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Merged
npaun merged 1 commit into from
Nov 2, 2026
Merged

Add WPT mimesniff/mime-types test #8131

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6 changes: 6 additions & 0 deletions src/wpt/BUILD.bazel
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Original file line number Diff line number Diff line change
Expand Up @@ -287,3 +287,9 @@ wpt_test(
config = "console-test.ts",
wpt_directory = "@wpt//:console@module",
)

wpt_test(
name = "mimesniff/mime-types",
config = "mimesniff/mime-types-test.ts",
wpt_directory = "@wpt//:mimesniff/mime-types@module",
)
116 changes: 116 additions & 0 deletions src/wpt/mimesniff/mime-types-test.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,116 @@
// Copyright (c) 2017-2026 Cloudflare, Inc.
// Licensed under the Apache 2.0 license found in the LICENSE file or at:
// https://opensource.org/licenses/Apache-2.0

import { type TestRunnerConfig } from 'harness/harness';

export default {
'charset-parameter.window.js': {
comment:
'Loads each MIME type into an iframe and reads document.characterSet; workerd has no iframes or documents',
omittedTests: true,
},
'parsing.any.js': {
comment:
'Blob/File: the test expects new Blob({type}).type to be the parsed and serialized MIME type, ' +
'but the File API spec (and workerd, src/workerd/api/blob.c++ normalizeType) only lowercases ' +
'printable-ASCII types and discards others, without MIME parsing. Browsers fail most of these ' +
'too. The regexes cover the generated-mime-types.json families that fail for every listed ' +
'code point (or for the ranges given); the strings are the failing mime-types.json cases. ' +
'Request/Response: see the comment on each group below.',
expectedFailures: [
// Blob/File, generated-mime-types.json: "<c>/x" and "x/<c>" for printable non-token
// code points. Control and non-ASCII code points pass because both sides give "".
// U+007F would pass too if normalizeType discarded it as the File API spec requires.
/^[ "(),:-@[\]\\{}\x7F]\/x \(Blob\/File\)$/,
/^x\/[ "(),:-@[\]\\{}\x7F] \(Blob\/File\)$/,
// Blob/File, generated-mime-types.json: "x/x;<c>=x;bonus=x" and "x/x;x=<c>;bonus=x"
// only exist for code points that make the parameter invalid, and all of them fail.
/^x\/x;[\s\S]=x;bonus=x \(Blob\/File\)$/,
/^x\/x;x=[\s\S];bonus=x \(Blob\/File\)$/,
// Blob/File, generated-mime-types.json: quoted parameter values containing control or
// non-ASCII code points.
/^x\/x;x="[^ -~]";bonus=x \(Blob\/File\)$/,
// Blob/File, mime-types.json.
'TEXT/HTML;CHARSET=GBK (Blob/File)',
'text/html;charset=gbk( (Blob/File)',
'text/html;x=(;charset=gbk (Blob/File)',
'text/html;charset=gbk;charset=windows-1255 (Blob/File)',
'text/html;charset=();charset=GBK (Blob/File)',
'text/html;charset =gbk (Blob/File)',
'text/html ;charset=gbk (Blob/File)',
'text/html; charset=gbk (Blob/File)',
'text/html;charset= gbk (Blob/File)',
'text/html;charset= "gbk" (Blob/File)',
'text/html;charset=\x0Bgbk (Blob/File)',
'text/html;charset=\x0Cgbk (Blob/File)',
'text/html;\x0Bcharset=gbk (Blob/File)',
'text/html;\x0Ccharset=gbk (Blob/File)',
"text/html;charset=';charset=GBK (Blob/File)",
'text/html;test;charset=gbk (Blob/File)',
'text/html;test=;charset=gbk (Blob/File)',
"text/html;';charset=gbk (Blob/File)",
'text/html;";charset=gbk (Blob/File)',
'text/html ; ; charset=gbk (Blob/File)',
'text/html;;;;charset=gbk (Blob/File)',
'text/html;charset= "\x7F;charset=GBK (Blob/File)',
'text/html;charset="\x7F;charset=foo";charset=GBK (Blob/File)',
'text/html;charset="gbk" (Blob/File)',
'text/html;charset="gbk (Blob/File)',
'text/html;charset=gbk" (Blob/File)',
'text/html;charset="\\ gbk" (Blob/File)',
'text/html;charset="\\g\\b\\k" (Blob/File)',
'text/html;charset="gbk"x (Blob/File)',
'text/html;charset="";charset=GBK (Blob/File)',
'text/html;charset=";charset=GBK (Blob/File)',
'text/html;charset={gbk} (Blob/File)',
'text/html;a]=bar;b[=bar;c=bar (Blob/File)',
'text/html;in]valid=";asd=foo";foo=bar (Blob/File)',
"!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz;!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz=!#$%&'*+-.^_`|~0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz (Blob/File)",
'x/x;x="\t !\\"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8A\x8B\x8C\x8D\x8E\x8F\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9A\x9B\x9C\x9D\x9E\x9F\xA0¡¢£¤¥¦§¨©ª«¬\xAD®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ" (Blob/File)',
'x/x;test (Blob/File)',
'x/x;test="\\ (Blob/File)',
'x/x;x= (Blob/File)',
'x/x;x=\t (Blob/File)',
'x/x\n\r\t ;x=x (Blob/File)',
'\n\r\t x/x;x=x\n\r\t (Blob/File)',
'x/x;\n\r\t x=x\n\r\t ;x=y (Blob/File)',
'text/html;test=ÿ;charset=gbk (Blob/File)',
'x/x;test=\uFFFD;x=x (Blob/File)',
'/ (Blob/File)',
'bogus (Blob/File)',
'bogus/ (Blob/File)',
'bogus/ (Blob/File)',
'bogus/bogus/; (Blob/File)',
'</> (Blob/File)',
'(/) (Blob/File)',
'text/html(;doesnot=matter (Blob/File)',
'{/} (Blob/File)',
'text /html (Blob/File)',
'text/ html (Blob/File)',
'"text/html" (Blob/File)',

// Request/Response: workerd's MIME parser treats '\' as an HTTP token code point
// (token_table in src/workerd/util/mimetype.c++), so it accepts '\' in types, subtypes
// and parameter names, and serializes a '\' parameter value without quoting it.
'x/x;test="\\ (Request/Response)',
'\\/x (Request/Response)',
'x/\\ (Request/Response)',
'x/x;\\=x;bonus=x (Request/Response)',
// Request/Response: when a parameter name is invalid, workerd's MIME parser skips to
// the next ';' instead of first collecting the quoted-string value, so a ';' inside the
// quotes starts a new parameter (src/workerd/util/mimetype.c++, MimeType::tryParse).
'text/html;in]valid=";asd=foo";foo=bar (Request/Response)',
// Request/Response: Body.blob() uses Fetch's "extract a MIME type", which splits the
// Content-Type value on commas outside quoted strings. The test expects the whole value
// to be parsed as one MIME type. workerd follows Fetch here.
'x/x;,=x;bonus=x (Request/Response)',
'x/x;x=,;bonus=x (Request/Response)',
// Request/Response: workerd deliberately accepts header values with code points above
// U+00FF (encoding them as UTF-8 and logging a warning) instead of throwing a TypeError
// (src/workerd/api/headers.c++, maybeWarnIfBadHeaderString).
'x/x;test=\uFFFD;x=x (Request/Response)',
'Ā/Ā (Request/Response)',
],
},
} satisfies TestRunnerConfig;
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