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fix(schema): validate base64 attachments in linear time #58811

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rekram1-node merged 1 commit into from
Oct 24, 2026
+5 −1
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fix(schema): validate base64 attachments in linear time #58811

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6 changes: 5 additions & 1 deletion packages/schema/src/prompt.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -18,8 +18,12 @@ export const FileSource = Schema.Union([
.annotate({ identifier: "Prompt.FileSource" })
export type FileSource = typeof FileSource.Type

// The canonical pattern backtracks on large inputs, so it only supplies metadata (OpenAPI, errors) while an equivalent linear check runs.
export const Base64 = Schema.String.check(
Schema.isPattern(/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/u),
Schema.makeFilter(
(value: string) => value.length % 4 === 0 && /^[A-Za-z0-9+/]*={0,2}$/u.test(value),
Schema.isPattern(/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/u).annotations,
),
).annotate({ identifier: "Prompt.Base64" })
export type Base64 = typeof Base64.Type

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