Restructured Examples and added new one

* Added new ASP.NET Core 3 example
  This should show how this API can be implemented on the backend. It's not complete yet, features like token reloading is still missing.
  If you want to run this, use `dotnet user-secrets init` to generate your secrets file and update it with `spotify_client_id` and `spotify_secret_id`

* Fixed CLI Example
  The last page was never processed.

SpotifyAPI.Web.Example/SpotifyAPI.Web.Example.csproj

@@ -1,14 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.0</TargetFramework>
-    <LangVersion>latest</LangVersion>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <ProjectReference Include="..\SpotifyAPI.Web.Auth\SpotifyAPI.Web.Auth.csproj" />
-    <ProjectReference Include="..\SpotifyAPI.Web\SpotifyAPI.Web.csproj" />
-  </ItemGroup>
-
-</Project>

SpotifyAPI.Web.Example/SpotifyAPI.Web.Example.csproj.DotSettings

@@ -1,2 +0,0 @@
-<wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
-	<s:String x:Key="/Default/CodeInspection/CSharpLanguageProject/LanguageLevel/@EntryValue">CSharp71</s:String></wpf:ResourceDictionary>

SpotifyAPI.Web.Examples.ASP/ClaimsExtensions.cs

@@ -0,0 +1,15 @@
+using System.Linq;
+using System.Security.Claims;
+
+namespace SpotifyAPI.Web.Examples.ASP
+{
+    public static class ClaimsExtensions
+    {
+        public static string GetSpecificClaim(this ClaimsIdentity claimsIdentity, string claimType)
+        {
+            Claim claim = claimsIdentity.Claims.FirstOrDefault(x => x.Type == claimType);
+
+            return claim != null ? claim.Value : string.Empty;
+        }
+    }
+}

SpotifyAPI.Web.Examples.ASP/Controllers/AuthController.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Globalization;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Mvc;
+using SpotifyAPI.Web.Auth;
+using SpotifyAPI.Web.Enums;
+using SpotifyAPI.Web.Examples.ASP.Models;
+using SpotifyAPI.Web.Models;
+using Microsoft.Extensions.Configuration;
+
+namespace SpotifyAPI.Web.Examples.ASP.Controllers
+{
+    public class Auth : Controller
+    {
+        public IConfiguration Configuration { get; set; }
+
+        public Auth(IConfiguration config)
+        {
+            Configuration = config;
+        }
+        
+        private static Dictionary<string, AuthorizationCodeAuth> LoginRequests { get; } = new Dictionary<string, AuthorizationCodeAuth>();
+        
+        // GET
+        public IActionResult Login()
+        {
+            string guid = Guid.NewGuid().ToString();
+            var auth = new AuthorizationCodeAuth( // TODO: Extract to own method
+                Configuration["spotify_client_id"], Configuration["spotify_client_secret"],
+                "http://localhost:5000/auth/callback", "", Scope.PlaylistReadPrivate | Scope.PlaylistReadPrivate, guid);
+            
+            LoginRequests.Add(guid, auth); // TODO: Clean up after a timeout, else: DOS possible
+
+            return Redirect(auth.GetUri());
+        }
+        
+        [HttpPost]
+        public async Task<IActionResult> Logout()
+        {
+            await HttpContext.SignOutAsync();
+            
+            return RedirectToAction("Index", "Home");
+        }
+        
+        public async Task<IActionResult> Callback([FromQuery(Name = "code")] string code, [FromQuery(Name = "state")] string state,
+            [FromQuery(Name = "error")] string error)
+        {
+            if (error != null)
+                return View("Error", new ErrorViewModel { Message = error, RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier});
+            
+            if(!LoginRequests.ContainsKey(state))
+                return View("Error", new ErrorViewModel { Message = "Unknown login request", RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier});
+
+            AuthorizationCodeAuth auth = LoginRequests[state];
+            Token token = await auth.ExchangeCode(code);
+
+            if (token.HasError())
+            {
+                return View("Error",
+                    new ErrorViewModel
+                    {
+                        Message = $"Unable to exchange Code: ${token.Error}",
+                        RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier
+                    });
+            }
+            
+            var api = new SpotifyWebAPI
+            {
+                AccessToken = token.AccessToken,
+                TokenType = token.TokenType
+            };
+            PrivateProfile profile = await api.GetPrivateProfileAsync();
+            
+            var claims = new List<Claim>
+            {
+                // TODO: Extract claim types to either Enum or class
+                new Claim("user_id", profile.Id),
+                new Claim("display_name", profile.DisplayName ?? profile.Id),
+                new Claim("access_token", token.AccessToken),
+                new Claim("token_type", token.TokenType),
+                new Claim("refresh_token", token.RefreshToken),
+                new Claim("expires_in", token.ExpiresIn.ToString(CultureInfo.InvariantCulture))
+            };
+            await HttpContext.SignInAsync(new ClaimsPrincipal(new ClaimsIdentity(claims, "Cookies", "user_id", "")));
+
+            return Redirect("/");
+        }
+    }
+}

SpotifyAPI.Web.Examples.ASP/Controllers/HomeController.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Security.Claims;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SpotifyAPI.Web.Auth;
+using SpotifyAPI.Web.Enums;
+using SpotifyAPI.Web.Examples.ASP.Models;
+
+namespace SpotifyAPI.Web.Examples.ASP.Controllers
+{
+    [Authorize]
+    public class HomeController : Controller
+    {
+        public async Task<ViewResult> Index()
+        {
+            var claimsIdent = User.Identity as ClaimsIdentity;
+
+            SpotifyWebAPI api = GetSpotifyApiFromUser(claimsIdent);
+            if (api == null)
+                return View(new HomeModel());
+            
+            string userId = claimsIdent.GetSpecificClaim("user_id");
+            var playlists = await api.GetUserPlaylistsAsync(userId);
+            return View(new HomeModel
+            {
+                Playlists = playlists
+            });
+        }
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel {RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier});
+        }
+
+        private static SpotifyWebAPI GetSpotifyApiFromUser(ClaimsIdentity claimsIdent)
+        {
+            // TODO: Add expires_in logic
+
+            string accessToken = claimsIdent.GetSpecificClaim("access_token");
+            string tokenType = claimsIdent.GetSpecificClaim("token_type");
+            return new SpotifyWebAPI
+            {
+                AccessToken = accessToken,
+                TokenType = tokenType
+            };
+        }
+    }
+}

SpotifyAPI.Web.Examples.ASP/Models/ErrorViewModel.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace SpotifyAPI.Web.Examples.ASP.Models
+{
+    public class ErrorViewModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+        
+        public string Message { get; set; }
+    }
+}

