Initial additional method for device

device.go

@@ -0,0 +1,66 @@
+package onvif
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"regexp"
+	"time"
+
+	"github.com/clbanning/mxj"
+)
+
+var httpClient = &http.Client{
+	Timeout: time.Second * 5,
+}
+
+// Device contains data of ONVIF camera
+type Device struct {
+	ID       string
+	Name     string
+	XAddr    string
+	User     string
+	Password string
+}
+
+// GetSystemDateAndTime fetch date and time from ONVIF camera
+func (device Device) GetSystemDateAndTime() (string, error) {
+	// Create request
+	request := `<?xml version="1.0" encoding="UTF-8"?>
+		<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope">
+			<s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+				<GetSystemDateAndTime xmlns="http://www.onvif.org/ver10/device/wsdl"/>
+			</s:Body>
+		</s:Envelope>`
+
+	request = regexp.MustCompile(`\>\s+\<`).ReplaceAllString(request, "><")
+	request = regexp.MustCompile(`\s+`).ReplaceAllString(request, " ")
+
+	// Create request
+	buffer := bytes.NewBuffer([]byte(request))
+	req, err := http.NewRequest("POST", device.XAddr, buffer)
+	req.Header.Set("Content-Type", "application/soap+xml")
+	req.Header.Set("Charset", "utf-8")
+
+	// Send request
+	resp, err := httpClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	// Read response body
+	responseBody, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	// Parse XML to map
+	mapXML, err := mxj.NewMapXml(responseBody)
+	if err != nil {
+		return "", err
+	}
+
+	dateTime, _ := mapXML.ValueForPathString("Envelope.Body.GetSystemDateAndTimeResponse.SystemDateAndTime")
+	return dateTime, nil
+}

model.go

@@ -1,10 +0,0 @@
-package onvif
-
-// Device contains data of Onvif device
-type Device struct {
-	ID       string
-	Name     string
-	XAddrs   []string
-	User     string
-	Password string
-}