feat(core): add plugin methods getArgs and getRawArgs for iOS and Android

.changes/mobile-plugin-get-args.md

@@ -0,0 +1,6 @@
+---
+"tauri": patch:enhance
+---
+
+Added `getArgs` and `getRawArgs` methods to the plugin `Invoke` class (Kotlin and Swift),
+which lets you parse the arguments manually instead of through the `parseArgs` method.

core/tauri/mobile/android/src/main/java/app/tauri/plugin/Invoke.kt

@@ -17,6 +17,14 @@ class Invoke(
   private val argsJson: String,
   private val jsonMapper: ObjectMapper
 ) {
+  fun getRawArgs(): String {
+    return argsJson
+  }
+
+  fun getArgs(): JSObject {
+    return JSObject(argsJson)
+  }
+
   fun<T> parseArgs(cls: Class<T>): T {
     return jsonMapper.readValue(argsJson, cls)
   }

core/tauri/mobile/ios-api/Sources/Tauri/Invoke.swift

@@ -26,6 +26,17 @@ import UIKit
     self.sendChannelData = sendChannelData
   }
 
+  public func getRawArgs() -> String {
+    return self.data
+  }
+
+  public func getArgs() throws -> JSObject {
+    let jsonData = self.data.data(using: .utf8)!
+    let data = try JSONSerialization.jsonObject(with: jsonData, options: [])
+    return JSTypes.coerceDictionaryToJSObject(
+      (data as! NSDictionary), formattingDatesAsStrings: true)!
+  }
+
   public func parseArgs<T: Decodable>(_ type: T.Type) throws -> T {
     let jsonData = self.data.data(using: .utf8)!
     let decoder = JSONDecoder()

core/tauri/mobile/ios-api/Sources/Tauri/JSTypes.swift

@@ -20,3 +20,104 @@ extension Dictionary: JSValue where Key == String, Value == JSValue {}
 // convenience aliases
 public typealias JSObject = [String: JSValue]
 public typealias JSArray = [JSValue]
+
+extension Dictionary where Key == String, Value == JSValue {
+  public func getValue(_ key: String) -> JSValue? {
+    return self[key]
+  }
+
+  public func getString(_ key: String) -> String? {
+    return self[key] as? String
+  }
+
+  public func getBool(_ key: String) -> Bool? {
+    return self[key] as? Bool
+  }
+
+  public func getInt(_ key: String) -> Int? {
+    return self[key] as? Int
+  }
+
+  public func getFloat(_ key: String) -> Float? {
+    if let floatValue = self[key] as? Float {
+      return floatValue
+    } else if let doubleValue = self[key] as? Double {
+      return Float(doubleValue)
+    }
+    return nil
+  }
+
+  public func getDouble(_ key: String) -> Double? {
+    return self[key] as? Double
+  }
+
+  public func getArray(_ key: String) -> JSArray? {
+    return self[key] as? JSArray
+  }
+
+  public func getObject(_ key: String) -> JSObject? {
+    return self[key] as? JSObject
+  }
+}
+
+/*
+ Simply casting objects from foundation class clusters (such as __NSArrayM)
+ doesn't work with the JSValue protocol and will always fail. So we need to
+ recursively and explicitly convert each value in the dictionary.
+ */
+public enum JSTypes {}
+extension JSTypes {
+  public static func coerceDictionaryToJSObject(
+    _ dictionary: NSDictionary?, formattingDatesAsStrings: Bool = false
+  ) -> JSObject? {
+    return coerceToJSValue(dictionary, formattingDates: formattingDatesAsStrings) as? JSObject
+  }
+
+  public static func coerceDictionaryToJSObject(
+    _ dictionary: [AnyHashable: Any]?, formattingDatesAsStrings: Bool = false
+  ) -> JSObject? {
+    return coerceToJSValue(dictionary, formattingDates: formattingDatesAsStrings) as? JSObject
+  }
+}
+
+private let dateStringFormatter = ISO8601DateFormatter()
+
+// We need a large switch statement because we have a lot of types.
+// swiftlint:disable:next cyclomatic_complexity
+private func coerceToJSValue(_ value: Any?, formattingDates: Bool) -> JSValue? {
+  guard let value = value else {
+    return nil
+  }
+  switch value {
+  case let stringValue as String:
+    return stringValue
+  case let numberValue as NSNumber:
+    return numberValue
+  case let boolValue as Bool:
+    return boolValue
+  case let intValue as Int:
+    return intValue
+  case let floatValue as Float:
+    return floatValue
+  case let doubleValue as Double:
+    return doubleValue
+  case let dateValue as Date:
+    if formattingDates {
+      return dateStringFormatter.string(from: dateValue)
+    }
+    return dateValue
+  case let nullValue as NSNull:
+    return nullValue
+  case let arrayValue as NSArray:
+    return arrayValue.compactMap { coerceToJSValue($0, formattingDates: formattingDates) }
+  case let dictionaryValue as NSDictionary:
+    let keys = dictionaryValue.allKeys.compactMap { $0 as? String }
+    var result: JSObject = [:]
+    for key in keys {
+      result[key] = coerceToJSValue(dictionaryValue[key], formattingDates: formattingDates)
+    }
+    return result
+  default:
+    return nil
+  }
+}