service/s3: Fix PutObject and UploadPart API to include ContentMD5 fi…

…eld (#1559)

Fixes the SDK's S3 PutObject and UploadPart API code generation to
correctly render the ContentMD5 field into the associated input types
for these two API operations.

Fix #1553

private/model/api/customization_passes.go

@@ -53,12 +53,20 @@ func (a *API) customizationPasses() {
 func s3Customizations(a *API) {
 	var strExpires *Shape
 
+	var keepContentMD5Ref = map[string]struct{}{
+		"PutObjectInput":  struct{}{},
+		"UploadPartInput": struct{}{},
+	}
+
 	for name, s := range a.Shapes {
-		// Remove ContentMD5 members
-		if _, ok := s.MemberRefs["ContentMD5"]; ok {
-			delete(s.MemberRefs, "ContentMD5")
+		// Remove ContentMD5 members unless specified otherwise.
+		if _, keep := keepContentMD5Ref[name]; !keep {
+			if _, have := s.MemberRefs["ContentMD5"]; have {
+				delete(s.MemberRefs, "ContentMD5")
+			}
 		}
 
+		// Generate getter methods for API operation fields used by customizations.
 		for _, refName := range []string{"Bucket", "SSECustomerKey", "CopySourceSSECustomerKey"} {
 			if ref, ok := s.MemberRefs[refName]; ok {
 				ref.GenerateGetter = true

service/s3/s3manager/upload.go

@@ -117,6 +117,9 @@ type UploadInput struct {
 	// The language the content is in.
 	ContentLanguage *string `location:"header" locationName:"Content-Language" type:"string"`
 
+	// The base64-encoded 128-bit MD5 digest of the part data.
+	ContentMD5 *string `location:"header" locationName:"Content-MD5" type:"string"`
+
 	// A standard MIME type describing the format of the object data.
 	ContentType *string `location:"header" locationName:"Content-Type" type:"string"`