/
set.go
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/
set.go
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// Copyright Axis Communications AB.
//
// For a full list of individual contributors, please see the commit history.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package validator
import (
"context"
"net/http"
)
// Validator is capable of applying some set of rules to validate
// the correctness of an event.
type Validator interface {
Validate(ctx context.Context, event []byte) error
}
// ValidatorSet contains an ordered set of one or more Validator
// instances. The set can validate events against all validators
// in the set and require all validators to give a passing grade.
type ValidatorSet struct {
validators []Validator
}
// NewSet returns a ValidatorSet containing the specified Validator pointers.
func NewSet(validators ...Validator) *ValidatorSet {
return &ValidatorSet{
validators: validators,
}
}
// Add appends one or more validators to the current set.
func (vs *ValidatorSet) Add(validators ...Validator) {
vs.validators = append(vs.validators, validators...)
}
// Validate loops over the Validator instances in the set and asks them to
// validate the given event. The loop will terminate upon the first validation
// error, i.e. all validators aren't guaranteed to be called.
func (vs *ValidatorSet) Validate(ctx context.Context, event []byte) error {
for _, v := range vs.validators {
if ctx.Err() != nil {
return ctx.Err()
}
if err := v.Validate(ctx, event); err != nil {
return err
}
}
return nil
}
// DefaultSet returns the currently recommended set of validators,
// each with a default configuration.
func DefaultSet() *ValidatorSet {
return NewSet(
NewSchemaValidator(
NewMetaSchemaLocator(http.DefaultClient),
NewBundledSchemaLocator(),
),
)
}