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Improve implicit FormData detection. Add tests. #1539

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Improve implicit FormData detection. Add tests. #1539

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4a39905
Improve implicit form data detection. Add tests.
aphofstede Dec 2, 2025
54adc23
Merge branch 'main' into fix/1538-content-type-detection
aphofstede Feb 26, 2026
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12 changes: 9 additions & 3 deletions src/schema-routes/schema-routes.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -579,9 +579,15 @@ export class SchemaRoutes {
// It needed for cases when swagger schema is not declared request body type as form data
// but request body data type contains form data types like File
if (
this.FORM_DATA_TYPES.some((dataType) =>
content.includes(`: ${dataType}`),
)
this.FORM_DATA_TYPES.some((dataType) => {
// Match e.g. ": File" followed by word boundary, array brackets, or union/nullable syntax
// This prevents false positives like ": FileType" or ": SomeFile"
// Escape special regex characters (getSchemaType can theoretically return complex types like "File | null" or "UtilRequiredKeys<File, ...>")
const escapedType = dataType.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
return new RegExp(`:\\s*${escapedType}(?:\\[\\]|\\s*\\||\\b|$)`).test(
content,
);
Comment on lines +583 to +589
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Copilot AI Feb 26, 2026

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The regex only matches : File followed by []/|/word-boundary, but it won’t match array types produced as : (File)[] (or : (File | null)[]) because of the leading (. If request bodies can contain arrays of file/binary, the workaround will miss them and keep contentKind as JSON. Consider allowing optional parentheses around the matched type (e.g., match :\s*\(?${type}\)? before handling []/unions), or add a dedicated branch to handle the (...)[] form.

Suggested change
// Match e.g. ": File" followed by word boundary, array brackets, or union/nullable syntax
// This prevents false positives like ": FileType" or ": SomeFile"
// Escape special regex characters (getSchemaType can theoretically return complex types like "File | null" or "UtilRequiredKeys<File, ...>")
const escapedType = dataType.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
return new RegExp(`:\\s*${escapedType}(?:\\[\\]|\\s*\\||\\b|$)`).test(
content,
);
// Match e.g. ": File" or ": (File)" (optionally with unions like "(File | null)")
// followed by word boundary, array brackets, or union/nullable syntax.
// This prevents false positives like ": FileType" or ": SomeFile".
// Escape special regex characters (getSchemaType can theoretically return complex types like "File | null" or "UtilRequiredKeys<File, ...>")
const escapedType = dataType.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
// Allow either a bare type or a parenthesized form that may contain unions, e.g. "(File | null)".
const pattern = `:\\s*(?:\\(\\s*${escapedType}(?:\\s*\\|[^)]*)?\\)|${escapedType})(?:\\[\\]|\\s*\\||\\b|$)`;
return new RegExp(pattern).test(content);

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})
) {
contentKind = CONTENT_KIND.FORM_DATA;
}
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