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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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"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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var ErrModificationProhibited = validation.NewError( |
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"modification is prohibited", |
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"Modification of resource is prohibited.", |
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) |
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type AccessViolation struct { |
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validation.Violation |
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UserID int |
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Permission string |
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} |
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func (err *AccessViolation) Error() string { |
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return err.Violation.Error() |
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} |
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type Blog struct { |
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Name string |
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Entries BlogEntries |
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} |
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func (b Blog) Validate(ctx context.Context, validator *validation.Validator, userID int) error { |
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return validator.Validate( |
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ctx, |
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validation.StringProperty("name", b.Name, it.IsNotBlank(), it.HasMaxLength(50)), |
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validation.ValidProperty( |
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"entries", |
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validation.ValidatableFunc(func(ctx context.Context, validator *validation.Validator) error { |
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// passing user id further |
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return b.Entries.Validate(ctx, validator, userID) |
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}), |
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), |
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) |
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} |
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type BlogEntry struct { |
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AuthorID int |
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Title string |
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Text string |
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} |
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func (e BlogEntry) Validate(ctx context.Context, validator *validation.Validator, userID int) error { |
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// creating violation with domain payload |
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if e.AuthorID != userID { |
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return &AccessViolation{ |
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Violation: validator.CreateViolation(ctx, ErrModificationProhibited, ErrModificationProhibited.Message()), |
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UserID: userID, |
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Permission: "edit", |
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} |
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} |
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return validator.Validate( |
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ctx, |
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validation.StringProperty("title", e.Title, it.IsNotBlank(), it.HasMaxLength(100)), |
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validation.StringProperty("text", e.Text, it.IsNotBlank(), it.HasMaxLength(10000)), |
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) |
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} |
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type BlogEntries []BlogEntry |
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func (entries BlogEntries) Validate(ctx context.Context, validator *validation.Validator, userID int) error { |
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violations := validation.NewViolationList() |
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for i, entry := range entries { |
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err := violations.AppendFromError(entry.Validate(ctx, validator.AtIndex(i), userID)) |
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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 ExampleValidator_ValidateIt_violationWithPayload() { |
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blog := Blog{ |
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Name: "News blog", |
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Entries: []BlogEntry{ |
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{ |
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AuthorID: 123, |
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Title: "Good weather", |
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Text: "Good weather is coming!", |
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}, |
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{ |
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AuthorID: 321, |
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Title: "Secret entry", |
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Text: "This should not be edited!", |
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}, |
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}, |
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} |
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userID := 123 // user id from session |
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err := validator.ValidateIt( |
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context.Background(), |
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validation.ValidatableFunc(func(ctx context.Context, validator *validation.Validator) error { |
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return blog.Validate(ctx, validator, userID) |
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}), |
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) |
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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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// unwrap concrete violation from chain |
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if accessError, ok := violation.(*AccessViolation); ok { |
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fmt.Println("user id:", accessError.UserID) |
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fmt.Println("permission:", accessError.Permission) |
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} |
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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 "entries[1]": "Modification of resource is prohibited." |
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// user id: 123 |
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// permission: edit |
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} |
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muonsoft /
validation
