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45 lines
2 KiB
Go
45 lines
2 KiB
Go
// Copyright 2016 Michal Witkowski. All Rights Reserved.
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// See LICENSE for licensing terms.
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/*
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`grpc_validator` is a generic request contents validator server-side middleware for gRPC.
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Request Validator Middleware
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Validating input is important, and hard. It also causes a lot of boilerplate code. This middleware
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checks for the existence of a `Validate` method on each of the messages of a gRPC request. This
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includes the single request of the `Unary` calls, as well as each message of the inbound Stream calls.
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In case of a validation failure, an `InvalidArgument` gRPC status is returned, along with a
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description of the validation failure.
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While it is generic, it was intended to be used with https://github.com/mwitkow/go-proto-validators,
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a Go protocol buffers codegen plugin that creates the `Validate` methods (including nested messages)
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based on declarative options in the `.proto` files themselves. For example:
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syntax = "proto3";
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package validator.examples;
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import "github.com/mwitkow/go-proto-validators/validator.proto";
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message InnerMessage {
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// some_integer can only be in range (1, 100).
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int32 some_integer = 1 [(validator.field) = {int_gt: 0, int_lt: 100}];
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// some_float can only be in range (0;1).
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double some_float = 2 [(validator.field) = {float_gte: 0, float_lte: 1}];
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}
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message OuterMessage {
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// important_string must be a lowercase alpha-numeric of 5 to 30 characters (RE2 syntax).
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string important_string = 1 [(validator.field) = {regex: "^[a-z]{2,5}$"}];
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// proto3 doesn't have `required`, the `msg_exist` enforces presence of InnerMessage.
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InnerMessage inner = 2 [(validator.field) = {msg_exists : true}];
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}
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The `OuterMessage.Validate` would include validation of regexes, existence of the InnerMessage and
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the range values within it. The `grpc_validator` middleware would then automatically use that to
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check all messages processed by the server.
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Please consult https://github.com/mwitkow/go-proto-validators for details on `protoc` invocation and
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other parameters of customization.
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*/
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package grpc_validator
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