create webinterface with bottle

convert.py

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+#! /usr/bin/env python3
+
+from pypdf import PdfWriter, PdfReader, Transformation
+from pypdf.generic import RectangleObject
+
+def convert_dhl(id):
+    with open(f"./uploads/{id}.pdf", "rb") as fh:
+        reader = PdfReader(fh)
+        writer = PdfWriter()
+
+        numPages = len(reader.pages)
+        if numPages != 1:
+            exit(1)
+
+        page = reader.pages[0].rotate(90)
+        page = reader.pages[0]
+
+        left = 20
+        bottom = 450
+        right = 570
+        # calculate last value to get a 3:2 rectangle
+        top = bottom+((right-left)/3)*2
+
+        page.mediabox = RectangleObject((left, bottom,right,top))
+        writer.add_page(page)
+
+        with open(f"./downloads/{id}.pdf", "wb") as fh:
+            writer.write(fh)