signalk-server
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An implementation of a [Signal K](http://signalk.org) server for boats.
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<h1 class="menu-title">Signal K Server Documentation</h1>
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<h1 id="working-with-the-resources-api"><a class="header" href="#working-with-the-resources-api">Working with the Resources API</a></h1>
<h2 id="overview"><a class="header" href="#overview">Overview</a></h2>
<p>The SignalK specification defines a number of resources (routes, waypoints, notes, regions & charts) each with its own path under the root <code>resources</code> path <em>(e.g. <code>/signalk/v2/api/resources/routes</code>)</em>.</p>
<p>Additionally, the <code>/resources</code> path can be used to host other user defined resource types, each grouped within its own folder <em>(e.g. <code>/signalk/v2/api/resources/fishingZones</code>)</em>.</p>
<p>The <em>Resources API</em> validates requests to these resource paths and passes them to a <a href="../plugins/resource_provider_plugins.html">Resource Provider plugin</a> for storage and retrieval.</p>
<p>Client applications can then use <code>HTTP</code> requests to these paths to store (<code>POST</code>, <code>PUT</code>), retrieve (<code>GET</code>) and remove (<code>DELETE</code>) resource entries.</p>
<p><em>Note: the ability to store resource entries is controlled by the server security settings so client applications may need to authenticate for write / delete operations to complete successfully.</em></p>
<h3 id="retrieving-resources"><a class="header" href="#retrieving-resources">Retrieving Resources</a></h3>
<hr />
<p>Resource entries are retrived by submitting an HTTP <code>GET</code> request to the relevant path.</p>
<p>For example to return a list of all available routes</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/routes'
</code></pre>
<p>or alternatively fetch a specific route.</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/routes/94052456-65fa-48ce-a85d-41b78a9d2111'
</code></pre>
<p>A filtered list of entries can be retrieved based on criteria such as:</p>
<ul>
<li>being within a bounded area</li>
<li>distance from vessel</li>
<li>total entries returned</li>
<li>map zoom level</li>
</ul>
<p>by supplying a query string containing <code>key | value</code> pairs in the request.</p>
<p><em>Example 1: Retrieve waypoints within 50km of the vessel. Note: distance in meters value should be provided.</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints?distance=50000'
</code></pre>
<p><em>Example 2: Retrieve up to 20 waypoints within 90km of the vessel.</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints?distance=90000&limit=20'
</code></pre>
<p><em>Example 3: Retrieve waypoints within a bounded area. Note: the bounded area is supplied as bottom left & top right corner coordinates in the form swLongitude,swLatitude,neLongitude,neLatitude</em>.</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints?bbox=[-135.5,38,-134,38.5]'
</code></pre>
<p>_Example 4: Return notes for display on a map view at zoom level 5.</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/notes?zoom=5'
</code></pre>
<p>It is up to the provider to determine which resource entries are returned for any given zoom level. As a guide we recommend alignment with the criteria in the following document: https://wiki.openstreetmap.org/wiki/Zoom_levels_.</p>
<h3 id="deleting-resources"><a class="header" href="#deleting-resources">Deleting Resources</a></h3>
<hr />
<p>Resource entries are deleted by submitting an HTTP <code>DELETE</code> request to a path containing the <code>id</code> of the resource to delete.</p>
<p><em>Example: Delete from storage the route with id <code>94052456-65fa-48ce-a85d-41b78a9d2111</code>.</em></p>
<pre><code class="language-typescript">HTTP DELETE 'http://hostname:3000/signalk/v2/api/resources/routes/94052456-65fa-48ce-a85d-41b78a9d2111'
</code></pre>
<h3 id="creating--updating-resources"><a class="header" href="#creating--updating-resources">Creating / updating Resources</a></h3>
<hr />
<p><strong>Creating a new resource entry:</strong></p>
<p>Resource entries are created by submitting an HTTP <code>POST</code> request to a path for the relevant resource type.</p>
<pre><code class="language-typescript">HTTP POST 'http://hostname:3000/signalk/v2/api/resources/routes' {resource_data}
</code></pre>
<p>The new resource is created and its <code>id</code> (generated by the server) is returned in the response message.</p>
<pre><code class="language-JSON">{
"state": "COMPLETED",
"statusCode": 200,
"id": "94052456-65fa-48ce-a85d-41b78a9d2111"
}
</code></pre>
<p><em>Note: Each <code>POST</code> will generate a new <code>id</code> so if the resource data remains the same duplicate resources will be created.</em></p>
<p><strong>Updating a resource entry:</strong></p>
<p>Resource entries are updated by submitting an HTTP <code>PUT</code> request to a path for the relevant resource type that includes the resource <code>id</code>.</p>
<pre><code class="language-typescript">HTTP PUT 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111'
</code></pre>
