<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><title>Client Authentication using tokens · Apache Pulsar</title><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta name="generator" content="Docusaurus"/><meta name="description" content="## Token Authentication Overview"/><meta name="docsearch:version" content="2.3.0"/><meta name="docsearch:language" content="en"/><meta property="og:title" content="Client Authentication using tokens · Apache Pulsar"/><meta property="og:type" content="website"/><meta property="og:url" content="https://pulsar.apache.org/"/><meta property="og:description" content="## Token Authentication Overview"/><meta name="twitter:card" content="summary"/><meta name="twitter:image" content="https://pulsar.apache.org/img/pulsar.svg"/><link rel="shortcut icon" href="/img/pulsar.ico"/><link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/atom-one-dark.min.css"/><link rel="alternate" type="application/atom+xml" href="https://pulsar.apache.org/blog/atom.xml" title="Apache Pulsar Blog ATOM Feed"/><link rel="alternate" type="application/rss+xml" href="https://pulsar.apache.org/blog/feed.xml" title="Apache Pulsar Blog RSS Feed"/><link rel="stylesheet" href="/css/code-blocks-buttons.css"/><script type="text/javascript" src="https://buttons.github.io/buttons.js"></script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js"></script><script type="text/javascript" src="/js/custom.js"></script><script src="/js/scrollSpy.js"></script><link rel="stylesheet" href="/css/main.css"/><script src="/js/codetabs.js"></script></head><body class="sideNavVisible separateOnPageNav"><div class="fixedHeaderContainer"><div class="headerWrapper wrapper"><header><a href="/en"><img class="logo" src="/img/pulsar.svg" alt="Apache Pulsar"/></a><a href="/en/versions"><h3>2.3.0</h3></a><div class="navigationWrapper navigationSlider"><nav class="slidingNav"><ul class="nav-site nav-site-internal"><li class="siteNavGroupActive"><a href="/docs/en/2.3.0/getting-started-standalone" target="_self">Docs</a></li><li class=""><a href="/en/download" target="_self">Download</a></li><li class="siteNavGroupActive"><a href="/docs/en/2.3.0/client-libraries" target="_self">Clients</a></li><li class=""><a href="#restapis" target="_self">REST APIs</a></li><li class=""><a href="#cli" target="_self">Cli</a></li><li class=""><a href="/blog/" target="_self">Blog</a></li><li class=""><a href="#community" target="_self">Community</a></li><li class=""><a href="#apache" target="_self">Apache</a></li><li class=""><a href="https://pulsar-next.staged.apache.org/" target="_self">New Website (Beta)</a></li><span><li><a id="languages-menu" href="#"><img class="languages-icon" src="/img/language.svg" alt="Languages icon"/>English</a><div id="languages-dropdown" class="hide"><ul id="languages-dropdown-items"><li><a href="/docs/ja/2.3.0/security-token-client">日本語</a></li><li><a href="/docs/fr/2.3.0/security-token-client">Français</a></li><li><a href="/docs/ko/2.3.0/security-token-client">한국어</a></li><li><a href="/docs/zh-CN/2.3.0/security-token-client">中文</a></li><li><a href="/docs/zh-TW/2.3.0/security-token-client">繁體中文</a></li><li><a href="https://crowdin.com/project/apache-pulsar" target="_blank" rel="noreferrer noopener">Help Translate</a></li></ul></div></li><script>
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<p>Pulsar supports authenticating clients using security tokens that are based on
<a href="https://jwt.io/introduction/">JSON Web Tokens</a> (<a href="https://tools.ietf.org/html/rfc7519">RFC-7519</a>).</p>
<p>Tokens are used to identify a Pulsar client and associate with some &quot;principal&quot; (or &quot;role&quot;) which
will be then granted permissions to do some actions (eg: publish or consume from a topic).</p>
<p>A user will typically be given a token string by an administrator (or some automated service).</p>
<p>The compact representation of a signed JWT is a string that looks like:</p>
<pre><code class="hljs"> eyJhbGciOiJIUzI<span class="hljs-number">1</span><span class="hljs-symbol">NiJ9</span>.eyJzdWIiOiJKb<span class="hljs-number">2</span>UifQ.ipevR<span class="hljs-symbol">NuRP6</span>Hfl<span class="hljs-name">G8</span>cFK<span class="hljs-symbol">nmUPtypruRC4</span>fb<span class="hljs-number">1</span>DWtoLL<span class="hljs-number">62</span>SY
</code></pre>
<p>Application will specify the token when creating the client instance. An alternative is to pass
a &quot;token supplier&quot;, that is to say a function that returns the token when the client library
will need one.</p>
<p>See <a href="/docs/en/2.3.0/security-token-admin">Token authentication admin</a> for a reference on how to enable token
authentication on a Pulsar cluster.</p>
<h3><a class="anchor" aria-hidden="true" id="cli-tools"></a><a href="#cli-tools" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>CLI tools</h3>
<p><a href="/docs/en/2.3.0/reference-cli-tools">Command-line tools</a> like <a href="/docs/en/2.3.0/reference-pulsar-admin"><code>pulsar-admin</code></a>, <a href="/docs/en/2.3.0/reference-cli-tools#pulsar-perf"><code>pulsar-perf</code></a>, and <a href="/docs/en/2.3.0/reference-cli-tools#pulsar-client"><code>pulsar-client</code></a> use the <code>conf/client.conf</code> config file in a Pulsar installation.</p>
<p>You'll need to add the following parameters to that file to use the token authentication with
Pulsar's CLI tools:</p>
<pre><code class="hljs css language-properties"><span class="hljs-attr">webServiceUrl</span>=<span class="hljs-string">http://broker.example.com:8080/</span>
<span class="hljs-attr">brokerServiceUrl</span>=<span class="hljs-string">pulsar://broker.example.com:6650/</span>
<span class="hljs-attr">authPlugin</span>=<span class="hljs-string">org.apache.pulsar.client.impl.auth.AuthenticationToken</span>
<span class="hljs-attr">authParams</span>=<span class="hljs-string">token:eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY</span>
</code></pre>
<p>The token string can also be read from a file, eg:</p>
<pre><code class="hljs">authParams=file:<span class="hljs-regexp">//</span><span class="hljs-regexp">/path/</span>to<span class="hljs-regexp">/token/</span>file
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="java-client"></a><a href="#java-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Java client</h3>
<pre><code class="hljs css language-java">PulsarClient client = PulsarClient.builder()
    .serviceUrl(<span class="hljs-string">"pulsar://broker.example.com:6650/"</span>)
    .authentication(
        AuthenticationFactory.token(<span class="hljs-string">"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"</span>)
    .build();
</code></pre>
<p>Similarly, one can also pass a <code>Supplier</code>:</p>
<pre><code class="hljs css language-java">PulsarClient client = PulsarClient.builder()
    .serviceUrl(<span class="hljs-string">"pulsar://broker.example.com:6650/"</span>)
    .authentication(
        AuthenticationFactory.token(() -&gt; {
            <span class="hljs-comment">// Read token from custom source</span>
            <span class="hljs-keyword">return</span> readToken();
        })
    .build();
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="python-client"></a><a href="#python-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Python client</h3>
<pre><code class="hljs css language-python"><span class="hljs-keyword">from</span> pulsar <span class="hljs-keyword">import</span> Client, AuthenticationToken

