Revert attempt to programmatically determine user agent string; fallback to Edge

app/src/main/java/eu/kanade/tachiyomi/network/CloudflareInterceptor.kt

@@ -9,6 +9,7 @@ import android.webkit.WebSettings
 import android.webkit.WebView
 import android.widget.Toast
 import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.util.lang.launchUI
 import eu.kanade.tachiyomi.util.system.WebViewClientCompat
 import eu.kanade.tachiyomi.util.system.WebViewUtil
@@ -98,7 +99,7 @@ class CloudflareInterceptor(private val context: Context) : Interceptor {
 
             // Avoid sending empty User-Agent, Chromium WebView will reset to default if empty
             webview.settings.userAgentString = request.header("User-Agent")
-                ?: WebViewUtil.DEFAULT_USER_AGENT
+                ?: HttpSource.DEFAULT_USER_AGENT
 
             webview.webViewClient = object : WebViewClientCompat() {
                 override fun onPageFinished(view: WebView, url: String) {

app/src/main/java/eu/kanade/tachiyomi/network/UserAgentInterceptor.kt

@@ -1,6 +1,6 @@
 package eu.kanade.tachiyomi.network
 
-import eu.kanade.tachiyomi.util.system.WebViewUtil
+import eu.kanade.tachiyomi.source.online.HttpSource
 import okhttp3.Interceptor
 import okhttp3.Response
 
@@ -12,7 +12,7 @@ class UserAgentInterceptor : Interceptor {
             val newRequest = originalRequest
                 .newBuilder()
                 .removeHeader("User-Agent")
-                .addHeader("User-Agent", WebViewUtil.DEFAULT_USER_AGENT)
+                .addHeader("User-Agent", HttpSource.DEFAULT_USER_AGENT)
                 .build()
             chain.proceed(newRequest)
         } else {

app/src/main/java/eu/kanade/tachiyomi/source/online/HttpSource.kt

@@ -10,7 +10,6 @@ import eu.kanade.tachiyomi.source.model.MangasPage
 import eu.kanade.tachiyomi.source.model.Page
 import eu.kanade.tachiyomi.source.model.SChapter
 import eu.kanade.tachiyomi.source.model.SManga
-import eu.kanade.tachiyomi.util.system.WebViewUtil
 import okhttp3.Headers
 import okhttp3.OkHttpClient
 import okhttp3.Request
@@ -75,7 +74,7 @@ abstract class HttpSource : CatalogueSource {
      * Headers builder for requests. Implementations can override this method for custom headers.
      */
     protected open fun headersBuilder() = Headers.Builder().apply {
-        add("User-Agent", WebViewUtil.DEFAULT_USER_AGENT)
+        add("User-Agent", DEFAULT_USER_AGENT)
     }
 
     /**
@@ -370,4 +369,8 @@ abstract class HttpSource : CatalogueSource {
      * Returns the list of filters for the source.
      */
     override fun getFilterList() = FilterList()
+
+    companion object {
+        const val DEFAULT_USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 Safari/537.36 Edg/88.0.705.63"
+    }
 }

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

@@ -6,13 +6,9 @@ import android.content.pm.PackageManager
 import android.webkit.CookieManager
 import android.webkit.WebSettings
 import android.webkit.WebView
-import eu.kanade.tachiyomi.util.lang.launchUI
 import timber.log.Timber
 
 object WebViewUtil {
-    var DEFAULT_USER_AGENT: String = "Mozilla/5.0 (Windows NT 10.0; Win64; x64)"
-        private set
-
     const val REQUESTED_WITH = "com.android.browser"
 
     const val MINIMUM_WEBVIEW_VERSION = 87
@@ -22,14 +18,6 @@ object WebViewUtil {
             // May throw android.webkit.WebViewFactory$MissingWebViewPackageException if WebView
             // is not installed
             CookieManager.getInstance()
-
-            launchUI {
-                DEFAULT_USER_AGENT = WebView(context)
-                    .getDefaultUserAgentString()
-                    .replace("; wv", "")
-                    .replace(" Build\\/.+?\\)".toRegex(), ")")
-                    .replace("Version/.*? ".toRegex(), "")
-            }
         } catch (e: Exception) {
             Timber.e(e)
             return false