Tell the login server when duplicate keys are OK

Author: swansontec

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- fixed: Allow duplicate sync keys when performing a wallet split, in case a previous failed attempt left a repo behind.
 - fixed: Do not lose wallet import history when doing a split-archive-split.
 
 ## 2.38.3 (2026-01-06)

src/core/fake/fake-server.ts

@@ -275,6 +275,7 @@ function createLogin(request: ApiRequest, login?: DbLogin): HttpResponse {
 
   // Set up repos:
   const keys = asMaybe(asCreateKeysPayload, () => ({
+    allowExisting: false,
     newSyncKeys: [],
     keyBoxes: []
   }))(body.data)

src/core/login/keys.ts

@@ -67,11 +67,15 @@ export function makeKeyInfo(
 
 /**
  * Assembles all the resources needed to attach new keys to the account.
+ * @param allowExisting True if the sync keys were derived deterministically,
+ * which implies that duplicate sync keys on the server are not errors,
+ * but leftovers from an earlier failed splitting attempt.
  */
 export function makeKeysKit(
   ai: ApiInput,
   sessionKey: SessionKey,
-  keyInfos: EdgeWalletInfo[]
+  keyInfos: EdgeWalletInfo[],
+  allowExisting: boolean = false
 ): LoginKit {
   // For crash errors:
   ai.props.log.breadcrumb('makeKeysKit', {})
@@ -95,7 +99,7 @@ export function makeKeysKit(
 
   return {
     loginId: sessionKey.loginId,
-    server: wasCreateKeysPayload({ keyBoxes, newSyncKeys }),
+    server: wasCreateKeysPayload({ allowExisting, keyBoxes, newSyncKeys }),
     serverPath: '/v2/login/keys',
     stash: { keyBoxes }
   }

src/core/login/splitting.ts

@@ -157,7 +157,7 @@ export async function splitWalletInfo(
   }
 
   // Add the keys to the login:
-  const kit = makeKeysKit(ai, sessionKey, [newWalletInfo])
+  const kit = makeKeysKit(ai, sessionKey, [newWalletInfo], true)
   await applyKit(ai, sessionKey, kit)
 
   // Try to copy metadata on a best-effort basis.

src/types/server-cleaners.ts

@@ -245,6 +245,7 @@ export const asChangeVouchersPayload: Cleaner<ChangeVouchersPayload> = asObject(
 )
 
 export const asCreateKeysPayload: Cleaner<CreateKeysPayload> = asObject({
+  allowExisting: asOptional(asBoolean, false),
   keyBoxes: asArray(asEdgeBox),
   newSyncKeys: asOptional(asArray(asString), () => [])
 })

src/types/server-types.ts

@@ -168,6 +168,7 @@ export interface ChangeVouchersPayload {
 }
 
 export interface CreateKeysPayload {
+  allowExisting: boolean
   keyBoxes: EdgeBox[]
   newSyncKeys: string[]
 }