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length_between.go
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length_between.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package stringvalidator
import (
"context"
"fmt"
"github.com/hashicorp/terraform-plugin-framework-validators/helpers/validatordiag"
"github.com/hashicorp/terraform-plugin-framework/schema/validator"
)
var _ validator.String = lengthBetweenValidator{}
// stringLenBetweenValidator validates that a string Attribute's length is in a range.
type lengthBetweenValidator struct {
minLength, maxLength int
}
// Description describes the validation in plain text formatting.
func (validator lengthBetweenValidator) Description(_ context.Context) string {
return fmt.Sprintf("string length must be between %d and %d", validator.minLength, validator.maxLength)
}
// MarkdownDescription describes the validation in Markdown formatting.
func (validator lengthBetweenValidator) MarkdownDescription(ctx context.Context) string {
return validator.Description(ctx)
}
// Validate performs the validation.
func (v lengthBetweenValidator) ValidateString(ctx context.Context, request validator.StringRequest, response *validator.StringResponse) {
if request.ConfigValue.IsNull() || request.ConfigValue.IsUnknown() {
return
}
value := request.ConfigValue.ValueString()
if l := len(value); l < v.minLength || l > v.maxLength {
response.Diagnostics.Append(validatordiag.InvalidAttributeValueLengthDiagnostic(
request.Path,
v.Description(ctx),
fmt.Sprintf("%d", l),
))
return
}
}
// LengthBetween returns a validator which ensures that any configured
// attribute value is of single-byte character length greater than or equal
// to the given minimum and less than or equal to the given maximum. Null
// (unconfigured) and unknown (known after apply) values are skipped.
//
// Use UTF8LengthBetween for checking multiple-byte characters.
func LengthBetween(minLength, maxLength int) validator.String {
if minLength < 0 || minLength > maxLength {
return nil
}
return lengthBetweenValidator{
minLength: minLength,
maxLength: maxLength,
}
}