Fix empty string int marshalling in go 1.14

unifi/json.go

@@ -0,0 +1,33 @@
+package unifi
+
+import (
+	"strconv"
+	"strings"
+)
+
+// emptyStringInt was created due to the behavior change in
+// Go 1.14 with json.Number's handling of empty string.
+type emptyStringInt int
+
+func (e *emptyStringInt) UnmarshalJSON(b []byte) error {
+	if len(b) == 0 {
+		return nil
+	}
+	if string(b) == `""` {
+		return nil
+	}
+	var err error
+	s := string(b)
+	if strings.HasPrefix(s, `"`) && strings.HasSuffix(s, `"`) {
+		s, err = strconv.Unquote(s)
+		if err != nil {
+			return err
+		}
+	}
+	i, err := strconv.Atoi(s)
+	if err != nil {
+		return err
+	}
+	*e = emptyStringInt(i)
+	return nil
+}

unifi/network.go

@@ -9,35 +9,21 @@ import (
 func (dst *Network) UnmarshalJSON(b []byte) error {
 	type Alias Network
 	aux := &struct {
-		VLAN           json.Number `json:"vlan"`
-		DHCPDLeaseTime json.Number `json:"dhcpd_leasetime"`
+		VLAN           emptyStringInt `json:"vlan"`
+		DHCPDLeaseTime emptyStringInt `json:"dhcpd_leasetime"`
 
 		*Alias
 	}{
 		Alias: (*Alias)(dst),
 	}
+
 	err := json.Unmarshal(b, &aux)
 	if err != nil {
-		return err
+		return fmt.Errorf("unable to unmarshal alias: %w", err)
 	}
 
-	dst.VLAN = 0
-	if aux.VLAN.String() != "" {
-		n, err := aux.VLAN.Int64()
-		if err != nil {
-			return err
-		}
-		dst.VLAN = int(n)
-	}
-
-	dst.DHCPDLeaseTime = 0
-	if aux.DHCPDLeaseTime.String() != "" {
-		n, err := aux.DHCPDLeaseTime.Int64()
-		if err != nil {
-			return err
-		}
-		dst.DHCPDLeaseTime = int(n)
-	}
+	dst.VLAN = int(aux.VLAN)
+	dst.DHCPDLeaseTime = int(aux.DHCPDLeaseTime)
 
 	return nil
 }

unifi/network_test.go

@@ -0,0 +1,53 @@
+package unifi_test
+
+import (
+	"encoding/json"
+	"reflect"
+	"testing"
+
+	"github.com/paultyng/go-unifi/unifi"
+)
+
+func TestNetworkUnmarshalJSON(t *testing.T) {
+	for n, c := range map[string]struct {
+		expected unifi.Network
+		json     string
+	}{
+		"int vlan": {
+			expected: unifi.Network{VLAN: 1},
+			json:     `{ "vlan": 1 }`,
+		},
+		"string vlan": {
+			expected: unifi.Network{VLAN: 1},
+			json:     `{ "vlan": "1" }`,
+		},
+		"empty string vlan": {
+			expected: unifi.Network{VLAN: 0},
+			json:     `{ "vlan": "" }`,
+		},
+
+		"int dhcpd_leasetime": {
+			expected: unifi.Network{DHCPDLeaseTime: 1},
+			json:     `{ "dhcpd_leasetime": 1 }`,
+		},
+		"string dhcpd_leasetime": {
+			expected: unifi.Network{DHCPDLeaseTime: 1},
+			json:     `{ "dhcpd_leasetime": "1" }`,
+		},
+		"empty string dhcpd_leasetime": {
+			expected: unifi.Network{DHCPDLeaseTime: 0},
+			json:     `{ "dhcpd_leasetime": "" }`,
+		},
+	} {
+		t.Run(n, func(t *testing.T) {
+			var actual unifi.Network
+			err := json.Unmarshal(([]byte)(c.json), &actual)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if !reflect.DeepEqual(c.expected, actual) {
+				t.Fatalf("not equal:\nexpected: %#v\nactual: %#v", c.expected, actual)
+			}
+		})
+	}
+}

unifi/wlan.go

@@ -8,23 +8,19 @@ import (
 func (n *WLAN) UnmarshalJSON(b []byte) error {
 	type Alias WLAN
 	aux := &struct {
-		VLAN json.Number `json:"vlan"`
+		VLAN emptyStringInt `json:"vlan"`
 		*Alias
 	}{
 		Alias: (*Alias)(n),
 	}
+
 	err := json.Unmarshal(b, &aux)
 	if err != nil {
 		return err
 	}
-	n.VLAN = 0
-	if aux.VLAN.String() != "" {
-		vlan, err := aux.VLAN.Int64()
-		if err != nil {
-			return err
-		}
-		n.VLAN = int(vlan)
-	}
+
+	n.VLAN = int(aux.VLAN)
+
 	return nil
 }
 

unifi/wlan_group.go

@@ -8,23 +8,19 @@ import (
 func (n *WLANGroup) UnmarshalJSON(b []byte) error {
 	type Alias WLANGroup
 	aux := &struct {
-		Maxsta json.Number `json:"maxsta"`
+		Maxsta emptyStringInt `json:"maxsta"`
 		*Alias
 	}{
 		Alias: (*Alias)(n),
 	}
+
 	err := json.Unmarshal(b, &aux)
 	if err != nil {
 		return err
 	}
-	n.Maxsta = 0
-	if aux.Maxsta.String() != "" {
-		maxsta, err := aux.Maxsta.Int64()
-		if err != nil {
-			return err
-		}
-		n.Maxsta = int(maxsta)
-	}
+
+	n.Maxsta = int(aux.Maxsta)
+
 	return nil
 }