Skip filtered lookup for empty occurrence exports

backend/src/api-tests/occurrence/dwcArchiveExportOccurrences.test.ts

@@ -82,6 +82,24 @@ describe('DwC-A occurrence export (admin-only)', () => {
     expect(occurrenceCsv).not.toContain('NOW:OCC:24750:')
   })
 
+  it('uses the unfiltered export path for empty POST filters', async () => {
+    const loginResult = await send<{ token: string }>('user/login', 'POST', { username: 'testSu', password: 'test' })
+    expect(loginResult.status).toEqual(200)
+
+    const result = await request(app)
+      .post('/occurrence/export/dwc-archive')
+      .set('authorization', `bearer ${loginResult.body.token}`)
+      .send({ columnFilters: [], sorting: [] })
+      .buffer(true)
+      .parse(parseBinary)
+
+    expect(result.status).toEqual(200)
+    const zip = await JSZip.loadAsync(result.body as unknown as Buffer)
+    const occurrenceCsv = await zip.file('occurrence.csv')!.async('string')
+    expect(occurrenceCsv).toContain('NOW:OCC:21050:')
+    expect(occurrenceCsv).toContain('NOW:OCC:24750:')
+  })
+
   it('returns an empty filtered DwC-DP ZIP archive for POST requests', async () => {
     const loginResult = await send<{ token: string }>('user/login', 'POST', { username: 'testSu', password: 'test' })
     expect(loginResult.status).toEqual(200)

backend/src/routes/occurrence.ts

@@ -32,6 +32,12 @@ const defaultCrossSearchExportFilters = {
   sorting: [],
 } satisfies CrossSearchRequestParameters
 
+const hasEmptyExportFilters = (parameters: Partial<CrossSearchRequestParameters>): boolean => {
+  const columnFilters = parameters.columnFilters ?? defaultCrossSearchExportFilters.columnFilters
+  const sorting = parameters.sorting ?? defaultCrossSearchExportFilters.sorting
+  return Array.isArray(columnFilters) && columnFilters.length === 0 && Array.isArray(sorting) && sorting.length === 0
+}
+
 class ExportFilterValidationError extends Error {
   validationErrors: ValidationObject[]
 
@@ -44,6 +50,7 @@ class ExportFilterValidationError extends Error {
 const resolveOccurrenceKeysForExport = async (req: Request): Promise<DwcOccurrenceKey[] | undefined> => {
   if (req.method === 'GET') return undefined
   const body = req.body as Partial<CrossSearchRequestParameters> | undefined
+  if (!body || hasEmptyExportFilters(body)) return undefined
   const result = await getFilteredCrossSearchOccurrenceKeys(req.user, {
     columnFilters: body?.columnFilters ?? defaultCrossSearchExportFilters.columnFilters,
     sorting: body?.sorting ?? defaultCrossSearchExportFilters.sorting,