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<h1 id="how-to-use">📖 How to Use</h1>
<p>All operations are plain <code>async</code> functions that work identically under
FastAPI, Flask, a CLI, or a script. Substitute your own repository to change
the persistence backend.</p>
<hr />
<h2 id="register-a-user">✍️ Register a user</h2>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-0-1"> 1</a></span>
<span class="normal"><a href="#__codelineno-0-2"> 2</a></span>
<span class="normal"><a href="#__codelineno-0-3"> 3</a></span>
<span class="normal"><a href="#__codelineno-0-4"> 4</a></span>
<span class="normal"><a href="#__codelineno-0-5"> 5</a></span>
<span class="normal"><a href="#__codelineno-0-6"> 6</a></span>
<span class="normal"><a href="#__codelineno-0-7"> 7</a></span>
<span class="normal"><a href="#__codelineno-0-8"> 8</a></span>
<span class="normal"><a href="#__codelineno-0-9"> 9</a></span>
<span class="normal"><a href="#__codelineno-0-10">10</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1"></a><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span>
</span><span id="__span-0-2"><a id="__codelineno-0-2" name="__codelineno-0-2"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">register_user</span><span class="p">,</span> <span class="n">RegisterRequest</span>
</span><span id="__span-0-3"><a id="__codelineno-0-3" name="__codelineno-0-3"></a>
</span><span id="__span-0-4"><a id="__codelineno-0-4" name="__codelineno-0-4"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
</span><span id="__span-0-5"><a id="__codelineno-0-5" name="__codelineno-0-5"></a> <span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">register_user</span><span class="p">(</span>
</span><span id="__span-0-6"><a id="__codelineno-0-6" name="__codelineno-0-6"></a> <span class="n">RegisterRequest</span><span class="p">(</span><span class="n">username</span><span class="o">=</span><span class="s2">&quot;admin&quot;</span><span class="p">,</span> <span class="n">email</span><span class="o">=</span><span class="s2">&quot;admin@aetoskia.com&quot;</span><span class="p">,</span> <span class="n">password</span><span class="o">=</span><span class="s2">&quot;hunter2&quot;</span><span class="p">)</span>
</span><span id="__span-0-7"><a id="__codelineno-0-7" name="__codelineno-0-7"></a> <span class="p">)</span>
</span><span id="__span-0-8"><a id="__codelineno-0-8" name="__codelineno-0-8"></a> <span class="nb">print</span><span class="p">(</span><span class="n">user</span><span class="o">.</span><span class="n">username</span><span class="p">,</span> <span class="n">user</span><span class="o">.</span><span class="n">is_active</span><span class="p">)</span>
</span><span id="__span-0-9"><a id="__codelineno-0-9" name="__codelineno-0-9"></a>
</span><span id="__span-0-10"><a id="__codelineno-0-10" name="__codelineno-0-10"></a><span class="n">asyncio</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">main</span><span class="p">())</span>
</span></code></pre></div></td></tr></table></div>
<p>Returns a <code>PublicUser</code>. Registration hashes the password before it reaches the
repository.</p>
<hr />
<h2 id="log-in">🔑 Log in</h2>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-1-1">1</a></span>
<span class="normal"><a href="#__codelineno-1-2">2</a></span>
<span class="normal"><a href="#__codelineno-1-3">3</a></span>
<span class="normal"><a href="#__codelineno-1-4">4</a></span>
<span class="normal"><a href="#__codelineno-1-5">5</a></span>
<span class="normal"><a href="#__codelineno-1-6">6</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">login_user</span><span class="p">,</span> <span class="n">LoginRequest</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2"></a>
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3"></a><span class="n">response</span> <span class="o">=</span> <span class="k">await</span> <span class="n">login_user</span><span class="p">(</span><span class="n">LoginRequest</span><span class="p">(</span><span class="n">username</span><span class="o">=</span><span class="s2">&quot;admin&quot;</span><span class="p">,</span> <span class="n">password</span><span class="o">=</span><span class="s2">&quot;hunter2&quot;</span><span class="p">))</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a><span class="n">response</span><span class="o">.</span><span class="n">access_token</span> <span class="c1"># store this in the Authorization header</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a><span class="n">response</span><span class="o">.</span><span class="n">user</span><span class="o">.</span><span class="n">username</span>
