mirror of
https://github.com/ninenines/cowboy.git
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61 lines
1.9 KiB
Erlang
61 lines
1.9 KiB
Erlang
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%% Copyright (c) 2014, Loïc Hoguin <essen@ninenines.eu>
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%%
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%% Permission to use, copy, modify, and/or distribute this software for any
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%% purpose with or without fee is hereby granted, provided that the above
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%% copyright notice and this permission notice appear in all copies.
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%%
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%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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-module(cowboy_constraints).
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-export([validate/2]).
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-type constraint() :: int | nonempty | fun().
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-export_type([constraint/0]).
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-spec validate(binary(), [constraint()]) -> true | {true, any()} | false.
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validate(Value, [Constraint]) ->
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apply_constraint(Value, Constraint);
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validate(Value, Constraints) when is_list(Constraints) ->
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validate_list(Value, Constraints, original);
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validate(Value, Constraint) ->
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apply_constraint(Value, Constraint).
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validate_list(_, [], original) ->
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true;
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validate_list(Value, [], modified) ->
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{true, Value};
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validate_list(Value, [Constraint|Tail], State) ->
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case apply_constraint(Value, Constraint) of
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true ->
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validate_list(Value, Tail, State);
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{true, Value2} ->
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validate_list(Value2, Tail, modified);
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false ->
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false
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end.
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%% @todo {int, From, To}, etc.
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apply_constraint(Value, int) ->
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int(Value);
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apply_constraint(Value, nonempty) ->
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nonempty(Value);
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apply_constraint(Value, F) when is_function(F) ->
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F(Value).
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%% Constraint functions.
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int(Value) when is_binary(Value) ->
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try {true, list_to_integer(binary_to_list(Value))}
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catch _:_ -> false
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end.
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nonempty(<<>>) -> false;
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nonempty(Value) when is_binary(Value) -> true.
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