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feat: add JSON string support for ABAC enforcement #59

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Merged
nomeguy merged 7 commits into from
Dec 7, 2025
Merged

feat: add JSON string support for ABAC enforcement #59

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8d263d5
Initial plan
Copilot Nov 17, 2025
2b9792c
Initial plan for ABAC JSON support
Copilot Nov 17, 2025
f2e3054
Add ABAC JSON string support with comprehensive tests
Copilot Nov 17, 2025
6490000
Add Flutter example and update README with JSON ABAC documentation
Copilot Nov 17, 2025
ccc45df
Add test validating exact GitHub issue scenario
Copilot Nov 17, 2025
305682b
Remove tests, examples, and README changes - keep only core functiona…
Copilot Dec 6, 2025
0ca4322
Fix code formatting to pass CI check
Copilot Dec 6, 2025
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39 changes: 37 additions & 2 deletions lib/src/utils/utils.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -12,18 +12,53 @@
// See the License for the specific language governing permissions and
// limitations under the License.

import 'dart:convert';

import 'package:collection/collection.dart';
import 'package:expressions/expressions.dart';

import '../abac/abac_class.dart';
import '../model/assertion.dart';

class CasbinEvaluator extends ExpressionEvaluator {
const CasbinEvaluator();

@override
dynamic evalMemberExpression(
MemberExpression expression, Map<String, dynamic> context) {
var object = eval(expression.object, context).toMap();
MemberExpression expression,
Map<String, dynamic> context,
) {
var objectValue = eval(expression.object, context);
Map<String, dynamic> object;

// Handle different types of objects
if (objectValue is String) {
// Try to parse as JSON
try {
var parsed = jsonDecode(objectValue);
if (parsed is Map<String, dynamic>) {
object = parsed;
} else {
throw Exception('JSON string must represent an object/map');
}
} catch (e) {
throw Exception('Failed to parse JSON string: $e');
}
} else if (objectValue is AbacClass) {
object = objectValue.toMap();
} else if (objectValue is Map<String, dynamic>) {
object = objectValue;
} else {
// Fall back to trying toMap() for backward compatibility
try {
object = objectValue.toMap();
} catch (e) {
throw Exception(
'Object must be a JSON string, Map, or implement AbacClass: ${objectValue.runtimeType}',
);
}
}

return object[expression.property.name];
}
}
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