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Introduce stringvalidator package (#22)
Reference: #3
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8 files changed

+423
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8 files changed

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‎.changelog/22.txt‎

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```release-note:feature
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Introduced `stringvalidator` package with `LengthAtLeast()`, `LengthAtMost()`, and `LengthBetween()` validation functions
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```

‎stringvalidator/length_at_least.go‎

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package stringvalidator
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import (
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"context"
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"fmt"
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"github.com/hashicorp/terraform-plugin-framework-validators/validatordiag"
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"github.com/hashicorp/terraform-plugin-framework/tfsdk"
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)
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var _ tfsdk.AttributeValidator = lengthAtLeastValidator{}
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// stringLenAtLeastValidator validates that a string Attribute's length is at least a certain value.
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type lengthAtLeastValidator struct {
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minLength int
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}
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// Description describes the validation in plain text formatting.
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func (validator lengthAtLeastValidator) Description(_ context.Context) string {
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return fmt.Sprintf("string length must be at least %d", validator.minLength)
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}
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// MarkdownDescription describes the validation in Markdown formatting.
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func (validator lengthAtLeastValidator) MarkdownDescription(ctx context.Context) string {
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return validator.Description(ctx)
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}
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// Validate performs the validation.
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func (validator lengthAtLeastValidator) Validate(ctx context.Context, request tfsdk.ValidateAttributeRequest, response *tfsdk.ValidateAttributeResponse) {
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s, ok := validateString(ctx, request, response)
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if !ok {
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return
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}
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if l := len(s); l < validator.minLength {
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response.Diagnostics.Append(validatordiag.AttributeValueLengthDiagnostic(
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request.AttributePath,
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validator.Description(ctx),
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fmt.Sprintf("%d", l),
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))
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return
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}
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}
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// LengthAtLeast returns an AttributeValidator which ensures that any configured
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// attribute value:
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//
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// - Is a string.
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// - Is of length exclusively greater than the given minimum.
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//
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// Null (unconfigured) and unknown (known after apply) values are skipped.
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func LengthAtLeast(minLength int) tfsdk.AttributeValidator {
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if minLength < 0 {
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return nil
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}
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return lengthAtLeastValidator{
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minLength: minLength,
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}
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}

‎stringvalidator/length_at_least_test.go‎

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package stringvalidator
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import (
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"context"
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"testing"
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"github.com/hashicorp/terraform-plugin-framework/attr"
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"github.com/hashicorp/terraform-plugin-framework/tfsdk"
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"github.com/hashicorp/terraform-plugin-framework/types"
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"github.com/hashicorp/terraform-plugin-go/tftypes"
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)
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func TestLengthAtLeastValidator(t *testing.T) {
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t.Parallel()
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type testCase struct {
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val attr.Value
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minLength int
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expectError bool
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}
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tests := map[string]testCase{
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"not a String": {
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val: types.Bool{Value: true},
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expectError: true,
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},
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"unknown String": {
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val: types.String{Unknown: true},
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minLength: 1,
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},
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"null String": {
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val: types.String{Null: true},
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minLength: 1,
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},
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"valid String": {
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val: types.String{Value: "ok"},
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minLength: 1,
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},
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"too short String": {
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val: types.String{Value: ""},
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minLength: 1,
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expectError: true,
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},
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}
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for name, test := range tests {
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name, test := name, test
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t.Run(name, func(t *testing.T) {
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request := tfsdk.ValidateAttributeRequest{
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AttributePath: tftypes.NewAttributePath().WithAttributeName("test"),
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AttributeConfig: test.val,
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}
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response := tfsdk.ValidateAttributeResponse{}
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LengthAtLeast(test.minLength).Validate(context.TODO(), request, &response)
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if !response.Diagnostics.HasError() && test.expectError {
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t.Fatal("expected error, got no error")
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}
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if response.Diagnostics.HasError() && !test.expectError {
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t.Fatalf("got unexpected error: %s", response.Diagnostics)
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}
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})
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}
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}

