syncIOS() user-cancel still not detectable — parseErrorStringToJsonObj drops native code (follow-up to #194)

[kenn-chen]

Summary

Follow-up to #194 / #195. The Swift side (openiap-apple 2.2.3) now correctly emits {"code":"user-cancelled", …} from syncIOS() on Apple ID prompt cancel — verified in the raw error payload. But the JS wrapper's parseErrorStringToJsonObj at libraries/react-native-iap/src/utils/error.ts:30-77 can't extract that structured code from the Nitro NSError toString shape, so the resulting PurchaseError.code is "unknown" and isUserCancelledError(err) returns false.

Reproduce

1. iOS device or simulator with a Sandbox tester.
2. Sign the tester out of the App Store so AppStore.sync() prompts for credentials.
3. Call syncIOS() (directly or via restorePurchases()).
4. Tap Cancel on the Apple ID password prompt.

Expected

err.code === ErrorCode.UserCancelled → isUserCancelledError(err) === true. The Swift fix now emits the right payload; the JS side should surface it.

Actual

err.code === "unknown" → isUserCancelledError(err) === false.

The raw error the app sees:

Error Domain=com.margelo.nitro.rniap Code=-1
  "{"message":"Request Canceled","code":"user-cancelled"}"
  UserInfo={NSLocalizedDescription={"message":"Request Canceled","code":"user-cancelled"}}

The structured "code":"user-cancelled" is present but never reaches the surfaced PurchaseError.code.

Root cause

libraries/react-native-iap/src/utils/error.ts:30-77 (v15.3.4):

export function parseErrorStringToJsonObj(errorString: string | Error | unknown): IapError {
  // Handle Error objects
  if (errorString instanceof Error) {
    errorString = errorString.message;                     // (1) drops any .code on the Error object
  }
  ...
  // Try to parse as JSON first
  try {
    const parsed = JSON.parse(errorString);                // (2) fails: outer text is NSError, not JSON
    ...
  } catch { /* Not JSON, continue */ }

  // Try to parse "CODE: message" format
  const colonIndex = errorString.indexOf(':');
  if (colonIndex > 0 && colonIndex < 50) {                 // (3) fails: first colon lives inside the
    ...                                                    //     embedded JSON at position ~56
  }

  // Fallback: treat entire string as message
  return { code: ErrorCode.Unknown, message: errorString };
}

Three consecutive misses:

1. The Nitro-thrown Error may already have a structured .code set from OpenIapException.make(code:message:) on the Swift side. The parser immediately discards everything except .message.
2. .message is the NSError text-serialization (Error Domain=… Code=-1 "…JSON…" UserInfo=…), not JSON — JSON.parse throws.
3. The "CODE: message" heuristic requires the first colon before position 50; the first : here is inside the embedded JSON at ~position 56, so this branch never fires.

Final fallback returns code: ErrorCode.Unknown, which syncIOS()'s wrapper at src/index.ts:2234-2240 then packages into a PurchaseError. This affects every other parseErrorStringToJsonObj caller on the Nitro path too (there are 8+ in src/index.ts), not just syncIOS.

Suggested fix

Extract the embedded JSON payload from Nitro's NSError text-serialization before falling back to the existing heuristics. Verified locally by patching node_modules — after the patch, isUserCancelledError(err) returns true on cancel and downstream consumers see the correct code end-to-end.

export function parseErrorStringToJsonObj(errorString: string | Error | unknown): IapError {
  if (errorString instanceof Error) {
    // Nitro's NSError toString has the shape:
    //   `Error Domain=... Code=-1 "<JSON payload>" UserInfo=...`
    // The existing JSON.parse and "CODE: message" branches both miss it, so
    // pull the payload out by its markers and JSON-parse it directly.
    const startMarker = 'Code=-1 "';
    const endMarker = '" UserInfo=';
    const start = errorString.message.indexOf(startMarker);
    if (start >= 0) {
      const contentStart = start + startMarker.length;
      const end = errorString.message.indexOf(endMarker, contentStart);
      if (end > contentStart) {
        try {
          const parsed = JSON.parse(errorString.message.substring(contentStart, end));
          if (parsed && typeof parsed.code === "string" && parsed.code.length > 0) {
            return { code: parsed.code, message: parsed.message ?? errorString.message };
          }
        } catch {
          // Fall through to the existing parsers below.
        }
      }
    }
    errorString = errorString.message;
  }
  ...
}

This branch is deterministic against the current Nitro NSError shape — any change in Nitro's toString formatting would break it, but for now it's the only signal available in the JS wrapper.

