OCNrules modification via OCN Service interface

[ewf-devops]

Original report by Christopher Burgahn (Bitbucket: [Christopher Burgahn](https://bitbucket.org/Christopher Burgahn), ).

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The idea here is that third-party service could have the right to change the OCNrules of a party. This allows that the white-&blacklist of a party is managed by a contracting service for example. As soon as a commercial agreement is made on this contracting service platform, the white-/backlist is changed accordinlgy and eRoaming via the OCN is enabled.

Two permissions must be added to the permissions list smart contract:

• 17 ocnrules_read Third-parties can read the OCNRules White/Blacklist of an OCPI Party
• 18 ocnrules_cud Third-parties can write the OCNRules White/Blacklist of an OCPI Party

The OCN Node must then allow this behaviour.

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[ewf-devops]

Original comment by John Henderson (Bitbucket: [John Henderson](https://bitbucket.org/John Henderson), GitHub: jrhender).

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Confirmed that this can be implemented using the existing permissions contract