validator.go - Code Metrics - Inspection of "Beta (update to generics)" - muonsoft/validation - Measure and Improve Code Quality continuously with Scrutinizer

Test Setup Failed

Pull Request — main (#71)

by Igor

created 2022-04-10 14:27 UTC

validator.go B

↳ Parent: Project

Size/Duplication

Total Lines	266
Duplicated Lines	0 %

Test Coverage

Coverage

98.48%

Importance

Changes

Metric	Value
cc	44
eloc	114
dl	0
loc	266
ccs	65
cts	66
cp	0.9848
crap	44.0067
rs	8.8798
c	0
b	0
f	0

package validation

import (
	"context"
	"fmt"
	"time"

	"github.com/muonsoft/validation/message/translations"
	"golang.org/x/text/language"
	"golang.org/x/text/message/catalog"
)

// Validator is the main validation service. It can be created by NewValidator constructor.
// Also, you can use singleton version from the package "github.com/muonsoft/validation/validator".
type Validator struct {
	scope Scope
}

// Translator is used to translate violation messages. By default, validator uses an implementation from
// "github.com/muonsoft/validation/message/translations" package based on "golang.org/x/text" package.
// You can set up your own implementation by using SetTranslator option.
type Translator interface {
	Translate(tag language.Tag, message string, pluralCount int) string
}

// ValidatorOptions is a temporary structure for collecting functional options ValidatorOption.
type ValidatorOptions struct {
	translatorOptions []translations.TranslatorOption
	translator        Translator
	violationFactory  ViolationFactory
	constraints       map[string]Constraint
}

func newValidatorOptions() *ValidatorOptions {
	return &ValidatorOptions{
		constraints: map[string]Constraint{},
	}
}

// ValidatorOption is a base type for configuration options used to create a new instance of Validator.
type ValidatorOption func(options *ValidatorOptions) error

// NewValidator is a constructor for creating an instance of Validator.
// You can configure it by using validator options.
func NewValidator(options ...ValidatorOption) (*Validator, error) {
	var err error

	opts := newValidatorOptions()
	for _, setOption := range options {
		err = setOption(opts)
		if err != nil {
			return nil, err
		}
	}

	if opts.translator != nil && len(opts.translatorOptions) > 0 {
		return nil, errTranslatorOptionsDenied
	}
	if opts.translator == nil {
		opts.translator, err = translations.NewTranslator(opts.translatorOptions...)
		if err != nil {
			return nil, fmt.Errorf("failed to set up default translator: %w", err)
		}
	}
	if opts.violationFactory == nil {
		opts.violationFactory = newViolationFactory(opts.translator)
	}

	validator := &Validator{scope: newScope(
		opts.translator,
		opts.violationFactory,
		opts.constraints,
	)}

	return validator, nil
}

func newScopedValidator(scope Scope) *Validator {
	return &Validator{scope: scope}
}

// DefaultLanguage option is used to set up the default language for translation of violation messages.
func DefaultLanguage(tag language.Tag) ValidatorOption {
	return func(options *ValidatorOptions) error {
		options.translatorOptions = append(options.translatorOptions, translations.DefaultLanguage(tag))

		return nil
	}
}

// Translations option is used to load translation messages into the validator.
//
// By default, all violation messages are generated in the English language with pluralization capabilities.
// To use a custom language you have to load translations on validator initialization.
// Built-in translations are available in the sub-packages of the package "github.com/muonsoft/message/translations".
// The translation mechanism is provided by the "golang.org/x/text" package (be aware, it has no stable version yet).
func Translations(messages map[language.Tag]map[string]catalog.Message) ValidatorOption {
	return func(options *ValidatorOptions) error {
		options.translatorOptions = append(options.translatorOptions, translations.SetTranslations(messages))

		return nil
	}
}

// SetTranslator option is used to set up the custom implementation of message violation translator.
func SetTranslator(translator Translator) ValidatorOption {
	return func(options *ValidatorOptions) error {
		options.translator = translator

