Fix type assertion safety issues in DTO conversions and data transformations

[Copilot]

This PR fixes critical type safety issues in Data Transfer Object (DTO) conversions and data transformation operations that could cause runtime panics in the Terraform provider.

Issues Fixed

1. Unchecked Type Assertions in tenant_settings/dto.go

Multiple conversion functions performed unsafe type assertions like object.(basetypes.ObjectValue) without checking for assertion failures:

// Before - unsafe
teamIntegrationObject.(basetypes.ObjectValue).As(ctx, &teamsIntegrationSettings, ...)

// After - safe
objectValue, ok := teamIntegrationObject.(basetypes.ObjectValue)
if !ok {
    return // Skip conversion if type assertion fails
}
objectValue.As(ctx, &teamsIntegrationSettings, ...)

2. Unchecked Type Assertions in environment_group_rule_set/dto.go

Similar unsafe patterns in AI generative settings, backup retention, and other conversion functions:

// Before - unsafe
aiGenerativeSettingsObj.(basetypes.ObjectValue).As(ctx, &aiGenerativeSettings, ...)

// After - safe with error handling
objectValue, ok := aiGenerativeSettingsObj.(basetypes.ObjectValue)
if !ok {
    return fmt.Errorf("expected ai_generative_settings to be of type ObjectValue, got %T", aiGenerativeSettingsObj)
}

3. Ignored Error Returns in dlp_policy/helpers.go

The convertToDlpEnvironment function ignored error returns from ElementsAs:

// Before - ignored errors
func convertToDlpEnvironment(ctx context.Context, environmentsInPolicy basetypes.SetValue) []dlpEnvironmentDto {
    envs := []string{}
    environmentsInPolicy.ElementsAs(ctx, &envs, true) // Error ignored
    // ...
}

// After - proper error handling
func convertToDlpEnvironment(ctx context.Context, environmentsInPolicy basetypes.SetValue) ([]dlpEnvironmentDto, error) {
    envs := []string{}
    if err := environmentsInPolicy.ElementsAs(ctx, &envs, true); err != nil {
        return nil, fmt.Errorf("failed to convert environments: %v", err)
    }
    // ...
}

4. Silent Type Assertion Failures in data_record/resource_data_record.go

Case functions silently ignored type assertion failures, leading to missing data:

// Before - silent failures
func caseString(columnValue any, attrValue map[string]attr.Value, attrType map[string]attr.Type, key string) {
    value, ok := columnValue.(string)
    if ok {
        // Only set value if assertion succeeded, silently ignore failures
    }
}

// After - debug logging for failures
func caseString(columnValue any, attrValue map[string]attr.Value, attrType map[string]attr.Type, key string) {
    value, ok := columnValue.(string)
    if !ok {
        tflog.Debug(context.TODO(), "caseString: failed to cast value to string", 
            map[string]any{"key": key, "value_type": fmt.Sprintf("%T", columnValue)})
        return
    }
    // Set value...
}

5. Incomplete Type Support in customtypes/uuid_type.go

The UUID type equality method only supported value types, not pointer types:

// Before - only value type support
func (t UUIDType) Equal(o attr.Type) bool {
    other, ok := o.(UUIDType)
    if !ok {
        return false
    }
    return t.StringType.Equal(other.StringType)
}

// After - supports both value and pointer types
func (t UUIDType) Equal(o attr.Type) bool {
    switch v := o.(type) {
    case UUIDType:
        return t.StringType.Equal(v.StringType)
    case *UUIDType:
        return t.StringType.Equal(v.StringType)
    default:
        return false
    }
}

Impact

These fixes prevent:

• Runtime panics from failed type assertions that could crash the provider
• Silent data loss from ignored conversion failures
• Inconsistent behavior when working with different type representations
• Difficult debugging by adding proper error logging and handling

Testing

• ✅ All existing linter checks pass
• ✅ Build and compilation successful
• ✅ Documentation generation works correctly
• ✅ Minimal code changes with no breaking functionality

Fixes #840.

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[Copilot]

Pull Request Overview

This PR enhances type safety and error handling across DTO conversions to prevent panics and silent failures.

• Replace unchecked type assertions with safe checks and skips or error returns in tenant_settings and environment_group_rule_set.
• Handle and propagate errors from ElementsAs in DLP helper functions and update resource callers.
• Add debug logging for cast failures in data_record converters and extend UUID type equality to support pointer types.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/services/tenant_settings/dto.go	Wrap unsafe assertions with ok checks and skip on failure
internal/services/environment_group_rule_set/dto.go	Use safe assertions with error returns or skips for conversions
internal/services/dlp_policy/helpers.go	Change convertToDlpEnvironment to return an error on failure
internal/services/dlp_policy/resource_dlp_policy.go	Update callers to handle convertToDlpEnvironment errors
internal/services/data_record/resource_data_record.go	Add debug logs for failed type casts in case* functions
internal/customtypes/uuid_type.go	Extend Equal method to handle both value and pointer types

Comments suppressed due to low confidence (4)

internal/services/tenant_settings/dto.go:222

• Add unit tests for the failure path when type assertions return !ok to ensure correct skip behavior is exercised.

objectValue, ok := teamIntegrationObject.(basetypes.ObjectValue)

internal/services/dlp_policy/resource_dlp_policy.go:335

• [nitpick] Enhance the diagnostic detail by including contextual information (e.g. which field or index failed) rather than only err.Error().

if err != nil {

internal/customtypes/uuid_type.go:22

• [nitpick] Consider adding a doc comment for Equal to explain why pointer types are now supported and any implications for consumers.

func (t UUIDType) Equal(o attr.Type) bool {

internal/services/dlp_policy/helpers.go:221

• Update or add a function comment to reflect the new error return so callers understand that failures will now bubble up.

func convertToDlpEnvironment(ctx context.Context, environmentsInPolicy basetypes.SetValue) ([]dlpEnvironmentDto, error) {