</span></code></pre></div></td></tr></table></div>
<p>A successful login returns <code>LoginResponse</code> with an access token and the public
user. Failures raise <code>AuthError</code> subclasses; catch them and map to your HTTP
semantics (e.g. 401).</p>
<hr />
<h2 id="check-the-current-user">👤 Check the current user</h2>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-2-1">1</a></span>
<span class="normal"><a href="#__codelineno-2-2">2</a></span>
<span class="normal"><a href="#__codelineno-2-3">3</a></span>
<span class="normal"><a href="#__codelineno-2-4">4</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-2-1"><a id="__codelineno-2-1" name="__codelineno-2-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">get_logged_in_user</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3"></a><span class="n">user</span> <span class="o">=</span> <span class="k">await</span> <span class="n">get_logged_in_user</span><span class="p">(</span><span class="n">bearer_token</span><span class="p">)</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4"></a><span class="nb">print</span><span class="p">(</span><span class="n">user</span><span class="o">.</span><span class="n">username</span><span class="p">,</span> <span class="n">user</span><span class="o">.</span><span class="n">email</span><span class="p">,</span> <span class="n">user</span><span class="o">.</span><span class="n">is_active</span><span class="p">)</span>
</span></code></pre></div></td></tr></table></div>
<p>Resolves the token subject to a <code>PublicUser</code>. Raises <code>InvalidToken</code> if the
token is missing, expired, or malformed, and <code>UserNotFound</code> if the subject no
longer exists.</p>
<hr />
<h2 id="log-out">🚪 Log out</h2>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-3-1">1</a></span>
<span class="normal"><a href="#__codelineno-3-2">2</a></span>
<span class="normal"><a href="#__codelineno-3-3">3</a></span>
<span class="normal"><a href="#__codelineno-3-4">4</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-3-1"><a id="__codelineno-3-1" name="__codelineno-3-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">logout_user</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2"></a>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="n">result</span> <span class="o">=</span> <span class="k">await</span> <span class="n">logout_user</span><span class="p">()</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4"></a><span class="nb">print</span><span class="p">(</span><span class="n">result</span><span class="o">.</span><span class="n">message</span><span class="p">)</span>
</span></code></pre></div></td></tr></table></div>
<p>Logout is a client-side signal: the returned <code>LogoutResponse</code> tells the caller
to discard the stored token. Stateless services should simply stop using the
token after logout.</p>
<hr />
<h2 id="introspect-a-token">🔎 Introspect a token</h2>
<p>Verify an arbitrary token and get a structured verdict:</p>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-4-1">1</a></span>
<span class="normal"><a href="#__codelineno-4-2">2</a></span>
<span class="normal"><a href="#__codelineno-4-3">3</a></span>
<span class="normal"><a href="#__codelineno-4-4">4</a></span>
<span class="normal"><a href="#__codelineno-4-5">5</a></span>
<span class="normal"><a href="#__codelineno-4-6">6</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-4-1"><a id="__codelineno-4-1" name="__codelineno-4-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">introspect_token</span>
</span><span id="__span-4-2"><a id="__codelineno-4-2" name="__codelineno-4-2"></a>
</span><span id="__span-4-3"><a id="__codelineno-4-3" name="__codelineno-4-3"></a><span class="n">verdict</span> <span class="o">=</span> <span class="k">await</span> <span class="n">introspect_token</span><span class="p">(</span><span class="n">bearer_token</span><span class="p">)</span>
</span><span id="__span-4-4"><a id="__codelineno-4-4" name="__codelineno-4-4"></a>
</span><span id="__span-4-5"><a id="__codelineno-4-5" name="__codelineno-4-5"></a><span class="n">verdict</span><span class="o">.</span><span class="n">active</span> <span class="c1"># True when the token is valid</span>
