Spotify.NET/docs/next/token_swap/index.html
2020-07-13 13:52:43 +00:00

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<title data-react-helmet="true">Token Swap | SpotifyAPI-NET</title><meta data-react-helmet="true" name="docsearch:version" content="next"><meta data-react-helmet="true" name="twitter:card" content="summary_large_image"><meta data-react-helmet="true" property="og:title" content="Token Swap | SpotifyAPI-NET"><meta data-react-helmet="true" name="description" content="Token Swap provides an authenticatiow flow where client-side apps (like cli/desktop/mobile apps) are still able to use long-living tokens and the oppurtunity to refresh them without exposing your application&#x27;s secret. This however requires a server-side part to work."><meta data-react-helmet="true" property="og:description" content="Token Swap provides an authenticatiow flow where client-side apps (like cli/desktop/mobile apps) are still able to use long-living tokens and the oppurtunity to refresh them without exposing your application&#x27;s secret. This however requires a server-side part to work."><meta data-react-helmet="true" property="og:url" content="https://johnnycrazy.github.io/SpotifyAPI-NET/docs/next/token_swap"><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/next/token_swap"><link rel="stylesheet" href="/SpotifyAPI-NET/styles.8a053330.css">
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class="menu__list-item"><a class="menu__link" tabindex="-1" href="/SpotifyAPI-NET/docs/next/example_token_swap">Token Swap</a></li><li class="menu__list-item"><a class="menu__link" tabindex="-1" href="/SpotifyAPI-NET/docs/next/example_uwp">UWP</a></li></ul></li></ul></li></ul></div></div></div><main class="docMainContainer_FFX1"><div class="container padding-vert--lg docItemWrapper_1cc7"><div class="row"><div class="col docItemCol_2GOA"><div class="docItemContainer_2cwg"><article><div><span class="badge badge--secondary">Version: next</span></div><header><h1 class="docTitle_1vWb">Token Swap</h1></header><div class="markdown"><p>Token Swap provides an authenticatiow flow where client-side apps (like cli/desktop/mobile apps) are still able to use long-living tokens and the oppurtunity to refresh them without exposing your application&#x27;s secret. This however requires a server-side part to work.</p><p>It is based on the <a href="/SpotifyAPI-NET/docs/next/authorization_code">Authorization Code</a> flow and is also documented by spotify: <a href="https://developer.spotify.com/documentation/ios/guides/token-swap-and-refresh/" target="_blank" rel="noopener noreferrer">Token Swap and Refresh </a>.</p><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="flow"></a>Flow<a aria-hidden="true" tabindex="-1" class="hash-link" href="#flow" title="Direct link to heading">#</a></h2><p>The client uses the first part of the <code>Authorization Code</code> flow and redirects the user to spotify&#x27;s login page. In this part, only the client id is required. Once the user logged in and confirmed the usage of your app, he will be redirect to a <code>http://localhost</code> server which grabs the <code>code</code> from the query parameters.</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">var request = new LoginRequest(&quot;http://localhost&quot;, &quot;ClientId&quot;, LoginRequest.ResponseType.Code)</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> Scope = new List&lt;string&gt; { Scopes.UserReadEmail }</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">};</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">BrowserUtil.Open(uri);</span></div></div></div></div></div><p>Now, swapping out this <code>code</code> for an <code>access_token</code> would require the app&#x27;s client secret. We don&#x27;t have this on the client-side. Instead, we send a request to our server, which takes care of the code swap:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">public Task GetCallback(string code)</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">{</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> var response = await new OAuthClient().RequestToken(</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> new TokenSwapTokenRequest(&quot;https://your-swap-server.com/swap&quot;, code)</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> );</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> var spotify = new SpotifyClient(response.AccessToken);</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> // Also important for later: response.RefreshToken</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">}</span></div></div></div></div></div><p>The server swapped out the <code>code</code> for an <code>access_token</code> and <code>refresh_token</code>. Once we realize the <code>access_token</code> expired, we can also ask the server to refresh it:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-csharp codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token plain">// if response.IsExpired is true</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var newResponse = await new OAuthClient().RequestToken(</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> new TokenSwapTokenRequest(&quot;https://your-swap-server.com/refresh&quot;, response.RefreshToken)</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">);</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block">
