feat(android-sdk): support copy text for WebView (#219)

Author: xiaoyijun

android-sdk/android/src/main/kotlin/io/logto/sdk/android/auth/logto/LogtoWebViewAuthActivity.kt

@@ -26,6 +26,10 @@ class LogtoWebViewAuthActivity : AppCompatActivity() {
         webView = WebView(this).apply {
             settings.javaScriptEnabled = true
             settings.cacheMode = WebSettings.LOAD_NO_CACHE
+
+            val polyfill = LogtoWebViewPolyfill(hostActivity = this@LogtoWebViewAuthActivity)
+            addJavascriptInterface(polyfill, LogtoWebViewPolyfill.NAME)
+
             val socialHandler = LogtoWebViewSocialHandler(
                 webView = this,
                 hostActivity = this@LogtoWebViewAuthActivity,
@@ -34,9 +38,12 @@ class LogtoWebViewAuthActivity : AppCompatActivity() {
                 socialHandler,
                 LogtoWebViewSocialHandler.NAME,
             )
+
+            val injectScript = polyfill.getInjectScript() + socialHandler.getInjectScript()
+
             webViewClient = LogtoWebViewAuthClient(
                 hostActivity = this@LogtoWebViewAuthActivity,
-                injectScript = socialHandler.getInjectSocialScript(),
+                injectScript = injectScript,
             )
         }
         webView.loadUrl(uri)

android-sdk/android/src/main/kotlin/io/logto/sdk/android/auth/logto/LogtoWebViewPolyfill.kt

@@ -0,0 +1,27 @@
+package io.logto.sdk.android.auth.logto
+
+import android.app.Activity
+import android.content.ClipData
+import android.content.ClipboardManager
+import android.content.Context
+import android.webkit.JavascriptInterface
+
+class LogtoWebViewPolyfill(private val hostActivity: Activity) {
+    companion object {
+        const val NAME = "Polyfill"
+    }
+
+    fun getInjectScript() = """
+        window.addEventListener("load", () => {
+            window.navigator.clipboard = {
+                writeText: (text) => window.$NAME.writeText(text),
+            };
+        });
+    """.trimIndent()
+
+    @JavascriptInterface
+    fun writeText(text: String) {
+        val clipboard = hostActivity.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+        clipboard.setPrimaryClip(ClipData.newPlainText(text, text))
+    }
+}

android-sdk/android/src/main/kotlin/io/logto/sdk/android/auth/logto/LogtoWebViewSocialHandler.kt

@@ -23,7 +23,7 @@ class LogtoWebViewSocialHandler(
     }
 
     // Note: the `universal` will always be true for it is supported by the Android OS.
-    fun getInjectSocialScript() = """
+    fun getInjectScript() = """
         window.logtoNativeSdk = {
             platform: 'android',
             getPostMessage: () => (data) => window.$NAME.postMessage(JSON.stringify(data)),

android-sdk/android/src/test/kotlin/io/logto/sdk/android/auth/logto/LogtoWebViewSocialHandlerTest.kt

@@ -48,12 +48,12 @@ class LogtoWebViewSocialHandlerTest {
             SocialSessionHelper.getSupportedNativeConnectorTargets()
         } returns mutableListOf("wechat", "alipay")
 
-        val injectSocialScript = logtoWebViewSocialHandler.getInjectSocialScript()
+        val injectScript = logtoWebViewSocialHandler.getInjectScript()
         verify {
             SocialSessionHelper.getSupportedNativeConnectorTargets()
         }
 
-        assertThat(injectSocialScript)
+        assertThat(injectScript)
             .isEqualTo(
                 """
                 window.logtoNativeSdk = {