protocol/packet: pair packet wrappers

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>

protocol/packet/pair.go

@@ -0,0 +1,36 @@
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+package packet
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type Pair struct {
+	Pair bool `json:"pair"`
+}
+
+func NewPair() *Packet {
+	return New("kdeconnect.pair", Pair{Pair: true})
+}
+
+func (p *Packet) AsPair() (*Pair, error) {
+	if p.Type != "kdeconnect.pair" {
+		return nil, fmt.Errorf("not a pair packet, unexpected type %q", p.Type)
+	}
+	var pair Pair
+	if err := json.Unmarshal(p.Body, &pair); err != nil {
+		return nil, err
+	}
+	return &pair, nil
+}