рендерить на картинке с грамотой имя ученика перед отправкой

apps/notification/tasks.py

@@ -1,10 +1,14 @@
+import os
 from datetime import datetime
+from PIL import Image
+from PIL import ImageFont
+from PIL import ImageDraw
 
 from django.contrib.auth import get_user_model
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.staticfiles.storage import staticfiles_storage
 from django.utils.timezone import now
-from django.db.models import Max
+from django.conf import settings
 
 from apps.notification.models import UserNotification
 from apps.notification.utils import send_email
@@ -17,11 +21,31 @@ from project.sengrid import get_sendgrid_client
 User = get_user_model()
 
 
+def draw_cert(path, email, first_name, last_name):
+    img = Image.open(path)
+    draw = ImageDraw.Draw(img)
+    font = ImageFont.truetype("/app/Microsoft Sans Serif.ttf", 92)
+    text = "награждается " + first_name
+    if last_name:
+        text += ' ' + last_name
+    w, h = draw.textsize(text, font=font)
+    draw.text(((img.width - w) // 2, 750), text, (29, 115, 224), font=font)
+    fn = os.path.join(settings.MEDIA_ROOT, 'tmp')
+    try:
+        os.mkdir(fn)
+    except:
+        pass
+    fn = os.path.join(fn, 'certificate-for-%s.jpg' % email)
+    img.save(fn)
+    img.close()
+    return fn
+
 @app.task
 def send_certificates(email=None, date=None, dry_run=False):
     path_pattern = 'img/user-certificates/%d.jpg'
     if email:
-        file = open(staticfiles_storage.path(path_pattern % 1), 'rb')
+        fn = draw_cert(staticfiles_storage.path(path_pattern % 1), email, 'Имя', 'Фамилия')
+        file = open(fn, 'rb')
         try:
             send_email('Грамота от Lil School', email, 'notification/email/certificate.html',
                        attachments=[(file.name, file.read(), 'image/jpeg')])
@@ -31,6 +55,7 @@ def send_certificates(email=None, date=None, dry_run=False):
             print('Email has been sent')
         finally:
             file.close()
+            os.remove(fn)
             return
 
     date = datetime.strptime(date, '%d-%m-%Y').date() if date else now().date()
@@ -52,7 +77,10 @@ def send_certificates(email=None, date=None, dry_run=False):
         un.certificate_number = un.certificate_number + 1 \
             if un.certificate_number and staticfiles_storage.exists(path_pattern % (un.certificate_number + 1)) \
             else 1
-        file = open(staticfiles_storage.path(path_pattern % un.certificate_number), 'rb')
+        fn = staticfiles_storage.path(path_pattern % un.certificate_number)
+        if un.user.child_first_name:
+            fn = draw_cert(fn, un.user.email, un.user.child_first_name, un.user.child_last_name)
+        file = open(fn, 'rb')
         try:
             send_email('Грамота от Lil School', un.user.email, 'notification/email/certificate.html',
                        attachments=[(file.name, file.read(), 'image/jpeg')], user_notification=un)
@@ -61,6 +89,8 @@ def send_certificates(email=None, date=None, dry_run=False):
             continue
         finally:
             file.close()
+            if un.user.child_first_name:
+                os.remove(fn)
         un.certificate_last_email = now()
         un.save()