Add Quad9 DOH provider (#6638)

* add quad9 as new doh provider

* add ipv6 addresses to google doh

* revert changes to import

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

@@ -12,6 +12,7 @@ import java.net.InetAddress
 const val PREF_DOH_CLOUDFLARE = 1
 const val PREF_DOH_GOOGLE = 2
 const val PREF_DOH_ADGUARD = 3
+const val PREF_DOH_QUAD9 = 4
 
 fun OkHttpClient.Builder.dohCloudflare() = dns(
     DnsOverHttps.Builder().client(build())
@@ -35,7 +36,9 @@ fun OkHttpClient.Builder.dohGoogle() = dns(
         .url("https://dns.google/dns-query".toHttpUrl())
         .bootstrapDnsHosts(
             InetAddress.getByName("8.8.4.4"),
-            InetAddress.getByName("8.8.8.8")
+            InetAddress.getByName("8.8.8.8"),
+            InetAddress.getByName("2001:4860:4860::8888"),
+            InetAddress.getByName("2001:4860:4860::8844"),
         )
         .build()
 )
@@ -52,3 +55,15 @@ fun OkHttpClient.Builder.dohAdGuard() = dns(
         )
         .build()
 )
+
+fun OkHttpClient.Builder.dohQuad9() = dns(
+    DnsOverHttps.Builder().client(build())
+        .url("https://dns.quad9.net/dns-query".toHttpUrl())
+        .bootstrapDnsHosts(
+            InetAddress.getByName("9.9.9.9"),
+            InetAddress.getByName("149.112.112.112"),
+            InetAddress.getByName("2620:fe::fe"),
+            InetAddress.getByName("2620:fe::9"),
+        )
+        .build()
+)

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

@@ -41,6 +41,7 @@ class NetworkHelper(context: Context) {
                 PREF_DOH_CLOUDFLARE -> builder.dohCloudflare()
                 PREF_DOH_GOOGLE -> builder.dohGoogle()
                 PREF_DOH_ADGUARD -> builder.dohAdGuard()
+                PREF_DOH_QUAD9 -> builder.dohAdGuard()
             }
 
             return builder

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedController.kt

@@ -18,6 +18,7 @@ import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.network.PREF_DOH_ADGUARD
 import eu.kanade.tachiyomi.network.PREF_DOH_CLOUDFLARE
 import eu.kanade.tachiyomi.network.PREF_DOH_GOOGLE
+import eu.kanade.tachiyomi.network.PREF_DOH_QUAD9
 import eu.kanade.tachiyomi.ui.base.controller.openInBrowser
 import eu.kanade.tachiyomi.ui.base.controller.withFadeTransaction
 import eu.kanade.tachiyomi.ui.setting.database.ClearDatabaseController
@@ -168,12 +169,14 @@ class SettingsAdvancedController : SettingsController() {
                     "Cloudflare",
                     "Google",
                     "AdGuard",
+                    "Quad9",
                 )
                 entryValues = arrayOf(
                     "-1",
                     PREF_DOH_CLOUDFLARE.toString(),
                     PREF_DOH_GOOGLE.toString(),
                     PREF_DOH_ADGUARD.toString(),
+                    PREF_DOH_QUAD9.toString(),
                 )
                 defaultValue = "-1"
                 summary = "%s"