#25 Public reports

* adds public report rendering for intervention model
* adds new routes for report
* adds new public_base.html and public_navbar.html
* adds lookup table for zoom levels for lanis link generating
* moves qr code generating into utils/generators.py

konova/utils/generators.py

@@ -7,6 +7,10 @@ Created on: 09.11.20
 """
 import random
 import string
+import qrcode
+import qrcode.image.svg
+
+from io import BytesIO
 
 
 def generate_random_string(length: int, use_numbers: bool = False, use_letters_lc: bool = False, use_letters_uc: bool = False) -> str:
@@ -24,3 +28,24 @@ def generate_random_string(length: int, use_numbers: bool = False, use_letters_l
     elements = "".join(elements)
     ret_val = "".join(random.choice(elements) for i in range(length))
     return ret_val
+
+
+def generate_qr_code(content: str, size: int = 20) -> str:
+    """ Generates a qr code from given content
+
+    Args:
+        content (str): The content for the qr code
+        size (int): The image size
+
+    Returns:
+        qrcode_svg (str): The qr code as svg
+    """
+    qrcode_factory = qrcode.image.svg.SvgImage
+    qrcode_img = qrcode.make(
+        content,
+        image_factory=qrcode_factory,
+        box_size=size
+    )
+    stream = BytesIO()
+    qrcode_img.save(stream)
+    return stream.getvalue().decode()