mbox parsing improvements v1 (#308)

* mbox parsing improvements v1

* autobots roll out!

collector/scripts/watch/convert/as_mbox.py

 import os
 import datetime
 import email.utils
-from mailbox import mbox
+import re
+import quopri
+import base64
+from mailbox import mbox, mboxMessage
 from slugify import slugify
-from ..utils import guid, file_creation_time, write_to_server_documents, move_source
-from ...utils import tokenize
 from bs4 import BeautifulSoup
+from scripts.watch.utils import (
+    guid,
+    file_creation_time,
+    write_to_server_documents,
+    move_source,
+)
+from scripts.utils import tokenize
+
+
+def get_content(message: mboxMessage) -> str:
+    content = "None"
+    # if message.is_multipart():
+    for part in message.walk():
+        if part.get_content_type() == "text/plain":
+            content = part.get_payload(decode=True)
+            break
+        elif part.get_content_type() == "text/html":
+            soup = BeautifulSoup(part.get_payload(decode=True), "html.parser")
+            content = soup.get_text()
+
+    if isinstance(content, bytes):
+        try:
+            content = content.decode("utf-8")
+        except UnicodeDecodeError:
+            content = content.decode("latin-1")
+
+    return content
+
+
+def parse_subject(subject: str) -> str:
+    # Check if subject is Quoted-Printable encoded
+    if subject.startswith("=?") and subject.endswith("?="):
+        # Extract character set and encoding information
+        match = re.match(r"=\?(.+)\?(.)\?(.+)\?=", subject)
+        if match:
+            charset = match.group(1)
+            encoding = match.group(2)
+            encoded_text = match.group(3)
+            is_quoted_printable = encoding.upper() == "Q"
+            is_base64 = encoding.upper() == "B"
+            if is_quoted_printable:
+                # Decode Quoted-Printable encoded text
+                subject = quopri.decodestring(encoded_text).decode(charset)
+            elif is_base64:
+                # Decode Base64 encoded text
+                subject = base64.b64decode(encoded_text).decode(charset)
+
+    return subject
+
 
 # Process all mbox-related documents.
 def as_mbox(**kwargs):
-    parent_dir = kwargs.get('directory', 'hotdir')
-    filename = kwargs.get('filename')
-    ext = kwargs.get('ext', '.mbox')
-    remove = kwargs.get('remove_on_complete', False)
+    parent_dir = kwargs.get("directory", "hotdir")
+    filename = kwargs.get("filename")
+    ext = kwargs.get("ext", ".mbox")
+    remove = kwargs.get("remove_on_complete", False)
+
+    if filename is not None:
+        filename = str(filename)
+    else:
+        print("[ERROR]: No filename provided.")
+        return (False, "No filename provided.")
+
     fullpath = f"{parent_dir}/{filename}{ext}"
 
     print(f"-- Working {fullpath} --")
     box = mbox(fullpath)
 
     for message in box:
-        content = ""
-        if message.is_multipart():
-            for part in message.get_payload():
-                if part.get_content_type() == 'text/plain':
-                    content = part.get_payload()
-                elif part.get_content_type() == 'text/html':
-                    soup = BeautifulSoup(part.get_payload(), 'html.parser')
-                    content = soup.get_text()
-        else:
-            content = message.get_payload()
+        content = get_content(message)
+        content = content.strip().replace("\r\n", "\n")
+
+        if len(content) == 0:
+            print("[WARNING]: Mail with no content. Ignored.")
+            continue
 
-        date_tuple = email.utils.parsedate_tz(message['Date'])
+        date_tuple = email.utils.parsedate_tz(message["Date"])
         if date_tuple:
-            local_date = datetime.datetime.fromtimestamp(email.utils.mktime_tz(date_tuple))
+            local_date = datetime.datetime.fromtimestamp(
+                email.utils.mktime_tz(date_tuple)
+            )
             date_sent = local_date.strftime("%a, %d %b %Y %H:%M:%S")
         else:
             date_sent = None
 
+        subject = message["Subject"]
+
+        if subject is None:
+            print("[WARNING]: Mail with no subject. But has content.")
+            subject = "None"
+        else:
+            subject = parse_subject(subject)
+
+        abs_path = os.path.abspath(
+            f"{parent_dir}/processed/{slugify(filename)}-{guid()}{ext}"
+        )
         data = {
-            'id': guid(),
-            'url': "file://"+os.path.abspath(f"{parent_dir}/processed/{slugify(filename)}-{guid()}{ext}"),
-            'title': message['Subject'],
-            'docAuthor': message['From'],
-            'description': f"email {message['From']} to {message['To']}",
-            'docSource': "mbox file uploaded by the user.",
-            'published': file_creation_time(fullpath),
-            'sender': message['From'],
-            'recipient': message['To'],
-            'subject': message['Subject'],
-            'date_sent': date_sent,
-            'wordCount': len(content),
-            'pageContent': content,
-            'token_count_estimate': len(tokenize(content))
+            "id": guid(),
+            "url": f"file://{abs_path}",
+            "title": subject,
+            "docAuthor": message["From"],
+            "description": f"email from {message['From']} to {message['To']}",
+            "docSource": "mbox file uploaded by the user.",
+            "published": file_creation_time(fullpath),
+            "sender": message["From"],
+            "recipient": message["To"],
+            "subject": subject,
+            "date_sent": date_sent,
+            "wordCount": len(content),
+            "pageContent": content,
+            "token_count_estimate": len(tokenize(content)),
         }
 
         write_to_server_documents(data, f"{slugify(filename)}-{data.get('id')}")
 
     move_source(parent_dir, f"{filename}{ext}", remove=remove)
     print(f"[SUCCESS]: {filename}{ext} converted & ready for embedding.\n")
-    return(True, None)
+    return (True, None)