</span><span id="__span-4-6"><a id="__codelineno-4-6" name="__codelineno-4-6"></a><span class="n">verdict</span><span class="o">.</span><span class="n">user</span><span class="o">.</span><span class="n">username</span> <span class="c1"># resolved subject, or None</span>
</span></code></pre></div></td></tr></table></div>
<p><code>IntrospectResponse</code> also provides result helpers used by the canonical
service for error mapping. For a pure boolean authorization check:</p>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-5-1">1</a></span>
<span class="normal"><a href="#__codelineno-5-2">2</a></span>
<span class="normal"><a href="#__codelineno-5-3">3</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-5-1"><a id="__codelineno-5-1" name="__codelineno-5-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib.introspection</span><span class="w"> </span><span class="kn">import</span> <span class="n">authenticate_request</span>
</span><span id="__span-5-2"><a id="__codelineno-5-2" name="__codelineno-5-2"></a>
</span><span id="__span-5-3"><a id="__codelineno-5-3" name="__codelineno-5-3"></a><span class="n">ok</span> <span class="o">=</span> <span class="k">await</span> <span class="n">authenticate_request</span><span class="p">(</span><span class="n">bearer_token</span><span class="p">)</span> <span class="c1"># True / False</span>
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="injecting-a-custom-repository">💉 Injecting a custom repository</h2>
<p>Every operation accepts an optional <code>repo</code>. Provide your own
<code>UserRepository</code>-compatible object to swap storage:</p>
<div class="language-python highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"><a href="#__codelineno-6-1">1</a></span>
<span class="normal"><a href="#__codelineno-6-2">2</a></span>
<span class="normal"><a href="#__codelineno-6-3">3</a></span>
<span class="normal"><a href="#__codelineno-6-4">4</a></span>
<span class="normal"><a href="#__codelineno-6-5">5</a></span>
<span class="normal"><a href="#__codelineno-6-6">6</a></span>
<span class="normal"><a href="#__codelineno-6-7">7</a></span></pre></div></td><td class="code"><div><pre><span></span><code><span id="__span-6-1"><a id="__codelineno-6-1" name="__codelineno-6-1"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwtlib</span><span class="w"> </span><span class="kn">import</span> <span class="n">login_user</span><span class="p">,</span> <span class="n">LoginRequest</span>
</span><span id="__span-6-2"><a id="__codelineno-6-2" name="__codelineno-6-2"></a>
</span><span id="__span-6-3"><a id="__codelineno-6-3" name="__codelineno-6-3"></a><span class="k">class</span><span class="w"> </span><span class="nc">MyRepo</span><span class="p">:</span>
</span><span id="__span-6-4"><a id="__codelineno-6-4" name="__codelineno-6-4"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">get_by_username</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">username</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span> <span class="o">...</span>
</span><span id="__span-6-5"><a id="__codelineno-6-5" name="__codelineno-6-5"></a> <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">authenticate_user</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">user_auth</span><span class="p">:</span> <span class="n">LoginRequest</span><span class="p">):</span> <span class="o">...</span>
</span><span id="__span-6-6"><a id="__codelineno-6-6" name="__codelineno-6-6"></a>
</span><span id="__span-6-7"><a id="__codelineno-6-7" name="__codelineno-6-7"></a><span class="n">response</span> <span class="o">=</span> <span class="k">await</span> <span class="n">login_user</span><span class="p">(</span><span class="n">LoginRequest</span><span class="p">(</span><span class="n">username</span><span class="o">=</span><span class="s2">&quot;admin&quot;</span><span class="p">,</span> <span class="n">password</span><span class="o">=</span><span class="s2">&quot;x&quot;</span><span class="p">),</span> <span class="n">repo</span><span class="o">=</span><span class="n">MyRepo</span><span class="p">())</span>
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="read-next">📚 Read Next</h2>
<ul>
<li><a href="../03_integration/">Framework Integration</a> — FastAPI dependency wiring.</li>
<li><a href="../01_overview/">Overview</a> — architecture and models.</li>
</ul>
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