change short message by interceptor #1262
Description
📨 Help Request – Modify SMS Content in Interceptor and Forward to sms_logger
Subject: How to modify short_message in MT Interceptor and forward modified data to sms_logger?
Message:
Hello Jasmin community,
I'm currently developing a smart SMS filtering and transformation system using Jasmin SMS Gateway. I'm using MTInterceptor with a Python script to intercept and modify outgoing messages.
✅ What I'm trying to achieve:
Modify the short_message before it's sent out.
Ensure the modified message and metadata (brand, pattern, etc.) are forwarded properly to sms_logger (which listens to AMQP submit.sm and submit.sm.resp).
Avoid affecting DLR or delivery tracking.
🔍 My setup:
Jasmin 0.9+ running on Linux.
Python3 interceptor script like this:
def intercept(routable):
old_msg = routable.message.decode(errors='ignore')
new_msg = "Modified message 123456"
routable.message = new_msg.encode('utf-8')
return routable
❗ The problem:
Even though the script runs (verified via Jasmin logs), the actual message sent is still the original one, not the modified one. I also want to pass extra metadata (like x-brand, x-pattern, x-transformed) to the message headers so that sms_logger.py can log them.
💭 What I've tried:
Modifying routable.pdu.params['short_message'] — has no effect.
Modifying routable.message — also seems ineffective.
I confirmed MTInterceptor is registered correctly and is being executed.
The message in submit.sm still shows original content.
AMQP headers from Interceptor are not being passed to the logger.
❓ What I need help with:
What is the correct way to permanently modify the message content before sending it?
How can I add custom headers or metadata in the interceptor (e.g. x-brand, x-transformed_message) that will be visible to sms_logger or through the AMQP exchange?
Are there limitations in Jasmin's MTInterceptor that prevent such changes?
Any help, guidance, or working examples would be greatly appreciated!
Best regards,