Make API calls to Home Assistant based on Dash button pushes.

index.js

+'use strict';
+
+/**
+ * LIBRARIES
+ */
+
+var dashButton = require( 'node-dash-button' );
+var request    = require( 'request' );
+
+/**
+ * CONFIGURATION & EVENT BINDING
+ */
+
+var config = require( './config.json' );
+
+Object.keys( config.buttons ).forEach( function( index ) {
+    var buttonConfig = config.buttons[index];
+
+    var button = dashButton( buttonConfig.mac, config.arp_interface );
+
+    button.on( 'detected', buttonActivated );
+} );
+
+var homeAssistantApiBase = config.home_assistant_proto + '://' + config.home_assistant_host + ':' + config.home_assistant_port + '/api/';
+
+/**
+ * BUTTON FUNCTIONALITY
+ */
+
+/**
+ * Make HTTP(s) requests to Home Assistant to toggle status of device assigned to pushed button
+ */
+function buttonActivated( mac ) {
+    var buttonConfig = config.buttons[mac];
+
+    var req = {
+        url: homeAssistantApiBase + 'states/' + buttonConfig.status.entity_id,
+        headers: {
+            'Content-Type': 'application/json',
+            'x-ha-access': config.home_assistant_pass
+        }
+    };
+console.log( req );
+    // First, check the current status so we can toggle
+    request( req, function( err, res, body ) {
+        // Handle error states
+        if ( err ) {
+            console.error( err );
+            return;
+        }
+
+        if ( 200 !== res.statusCode ) {
+            console.error( res.statusCode );
+            return;
+        }
+
+        // HA only deals with JSON
+        body = JSON.parse( body );
+
+        var service = null,
+            postBody        = {};
+
+        if ( 'off' === body.state ) {
+            service            = buttonConfig.on.entity + '/turn_on';
+            postBody.entity_id = buttonConfig.on.entity_id;
+        } else if ( 'on' === body.state ) {
+            service            = buttonConfig.off.entity + '/turn_off';
+            postBody.entity_id = buttonConfig.off.entity_id;
+        } else {
+            console.error( 'Unknown state: ' + body.state );
+            return;
+        }
+
+        // Build new request to update state
+        req.url    = homeAssistantApiBase + service;
+        req.method = 'POST';
+        req.body   = JSON.stringify( postBody );
+
+        // Make request to change alarm status
+        request( req, function( err, res, body ) {
+            // Handle error states
+            if ( err ) {
+                console.error( err );
+                return;
+            }
+
+            if ( 200 !== res.statusCode ) {
+                console.error( res.statusCode );
+                return;
+            }
+
+            // Nothing more to do
+            // services endpoints don't return anything useful
+            return true;
+        } );
+    } );
+}