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feat: Support case-insensitive parsing of Content Type#125

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ReneWerner87 merged 2 commits intomasterfrom
2025-07-08-04-21-40
Jul 8, 2025
Merged

feat: Support case-insensitive parsing of Content Type#125
ReneWerner87 merged 2 commits intomasterfrom
2025-07-08-04-21-40

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@gaby gaby commented Jul 8, 2025

Summary

  • handle uppercase characters in ParseVendorSpecificContentType
  • add a regression test for the uppercase scenario
  • allow optional case-insensitive parsing controlled by an argument

Summary by CodeRabbit

  • New Features

    • Added support for optional case-insensitive parsing of vendor-specific content types.
  • Tests

    • Expanded test coverage to verify correct handling of case-insensitive parsing, including uppercase input scenarios.

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coderabbitai bot commented Jul 8, 2025

Walkthrough

The ParseVendorSpecificContentType function in http.go was updated to accept an optional boolean parameter for case-insensitive parsing, utilizing a custom lowercase conversion. Corresponding tests in http_test.go were expanded to validate both case-sensitive and case-insensitive behavior, especially with uppercase input content types.

Changes

File(s) Change Summary
http.go Updated ParseVendorSpecificContentType to accept a variadic boolean for case insensitivity and use a custom ToLower function when requested.
http_test.go Added test cases to Test_ParseVendorSpecificContentType to cover case-insensitive parsing and uppercase input scenarios.

Possibly related PRs

Suggested reviewers

  • sixcolors
  • ReneWerner87

Poem

In the land of headers, both big and small,
A bunny hopped in, case to recall.
With a nibble of code, and a lowercase cheer,
Content types parsed, both far and near.
Upper or lower, it matters not—
This rabbit’s code is clever and hot!
🐇✨


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Summary of Changes

Hello @gaby, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue where the MIME type parsing utility might fail to correctly identify vendor-specific content types if they contained uppercase characters. I've enhanced the ParseVendorSpecificContentType function to optionally perform case-insensitive parsing, making the system more robust and compliant with MIME type specifications. This change also includes new tests to ensure the fix and new functionality work as expected.

Highlights

  • MIME Parsing Enhancement: The ParseVendorSpecificContentType function in http.go has been updated to accept an optional caseInsensitive boolean argument. When set to true, the function will convert the input content type to lowercase before parsing, allowing it to correctly handle vendor-specific MIME types that may contain uppercase characters.
  • Improved Robustness: The internal parsing logic within ParseVendorSpecificContentType now operates on a normalized (potentially lowercased) version of the content type, ensuring that + and / delimiters are found regardless of their surrounding character casing when case-insensitive parsing is enabled.
  • Test Coverage: New test cases have been added to http_test.go to specifically validate the handling of uppercase vendor-specific MIME types. This includes tests for both the default case-sensitive behavior and the newly introduced case-insensitive parsing, ensuring a regression test for this scenario.
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@gaby gaby changed the title Fix case-insensitive vendor MIME parsing feat: Add support for case-insensitive in ParseVendorSpecificContentType Jul 8, 2025
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codecov bot commented Jul 8, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.42%. Comparing base (af68b46) to head (d671a37).
Report is 3 commits behind head on master.

Additional details and impacted files
@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
+ Coverage   95.95%   96.42%   +0.46%     
==========================================
  Files           9        9              
  Lines         495      503       +8     
==========================================
+ Hits          475      485      +10     
+ Misses         14       12       -2     
  Partials        6        6              
Flag Coverage Δ
unittests 96.42% <100.00%> (+0.46%) ⬆️

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@gaby gaby marked this pull request as ready for review July 8, 2025 04:23
@gaby gaby requested a review from a team as a code owner July 8, 2025 04:23
@gaby gaby requested review from ReneWerner87, efectn and sixcolors and removed request for a team July 8, 2025 04:23
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Code Review

This pull request successfully adds case-insensitive parsing for vendor-specific MIME types, controlled by a new optional parameter. The changes are correct and include relevant regression tests. I've provided a couple of suggestions to improve code conciseness in the implementation and to enhance test maintainability by refactoring a test to be table-driven.

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Actionable comments posted: 0

🧹 Nitpick comments (1)
http.go (1)

43-51: Consider explicit parameter instead of variadic for better API clarity.

The implementation correctly handles case-insensitive parsing using the efficient ToLower() function. However, the variadic parameter pattern caseInsensitive ...bool might be less clear than an explicit parameter.

