Add linking support

cmd/signald-cli/cmd/link.go

@@ -0,0 +1,70 @@
+// Copyright © 2018 Finn Herzfeld <finn@janky.solutions>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"os"
+
+	"github.com/mdp/qrterminal"
+	"github.com/spf13/cobra"
+
+	"git.callpipe.com/finn/signald-go/signald"
+)
+
+var uriOrQR bool
+
+// linkCmd represents the link command
+var linkCmd = &cobra.Command{
+	Use:   "link",
+	Short: "Link to an existing Signal account",
+	Long:  `Get a URI or QR code to link to an existing Signal account`,
+	Run: func(cmd *cobra.Command, args []string) {
+		requestID := fmt.Sprint("signald-cli-", rand.Intn(1000))
+		s.SendRequest(signald.Request{
+			Type: "link",
+			ID:   requestID,
+		})
+
+		c := make(chan signald.Response)
+		go s.Listen(c)
+		for {
+			message := <-c
+			if message.ID == requestID {
+				switch message.Type {
+				case "linking_error":
+					log.Fatal(message.Data.Message)
+					os.Exit(1)
+					break
+
+				case "linking_uri":
+					if uriOrQR {
+						fmt.Println(message.Data.URI)
+					} else {
+						qrterminal.Generate(message.Data.URI, qrterminal.M, os.Stdout)
+					}
+				}
+			}
+		}
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(linkCmd)
+	linkCmd.Flags().BoolVarP(&uriOrQR, "uri", "u", false, "Print a URI instead of a QR code.")
+}

signald/signaldresponse.go

@@ -4,11 +4,14 @@ package signald
 type Response struct {
 	ID   string
 	Data ResponseData
+	Type string
 }
 
 // ResponseData is where most of the data in the response is stored.
 type ResponseData struct {
 	Groups  []Group
+	URI     string
+	Message string
 }
 
 // Group represents a group in signal