• docs/api/middleware/csrf.md (3 hunks)
• middleware/csrf/csrf.go (9 hunks)
• middleware/csrf/csrf_test.go (5 hunks)
• middleware/csrf/helpers.go (2 hunks)
• middleware/csrf/helpers_test.go (1 hunks)

middleware/csrf/helpers.go (1)

• 17-48: Consider adding more detailed comments within the normalizeOrigin function to explain the rationale behind each validation check. This will improve maintainability and understanding for future contributors.

middleware/csrf/helpers_test.go (1)

• 115-130: The benchmark test for subdomain.match is well-implemented and provides valuable insights into the method's performance. It's a good practice to assess the performance impact of changes, such as making the matching case-insensitive.

middleware/csrf/csrf.go (2)

• 28-28: Changing the config field in the Handler struct from a pointer to a value type is a good practice, as it ensures the configuration's immutability once the handler is created. This prevents accidental modifications and enhances safety.
• 60-81: The updates to the initialization of trustedOrigins and trustedSubOrigins to support wildcard subdomain matching are well-implemented. This enhancement significantly improves the flexibility and security of the CSRF middleware by allowing more granular control over trusted origins.

docs/api/middleware/csrf.md (3)

• 119-119: The documentation update to specify the use of wildcard characters (e.g., https://*.example.com) for subdomain matching in the TrustedOrigins configuration is clear and correctly reflects the new functionality. This change allows for a more flexible and convenient way to specify trusted origins, especially for applications that operate across multiple subdomains.
• 159-159: The explanation of the TrustedOrigins option and its support for matching subdomains at any level is well-documented. The inclusion of an example using "https://*.example.com" to allow any subdomain of example.com to submit requests enhances the clarity of this feature. This section effectively communicates the new capability and its potential use cases.
• 182-182: The caution note regarding the use of TrustedOrigins with subdomain matching is an important inclusion. It rightly emphasizes the security considerations that users must be aware of when configuring trusted origins with wildcard subdomains. This helps ensure that users understand the implications and use the feature securely.

middleware/csrf/csrf_test.go (1)

• 999-1010: The logic for deleting the CSRF token and removing the cookie in Test_CSRF_DeleteToken is a valuable addition. It's important to ensure that the CSRF protection mechanism can handle token deletion securely and correctly. This test case helps verify that behavior. However, consider adding a comment explaining the purpose of deleting all cookies in line 1005 and its relevance to CSRF protection, as it might not be immediately clear to future maintainers.

• middleware/csrf/csrf.go (8 hunks)
• middleware/csrf/csrf_test.go (5 hunks)

middleware/csrf/csrf.go (2)

• 27-27: The change from a pointer to a value type for the config field in the Handler struct is a significant alteration. This change ensures that the config is not nil, potentially improving the safety and reliability of the middleware. However, it's important to consider the impact on memory usage, especially if the Config struct is large or contains many fields. In most cases, the benefits of avoiding nil pointer dereferences outweigh the slight increase in memory usage.
• 117-122: The implementation of origin and referer matching functions to handle subdomains is a key enhancement. It correctly enforces origin checks for unsafe requests and falls back to referer checks for HTTPS connections when the origin is not available. This approach aligns with security best practices by prioritizing the Origin header over the Referer header due to the latter's less reliable nature. The logic appears sound and well-integrated with the existing CSRF protection mechanisms.

• docs/api/middleware/csrf.md (3 hunks)
• middleware/csrf/csrf_test.go (7 hunks)
• middleware/csrf/helpers_test.go (1 hunks)

• middleware/csrf/csrf_test.go
• middleware/csrf/helpers_test.go

docs/api/middleware/csrf.md (3)

• 119-119: The update to the TrustedOrigins configuration description to include wildcard subdomain matching (https://*.example.com) is clear and accurately reflects the new functionality. This change enhances the flexibility and usability of the CSRF middleware by allowing developers to specify a range of trusted subdomains in a concise manner.
• 159-161: The explanation of the TrustedOrigins option and its ability to match subdomains at any level is well-detailed and informative. It correctly emphasizes the utility of the feature in allowing requests from any subdomain of a specified domain, enhancing the middleware's flexibility for applications with multiple subdomains.
• 183-185: The caution note regarding the use of TrustedOrigins with subdomain matching is crucial for security. It rightly warns users to ensure control and trust over all subdomains, including all subdomain levels, to prevent potential misuse by attackers. This is an important security consideration that helps guide users in safely utilizing the new feature.

• middleware/csrf/csrf_test.go (11 hunks)

middleware/csrf/csrf_test.go (7)

• 758-759: The addition of wildcard domain support in Test_CSRF_TrustedOrigins is a significant enhancement. It's crucial to ensure that the implementation correctly handles various subdomain patterns and edge cases. Consider adding more comprehensive tests to cover scenarios such as deeply nested subdomains (e.g., https://a.b.c.domain-1.com) and subdomains with special characters or hyphens to ensure robustness.
• 892-892: The Test_CSRF_TrustedOrigins_InvalidOrigins test function correctly identifies invalid origin formats. However, it's recommended to call t.Parallel() at the beginning of each subtest to allow parallel execution and improve test suite performance. This change can significantly reduce the overall test execution time, especially as the number of tests grows.
• 1030-1041: Adding logic for deleting the CSRF token and removing the cookie in Test_CSRF_DeleteToken is a good practice to ensure the middleware behaves correctly in scenarios where the token needs to be invalidated. This addition enhances the test coverage for token management within the CSRF middleware.
• 1343-1369: > 📝 NOTE

This review was outside the diff hunks and was mapped to the diff hunk with the greatest overlap. Original lines [1333-1366]

The benchmark test Benchmark_Middleware_CSRF_Check is well-structured and provides a good measure of the middleware's performance under load. However, ensure that the CSRF token generation and validation logic are optimized to minimize performance overhead, especially in high-traffic applications.

• 1387-1391: The benchmark test Benchmark_Middleware_CSRF_GenerateToken focuses on measuring the performance of CSRF token generation. It's important to ensure that the token generation process is both secure and efficient, as it directly impacts the user experience and the application's security posture.
• 1392-1392: The test Test_CSRF_InvalidURLHeaders is crucial for ensuring that the CSRF middleware correctly handles invalid Origin and Referer headers, preventing potential security vulnerabilities. It's good practice to include such tests to cover edge cases and malformed inputs.
• 1393-1393: The tests Test_CSRF_TokenFromContext, Test_CSRF_FromContextMethods, and Test_CSRF_FromContextMethods_Invalid are valuable for verifying the utility functions related to CSRF token management within the application context. These tests ensure that the middleware's API is reliable and behaves as expected in various scenarios.