llocer_ocpi

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openEV OCPI 2.2.1 implementation

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# llocer_ocpi

llocer_ocpi is a Free and Open Source librarian that allows implementation of OCPI 2.2.1 nodes.

The librarian elements can be split in two levels:
- the HTTP servlet to handle OCPI request and the HTTP request builder to send OCPI request.
- the implementation of the OCPI sender/receiver interfaces described in the specification.

See repository [llocer_ev_examples](https://github.com/Llocer/llocer_ev_examples) for usage examples.

## configuration

Optional configuration file is /etc/ocpi.conf. It must be in json format. The default is:

{
	    "public_url": "http://127.0.0.1:8080",
	    "private_uri_length": 0,
	    "pagination_limit": 100,
	    "testing_no_change_credentials": false
    }

where:

- public_url: The server public address (not including the trailing path of the OCPI servlets and query arguments)
- private_url_length : The length of the path of the server private address. Usually, if the server is not behind a loadbalancer or similar, the public and private addresses will be the same.
- pagination_limit: maximum number of items to be sent in a pagination request.
- testing_no_change_credentials: for testing only, a new token will be not generated when new credentials are received from a peer node.

Example:

Assume you public server address is "https://my.com/cso". The loadbalancer redirects the request to a private server with address "https://192.168.21.21:8080/foo/bar" and you have an OCPI servlet serving request on it at "http://192.168.21.21:8080/foo/bar/cso/ocpi/...". Configuration must be:

- "public_url": "https://my.com/cso"
- "private_url_length": 2 (number of elements in "/foo/bar")

## URL of module interfaces

Following with the same example, if the OCPI servlet is defined in web.xml as:

<servlet-mapping>
         <servlet-name>CpoOcpiServlet</servlet-name>
         <url-pattern>/ocpi/*</url-pattern>
    </servlet-mapping>

the initial versions query must be sent to:

`https://my.com/cso/ocpi`

and the endpoints query for OCPI 2.2.1 must be sent to:

`https://my.com/cso/ocpi/221`

The URL's for the OCPI modules follows the syntax:

`<public_url>/<servlet path>/<OCPI version>/<module>/<ocpi path arguments>`

by example, a location PUT to the receiver interface with countryCode=ES, partyId=PID and locationId=myLocation must use the following address:

`https://my.com/cso/ocpi/221/locations/ES/PID/myLocation`

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