		return nil
	}
}

// SetViolationFactory option can be used to override the mechanism of violation creation.
func SetViolationFactory(factory ViolationFactory) ValidatorOption {
	return func(options *ValidatorOptions) error {
		options.violationFactory = factory

		return nil
	}
}

// StoredConstraint option can be used to store a constraint in an internal validator store.
// It can later be used by the validator.ValidateBy method. This can be useful for passing
// custom or prepared constraints to Validatable.
//
// If the constraint already exists, a ConstraintAlreadyStoredError will be returned.
func StoredConstraint(key string, constraint Constraint) ValidatorOption {
	return func(options *ValidatorOptions) error {
		if _, exists := options.constraints[key]; exists {
			return ConstraintAlreadyStoredError{Key: key}
		}

		options.constraints[key] = constraint

		return nil
	}
}

// Validate is the main validation method. It accepts validation arguments. executionContext can be
// used to tune up the validation process or to pass values of a specific type.
func (validator *Validator) Validate(ctx context.Context, arguments ...Argument) error {
	execContext := &executionContext{scope: validator.scope.withContext(ctx)}
	for _, argument := range arguments {
		argument.setUp(execContext)
	}

	violations := &ViolationList{}
	for _, validate := range execContext.validators {
		vs, err := validate(execContext.scope)
		if err != nil {
			return err
		}
		violations.Join(vs)
	}

	return violations.AsError()
}

// ValidateBool is an alias for validating a single boolean value.
func (validator *Validator) ValidateBool(ctx context.Context, value bool, constraints ...BoolConstraint) error {
	return validator.Validate(ctx, Bool(value, constraints...))
}

// ValidateInt is an alias for validating a single integer value.
func (validator *Validator) ValidateInt(ctx context.Context, value int, constraints ...NumberConstraint[int]) error {
	return validator.Validate(ctx, Number(value, constraints...))
}

// ValidateFloat is an alias for validating a single float value.
func (validator *Validator) ValidateFloat(ctx context.Context, value float64, constraints ...NumberConstraint[float64]) error {
	return validator.Validate(ctx, Number(value, constraints...))
}

// ValidateString is an alias for validating a single string value.
func (validator *Validator) ValidateString(ctx context.Context, value string, constraints ...StringConstraint) error {
	return validator.Validate(ctx, String(value, constraints...))
}

// ValidateStrings is an alias for validating slice of strings.
func (validator *Validator) ValidateStrings(ctx context.Context, values []string, constraints ...ComparablesConstraint[string]) error {
	return validator.Validate(ctx, Comparables(values, constraints...))
}

// ValidateCountable is an alias for validating a single countable value (an array, slice, or map).
func (validator *Validator) ValidateCountable(ctx context.Context, count int, constraints ...CountableConstraint) error {
	return validator.Validate(ctx, Countable(count, constraints...))
}

// ValidateTime is an alias for validating a single time value.
func (validator *Validator) ValidateTime(ctx context.Context, value time.Time, constraints ...TimeConstraint) error {
	return validator.Validate(ctx, Time(value, constraints...))
}

// ValidateEachString is an alias for validating each value of a strings slice.
func (validator *Validator) ValidateEachString(ctx context.Context, values []string, constraints ...StringConstraint) error {
	return validator.Validate(ctx, EachString(values, constraints...))
}

// ValidateIt is an alias for validating value that implements the Validatable interface.
func (validator *Validator) ValidateIt(ctx context.Context, validatable Validatable) error {
	return validator.Validate(ctx, Valid(validatable))
}

