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<title data-react-helmet="true">PKCE | SpotifyAPI-NET</title><meta data-react-helmet="true" property="og:url" content="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/pkce"><meta data-react-helmet="true" name="docusaurus_locale" content="en"><meta data-react-helmet="true" name="docusaurus_version" content="current"><meta data-react-helmet="true" name="docusaurus_tag" content="docs-default-current"><meta data-react-helmet="true" property="og:title" content="PKCE | SpotifyAPI-NET"><meta data-react-helmet="true" name="description" content="The authorization code flow with PKCE is the best option for mobile and desktop applications where it is unsafe to store your client secret. It provides your app with an access token that can be refreshed. For further information about this flow, see IETF RFC-7636."><meta data-react-helmet="true" property="og:description" content="The authorization code flow with PKCE is the best option for mobile and desktop applications where it is unsafe to store your client secret. It provides your app with an access token that can be refreshed. For further information about this flow, see IETF RFC-7636."><link data-react-helmet="true" rel="shortcut icon" href="/SpotifyAPI-NET/img/favicon.ico"><link data-react-helmet="true" rel="canonical" href="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/pkce"><link data-react-helmet="true" rel="alternate" href="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/pkce" hreflang="en"><link data-react-helmet="true" rel="alternate" href="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/pkce" hreflang="x-default"><link rel="stylesheet" href="/SpotifyAPI-NET/assets/css/styles.834af7f3.css">
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tocCollapsibleButton_2O1e">On this page</button></div><div class="markdown"><header><h1 class="h1Heading_27L5">PKCE</h1></header><blockquote><p>The authorization code flow with PKCE is the best option for mobile and desktop applications where it is unsafe to store your client secret. It provides your app with an access token that can be refreshed. For further information about this flow, see <a href="https://tools.ietf.org/html/rfc7636" target="_blank" rel="noopener noreferrer">IETF RFC-7636</a>.</p></blockquote><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2LWZ" id="generating-challenge--verifier"></a>Generating Challenge & Verifier<a class="hash-link" href="#generating-challenge--verifier" title="Direct link to heading">#</a></h2><p>For every authentication request, a verify code and its challenge code needs to be generated. The class <code>PKCEUtil</code> can be used to generate those, either with random generated or self supplied values:</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly csharp"><pre tabindex="0" class="prism-code language-csharp codeBlock_23N8 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#bfc7d5"><span class="token plain">// Generates a secure random verifier of length 100 and its challenge</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var (verifier, challenge) = PKCEUtil.GenerateCodes();</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">// Generates a secure random verifier of length 120 and its challenge</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var (verifier, challenge) = PKCEUtil.GenerateCodes(120);</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">// Returns the passed string and its challenge (Make sure it's random and long enough)</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var (verifier, challenge) = PKCEUtil.GenerateCodes("YourSecureRandomString");</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_2LWZ" id="generating-login-uri"></a>Generating Login URI<a class="hash-link" href="#generating-login-uri" title="Direct link to heading">#</a></h2><p>Like most auth flows, you'll need to redirect your user to Spotify's servers so they are able to grant access to your application:</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly csharp"><pre tabindex="0" class="prism-code language-csharp codeBlock_23N8 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#bfc7d5"><span class="token plain">// Make sure "http://localhost:5000/callback" is in your applications redirect URIs!</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var loginRequest = new LoginRequest(</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> new Uri("http://localhost:5000/callback"),</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> "YourClientId",</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> LoginRequest.ResponseType.Code</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">)</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> CodeChallengeMethod = "S256",</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> CodeChallenge = challenge,</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> Scope = new[] { Scopes.PlaylistReadPrivate, Scopes.PlaylistReadCollaborative }</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">};</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var uri = loginRequest.ToUri();</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">// Redirect user to uri via your favorite web-server or open a local browser window</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>When the user is redirected to the generated uri, they will have to login with their Spotify account and confirm that your application wants to access their user data. Once confirmed, they will be redirected to <code>http://localhost:5000/callback</code> and a <code>code</code> parameter is attached to the query. The redirect URI can also contain a custom protocol paired with UWP App Custom Protocol handler. This received <code>code</code> has to be exchanged for an <code>access_token</code> and <code>refresh_token</code>:</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly csharp"><pre tabindex="0" class="prism-code language-csharp codeBlock_23N8 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#bfc7d5"><span class="token plain">// This method should be called from your web-server when the user visits "http://localhost:5000/callback"</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">public Task GetCallback(string code)</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> // Note that we use the verifier calculated above!</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> var initialResponse = await new OAuthClient().RequestToken(</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> new PKCETokenRequest("ClientId", code, "http://localhost:5000", verifier)</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> );</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> var spotify = new SpotifyClient(initialResponse.AccessToken);</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> // Also important for later: response.RefreshToken</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">}</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>With PKCE you can also refresh tokens once they're expired:</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly csharp"><pre tabindex="0" class="prism-code language-csharp codeBlock_23N8 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#bfc7d5"><span class="token plain">var newResponse = await new OAuthClient().RequestToken(</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> new PKCETokenRefreshRequest("ClientId", initialResponse.RefreshToken)</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">);</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var spotify = new SpotifyClient(newResponse.AccessToken);</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div><p>If you do not want to take care of manually refreshing tokens, you can use <code>PKCEAuthenticator</code>:</p><div class="codeBlockContainer_K1bP"><div class="codeBlockContent_hGly csharp"><pre tabindex="0" class="prism-code language-csharp codeBlock_23N8 thin-scrollbar" style="color:#bfc7d5;background-color:#292d3e"><code class="codeBlockLines_39YC"><span class="token-line" style="color:#bfc7d5"><span class="token plain">var authenticator = new PKCEAuthenticator(clientId, initialResponse);</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
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</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var config = SpotifyClientConfig.CreateDefault()</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> .WithAuthenticator(authenticator);</span></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">var spotify = new SpotifyClient(config);</span></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_Ue-o clean-btn">Copy</button></div></div></div><footer class="row docusaurus-mt-lg"><div class="col"><a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/edit/master/SpotifyAPI.Docs/docs/pkce.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_2_ui" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_3DPF">Last updated on <b><time datetime="2022-02-13T21:23:53.000Z">2/13/2022</time></b> by <b>dependabot[bot]</b></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/SpotifyAPI-NET/docs/authorization_code"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">« Authorization Code</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/SpotifyAPI-NET/docs/token_swap"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Token Swap »</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_35-E thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#generating-challenge--verifier" class="table-of-contents__link">Generating Challenge & Verifier</a></li><li><a href="#generating-login-uri" class="table-of-contents__link">Generating Login URI</a></li></ul></div></div></div></div></main></div></div><footer class="footer footer--dark"><div class="container"><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2022 Jonas Dellinger. Built with Docusaurus.</div></div></div></footer></div>
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