Add fortune reply script

1 files changed, 45 insertions, 0 deletions

diff --git a/ansible/roles/postfix/files/services/fortune-reply.sh b/ansible/roles/postfix/files/services/fortune-reply.sh
new file mode 100755
index 0000000..6dbfe9b
--- /dev/null
+++ b/ansible/roles/postfix/files/services/fortune-reply.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+
+# Read the entire email into a variable
+EMAIL=$(cat)
+
+# Extract the sender's email address
+SENDER=$(echo "$EMAIL" | grep -i "^From:" | head -n 1 | sed -E 's/.*<([^>]+)>.*/\1/;t;s/^From:[[:space:]]*//')
+
+# Filter for invalid emails or attempted spoofs that were injected into the From header
+if ! echo "$SENDER" | grep -qE '^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$'; then
+    echo "Attempted spoof detected, quitting."
+    exit 1
+fi
+
+# Extract the Message-ID of the original email
+MESSAGE_ID=$(echo "$EMAIL" | grep -i "^Message-ID:" | head -n 1 | awk '{print $2}')
+
+# Extract the original Subject and prefix it with "Re: " if necessary
+ORIGINAL_SUBJECT=$(echo "$EMAIL" | grep -i "^Subject:" | head -n 1 | sed -E 's/Subject: (Re: )?(.+)/\2/')
+
+# Construct the reply subject
+REPLY_SUBJECT="Re: $ORIGINAL_SUBJECT"
+
+# Extract the To address
+TO_ADDRESS=$(echo "$EMAIL" | grep -i "^To:" | sed -E 's/To: (.*)/\1/')
+
+# Generate the fortune output
+if [[ "$TO_ADDRESS" =~ "fortune+cowsay" ]]; then
+  FORTUNE_OUTPUT=$(/usr/games/fortune | /usr/games/cowsay)
+else
+  FORTUNE_OUTPUT=$(/usr/games/fortune)
+fi
+
+# Send a reply with the proper headers
+(
+  echo "Subject: $REPLY_SUBJECT"
+  echo "From: Fortunes by Python Discord <[email protected]>"
+  echo "To: $SENDER"
+  echo "In-Reply-To: $MESSAGE_ID"
+  echo "References: $MESSAGE_ID"
+  echo
+  echo "Here's your fortune:"
+  echo
+  echo "$FORTUNE_OUTPUT"
+) | /usr/sbin/sendmail -t