Fix MTROperationalCredentialsClusterAttestationResponseParams.attesta…

…tionChallenge on Darwin.

This got broken because we had no tests.

Also makes attestationChallenge work when invoking via the
MTRDevice/MTRBaseDevice interface, not just MTRCluster/MTRBaseCluster.

src/darwin/Framework/CHIP/MTRBaseDevice.h

@@ -79,7 +79,12 @@ NS_ASSUME_NONNULL_BEGIN
  *                A structure-value is an NSArray object with NSDictionary objects as its elements. Each dictionary element will
  *                contain the following key values.
  *
- *                MTRContextTagKey : NSNumber object as context tag.
+ *                MTRContextTagKey : NSNumber object as context tag.  This can
+ *                                   actually be a fully-qualified profile tag,
+ *                                   but for compatibility it's using the same
+ *                                   key name.  The two types of tags can be
+ *                                   told apart by checking whether the value is
+ *                                   in the context tag range (0 <= tag <= 0xFF).
  *                MTRDataKey : Data-value NSDictionary object.
  *
  *                An array-value is an NSArray object with NSDictionary objects as its elements. Each dictionary element will

src/darwin/Framework/CHIP/MTRBaseDevice.mm

@@ -14,6 +14,7 @@
  *    See the License for the specific language governing permissions and
  *    limitations under the License.
  */
+#import <Matter/MTRClusterConstants.h>
 #import <Matter/MTRDefines.h>
 
 #import "MTRAttributeTLVValueDecoder_Internal.h"
@@ -583,7 +584,17 @@ - (void)subscribeWithQueue:(dispatch_queue_t)queue
             NSMutableDictionary * arrayElement = [NSMutableDictionary dictionary];
             [arrayElement setObject:value forKey:MTRDataKey];
             if (dataTLVType == chip::TLV::kTLVType_Structure) {
-                [arrayElement setObject:[NSNumber numberWithUnsignedLong:TagNumFromTag(tag)] forKey:MTRContextTagKey];
+                uint64_t tagNum;
+                if (IsContextTag(tag)) {
+                    tagNum = TagNumFromTag(tag);
+                } else if (IsProfileTag(tag)) {
+                    uint64_t profile = ProfileIdFromTag(tag);
+                    tagNum = (profile << kProfileIdShift) | TagNumFromTag(tag);
+                } else {
+                    MTR_LOG_ERROR("Skipping unknown tag type when decoding TLV structure.");
+                    continue;
+                }
+                [arrayElement setObject:[NSNumber numberWithUnsignedLongLong:tagNum] forKey:MTRContextTagKey];
             }
             [array addObject:arrayElement];
         }
@@ -680,14 +691,28 @@ static CHIP_ERROR MTREncodeTLVFromDataValueDictionary(id object, chip::TLV::TLVW
                 MTR_LOG_ERROR("Error: Structure element to encode has corrupt type: %@", [element class]);
                 return CHIP_ERROR_INVALID_ARGUMENT;
             }
-            NSNumber * elementTag = element[MTRContextTagKey];
+            id elementTag = element[MTRContextTagKey];
             id elementValue = element[MTRDataKey];
             if (!elementTag || !elementValue) {
                 MTR_LOG_ERROR("Error: Structure element to encode has corrupt value: %@", element);
                 return CHIP_ERROR_INVALID_ARGUMENT;
             }
+            if (![elementTag isKindOfClass:NSNumber.class]) {
+                MTR_LOG_ERROR("Error: Structure element to encode has corrupt tag type: %@", [elementTag class]);
+                return CHIP_ERROR_INVALID_ARGUMENT;
+            }
+
+            // Our tag might actually be a profile tag.
+            uint64_t tagValue = [elementTag unsignedLongLongValue];
+            TLV::Tag tag;
+            if (tagValue > UINT8_MAX) {
+                tag = TLV::ProfileTag(tagValue >> kProfileIdShift,
+                    (tagValue & ((1ull << kProfileIdShift) - 1)));
+            } else {
+                tag = TLV::ContextTag(static_cast<uint8_t>(tagValue));
+            }
             ReturnErrorOnFailure(
-                MTREncodeTLVFromDataValueDictionary(elementValue, writer, chip::TLV::ContextTag([elementTag unsignedCharValue])));
+                MTREncodeTLVFromDataValueDictionary(elementValue, writer, tag));
         }
         ReturnErrorOnFailure(writer.EndContainer(outer));
         return CHIP_NO_ERROR;
@@ -751,10 +776,10 @@ CHIP_ERROR Encode(chip::TLV::TLVWriter & writer, chip::TLV::Tag tag) const
 
