Adding checks for subscription url

V2rayNG/app/src/main/kotlin/com/v2ray/ang/AppConfig.kt

@@ -60,8 +60,6 @@ object AppConfig {
     const val CACHE_KEYWORD_FILTER = "cache_keyword_filter"
 
     /** Protocol identifiers. */
-    const val PROTOCOL_HTTP: String = "http://"
-    const val PROTOCOL_HTTPS: String = "https://"
     const val PROTOCOL_FREEDOM: String = "freedom"
 
     /** Broadcast actions. */

V2rayNG/app/src/main/kotlin/com/v2ray/ang/ui/SubEditActivity.kt

@@ -81,10 +81,10 @@ class SubEditActivity : BaseActivity() {
             toast(R.string.sub_setting_remarks)
             return false
         }
-//        if (TextUtils.isEmpty(subItem.url)) {
-//            toast(R.string.sub_setting_url)
-//            return false
-//        }
+        if (!Utils.isValidSubUrl(subItem.url)) {
+            toast(R.string.toast_invalid_url)
+            return false
+        }
 
         MmkvManager.encodeSubscription(editSubId, subItem)
         toast(R.string.toast_success)

V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/AngConfigManager.kt

@@ -219,7 +219,7 @@ object AngConfigManager {
             var count = 0
             servers.lines()
                 .forEach { str ->
-                    if (str.startsWith(AppConfig.PROTOCOL_HTTP) || str.startsWith(AppConfig.PROTOCOL_HTTPS)) {
+                    if (Utils.isValidSubUrl(str)) {
                         count += importUrlAsSubscription(str)
                     }
                 }

V2rayNG/app/src/main/kotlin/com/v2ray/ang/util/Utils.kt

@@ -465,5 +465,17 @@ object Utils {
         // if the program gets here, no port in the range was found
         throw IOException("no free port found")
     }
+
+    fun isValidSubUrl(value: String?): Boolean {
+        try {
+            if (value.isNullOrEmpty()) return false
+            if (URLUtil.isHttpsUrl(value)) return true
+            if (URLUtil.isHttpUrl(value) && value.contains(LOOPBACK)) return true
+        } catch (e: Exception) {
+            e.printStackTrace()
+        }
+        return false
+    }
+
 }