// ValidateBy is used to get the constraint from the internal validator store.
// If the constraint does not exist, then the validator will
// return a ConstraintNotFoundError during the validation process.
// For storing a constraint you should use the StoredConstraint option.
func (validator *Validator) ValidateBy(constraintKey string) Constraint {
	if constraint, exists := validator.scope.constraints[constraintKey]; exists {
		return constraint
	}

	return notFoundConstraint{key: constraintKey}
}

// WithGroups is used to execute conditional validation based on validation groups. It creates
// a new scoped validation with a given set of groups.
//
// By default, when validating an object all constraints of it will be checked whether or not
// they pass. In some cases, however, you will need to validate an object against
// only some specific group of constraints. To do this, you can organize each constraint
// into one or more validation groups and then apply validation against one group of constraints.
//
// Validation groups are working together only with validation groups passed
// to a constraint by WhenGroups() method. This method is implemented in all built-in constraints.
// If you want to use validation groups for your own constraints do not forget to implement
// this method in your constraint.
//
// Be careful, empty groups are considered as the default group. Its value is equal to the DefaultGroup ("default").
func (validator *Validator) WithGroups(groups ...string) *Validator {
	return newScopedValidator(validator.scope.withGroups(groups...))
}

// WithLanguage method creates a new scoped validator with a given language tag. All created violations
// will be translated into this language.
func (validator *Validator) WithLanguage(tag language.Tag) *Validator {
	return newScopedValidator(validator.scope.withLanguage(tag))
}

// AtProperty method creates a new scoped validator with injected property name element to scope property path.
func (validator *Validator) AtProperty(name string) *Validator {
	return newScopedValidator(validator.scope.AtProperty(name))
}

// AtIndex method creates a new scoped validator with injected array index element to scope property path.
func (validator *Validator) AtIndex(index int) *Validator {
	return newScopedValidator(validator.scope.AtIndex(index))
}

// BuildViolation can be used to build a custom violation on the client-side.
func (validator *Validator) BuildViolation(ctx context.Context, code, message string) *ViolationBuilder {
	return validator.scope.withContext(ctx).BuildViolation(code, message)
}