     static bool MustUseTimedInvoke() { return false; }
 
-    id _Nullable GetDecodedObject() const { return decodedObj; }
+    NSDictionary<NSString *, id> * _Nullable GetDecodedObject() const { return decodedObj; }
 
 private:
-    id _Nullable decodedObj;
+    NSDictionary<NSString *, id> * _Nullable decodedObj;
 };
 
 // Callback bridge for MTRDataValueDictionaryCallback
@@ -1252,15 +1277,41 @@ - (void)_invokeCommandWithEndpointID:(NSNumber *)endpointID
     auto * bridge = new MTRDataValueDictionaryCallbackBridge(queue, completion,
         ^(ExchangeManager & exchangeManager, const SessionHandle & session, MTRDataValueDictionaryCallback successCb,
             MTRErrorCallback failureCb, MTRCallbackBridgeBase * bridge) {
+            NSData * attestationChallenge;
+            if ([clusterID isEqualToNumber:@(MTRClusterIDTypeOperationalCredentialsID)] &&
+                [commandID isEqualToNumber:@(MTRCommandIDTypeClusterOperationalCredentialsCommandAttestationRequestID)] && session->IsSecureSession()) {
+                // An AttestationResponse command needs to have an attestationChallenge
+                // to make sense of the results.  If we are doing an
+                // AttestationRequest, store the challenge now.
+                attestationChallenge = AsData(session->AsSecureSession()->GetCryptoContext().GetAttestationChallenge());
+            }
             // NSObjectCommandCallback guarantees that there will be exactly one call to either the success callback or the failure
             // callback.
-            auto onSuccessCb = [successCb, bridge](const app::ConcreteCommandPath & commandPath, const app::StatusIB & status,
+            auto onSuccessCb = [successCb, bridge, attestationChallenge](const app::ConcreteCommandPath & commandPath, const app::StatusIB & status,
                                    const MTRDataValueDictionaryDecodableType & responseData) {
                 auto resultArray = [[NSMutableArray alloc] init];
                 if (responseData.GetDecodedObject()) {
+                    auto response = responseData.GetDecodedObject();
+                    if (attestationChallenge != nil) {
+                        // Add the attestationChallenge to our data.
+                        NSArray<NSDictionary<NSString *, id> *> * value = response[MTRValueKey];
+                        NSMutableArray<NSDictionary<NSString *, id> *> * newValue = [[NSMutableArray alloc] initWithCapacity:(value.count + 1)];
+                        [newValue addObjectsFromArray:value];
+                        [newValue addObject:@{
+                            MTRContextTagKey : @(kAttestationChallengeTagValue),
+                            MTRDataKey : @ {
+                                MTRTypeKey : MTROctetStringValueType,
+                                MTRValueKey : attestationChallenge,
+                            },
+                        }];
+                        auto * newResponse = [NSMutableDictionary dictionaryWithCapacity:(response.count + 1)];
+                        [newResponse addEntriesFromDictionary:response];
+                        newResponse[MTRValueKey] = newValue;
+                        response = newResponse;
+                    }
                     [resultArray addObject:@ {
                         MTRCommandPathKey : [[MTRCommandPath alloc] initWithPath:commandPath],
-                        MTRDataKey : responseData.GetDecodedObject()
+                        MTRDataKey : response,
                     }];
                 } else {
                     [resultArray addObject:@ { MTRCommandPathKey : [[MTRCommandPath alloc] initWithPath:commandPath] }];

src/darwin/Framework/CHIP/MTRBaseDevice_Internal.h

@@ -26,10 +26,24 @@
 #include <app/EventHeader.h>
 #include <app/EventLoggingTypes.h>
 #include <app/EventPathParams.h>
+#include <lib/core/CHIPVendorIdentifiers.hpp>
+#include <lib/core/TLVTags.h>
 #include <system/SystemPacketBuffer.h>
 
 @class MTRDeviceController;
 
