Device Detection module

The Device Detection module helps manage the complexity of mobile environments. The module detects requests originating from mobile devices using Mobile Detect, a lightweight Java library for detecting mobile devices. Coupled with Magnolia's channels functionality, you can create channels that define the content and format served to a particular device class. There is no need to duplicate content. The same web content can be served to all devices in a format that is optimized for each device.

Installing

Maven is the easiest way to install the module. Add the following to your bundle:

<dependency>
  <groupId>info.magnolia.devdect</groupId>
  <artifactId>magnolia-module-device-detection</artifactId>
  <version>1.1</version>
</dependency>

Pre-built JARs are also available for download. See Installing a module for help.

magnolia-module-device-detection.jar

Configuration

The default configuration detects mobile devices, splitting them into two groups: smartphones and tablets. You don't need to change anything unless you want to detect other types of devices or other capabilities.

Device detection filter

DeviceDetectionFilter is registered in the Magnolia filter chain at Configuration > /server/filters/deviceDetection. The purpose of this filter is to intercept the incoming request and discover the capabilities of the device based on its User-Agent header.

Node name	Value
server
filters
context
contentType
deviceDetection
class	info.magnolia.module.devicedetection.filter.DeviceDetectionFilter
enabled	true
multipartRequest

All devices identify themselves in the User-Agent request header. Here is an example what the header looks like when an iPhone 3GS requests the Magnolia International corporate home page. The header basically says "I am an iPhone running iOS 4.0.2 and the Safari browser".

GET / HTTP/1.1
Host: www.magnolia-cms.com
Connection: close
User-Agent: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_0_2 like Mac OS X; en-us) AppleWebKit/532.9 (KHTML, like Gecko) Version/4.0.5 Mobile/8A400 Safari/6531.22.7

Device capability configuration

The Mobile Detect API provides the capabilities of mobile devices. It knows the specifications of several devices, broken down into groups. The API is built into the Device Detection module so no calls to outside services are needed during detection. Mobile Detect is a clone of Mobile ESP. We use the clone rather than the original because the clone provides a Maven artifact so we do not need to include the API code.

The API is registered in the Configuration app in /modules/device-detection/config/capability.

Node name	Value
device-detection
config
capability
class	info.magnolia.module.devicedetection.mobiledetect.MobileDetectDeviceCapability

The device detection filter asks the API if the requesting device is a smartphone or a tablet device. Once the device capabilities are identified, the filter creates a DeviceInfo object in the request and sets the following basic properties:

isSmartphone is true if the device is a smartphone.
isTablet is true if the device is a tablet.

If you want to implement your own device detection mechanism, look at these Java classes for examples.

Class	Description
DeviceDetectionModule	Implements `ModuleLifecycle` and ensures the used `DeviceCapability`'s `initCapability` method (costly) is only called only once
MobileDetectDeviceCapability	Implements DeviceCapability interface and provides information about the capabilities of the device. Gets the `DeviceInfo`
DeviceInfo	Provides information about the device. All attributes are initially set to defined defaults

Device channel configuration

In order to serve content to the device in an appropriate format, a channel is resolved next. The DeviceChannelResolver is registered in the Configuration app /server/rendering/channelManagement/channels. This resolver resolves the channel to use based on the DeviceInfo object.

Node name	Value
server
filters
IPConfig
i18n
security
rendering
channelManagement
channels
device
resolver
class	info.magnolia.module.devicedetection.DeviceChannelResolver
class	info.magnolia.channel.ChannelManagerImpl

The channel is mapped to a variation. The variation consists of templates and a theme that optimizes the content for displaying on the device.

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