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<h2 id="usage">Usage</h2>
<p>See the <a href="http://shaarli.github.io/api-documentation/">REST API documentation</a>.</p>
<h2 id="authentication">Authentication</h2>
<p>All requests to Shaarli's API must include a JWT token to verify their authenticity.</p>
<p>This token has to be included as an HTTP header called <code>Authentication: Bearer <jwt token></code>.</p>
<p>JWT resources :</p>
<ul>
<li><a href="https://jwt.io">jwt.io</a> (including a list of client per language).</li>
<li>RFC : https://tools.ietf.org/html/rfc7519</li>
<li>https://float-middle.com/json-web-tokens-jwt-vs-sessions/</li>
<li>HackerNews thread: https://news.ycombinator.com/item?id=11929267</li>
</ul>
<h3 id="shaarli-jwt-token">Shaarli JWT Token</h3>
<p>JWT tokens are composed by three parts, separated by a dot <code>.</code> and encoded in base64:</p>
<pre><code>[header].[payload].[signature]
</code></pre>
<h4 id="header">Header</h4>
<p>Shaarli only allow one hash algorithm, so the header will always be the same:</p>
<pre><code class="json">{
"typ": "JWT",
"alg": "HS512"
}
</code></pre>
<p>Encoded in base64, it gives:</p>
<pre><code>ewogICAgICAgICJ0eXAiOiAiSldUIiwKICAgICAgICAiYWxnIjogIkhTNTEyIgogICAgfQ==
</code></pre>
<h4 id="payload">Payload</h4>
<p><strong>Validity duration</strong></p>
<p>To avoid infinite token validity, JWT tokens must include their creation date in UNIX timestamp format (timezone independant - UTC) under the key <code>iat</code> (issued at). This token will be accepted during 9 minutes.</p>
<pre><code class="json">{
"iat": 1468663519
}
</code></pre>
<p>See <a href="https://tools.ietf.org/html/rfc7519#section-4.1.6">RFC reference</a>.</p>
<h4 id="signature">Signature</h4>
<p>The signature authenticate the token validity. It contains the base64 of the header and the body, separated by a dot <code>.</code>, hashed in SHA512 with the API secret available in Shaarli administration page.</p>
<p>Signature example with PHP:</p>
<pre><code class="php">$content = base64_encode($header) . '.' . base64_encode($payload);
$signature = hash_hmac('sha512', $content, $secret);
</code></pre>
<h3 id="complete-example">Complete example</h3>
<h4 id="php">PHP</h4>
<pre><code class="php">function generateToken($secret) {
$header = base64_encode('{
"typ": "JWT",
"alg": "HS512"
}');
$payload = base64_encode('{
"iat": '. time() .'
}');
$signature = hash_hmac('sha512', $header .'.'. $payload , $secret);
return $header .'.'. $payload .'.'. $signature;
}
$secret = 'mysecret';
$token = generateToken($secret);
echo $token;
</code></pre>
<blockquote>
<p><code>ewogICAgICAgICJ0eXAiOiAiSldUIiwKICAgICAgICAiYWxnIjogIkhTNTEyIgogICAgfQ==.ewogICAgICAgICJpYXQiOiAxNDY4NjY3MDQ3CiAgICB9.1d2c54fa947daf594fdbf7591796195652c8bc63bffad7f6a6db2a41c313f495a542cbfb595acade79e83f3810d709b4251d7b940bbc10b531a6e6134af63a68</code></p>
</blockquote>
<pre><code class="php">$options = [
'http' => [
'method' => 'GET',
'jwt' => $token,
],
];
$context = stream_context_create($options);
file_get_contents($apiEndpoint, false, $context);
</code></pre>
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