‎stringvalidator/length_at_most.go‎

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package stringvalidator
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import (
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"context"
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"fmt"
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"github.com/hashicorp/terraform-plugin-framework-validators/validatordiag"
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"github.com/hashicorp/terraform-plugin-framework/tfsdk"
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"github.com/hashicorp/terraform-plugin-framework/types"
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)
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var _ tfsdk.AttributeValidator = lengthAtMostValidator{}
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// lengthAtMostValidator validates that a string Attribute's length is at most a certain value.
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type lengthAtMostValidator struct {
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maxLength int
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}
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// Description describes the validation in plain text formatting.
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func (validator lengthAtMostValidator) Description(_ context.Context) string {
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return fmt.Sprintf("string length must be at most %d", validator.maxLength)
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}
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// MarkdownDescription describes the validation in Markdown formatting.
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func (validator lengthAtMostValidator) MarkdownDescription(ctx context.Context) string {
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return validator.Description(ctx)
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}
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// Validate performs the validation.
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func (validator lengthAtMostValidator) Validate(ctx context.Context, request tfsdk.ValidateAttributeRequest, response *tfsdk.ValidateAttributeResponse) {
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s, ok := validateString(ctx, request, response)
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if !ok {
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return
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}
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if l := len(s); l > validator.maxLength {
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response.Diagnostics.Append(validatordiag.AttributeValueLengthDiagnostic(
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request.AttributePath,
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validator.Description(ctx),
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fmt.Sprintf("%d", l),
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))
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return
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}
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}
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// LengthAtMost returns an AttributeValidator which ensures that any configured
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// attribute value:
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//
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// - Is a string.
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// - Is of length exclusively less than the given maximum.
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//
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// Null (unconfigured) and unknown (known after apply) values are skipped.
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func LengthAtMost(maxLength int) tfsdk.AttributeValidator {
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if maxLength < 0 {
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return nil
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}
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return lengthAtMostValidator{
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maxLength: maxLength,
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}
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}
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// validateString ensures that the request contains a String value.
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func validateString(ctx context.Context, request tfsdk.ValidateAttributeRequest, response *tfsdk.ValidateAttributeResponse) (string, bool) {
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var s types.String
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diags := tfsdk.ValueAs(ctx, request.AttributeConfig, &s)
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if diags.HasError() {
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response.Diagnostics = append(response.Diagnostics, diags...)
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return "", false
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}
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if s.Unknown || s.Null {
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return "", false
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}
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return s.Value, true
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}

‎stringvalidator/length_at_most_test.go‎

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package stringvalidator
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import (
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"context"
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"testing"
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"github.com/hashicorp/terraform-plugin-framework/attr"
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"github.com/hashicorp/terraform-plugin-framework/tfsdk"
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"github.com/hashicorp/terraform-plugin-framework/types"
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"github.com/hashicorp/terraform-plugin-go/tftypes"
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)
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func TestLengthAtMostValidator(t *testing.T) {
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t.Parallel()
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type testCase struct {
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val attr.Value
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maxLength int
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expectError bool
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}
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tests := map[string]testCase{
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"not a String": {
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val: types.Bool{Value: true},
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expectError: true,
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},
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"unknown String": {
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val: types.String{Unknown: true},
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maxLength: 1,
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},
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"null String": {
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val: types.String{Null: true},
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maxLength: 1,
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},
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"valid String": {
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val: types.String{Value: "ok"},
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maxLength: 2,
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},
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"too long String": {
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val: types.String{Value: "not ok"},
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maxLength: 5,
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expectError: true,
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},
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}
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for name, test := range tests {
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name, test := name, test
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t.Run(name, func(t *testing.T) {
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request := tfsdk.ValidateAttributeRequest{
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AttributePath: tftypes.NewAttributePath().WithAttributeName("test"),
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AttributeConfig: test.val,
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}
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response := tfsdk.ValidateAttributeResponse{}
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LengthAtMost(test.maxLength).Validate(context.TODO(), request, &response)
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if !response.Diagnostics.HasError() && test.expectError {
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t.Fatal("expected error, got no error")
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}
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if response.Diagnostics.HasError() && !test.expectError {
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t.Fatalf("got unexpected error: %s", response.Diagnostics)
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}
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})
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}
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}

‎stringvalidator/length_between.go‎

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package stringvalidator
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import (
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"context"
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"fmt"
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"github.com/hashicorp/terraform-plugin-framework-validators/validatordiag"
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"github.com/hashicorp/terraform-plugin-framework/tfsdk"
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)
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var _ tfsdk.AttributeValidator = lengthBetweenValidator{}
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// stringLenBetweenValidator validates that a string Attribute's length is in a range.
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type lengthBetweenValidator struct {
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minLength, maxLength int
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}
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// Description describes the validation in plain text formatting.
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func (validator lengthBetweenValidator) Description(_ context.Context) string {
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return fmt.Sprintf("string length must be between %d and %d", validator.minLength, validator.maxLength)
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}
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// MarkdownDescription describes the validation in Markdown formatting.
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func (validator lengthBetweenValidator) MarkdownDescription(ctx context.Context) string {
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return validator.Description(ctx)
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}
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// Validate performs the validation.
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func (validator lengthBetweenValidator) Validate(ctx context.Context, request tfsdk.ValidateAttributeRequest, response *tfsdk.ValidateAttributeResponse) {
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s, ok := validateString(ctx, request, response)
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if !ok {
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return
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}
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if l := len(s); l < validator.minLength || l > validator.maxLength {
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response.Diagnostics.Append(validatordiag.AttributeValueLengthDiagnostic(
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request.AttributePath,
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validator.Description(ctx),
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fmt.Sprintf("%d", l),
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))
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return
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}
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}
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// LengthBetween returns an AttributeValidator which ensures that any configured
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// attribute value:
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//
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// - Is a string.
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// - Is of length greater than the given minimum and less than the given maximum.
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//
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// Null (unconfigured) and unknown (known after apply) values are skipped.
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func LengthBetween(minLength, maxLength int) tfsdk.AttributeValidator {
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if minLength < 0 || maxLength < 0 || minLength > maxLength {
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return nil
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}
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return lengthBetweenValidator{
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minLength: minLength,
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maxLength: maxLength,
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}
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}

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