Create WebViewUtil.kt

app/src/main/java/eu/kanade/tachiyomi/util/system/WebViewUtil.kt

@@ -0,0 +1,33 @@
+package eu.kanade.tachiyomi.util.system
+
+import android.webkit.WebView
+
+private val WEBVIEW_UA_VERSION_REGEX by lazy {
+    Regex(""".*Chrome/(\d+)\..*""")
+}
+
+private const val MINIMUM_WEBVIEW_VERSION = 70
+
+fun WebView.isOutdated(): Boolean {
+    return getWebviewMajorVersion(this) < MINIMUM_WEBVIEW_VERSION
+}
+
+// Based on https://stackoverflow.com/a/29218966
+private fun getWebviewMajorVersion(webview: WebView): Int {
+    val originalUA: String = webview.settings.userAgentString
+
+    // Next call to getUserAgentString() will get us the default
+    webview.settings.userAgentString = null
+
+    val uaRegexMatch = WEBVIEW_UA_VERSION_REGEX.matchEntire(webview.settings.userAgentString)
+    val webViewVersion: Int = if (uaRegexMatch != null && uaRegexMatch.groupValues.size > 1) {
+        uaRegexMatch.groupValues[1].toInt()
+    } else {
+        0
+    }
+
+    // Revert to original UA string
+    webview.settings.userAgentString = originalUA
+
+    return webViewVersion
+}