SpotifyAPI.Web.Examples.ASP/Models/HomeModel.cs

@@ -0,0 +1,9 @@
+using SpotifyAPI.Web.Models;
+
+namespace SpotifyAPI.Web.Examples.ASP.Models
+{
+    public class HomeModel
+    {
+        public Paging<SimplePlaylist> Playlists;
+    }
+}

SpotifyAPI.Web.Examples.ASP/Program.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Logging;
+
+namespace SpotifyAPI.Web.Examples.ASP
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateWebHostBuilder(args).Build().Run();
+        }
+
+        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>();
+    }
+}

SpotifyAPI.Web.Examples.ASP/Properties/launchSettings.json

@@ -0,0 +1,27 @@
+{
+  "iisSettings": {
+    "windowsAuthentication": false, 
+    "anonymousAuthentication": true, 
+    "iisExpress": {
+      "applicationUrl": "http://localhost:7731",
+      "sslPort": 44310
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "SpotifyAPI.Web.Examples.ASP": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

SpotifyAPI.Web.Examples.ASP/SpotifyAPI.Web.Examples.ASP.csproj

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
+    <UserSecretsId>52b27bb1-dc8f-4151-8ad6-b6efdb8edbb7</UserSecretsId>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\SpotifyAPI.Web.Auth\SpotifyAPI.Web.Auth.csproj" />
+  </ItemGroup>
+</Project>

SpotifyAPI.Web.Examples.ASP/Startup.cs

@@ -0,0 +1,81 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using EnvironmentName = Microsoft.AspNetCore.Hosting.EnvironmentName;
+
+namespace SpotifyAPI.Web.Examples.ASP
+{
+    public class Startup
+    {
+        private const string CookieScheme = "YourSchemeName";
+        
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.Configure<CookiePolicyOptions>(options =>
+            {
+                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
+                options.CheckConsentNeeded = context => true;
+                options.MinimumSameSitePolicy = SameSiteMode.None;
+            });
+            
+            services
+                .AddAuthentication(CookieScheme) // Sets the default scheme to cookies
+                .AddCookie(CookieScheme, options =>
+                {
+                    options.LoginPath = "/auth/login";
+                });
+
+
+
+            services
+                .AddMvc(options => options.EnableEndpointRouting = false)
+                .SetCompatibilityVersion(CompatibilityVersion.Version_3_0);
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseHttpsRedirection();
+                app.UseExceptionHandler("/Home/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                app.UseHsts();
+                app.UseHttpsRedirection();
+            }
+
+            
+            app.UseStaticFiles();
+            app.UseCookiePolicy();
+
+            app.UseAuthentication();
+            app.UseMvc(routes =>
+            {
+                routes.MapRoute(
+                    name: "default",
+                    template: "{controller=Home}/{action=Index}/{id?}");
+            });
+        }
+    }
+}

SpotifyAPI.Web.Examples.ASP/Views/Home/Index.cshtml

@@ -0,0 +1,39 @@
+ @model HomeModel
+ @using System.Security.Claims 
+ @using Microsoft.AspNetCore.Authentication
+ @{
+    ViewData["Title"] = "Home Page";
+ }
+ 
+  <h2>Some Playlists (first 20)</h2>
+ 
+  @if (Model.Playlists != null && !Model.Playlists.HasError())
+ {
+     <dl>
+         @foreach (var playlist in Model.Playlists.Items)
+         {
+             <dt>@playlist.Name</dt>
+             <dd>@(playlist.Owner.DisplayName ?? playlist.Owner.Id)</dd>
+         }
+     </dl>
+ }
+
+ <h2>HttpContext.User.Claims</h2>
+
+<dl>
+    @foreach (Claim claim in User.Claims)
+    {
+        <dt>@claim.Type</dt>
+        <dd>@claim.Value</dd>
+    }
+</dl>
+
+<h2>AuthenticationProperties</h2>
+
+ <dl>
+     @foreach (var prop in (await Context.AuthenticateAsync()).Properties.Items)
+     {
+         <dt>@prop.Key</dt>
+         <dd>@prop.Value</dd>
+     }
+ </dl>

SpotifyAPI.Web.Examples.ASP/Views/Shared/Error.cshtml

@@ -0,0 +1,26 @@
+@model ErrorViewModel
+@{
+    ViewData["Title"] = "Error";
+}
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (Model.ShowRequestId)
+{
+    <p>
+        <strong>Message:</strong> <code>@Model.Message</code>
+        <strong>Request ID:</strong> <code>@Model.RequestId</code>
+    </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+    Swapping to <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+    It can result in displaying sensitive information from exceptions to end users.
+    For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+    and restarting the app.
+</p>

SpotifyAPI.Web.Examples.ASP/Views/Shared/_Layout.cshtml

@@ -0,0 +1,78 @@
+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>@ViewData["Title"] - SpotifyAPI.Web.Examples.ASP</title>
+
+    <environment include="Development">
+        <link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.css" />
+    </environment>
+    <environment exclude="Development">
+        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
+              asp-fallback-href="~/lib/bootstrap/dist/css/bootstrap.min.css"
+              asp-fallback-test-class="sr-only" asp-fallback-test-property="position" asp-fallback-test-value="absolute"
+              crossorigin="anonymous"
+              integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T"/>
+    </environment>
+    <link rel="stylesheet" href="~/css/site.css" />
+</head>
+<body>
+    <header>
+        <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
+            <div class="container">
+                <a class="navbar-brand" asp-area="" asp-controller="Home" asp-action="Index">SpotifyAPI.Web.Examples.ASP</a>
+                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".navbar-collapse" aria-controls="navbarSupportedContent"
+                        aria-expanded="false" aria-label="Toggle navigation">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
+                <div class="navbar-collapse collapse d-sm-inline-flex flex-sm-row-reverse">
+                    <ul class="navbar-nav flex-grow-1">
+                        <li class="nav-item">
+                            <a class="nav-link text-dark" asp-area="" asp-controller="Home" asp-action="Index">Home</a>
+                        </li>
+                        @if (User.Identity.IsAuthenticated)
+                        {
+                            <li>
+                                <form class="form-inline" asp-controller="Auth" asp-action="Logout" method="post" >
+                                    <button type="submit" class="nav-link btn btn-link">Logout</button>
+                                </form>
+                            </li>
+                        }
+                    </ul>
+                </div>
+            </div>
+        </nav>
+    </header>
+    <div class="container">
+        <main role="main" class="pb-3">
+            @RenderBody()
+        </main>
+    </div>
+
+    <footer class="border-top footer text-muted">
+    </footer>
+
+    <environment include="Development">
+        <script src="~/lib/jquery/dist/jquery.js"></script>
+        <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.js"></script>
+    </environment>
+    <environment exclude="Development">
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"
+                asp-fallback-src="~/lib/jquery/dist/jquery.min.js"
+                asp-fallback-test="window.jQuery"
+                crossorigin="anonymous"
+                integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=">
+        </script>
+        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js"
+                asp-fallback-src="~/lib/bootstrap/dist/js/bootstrap.bundle.min.js"
+                asp-fallback-test="window.jQuery && window.jQuery.fn && window.jQuery.fn.modal"
+                crossorigin="anonymous"
+                integrity="sha384-xrRywqdh3PHs8keKZN+8zzc5TX0GRTLCcmivcbNJWm2rs5C8PRhcEn3czEjhAO9o">
+        </script>
+    </environment>
+    <script src="~/js/site.js" asp-append-version="true"></script>
+
+    @RenderSection("Scripts", required: false)
+</body>
+</html>