<p>As the <code>PUT</code> request replaces the record with the supplied <code>id</code>, the submitted resource data should contain a complete record for the resource type being written.</p>
<p>Each resource type has a specific set of attributes that are required to be supplied before the resource entry can be created or updated.</p>
<p>If either the submitted resource data or the resource id are invalid then the operation is aborted._</p>
<p><em>Note: the submitted resource data is validated against the OpenApi schema definition for the relevant resource type.</em></p>
<hr />
<h2 id="multiple-providers-for-a-resource-type"><a class="header" href="#multiple-providers-for-a-resource-type">Multiple Providers for a Resource Type</a></h2>
<p>The Resources API will allow for multiple plugins to register as a provider for the same resource type.</p>
<p>When this scenario occurs the server services request in the following ways:</p>
<p><strong>Listing entries:</strong></p>
<p>When a list of resources is requested</p>
<p><em>for example:</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints'
</code></pre>
<p>each registered provider will be asked to return matching entries and the server aggregates the results and returns them to the client.</p>
<hr />
<p><strong>Requests for specific resources:</strong></p>
<p>When a request is received for a specific resource</p>
<p><em>for example:</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111'
HTTP PUT 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111'
HTTP DELETE 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111'
</code></pre>
<p>each registered provider will polled to determine which one owns the entry with the supplied id. The provider with the resource entry is then the target of the requested operation (<code>getResource()</code>, <code>setResource()</code>, <code>deleteResource()</code>).</p>
<hr />
<p><strong>Creating new resource entries:</strong></p>
<p>When a request is received to create a new resource</p>
<p><em>for example:</em></p>
<pre><code class="language-typescript">HTTP POST 'http://hostname:3000/signalk/v2/api/resources/waypoints'
</code></pre>
<p>By default the first provider that was registered for that resource type will be the target of the requested operation (<code>setResource()</code>).</p>
<p>You can view the registered providers for a resource type by making the following request:</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/{resourceType}/_providers'
</code></pre>
<p>_Example: `HTTP GET 'http://hostname:3000/signalk/v2/api/resources/charts/_providers'</p>
<pre><code class="language-JSON">[
"charts",
"resources-provider"
]
</code></pre>
<p>You can retrieve the default provider for a resource type by making the following request:</p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/{resourceType}/_providers/_default'
</code></pre>
<p>Example: `HTTP GET 'http://hostname:3000/signalk/v2/api/resources/charts/_providers/_default'</p>
<pre><code class="language-JSON">"resources-provider"
</code></pre>
<p>You can change the provider used for writing a resource record in the following ways:</p>
<ol>
<li>Per-request by using the <code>?provider=</code> query parameter.</li>
<li>Setting a "default" provider for a specific resource type</li>
</ol>
<p><strong>1. Per-request by using the <code>?provider=</code> query parameter:</strong></p>
<p>When multiple providers are registered for a resource type the client can specify which provider should be the target of the request by using the query parameter <code>provider</code>.</p>
<p><em>Example:</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints?provider=my-plugin-id'
HTTP GET 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111?provider=my-plugin-id'
HTTP PUT 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111?provider=my-plugin-id'
HTTP DELETE 'http://hostname:3000/signalk/v2/api/resources/waypoints/94052456-65fa-48ce-a85d-41b78a9d2111?provider=my-plugin-id'
HTTP POST 'http://hostname:3000/signalk/v2/api/resources/waypoints?provider=my-plugin-id'
</code></pre>
<p>the value assigned to <code>provider</code> is the <code>plugin id</code> of the resource provider plugin.</p>
<p>The plugin id can be obtained from the Signal K server url <em>http://hostname:3000/skServer/plugins</em>.</p>
<p><em>Example:</em></p>
<pre><code class="language-typescript">HTTP GET 'http://hostname:3000/plugins'
</code></pre>
<pre><code class="language-JSON">[
{
"id": "mysk-resource-plugin", // <-- plugin id
"name": "Resources Provider",
"packageName": "mysk-resource-plugin",
"version": "1.3.0",
...
},
...
]
</code></pre>
<p><strong>2. Setting a default provider for a resource type:</strong></p>
<p>To change the default provider for a resource type make a POST request to <em>http://hostname:3000/signalk/v2/api/resources/{resourceType}/_providers/_default/{pluginId}</em> where <code>pluginId</code> is the id of resource provider plugin.</p>
<p><em>Example: Direct create new chart source entries to <code>my-chart-plugin</code>.</em></p>
<pre><code class="language-typescript">HTTP POST 'http://hostname:3000/signalk/v2/api/resources/charts/_providers/_default/my-chart-plugin'
</code></pre>
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