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<h1 id="openapi-first-openapi-as-the-single-source-of-truth">🧩 openapi-first — OpenAPI as the Single Source of Truth</h1>
<p><code>openapi-first</code> is a small, strict library for <strong>OpenAPI-first FastAPI bootstrapping</strong>: the OpenAPI document <em>is</em> the application contract — not an afterthought generated from decorators)Skip. Routes, schemas, security, and even the HTTP client are all derived from one specification.</p>
<blockquote>
<p><strong>Doc model:</strong> this wiki is written for humans — how-to guides, examples, and usage recipes. The authoritative API contracts live in the code (docstrings) and the machine-readable bundle under <code>docs/mcp/</code>.</p>
</blockquote>
<hr />
<h2 id="key-features">🚀 Key Features</h2>
<ul>
<li>📜 <strong>One spec, two sides</strong> — the same OpenAPI document boots both a FastAPI server (<code>OpenAPIFirstApp</code>) and a strict HTTP client (<code>OpenAPIClient</code>)</li>
<li>🔗 <strong><code>operationId</code> binding</strong> — handler functions are bound to routes purely by <code>operationId</code>; no routing decorators</li>
<li>🧱 <strong>Fail-fast contracts</strong> — startup and client construction fail loudly when a handler, operation, or security scheme is missing</li>
<li>🛡️ <strong>Spec-driven security</strong><code>securitySchemes</code> + per-operation <code>security</code> auto-injected as FastAPI dependencies (Bearer JWT introspection included)</li>
<li>🧠 <strong>Contract-first codegen</strong><code>models</code> (Pydantic) and <code>routes</code> (resource stubs) generated from a spec</li>
<li>🧩 <strong>Bundled templates</strong><code>health_app</code>, <code>crud_app</code>, <code>model_app</code>, <code>vet_app</code> scaffolds for the whole lifecycle, from <code>/health</code> to SSE + multi-resource CRUD</li>
</ul>
<hr />
<h2 id="installation">📦 Installation</h2>
<p>From your internal PyPI:</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>pip<span class="w"> </span>install<span class="w"> </span>--extra-index-url<span class="w"> </span>https://<span class="nv">$PYPI_USERNAME</span>:<span class="nv">$PYPI_PASSWORD</span>@pip.aetoskia.com/simple<span class="w"> </span>openapi-first
</span></code></pre></div></td></tr></table></div>
<p>From local source:</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-1-1">1</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>pip<span class="w"> </span>install<span class="w"> </span>-e<span class="w"> </span>.
</span></code></pre></div></td></tr></table></div>
<hr />
<h2 id="documentation-structure">📁 Documentation Structure</h2>
<table>
<thead>
<tr>
<th>Section</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="01_overview/">Overview</a></td>
<td>The mental model: spec as contract, <code>operationId</code> binding, fail-fast guarantees</td>
</tr>
<tr>
<td><a href="02_components/">Components</a></td>
<td><code>app</code>, <code>binder</code>, <code>loader</code>, <code>client</code>, <code>errors</code>, <code>security</code>, <code>codegen</code>, <code>cli</code></td>
</tr>
<tr>
<td><strong>Use cases</strong></td>
<td>Step-by-step recipes</td>
</tr>
<tr>
<td>· <a href="03_use_cases/01_quickstart/">01 Quickstart</a></td>
<td>Scaffold your first OpenAPI-first service</td>
</tr>
<tr>
<td>· <a href="03_use_cases/02_templates/">02 Templates</a></td>
<td>The bundled application templates and how to use them</td>
</tr>
<tr>
<td>· <a href="03_use_cases/03_client/">03 Client setup</a></td>
<td>Build an <code>operationId</code>-driven HTTP client</td>
</tr>
<tr>
<td>· <a href="03_use_cases/04_codegen/">04 Codegen</a></td>
<td>Generate Pydantic models and route stubs from a spec</td>
</tr>
<tr>
<td><a href="04_design/">Design</a></td>
<td>Architecture, responsibilities, and startup pipeline</td>
</tr>
<tr>
<td><a href="05_security/">Security</a></td>
<td><code>securitySchemes</code>, env resolution, and JWT introspection</td>
</tr>
<tr>
<td><a href="06_error_handling/">Error Handling</a></td>
<td>The error hierarchy and when each error is raised</td>
</tr>
<tr>
<td><a href="07_testing/">Testing</a></td>
<td>Test strategy, quality gates, and coverage</td>
</tr>
</tbody>
</table>
<hr />
<h2 id="related-resources">🔗 Related Resources</h2>
<ul>
<li><strong>Source Code:</strong> <a href="https://git.aetoskia.com/aetos/openapi-first">Gitea Repository</a></li>
<li><strong>Internal PyPI:</strong> <a href="https://pip.aetoskia.com/simple/openapi-first">pip.aetoskia.com/simple/openapi-first</a></li>
<li><strong>Drone CI:</strong> Auto-builds and publishes tagged releases, gated on black / ruff / mypy / pytest.</li>
</ul>
<hr />
<p>© Aetoskia Internal — <code>openapi-first</code> 0.0.6</p>
</article>
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