Avoid loading available extensions list if it seems too small

(cherry picked from commit 6a39c8fc13821a3b6d8f0efd738254154f4b7148)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

app/src/main/java/eu/kanade/tachiyomi/extension/ExtensionManager.kt

@@ -17,6 +17,7 @@ import eu.kanade.tachiyomi.extension.util.ExtensionLoader
 import eu.kanade.tachiyomi.source.Source
 import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.util.lang.launchNow
+import eu.kanade.tachiyomi.util.system.logcat
 import eu.kanade.tachiyomi.util.system.toast
 import exh.log.xLogD
 import exh.source.BlacklistedSources
@@ -24,6 +25,7 @@ import exh.source.EH_SOURCE_ID
 import exh.source.EXH_SOURCE_ID
 import exh.source.MERGED_SOURCE_ID
 import kotlinx.coroutines.async
+import logcat.LogPriority
 import rx.Observable
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
@@ -198,7 +200,8 @@ class ExtensionManager(
             val extensions: List<Extension.Available> = try {
                 api.findExtensions()
             } catch (e: Exception) {
-                context.toast(e.message)
+                logcat(LogPriority.ERROR, e)
+                context.toast(R.string.extension_api_error)
                 emptyList()
             }
 

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionGithubApi.kt

@@ -23,20 +23,30 @@ internal class ExtensionGithubApi {
 
     suspend fun findExtensions(): List<Extension.Available> {
         return withIOContext {
-            networkService.client
+            val extensions = networkService.client
                 .newCall(GET("${REPO_URL_PREFIX}index.min.json"))
                 .await()
                 .parseAs<List<ExtensionJsonObject>>()
-                .toExtensions()
-        } /* SY --> */ + preferences.extensionRepos().get().flatMap { repoPath ->
-            val url = "$BASE_URL$repoPath/repo/"
-            networkService.client
-                .newCall(GET("${url}index.min.json"))
-                .await()
-                .parseAs<List<ExtensionJsonObject>>()
-                .toExtensions(url)
+                .toExtensions() /* SY --> */ + preferences.extensionRepos()
+                    .get()
+                    .flatMap { repoPath ->
+			            val url = "$BASE_URL$repoPath/repo/"
+			            networkService.client
+			                .newCall(GET("${url}index.min.json"))
+			                .await()
+			                .parseAs<List<ExtensionJsonObject>>()
+			                .toExtensions(url)
+			        }
+			        // SY <--
+
+            // Sanity check - a small number of extensions probably means something broke
+            // with the repo generator
+            if (extensions.size < 100) {
+                throw Exception()
+            }
+
+            extensions
         }
-        // SY <--
     }
 
     suspend fun checkForUpdates(context: Context): List<Extension.Installed> {

app/src/main/res/values/strings.xml

@@ -261,6 +261,7 @@
     <string name="untrusted_extension_message">This extension was signed with an untrusted certificate and wasn\'t activated.\n\nA malicious extension could read any login credentials stored in Tachiyomi or execute arbitrary code.\n\nBy trusting this certificate you accept these risks.</string>
     <string name="obsolete_extension_message">This extension is no longer available.</string>
     <string name="unofficial_extension_message">This extension is not from the official Tachiyomi extensions list.</string>
+    <string name="extension_api_error">Failed to get extensions list</string>
     <string name="ext_version_info">Version: %1$s</string>
     <string name="ext_language_info">Language: %1$s</string>
     <string name="ext_nsfw_short">18+</string>