+// An AttestationResponse command needs to have an attestationChallenge
+// to make sense of the results.  Encode that with a profile-specific tag under
+// the Apple vendor id.  Let's select profile 0xFFFF just because.
+inline constexpr chip::TLV::Tag kAttestationChallengeTag = chip::TLV::ProfileTag(chip::VendorId::Apple, 0xFFFF, 0);
+
+// We have no way to extract the tag value as a single thing, so just do it
+// manually.
+inline constexpr unsigned kProfileIdShift = 32;
+inline constexpr uint64_t kAttestationChallengeTagProfile = chip::TLV::ProfileIdFromTag(kAttestationChallengeTag);
+inline constexpr uint64_t kAttestationChallengeTagNumber = chip::TLV::TagNumFromTag(kAttestationChallengeTag);
+inline constexpr uint64_t kAttestationChallengeTagValue = (kAttestationChallengeTagProfile << kProfileIdShift) | kAttestationChallengeTagNumber;
+
 NS_ASSUME_NONNULL_BEGIN
 
 static inline MTRTransportType MTRMakeTransportType(chip::Transport::Type type)

src/darwin/Framework/CHIP/MTRCallbackBridgeBase.h

@@ -20,18 +20,13 @@
 #import "MTRBaseDevice_Internal.h"
 #import "MTRDeviceController_Internal.h"
 #import "MTRError_Internal.h"
-#import "NSDataSpanConversion.h"
 #import "zap-generated/MTRBaseClusters.h"
-#import "zap-generated/MTRCommandPayloads_Internal.h"
 
-#include <app-common/zap-generated/cluster-objects.h>
 #include <app/data-model/NullObject.h>
 #include <messaging/ExchangeMgr.h>
 #include <platform/CHIPDeviceLayer.h>
 #include <transport/Session.h>
 
-#include <type_traits>
-
 NS_ASSUME_NONNULL_BEGIN
 
 /**
@@ -152,23 +147,8 @@ using MTRActionBlockT = CHIP_ERROR (^)(chip::Messaging::ExchangeManager & exchan
 template <typename SuccessCallback>
 using MTRLocalActionBlockT = CHIP_ERROR (^)(SuccessCallback successCb, MTRErrorCallback failureCb);
 
-class NoAttestationChallenge {
-};
-
-class HaveAttestationChallenge {
-protected:
-    NSData * mAttestationChallenge;
-};
-
-namespace detail {
-using AttestationResponseCallback
-    = void (*)(void *, const chip::app::Clusters::OperationalCredentials::Commands::AttestationResponse::DecodableType &);
-} // namespace detail
-
 template <class T>
-class MTRCallbackBridge : public MTRCallbackBridgeBase,
-                          protected std::conditional<std::is_same_v<T, detail::AttestationResponseCallback>,
-                              HaveAttestationChallenge, NoAttestationChallenge>::type {
+class MTRCallbackBridge : public MTRCallbackBridgeBase {
 public:
     using MTRActionBlock = MTRActionBlockT<T>;
     using MTRLocalActionBlock = MTRLocalActionBlockT<T>;
@@ -253,10 +233,6 @@ class MTRCallbackBridge : public MTRCallbackBridgeBase,
             return;
         }
 
-        if constexpr (HaveAttestationChallenge()) {
-            this->mAttestationChallenge = AsData(session.Value()->AsSecureSession()->GetCryptoContext().GetAttestationChallenge());
-        }
-
         CHIP_ERROR err = action(*exchangeManager, session.Value(), mSuccess, mFailure, this);
         if (err != CHIP_NO_ERROR) {
             ChipLogError(Controller, "Failure performing action. C++-mangled success callback type: '%s', error: %s",
@@ -277,18 +253,7 @@ class MTRCallbackBridge : public MTRCallbackBridgeBase,
 
     static void DispatchFailure(void * context, NSError * error) { DispatchCallbackResult(context, error, nil); }
 
