SOLIDPOD: migrate permission log entries to a data model

[jesscmoore]

Description

Currently, grant/revoke permission actions append a log entry string nested in json permission log. Each log entry comprises semi-colon delimited variables, from which data is obtained by splitting and numeric indexing. The log entries need to be updated to a data model class written as json to allow them to be more easily and developed to record more expressive permissions if the log entry were instead written as a json data model.

From createPermLogEntry():

final logEntryId = DateFormat('yyyyMMddTHHmmssSSS').format(DateTime.now());
  final logEntryStr =
      '$dateTimeStr;$resourceUrl;$ownerWebId;$permissionType;$granterWebId;$recipientWebId;${permissionListStr.toLowerCase()}';

  logEntry = LogEntry(id: logEntryId, record: logEntryStr);

Why

So that as a developer I can access data from the log entries more easily, and develop more features. Eg record other more expressive permissions, or create a searchable permission log history.

Closing Criteria

Checklist for closing the issue:

• No errors from make prep
• All tests pass make qtest
• Each permission log entry is written as json and parsed into a data model.
• Identifies permission logs in the old format, and converts them to the new format.

[jesscmoore]

@anushkavidanage permission log entries are currently written as a semicolon delimited string nested in json. In order to make permission log more easily read into a data model and reduce complexity, I would like to change

final logEntryStr =
   '$dateTimeStr;$resourceUrl;$ownerWebId;$permissionType;$granterWebId;$recipientWebId;${permissionListStr.toLowerCase()}';

to a nested json map. This would require a method to convert any logs in the old format to new format. I was planning to do this as a dart function, which the user is recommended to run in a dialog if the app detects permission log entries in the semi colon format. Let me know if you have a better suggestion or anticipate problems.

[gjwgit]

This is a question for @anusii/anusii