Correctly handle local display only for SRM version.

[ Merge of http://go/wvgerrit/105343 ]

If a device only supports local display (eliminating the need for an
SRM version), then the CDM should treat this as no SRM version.

Bug: 166009716
Test: License request integration test
Change-Id: I2d9c3f98735563df6d7c7a287abab41bf0a8c513

libwvdrmengine/cdm/core/include/wv_cdm_types.h

@@ -415,6 +415,7 @@ enum CdmResponseType : int32_t {
   LICENSE_USAGE_ENTRY_MISSING = 360,
   LOAD_USAGE_ENTRY_INVALID_SESSION = 361,
   RESTORE_OFFLINE_LICENSE_ERROR_3 = 362,
+  NO_SRM_VERSION = 363,
   // Don't forget to add new values to
   //  * core/test/test_printers.cpp.
   //  * android/include/mapErrors-inl.h

libwvdrmengine/cdm/core/src/cdm_engine.cpp

@@ -617,17 +617,22 @@ CdmResponseType CdmEngine::QueryStatus(SecurityLevel security_level,
   } else if (query_token == QUERY_KEY_CURRENT_SRM_VERSION) {
     uint16_t current_srm_version;
     status = crypto_session->GetSrmVersion(&current_srm_version);
-    if (status == NOT_IMPLEMENTED_ERROR) {
+    switch (status) {
+      case NO_ERROR: {
+        *query_response = std::to_string(current_srm_version);
+        return NO_ERROR;
+      }
+      case NO_SRM_VERSION: {
+        // SRM is not supported or not applicable (ex. local display only).
         *query_response = QUERY_VALUE_NONE;
         return NO_ERROR;
-    } else if (status != NO_ERROR) {
+      }
+      default: {
         LOGW("GetCurrentSRMVersion failed: status = %d",
              static_cast<int>(status));
         return status;
       }
-
-    *query_response = std::to_string(current_srm_version);
-    return NO_ERROR;
+    }
   } else if (query_token == QUERY_KEY_SRM_UPDATE_SUPPORT) {
     bool is_srm_update_supported = crypto_session->IsSrmUpdateSupported();
     *query_response =

libwvdrmengine/cdm/core/src/crypto_session.cpp

@@ -1913,25 +1913,33 @@ CdmResponseType CryptoSession::GetSrmVersion(uint16_t* srm_version) {
   RETURN_IF_UNINITIALIZED(CRYPTO_SESSION_NOT_INITIALIZED);
   RETURN_IF_NULL(srm_version, PARAMETER_NULL);
 
-  OEMCryptoResult status;
-  WithOecReadLock("GetSrmVersion", [&] {
-    status = OEMCrypto_GetCurrentSRMVersion(srm_version);
+  const OEMCryptoResult status = WithOecReadLock("GetSrmVersion", [&] {
+    return OEMCrypto_GetCurrentSRMVersion(srm_version);
   });
 
   // SRM is an optional feature. Whether it is implemented is up to the
-  // discretion of OEMs
-  if (status == OEMCrypto_ERROR_NOT_IMPLEMENTED) {
-    LOGV("OEMCrypto_GetCurrentSRMVersion not implemented");
-    return NOT_IMPLEMENTED_ERROR;
-  }
-
+  // discretion of OEMs.  OEMs may implement this method, but SRM is not
+  // required if there is only a local display, as such no SRM version
+  // is available/reportable.  |srm_version| is only set if SUCCESS is
+  // returned.
+  switch (status) {
+    case OEMCrypto_SUCCESS:
+      return NO_ERROR;
+    case OEMCrypto_LOCAL_DISPLAY_ONLY:
+      LOGD("No SRM: Local display only");
+      return NO_SRM_VERSION;
+    case OEMCrypto_ERROR_NOT_IMPLEMENTED:
+      LOGD("No SRM: Not implemented");
+      return NO_SRM_VERSION;
+    default:
       return MapOEMCryptoResult(status, GET_SRM_VERSION_ERROR,
                                 "GetCurrentSRMVersion");
   }
+}
 
 bool CryptoSession::IsSrmUpdateSupported() {
   LOGV("Checking if SRM update is supported");
-  if (!IsInitialized()) return false;
+  RETURN_IF_UNINITIALIZED(false);
   return WithOecReadLock("IsSrmUpdateSupported",
                          [&] { return OEMCrypto_IsSRMUpdateSupported(); });
 }
@@ -1944,9 +1952,8 @@ CdmResponseType CryptoSession::LoadSrm(const std::string& srm) {
     return INVALID_SRM_LIST;
   }
 
-  OEMCryptoResult status;
-  WithOecWriteLock("LoadSrm", [&] {
-    status = OEMCrypto_LoadSRM(reinterpret_cast<const uint8_t*>(srm.data()),
+  const OEMCryptoResult status = WithOecWriteLock("LoadSrm", [&] {
+    return OEMCrypto_LoadSRM(reinterpret_cast<const uint8_t*>(srm.data()),
                              srm.size());
   });
 

libwvdrmengine/cdm/core/test/test_printers.cpp

@@ -596,6 +596,9 @@ void PrintTo(const enum CdmResponseType& value, ::std::ostream* os) {
     case NO_MATCHING_ENTITLEMENT_KEY:
       *os << "NO_MATCHING_ENTITLEMENT_KEY";
       break;
+    case NO_SRM_VERSION:
+      *os << "NO_SRM_VERSION";
+      break;
     case NONCE_GENERATION_ERROR:
       *os << "NONCE_GENERATION_ERROR";
       break;

libwvdrmengine/include/WVErrors.h

@@ -297,10 +297,11 @@ enum {
   kLicenseUsageEntryMissing = ERROR_DRM_VENDOR_MIN + 312,
   kLoadUsageEntryInvalidSession = ERROR_DRM_VENDOR_MIN + 313,
   kRestoreOfflineLicenseError3 = ERROR_DRM_VENDOR_MIN + 314,
+  kNoSrmVersion = ERROR_DRM_VENDOR_MIN + 315,
 
   // This should always follow the last error code.
   // The offset value should be updated each time a new error code is added.
-  kErrorWVDrmMaxErrorUsed = ERROR_DRM_VENDOR_MIN + 314,
+  kErrorWVDrmMaxErrorUsed = ERROR_DRM_VENDOR_MIN + 315,
 
   // Used by crypto test mode
   kErrorTestMode = ERROR_DRM_VENDOR_MAX,

libwvdrmengine/include/mapErrors-inl.h

@@ -402,6 +402,8 @@ static android::status_t mapCdmResponseType(wvcdm::CdmResponseType res) {
       return kNoContentKey2;
     case wvcdm::NO_DEVICE_KEY_1:
       return kNoDeviceKey1;
+    case wvcdm::NO_SRM_VERSION:
+      return kNoSrmVersion;
     case wvcdm::NO_USAGE_ENTRIES:
       return kNoUsageEntries;
     case wvcdm::OFFLINE_LICENSE_PROHIBITED:

libwvdrmengine/include_hidl/mapErrors-inl.h

@@ -356,6 +356,7 @@ static Status mapCdmResponseType(wvcdm::CdmResponseType res) {
     case wvcdm::SHRINK_USAGE_TABLE_HEADER_ENTRY_IN_USE:
     case wvcdm::LICENSE_USAGE_ENTRY_MISSING:
     case wvcdm::PROVISIONING_NOT_ALLOWED_FOR_ATSC:
+    case wvcdm::NO_SRM_VERSION:
       ALOGW("Returns UNKNOWN error for legacy status: %d", res);
       return Status::ERROR_DRM_UNKNOWN;