-    template <typename ResponseType>
-    static void SetAttestationChallengeIfNeeded(void * context, ResponseType * _Nonnull response)
-    {
-        if constexpr (HaveAttestationChallenge()) {
-            auto * self = static_cast<MTRCallbackBridge *>(context);
-            response.attestationChallenge = self->mAttestationChallenge;
-        }
-    }
-
 private:
-    static constexpr bool HaveAttestationChallenge() { return std::is_same_v<T, detail::AttestationResponseCallback>; }
-
     static void DispatchCallbackResult(void * context, NSError * _Nullable error, id _Nullable value)
     {
         MTRCallbackBridge * callbackBridge = static_cast<MTRCallbackBridge *>(context);

src/darwin/Framework/CHIP/templates/MTRCommandPayloadsObjc-src.zapt

@@ -97,6 +97,84 @@ NS_ASSUME_NONNULL_BEGIN
     err = chip::app::DataModel::Decode(reader, decodedStruct);
     if (err == CHIP_NO_ERROR) {
       err = [self _setFieldsFromDecodableStruct:decodedStruct];
+      {{#if (and (isStrEqual (asUpperCamelCase parent.name preserveAcronyms=true) "OperationalCredentials")
+                 (isStrEqual (asUpperCamelCase name preserveAcronyms=true) "AttestationResponse"))}}
+      if (err == CHIP_NO_ERROR) {
+        do {
+          // AttestationResponse has an extra attestationChallenge field.  Once we
+          // have some sort of more direct decoding from the responseValue, we can
+          // probably make this less hardcoded.
+          //
+          // It might be simpler to look for the right profile tag in the TLV, but let's stick to examining
+          // the responseValue we were handed.
+          id data = responseValue[MTRDataKey];
+          if (![data isKindOfClass:NSDictionary.class]) {
+            err = CHIP_ERROR_INVALID_ARGUMENT;
+            break;
+          }
+
+          NSDictionary * dataDictionary = data;
+          if (dataDictionary[MTRTypeKey] == nil || ![dataDictionary[MTRTypeKey] isEqualTo:MTRStructureValueType]) {
+            err = CHIP_ERROR_INVALID_ARGUMENT;
+            break;
+          }
+
+          id value = dataDictionary[MTRValueKey];
+          if (value == nil || ![value isKindOfClass:NSArray.class]) {
+            err = CHIP_ERROR_INVALID_ARGUMENT;
+            break;
+          }
+
+          NSArray * valueArray = value;
+          for (id item in valueArray) {
+            if (![item isKindOfClass:NSDictionary.class]) {
+                err = CHIP_ERROR_INVALID_ARGUMENT;
+                break;
+            }
+
+            NSDictionary * itemDictionary = item;
+            id contextTag = itemDictionary[MTRContextTagKey];
+            if (contextTag == nil || ![contextTag isKindOfClass:NSNumber.class]) {
+              err = CHIP_ERROR_INVALID_ARGUMENT;
+              break;
+            }
+
+            NSNumber * contextTagNumber = contextTag;
+            if (![contextTagNumber isEqualToNumber:@(kAttestationChallengeTagValue)]) {
+              // Not the right field; keep going.
+              continue;
+            }
+
+            id data = itemDictionary[MTRDataKey];
+            if (data == nil || ![data isKindOfClass:NSDictionary.class]) {
+              err = CHIP_ERROR_INVALID_ARGUMENT;
+              break;
+            }
+
+            NSDictionary * dataDictionary = data;
+            id dataType = dataDictionary[MTRTypeKey];
+            id dataValue = dataDictionary[MTRValueKey];
+            if (dataType == nil || dataValue == nil ||
+                ![dataType isKindOfClass:NSString.class] ||
+                ![dataValue isKindOfClass:NSData.class]) {
+              err = CHIP_ERROR_INVALID_ARGUMENT;
+              break;
+            }
+
+            NSString * dataTypeString = dataType;
+            if (![dataTypeString isEqualToString:MTROctetStringValueType]) {
+              err = CHIP_ERROR_INVALID_ARGUMENT;
+              break;
+            }
+
+            self.attestationChallenge = dataValue;
+            break;
+          }
+
+          // Do not add code here without first checking whether err is success.
+        } while (0);
+      }
+      {{/if}}
       if (err == CHIP_NO_ERROR) {
         return self;
       }

src/darwin/Framework/CHIP/templates/MTRCommandPayloads_Internal.zapt

@@ -7,7 +7,7 @@
 NS_ASSUME_NONNULL_BEGIN
 
 @interface MTROperationalCredentialsClusterAttestationResponseParams ()
-@property (nonatomic, strong) NSData * attestationChallenge;
+@property (nonatomic, copy) NSData * attestationChallenge;
 @end
 
 {{#zcl_clusters}}