SpotifyAPI.Web.Examples.ASP/Views/Shared/_ValidationScriptsPartial.cshtml

@@ -0,0 +1,18 @@
+<environment include="Development">
+    <script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
+    <script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>
+</environment>
+<environment exclude="Development">
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.min.js"
+            asp-fallback-src="~/lib/jquery-validation/dist/jquery.validate.min.js"
+            asp-fallback-test="window.jQuery && window.jQuery.validator"
+            crossorigin="anonymous"
+            integrity="sha256-F6h55Qw6sweK+t7SiOJX+2bpSAa3b/fnlrVCJvmEj1A=">
+    </script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validation-unobtrusive/3.2.11/jquery.validate.unobtrusive.min.js"
+            asp-fallback-src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"
+            asp-fallback-test="window.jQuery && window.jQuery.validator && window.jQuery.validator.unobtrusive"
+            crossorigin="anonymous"
+            integrity="sha256-9GycpJnliUjJDVDqP0UEu/bsm9U+3dnQUH8+3W10vkY=">
+    </script>
+</environment>

SpotifyAPI.Web.Examples.ASP/Views/_ViewImports.cshtml

@@ -0,0 +1,3 @@
+@using SpotifyAPI.Web.Examples.ASP
+@using SpotifyAPI.Web.Examples.ASP.Models
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

SpotifyAPI.Web.Examples.ASP/Views/_ViewStart.cshtml

@@ -0,0 +1,3 @@
+@{
+    Layout = "_Layout";
+}

SpotifyAPI.Web.Examples.ASP/appsettings.Development.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

SpotifyAPI.Web.Examples.ASP/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

SpotifyAPI.Web.Examples.ASP/wwwroot/css/site.css

@@ -0,0 +1,56 @@
+/* Please see documentation at https://docs.microsoft.com/aspnet/core/client-side/bundling-and-minification
+for details on configuring this project to bundle and minify static web assets. */
+
+a.navbar-brand {
+  white-space: normal;
+  text-align: center;
+  word-break: break-all;
+}
+
+/* Sticky footer styles
+-------------------------------------------------- */
+html {
+  font-size: 14px;
+}
+@media (min-width: 768px) {
+  html {
+    font-size: 16px;
+  }
+}
+
+.border-top {
+  border-top: 1px solid #e5e5e5;
+}
+.border-bottom {
+  border-bottom: 1px solid #e5e5e5;
+}
+
+.box-shadow {
+  box-shadow: 0 .25rem .75rem rgba(0, 0, 0, .05);
+}
+
+button.accept-policy {
+  font-size: 1rem;
+  line-height: inherit;
+}
+
+/* Sticky footer styles
+-------------------------------------------------- */
+html {
+  position: relative;
+  min-height: 100%;
+}
+
+body {
+  /* Margin bottom by footer height */
+  margin-bottom: 60px;
+}
+.footer {
+  position: absolute;
+  bottom: 0;
+  width: 100%;
+  white-space: nowrap;
+  /* Set the fixed height of the footer here */
+  height: 60px;
+  line-height: 60px; /* Vertically center the text there */
+}

SpotifyAPI.Web.Examples.ASP/wwwroot/js/site.js

@@ -0,0 +1,4 @@
+// Please see documentation at https://docs.microsoft.com/aspnet/core/client-side/bundling-and-minification
+// for details on configuring this project to bundle and minify static web assets.
+
+// Write your JavaScript code.

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/bootstrap/LICENSE

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+
+Copyright (c) 2011-2018 Twitter, Inc.
+Copyright (c) 2011-2018 The Bootstrap Authors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.css

