Compress pdf files before sending to end-user

init

@@ -24,6 +24,11 @@ if ! whereis pdflatex | grep "/" &> /dev/null; then
     failed=true
 fi
 
+if ! whereis gs | grep "/" &> /dev/null; then
+    echo "ghostscript" $NEEDS
+    failed=true
+fi
+
 if $failed; then
     fail
 fi

latty.py

@@ -64,10 +64,18 @@ class CLData():
         if result.returncode == 0:
             print(build_text + "[SUCCESS]")
             threading.Timer(60 * 5, cleanup, [output_dir + unique_id]).start()
+            compress_com = "gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.5 -dNOPAUSE -dQUIET -dBATCH -dPrinted=false -sOutputFile=outputs/" + unique_id + ".compressed.pdf outputs/" + unique_id + ".pdf"
+            print(compress_com)
+
+            result = subprocess.run(
+                ['bash', '-c', compress_com],
+                stdout=subprocess.PIPE,
+                text=True
+            )
 
             return (send_from_directory(
                 output_dir,
-                unique_id + ".pdf",
+                unique_id + ".compressed.pdf",
                 attachment_filename=self.username.replace(" ", "") + "_CoverLetter.pdf",
                 as_attachment=True
             ), None)