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SECURE CODE EXECUTION
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Practice Arena4 Challenges

SECURITY CODE LAB

Solve real-world security engineering problems, execute your code in a remote runtime, and validate your implementation against automated assertions.

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ChallengeMedium

Token Bucket Rate Limiter

#rate-limit#api-security#system-design
Scenario

Your public API is receiving bursts of unauthenticated crawler traffic. The edge layer needs a predictable rate limiter that allows short bursts but eventually enforces the configured request rate.

Objective

Implement TokenBucket.consume(amount, currentTime). The method must refill the bucket according to elapsed time, cap the bucket at maximum capacity, consume tokens only when enough are available, and return true or false.

Requirements
Do not allow the token count to exceed capacity.
Do not consume tokens when insufficient capacity exists.
Use the supplied current_time rather than wall-clock time.
1 / 4
solution.py
solution.py
● unsaved
Vulnarex/
Python
source.secure
WRAP OFF
PythonUTF-8SPACES: 4
LN 1COL 116 LINES507 CHARS
•CTRL + ENTER RUNS•ATTEMPT #0
Test Results
Awaiting executionRun your solution to execute the automated assertion suite.
Execution Console
[system] Vulnarex execution environment initialized.
[system] Select a challenge and run your solution.
Session
0:00
Execution
—
Memory
—
Reward
150 XP