@@ -0,0 +1,331 @@
+/*!
+ * Bootstrap Reboot v4.3.1 (https://getbootstrap.com/)
+ * Copyright 2011-2019 The Bootstrap Authors
+ * Copyright 2011-2019 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
+ */
+*,
+*::before,
+*::after {
+  box-sizing: border-box;
+}
+
+html {
+  font-family: sans-serif;
+  line-height: 1.15;
+  -webkit-text-size-adjust: 100%;
+  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
+}
+
+article, aside, figcaption, figure, footer, header, hgroup, main, nav, section {
+  display: block;
+}
+
+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
+  font-size: 1rem;
+  font-weight: 400;
+  line-height: 1.5;
+  color: #212529;
+  text-align: left;
+  background-color: #fff;
+}
+
+[tabindex="-1"]:focus {
+  outline: 0 !important;
+}
+
+hr {
+  box-sizing: content-box;
+  height: 0;
+  overflow: visible;
+}
+
+h1, h2, h3, h4, h5, h6 {
+  margin-top: 0;
+  margin-bottom: 0.5rem;
+}
+
+p {
+  margin-top: 0;
+  margin-bottom: 1rem;
+}
+
+abbr[title],
+abbr[data-original-title] {
+  text-decoration: underline;
+  -webkit-text-decoration: underline dotted;
+  text-decoration: underline dotted;
+  cursor: help;
+  border-bottom: 0;
+  -webkit-text-decoration-skip-ink: none;
+  text-decoration-skip-ink: none;
+}
+
+address {
+  margin-bottom: 1rem;
+  font-style: normal;
+  line-height: inherit;
+}
+
+ol,
+ul,
+dl {
+  margin-top: 0;
+  margin-bottom: 1rem;
+}
+
+ol ol,
+ul ul,
+ol ul,
+ul ol {
+  margin-bottom: 0;
+}
+
+dt {
+  font-weight: 700;
+}
+
+dd {
+  margin-bottom: .5rem;
+  margin-left: 0;
+}
+
+blockquote {
+  margin: 0 0 1rem;
+}
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+small {
+  font-size: 80%;
+}
+
+sub,
+sup {
+  position: relative;
+  font-size: 75%;
+  line-height: 0;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -.25em;
+}
+
+sup {
+  top: -.5em;
+}
+
+a {
+  color: #007bff;
+  text-decoration: none;
+  background-color: transparent;
+}
+
+a:hover {
+  color: #0056b3;
+  text-decoration: underline;
+}
+
+a:not([href]):not([tabindex]) {
+  color: inherit;
+  text-decoration: none;
+}
+
+a:not([href]):not([tabindex]):hover, a:not([href]):not([tabindex]):focus {
+  color: inherit;
+  text-decoration: none;
+}
+
+a:not([href]):not([tabindex]):focus {
+  outline: 0;
+}
+
+pre,
+code,
+kbd,
+samp {
+  font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
+  font-size: 1em;
+}
+
+pre {
+  margin-top: 0;
+  margin-bottom: 1rem;
+  overflow: auto;
+}
+
+figure {
+  margin: 0 0 1rem;
+}
+
+img {
+  vertical-align: middle;
+  border-style: none;
+}
+
+svg {
+  overflow: hidden;
+  vertical-align: middle;
+}
+
+table {
+  border-collapse: collapse;
+}
+
+caption {
+  padding-top: 0.75rem;
+  padding-bottom: 0.75rem;
+  color: #6c757d;
+  text-align: left;
+  caption-side: bottom;
+}
+
+th {
+  text-align: inherit;
+}
+
+label {
+  display: inline-block;
+  margin-bottom: 0.5rem;
+}
+
+button {
+  border-radius: 0;
+}
+
+button:focus {
+  outline: 1px dotted;
+  outline: 5px auto -webkit-focus-ring-color;
+}
+
+input,
+button,
+select,
+optgroup,
+textarea {
+  margin: 0;
+  font-family: inherit;
+  font-size: inherit;
+  line-height: inherit;
+}
+
+button,
+input {
+  overflow: visible;
+}
+
+button,
+select {
+  text-transform: none;
+}
+
+select {
+  word-wrap: normal;
+}
+
+button,
+[type="button"],
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button;
+}
+
+button:not(:disabled),
+[type="button"]:not(:disabled),
+[type="reset"]:not(:disabled),
+[type="submit"]:not(:disabled) {
+  cursor: pointer;
+}
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  padding: 0;
+  border-style: none;
+}
+
+input[type="radio"],
+input[type="checkbox"] {
+  box-sizing: border-box;
+  padding: 0;
+}
+
+input[type="date"],
+input[type="time"],
+input[type="datetime-local"],
+input[type="month"] {
+  -webkit-appearance: listbox;
+}
+
+textarea {
+  overflow: auto;
+  resize: vertical;
+}
+
+fieldset {
+  min-width: 0;
+  padding: 0;
+  margin: 0;
+  border: 0;
+}
+
+legend {
+  display: block;
+  width: 100%;
+  max-width: 100%;
+  padding: 0;
+  margin-bottom: .5rem;
+  font-size: 1.5rem;
+  line-height: inherit;
+  color: inherit;
+  white-space: normal;
+}
+
+progress {
+  vertical-align: baseline;
+}
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+[type="search"] {
