P3: Bucket Policy implementation complete
- BucketPolicy struct with Version + Statement array
- PolicyStatement: Effect, Principal, Action, Resource, Condition
- Principal matching (wildcard + user-specific)
- Action/Resource pattern matching with wildcards
- GetBucketPolicy: GET /s3/policy/:bucket
- PutBucketPolicy: PUT /s3/policy/:bucket
- DeleteBucketPolicy: DELETE /s3/policy/:bucket
- Policy persistence to data/s3_policies/:bucket/policy.json
- check_bucket_policy() for authorization
- 6 unit tests
Tests: 299 passed, 0 failed
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