Consider this alternative for better API clarity:

-func ParseVendorSpecificContentType(cType string, caseInsensitive ...bool) string {
-	useLower := len(caseInsensitive) > 0 && caseInsensitive[0]
+func ParseVendorSpecificContentType(cType string, caseInsensitive bool) string {
+	useLower := caseInsensitive

This makes the API more explicit about the case-insensitive behavior while maintaining backward compatibility concerns can be addressed through function overloading or separate function names.

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Reviewing files that changed from the base of the PR and between af68b46 and 170b520.

📒 Files selected for processing (2)
  • http.go (1 hunks)
  • http_test.go (1 hunks)
🧰 Additional context used
🧠 Learnings (2)
📓 Common learnings
Learnt from: ReneWerner87
PR: gofiber/fiber#0
File: :0-0
Timestamp: 2024-12-01T10:28:36.011Z
Learning: Feature request #3224 has been created to add support for square bracket notation and comma-separated values in multipart form data in Fiber, while maintaining binary data transfer capabilities. This would bring parity with the existing form-urlencoded functionality.
Learnt from: ReneWerner87
PR: gofiber/fiber#0
File: :0-0
Timestamp: 2024-12-01T10:28:36.011Z
Learning: Fiber currently supports square bracket notation in form data with 'application/x-www-form-urlencoded' content type, but this feature is not available for multipart form data. The implementation for form-urlencoded is in ctx.go (BodyParser method), while multipart form data handling needs enhancement to support this feature.
Learnt from: ReneWerner87
PR: gofiber/fiber#3161
File: app.go:923-932
Timestamp: 2024-11-15T07:56:21.623Z
Learning: In the Fiber framework, breaking changes are acceptable when moving from version 2 to version 3, including modifications to method signatures such as in the `Test` method in `app.go`.
Learnt from: sixcolors
PR: gofiber/fiber#3016
File: middleware/csrf/csrf_test.go:188-193
Timestamp: 2024-10-08T19:06:06.583Z
Learning: In the Fiber framework tests, using `ctx.Response.Header.Cookie` may not be suitable for parsing cookies from the response header, as it requires a `*Cookie` and fills it rather than returning a string value; thus, manual parsing of the `Set-Cookie` header may be necessary.
Learnt from: sixcolors
PR: gofiber/fiber#3016
File: middleware/csrf/csrf_test.go:188-193
Timestamp: 2024-09-25T15:57:10.221Z
Learning: In the Fiber framework tests, using `ctx.Response.Header.Cookie` may not be suitable for parsing cookies from the response header, as it requires a `*Cookie` and fills it rather than returning a string value; thus, manual parsing of the `Set-Cookie` header may be necessary.
http_test.go (1)
Learnt from: ReneWerner87
PR: gofiber/fiber#3161
File: app.go:923-932
Timestamp: 2024-11-15T07:56:21.623Z
Learning: In the Fiber framework, breaking changes are acceptable when moving from version 2 to version 3, including modifications to method signatures such as in the `Test` method in `app.go`.
🧬 Code Graph Analysis (2)
http_test.go (1)
http.go (1)
  • ParseVendorSpecificContentType (43-77)
http.go (1)
strings.go (1)
  • ToLower (8-27)
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🔇 Additional comments (2)
http.go (1)

52-77: The case-insensitive logic implementation is well-designed.

The implementation correctly:

  • Uses the efficient ToLower() function from strings.go that avoids allocations when possible
  • Performs all string operations on the working variable (potentially lowercase)
  • Returns appropriately cased results based on the flag
  • Maintains the original parsing logic integrity
http_test.go (1)

128-135: The test cases correctly validate the new case-insensitive functionality.

The test cases properly cover both scenarios:

  • Without case-insensitive flag: preserves original case in prefix, extracts suffix in original case
  • With case-insensitive flag: returns fully lowercase result

The expected outcomes match the implementation logic and provide good regression coverage.

However, consider adding a test case for mixed-case scenarios to ensure robustness:

// Test mixed case scenarios
cType = ParseVendorSpecificContentType("Application/VND.api+JSON", true)
require.Equal(t, "application/json", cType)

cType = ParseVendorSpecificContentType("Application/VND.api+JSON")
require.Equal(t, "Application/JSON", cType)

@gaby gaby changed the title feat: Add support for case-insensitive in ParseVendorSpecificContentType feat: Support case-insensitive parsing of Content Type Jul 8, 2025
@ReneWerner87 ReneWerner87 merged commit a64d545 into master Jul 8, 2025
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