+  outline-offset: -2px;
+  -webkit-appearance: none;
+}
+
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+::-webkit-file-upload-button {
+  font: inherit;
+  -webkit-appearance: button;
+}
+
+output {
+  display: inline-block;
+}
+
+summary {
+  display: list-item;
+  cursor: pointer;
+}
+
+template {
+  display: none;
+}
+
+[hidden] {
+  display: none !important;
+}
+/*# sourceMappingURL=bootstrap-reboot.css.map */

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/bootstrap/dist/css/bootstrap-reboot.min.css

@@ -0,0 +1,8 @@
+/*!
+ * Bootstrap Reboot v4.3.1 (https://getbootstrap.com/)
+ * Copyright 2011-2019 The Bootstrap Authors
+ * Copyright 2011-2019 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
+ */*,::after,::before{box-sizing:border-box}html{font-family:sans-serif;line-height:1.15;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:transparent}article,aside,figcaption,figure,footer,header,hgroup,main,nav,section{display:block}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji";font-size:1rem;font-weight:400;line-height:1.5;color:#212529;text-align:left;background-color:#fff}[tabindex="-1"]:focus{outline:0!important}hr{box-sizing:content-box;height:0;overflow:visible}h1,h2,h3,h4,h5,h6{margin-top:0;margin-bottom:.5rem}p{margin-top:0;margin-bottom:1rem}abbr[data-original-title],abbr[title]{text-decoration:underline;-webkit-text-decoration:underline dotted;text-decoration:underline dotted;cursor:help;border-bottom:0;-webkit-text-decoration-skip-ink:none;text-decoration-skip-ink:none}address{margin-bottom:1rem;font-style:normal;line-height:inherit}dl,ol,ul{margin-top:0;margin-bottom:1rem}ol ol,ol ul,ul ol,ul ul{margin-bottom:0}dt{font-weight:700}dd{margin-bottom:.5rem;margin-left:0}blockquote{margin:0 0 1rem}b,strong{font-weight:bolder}small{font-size:80%}sub,sup{position:relative;font-size:75%;line-height:0;vertical-align:baseline}sub{bottom:-.25em}sup{top:-.5em}a{color:#007bff;text-decoration:none;background-color:transparent}a:hover{color:#0056b3;text-decoration:underline}a:not([href]):not([tabindex]){color:inherit;text-decoration:none}a:not([href]):not([tabindex]):focus,a:not([href]):not([tabindex]):hover{color:inherit;text-decoration:none}a:not([href]):not([tabindex]):focus{outline:0}code,kbd,pre,samp{font-family:SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:1em}pre{margin-top:0;margin-bottom:1rem;overflow:auto}figure{margin:0 0 1rem}img{vertical-align:middle;border-style:none}svg{overflow:hidden;vertical-align:middle}table{border-collapse:collapse}caption{padding-top:.75rem;padding-bottom:.75rem;color:#6c757d;text-align:left;caption-side:bottom}th{text-align:inherit}label{display:inline-block;margin-bottom:.5rem}button{border-radius:0}button:focus{outline:1px dotted;outline:5px auto -webkit-focus-ring-color}button,input,optgroup,select,textarea{margin:0;font-family:inherit;font-size:inherit;line-height:inherit}button,input{overflow:visible}button,select{text-transform:none}select{word-wrap:normal}[type=button],[type=reset],[type=submit],button{-webkit-appearance:button}[type=button]:not(:disabled),[type=reset]:not(:disabled),[type=submit]:not(:disabled),button:not(:disabled){cursor:pointer}[type=button]::-moz-focus-inner,[type=reset]::-moz-focus-inner,[type=submit]::-moz-focus-inner,button::-moz-focus-inner{padding:0;border-style:none}input[type=checkbox],input[type=radio]{box-sizing:border-box;padding:0}input[type=date],input[type=datetime-local],input[type=month],input[type=time]{-webkit-appearance:listbox}textarea{overflow:auto;resize:vertical}fieldset{min-width:0;padding:0;margin:0;border:0}legend{display:block;width:100%;max-width:100%;padding:0;margin-bottom:.5rem;font-size:1.5rem;line-height:inherit;color:inherit;white-space:normal}progress{vertical-align:baseline}[type=number]::-webkit-inner-spin-button,[type=number]::-webkit-outer-spin-button{height:auto}[type=search]{outline-offset:-2px;-webkit-appearance:none}[type=search]::-webkit-search-decoration{-webkit-appearance:none}::-webkit-file-upload-button{font:inherit;-webkit-appearance:button}output{display:inline-block}summary{display:list-item;cursor:pointer}template{display:none}[hidden]{display:none!important}
+/*# sourceMappingURL=bootstrap-reboot.min.css.map */

