Getblockhash and getblock template

Fix some type wranging in unmarshal for getblocktemplate

jsoncmd.go

@@ -1853,11 +1853,20 @@ func (cmd *GetBlockTemplateCmd) UnmarshalJSON(b []byte) error {
 
 		capabilities, ok := rmap["capabilities"]
 		if ok {
-			scap, ok := capabilities.([]string)
+			icap, ok := capabilities.([]interface{})
 			if !ok {
-				return errors.New("TemplateRequest mode must be a string array")
+				return errors.New("TemplateRequest mode must be an array")
 			}
-			trequest.Capabilities = scap
+
+			cap := make([]string, len(icap))
+			for i, val := range icap {
+				cap[i], ok = val.(string)
+				if !ok {
+					return errors.New("TemplateRequest mode must be an aray of strings")
+				}
+			}
+
+			trequest.Capabilities = cap
 		}
 
 		optArgs = append(optArgs, trequest)

jsoncmd_test.go

@@ -304,6 +304,62 @@ var jsoncmdtests = []struct {
 			id: float64(1),
 		},
 	},
+	{
+		name: "basic getblockhash",
+		f: func() (Cmd, error) {
+			return NewGetBlockHashCmd(float64(1), 1234)
+		},
+		result: &GetBlockHashCmd{
+			id: float64(1),
+			Index: 1234,
+		},
+	},
+	{
+		name: "basic getblocktemplate",
+		f: func() (Cmd, error) {
+			return NewGetBlockTemplateCmd(float64(1))
+		},
+		result: &GetBlockTemplateCmd{
+			id: float64(1),
+		},
+	},
+	{
+		name: "basic getblocktemplate + request",
+		f: func() (Cmd, error) {
+			return NewGetBlockTemplateCmd(float64(1),
+				&TemplateRequest{Mode:"mode",
+				Capabilities: []string{"one", "two", "three"}})
+		},
+		result: &GetBlockTemplateCmd{
+			id: float64(1),
+			Request:	&TemplateRequest{
+				Mode:"mode",
+				Capabilities: []string{
+					"one",
+					"two",
+					"three",
+				},
+			},
+		},
+	},
+	{
+		name: "basic getblocktemplate + request no mode",
+		f: func() (Cmd, error) {
+			return NewGetBlockTemplateCmd(float64(1),
+				&TemplateRequest{
+				Capabilities: []string{"one", "two", "three"}})
+		},
+		result: &GetBlockTemplateCmd{
+			id: float64(1),
+			Request:	&TemplateRequest{
+				Capabilities: []string{
+					"one",
+					"two",
+					"three",
+				},
+			},
+		},
+	},
 	{
 		name: "basic ping",
 		f: func() (Cmd, error) {