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<h1 id="introspection">Introspection</h1>
<div class="doc doc-object doc-module">
<h2 id="jwtlib.introspection" class="doc doc-heading">
<span class="doc doc-object-name doc-module-name">jwtlib.introspection</span>
</h2>
<div class="doc doc-contents first">
<p>Auth client and access-control utilities.</p>
<p>This module provides <strong>pure authentication and authorization logic</strong>
for validating JWTs via service-to-service introspection and resolving
authenticated users.</p>
<p>Key characteristics:
- No framework or HTTP routing dependencies
- Async-first and fully typed
- Designed for use by adapters (HTTP, CLI, background workers)
- Delegates token validity decisions to an external auth service</p>
<p>Responsibilities:
- Calling the auth service introspection endpoint
- Translating introspection responses into typed user models
- Enforcing access control decisions at the logic layer</p>
<p>This module does NOT:
- Parse HTTP requests or headers
- Implement authentication policies
- Perform JWT signature verification locally</p>
<div class="doc doc-children">
<div class="doc doc-object doc-function">
<h3 id="jwtlib.introspection.authenticate_request" class="doc doc-heading">
<span class="doc doc-object-name doc-function-name">authenticate_request</span>
<span class="doc doc-labels">
<small class="doc doc-label doc-label-async"><code>async</code></small>
</span>
</h3>
<div class="doc-signature highlight"><pre><span></span><code><span class="nf">authenticate_request</span><span class="p">(</span><span class="n">should_skip_authentication</span><span class="p">:</span> <span class="n">Callable</span><span class="p">[[</span><span class="nb">str</span><span class="p">,</span> <span class="nb">str</span><span class="p">],</span> <span class="nb">bool</span><span class="p">],</span> <span class="o">*</span><span class="p">,</span> <span class="n">method</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">path</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">authorization_token</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="nb">str</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="n">Optional</span><span class="p">[</span><span class="n">PublicUser</span><span class="p">]</span>
</code></pre></div>
<div class="doc doc-contents ">
<p>Authenticate an incoming request using token introspection.</p>
<p>Determines whether authentication should be skipped for the given
request context and, if not, resolves the authenticated user via
token introspection.</p>
<p><span class="doc-section-title">Parameters:</span></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
<th>Default</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td><code>should_skip_authentication</code></td>
<td>
<code><span title="typing.Callable">Callable</span>[[str, str], bool]</code>
</td>
<td>
<div class="doc-md-description">
<p>Callable that decides whether
authentication is required for a given HTTP method and path.</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td><code>method</code></td>
<td>
<code>str</code>
</td>
<td>
<div class="doc-md-description">
<p>HTTP method of the incoming request.</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td><code>path</code></td>
<td>
<code>str</code>
</td>
<td>
<div class="doc-md-description">
<p>Request path.</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
<tr class="doc-section-item">
<td><code>authorization_token</code></td>
<td>
<code><span title="typing.Optional">Optional</span>[str]</code>
</td>
<td>
<div class="doc-md-description">
<p>JWT access token provided by the caller.</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Returns:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><span title="typing.Optional">Optional</span>[<a class="autorefs autorefs-internal" title="jwtlib.models.PublicUser" href="../models/#jwtlib.models.PublicUser">PublicUser</a>]</code>
</td>
<td>
<div class="doc-md-description">
<p>PublicUser if authentication succeeds.</p>
</div>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code><span title="typing.Optional">Optional</span>[<a class="autorefs autorefs-internal" title="jwtlib.models.PublicUser" href="../models/#jwtlib.models.PublicUser">PublicUser</a>]</code>
</td>
<td>
<div class="doc-md-description">
<p>None if authentication is skipped.</p>
</div>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Raises:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><a class="autorefs autorefs-internal" title="jwtlib.exceptions.InvalidToken" href="../exceptions/#jwtlib.exceptions.InvalidToken">InvalidToken</a></code>
</td>
<td>
<div class="doc-md-description">
<p>If authentication is required but the token is
missing, invalid, or revoked.</p>
</div>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code><a class="autorefs autorefs-internal" title="jwtlib.exceptions.AuthServiceUnavailable" href="../exceptions/#jwtlib.exceptions.AuthServiceUnavailable">AuthServiceUnavailable</a></code>
</td>
<td>
<div class="doc-md-description">
<p>If the auth service cannot be reached.</p>
</div>
</td>
</tr>
</tbody>
</table>
<details class="notes" open>
<summary>Notes</summary>
<ul>
<li>This function does not parse Authorization headers; callers must
supply the raw token.</li>
<li>Access-control policy is externalized via <code>should_skip_authentication</code>.</li>
<li>The returned PublicUser contains no sensitive information.</li>
</ul>
</details>
</div>
</div>
<div class="doc doc-object doc-function">
<h3 id="jwtlib.introspection.introspect_token" class="doc doc-heading">
<span class="doc doc-object-name doc-function-name">introspect_token</span>
<span class="doc doc-labels">
<small class="doc doc-label doc-label-async"><code>async</code></small>
</span>
</h3>
<div class="doc-signature highlight"><pre><span></span><code><span class="nf">introspect_token</span><span class="p">(</span><span class="n">token</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">]</span>
</code></pre></div>
<div class="doc doc-contents ">
<p>Introspect a JWT using the external authentication service.</p>
<p>Sends the provided JWT to the configured auth service introspection
endpoint and validates the response.</p>
<p><span class="doc-section-title">Parameters:</span></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Type</th>
<th>Description</th>
<th>Default</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td><code>token</code></td>
<td>
<code>str</code>
</td>
<td>
<div class="doc-md-description">
<p>JWT access token to introspect.</p>
</div>
</td>
<td>
<em>required</em>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Returns:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code>dict[str, <span title="typing.Any">Any</span>]</code>
</td>
<td>
<div class="doc-md-description">
<p>A dictionary containing the authenticated user's public payload.</p>
</div>
</td>
</tr>
</tbody>
</table>
<p><span class="doc-section-title">Raises:</span></p>
<table>
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr class="doc-section-item">
<td>
<code><a class="autorefs autorefs-internal" title="jwtlib.exceptions.InvalidToken" href="../exceptions/#jwtlib.exceptions.InvalidToken">InvalidToken</a></code>
</td>
<td>
<div class="doc-md-description">
<p>If the token is missing, invalid, inactive, or revoked.</p>
</div>
</td>
</tr>
<tr class="doc-section-item">
<td>
<code><a class="autorefs autorefs-internal" title="jwtlib.exceptions.AuthServiceUnavailable" href="../exceptions/#jwtlib.exceptions.AuthServiceUnavailable">AuthServiceUnavailable</a></code>
</td>
<td>
<div class="doc-md-description">
<p>If the auth service cannot be reached or
fails unexpectedly.</p>
</div>
</td>
</tr>
</tbody>
</table>
<details class="notes" open>
<summary>Notes</summary>
<ul>
<li>This function treats the auth service as the source of truth.</li>
<li>No local JWT validation or signature checking is performed here.</li>
<li>The returned payload is expected to be safe for public exposure.</li>
</ul>
</details>
</div>
</div>
</div>
</div>
</div>
</article>
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