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/jquery-validation-unobtrusive/LICENSE.txt

@@ -0,0 +1,12 @@
+Copyright (c) .NET Foundation. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License"); you may not use
+these files except in compliance with the License. You may obtain a copy of the
+License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed
+under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. See the License for the
+specific language governing permissions and limitations under the License.

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js

@@ -0,0 +1,432 @@
+// Unobtrusive validation support library for jQuery and jQuery Validate
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+// @version v3.2.11
+
+/*jslint white: true, browser: true, onevar: true, undef: true, nomen: true, eqeqeq: true, plusplus: true, bitwise: true, regexp: true, newcap: true, immed: true, strict: false */
+/*global document: false, jQuery: false */
+
+(function (factory) {
+    if (typeof define === 'function' && define.amd) {
+        // AMD. Register as an anonymous module.
+        define("jquery.validate.unobtrusive", ['jquery-validation'], factory);
+    } else if (typeof module === 'object' && module.exports) {
+        // CommonJS-like environments that support module.exports     
+        module.exports = factory(require('jquery-validation'));
+    } else {
+        // Browser global
+        jQuery.validator.unobtrusive = factory(jQuery);
+    }
+}(function ($) {
+    var $jQval = $.validator,
+        adapters,
+        data_validation = "unobtrusiveValidation";
+
+    function setValidationValues(options, ruleName, value) {
+        options.rules[ruleName] = value;
+        if (options.message) {
+            options.messages[ruleName] = options.message;
+        }
+    }
+
+    function splitAndTrim(value) {
+        return value.replace(/^\s+|\s+$/g, "").split(/\s*,\s*/g);
+    }
+
+    function escapeAttributeValue(value) {
+        // As mentioned on http://api.jquery.com/category/selectors/
+        return value.replace(/([!"#$%&'()*+,./:;<=>?@\[\\\]^`{|}~])/g, "\\$1");
+    }
+
+    function getModelPrefix(fieldName) {
+        return fieldName.substr(0, fieldName.lastIndexOf(".") + 1);
+    }
+
+    function appendModelPrefix(value, prefix) {
+        if (value.indexOf("*.") === 0) {
+            value = value.replace("*.", prefix);
+        }
+        return value;
+    }
+
+    function onError(error, inputElement) {  // 'this' is the form element
+        var container = $(this).find("[data-valmsg-for='" + escapeAttributeValue(inputElement[0].name) + "']"),
+            replaceAttrValue = container.attr("data-valmsg-replace"),
+            replace = replaceAttrValue ? $.parseJSON(replaceAttrValue) !== false : null;
+
+        container.removeClass("field-validation-valid").addClass("field-validation-error");
+        error.data("unobtrusiveContainer", container);
+
+        if (replace) {
+            container.empty();
+            error.removeClass("input-validation-error").appendTo(container);
+        }
+        else {
+            error.hide();
+        }
+    }
+
+    function onErrors(event, validator) {  // 'this' is the form element
+        var container = $(this).find("[data-valmsg-summary=true]"),
+            list = container.find("ul");
+
+        if (list && list.length && validator.errorList.length) {
+            list.empty();
+            container.addClass("validation-summary-errors").removeClass("validation-summary-valid");
+
+            $.each(validator.errorList, function () {
+                $("<li />").html(this.message).appendTo(list);
+            });
+        }
+    }
+
+    function onSuccess(error) {  // 'this' is the form element
+        var container = error.data("unobtrusiveContainer");
+
+        if (container) {
+            var replaceAttrValue = container.attr("data-valmsg-replace"),
+                replace = replaceAttrValue ? $.parseJSON(replaceAttrValue) : null;
+
+            container.addClass("field-validation-valid").removeClass("field-validation-error");
+            error.removeData("unobtrusiveContainer");
+
+            if (replace) {
+                container.empty();
+            }
+        }
+    }
+
+    function onReset(event) {  // 'this' is the form element
+        var $form = $(this),
+            key = '__jquery_unobtrusive_validation_form_reset';
+        if ($form.data(key)) {
+            return;
+        }
+        // Set a flag that indicates we're currently resetting the form.
+        $form.data(key, true);
+        try {
+            $form.data("validator").resetForm();
+        } finally {
+            $form.removeData(key);
+        }
+
+        $form.find(".validation-summary-errors")
+            .addClass("validation-summary-valid")
+            .removeClass("validation-summary-errors");
+        $form.find(".field-validation-error")
+            .addClass("field-validation-valid")
+            .removeClass("field-validation-error")
+            .removeData("unobtrusiveContainer")
+            .find(">*")  // If we were using valmsg-replace, get the underlying error
+            .removeData("unobtrusiveContainer");
+    }
+
+    function validationInfo(form) {
+        var $form = $(form),
+            result = $form.data(data_validation),
+            onResetProxy = $.proxy(onReset, form),
+            defaultOptions = $jQval.unobtrusive.options || {},
+            execInContext = function (name, args) {
+                var func = defaultOptions[name];
+                func && $.isFunction(func) && func.apply(form, args);
+            };
+
+        if (!result) {
+            result = {
+                options: {  // options structure passed to jQuery Validate's validate() method
+                    errorClass: defaultOptions.errorClass || "input-validation-error",
+                    errorElement: defaultOptions.errorElement || "span",
+                    errorPlacement: function () {
+                        onError.apply(form, arguments);
+                        execInContext("errorPlacement", arguments);
+                    },
+                    invalidHandler: function () {
+                        onErrors.apply(form, arguments);
+                        execInContext("invalidHandler", arguments);
+                    },
+                    messages: {},
+                    rules: {},
+                    success: function () {
+                        onSuccess.apply(form, arguments);
+                        execInContext("success", arguments);
+                    }
+                },
+                attachValidation: function () {
+                    $form
+                        .off("reset." + data_validation, onResetProxy)
+                        .on("reset." + data_validation, onResetProxy)
+                        .validate(this.options);
+                },
+                validate: function () {  // a validation function that is called by unobtrusive Ajax
+                    $form.validate();
+                    return $form.valid();
+                }
+            };
+            $form.data(data_validation, result);
+        }
+
+        return result;
+    }
+
+    $jQval.unobtrusive = {
+        adapters: [],
+
+        parseElement: function (element, skipAttach) {
+            /// <summary>
+            /// Parses a single HTML element for unobtrusive validation attributes.
+            /// </summary>
+            /// <param name="element" domElement="true">The HTML element to be parsed.</param>
+            /// <param name="skipAttach" type="Boolean">[Optional] true to skip attaching the
+            /// validation to the form. If parsing just this single element, you should specify true.
+            /// If parsing several elements, you should specify false, and manually attach the validation
+            /// to the form when you are finished. The default is false.</param>
+            var $element = $(element),
+                form = $element.parents("form")[0],
+                valInfo, rules, messages;
+
+            if (!form) {  // Cannot do client-side validation without a form
+                return;
+            }
+
+            valInfo = validationInfo(form);
+            valInfo.options.rules[element.name] = rules = {};
+            valInfo.options.messages[element.name] = messages = {};
+
+            $.each(this.adapters, function () {
+                var prefix = "data-val-" + this.name,
+                    message = $element.attr(prefix),
+                    paramValues = {};
+
+                if (message !== undefined) {  // Compare against undefined, because an empty message is legal (and falsy)
+                    prefix += "-";
+
+                    $.each(this.params, function () {
+                        paramValues[this] = $element.attr(prefix + this);
+                    });
+
+                    this.adapt({
+                        element: element,
+                        form: form,
+                        message: message,
+                        params: paramValues,
+                        rules: rules,
+                        messages: messages
+                    });
+                }
+            });
+
+            $.extend(rules, { "__dummy__": true });
+
+            if (!skipAttach) {
+                valInfo.attachValidation();
+            }
+        },
+
+        parse: function (selector) {
+            /// <summary>
+            /// Parses all the HTML elements in the specified selector. It looks for input elements decorated
+            /// with the [data-val=true] attribute value and enables validation according to the data-val-*
+            /// attribute values.
+            /// </summary>
+            /// <param name="selector" type="String">Any valid jQuery selector.</param>
+
