1 files changed, 21 insertions, 0 deletions
diff --git a/testing/web-platform/tests/credential-management/support/fedcm/set_accounts_cookie.py b/testing/web-platform/tests/credential-management/support/fedcm/set_accounts_cookie.py
new file mode 100644
index 0000000000..ab34992210
--- /dev/null
+++ b/testing/web-platform/tests/credential-management/support/fedcm/set_accounts_cookie.py
@@ -0,0 +1,21 @@
+def main(request, response):
+  query_string = request.url_parts[3]
+  # We mark the cookie as HttpOnly so that this request
+  # can be made before login.html, which would overwrite
+  # the value to 1.
+  header_value = "accounts={}; SameSite=None; Secure; HttpOnly".format(query_string)
+  response.headers.set(b"Set-Cookie", header_value.encode("utf-8"))
+  response.headers.set(b"Content-Type", b"text/html")
+
+  return """
+<!DOCTYPE html>
+<script>
+// The important part of this page are the headers.
+
+// If this page was opened as a popup, notify the opener.
+if (window.opener) {
+  window.opener.postMessage("done_loading", "*");
+}
+</script>
+Sent header value: {}".format(header_value)
+"""