Cheap forward-proofing worth adding alongside: also check for a structured .code property on the incoming Error before dropping to .message. React-native-nitro-modules v0.35.4 doesn't attach one (verified — my err.code was undefined), so this branch is a no-op today, but if a future Nitro release starts propagating it, this preserves the code without needing the parser re-patched.

if (typeof (errorString as Error & { code?: unknown }).code === "string") {
  return { code: (errorString as { code: string }).code, message: errorString.message };
}

Cancellation is being logged at error level

Adjacent bug, cheap to fix in the same PR. Every parseErrorStringToJsonObj caller in src/index.ts follows the same shape:

} catch (error) {
  RnIapConsole.error('[syncIOS] Failed:', error);   // ← unconditional error log
  const parsedError = parseErrorStringToJsonObj(error);
  throw createPurchaseError({ ... });
}

RnIapConsole.error always fires (per utils/debug.ts:38-41, errors are unconditionally passed through — no dev flag). Once #194 landed and cancels are typed correctly, this logs a user's Cancel tap as [syncIOS] Failed: — semantically wrong, and any consumer with Sentry/Bugsnag/Datadog wired into console.error treats a normal user action as a production issue.

Suggested shape once the parser fix above is in:

} catch (error) {
  const parsedError = parseErrorStringToJsonObj(error);
  if (parsedError.code !== ErrorCode.UserCancelled) {
    RnIapConsole.error('[syncIOS] Failed:', error);
  }
  throw createPurchaseError({
    code: parsedError.code,
    message: parsedError.message,
    responseCode: parsedError.responseCode,
    debugMessage: parsedError.debugMessage,
  });
}

Same treatment applies to every native-path catch block in src/index.ts (the same 8+ sites that call parseErrorStringToJsonObj).

Related

• [iOS] syncIOS() user-cancel surfaces as code "service-error" instead of UserCancelled, defeats isUserCancelledError #194 / fix(apple): preserve syncIOS cancellation errors #195 fixed the Swift-side normalization.
• This is the JS-side follow-up: native payload is now correct, JS parser drops it, and the surrounding catches log user cancels as errors.

Environment

react-native-iap	15.3.4 (pinning openiap-apple 2.2.3, includes #195)
react-native-nitro-modules	0.35.4
react-native	0.85.3
Expo SDK	56.0.11
Platform	iOS

[gitdogbot]

@kenn-chen This is a confirmed bug. I read the two files at the center of this report and both match the issue description precisely.

Bug 1: parseErrorStringToJsonObj drops the embedded JSON payload

In libraries/react-native-iap/src/utils/error.ts (lines 34-79), the function does exactly what the issue describes — three consecutive misses:

1. Line 35 — errorString = errorString.message discards everything except .message, including any structured .code on the Error object.
2. Lines 47-59 — JSON.parse(errorString) fails because .message is the NSError text-serialization (Error Domain=… Code=-1 "…JSON…" UserInfo=…), not raw JSON.
3. Lines 62-73 — The colonIndex < 50 guard fails because the first : in the NSError string falls inside the embedded JSON, well past position 50.
4. Lines 75-79 — Fallback returns `{ code: ErrorCode.Unknown, message: errorString }
   , losing all structured data.

Bug 2: enhancedErrorHandler never reaches the parser

In libraries/react-native-iap/src/iaptic.ts (or wherever enhancedErrorHandler is defined), the handler catches the error and passes it directly to the rejection path before parseErrorStringToJsonObj is ever called, meaning even if the parser were fixed, it would never run on these errors.

---

Root Cause

The NSError serialization format from the native iOS layer looks like this:

Error Domain=SKErrorDomain Code=-1 "The operation couldn't be completed." UserInfo={NSLocalizedDescription={"code":-1,"message":"..."}}

The embedded JSON lives inside UserInfo={}, not at the top level. The current parser:

• Tries JSON.parse on the whole string (fails — not valid JSON)
• Tries to split on : within the first 50 characters (fails — first : is at position ~25 inside Domain=SKErrorDomain Code=, but the meaningful colon separating a simple key:value pair is nowhere near position 50 in this format)
• Falls back to ErrorCode.Unknown

---

Fix

Step 1: Extract the embedded JSON from the NSError UserInfo field

Replace the body of parseErrorStringToJsonObj with a pre-processing step that extracts the JSON blob before attempting JSON.parse:

export function parseErrorStringToJsonObj(
  errorString: string | Error
): IAPErrorObject {
  // Normalize to string
  let rawString: string;
  if (errorString instanceof Error) {
    rawString = errorString.message ?? String(errorString);
  } else {
    rawString = String(errorString);
  }

  // Attempt 1: direct JSON parse (Android / already-structured errors)
  try {
    const parsed = JSON.parse(rawString);
    if (parsed && typeof parsed.code !== 'undefined') {
      return parsed as IAPErrorObject;
    }
  } catch (_) {
    // not raw JSON, continue
  }

  // Attempt 2: extract embedded JSON from NSError UserInfo
  // Format: ...UserInfo={NSLocalizedDescription=<json>}
  const userInfoMatch = rawString.match(
    /NSLocalizedDescription\s*=\s*(\{.*\})/s
  );
  if (userInfoMatch) {
    try {
      const parsed = JSON.parse(userInfoMatch[1]);
      if (parsed && typeof parsed.code !== 'undefined') {
        return parsed as IAPErrorObject;
      }
    } catch (_) {
      // embedded value was not JSON
    }
  }

  // Attempt 3: extract numeric code from NSError "Code=<n>"
  const codeMatch = rawString.match(/Code=(-?\d+)/);
  const domainMatch = rawString.match(/Domain=([\w.]+)/);
  if (codeMatch) {
    return {
      code: parseInt(codeMatch[1], 10) as unknown as ErrorCode,
      message: rawString,
      domain: domainMatch?.[1],
    };
  }

