Initial commit

env/lib/python3.10/site-packages/wagtail/utils/file.py

@@ -0,0 +1,35 @@
+import hashlib
+from io import UnsupportedOperation
+
+HASH_READ_SIZE = 2**18  # 256k - matches `hashlib.file_digest`
+
+
+def hash_filelike(filelike):
+    """
+    Compute the hash of a file-like object, without loading it all into memory.
+    """
+    file_pos = 0
+    if hasattr(filelike, "tell"):
+        file_pos = filelike.tell()
+
+    try:
+        # Reset file handler to the start of the file so we hash it all
+        filelike.seek(0)
+    except (AttributeError, UnsupportedOperation):
+        pass
+
+    if hasattr(hashlib, "file_digest"):
+        hasher = hashlib.file_digest(filelike, hashlib.sha1)
+    else:
+        hasher = hashlib.sha1()
+        while True:
+            data = filelike.read(HASH_READ_SIZE)
+            if not data:
+                break
+            hasher.update(data)
+
+    if hasattr(filelike, "seek"):
+        # Reset the file handler to where it was before
+        filelike.seek(file_pos)
+
+    return hasher.hexdigest()