1		package validation
2
3		import (
4		"context"
5		"fmt"
6		"time"
7
8		"github.com/muonsoft/validation/message/translations"
9		"golang.org/x/text/language"
10		"golang.org/x/text/message/catalog"
11		)
12
13		// Validator is the main validation service. It can be created by NewValidator constructor.
14		// Also, you can use singleton version from the package "github.com/muonsoft/validation/validator".
15		type Validator struct {
16		scope Scope
17		}
18
19		// Translator is used to translate violation messages. By default, validator uses an implementation from
20		// "github.com/muonsoft/validation/message/translations" package based on "golang.org/x/text" package.
21		// You can set up your own implementation by using SetTranslator option.
22		type Translator interface {
23		Translate(tag language.Tag, message string, pluralCount int) string
24		}
25
26		// ValidatorOptions is a temporary structure for collecting functional options ValidatorOption.
27		type ValidatorOptions struct {
28		translatorOptions []translations.TranslatorOption
29		translator Translator
30		violationFactory ViolationFactory
31		constraints map[string]Constraint
32		}
33
34		func newValidatorOptions() *ValidatorOptions {
35	1	return &ValidatorOptions{
36		constraints: map[string]Constraint{},
37		}
38		}
39
40		// ValidatorOption is a base type for configuration options used to create a new instance of Validator.
41		type ValidatorOption func(options *ValidatorOptions) error
42
43		// NewValidator is a constructor for creating an instance of Validator.
44		// You can configure it by using validator options.
45		func NewValidator(options ...ValidatorOption) (*Validator, error) {
46	1	var err error
47
48	1	opts := newValidatorOptions()
49	1	for _, setOption := range options {
50	1	err = setOption(opts)
51	1	if err != nil {
52	1	return nil, err
53		}
54		}
55
56	1	if opts.translator != nil && len(opts.translatorOptions) > 0 {
57	1	return nil, errTranslatorOptionsDenied
58		}
59	1	if opts.translator == nil {
60	1	opts.translator, err = translations.NewTranslator(opts.translatorOptions...)
61	1	if err != nil {
62	1	return nil, fmt.Errorf("failed to set up default translator: %w", err)
63		}
64		}
65	1	if opts.violationFactory == nil {
66	1	opts.violationFactory = newViolationFactory(opts.translator)
67		}
68
69	1	validator := &Validator{scope: newScope(
70		opts.translator,
71		opts.violationFactory,
72		opts.constraints,
73		)}
74
75	1	return validator, nil
76		}
77
78		func newScopedValidator(scope Scope) *Validator {
79	1	return &Validator{scope: scope}
80		}
81
82		// DefaultLanguage option is used to set up the default language for translation of violation messages.
83		func DefaultLanguage(tag language.Tag) ValidatorOption {
84	1	return func(options *ValidatorOptions) error {
85	1	options.translatorOptions = append(options.translatorOptions, translations.DefaultLanguage(tag))
86
87	1	return nil
88		}
89		}
90
91		// Translations option is used to load translation messages into the validator.
92		//
93		// By default, all violation messages are generated in the English language with pluralization capabilities.
94		// To use a custom language you have to load translations on validator initialization.
95		// Built-in translations are available in the sub-packages of the package "github.com/muonsoft/message/translations".
96		// The translation mechanism is provided by the "golang.org/x/text" package (be aware, it has no stable version yet).
97		func Translations(messages map[language.Tag]map[string]catalog.Message) ValidatorOption {
98	1	return func(options *ValidatorOptions) error {
99	1	options.translatorOptions = append(options.translatorOptions, translations.SetTranslations(messages))
100
101	1	return nil
102		}
103		}
104
105		// SetTranslator option is used to set up the custom implementation of message violation translator.
106		func SetTranslator(translator Translator) ValidatorOption {
107	1	return func(options *ValidatorOptions) error {
108	1	options.translator = translator
109
110	1	return nil
111		}
112		}
113
114		// SetViolationFactory option can be used to override the mechanism of violation creation.
115		func SetViolationFactory(factory ViolationFactory) ValidatorOption {
116	1	return func(options *ValidatorOptions) error {
117	1	options.violationFactory = factory
118
119	1	return nil
120		}
121		}
122
123		// StoredConstraint option can be used to store a constraint in an internal validator store.
124		// It can later be used by the validator.ValidateBy method. This can be useful for passing
125		// custom or prepared constraints to Validatable.
126		//
127		// If the constraint already exists, a ConstraintAlreadyStoredError will be returned.
128		func StoredConstraint(key string, constraint Constraint) ValidatorOption {
129	1	return func(options *ValidatorOptions) error {
130	1	if _, exists := options.constraints[key]; exists {
131	1	return ConstraintAlreadyStoredError{Key: key}
132		}
133
134	1	options.constraints[key] = constraint
135
136	1	return nil
137		}
138		}
139
140		// Validate is the main validation method. It accepts validation arguments. executionContext can be
141		// used to tune up the validation process or to pass values of a specific type.
142		func (validator *Validator) Validate(ctx context.Context, arguments ...Argument) error {
143	1	execContext := &executionContext{scope: validator.scope.withContext(ctx)}
144	1	for _, argument := range arguments {
145	1	argument.setUp(execContext)
146	1	}
147	1
148		violations := &ViolationList{}
149		for _, validate := range execContext.validators {
150		vs, err := validate(execContext.scope)
151	1	if err != nil {