</span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain">var spotify = new SpotifyClient(newResponse.AccessToken);</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="server-implementation"></a>Server Implementation<a aria-hidden="true" tabindex="-1" class="hash-link" href="#server-implementation" title="Direct link to heading">#</a></h2><p>The server needs to support two endpoints, <code>/swap</code> and <code>/refresh</code> (endpoints can be named differently of course)</p><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="swap"></a>Swap<a aria-hidden="true" tabindex="-1" class="hash-link" href="#swap" title="Direct link to heading">#</a></h3><p>The client sends a body via <code>application/x-www-form-urlencoded</code> where the received <code>code</code> is included. In cURL:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-bash codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token function" style="color:rgb(130, 170, 255)">curl</span><span class="token plain"> -X POST </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;https://example.com/v1/swap&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;Content-Type: application/x-www-form-urlencoded&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> --data </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;code=AQDy8...xMhKNA&quot;</span></div></div></div></div></div><p>The server needs to respond with content-type <code>application/json</code> and the at least the following body:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-json codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;access_token&quot;</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;NgAagA...Um_SHo&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;expires_in&quot;</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;3600&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;refresh_token&quot;</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;NgCXRK...MzYjw&quot;</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span></div></div></div></div></div><h3><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="refresh"></a>Refresh<a aria-hidden="true" tabindex="-1" class="hash-link" href="#refresh" title="Direct link to heading">#</a></h3><p>The client sends a body via <code>application/x-www-form-urlencoded</code> where the received <code>refresh_token</code> is included. In cURL:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-bash codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token function" style="color:rgb(130, 170, 255)">curl</span><span class="token plain"> -X POST </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;https://example.com/v1/refresh&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> -H </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;Content-Type: application/x-www-form-urlencoded&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> --data </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;refresh_token=NgCXRK...MzYjw&quot;</span></div></div></div></div></div><p>The server needs to respond with content-type <code>application/json</code> and the at least the following body:</p><div class="mdxCodeBlock_iHAB"><div class="codeBlockContent_32p_"><button type="button" aria-label="Copy code to clipboard" class="copyButton_1BYj">Copy</button><div tabindex="0" class="prism-code language-json codeBlock_19pQ"><div class="codeBlockLines_2n9r" style="color:#bfc7d5;background-color:#292d3e"><div class="token-line" style="color:#bfc7d5"><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;access_token&quot;</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;NgAagA...Um_SHo&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token property">&quot;expires_in&quot;</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">&quot;3600&quot;</span><span class="token plain"></span></div><div class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span></div></div></div></div></div><h2><a aria-hidden="true" tabindex="-1" class="anchor enhancedAnchor_ZqCz" id="example"></a>Example<a aria-hidden="true" tabindex="-1" class="hash-link" href="#example" title="Direct link to heading">#</a></h2><p>An example server has been implemented in NodeJS with a .NET CLI client, located at <a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/tree/master/SpotifyAPI.Web.Examples/Example.TokenSwap">Example.TokenSwap</a></p></div></article><div class="margin-vert--xl"><div class="row"><div class="col"><a href="https://github.com/JohnnyCrazy/SpotifyAPI-NET/edit/master/SpotifyAPI.Docs/docs/token_swap.md" target="_blank" rel="noreferrer noopener"><svg fill="currentColor" height="1.2em" width="1.2em" preserveAspectRatio="xMidYMid meet" viewBox="0 0 40 40" style="margin-right:0.3em;vertical-align:sub"><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 text--right"><em><small>Last updated on <time datetime="2020-07-13T13:49:36.000Z" class="docLastUpdatedAt_1sqk">7/13/2020</time> by <strong>Jonas Dellinger</strong></small></em></div></div></div><div class="margin-vert--lg"><nav class="pagination-nav"><div class="pagination-nav__item"><a class="pagination-nav__link" href="/SpotifyAPI-NET/docs/next/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/next/showcase"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Showcase »</div></a></div></nav></div></div></div><div class="col col--3"><div class="tableOfContents_TbNY"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#flow" class="table-of-contents__link">Flow</a></li><li><a href="#server-implementation" class="table-of-contents__link">Server 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