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%% Copyright (c) 2023 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(msmp_handshake). |
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-export([decode/0]). |
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-spec decode() -> scran:parser(binary(), msmp:handshake()). |
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decode() -> |
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fun |
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(Input) -> |
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(scran_sequence:combined_with( |
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scran_result:into_map( |
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scran_sequence:sequence( |
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[scran_result:kv( |
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action, |
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scran_combinator:value( |
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handshake, |
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scran_bytes:tag(<<10:8>>))), |
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scran_result:kv( |
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server_version, |
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scran_bytes:null_terminated()), |
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scran_result:kv( |
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thread_id, |
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msmp_integer_fixed:decode(4)), |
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scran_result:kv( |
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auth_plugin_data_part_1, |
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scran_bytes:take(8)), |
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scran_result:kv( |
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filler, |
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msmp_integer_fixed:decode(1)), |
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scran_result:kv( |
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capability_flags_1, |
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msmp_capabilities:decode(lower)), |
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scran_result:kv( |
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character_set, |
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msmp_integer_fixed:decode(1)), |
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scran_result:kv( |
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status_flags, |
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msmp_integer_fixed:decode(2)), |
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scran_result:kv( |
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capability_flags_2, |
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msmp_capabilities:decode(upper)), |
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scran_result:kv( |
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auth_plugin_data_len, |
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msmp_integer_fixed:decode(1)), |
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%% Determine whether we are connected to MySQL or |
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%% MariaDB |
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%% |
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scran_branch:alt( |
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[scran_sequence:sequence( |
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[scran_result:kv( |
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reserved, |
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scran_bytes:tag(<<0:10/unit:8>>)), |
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scran_result:kv( |
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operator, |
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scran_combinator:success(mysql))]), |
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scran_sequence:sequence( |
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[scran_result:kv( |
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reserved, |
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scran_bytes:tag(<<0:6/unit:8>>)), |
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scran_result:kv( |
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extended_capabilities, |
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msmp_integer_fixed:decode(4)), |
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scran_result:kv( |
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operator, |
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scran_combinator:success(mariadb))])])])), |
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fun |
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(#{capability_flags_2 := #{plugin_auth := true}, |
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auth_plugin_data_len := AuthPluginDataLen}) -> |
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scran_result:into_map( |
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scran_sequence:sequence( |
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[scran_result:kv( |
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auth_plugin_data_part_2, |
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scran_bytes:take(max(13, AuthPluginDataLen - 8))), |
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scran_result:kv( |
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auth_plugin_name, |
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scran_result:into_atom( |
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scran_bytes:null_terminated()))])) |
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end))(Input) |
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end. |