feat(publications): detect attachment MIME type for uploads [no ci]

Author: PromiseFru

INSTALL.md

@@ -13,7 +13,7 @@ curl -fsSL https://raw.githubusercontent.com/smswithoutborders/RelaySMS-Publishe
 ```bash
 sudo apt-get update
 sudo apt-get install -y python3 python3-pip python3-venv python3-dev \
-    build-essential pkg-config libsqlcipher-dev git make curl
+    build-essential pkg-config libsqlcipher-dev libmagic1 git make curl
 ```
 
 ### Rust

README.md

@@ -20,7 +20,7 @@ Publish content to online platforms (Gmail, Twitter, Telegram, etc.) using SMS w
 **Ubuntu Dependencies:**
 
 ```bash
-sudo apt install python3-dev build-essential libsqlcipher-dev pkg-config make git
+sudo apt install python3-dev build-essential libsqlcipher-dev libmagic1 pkg-config make git
 ```
 
 ## Installation

install.sh

@@ -39,6 +39,7 @@ install_system_deps() {
     python3 python3-pip python3-venv python3-dev \
     build-essential pkg-config \
     libsqlcipher-dev \
+    libmagic1 \
     openssl git make curl ||
     error "Failed to install system dependencies"
 }

lib_relaysms_payload_specs

@@ -2,6 +2,8 @@
 """Publication processing pipeline service."""
 
 import base64
+import magic
+import uuid
 from typing import Optional
 
 from sqlalchemy.orm import Session
@@ -329,7 +331,25 @@ def _get_adapter_params(
 
         attachment = content.get_attachment()
         if attachment:
-            params["attachments"] = [{"data": base64.b64encode(attachment).decode()}]
+            try:
+                mimetype = magic.from_buffer(attachment[:2048], mime=True)
+            except magic.MagicException:
+                mimetype = None
+
+            if not mimetype:
+                logger.warning("Could not determine MIME type of attachment.")
+                mimetype = "application/octet-stream"
+
+            extension = mimetype.split("/")[-1] or "bin"
+            filename = f"{uuid.uuid4().hex}.{extension}"
+
+            params["attachments"] = [
+                {
+                    "data": base64.b64encode(attachment).decode(),
+                    "filename": filename,
+                    "mimetype": mimetype,
+                }
+            ]
 
         message = content.get_body().decode()
 

publications.py

@@ -11,6 +11,7 @@ grpcio-tools==1.80.0
 msgspec==0.21.1
 phonenumbers==9.0.30
 pymysql==1.1.3
+python-magic==0.4.27
 requests==2.34.2
 sentry-sdk[grpcio]==2.60.0
 sqlalchemy==2.0.50