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length_at_least.go
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length_at_least.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/schema/validator"
"github.com/hashicorp/terraform-plugin-framework-validators/helpers/validatordiag"
)
var _ validator.String = lengthAtLeastValidator{}
// stringLenAtLeastValidator validates that a string Attribute's length is at least a certain value.
type lengthAtLeastValidator struct {
minLength int
}
// Description describes the validation in plain text formatting.
func (validator lengthAtLeastValidator) Description(_ context.Context) string {
return fmt.Sprintf("string length must be at least %d", validator.minLength)
}
// MarkdownDescription describes the validation in Markdown formatting.
func (validator lengthAtLeastValidator) MarkdownDescription(ctx context.Context) string {
return validator.Description(ctx)
}
// Validate performs the validation.
func (v lengthAtLeastValidator) 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 {
response.Diagnostics.Append(validatordiag.InvalidAttributeValueLengthDiagnostic(
request.Path,
v.Description(ctx),
fmt.Sprintf("%d", l),
))
return
}
}
// LengthAtLeast returns an validator which ensures that any configured
// attribute value is of single-byte character length greater than or equal
// to the given minimum. Null (unconfigured) and unknown (known after apply)
// values are skipped.
//
// Use UTF8LengthAtLeast for checking multiple-byte characters.
func LengthAtLeast(minLength int) validator.String {
if minLength < 0 {
return nil
}
return lengthAtLeastValidator{
minLength: minLength,
}
}