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package validation_test |
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import ( |
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"context" |
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"fmt" |
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"net/url" |
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"github.com/muonsoft/validation" |
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"github.com/muonsoft/validation/it" |
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"github.com/muonsoft/validation/validator" |
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) |
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type Webstore struct { |
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Name string |
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URL string |
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Items WebstoreItems |
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} |
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func (w Webstore) Validate(ctx context.Context, validator *validation.Validator) error { |
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domain := "" |
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u, err := url.Parse(w.URL) |
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if err == nil { |
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domain = u.Host |
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} |
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return validator.Validate( |
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ctx, |
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validation.StringProperty("name", w.Name, it.IsNotBlank(), it.HasMaxLength(100)), |
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validation.StringProperty("url", w.URL, it.IsNotBlank(), it.IsURL()), |
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validation.CountableProperty("items", len(w.Items), it.IsNotBlank(), it.HasMaxCount(20)), |
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validation.ValidProperty( |
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"items", |
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validation.ValidatableFunc(func(ctx context.Context, validator *validation.Validator) error { |
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// passing context value by callback function |
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return w.Items.Validate(ctx, validator, domain) |
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}), |
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), |
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) |
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} |
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type WebstoreItem struct { |
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Name string |
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URL string |
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Price int |
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} |
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func (w WebstoreItem) Validate(ctx context.Context, validator *validation.Validator, webstoreDomain string) error { |
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return validator.Validate( |
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ctx, |
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validation.StringProperty("name", w.Name, it.IsNotBlank(), it.HasMaxLength(100)), |
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validation.NumberProperty[int]("price", w.Price, it.IsNotBlankNumber[int](), it.IsLessThan[int](10000)), |
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validation.StringProperty( |
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"url", w.URL, |
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it.IsNotBlank(), |
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// using webstore domain passed as a function parameter |
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it.IsURL().WithHosts(webstoreDomain).WithProhibitedMessage( |
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`Webstore item URL domain must match "{{ webstoreDomain }}".`, |
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validation.TemplateParameter{Key: "{{ webstoreDomain }}", Value: webstoreDomain}, |
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), |
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), |
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) |
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} |
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type WebstoreItems []WebstoreItem |
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func (items WebstoreItems) Validate(ctx context.Context, validator *validation.Validator, webstoreDomain string) error { |
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violations := validation.NewViolationList() |
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for i, item := range items { |
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// passing context value to each item |
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err := violations.AppendFromError(item.Validate(ctx, validator.AtIndex(i), webstoreDomain)) |
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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 violations.AsError() |
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} |
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func ExampleValidatableFunc_Validate() { |
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store := Webstore{ |
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Name: "Acme store", |
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URL: "https://acme.com/homepage", |
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Items: []WebstoreItem{ |
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{ |
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Name: "Book", |
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URL: "https://acme.com/items/the-book", |
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Price: 100, |
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}, |
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{ |
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Name: "Notepad", |
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URL: "https://store.com/items/notepad", |
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Price: 1000, |
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}, |
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}, |
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} |
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err := validator.Validate(context.Background(), validation.Valid(store)) |
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if violations, ok := validation.UnwrapViolationList(err); ok { |
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violations.ForEach(func(i int, violation validation.Violation) error { |
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fmt.Println(violation) |
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return nil |
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}) |
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} |
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// Output: |
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// violation at "items[1].url": "Webstore item URL domain must match "acme.com"." |
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} |
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muonsoft /
validation
