secrets/database: Fixes marshalling bug for json.Number types (#11451)

changelog/11451.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+secrets/database: Fix marshalling to allow providing numeric arguments to external database plugins.
+```

sdk/database/dbplugin/v5/grpc_client_test.go

@@ -2,6 +2,7 @@ package dbplugin
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"reflect"
 	"testing"
@@ -62,6 +63,29 @@ func TestGRPCClient_Initialize(t *testing.T) {
 			},
 			assertErr: assertErrNil,
 		},
+		"JSON number type in initialize request": {
+			client: fakeClient{
+				initResp: &proto.InitializeResponse{
+					ConfigData: marshal(t, map[string]interface{}{
+						"foo": "bar",
+						"max": "10",
+					}),
+				},
+			},
+			req: InitializeRequest{
+				Config: map[string]interface{}{
+					"foo": "bar",
+					"max": json.Number("10"),
+				},
+			},
+			expectedResp: InitializeResponse{
+				Config: map[string]interface{}{
+					"foo": "bar",
+					"max": "10",
+				},
+			},
+			assertErr: assertErrNil,
+		},
 	}
 
 	for name, test := range tests {

sdk/database/dbplugin/v5/marshalling.go

@@ -1,12 +1,26 @@
 package dbplugin
 
 import (
+	"encoding/json"
 	"math"
 
 	"google.golang.org/protobuf/types/known/structpb"
 )
 
 func mapToStruct(m map[string]interface{}) (*structpb.Struct, error) {
+	// Convert any json.Number typed values to float64, since the
+	// type does not have a conversion mapping defined in structpb
+	for k, v := range m {
+		if n, ok := v.(json.Number); ok {
+			nf, err := n.Float64()
+			if err != nil {
+				return nil, err
+			}
+
+			m[k] = nf
+		}
+	}
+
 	return structpb.NewStruct(m)
 }
 

vendor/github.com/hashicorp/vault/sdk/database/dbplugin/v5/marshalling.go

@@ -1,12 +1,26 @@
 package dbplugin
 
 import (
+	"encoding/json"
 	"math"
 
 	"google.golang.org/protobuf/types/known/structpb"
 )
 
 func mapToStruct(m map[string]interface{}) (*structpb.Struct, error) {
+	// Convert any json.Number typed values to float64, since the
+	// type does not have a conversion mapping defined in structpb
+	for k, v := range m {
+		if n, ok := v.(json.Number); ok {
+			nf, err := n.Float64()
+			if err != nil {
+				return nil, err
+			}
+
+			m[k] = nf
+		}
+	}
+
 	return structpb.NewStruct(m)
 }