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| """Web security helpers.""" | |
| def safe_next(value): | |
| """Return `value` only if it's a same-site relative path (open-redirect | |
| guard); otherwise None. Rejects absolute URLs and protocol-relative `//`.""" | |
| if value and value.startswith("/") and not value.startswith("//"): | |
| return value | |
| return None | |