Base64-decode default blob values

Author: lauzadis

codegen/smithy-aws-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/aws/protocols/core/AwsHttpBindingProtocolGenerator.kt

@@ -41,8 +41,6 @@ abstract class AwsHttpBindingProtocolGenerator : HttpBindingProtocolGenerator()
 
         val ignoredTests = TestMemberDelta(
             setOf(
-                "AwsJson10ClientErrorCorrectsWithDefaultValuesWhenServerFailsToSerializeRequiredValues", // FIXME Protocol test seems to be wrong. Default value of the member is "YmxvYg==" but they are expecting it to be decoded "blob".
-                "RpcV2CborClientPopulatesDefaultsValuesWhenMissingInResponse", // FIXME Protocol test seems to be wrong. Default value of member is "YWJj" but they are expecting it to be decoded "abc".
                 "RpcV2CborClientPopulatesDefaultValuesInInput", // FIXME Bug in protocol test, malformed Base64 body. Fix will be in the next Smithy release: https://github.com/smithy-lang/smithy/pull/2502
             ),
         )

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/core/KotlinSymbolProvider.kt

@@ -241,7 +241,7 @@ class KotlinSymbolProvider(private val model: Model, private val settings: Kotli
                     .takeUnless { it.isEmpty() }
                     ?.let { "ByteStream.fromString(${it.dq()})" }
 
-            targetShape.isBlobShape -> "${node.toString().dq()}.encodeToByteArray()"
+            targetShape.isBlobShape -> "${node.toString().dq()}.decodeBase64().encodeToByteArray()"
 
             targetShape.isDocumentShape -> getDefaultValueForDocument(node)
             targetShape.isTimestampShape -> getDefaultValueForTimestamp(node.asNumberNode().get())

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/rendering/StructureGenerator.kt

@@ -248,6 +248,11 @@ class StructureGenerator(
                     } else {
                         memberSymbol
                     }
+
+                    if (builderMemberSymbol.shape is BlobShape && builderMemberSymbol.isNotNullable) {
+                        writer.addImport(RuntimeTypes.Core.Text.Encoding.decodeBase64)
+                    }
+
                     write("public var #L: #E", memberName, builderMemberSymbol)
                 }
                 write("")