Respond to CR.

Signal/src/call/PeerConnectionClient.swift

@@ -1112,6 +1112,16 @@ class HardenedRTCSessionDescription {
 
     var logSafeDescription: String {
         #if DEBUG
+        return sdp
+        #else
+        return redactIPV6(sdp: redactIcePwd(sdp: sdp))
+        #endif
+    }
+
+    private func redactIcePwd(sdp: String) -> String {
+        #if DEBUG
+        return sdp
+        #else
         var text = sdp
         text = text.replacingOccurrences(of: "\r", with: "\n")
         text = text.replacingOccurrences(of: "\n\n", with: "\n")
@@ -1124,8 +1134,31 @@ class HardenedRTCSessionDescription {
         }
         let filteredText = filteredLines.joined(separator: "\n")
         return filteredText
-        #else
+        #endif
+    }
+
+    private func redactIPV6(sdp: String) -> String {
+        #if DEBUG
         return sdp
+        #else
+
+        // Example values to match:
+        //
+        // * 2001:0db8:85a3:0000:0000:8a2e:0370:7334
+        // * 2001:db8:85a3::8a2e:370:7334
+        // * ::1
+        // * ::
+        // * ::ffff:192.0.2.128
+        //
+        // See: https://en.wikipedia.org/wiki/IPv6_addresshttps://en.wikipedia.org/wiki/IPv6_address
+        do {
+            let regex = try NSRegularExpression(pattern: "[\\da-f]*:[\\da-f]*:[\\da-f:\\.]*",
+                options: .caseInsensitive)
+            return regex.stringByReplacingMatches(in: sdp, options: [], range: NSRange(location: 0, length: sdp.count), withTemplate: "[ REDACTED_IPV6_ADDRESS ]")
+        } catch {
+            owsFail("Could not redact IPv6 addresses.")
+            return "[Could not redact IPv6 addresses.]"
+        }
         #endif
     }
 }

Signal/test/util/OWSScrubbingLogFormatterTest.m

@@ -105,18 +105,20 @@ NS_ASSUME_NONNULL_BEGIN
     id<DDLogFormatter> defaultFormatter = [DDLogFileFormatterDefault new];
 
     NSDictionary<NSString *, NSString *> *valueMap = @{
-        @"0.0.0.0" : @"[ REDACTED_IP_ADDRESS:...0 ]",
-        @"127.0.0.1" : @"[ REDACTED_IP_ADDRESS:...1 ]",
-        @"255.255.255.255" : @"[ REDACTED_IP_ADDRESS:...255 ]",
-        @"1.2.3.4" : @"[ REDACTED_IP_ADDRESS:...4 ]",
-        @"0.0.0.0.0.0" : @"[ REDACTED_IP_ADDRESS:...0 ]",
-        @"255.255.255.255.255.255" : @"[ REDACTED_IP_ADDRESS:...255 ]",
+        @"0.0.0.0" : @"[ REDACTED_IPV4_ADDRESS:...0 ]",
+        @"127.0.0.1" : @"[ REDACTED_IPV4_ADDRESS:...1 ]",
+        @"255.255.255.255" : @"[ REDACTED_IPV4_ADDRESS:...255 ]",
+        @"1.2.3.4" : @"[ REDACTED_IPV4_ADDRESS:...4 ]",
     };
     NSArray<NSString *> *messageFormats = @[
         @"a%@b",
         @"http://%@",
+        @"http://%@/",
         @"%@ and %@ and %@",
         @"%@",
+        @"%@ %@",
+        @"no ip address!",
+        @"",
     ];
 
     for (NSString *ipAddress in valueMap) {
@@ -125,16 +127,18 @@ NS_ASSUME_NONNULL_BEGIN
         for (NSString *messageFormat in messageFormats) {
             NSString *message = [messageFormat stringByReplacingOccurrencesOfString:@"%@" withString:ipAddress];
 
+            NSString *unredactedMessage = [defaultFormatter formatLogMessage:[self messageWithString:messageFormat]];
             NSString *expectedRedactedMessage = [defaultFormatter
                 formatLogMessage:[self messageWithString:[messageFormat
                                                              stringByReplacingOccurrencesOfString:@"%@"
                                                                                        withString:redactedIPAddress]]];
             NSString *redactedMessage = [scrubbingFormatter formatLogMessage:[self messageWithString:message]];
 
-            XCTAssertEqualObjects(expectedRedactedMessage, redactedMessage);
+            XCTAssertEqualObjects(
+                expectedRedactedMessage, redactedMessage, @"Scrubbing failed for message: %@", unredactedMessage);
 
             NSRange ipAddressRange = [redactedMessage rangeOfString:ipAddress];
-            XCTAssertEqual(NSNotFound, ipAddressRange.location, "Failed to redact IP address: %@", redactedMessage);
+            XCTAssertEqual(NSNotFound, ipAddressRange.location, "Failed to redact IP address: %@", unredactedMessage);
         }
     }
 }

SignalMessaging/utils/OWSScrubbingLogFormatter.m

@@ -40,16 +40,14 @@ NS_ASSUME_NONNULL_BEGIN
     return regex;
 }
 
-- (NSRegularExpression *)ipAddressRegex
+- (NSRegularExpression *)ipV4AddressRegex
 {
     static NSRegularExpression *regex = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
-        // Match IPv4 and IPv6 addresses.
-        //
-        // NOTE: the second group matches the last "quad/hex?" of the IPv4/IPv6 address.
+        // NOTE: The group matches the last quad of the IPv4 address.
         NSError *error;
-        regex = [NSRegularExpression regularExpressionWithPattern:@"(\\d+\\.\\d+\\.)?\\d+\\.\\d+\\.\\d+\\.(\\d+)"
+        regex = [NSRegularExpression regularExpressionWithPattern:@"\\d+\\.\\d+\\.\\d+\\.(\\d+)"
                                                           options:NSRegularExpressionCaseInsensitive
                                                             error:&error];
         if (error || !regex) {
@@ -79,11 +77,11 @@ NS_ASSUME_NONNULL_BEGIN
                                                       range:NSMakeRange(0, [logString length])
                                                withTemplate:@"[ REDACTED_DATA:$1... ]"];
 
-    NSRegularExpression *ipAddressRegex = self.ipAddressRegex;
-    logString = [ipAddressRegex stringByReplacingMatchesInString:logString
-                                                         options:0
-                                                           range:NSMakeRange(0, [logString length])
-                                                    withTemplate:@"[ REDACTED_IP_ADDRESS:...$2 ]"];
+    NSRegularExpression *ipV4AddressRegex = self.ipV4AddressRegex;
+    logString = [ipV4AddressRegex stringByReplacingMatchesInString:logString
+                                                           options:0
+                                                             range:NSMakeRange(0, [logString length])
+                                                      withTemplate:@"[ REDACTED_IPV4_ADDRESS:...$1 ]"];
 
     return logString;
 }