create .qmail and message file if needed

.gitignore

@@ -142,7 +142,7 @@ dmypy.json
 cython_debug/
 
 # Project specific
-message.txt
+message*.txt
 config.py
 inventory.txt
 ansible/host_vars/*

autoreply_editor/main.py

@@ -1,7 +1,9 @@
 """Provide basic settings and views"""
 
 import fileinput
+import os
 import re
+import shutil
 from pathlib import Path
 from flask import request, render_template
 from flask_basicauth import BasicAuth
@@ -9,24 +11,66 @@ from autoreply_editor import app
 
 basic_auth = BasicAuth(app)
 
-qmail_prefix = f"{str(Path.home())}/.qmail-"
 maildrop_line = "|maildrop $HOME/.filter-autoreply"
 
+
 def qmail_status(user):
     """Find out whether the filter is currently activated for the given mail user"""
-    with open(f"{qmail_prefix}{user}", encoding="utf8") as dotqmail:
-        # TODO: RE not necessary here
-        if not re.search(
-            r"^\|maildrop \$HOME/\.filter-autoreply$", dotqmail.read(), re.MULTILINE
+    with open(get_qmailfile(app.config.get("MAIL_USER")), encoding="utf8") as qmailfile:
+        # trigger to check whether we have to re-open the file for initialisation
+        initialise = False
+
+        # try to find active filter
+        if re.search(
+            r"^\|maildrop \$HOME/\.filter-autoreply$", qmailfile.read(), re.MULTILINE
         ):
-            return False
-        else:
             return True
+        else:
+            # jump back to top of file because we've read it in the "if"
+            qmailfile.seek(0)
+
+            # filter is deactivated (commented)
+            if re.search(
+                r"^#\|maildrop \$HOME/\.filter-autoreply$",
+                qmailfile.read(),
+                re.MULTILINE,
+            ):
+                return False
+            else:
+                initialise = True
+
+    # Append a commented filter command to the file
+    if initialise:
+        with open(
+            get_qmailfile(app.config.get("MAIL_USER")), mode="a", encoding="utf8"
+        ) as qmailfile:
+            qmailfile.write("#|maildrop $HOME/.filter-autoreply")
+
+        return False
+
+
+def get_messagefile(user):
+    """Return message file of user, and create if necessary"""
+    filepath = f"message-{user}.txt"
+    if not os.path.isfile(filepath):
+        Path(filepath).touch()
+
+    return filepath
+
+
+def get_qmailfile(user):
+    """Return qmail file of user, and create if necessary based on default qmail"""
+    qmail_base = f"{str(Path.home())}/.qmail"
+    filepath = f"{qmail_base}-{user}"
+    if not os.path.isfile(filepath):
+        shutil.copy(f"{qmail_base}-default", filepath)
+
+    return filepath
 
 
 @app.route("/")
 def index():
-    with open(app.config.get("MESSAGE_FILE"), "r", encoding="utf-8") as messagefile:
+    with open(get_messagefile("user"), "r", encoding="utf-8") as messagefile:
         message = messagefile.read()
 
     return render_template(
@@ -41,9 +85,7 @@ def index_post():
     if request.method == "POST":
         if request.form["action"] == "message":
             input_message = request.form["message"]
-            with open(
-                app.config.get("MESSAGE_FILE"), "w", encoding="utf-8"
-            ) as messagefile:
+            with open(get_messagefile("user"), "w", encoding="utf-8") as messagefile:
                 messagefile.write(str(input_message))
                 result = "Success: The autoreply message has been updated!"
 
@@ -57,11 +99,11 @@ def index_post():
                 preshould = "#"
 
             with fileinput.FileInput(
-                f"{qmail_prefix}{app.config.get('MAIL_USER')}",
+                get_qmailfile(app.config.get("MAIL_USER")),
                 inplace=True,
                 backup=".bak",
-            ) as dotqmail:
-                for line in dotqmail:
+            ) as qmailfile:
+                for line in qmailfile:
                     print(
                         line.replace(
                             f"{preis}{maildrop_line}", f"{preshould}{maildrop_line}"