DynamicLinks: Skip retrieving web locale when running targeting below iOS14 (only on simulator & Apple Silicon) (#7989)

ncooke3 · web-flow · commit 8be7fa599630 · 2021-04-27T20:55:37.000-04:00
* Conditionally make WebKit allocations

* Clean up approach

* Style

* Still call delegate method

* Make C function static

* Updated CHANGELOG
diff --git a/FirebaseDynamicLinks/CHANGELOG.md b/FirebaseDynamicLinks/CHANGELOG.md
@@ -1,3 +1,6 @@
+# v8.0.0
+- [fixed] Fixed crashes on simulators targeting below iOS14 on Apple Silicon. (#7989)
+
 # v7.7.0
 - [added] Added `utmParametersDictionary` property to `DynamicLink`. (#6730)
 
diff --git a/FirebaseDynamicLinks/Sources/FIRDLJavaScriptExecutor.m b/FirebaseDynamicLinks/Sources/FIRDLJavaScriptExecutor.m
@@ -17,6 +17,8 @@
 #import <TargetConditionals.h>
 #if TARGET_OS_IOS
 
+#import <sys/sysctl.h>
+
 #import <WebKit/WebKit.h>
 
 #import "FirebaseDynamicLinks/Sources/FIRDLJavaScriptExecutor.h"
@@ -73,6 +75,19 @@ - (instancetype)initWithDelegate:(id<FIRDLJavaScriptExecutorDelegate>)delegate
 
 #pragma mark - Internal methods
 - (void)start {
+// Initializing a `WKWebView` causes a memory allocation error when the process
+// is running under Rosetta translation on Apple Silicon.
+// The issue only occurs on the simulator in apps targeting below iOS 14. (Issue #7618)
+#if TARGET_OS_SIMULATOR
+  BOOL systemVersionAtLeastiOS14 = [NSProcessInfo.processInfo
+      isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){14, 0, 0}];
+  // Perform an early exit if the process is running under Rosetta translation and targeting
+  // under iOS 14.
+  if (processIsTranslated() && !systemVersionAtLeastiOS14) {
+    [self handleExecutionError:nil];
+    return;
+  }
+#endif
   NSString *htmlContent =
       [NSString stringWithFormat:@"<html><head><script>%@</script></head></html>", _script];
 
@@ -135,6 +150,21 @@ - (void)webView:(WKWebView *)webView
   [self handleExecutionError:error];
 }
 
+// Determine whether a process is running under Rosetta translation.
+// Returns 0 for a native process, 1 for a translated process,
+// and -1 when an error occurs.
+// From:
+// https://developer.apple.com/documentation/apple-silicon/about-the-rosetta-translation-environment
+static int processIsTranslated() {
+  int ret = 0;
+  size_t size = sizeof(ret);
+  if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
+    if (errno == ENOENT) return 0;
+    return -1;
+  }
+  return ret;
+}
+
 @end
 
 NS_ASSUME_NONNULL_END
