better errors

[obsd]

No description provided.

[linear]

PER-348 Change SDKs to throw when no connection to PDP

@Oded the following changes are needed in this ticket:

• for each SDK in [Node.js, python, C#, Java]:
  • make sure the enforcer's permit.check() method throws a PermitConnectionError when there is no connection to the PDP, that can actually be true to all api methods
  • change the instructions in the backend to include the pseudocode:

try {
    if (permitted) {
        res.status(200).send(${user.firstName} ${user.lastName} is PERMITTED to read article!);
    } else {
        res.status(403).send(${user.firstName} ${user.lastName} is NOT PERMITTED to read article!);
} catch PermitConnectionError {
        // No connection to Permit.io PDP, did you run the container?
        res.status(403).send("No connection to Permit.io PDP, did you run the container?")
}

These changes will result in 5 pull requests:

• Node.js SDK changes
• python SDK changes
• Java SDK changes
• C# SDK changes
• backend install instruction changes (for all 4 languages)

-----

We should change the if code to support 3 cases - res.status(200), status(403), and NULL

This way, we will be able to guide the users that the connection wasn't received and keep the change locally

What Oded and myself got to:
try {
if (permitted && res && res.status(200)) {
res.status(200).send(${user.firstName} ${user.lastName} is PERMITTED to read article!);
} else if (res && res.status(403)) {
res.status(403).send(${user.firstName} ${user.lastName} is NOT PERMITTED to read article!);
}
} catch {
res.send(received nothing);
}