+            // $forms includes all forms in selector's DOM hierarchy (parent, children and self) that have at least one
+            // element with data-val=true
+            var $selector = $(selector),
+                $forms = $selector.parents()
+                    .addBack()
+                    .filter("form")
+                    .add($selector.find("form"))
+                    .has("[data-val=true]");
+
+            $selector.find("[data-val=true]").each(function () {
+                $jQval.unobtrusive.parseElement(this, true);
+            });
+
+            $forms.each(function () {
+                var info = validationInfo(this);
+                if (info) {
+                    info.attachValidation();
+                }
+            });
+        }
+    };
+
+    adapters = $jQval.unobtrusive.adapters;
+
+    adapters.add = function (adapterName, params, fn) {
+        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation.</summary>
+        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
+        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
+        /// <param name="params" type="Array" optional="true">[Optional] An array of parameter names (strings) that will
+        /// be extracted from the data-val-nnnn-mmmm HTML attributes (where nnnn is the adapter name, and
+        /// mmmm is the parameter name).</param>
+        /// <param name="fn" type="Function">The function to call, which adapts the values from the HTML
+        /// attributes into jQuery Validate rules and/or messages.</param>
+        /// <returns type="jQuery.validator.unobtrusive.adapters" />
+        if (!fn) {  // Called with no params, just a function
+            fn = params;
+            params = [];
+        }
+        this.push({ name: adapterName, params: params, adapt: fn });
+        return this;
+    };
+
+    adapters.addBool = function (adapterName, ruleName) {
+        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
+        /// the jQuery Validate validation rule has no parameter values.</summary>
+        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
+        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
+        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
+        /// of adapterName will be used instead.</param>
+        /// <returns type="jQuery.validator.unobtrusive.adapters" />
+        return this.add(adapterName, function (options) {
+            setValidationValues(options, ruleName || adapterName, true);
+        });
+    };
+
+    adapters.addMinMax = function (adapterName, minRuleName, maxRuleName, minMaxRuleName, minAttribute, maxAttribute) {
+        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
+        /// the jQuery Validate validation has three potential rules (one for min-only, one for max-only, and
+        /// one for min-and-max). The HTML parameters are expected to be named -min and -max.</summary>
+        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
+        /// in the data-val-nnnn HTML attribute (where nnnn is the adapter name).</param>
+        /// <param name="minRuleName" type="String">The name of the jQuery Validate rule to be used when you only
+        /// have a minimum value.</param>
+        /// <param name="maxRuleName" type="String">The name of the jQuery Validate rule to be used when you only
+        /// have a maximum value.</param>
+        /// <param name="minMaxRuleName" type="String">The name of the jQuery Validate rule to be used when you
+        /// have both a minimum and maximum value.</param>
+        /// <param name="minAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
+        /// contains the minimum value. The default is "min".</param>
+        /// <param name="maxAttribute" type="String" optional="true">[Optional] The name of the HTML attribute that
+        /// contains the maximum value. The default is "max".</param>
+        /// <returns type="jQuery.validator.unobtrusive.adapters" />
+        return this.add(adapterName, [minAttribute || "min", maxAttribute || "max"], function (options) {
+            var min = options.params.min,
+                max = options.params.max;
+
+            if (min && max) {
+                setValidationValues(options, minMaxRuleName, [min, max]);
+            }
+            else if (min) {
+                setValidationValues(options, minRuleName, min);
+            }
+            else if (max) {
+                setValidationValues(options, maxRuleName, max);
+            }
+        });
+    };
+
+    adapters.addSingleVal = function (adapterName, attribute, ruleName) {
+        /// <summary>Adds a new adapter to convert unobtrusive HTML into a jQuery Validate validation, where
+        /// the jQuery Validate validation rule has a single value.</summary>
+        /// <param name="adapterName" type="String">The name of the adapter to be added. This matches the name used
+        /// in the data-val-nnnn HTML attribute(where nnnn is the adapter name).</param>
+        /// <param name="attribute" type="String">[Optional] The name of the HTML attribute that contains the value.
+        /// The default is "val".</param>
+        /// <param name="ruleName" type="String" optional="true">[Optional] The name of the jQuery Validate rule. If not provided, the value
+        /// of adapterName will be used instead.</param>
+        /// <returns type="jQuery.validator.unobtrusive.adapters" />
+        return this.add(adapterName, [attribute || "val"], function (options) {
+            setValidationValues(options, ruleName || adapterName, options.params[attribute]);
+        });
+    };
+
+    $jQval.addMethod("__dummy__", function (value, element, params) {
+        return true;
+    });
+
+    $jQval.addMethod("regex", function (value, element, params) {
+        var match;
+        if (this.optional(element)) {
+            return true;
+        }
+
+        match = new RegExp(params).exec(value);
+        return (match && (match.index === 0) && (match[0].length === value.length));
+    });
+
+    $jQval.addMethod("nonalphamin", function (value, element, nonalphamin) {
+        var match;
+        if (nonalphamin) {
+            match = value.match(/\W/g);
+            match = match && match.length >= nonalphamin;
+        }
+        return match;
+    });
+
+    if ($jQval.methods.extension) {
+        adapters.addSingleVal("accept", "mimtype");
+        adapters.addSingleVal("extension", "extension");
+    } else {
+        // for backward compatibility, when the 'extension' validation method does not exist, such as with versions
+        // of JQuery Validation plugin prior to 1.10, we should use the 'accept' method for
+        // validating the extension, and ignore mime-type validations as they are not supported.
+        adapters.addSingleVal("extension", "extension", "accept");
+    }
+
+    adapters.addSingleVal("regex", "pattern");
+    adapters.addBool("creditcard").addBool("date").addBool("digits").addBool("email").addBool("number").addBool("url");
+    adapters.addMinMax("length", "minlength", "maxlength", "rangelength").addMinMax("range", "min", "max", "range");
+    adapters.addMinMax("minlength", "minlength").addMinMax("maxlength", "minlength", "maxlength");
+    adapters.add("equalto", ["other"], function (options) {
+        var prefix = getModelPrefix(options.element.name),
+            other = options.params.other,
+            fullOtherName = appendModelPrefix(other, prefix),
+            element = $(options.form).find(":input").filter("[name='" + escapeAttributeValue(fullOtherName) + "']")[0];
+
+        setValidationValues(options, "equalTo", element);
+    });
+    adapters.add("required", function (options) {
+        // jQuery Validate equates "required" with "mandatory" for checkbox elements
+        if (options.element.tagName.toUpperCase() !== "INPUT" || options.element.type.toUpperCase() !== "CHECKBOX") {
+            setValidationValues(options, "required", true);
+        }
+    });
+    adapters.add("remote", ["url", "type", "additionalfields"], function (options) {
+        var value = {
+            url: options.params.url,
+            type: options.params.type || "GET",
+            data: {}
+        },
+            prefix = getModelPrefix(options.element.name);
+
+        $.each(splitAndTrim(options.params.additionalfields || options.element.name), function (i, fieldName) {
+            var paramName = appendModelPrefix(fieldName, prefix);
+            value.data[paramName] = function () {
+                var field = $(options.form).find(":input").filter("[name='" + escapeAttributeValue(paramName) + "']");
+                // For checkboxes and radio buttons, only pick up values from checked fields.
+                if (field.is(":checkbox")) {
+                    return field.filter(":checked").val() || field.filter(":hidden").val() || '';
+                }
+                else if (field.is(":radio")) {
+                    return field.filter(":checked").val() || '';
+                }
+                return field.val();
+            };
+        });
+
+        setValidationValues(options, "remote", value);
+    });
+    adapters.add("password", ["min", "nonalphamin", "regex"], function (options) {
+        if (options.params.min) {
+            setValidationValues(options, "minlength", options.params.min);
+        }
+        if (options.params.nonalphamin) {
+            setValidationValues(options, "nonalphamin", options.params.nonalphamin);
+        }
+        if (options.params.regex) {
+            setValidationValues(options, "regex", options.params.regex);
+        }
+    });
+    adapters.add("fileextensions", ["extensions"], function (options) {
+        setValidationValues(options, "extension", options.params.extensions);
+    });
+
+    $(function () {
+        $jQval.unobtrusive.parse(document);
+    });
+
+    return $jQval.unobtrusive;
+}));

