Fix proxy authentication

app/src/main/kotlin/org/koitharu/kotatsu/core/network/ProxyAuthenticator.kt

@@ -6,12 +6,24 @@ import okhttp3.Request
 import okhttp3.Response
 import okhttp3.Route
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import java.net.PasswordAuthentication
+import java.net.Proxy
 
 class ProxyAuthenticator(
 	private val settings: AppSettings,
-) : Authenticator {
+) : Authenticator, java.net.Authenticator() {
+
+	init {
+		setDefault(this)
+	}
 
 	override fun authenticate(route: Route?, response: Response): Request? {
+		if (!isProxyEnabled()) {
+			return null
+		}
+		if (response.request.header(CommonHeaders.PROXY_AUTHORIZATION) != null) {
+			return null
+		}
 		val login = settings.proxyLogin ?: return null
 		val password = settings.proxyPassword ?: return null
 		val credential = Credentials.basic(login, password)
@@ -19,4 +31,15 @@ class ProxyAuthenticator(
 			.header(CommonHeaders.PROXY_AUTHORIZATION, credential)
 			.build()
 	}
+
+	override fun getPasswordAuthentication(): PasswordAuthentication? {
+		if (!isProxyEnabled()) {
+			return null
+		}
+		val login = settings.proxyLogin ?: return null
+		val password = settings.proxyPassword ?: return null
+		return PasswordAuthentication(login, password.toCharArray())
+	}
+
+	private fun isProxyEnabled() = settings.proxyType != Proxy.Type.DIRECT
 }