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fix(app): limit export filename length #49143

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fix(app): limit export filename length #49143

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7 changes: 7 additions & 0 deletions packages/app/src/utils/session-export.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,13 @@ describe("sessionExportFilename", () => {
test("falls back to id when title and slug are empty", () => {
expect(sessionExportFilename({ id: "ses_123" })).toBe("ses_123.json")
})

test("limits filename length while preserving the extension", () => {
const filename = sessionExportFilename({ id: "ses_123", title: "x".repeat(300) })

expect(filename).toBe(`${"x".repeat(250)}.json`)
expect(new TextEncoder().encode(filename)).toHaveLength(255)
})
})

describe("fetchSessionExport", () => {
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3 changes: 3 additions & 0 deletions packages/app/src/utils/session-export.ts
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Expand Up @@ -16,6 +16,8 @@ export type SessionExportClient = {
}
}

const MAX_EXPORT_BASENAME_LENGTH = 250

export async function fetchSessionExport(input: {
sessionID: string
client: SessionExportClient
Expand Down Expand Up @@ -43,6 +45,7 @@ export function sessionExportFilename(session: { id: string; title?: string; slu
const clean = name
.toLowerCase()
.replace(/[^a-z0-9_-]+/gi, "-")
.slice(0, MAX_EXPORT_BASENAME_LENGTH)
.replace(/^-+|-+$/g, "")
return `${clean || session.id}.json`
}
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