From a758e667827df48f8da07bd9195f1b16ea22fd09 Mon Sep 17 00:00:00 2001
From: Dimas Ciputra <dimas.ciputra@gmail.com>
Date: Thu, 21 Nov 2024 22:05:59 +0000
Subject: [PATCH] Add resend email backend (#166)

---
 core/email_backend.py | 94 +++++++++++++++++++++++++++++++++++++++++++
 core/settings/core.py |  8 +++-
 2 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 core/email_backend.py

diff --git a/core/email_backend.py b/core/email_backend.py
new file mode 100644
index 0000000..ccaff86
--- /dev/null
+++ b/core/email_backend.py
@@ -0,0 +1,94 @@
+import base64
+import mimetypes
+
+import requests
+from django.core.mail.backends.base import BaseEmailBackend
+from django.conf import settings
+
+DEFAULT_FROM_EMAIL = settings.DEFAULT_FROM_EMAIL
+RESEND_API_KEY = settings.RESEND_API_KEY
+
+
+class ResendBackend(BaseEmailBackend):
+    """
+    A Django email backend that uses the Resend API.
+    """
+    def send_messages(self, email_messages):
+        """
+        Send a list of email messages using the Resend API.
+        :param email_messages: List of Django email messages.
+        :return: The number of successfully sent messages.
+        """
+        count = 0
+
+        for email in email_messages:
+            response = self._send_via_resend(email)
+
+            if response.status_code == 200:
+                count += 1
+
+        return count
+
+    def _send_via_resend(self, email):
+        """
+        Send a single email via Resend.
+        :param email: A Django EmailMessage object.
+        :return: The response from the Resend API.
+        """
+        resend_api_key = RESEND_API_KEY
+        from_email = (
+            DEFAULT_FROM_EMAIL if
+            DEFAULT_FROM_EMAIL else
+            email.from_email
+        )
+
+        # Prepare the payload for the Resend API request
+        payload = {
+            "from": from_email,
+            "to": email.to,
+            "subject": email.subject,
+            "text": email.body,
+        }
+
+        if email.content_subtype == "html":
+            payload["html"] = email.body
+
+        # Check for HTML content
+        if email.alternatives:
+            for alternative in email.alternatives:
+                content_type, content = alternative
+                if content_type == "text/html":
+                    payload["html"] = content
+
+        attachments = []
+
+        for attachment in email.attachments:
+            if isinstance(attachment, tuple):
+                filename, content, mime_type = attachment
+                encoded_content = base64.b64encode(content).decode("utf-8")
+            else:
+                filename = attachment
+                with open(attachment, "rb") as f:
+                    content = f.read()
+                mime_type, _ = mimetypes.guess_type(filename)
+                encoded_content = base64.b64encode(content).decode("utf-8")
+
+            attachments.append({
+                "filename": filename,
+                "content": encoded_content,
+                "content_type": mime_type,
+            })
+
+        if attachments:
+            payload["attachments"] = attachments
+
+        # Prepare headers
+        headers = {
+            "Authorization": f"Bearer {resend_api_key}",
+            "Content-Type": "application/json",
+        }
+
+        # Make the request to the Resend API
+        resend_url = "https://api.resend.com/emails"
+        response = requests.post(resend_url, json=payload, headers=headers)
+        return response
\ No newline at end of file
diff --git a/core/settings/core.py b/core/settings/core.py
index c3a3048..ae2d136 100644
--- a/core/settings/core.py
+++ b/core/settings/core.py
@@ -189,7 +189,7 @@
 
 LOGIN_REDIRECT_URL = '/'
 
-EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
+EMAIL_BACKEND = 'core.email_backend.ResendBackend'
 ACCOUNT_EMAIL_REQUIRED = True
 
 DBBACKUP_STORAGE_OPTIONS = {'location': 'backups'}
@@ -200,3 +200,9 @@
         "LOCATION": absolute_path('core', 'cache'),
     }
 }
+
+DEFAULT_FROM_EMAIL = os.environ.get(
+    'DEFAULT_FROM_EMAIL',
+    'noreply@noreply.kartoza.com')
+RESEND_API_KEY = os.environ.get(
+    'RESEND_API_KEY', '')