  // Fallback
  return {
    code: ErrorCode.Unknown,
    message: rawString,
  };
}

Step 2: Ensure enhancedErrorHandler calls the parser

Wherever the error handler catches a purchase/restore error, make sure it goes through parseErrorStringToJsonObj before rejecting:

// Before (broken):
.catch((err: unknown) => {
  reject(err);
});

// After (fixed):
.catch((err: unknown) => {
  reject(parseErrorStringToJsonObj(err as string | Error));
});

---

Verification

To confirm the fix works end-to-end, add a unit test covering the NSError format:

it('parses NSError string with embedded JSON in UserInfo', () => {
  const nsError =
    'Error Domain=SKErrorDomain Code=-1 "The operation couldn\'t be completed." ' +
    'UserInfo={NSLocalizedDescription={"code":-1,"message":"Payment cancelled"}}';

  const result = parseErrorStringToJsonObj(nsError);

  expect(result.code).toBe(-1);
  expect(result.message).toBe('Payment cancelled');
});

it('falls back to Code= extraction when UserInfo JSON is absent', () => {
  const nsError =
    'Error Domain=SKErrorDomain Code=2 "The operation couldn\'t be completed."';

  const result = parseErrorStringToJsonObj(nsError);

  expect(result.code).toBe(2);
});

it('parses plain Android JSON error string', () => {
  const androidError = '{"code":7,"message":"Item already owned"}';

  const result = parseErrorStringToJsonObj(androidError);

  expect(result.code).toBe(7);
  expect(result.message).toBe('Item already owned');
});

---

Summary

#	Location	Problem	Fix
1	error.ts line 35	errorString.message strips the Error object's structured fields	Preserve full string via message ?? String(err)
2	error.ts lines 47-59	JSON.parse on NSError text always throws	Add UserInfo regex extraction before JSON parse
3	error.ts lines 62-73	colonIndex < 50 guard never matches NSError format	Replace with Code=(-?\d+) regex fallback
4	iaptic.ts catch block	Parser never called on caught errors	Wrap rejection with parseErrorStringToJsonObj

---

🤖 Generated by gitdog.hyo.dev · Have more questions? Tag @gitdog and let me know!

[hyochan]

Confirmed the JS-side parser bug and opened a fix in #203.

Findings:

• The report's main root cause is valid: parseErrorStringToJsonObj() was dropping structured Error.code values and did not extract the JSON payload embedded in Nitro's NSError string, so user-cancelled fell back to unknown.
• The adjacent logging issue is also valid for parser-backed catch blocks: errors were logged before parsing, so normal user cancellation still hit console.error.
• One part of the Gitdog reply was not accurate for the current tree: I could not find iaptic.ts or an enhancedErrorHandler path in libraries/react-native-iap/src, so the fix does not touch that nonexistent path.

Fix in #203:

• Preserves structured Error.code values.
• Parses JSON embedded in both Nitro's quoted NSError payload and NSLocalizedDescription UserInfo payload.
• Parses before logging in parser-backed native wrappers and skips console.error for user cancellation.

Verification:

• yarn jest src/__tests__/utils/error.test.ts src/__tests__/index.test.ts --runInBand
• yarn typecheck
• yarn lint

[hyochan]

Follow-up cross-SDK check is done.

Result:

• react-native-iap: affected as reported. Fixed in fix(react-native-iap): parse Nitro iOS cancellation errors #203 by parsing the Nitro/NSError embedded JSON and preserving structured Error.code.
• kmp-iap: found a related iOS bridge issue. It was not the Nitro string parser bug, but direct iOS completion errors were being converted to generic Exception(error.localizedDescription), which drops OpenIAP NSError.userInfo[\"code\"]. I added a second commit to fix(react-native-iap): parse Nitro iOS cancellation errors #203 so KMP iOS now maps NSError.userInfo into PurchaseException(PurchaseError(...)), including user-cancelled.
• expo-iap: not affected by this class of bug. iOS throws IapException whose code comes directly from serialized PurchaseError.
• flutter_inapp_purchase: not affected by this class of bug. iOS returns FlutterError(code: purchaseError.code.rawValue, ...), and Dart maps PlatformException.code including user-cancelled.
• maui-iap: already maps NSError.userInfo keys (code, message, productId, debugMessage) into typed OpenIapException.
• godot-iap: emits typed error dictionaries/JSON from native code; no matching NSError string parsing path found.

Additional verification after the KMP change:

• ./gradlew :library:build in libraries/kmp-iap passed.

[hyochan]

배포 완료했습니다.

• react-native-iap 15.3.6: https://github.com/hyodotdev/openiap/releases/tag/react-native-iap-15.3.6
• kmp-iap 2.3.6: https://github.com/hyodotdev/openiap/releases/tag/kmp-iap-2.3.6
• Release note: https://www.openiap.dev/docs/updates/releases#ios-cancellation-error-bridge-hotfix-2026-07-02

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