[ABW-3454] iOS - Display proper error messages for Sargon errors

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sargon"
-version = "1.0.15"
+version = "1.0.16"
 edition = "2021"
 build = "build.rs"
 

apple/Sources/Sargon/Extensions/Swiftified/Prelude/SargonError+Swiftified.swift

@@ -1,3 +1,4 @@
+import Foundation
 import SargonUniFFI
 
 public typealias SargonError = CommonError
@@ -15,3 +16,13 @@ extension SargonError: CustomStringConvertible {
 		errorMessage
 	}
 }
+
+extension SargonError: LocalizedError {
+	public var errorDescription: String? {
+		let errorCodeFormatted = "Error code: \(errorCode)"
+		let errorMessageFormatted: String? = isSafeToShowErrorMessageFromError(error: self) ? "Error message: \(errorMessage)" : nil
+		return [errorCodeFormatted, errorMessageFormatted]
+					.compactMap { $0 }
+					.joined(separator: "\n")
+	}
+}

apple/Tests/TestCases/Prelude/SargonErrorTests.swift

@@ -23,4 +23,14 @@ final class SargonErrorTests: Test<SargonError> {
 		let sut = SUT.UnknownNetworkForId(badValue: 99)
 		XCTAssertEqual(sut.debugDescription, "10049: No network found with id: '99'")
 	}
+
+	func test_localized_description_for_sensitive_error() {
+		let sut = SUT.UnknownNetworkForId(badValue: 99)
+		XCTAssertEqual(sut.localizedDescription, "Error code: 10049")
+	}
+
+	func test_localized_description_for_non_sensitive_error() {
+		let sut = SUT.FailedToDeserializeJsonToValue(jsonByteCount: 100, typeName: "TypeName", serdeMessage: "serdeMessage")
+		XCTAssertEqual(sut.localizedDescription, "Error code: 10070\nError message: Failed deserialize JSON with #100 bytes to value of type TypeName with error: \"serdeMessage\"")
+	} 
 }

src/core/error/common_error.rs

@@ -508,13 +508,22 @@ impl CommonError {
     pub fn error_code(&self) -> u32 {
         unsafe { *<*const _>::from(self).cast::<u32>() }
     }
+
+    pub fn is_safe_to_show_error_message(&self) -> bool {
+        matches!(self, CommonError::FailedToDeserializeJSONToValue { .. })
+    }
 }
 
 #[uniffi::export]
 pub fn error_code_from_error(error: &CommonError) -> u32 {
     error.error_code()
 }
 
+#[uniffi::export]
+pub fn is_safe_to_show_error_message_from_error(error: &CommonError) -> bool {
+    error.is_safe_to_show_error_message()
+}
+
 #[cfg(test)]
 mod tests {
     use crate::prelude::*;
@@ -533,4 +542,20 @@ mod tests {
         let sut = CommonError::UnknownNetworkForID { bad_value: 0 };
         assert_eq!(error_code_from_error(&sut), 10049);
     }
+
+    #[test]
+    fn is_safe_to_show_error_message() {
+        let sut = CommonError::FailedToDeserializeJSONToValue {
+            json_byte_count: 100,
+            type_name: "TypeName".to_string(),
+            serde_message: "message".to_string(),
+        };
+        assert!(is_safe_to_show_error_message_from_error(&sut));
+    }
+
+    #[test]
+    fn is_not_safe_to_show_error_message() {
+        let sut = CommonError::UnknownNetworkForID { bad_value: 0 };
+        assert!(!is_safe_to_show_error_message_from_error(&sut));
+    }
 }