Fix push gateway with some push provider (Sunup/autopush) (#5741)

* Add more HTTP response code returning NoMatrixGateway

Fix Push notifications with Mozilla's autopush that returns 406

* Update gateway resolver tests to match new known errors

Author: p1gp1g

libraries/pushproviders/unifiedpush/src/main/kotlin/io/element/android/libraries/pushproviders/unifiedpush/UnifiedPushGatewayResolver.kt

@@ -64,8 +64,9 @@ class DefaultUnifiedPushGatewayResolver(
                         UnifiedPushGatewayResolverResult.NoMatrixGateway
                     }
                 } catch (throwable: Throwable) {
-                    if ((throwable as? HttpException)?.code() == HttpURLConnection.HTTP_NOT_FOUND) {
-                        Timber.tag(loggerTag.value).i("Checking for UnifiedPush endpoint yielded 404, using fallback")
+                    val code = (throwable as? HttpException)?.code()
+                    if (code in NoMatrixGatewayResp) {
+                        Timber.tag(loggerTag.value).i("Checking for UnifiedPush endpoint yielded $code, using fallback")
                         UnifiedPushGatewayResolverResult.NoMatrixGateway
                     } else {
                         Timber.tag(loggerTag.value).e(throwable, "Error checking for UnifiedPush endpoint")
@@ -75,4 +76,14 @@ class DefaultUnifiedPushGatewayResolver(
             }
         }
     }
+
+    companion object {
+        private val NoMatrixGatewayResp = listOf<Int>(
+            HttpURLConnection.HTTP_UNAUTHORIZED,
+            HttpURLConnection.HTTP_FORBIDDEN,
+            HttpURLConnection.HTTP_NOT_FOUND,
+            HttpURLConnection.HTTP_BAD_METHOD,
+            HttpURLConnection.HTTP_NOT_ACCEPTABLE
+        )
+    }
 }

libraries/pushproviders/unifiedpush/src/test/kotlin/io/element/android/libraries/pushproviders/unifiedpush/DefaultUnifiedPushGatewayResolverTest.kt

@@ -119,7 +119,7 @@ class DefaultUnifiedPushGatewayResolverTest {
     }
 
     @Test
-    fun `when a custom url is forbidden (403), Error is returned`() = runTest {
+    fun `when a custom url is forbidden (403), NoMatrixGateway is returned`() = runTest {
         val unifiedPushApiFactory = FakeUnifiedPushApiFactory(
             discoveryResponse = {
                 throw HttpException(Response.error<Unit>(HttpURLConnection.HTTP_FORBIDDEN, "".toResponseBody()))
@@ -130,6 +130,36 @@ class DefaultUnifiedPushGatewayResolverTest {
         )
         val result = sut.getGateway("http://custom.url")
         assertThat(unifiedPushApiFactory.baseUrlParameter).isEqualTo("http://custom.url")
+        assertThat(result).isEqualTo(UnifiedPushGatewayResolverResult.NoMatrixGateway)
+    }
+
+    @Test
+    fun `when a custom url is not acceptable (406), NoMatrixGateway is returned`() = runTest {
+        val unifiedPushApiFactory = FakeUnifiedPushApiFactory(
+            discoveryResponse = {
+                throw HttpException(Response.error<Unit>(HttpURLConnection.HTTP_NOT_ACCEPTABLE, "".toResponseBody()))
+            }
+        )
+        val sut = createDefaultUnifiedPushGatewayResolver(
+            unifiedPushApiFactory = unifiedPushApiFactory
+        )
+        val result = sut.getGateway("http://custom.url")
+        assertThat(unifiedPushApiFactory.baseUrlParameter).isEqualTo("http://custom.url")
+        assertThat(result).isEqualTo(UnifiedPushGatewayResolverResult.NoMatrixGateway)
+    }
+
+    @Test
+    fun `when a custom url is internal error (500), Error is returned`() = runTest {
+        val unifiedPushApiFactory = FakeUnifiedPushApiFactory(
+            discoveryResponse = {
+                throw HttpException(Response.error<Unit>(HttpURLConnection.HTTP_INTERNAL_ERROR, "".toResponseBody()))
+            }
+        )
+        val sut = createDefaultUnifiedPushGatewayResolver(
+            unifiedPushApiFactory = unifiedPushApiFactory
+        )
+        val result = sut.getGateway("http://custom.url")
+        assertThat(unifiedPushApiFactory.baseUrlParameter).isEqualTo("http://custom.url")
         assertThat(result).isEqualTo(UnifiedPushGatewayResolverResult.Error("http://custom.url/_matrix/push/v1/notify"))
     }