Add new module to send email for verification

1 files changed, 55 insertions, 0 deletions

diff --git a/yaksh/email_verification.py b/yaksh/email_verification.py
new file mode 100644
index 0000000..4eded1c
--- /dev/null
+++ b/yaksh/email_verification.py
@@ -0,0 +1,55 @@
+# Local imports
+try:
+    from string import letters
+except ImportError:
+    from string import ascii_letters as letters
+from string import digits, punctuation
+# Local imports
+import hashlib
+from random import randint
+from textwrap import dedent
+
+# Django imports
+from django.utils.crypto import get_random_string
+from django.core.mail import send_mail
+from django.conf import settings
+
+def generate_activation_key(username):
+    """ Generate hashed secret key for email activation """
+    chars = letters + digits + punctuation
+    secret_key = get_random_string(randint(10, 40), chars)
+    return hashlib.sha256((secret_key + username).encode('utf-8')).hexdigest()
+
+def send_user_mail(user_mail, key):
+    """ Send mail to user whose email is to be verified
+        This function should get two args i.e user_email and secret_key.
+        The activation url is generated from settings.PRODUCTION_URL and key.
+    """
+    try:
+        to = user_mail
+        subject = "Yaksh Email Verification"
+        msg = dedent("""\
+                To activate your account and verify your email address,
+                please click the following link:
+                {0}/exam/activate/{1}
+                If clicking the link above does not work,
+                copy and paste the URL in a new browser window instead.
+                For any issue, please write us on {2}
+
+                Regards
+                Yaksh Team
+            """.format(settings.PRODUCTION_URL, key, settings.REPLY_EMAIL)
+            )
+
+        send_mail(subject, msg, settings.SENDER_EMAIL, [to])
+        msg = "An activation link is sent to your registered email.\
+                        Please activate the link within 20 minutes."
+        success = True
+    except Exception as exc_msg:
+        msg = """Error: {0}. Please check your email address.\
+                If email address is correct then
+                Please contact your \
+                instructor/administrator.""".format(exc_msg)
+        success = False
+
+    return success, msg