lser-Agent classification using TheWeatherChannel's dClass and OpenDDR
======================================================================
An implementation of the user agent classification library [dClass by TheWeatherChannel](https://github.com/TheWeatherChannel/dClass) using an Erlang NIF.
## Device Classification
The main interface is `ua_classifier:classify/1`. It returns a property list with user agent properties from OpenDDR.
```erlang
{ok, Ps} = ua_classifier:classify("Mozilla/5.0 (iPod; U; CPU iPhone OS 4_0 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A293 Safari/6531.22.7").
```
Returns:
```erlang
{ok,[{is_wireless_device,true},
{is_tablet,false},
{ajax_support_javascript,true},
{device_os,<<"iPhone OS">>},
{displayWidth,320},
{displayHeight,480},
{inputDevices,<<"touchscreen">>},
{parentId,<<"genericApple">>},
{model,<<"iPod Touch">>},
{vendor,<<"Apple">>},
{id, <<"iPod">>]}
```
This property list can be mapped to a device type with `ua_classifier:device_type/1`.
Known device types are: `text`, `phone`, `tablet` and `desktop`.
```erlang
ua_classifier:device_type(Ps).
```
Returns:
```erlang
phone
```
## Browser Classification
Another interface is `ua_classifier:browser_classify/1`. Instead of returning the device classification of the
user-agent it returns the browser classification.
```erlang
ua_classifier:browser_classify("Mozilla/5.0 (iPod; U; CPU iPhone OS 4_0 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A293 Safari/6531.22.7").
```
Returns:
```erlang
{ok, [{os, <<"iOS">>},
{browser, <<"Safari">>},
{version, 4050},
{id, <<"iossafari405">>}
]}
```
The OpenDDR data files
----------------------
This library uses the ".dtree" file of dClass. They are placed in `priv/openddr.dtree` and `priv/browser.dtree`.
The dtree files are loaded when the NIF is initialized and when the NIF is upgraded.