internal/gomote: add object name to UploadFile endpoint

This change adds the object name as one of the fields returned to the
caller. The object name is not included in the URL. The object name is
required for any subsequent calls needed to pass the file along to the
gomote instances.

For golang/go#47521
Updates golang/go#48742

Change-Id: I5437ab2029907460806f2f3b6a19f6dec22115da
Reviewed-on: https://go-review.googlesource.com/c/build/+/405535
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
diff --git a/internal/gomote/gomote.go b/internal/gomote/gomote.go
index 5bf86ab..d3986c3 100644
--- a/internal/gomote/gomote.go
+++ b/internal/gomote/gomote.go
@@ -401,14 +401,16 @@
 	if err != nil {
 		return nil, status.Errorf(codes.Unauthenticated, "request does not contain the required authentication")
 	}
-	url, fields, err := s.signURLForUpload(uuid.NewString())
+	objectName := uuid.NewString()
+	url, fields, err := s.signURLForUpload(objectName)
 	if err != nil {
 		log.Printf("unable to create signed URL: %s", err)
 		return nil, status.Errorf(codes.Internal, "unable to create signed url")
 	}
 	return &protos.UploadFileResponse{
-		Url:    url,
-		Fields: fields,
+		Url:        url,
+		Fields:     fields,
+		ObjectName: objectName,
 	}, nil
 }
 
diff --git a/internal/gomote/protos/gomote.pb.go b/internal/gomote/protos/gomote.pb.go
index d372ef6..27ad233 100644
--- a/internal/gomote/protos/gomote.pb.go
+++ b/internal/gomote/protos/gomote.pb.go
@@ -1272,6 +1272,8 @@
 	Url string `protobuf:"bytes,1,opt,name=url,proto3" json:"url,omitempty"`
 	// Form fields used when http posting files to GCS.
 	Fields map[string]string `protobuf:"bytes,2,rep,name=fields,proto3" json:"fields,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Name used to reference the object.
+	ObjectName string `protobuf:"bytes,3,opt,name=object_name,json=objectName,proto3" json:"object_name,omitempty"`
 }
 
 func (x *UploadFileResponse) Reset() {
@@ -1320,6 +1322,13 @@
 	return nil
 }
 
+func (x *UploadFileResponse) GetObjectName() string {
+	if x != nil {
+		return x.ObjectName
+	}
+	return ""
+}
+
 // WriteFileFromURLRequest specifies the data needed to request that a gomote download the contents of a URL and place
 // the contents in a file.
 type WriteFileFromURLRequest struct {
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 }
 
 var (
diff --git a/internal/gomote/protos/gomote.proto b/internal/gomote/protos/gomote.proto
index 9db440f..eb87d63 100644
--- a/internal/gomote/protos/gomote.proto
+++ b/internal/gomote/protos/gomote.proto
@@ -210,6 +210,8 @@
   string url = 1;
   // Form fields used when http posting files to GCS.
   map<string, string> fields = 2;
+  // Name used to reference the object.
+  string object_name = 3;
 }
 
 // WriteFileFromURLRequest specifies the data needed to request that a gomote download the contents of a URL and place