[Solved] A microservice uses this RBAC check: def check_access(role, permission): role_permissions = { "editor": ["read", "write"], "viewer":... | Microservices

Microservices - Authentication and Authorization

A microservice uses this RBAC check:

def check_access(role, permission):
    role_permissions = {
        "editor": ["read", "write"],
        "viewer": ["read"]
    }
    return permission in role_permissions[role]

print(check_access("admin", "write"))

What is the problem and how to fix it?

AKeyError occurs; fix by using role_permissions.get(role, [])

BSyntaxError due to missing colon; add colon after function

CReturns False incorrectly; add "admin" role to dictionary

DReturns True incorrectly; remove "write" from editor permissions

Step-by-Step Solution

Solution:

Step 1: Identify error cause
Accessing role_permissions["admin"] causes KeyError because "admin" key is missing.
Step 2: Fix by safe dictionary access
Use role_permissions.get(role, []) to return empty list if role missing, avoiding error.
Final Answer:
KeyError occurs; fix by using role_permissions.get(role, []) -> Option A
Quick Check:
Missing key causes KeyError; get() avoids it [OK]

Quick Trick: Use get() to avoid KeyError on missing roles [OK]

Common Mistakes:

MISTAKES

Adding roles without permissions
Confusing syntax errors with runtime errors
Ignoring missing key errors

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A microservice uses this RBAC check:

Step 1: Identify error cause

Step 2: Fix by safe dictionary access

Final Answer:

Quick Check:

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