.

rapids/migrations/0037_auto_20211121_1020.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.2.4 on 2021-11-21 10:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rapids', '0036_alter_exam_open_access'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='rapidimage',
+            name='image_md5_hash',
+            field=models.CharField(max_length=32, null=True),
+        ),
+        migrations.AddField(
+            model_name='rapidimage',
+            name='is_dicom',
+            field=models.BooleanField(default=False),
+        ),
+    ]

rapids/models.py

@@ -29,6 +29,11 @@ import reversion
 
 import json
 
+import hashlib
+
+import pydicom
+import pydicom.errors
+
 image_storage = FileSystemStorage(
     # Physical file location ROOT
     location=u"{0}".format(settings.MEDIA_ROOT),
@@ -432,6 +437,10 @@ class RapidImage(models.Model):
 
     feedback_image = models.BooleanField(default=False)
 
+    image_md5_hash = models.CharField(max_length=32, null=True)
+
+    is_dicom = models.BooleanField(default=False)
+
     def image_tag(self):
         if self.image:
             return mark_safe(
@@ -442,6 +451,19 @@ class RapidImage(models.Model):
 
     image_tag.short_description = 'Image'
 
+    def save(self, *args, **kwargs):
+        """Override save method to add image hash"""
+        if self.image:
+            # Try and read the file as a dicom
+            try:
+                hash = ",".join(pydicom.dcmread(self.image).pixel_array.tostring())
+                self.is_dicom = True
+            except pydicom.errors.InvalidImageFormatError:
+                hash = hashlib.md5(self.image).hexdigest()
+
+            self.image_md5_hash = hash
+        super().save(*args, **kwargs)  # Call the "real" save() method.
+
 
 class RapidCreationDefault(models.Model):
     #author = models.OneToOneField(User,

requirements.txt

@@ -22,3 +22,4 @@ django-tinymce
 django-zipview
 pymemcache
 django-autocomplete-light
+django-querysetsequence