implemented "sendContacts" functionality

see #416

src/api/api.go

@@ -1623,3 +1623,27 @@ func (a *Api) GetTrustMode(c *gin.Context) {
 
 	c.JSON(200, trustMode)
 }
+
+// @Summary Send a synchronization message with the local contacts list to all linked devices.
+// @Tags Contacts
+// @Description Send a synchronization message with the local contacts list to all linked devices. This command should only be used if this is the primary device.
+// @Accept  json
+// @Produce  json
+// @Param number path string true "Registered Phone Number"
+// @Success 204
+// @Failure 400 {object} Error
+// @Router /v1/contacts{number}/sync [post]
+func (a *Api) SendContacts(c *gin.Context) {
+	number := c.Param("number")
+	if number == "" {
+		c.JSON(400, Error{Msg: "Couldn't process request - number missing"})
+		return
+	}
+
+	err := a.signalClient.SendContacts(number)
+	if err != nil {
+		c.JSON(400, Error{Msg: err.Error()})
+		return
+	}
+	c.Status(http.StatusNoContent)
+}

src/client/client.go

@@ -1582,6 +1582,21 @@ func (s *SignalClient) SearchForNumbers(number string, numbers []string) ([]Sear
 	return searchResultEntries, err
 }
 
+func (s* SignalClient) SendContacts(number string) error {
+	var err error
+	if s.signalCliMode == JsonRpc {
+		jsonRpc2Client, err := s.getJsonRpc2Client(number)
+		if err != nil {
+			return err
+		}
+		_, err = jsonRpc2Client.getRaw("sendContacts", nil)
+	} else {
+		cmd := []string{"--config", s.signalCliConfig, "-a", number, "sendContacts"}
+		_, err = s.cliClient.Execute(true, cmd, "")
+	}
+	return err
+}
+
 func (s *SignalClient) UpdateContact(number string, recipient string, name *string, expirationInSeconds *int) error {
 	var err error
 	if s.signalCliMode == JsonRpc {

src/main.go

@@ -242,6 +242,7 @@ func main() {
 		contacts := v1.Group("/contacts")
 		{
 			contacts.PUT(":number", api.UpdateContact)
+			contacts.POST(":number/sync", api.SendContacts)
 		}
 	}