {
+                        console.log(error)
+                    })
+                } else {
+                    res.send("Spotify authentication failed! Please close this tab and try again.")
+                    reject("Error when executing request: no code provided.")
+                }
+            });
+            app.use(function(req, res, next) {
+                res.status(404)
+                res.send('404: File Not Found')
+            });
+    
+            app.listen(3333, function () {
+                console.log('Callback server is running!')
+            });
+            resolve()
+        }, error => {
+            reject(error)
+        })
+    }
+
+    // This function aims to refresh the user token 
+    async refreshUserToken() {
+        return new Promise((resolve, reject) => {
+            resolve()
+        })
+    }
+}
+
+// Execute a GET request to the Spotify API
+function executeGetRequest(url, requestObject, options, responseType){
+    return new Promise((resolve, reject) => {
+        axios.get(url, requestObject.serializeBinary(), options)
+        .then(function(response){
+            if (response.statusText !== 'OK') {
+                reject(`Request error (${response.status}): ${response.statusText}`)
+            } else {
+                resolve(responseType.deserializeBinary(response.data).toObject());
+            }
+        })
+        .catch(function(error){
+            reject(error)
+        })
+    })
+}
+
+// Execute a POST request to the Spotify API
+function executePostRequest(url, requestObject, options, responseType){
+    return new Promise((resolve, reject) => {
+        axios.post(url, requestObject, options)
+        .then(function(response){
+            if (response.statusText !== 'OK') {
+                reject(`Request error (${response.status}): ${response.statusText}`)
+            } else {
+                resolve(response.data);
+            }
+        })
+        .catch(function(error){
+            reject(error)
+        })
+    })
+}
+
+module.exports = SpotifyController;