client = Client(<span class="hljs-string">'pulsar://broker.example.com:6650/'</span>
                authentication=AuthenticationToken(<span class="hljs-string">'eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY'</span>))
</code></pre>
<p>Alternatively, with a supplier:</p>
<pre><code class="hljs css language-python">
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">read_token</span><span class="hljs-params">()</span>:</span>
    <span class="hljs-keyword">with</span> open(<span class="hljs-string">'/path/to/token.txt'</span>) <span class="hljs-keyword">as</span> tf:
        <span class="hljs-keyword">return</span> tf.read().strip()

client = Client(<span class="hljs-string">'pulsar://broker.example.com:6650/'</span>
                authentication=AuthenticationToken(read_token))
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="go-client"></a><a href="#go-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Go client</h3>
<pre><code class="hljs css language-go">client, err := NewClient(ClientOptions{
    URL:            <span class="hljs-string">"pulsar://localhost:6650"</span>,
    Authentication: NewAuthenticationToken(<span class="hljs-string">"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"</span>),
})
</code></pre>
<p>Alternatively, with a supplier:</p>
<pre><code class="hljs css language-go">client, err := NewClient(ClientOptions{
    URL:            <span class="hljs-string">"pulsar://localhost:6650"</span>,
    Authentication: NewAuthenticationTokenSupplier(<span class="hljs-function"><span class="hljs-keyword">func</span> <span class="hljs-params">()</span> <span class="hljs-title">string</span></span> {
        <span class="hljs-comment">// Read token from custom source</span>
        <span class="hljs-keyword">return</span> readToken()
    }),
})
</code></pre>
<h3><a class="anchor" aria-hidden="true" id="c-client"></a><a href="#c-client" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>C++ client</h3>
<pre><code class="hljs css language-c++"><span class="hljs-meta">#<span class="hljs-meta-keyword">include</span> <span class="hljs-meta-string">&lt;pulsar/Client.h&gt;</span></span>

pulsar::ClientConfiguration <span class="hljs-built_in">config</span>;
<span class="hljs-built_in">config</span>.setAuth(pulsar::AuthToken::createWithToken(<span class="hljs-string">"eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJKb2UifQ.ipevRNuRP6HflG8cFKnmUPtypruRC4fb1DWtoLL62SY"</span>));

<span class="hljs-function">pulsar::<span class="hljs-built_in">Client</span> <span class="hljs-title">client</span><span class="hljs-params">(<span class="hljs-string">"pulsar://broker.example.com:6650/"</span>, <span class="hljs-built_in">config</span>)</span></span>;
</code></pre>
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