fix: crash when converting infinite values to JSON string (#66)

Co-authored-by: xiaoweii <xiaoweii@amazom.com>

Author: zhu-xiaowei

Sources/Clickstream/Dependency/Clickstream/ClickstreamContext.swift

@@ -124,7 +124,7 @@ extension UserDefaults: UserDefaultsBehaviour {
         self.globalAttributes = globalAttributes
         return self
     }
-    
+
     public func withInitialGlobalAttributesObjc(_ globalAttributes: NSDictionary) -> ClickstreamConfiguration {
         self.globalAttributes = ClickstreamObjc.getAttributes(globalAttributes)
         return self

Sources/Clickstream/Dependency/Clickstream/Event/Event.swift

@@ -93,6 +93,7 @@ enum Event {
         static let ATTRIBUTE_NAME_INVALID = 2_002
         static let ATTRIBUTE_VALUE_LENGTH_EXCEED = 2_003
         static let ATTRIBUTE_SIZE_EXCEED = 2_004
+        static let ATTRIBUTE_VALUE_INFINITE = 2_005
         static let USER_ATTRIBUTE_SIZE_EXCEED = 3_001
         static let USER_ATTRIBUTE_NAME_LENGTH_EXCEED = 3_002
         static let USER_ATTRIBUTE_NAME_INVALID = 3_003

Sources/Clickstream/Dependency/Clickstream/Event/EventChecker.swift

@@ -82,13 +82,35 @@ class EventChecker {
                 error.errorCode = Event.ErrorCode.ATTRIBUTE_VALUE_LENGTH_EXCEED
                 error.errorMessage = getErrorMessage(errorString)
             }
+        } else if !checkFinite(value) {
+            errorMsg = """
+            the value for attribute : \(key), is infinite\
+             and the attribute will not be recorded
+            """
+            let errorString = "the value for attribute name: \(key) is infinite"
+            error.errorCode = Event.ErrorCode.ATTRIBUTE_VALUE_INFINITE
+            error.errorMessage = getErrorMessage(errorString)
         }
         if errorMsg != nil {
             log.warn(errorMsg!)
         }
         return error
     }
 
+    /// Check the Dboule or Decimal whether is finite
+    /// - Parameters:
+    ///   - value: attribute value
+    /// - Returns: the isFinite boolean result
+    static func checkFinite(_ value: Any) -> Bool {
+        if let value = value as? Double, !value.isFinite {
+            return false
+        }
+        if let value = value as? Decimal, !value.isFinite {
+            return false
+        }
+        return true
+    }
+
     /// Check the user attribute error.
     /// - Parameters:
     ///   - currentNumber: current attribute number

Tests/ClickstreamTests/Clickstream/ClickstreamEventTest.swift

@@ -63,6 +63,24 @@ class ClickstreamEventTest: XCTestCase {
         XCTAssertTrue(errorValueString.contains("testKey"))
     }
 
+    func testAddAttributeErrorForDoubleValueisNotFinite() {
+        clickstreamEvent.addAttribute(Double.infinity, forKey: "testKey")
+        XCTAssertNil(clickstreamEvent.attribute(forKey: "testKey"))
+        let errorCode = clickstreamEvent.attribute(forKey: Event.ReservedAttribute.ERROR_CODE) as! Int
+        let errorValueString = clickstreamEvent.attribute(forKey: Event.ReservedAttribute.ERROR_MESSAGE) as! String
+        XCTAssertEqual(Event.ErrorCode.ATTRIBUTE_VALUE_INFINITE, errorCode)
+        XCTAssertTrue(errorValueString.contains("testKey"))
+    }
+
+    func testAddAttributeErrorForDecimalValueisNotFinite() {
+        clickstreamEvent.addAttribute(Decimal.nan, forKey: "testKey")
+        XCTAssertNil(clickstreamEvent.attribute(forKey: "testKey"))
+        let errorCode = clickstreamEvent.attribute(forKey: Event.ReservedAttribute.ERROR_CODE) as! Int
+        let errorValueString = clickstreamEvent.attribute(forKey: Event.ReservedAttribute.ERROR_MESSAGE) as! String
+        XCTAssertEqual(Event.ErrorCode.ATTRIBUTE_VALUE_INFINITE, errorCode)
+        XCTAssertTrue(errorValueString.contains("testKey"))
+    }
+
     func testAddItemWithCustomAttributeScuccess() {
         let item: ClickstreamAttribute = [
             ClickstreamAnalytics.Item.ITEM_ID: 123,

Tests/ClickstreamTests/EventCheckerTest.swift

@@ -25,4 +25,28 @@ class EventCheckerTest: XCTestCase {
         XCTAssertFalse(EventChecker.checkEventType(eventType: "9Abc").errorCode == noError)
         XCTAssertTrue(EventChecker.checkEventType(eventType: "A9bc").errorCode == noError)
     }
+
+    func testDoubleIsFinite() {
+        XCTAssertTrue(EventChecker.checkFinite(123.31))
+        XCTAssertTrue(EventChecker.checkFinite(355 / 113.0))
+        XCTAssertTrue(EventChecker.checkFinite(0))
+        XCTAssertTrue(EventChecker.checkFinite(Double.pi))
+        XCTAssertTrue(EventChecker.checkFinite(Double.leastNormalMagnitude))
+        XCTAssertTrue(EventChecker.checkFinite(Double.leastNonzeroMagnitude))
+        XCTAssertTrue(EventChecker.checkFinite(Double.ulpOfOne))
+        XCTAssertFalse(EventChecker.checkFinite(Double.nan))
+        XCTAssertFalse(EventChecker.checkFinite(Double.infinity))
+        XCTAssertFalse(EventChecker.checkFinite(-Double.infinity))
+        XCTAssertFalse(EventChecker.checkFinite(Double.signalingNaN))
+    }
+
+    func testDecimalIsFinite() {
+        XCTAssertTrue(EventChecker.checkFinite(Decimal.pi))
+        XCTAssertTrue(EventChecker.checkFinite(Decimal.leastNormalMagnitude))
+        XCTAssertTrue(EventChecker.checkFinite(Decimal.leastNonzeroMagnitude))
+        XCTAssertTrue(EventChecker.checkFinite(Decimal.greatestFiniteMagnitude))
+        XCTAssertTrue(EventChecker.checkFinite(Decimal.leastFiniteMagnitude))
+        XCTAssertFalse(EventChecker.checkFinite(Decimal.nan))
+        XCTAssertFalse(EventChecker.checkFinite(Decimal.quietNaN))
+    }
 }