Provisioning server

Context

Provisioning, in the context of VoIP and other telecommunication, means providing an automated process to make a device able to connect and configure itself to be enabled to make and receive calls. This normally happens when the device is plugged and boots up, connecting to a central server that releases the needed configuration. The scope of this application is to create a simple provisioning server that is able to generate dynamically the needed configuration for every device type.

Requirements

There are two device types in the system:

• Desk: used on office desks
• Conference: used in conference rooms

When users connect these devices to the network, they should automatically get their configuration from server and be enabled to make and receive phone calls. They are different physical devices thus they are using different configuration files. What they have in common is that, when booting, they perform the following HTTP request to the server, putting their MAC address in the URL:

GET /api/v1/provisioning/aa-bb-cc-11-22-33

The server stores a table that contains all the phones in the inventory. If a phone is found in the inventory then its configuration file should be dynamically generated, according to the phone model configuration format. If a phone is not found in the inventory, the server should deny the provisioning request, returning a proper HTTP error code.

Configuration file formats

The two device types use the following configuration file formats:

Desk: Property file

username=john         # From database
password=doe          # From database
domain=sip.voverc.com # From application.properties
port=5060             # From application.properties
codecs=G711,G729,OPUS # From application.properties

Conference: JSON file

{
  "username" : "john",              // From database
  "password" : "doe",               // From database
  "domain" : "sip.voverc.com",      // From application.properties
  "port" : "5060",                  // From application.properties
  "codecs" : ["G711","G729","OPUS"] // from application.properties
}

The final configuration file should be created by taking data from database and from configuration properties contained in provisioning.* namespace in application.properties

Override fragment

In addition to standard provisioning described above, there should be the possibility to manually override final configuration file, by providing a file fragment in the database (it should be Property or JSON file) that can replace or add some configuration properties at runtime. Let's see the two cases:

Desk: Property file

username=john                # From database
password=doe                 # From database
domain=sip.anotherdomain.com # From override fragment (replaced application.properties)
port=5161                    # From override fragment (replaced application.properties)
codecs=G711,G729,OPUS        # From application.properties
timeout=10                   # From override fragment (added)

where the override fragment in the database is:

domain=sip.anotherdomain.com
port=5161
timeout=10

Conference: JSON file

{
  "username" : "john",                // From database
  "password" : "doe",                 // From database
  "domain" : "sip.anotherdomain.com", // From override fragment (replaced application.properties)
  "port" : "5161",                    // From override fragment (replaced application.properties)
  "codecs" : ["G711","G729","OPUS"],  // From application.properties
  "timeout" : 10                      // From override fragment (added)
}

where the override fragment in the database is:

{
  "domain" : "sip.anotherdomain.com",
  "port" : "5161",
  "timeout" : 10 
}

How to access database

Database is automatically recreated at startup with sample data. You can connect to H2 Console, using the following parameters:

• JDBC URL: jdbc:h2:mem:test
• User Name: sa
• Password: password

Project delivery

The final output of the project should include the following artifacts:

• Complete ProvisioningController to handle provisioning requests according to the given request format
• Complete ProvisioningServiceImpl implementation in order to support provisioning requests. Create all the necessary classes to realize the best possible implementation, considering OOP principles
• Make ProvisioningServiceImpl able to support override fragments for some devices, according to the requirements
• Tests for the implemented classes

All the code should be pushed in your public Git repository(Bitbucket, Github, etc), since you can't push branches on this repository. These are the steps:

1. You create a public fork of this project on your Bitbucket account clicking here or you clone it and push to your account if you use other Git platforms (Github, Gitlab, etc)
2. You create a dedicated branch named feature/provisioning-hw
3. You share the (public) repository link with the reviewer

Note: The system will be tested by the reviewer on the sample data by running results.sh