Voice Interface – Home Hub REST

In a previous post we developed a simple api facility for home-hub slaves to enable remote control. The voice interface will use this api for controlling actuators, but it requires a much richer interface to provide a full interactive voice service.

The following instructions will detail how to modify your home-hub to add a full REST api. This will allow us to read data from any table or view in the hub’s database.

Our REST commands will be of the form:


Normally, the apache web server would throw a page not found error, but with some additional configuration we can direct all such requests to a specific service page.

The first step is to enable the apache rewrite module:

sudo a2enmod rewrite

Then we need to edit the configuration:

sudo nano /etc/apache2/apache2.conf

and find the document root spec:

<Directory /var/www/>
 Options Indexes FollowSymLinks
 AllowOverride None
 Require all granted

and change AllowOverride from None to All.

Restart apache…

sudo service apache2 restart

Then we can add the following .htaccess file to our document root at /var/www:

<IfModule mod_rewrite.c>
 RewriteEngine On
 RewriteBase /
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule . /rest.php [L]

and this will send any unfound page requests to rest.php

Now we can fetch the rest php script from the project repository with the following command:

wget -P /var/www/html http://www.warrensoft.co.uk/home-hub/code/website/html/rest.php

The same warning about security applies here. The rest api has no authentication built in. It provides an access-most-areas pass to inspect (but not change) all the hub’s database contents, so if your hub is internet-facing you are strongly advised to add your own security measures.

Finally we can test our rest interface:


In the next post we will setup a new Raspberry Pi in the role of Voice Assistant.

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