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/jquery-validation/LICENSE.md

@@ -0,0 +1,22 @@
+The MIT License (MIT)
+=====================
+
+Copyright Jörn Zaefferer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

SpotifyAPI.Web.Examples.ASP/wwwroot/lib/jquery/LICENSE.txt

@@ -0,0 +1,36 @@
+Copyright JS Foundation and other contributors, https://js.foundation/
+
+This software consists of voluntary contributions made by many
+individuals. For exact contribution history, see the revision history
+available at https://github.com/jquery/jquery
+
+The following license applies to all parts of this software except as
+documented below:
+
+====
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+====
+
+All files located in the node_modules and external directories are
+externally maintained libraries used by this software which have their
+own licenses; we recommend you read them, as their terms may differ from
+the terms above.

SpotifyAPI.Web.Examples.CLI/Program.cs

@@ -1,9 +1,10 @@
 using System;
+using System.Threading.Tasks;
 using SpotifyAPI.Web.Auth;
 using SpotifyAPI.Web.Enums;
 using SpotifyAPI.Web.Models;
 
-namespace SpotifyAPI.Web.Example
+namespace SpotifyAPI.Web.Examples.CLI
 {
     internal static class Program
     {
@@ -11,7 +12,7 @@ namespace SpotifyAPI.Web.Example
         private static string _secretId = ""; //"";
 
         // ReSharper disable once UnusedParameter.Local
-        static void Main(string[] args)
+        public static void Main(string[] args)
         {
             _clientId = string.IsNullOrEmpty(_clientId)
                 ? Environment.GetEnvironmentVariable("SPOTIFY_CLIENT_ID")
@@ -26,7 +27,7 @@ namespace SpotifyAPI.Web.Example
             Console.WriteLine(
                 "Tip: If you want to supply your ClientID and SecretId beforehand, use env variables (SPOTIFY_CLIENT_ID and SPOTIFY_SECRET_ID)");
 
-            AuthorizationCodeAuth auth =
+            var auth =
                 new AuthorizationCodeAuth(_clientId, _secretId, "http://localhost:4002", "http://localhost:4002",
                     Scope.PlaylistReadPrivate | Scope.PlaylistReadCollaborative);
             auth.AuthReceived += AuthOnAuthReceived;
@@ -42,38 +43,35 @@ namespace SpotifyAPI.Web.Example
 
         private static async void AuthOnAuthReceived(object sender, AuthorizationCode payload)
         {
-            AuthorizationCodeAuth auth = (AuthorizationCodeAuth) sender;
+            var auth = (AuthorizationCodeAuth) sender;
             auth.Stop();
 
-            
-
             Token token = await auth.ExchangeCode(payload.Code);
-            SpotifyWebAPI api = new SpotifyWebAPI
+            var api = new SpotifyWebAPI
             {
                 AccessToken = token.AccessToken,
                 TokenType = token.TokenType
             };
-            PrintUsefulData(api);
+            await PrintUsefulData(api);
         }
 
-        private static async void PrintUsefulData(SpotifyWebAPI api)
+        private static async Task PrintAllPlaylistTracks(SpotifyWebAPI api, Paging<SimplePlaylist> playlists)
+        {
+            if (playlists.Items == null) return;
+            
+            playlists.Items.ForEach(playlist => Console.WriteLine($"- {playlist.Name}"));
+            if(playlists.HasNextPage())
+                await PrintAllPlaylistTracks(api, await api.GetNextPageAsync(playlists));
+        }
+
+        private static async Task PrintUsefulData(SpotifyWebAPI api)
         { 
             PrivateProfile profile = await api.GetPrivateProfileAsync();
             string name = string.IsNullOrEmpty(profile.DisplayName) ? profile.Id : profile.DisplayName;
             Console.WriteLine($"Hello there, {name}!");
 
             Console.WriteLine("Your playlists:");
-            Paging<SimplePlaylist> playlists = await api.GetUserPlaylistsAsync(profile.Id);
-            do
-            {
-                playlists.Items.ForEach(playlist =>
-                {
-                    Console.WriteLine($"- {playlist.Name}");
-                });
-                playlists = await api.GetNextPageAsync(playlists);
-            } while (playlists.HasNextPage());
-
-
+            await PrintAllPlaylistTracks(api, api.GetUserPlaylists(profile.Id));
         }
     }
 }

SpotifyAPI.Web.Examples.CLI/SpotifyAPI.Web.Examples.CLI.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>netcoreapp3.0</TargetFramework>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\SpotifyAPI.Web.Auth\SpotifyAPI.Web.Auth.csproj" />
+    </ItemGroup>
+
+</Project>

SpotifyAPI.sln

@@ -7,10 +7,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SpotifyAPI.Web", "SpotifyAP
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SpotifyAPI.Web.Tests", "SpotifyAPI.Web.Tests\SpotifyAPI.Web.Tests.csproj", "{47FD780C-47B2-4634-9BB4-83C660101FAE}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SpotifyAPI.Web.Example", "SpotifyAPI.Web.Example\SpotifyAPI.Web.Example.csproj", "{8D1CCA36-C7C2-4A70-B194-B23D7E03F00A}"
-EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpotifyAPI.Web.Auth", "SpotifyAPI.Web.Auth\SpotifyAPI.Web.Auth.csproj", "{400A3787-FDBE-4A4C-9DDD-AAEB3DCE1DF5}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "SpotifyAPI.Web.Examples", "SpotifyAPI.Web.Examples", "{62023FC7-B2B6-40B4-8CDD-862746255017}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpotifyAPI.Web.Examples.CLI", "SpotifyAPI.Web.Examples.CLI\SpotifyAPI.Web.Examples.CLI.csproj", "{679FB001-D671-45E9-A660-86A3A7A37093}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpotifyAPI.Web.Examples.ASP", "SpotifyAPI.Web.Examples.ASP\SpotifyAPI.Web.Examples.ASP.csproj", "{67D6E6AC-E082-4047-81BB-A7DFD980F1B7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -25,14 +29,18 @@ Global
 		{47FD780C-47B2-4634-9BB4-83C660101FAE}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{47FD780C-47B2-4634-9BB4-83C660101FAE}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{47FD780C-47B2-4634-9BB4-83C660101FAE}.Release|Any CPU.Build.0 = Release|Any CPU
-		{8D1CCA36-C7C2-4A70-B194-B23D7E03F00A}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{8D1CCA36-C7C2-4A70-B194-B23D7E03F00A}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{8D1CCA36-C7C2-4A70-B194-B23D7E03F00A}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{8D1CCA36-C7C2-4A70-B194-B23D7E03F00A}.Release|Any CPU.Build.0 = Release|Any CPU
 		{400A3787-FDBE-4A4C-9DDD-AAEB3DCE1DF5}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{400A3787-FDBE-4A4C-9DDD-AAEB3DCE1DF5}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{400A3787-FDBE-4A4C-9DDD-AAEB3DCE1DF5}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{400A3787-FDBE-4A4C-9DDD-AAEB3DCE1DF5}.Release|Any CPU.Build.0 = Release|Any CPU
+		{679FB001-D671-45E9-A660-86A3A7A37093}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{679FB001-D671-45E9-A660-86A3A7A37093}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{679FB001-D671-45E9-A660-86A3A7A37093}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{679FB001-D671-45E9-A660-86A3A7A37093}.Release|Any CPU.Build.0 = Release|Any CPU
+		{67D6E6AC-E082-4047-81BB-A7DFD980F1B7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{67D6E6AC-E082-4047-81BB-A7DFD980F1B7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{67D6E6AC-E082-4047-81BB-A7DFD980F1B7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{67D6E6AC-E082-4047-81BB-A7DFD980F1B7}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -40,4 +48,8 @@ Global
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {097062B8-0E87-43C8-BD98-61843A68BE6D}
 	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{679FB001-D671-45E9-A660-86A3A7A37093} = {62023FC7-B2B6-40B4-8CDD-862746255017}
+		{67D6E6AC-E082-4047-81BB-A7DFD980F1B7} = {62023FC7-B2B6-40B4-8CDD-862746255017}
+	EndGlobalSection
 EndGlobal