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// Copyright 2021 Igor Lazarev. All rights reserved. |
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// Use of this source code is governed by a MIT-style |
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// license that can be found in the LICENSE file. |
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// Package validation provides tools for data validation. |
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// It is designed to create complex validation rules with abilities to hook into the validation process. |
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package validation |
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import ( |
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"context" |
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) |
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const DefaultGroup = "default" |
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// Validatable is interface for creating validatable types on the client side. |
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// By using it you can build complex validation rules on a set of objects used in other objects. |
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// |
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// Example |
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// type Book struct { |
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// Title string |
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// Author string |
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// Keywords []string |
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// } |
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// |
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// func (b Book) Validate(ctx context.Context, validator *validation.Validator) error { |
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// return validator.Validate( |
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// ctx, |
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// validation.StringProperty("title", &b.Title, it.IsNotBlank()), |
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// validation.StringProperty("author", &b.Author, it.IsNotBlank()), |
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// validation.CountableProperty("keywords", len(b.Keywords), it.HasCountBetween(1, 10)), |
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// validation.EachStringProperty("keywords", b.Keywords, it.IsNotBlank()), |
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// ) |
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// } |
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type Validatable interface { |
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Validate(ctx context.Context, validator *Validator) error |
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} |
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// ValidatableFunc is a functional adapter for the Validatable interface. |
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type ValidatableFunc func(ctx context.Context, validator *Validator) error |
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// Validate runs validation process on function. |
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func (f ValidatableFunc) Validate(ctx context.Context, validator *Validator) error { |
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return f(ctx, validator) |
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} |
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// Filter is used for processing the list of errors to return a single ViolationList. |
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// If there is at least one non-violation error it will return it instead. |
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func Filter(violations ...error) error { |
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list := &ViolationList{} |
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for _, violation := range violations { |
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err := list.AppendFromError(violation) |
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if err != nil { |
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return err |
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} |
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} |
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return list.AsError() |
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} |
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muonsoft /
validation
