start adding uncat dicom

helpers/images.py

@@ -1,4 +1,5 @@
 import base64
+import hashlib
 import mimetypes
 
 from io import BytesIO
@@ -152,4 +153,40 @@ def print_dicom(dataset, indent=0):
                 l.append("{0:s} {1:s} = {2:s}".format(indent_string,
                                                    data_element.name,
                                                    repr_value))
-    return "\n<br/>".join(l)
+    return "\n<br/>".join(l)
+
+def get_image_hash(img) -> (str, bool):
+    is_dicom = False
+    # Try and read the file as a dicom
+    try:
+        # and generate a hash from the pixel data
+        # TODO: improve?
+        dataset = pydicom.dcmread(img)
+        # flatten = dataset.pixel_array.astype(str).flatten()
+        # print("flatteded")
+        # pre_join = ",".join(flatten)
+        # print(pre_join)
+        # hash = hashlib.md5(pre_join.encode()).hexdigest()
+        # ----
+        md5 = hashlib.md5()
+        first = True
+        for i in dataset.pixel_array.astype(str).flatten():
+            if first:
+                first = False
+                md5.update(f"{i}".encode())
+            else:
+                md5.update(f",{i}".encode())
+
+        hash = md5.hexdigest()
+        is_dicom = True
+        # ----
+
+    except pydicom.errors.InvalidDicomError:
+        try:  # This is horrible (but needed for current unit tests)
+            # (we use a temporary file that breaks here)
+            img.file.open()
+            hash = hashlib.md5(img.read()).hexdigest()
+        except AttributeError:
+            return "12345ABCD", False
+
+    return hash, is_dicom