ios expose constantsController #446

ios/core/Sources/Player/HeadlessPlayer.swift

@@ -137,6 +137,8 @@
     var hooks: HooksType? { get }
     /// A logger reference for use in plugins to log through the shared player logger
     var logger: TapableLogger { get }
+    /// A reference to the Key/Value store for constants and context for player
+    var constantsController: ConstantsController? { get }
 
     /**
      Sets up the core javascript player in the given context
@@ -169,6 +171,15 @@
         else { return nil }
         return BaseFlowState.createInstance(value: jsState)
     }
+
+    var constantsController: ConstantsController? {
+        guard 
+            let constantControllerJSValue = jsPlayerReference?.objectForKeyedSubscript("constantsController") 
+        else {
+            return nil
+        }
+        return ConstantsController(constantsController: constantControllerJSValue)
+    }
 
     /**
      Sets up the core javascript player in the given context

ios/core/Sources/Types/Core/ConstantsController.swift

@@ -0,0 +1,31 @@
+import JavaScriptCore
+
+public class ConstantsController {
+    var constantsController: JSValue?
+
+    public func getConstants<T>(key: Any, namespace: String, fallback: Any? = nil) -> T? {
+        if let fallbackValue = fallback {
+            let value = self.constantsController?.invokeMethod("getConstants", withArguments: [key, namespace, fallbackValue])
+            return value?.toString() as? T
+        } else {
+            let value = self.constantsController?.invokeMethod("getConstants", withArguments: [key, namespace])
+            return value?.toString() as? T
+        }
+    }
+
+    public func addConstants(data: Any, namespace: String) -> Void {
+        self.constantsController?.invokeMethod("addConstants", withArguments: [data, namespace])
+    }
+
+    public func setTemporaryValues(data: Any, namespace: String) -> Void {
+        self.constantsController?.invokeMethod("setTemporaryValues", withArguments: [data, namespace])
+    }
+
+    public func clearTemporaryValues() -> Void {
+        self.constantsController?.invokeMethod("clearTemporaryValues", withArguments: [])
+    }
+
+    public init(constantsController: JSValue) {
+        self.constantsController = constantsController
+    }
+}

ios/core/Tests/HeadlessPlayerTests.swift

@@ -272,6 +272,101 @@ class HeadlessPlayerTests: XCTestCase {
         player.start(flow: FlowData.COUNTER) { _ in}
         wait(for: [updateExp], timeout: 1)
     }
+
+    func testConstantsController() {
+        let player = HeadlessPlayerImpl(plugins: [])
+
+        guard let constantsController = player.constantsController else { return }
+
+        // Basic get/set tests
+        let data: Any = [
+            "firstname": "john",
+            "lastname": "doe",
+            "favorite": [
+                "color": "red"
+            ]
+        ]
+
+        constantsController.addConstants(data: data, namespace: "constants")
+
+        let firstname: String? = constantsController.getConstants(key: "firstname", namespace: "constants")
+        XCTAssertEqual(firstname, "john")
+
+        let middleName: String? = constantsController.getConstants(key:"middlename", namespace: "constants")
+        XCTAssertEqual(middleName, "undefined")
+
+        let middleNameSafe: String? = constantsController.getConstants(key:"middlename", namespace: "constants", fallback: "A")
+        XCTAssertEqual(middleNameSafe, "A")
+
+        let favoriteColor: String? = constantsController.getConstants(key:"favorite.color", namespace: "constants")
+        XCTAssertEqual(favoriteColor, "red")
+
+        let nonExistantNamespace: String? = constantsController.getConstants(key:"test", namespace: "foo")
+        XCTAssertEqual(nonExistantNamespace, "undefined")
+
+        let nonExistantNamespaceWithFallback: String? = constantsController.getConstants(key:"test", namespace: "foo", fallback: "B")
+        XCTAssertEqual(nonExistantNamespaceWithFallback, "B")
+
+        // Test and make sure keys override properly
+        let newData: Any = [
+           "favorite": [
+             "color": "blue",
+           ],
+        ];
+
+        constantsController.addConstants(data: newData, namespace: "constants");
+
+        let newFavoriteColor: String? = constantsController.getConstants(key: "favorite.color", namespace:"constants")
+        XCTAssertEqual(newFavoriteColor, "blue")
+    }
+
+    func testConstantsControllerTempValues() {
+        let player = HeadlessPlayerImpl(plugins: [])
+
+        guard let constantsController = player.constantsController else { return }
+
+        // Add initial constants
+        let data: Any = [
+            "firstname": "john",
+            "lastname": "doe",
+            "favorite": [
+                "color": "red"
+            ]
+        ]
+        constantsController.addConstants(data: data, namespace: "constants")
+
+        // Override with temporary values
+        let tempData: Any = [
+            "firstname": "jane",
+            "favorite": [
+                "color": "blue"
+            ]
+        ]
+        constantsController.setTemporaryValues(data:tempData, namespace: "constants")
+
+        // Test temporary override
+        let firstnameTemp: String? = constantsController.getConstants(key:"firstname", namespace: "constants")
+        XCTAssertEqual(firstnameTemp, "jane")
+
+        let favoriteColorTemp: String? = constantsController.getConstants(key: "favorite.color", namespace: "constants")
+        XCTAssertEqual(favoriteColorTemp, "blue")
+
+        // Test fallback to original values when temporary values are not present
+        let lastnameTemp: String? = constantsController.getConstants(key: "lastname", namespace: "constants")
+        XCTAssertEqual(lastnameTemp, "doe")
+
+        // Reset temp and values should be the same as the original data
+        constantsController.clearTemporaryValues();
+
+        let firstname: String? = constantsController.getConstants(key:"firstname", namespace: "constants")
+        XCTAssertEqual(firstname, "john")
+
+        let favoriteColor: String? = constantsController.getConstants(key: "favorite.color", namespace: "constants")
+        XCTAssertEqual(favoriteColor, "red")
+
+        let lastname: String? = constantsController.getConstants(key: "lastname", namespace: "constants")
+        XCTAssertEqual(lastname, "doe")
+    }
 }
 
 class FakePlugin: JSBasePlugin, NativePlugin {

ios/swiftui/Sources/SwiftUIPlayer.swift

@@ -199,6 +199,7 @@ public struct SwiftUIPlayer: View, HeadlessPlayer {
     public var body: some View {
         bodyContent
             .environment(\.inProgressState, (state as? InProgressState))
+            .environment(\.constantsController, constantsController)
             // forward results from our Context along to our result binding
             .onReceive(context.$result.debounce(for: 0.1, scheduler: RunLoop.main)) {
                 self.result = $0
@@ -232,12 +233,23 @@ struct InProgressStateKey: EnvironmentKey {
     static var defaultValue: InProgressState?
 }
 
+/// EnvironmentKey for storing `constantsController`
+struct ConstantsControllerStateKey: EnvironmentKey {
+    /// The default value for `@Environment(\.constantsController)`
+    static var defaultValue: ConstantsController? = nil
+}
+
 public extension EnvironmentValues {
     /// The `InProgressState` of Player if it is in progress, and in scope
     var inProgressState: InProgressState? {
         get { self[InProgressStateKey.self] }
         set { self[InProgressStateKey.self] = newValue }
     }
+
+    var constantsController: ConstantsController? {
+        get { self[ConstantsControllerStateKey.self] }
+        set { self[ConstantsControllerStateKey.self] = newValue }
+    }
 }
 
 internal extension SwiftUIPlayer {