From 8e45656c8603531fcd61312a710261b99bba8dd1 Mon Sep 17 00:00:00 2001
From: Shariq Ansari <sharique.rik@gmail.com>
Date: Sun, 19 Jan 2025 22:25:23 +0530
Subject: [PATCH] fix: added webhook verify token for security

---
 .../crm_exotel_settings.json                  | 15 +++++++++++-
 crm/integrations/exotel/handler.py            | 23 +++++++++++++++++--
 2 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/crm/fcrm/doctype/crm_exotel_settings/crm_exotel_settings.json b/crm/fcrm/doctype/crm_exotel_settings/crm_exotel_settings.json
index 98382626d..a4fc1bf61 100644
--- a/crm/fcrm/doctype/crm_exotel_settings/crm_exotel_settings.json
+++ b/crm/fcrm/doctype/crm_exotel_settings/crm_exotel_settings.json
@@ -10,6 +10,8 @@
   "record_call",
   "section_break_kfez",
   "account_sid",
+  "column_break_qwfn",
+  "webhook_verify_token",
   "section_break_iuct",
   "api_key",
   "column_break_hyen",
@@ -70,12 +72,23 @@
    "fieldname": "record_call",
    "fieldtype": "Check",
    "label": "Record Call"
+  },
+  {
+   "fieldname": "column_break_qwfn",
+   "fieldtype": "Column Break"
+  },
+  {
+   "depends_on": "enabled",
+   "fieldname": "webhook_verify_token",
+   "fieldtype": "Data",
+   "label": "Webhook Verify Token",
+   "mandatory_depends_on": "enabled"
   }
  ],
  "index_web_pages_for_search": 1,
  "issingle": 1,
  "links": [],
- "modified": "2025-01-15 19:31:00.310049",
+ "modified": "2025-01-19 22:19:20.713970",
  "modified_by": "Administrator",
  "module": "FCRM",
  "name": "CRM Exotel Settings",
diff --git a/crm/integrations/exotel/handler.py b/crm/integrations/exotel/handler.py
index 7d3301a8c..4ffc00b47 100644
--- a/crm/integrations/exotel/handler.py
+++ b/crm/integrations/exotel/handler.py
@@ -1,5 +1,3 @@
-import json
-
 import bleach
 import frappe
 import requests
@@ -8,10 +6,20 @@
 
 from crm.integrations.api import get_contact_by_phone_number
 
+# Endpoints for webhook
+
+# Incoming Call:
+# <site>/api/method/crm.integrations.exotel.handler.handle_request?key=<exotel-webhook-verify-token>
+
+# Exotel Reference:
+# https://developer.exotel.com/api/
+# https://support.exotel.com/support/solutions/articles/48283-working-with-passthru-applet
+
 
 # Incoming Call
 @frappe.whitelist(allow_guest=True)
 def handle_request(**kwargs):
+	validate_request()
 	if not is_integration_enabled():
 		return
 
@@ -149,6 +157,17 @@ def get_exotel_settings():
 	return frappe.get_single("CRM Exotel Settings")
 
 
+def validate_request():
+	# workaround security since exotel does not support request signature
+	# /api/method/<exotel-integration-method>?key=<exotel-webhook=verify-token>
+	webhook_verify_token = frappe.db.get_single_value("CRM Exotel Settings", "webhook_verify_token")
+	key = frappe.request.args.get('key')
+	is_valid = key and key == webhook_verify_token
+
+	if not is_valid:
+		frappe.throw(_("Unauthorized request"), exc=frappe.PermissionError)
+
+
 @frappe.whitelist()
 def is_integration_enabled():
 	return frappe.db.get_single_value("CRM Exotel Settings", "enabled", True)