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import base64
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def sasl_plain_blob(username: str, passphrase: str) -> str:
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blob = base64.b64encode(
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b"\x00".join(
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(
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username.encode("utf-8"),
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username.encode("utf-8"),
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passphrase.encode("utf-8"),
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)
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)
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)
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blobstr = blob.decode("ascii")
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return f"AUTHENTICATE {blobstr}"
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