Server middleware

The Amagaki server can be extended with Express middleware. This may be useful
in a variety of scenarios, such as:

Enforcing authentication flows, i.e. for headless CMS or content integrations
Adding headers or metadata to the HTTP responses, i.e. for testing production
behavior
Extending the functionality of Amagaki with custom request handlers

Remember, Amagaki is intended to be a static site generator. Request handlers
made available on the server will not be available in production when serving a
fully static site. Therefore, server middleware is most useful for adding
functionality that enhances development velocity and the development workflow.

Examples

amagaki.ts

export default (pod: Pod) => {
    const serverPlugin = pod.plugins.get('ServerPlugin') as ServerPlugin;
 
<span class="hljs-comment">// Immediate example. Use for registering Express middleware.</span>
serverPlugin.register(<span class="hljs-function"><span class="hljs-params">app</span> =&gt;</span> {
    app.use(<span class="hljs-string">&#x27;/foo&#x27;</span>, <span class="hljs-function">(<span class="hljs-params">req, res</span>) =&gt;</span> {
        res.send(<span class="hljs-string">&#x27;This is a response from custom middleware.&#x27;</span>);
    });
});

<span class="hljs-comment">// Async example. Use for running some task prior to server startup.</span>
serverPlugin.register(<span class="hljs-keyword">async</span> () =&gt; {
    <span class="hljs-keyword">const</span> promise = <span class="hljs-function">() =&gt;</span> {
        <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">Promise</span>&lt;<span class="hljs-built_in">void</span>&gt;(<span class="hljs-function"><span class="hljs-params">resolve</span> =&gt;</span> {
            <span class="hljs-built_in">setTimeout</span>(<span class="hljs-function">() =&gt;</span> {
                <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&#x27;tested&#x27;</span>);
                resolve();
            }, <span class="hljs-number">2000</span>);
        });
    };
    <span class="hljs-keyword">await</span> promise();
});

}

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