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venv/lib/python3.12/site-packages/allauth/socialaccount/providers/oauth2/utils.py

@@ -0,0 +1,28 @@
+import base64
+import hashlib
+
+
+try:
+    from secrets import token_urlsafe
+except ImportError:
+    # token_urlsafe polyfill for Python < 3.6
+    import os
+
+    def token_urlsafe(nbytes=None):
+        if nbytes is None:
+            nbytes = 32
+        tok = os.urandom(nbytes)
+        return base64.urlsafe_b64encode(tok).rstrip(b"=").decode("ascii")
+
+
+def generate_code_challenge():
+    # Create a code verifier with a length of 128 characters
+    code_verifier = token_urlsafe(96)
+    hashed_verifier = hashlib.sha256(code_verifier.encode("ascii"))
+    code_challenge = base64.urlsafe_b64encode(hashed_verifier.digest())
+    code_challenge_without_padding = code_challenge.rstrip(b"=")
+    return {
+        "code_verifier": code_verifier,
+        "code_challenge_method": "S256",
+        "code_challenge": code_challenge_without_padding,
+    }