152	1	return err
153	1	}
154	1	violations.Join(vs)
155	1	}
156
157	1	return violations.AsError()
158		}
159
160	1	// ValidateBool is an alias for validating a single boolean value.
161		func (validator *Validator) ValidateBool(ctx context.Context, value bool, constraints ...BoolConstraint) error {
162		return validator.Validate(ctx, Bool(value, constraints...))
163		}
164
165	1	// ValidateInt is an alias for validating a single integer value.
166		func (validator *Validator) ValidateInt(ctx context.Context, value int, constraints ...NumberConstraint[int]) error {
167		return validator.Validate(ctx, Number(value, constraints...))
168		}
169
170	1	// ValidateFloat is an alias for validating a single float value.
171		func (validator *Validator) ValidateFloat(ctx context.Context, value float64, constraints ...NumberConstraint[float64]) error {
172		return validator.Validate(ctx, Number(value, constraints...))
173		}
174
175	1	// ValidateString is an alias for validating a single string value.
176		func (validator *Validator) ValidateString(ctx context.Context, value string, constraints ...StringConstraint) error {
177		return validator.Validate(ctx, String(value, constraints...))
178		}
179
180	1	// ValidateStrings is an alias for validating slice of strings.
181		func (validator *Validator) ValidateStrings(ctx context.Context, values []string, constraints ...ComparablesConstraint[string]) error {
182		return validator.Validate(ctx, Comparables(values, constraints...))
183		}
184
185		// ValidateCountable is an alias for validating a single countable value (an array, slice, or map).
186		func (validator *Validator) ValidateCountable(ctx context.Context, count int, constraints ...CountableConstraint) error {
187		return validator.Validate(ctx, Countable(count, constraints...))
188		}
189
190	1	// ValidateTime is an alias for validating a single time value.
191		func (validator *Validator) ValidateTime(ctx context.Context, value time.Time, constraints ...TimeConstraint) error {
192		return validator.Validate(ctx, Time(value, constraints...))
193		}
194
195	1	// ValidateEachString is an alias for validating each value of a strings slice.
196		func (validator *Validator) ValidateEachString(ctx context.Context, values []string, constraints ...StringConstraint) error {
197		return validator.Validate(ctx, EachString(values, constraints...))
198		}
199
200	1	// ValidateIt is an alias for validating value that implements the Validatable interface.
201		func (validator *Validator) ValidateIt(ctx context.Context, validatable Validatable) error {
202		return validator.Validate(ctx, Valid(validatable))
203		}
204
205	1	// ValidateBy is used to get the constraint from the internal validator store.
206		// If the constraint does not exist, then the validator will
207		// return a ConstraintNotFoundError during the validation process.
208		// For storing a constraint you should use the StoredConstraint option.
209		func (validator *Validator) ValidateBy(constraintKey string) Constraint {
210	1	if constraint, exists := validator.scope.constraints[constraintKey]; exists {
211		return constraint
212		}
213
214		return notFoundConstraint{key: constraintKey}
215	1	}
216
217		// WithGroups is used to execute conditional validation based on validation groups. It creates
218		// a new scoped validation with a given set of groups.
219		//
220		// By default, when validating an object all constraints of it will be checked whether or not
221		// they pass. In some cases, however, you will need to validate an object against
222		// only some specific group of constraints. To do this, you can organize each constraint
223	1	// into one or more validation groups and then apply validation against one group of constraints.
224	1	//
225		// Validation groups are working together only with validation groups passed
226		// to a constraint by WhenGroups() method. This method is implemented in all built-in constraints.
227	1	// If you want to use validation groups for your own constraints do not forget to implement
228		// this method in your constraint.
229		//
230		// Be careful, empty groups are considered as the default group. Its value is equal to the DefaultGroup ("default").
231		func (validator Validator) WithGroups(groups ...string) Validator {
232		return newScopedValidator(validator.scope.withGroups(groups...))
233		}
234
235		// WithLanguage method creates a new scoped validator with a given language tag. All created violations
236		// will be translated into this language.
237		func (validator Validator) WithLanguage(tag language.Tag) Validator {
238		return newScopedValidator(validator.scope.withLanguage(tag))
239		}
240
241		// AtProperty method creates a new scoped validator with injected property name element to scope property path.
242		func (validator Validator) AtProperty(name string) Validator {
243		return newScopedValidator(validator.scope.AtProperty(name))
244		}
245	1
246		// AtIndex method creates a new scoped validator with injected array index element to scope property path.
247		func (validator Validator) AtIndex(index int) Validator {
248		return newScopedValidator(validator.scope.AtIndex(index))
249		}
250
251	1	// BuildViolation can be used to build a custom violation on the client-side.
252		func (validator Validator) BuildViolation(ctx context.Context, code, message string) ViolationBuilder {
253		return validator.scope.withContext(ctx).BuildViolation(code, message)
254		}
255

muonsoft / validation

Pull Request — main (#71)

validator.go B

Size/Duplication

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Importance

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