#12 Started implementing email notifications

EmailSender class was created which sends the image to the given receiver. The class constructor receives the camera number and data from the camera in byte format, saves the image to temp folder and sends an email with the image as attachment.
Until a better solution is found, the email is sent from newly created gmail account and through gmail's SMTP server.

server/app.py

@@ -1,5 +1,6 @@
 from flask import Flask, render_template, Response, jsonify
 from modules.Detector import Detector
+from modules.EmailSender import EmailSender
 import socket, sys, signal
 
 # FLASK CONFIG
@@ -36,10 +37,15 @@ def receive_signal(signal_number, frame):
 
 def rec(sock, camera_num):
     global face_detected
+    email_sent = False
     while True:
         data, addr = sock.recvfrom(65535)
         if(detector.find_faces(data)):
             face_detected[camera_num] = True
+            if(email_sent == False):
+                sender = EmailSender(camera_num, data)
+                sender.send_email('kristoficmiro0@gmail.com')
+                email_sent = True
         else:
             face_detected[camera_num] = False
         yield (b'--frame\r\n'

server/modules/EmailSender.py

@@ -0,0 +1,55 @@
+import cv2
+import numpy as np
+import smtplib
+from email.mime.multipart import MIMEMultipart
+from email.mime.text import MIMEText
+from email.mime.base import MIMEBase
+from email import encoders
+from datetime import datetime
+
+class EmailSender(object):
+
+    def __init__(self, camera_num, img_data):
+        self.data = img_data
+        self.camera_num = camera_num
+
+    def send_email(self, receiver_mail):
+        filename = 'face.jpg'
+        path = '/tmp/' + filename
+        sender = "sissurvailance@gmail.com"
+        receiver = receiver_mail
+        nparr = np.fromstring(self.data, np.uint8)
+        img_np = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
+        cv2.imwrite(path, img_np)
+
+        now = datetime.now()
+        date_and_time = now.strftime("%d.%m.%Y. %H:%M:%S")
+
+        msg = MIMEMultipart()
+        msg['From'] = sender
+        msg['To'] = receiver
+        msg['Subject'] = "Face detected"
+        body = f"At {date_and_time}, camera #{self.camera_num} detected a face. Find attached image with the detected face."
+        msg.attach(MIMEText(body, 'plain'))
+
+        attachment = open("/tmp/face.jpg", "rb")
+        p = MIMEBase('application', 'octet-stream')
+        p.set_payload((attachment).read())
+        encoders.encode_base64(p)
+        p.add_header('Content-Disposition', "attachment; filename= %s" % filename)
+        msg.attach(p)
+
+        username = "sissurvailance@gmail.com"
+        password = "fw#22xCz"
+
+        try:
+            smtpObj = smtplib.SMTP('smtp.gmail.com', 587)
+            smtpObj.ehlo()
+            smtpObj.starttls()
+            smtpObj.login(username, password)
+            text = msg.as_string()
+            smtpObj.sendmail(sender, receiver, text)
+            smtpObj.quit()
+            print(f"Email sent to {receiver}.")
+        except Exception as e:
+            print("Unable to send the email.")