moved GenFace and GenThumb common code into shared, and hook it in both f/e and b/e where needed

shared.py

@@ -1,5 +1,9 @@
 import socket
 import os
+import face_recognition
+import io
+import base64
+from PIL import Image, ImageOps
 
 hostname = socket.gethostname()
 PROD_HOST="pa_web"
@@ -73,3 +77,33 @@ def SymlinkName(ptype, path, file):
     if symlink[-1] == '/':
         symlink=symlink[0:-1]
     return symlink
+
+
+def GenThumb(fname):
+    print( f"GenThumb({fname})" )
+
+    try:
+        im_orig = Image.open(fname)
+        im = ImageOps.exif_transpose(im_orig)
+        bands = im.getbands()
+        if 'A' in bands:
+            im = im.convert('RGB')
+        im.thumbnail((THUMBSIZE,THUMBSIZE))
+        img_bytearray = io.BytesIO()
+        im.save(img_bytearray, format='JPEG')
+        img_bytearray = img_bytearray.getvalue()
+        thumbnail = base64.b64encode(img_bytearray)
+        thumbnail = str(thumbnail)[2:-1]
+        return thumbnail
+    except Exception as e:
+        print( f"GenThumb failed: {e}")
+        return None
+
+def GenFace(fname):
+    img = face_recognition.load_image_file(fname)
+    location = face_recognition.face_locations(img)
+    encodings = face_recognition.face_encodings(img, known_face_locations=location)
+    if len(encodings):
+        return encodings[0].tobytes()
+    else:
+        return None