Fix boundary extraction from Content-Type with additional parameters - #21073
Fix boundary extraction from Content-Type with additional parameters#21073iliaal wants to merge 2 commits into
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The greedy pattern boundary="?(.*)"?$ captured everything up to the end
of the header, so a header like
multipart/form-data; boundary=ABC; charset=utf-8
extracted the boundary 'ABC; charset=utf-8' and parsing returned no
parts. Match either a quoted boundary string or an unquoted token that
ends at the next parameter separator or whitespace instead, and bail
out on an empty boundary.
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📜 Recent review details🧰 Additional context used🪛 PHPMD (2.15.0)tests/framework/web/MultipartFormDataParserTest.php[warning] 14-276: The class MultipartFormDataParserTest has 11 public methods. Consider refactoring MultipartFormDataParserTest to keep number of public methods under 10. (undefined) (TooManyPublicMethods) framework/web/MultipartFormDataParser.php[warning] 66-461: The class MultipartFormDataParser has an overall complexity of 82 which is very high. The configured complexity threshold is 50. (undefined) (ExcessiveClassComplexity) [error] 66-461: The property $_uploadFileMaxSize is not named in camelCase. (undefined) (CamelCasePropertyName) [error] 66-461: The property $_uploadFileMaxCount is not named in camelCase. (undefined) (CamelCasePropertyName) [error] 130-211: Remove error control operator '@' on line 191. (undefined) (ErrorControlOperator) [warning] 130-211: The method parse() has a Cyclomatic Complexity of 15. The configured cyclomatic complexity threshold is 10. (undefined) (CyclomaticComplexity) [warning] 130-211: The method parse() has an NPath complexity of 888. The configured NPath complexity threshold is 200. (undefined) (NPathComplexity) [error] 130-211: parse accesses the super-global variable $_POST. (undefined) (Superglobals) [error] 130-211: parse accesses the super-global variable $_FILES. (undefined) (Superglobals) [warning] 222-300: The method getMimeParameter() has a Cyclomatic Complexity of 31. The configured cyclomatic complexity threshold is 10. (undefined) (CyclomaticComplexity) [warning] 222-300: The method getMimeParameter() has an NPath complexity of 106497. The configured NPath complexity threshold is 200. (undefined) (NPathComplexity) [warning] 226-226: Avoid variables with short names like $i. Configured minimum length is 3. (undefined) (ShortVariable) [error] 286-292: The method getMimeParameter uses an else expression. Else clauses are basically not necessary and you can simplify the code by not using them. (undefined) (ElseExpression) 🔇 Additional comments (3)
📝 WalkthroughSummary by CodeRabbit
WalkthroughChangesMultipart boundary handling
Poem
Merge Risk: ⚪ Minimal · up to The boundary parsing fix is localized, and no actionable merge-blocking risk remains beyond normal checks and review. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 2 files. (1 skipped: 1 unsupported.)
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Inline comments:
In `@framework/web/MultipartFormDataParser.php`:
- Around line 145-152: Update the boundary-matching regex in the
MultipartFormDataParser parsing flow to recognize boundary= only at the start of
the Content-Type header or immediately after a semicolon, preventing matches
inside unrelated parameter names or quoted values. Preserve the existing
empty-boundary checks and return [] when no valid boundary parameter is present.
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framework/web/MultipartFormDataParser.phptests/framework/web/MultipartFormDataParserTest.php
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🧰 Additional context used
🪛 PHPMD (2.15.0)
framework/web/MultipartFormDataParser.php
[warning] 66-376: The class MultipartFormDataParser has an overall complexity of 53 which is very high. The configured complexity threshold is 50. (undefined)
(ExcessiveClassComplexity)
[error] 66-376: The property $_uploadFileMaxSize is not named in camelCase. (undefined)
(CamelCasePropertyName)
[error] 66-376: The property $_uploadFileMaxCount is not named in camelCase. (undefined)
(CamelCasePropertyName)
[error] 130-215: Remove error control operator '@' on line 195. (undefined)
(ErrorControlOperator)
[warning] 130-215: The method parse() has a Cyclomatic Complexity of 17. The configured cyclomatic complexity threshold is 10. (undefined)
(CyclomaticComplexity)
[warning] 130-215: The method parse() has an NPath complexity of 2368. The configured NPath complexity threshold is 200. (undefined)
(NPathComplexity)
[error] 130-215: parse accesses the super-global variable $_POST. (undefined)
(Superglobals)
[error] 130-215: parse accesses the super-global variable $_FILES. (undefined)
(Superglobals)
tests/framework/web/MultipartFormDataParserTest.php
[warning] 14-270: The class MultipartFormDataParserTest has 11 public methods. Consider refactoring MultipartFormDataParserTest to keep number of public methods under 10. (undefined)
(TooManyPublicMethods)
🔇 Additional comments (1)
tests/framework/web/MultipartFormDataParserTest.php (1)
16-33: LGTM!Also applies to: 35-41
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #21073 +/- ##
============================================
- Coverage 80.69% 80.68% -0.02%
- Complexity 11552 11584 +32
============================================
Files 374 374
Lines 30280 30331 +51
============================================
+ Hits 24435 24472 +37
- Misses 5845 5859 +14 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Thanks for the fix. Additionally, please add the corresponding entry to framework/CHANGELOG.md.
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Please address the following correctness issues before approval.
Empty quoted boundary (`boundary=""`) left $matches[2] unset and became a PHP warning. The substring match also picked `boundary=` inside other parameter names and quoted values. Split parameters only outside quoted-strings, reject an empty boundary, and cover those cases in tests.
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Added under 2.0.56. |
3 participants
Motivation
MultipartFormDataParser::parse()extracts the boundary with a greedy pattern:For a header like
multipart/form-data; boundary=ABC; charset=utf-8it capturesABC; charset=utf-8as the boundary,preg_splitfinds no delimiters and parsing returns no parts — real-world servers and clients do append additional Content-Type parameters. Quoted boundaries with trailing parameters (boundary="ABC"; charset=utf-8) fail the same way.Changes
Match either a quoted boundary string or an unquoted token terminated by the next parameter separator or whitespace (per the MIME parameter syntax), and bail out on an empty boundary:
Existing behavior for plain and quoted boundaries without trailing parameters is unchanged.
Tests
New cases in
tests/framework/web/MultipartFormDataParserTest.php: boundary followed by; charset=utf-8(unquoted and quoted forms) parses all parts; missing/empty boundary returns no parts.