[webcrypto] Make all of the crypto.subtle method failures asynchronous.

Source/modules/crypto/Key.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/crypto/Key.h"
 
 #include "bindings/v8/ExceptionState.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/crypto/Algorithm.h"
+#include "platform/CryptoResult.h"
 #include "public/platform/WebCryptoAlgorithmParams.h"
+#include "public/platform/WebString.h"
 
 namespace WebCore {
 
 DEFINE_GC_INFO(Key);
 
 namespace {
 
 const char* keyTypeToString(blink::WebCryptoKeyType type)
 {
     switch (type) {
@@ skipping 122 matching lines @@
 {
     Vector<String> result;
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(keyUsageMappings); ++i) {
         blink::WebCryptoKeyUsage usage = keyUsageMappings[i].value;
         if (m_key.usages() & usage)
             result.append(keyUsageToString(usage));
     }
     return result;
 }
 
-bool Key::canBeUsedForAlgorithm(const blink::WebCryptoAlgorithm& algorithm, AlgorithmOperation op, String& errorDetails) const
+bool Key::canBeUsedForAlgorithm(const blink::WebCryptoAlgorithm& algorithm, AlgorithmOperation op, CryptoResult* result) const
 {
     if (!(m_key.usages() & toKeyUsage(op))) {
-        errorDetails = "key.usages does not permit this operation";
+        result->completeWithError("key.usages does not permit this operation");
         return false;
     }
 
     if (m_key.algorithm().id() != algorithm.id()) {
-        errorDetails = "key.algorithm does not match that of operation";
+        result->completeWithError("key.algorithm does not match that of operation");
         return false;
     }
 
     // Verify that the algorithm-specific parameters for the key conform to the
     // algorithm.
     // FIXME: This is incomplete and not future proof. Operational parameters
     //        should be enumerated when defining new parameters.
 
     if (m_key.algorithm().id() == blink::WebCryptoAlgorithmIdHmac) {
         blink::WebCryptoAlgorithmId keyHash;
         blink::WebCryptoAlgorithmId algorithmHash;
         if (!getHmacHashId(m_key.algorithm(), keyHash) || !getHmacHashId(algorithm, algorithmHash) || keyHash != algorithmHash) {
-            errorDetails = "key.algorithm does not match that of operation (HMAC's hash differs)";
+            result->completeWithError("key.algorithm does not match that of operation (HMAC's hash differs)");
             return false;
         }
     }
 
     return true;
 }
 
-bool Key::parseFormat(const String& formatString, blink::WebCryptoKeyFormat& format, ExceptionState& exceptionState)
+bool Key::parseFormat(const String& formatString, blink::WebCryptoKeyFormat& format, CryptoResult* result)
 {
     // There are few enough values that testing serially is fast enough.
     if (formatString == "raw") {
         format = blink::WebCryptoKeyFormatRaw;
         return true;
     }
     if (formatString == "pkcs8") {
         format = blink::WebCryptoKeyFormatPkcs8;
         return true;
     }
     if (formatString == "spki") {
         format = blink::WebCryptoKeyFormatSpki;
         return true;
     }
     if (formatString == "jwk") {
         format = blink::WebCryptoKeyFormatJwk;
         return true;
     }
 
-    exceptionState.throwTypeError("Invalid keyFormat argument");
+    result->completeWithError("Invalid keyFormat argument");
     return false;
 }
 
-bool Key::parseUsageMask(const Vector<String>& usages, blink::WebCryptoKeyUsageMask& mask, ExceptionState& exceptionState)
+bool Key::parseUsageMask(const Vector<String>& usages, blink::WebCryptoKeyUsageMask& mask, CryptoResult* result)
 {
     mask = 0;
     for (size_t i = 0; i < usages.size(); ++i) {
         blink::WebCryptoKeyUsageMask usage = keyUsageStringToMask(usages[i]);
         if (!usage) {
-            exceptionState.throwTypeError("Invalid keyUsages argument");
+            result->completeWithError("Invalid keyUsages argument");
             return false;
         }
         mask |= usage;
     }
     return true;
 }
 
 void Key::trace(Visitor* visitor)
 {
     visitor->trace(m_algorithm);
 }
 
 } // namespace WebCore