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Path 1: jwtlib client (py-jwt)
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<h1 id="platform-integration">Platform Integration</h1>
<p>This page is for <strong>service authors</strong> wiring authentication into Aetos
applications. It covers both supported integration paths.</p>
<h2 id="path-1-jwtlib-client-py-jwt">Path 1: <code>jwtlib</code> client (<code>py-jwt</code>)</h2>
<p>Services that depend on the <code>py-jwt</code> library can authenticate requests
without an OpenAPI generator. Set the auth server base URL:</p>
<div class="language-bash 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></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="nb">export</span><span class="w"> </span><span class="nv">JWT_SERVER</span><span class="o">=</span>http://auth.aetoskia.com
</span></code></pre></div></td></tr></table></div>
<p>Then verify incoming requests:</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-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>
<span class="normal"><a href="#__codelineno-1-7">7</a></span>
<span class="normal"><a href="#__codelineno-1-8">8</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.introspection</span><span class="w"> </span><span class="kn">import</span> <span class="n">authenticate_request</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">authorized</span> <span class="o">=</span> <span class="k">await</span> <span class="n">authenticate_request</span><span class="p">(</span>
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4"></a> <span class="n">should_skip_authentication</span><span class="p">,</span> <span class="c1"># e.g. allow public paths</span>
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5"></a> <span class="n">method</span><span class="p">,</span>
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6"></a> <span class="n">path</span><span class="p">,</span>
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7"></a> <span class="n">authorization_token</span><span class="p">,</span> <span class="c1"># &quot;Bearer &lt;jwt&gt;&quot; or None</span>
</span><span id="__span-1-8"><a id="__codelineno-1-8" name="__codelineno-1-8"></a><span class="p">)</span>
</span></code></pre></div></td></tr></table></div>
<p><code>authenticate_request</code> POSTs <code>{"token": "&lt;jwt&gt;"}</code> to
<code>{JWT_SERVER}/introspect</code> (3 second timeout) and treats
<code>{"active": true, "user": {...}}</code> as valid. Transport errors surface as
<code>AuthServiceUnavailable</code>.</p>
<p>For zero-request validation (offline token decode), <code>jwtlib</code> also exposes the
token payload helpers used by the auth server itself — see the
<code>py-jwt</code> documentation.</p>
<h2 id="path-2-openapi-first-generated-dependencies">Path 2: <code>openapi-first</code> generated dependencies</h2>
<p>Services declared with an <strong>OpenAPI-first</strong> contract can generate their
FastAPI dependencies from the spec. Declare a bearer security scheme pointing
at the auth server:</p>
<div class="language-yaml 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>
<span class="normal"><a href="#__codelineno-2-5">5</a></span>
<span class="normal"><a href="#__codelineno-2-6">6</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="nt">securitySchemes</span><span class="p">:</span>
</span><span id="__span-2-2"><a id="__codelineno-2-2" name="__codelineno-2-2"></a><span class="w"> </span><span class="nt">HTTPBearer</span><span class="p">:</span>
</span><span id="__span-2-3"><a id="__codelineno-2-3" name="__codelineno-2-3"></a><span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">http</span>
</span><span id="__span-2-4"><a id="__codelineno-2-4" name="__codelineno-2-4"></a><span class="w"> </span><span class="nt">scheme</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">bearer</span>
</span><span id="__span-2-5"><a id="__codelineno-2-5" name="__codelineno-2-5"></a><span class="w"> </span><span class="nt">x-server-url</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">https://auth.aetoskia.com</span>
</span><span id="__span-2-6"><a id="__codelineno-2-6" name="__codelineno-2-6"></a><span class="w"> </span><span class="nt">x-introspect-path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">/introspect</span>
</span></code></pre></div></td></tr></table></div>
<p>The generated dependency then POSTs <code>{"token": token}</code> to the introspection
path and returns the user on <code>active == true</code>, raising <code>401</code> on invalid or
inactive tokens and <code>503</code> when the auth server is unreachable.</p>
<h2 id="the-introspect-contract">The <code>/introspect</code> contract</h2>
<table>
<thead>
<tr>
<th>Field</th>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>request</td>
<td><code>token</code> (string)</td>
<td>The JWT to verify</td>
</tr>
<tr>
<td>response</td>
<td><code>active</code> (bool)</td>
<td>Whether the token is valid and active</td>
</tr>
<tr>
<td>response</td>
<td><code>user</code> (PublicUser | null)</td>
<td>The profile when active</td>
</tr>
</tbody>
</table>
<p>The endpoint <strong>always answers <code>200</code></strong> — validity is expressed through
<code>active</code>. <code>IntrospectResponse</code> never raises, so the caller can act on the
tri-state (valid / invalid / user missing) without exception handling.</p>
<h2 id="protecting-endpoints-in-fastapi">Protecting endpoints in FastAPI</h2>
<p>For first-party services, mount the auth router's dependency directly:</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-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>
<span class="normal"><a href="#__codelineno-3-5">5</a></span>
<span class="normal"><a href="#__codelineno-3-6">6</a></span>
<span class="normal"><a href="#__codelineno-3-7">7</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">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">Depends</span>
</span><span id="__span-3-2"><a id="__codelineno-3-2" name="__codelineno-3-2"></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">PublicUser</span>
</span><span id="__span-3-3"><a id="__codelineno-3-3" name="__codelineno-3-3"></a><span class="kn">from</span><span class="w"> </span><span class="nn">jwt</span><span class="w"> </span><span class="kn">import</span> <span class="n">get_current_user</span>
</span><span id="__span-3-4"><a id="__codelineno-3-4" name="__codelineno-3-4"></a>
</span><span id="__span-3-5"><a id="__codelineno-3-5" name="__codelineno-3-5"></a><span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;/profile&quot;</span><span class="p">)</span>
</span><span id="__span-3-6"><a id="__codelineno-3-6" name="__codelineno-3-6"></a><span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">profile</span><span class="p">(</span><span class="n">current_user</span><span class="p">:</span> <span class="n">PublicUser</span> <span class="o">=</span> <span class="n">Depends</span><span class="p">(</span><span class="n">get_current_user</span><span class="p">)):</span>
</span><span id="__span-3-7"><a id="__codelineno-3-7" name="__codelineno-3-7"></a> <span class="k">return</span> <span class="n">current_user</span>
</span></code></pre></div></td></tr></table></div>
<h2 id="golden-rules">Golden rules</h2>
<ol>
<li><strong>Never trust an unverified token</strong> — always decode through <code>jwtlib</code> or
introspect before handling the request.</li>
<li><strong>Treat <code>active: false</code> as unauthenticated</strong>, even if the JWT decodes.</li>
<li><strong>Do not implement your own JWT parsing</strong> — use a generated dependency or
the <code>jwtlib</code> client so revocation and issuer changes stay centralized.</li>
</ol>
<hr />
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