Add advanced option for DNS over HTTPS via Cloudflare (closes #3377)

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

@@ -2,14 +2,21 @@ package eu.kanade.tachiyomi.network
 
 import android.content.Context
 import eu.kanade.tachiyomi.BuildConfig
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import java.io.File
+import java.net.InetAddress
 import java.util.concurrent.TimeUnit
 import okhttp3.Cache
+import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.OkHttpClient
+import okhttp3.dnsoverhttps.DnsOverHttps
 import okhttp3.logging.HttpLoggingInterceptor
+import uy.kohesive.injekt.injectLazy
 
 class NetworkHelper(context: Context) {
 
+    private val preferences: PreferencesHelper by injectLazy()
+
     private val cacheDir = File(context.cacheDir, "network_cache")
 
     private val cacheSize = 5L * 1024 * 1024 // 5 MiB
@@ -30,6 +37,27 @@ class NetworkHelper(context: Context) {
             builder.addInterceptor(httpLoggingInterceptor)
         }
 
+        if (preferences.enableDoh()) {
+            builder.dns(
+                DnsOverHttps.Builder().client(builder.build())
+                    .url("https://cloudflare-dns.com/dns-query".toHttpUrl())
+                    .bootstrapDnsHosts(
+                        listOf(
+                            InetAddress.getByName("162.159.36.1"),
+                            InetAddress.getByName("162.159.46.1"),
+                            InetAddress.getByName("1.1.1.1"),
+                            InetAddress.getByName("1.0.0.1"),
+                            InetAddress.getByName("162.159.132.53"),
+                            InetAddress.getByName("2606:4700:4700::1111"),
+                            InetAddress.getByName("2606:4700:4700::1001"),
+                            InetAddress.getByName("2606:4700:4700::0064"),
+                            InetAddress.getByName("2606:4700:4700::6400")
+                        )
+                    )
+                    .build()
+            )
+        }
+
         builder.build()
     }