From d716b669b978eb02f5a5dced04e861111ab94854 Mon Sep 17 00:00:00 2001
From: diallo <ibrahimasory22@hotmail.com>
Date: Thu, 8 Aug 2024 09:56:36 +0000
Subject: [PATCH] feat: Add URL  reachability check in ConvertWebsiteToPDF

---
 .../api/converters/ConvertWebsiteToPDF.java   |  6 +++
 .../software/SPDF/utils/GeneralUtils.java     | 42 +++++++++++++------
 2 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertWebsiteToPDF.java b/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertWebsiteToPDF.java
index 8bce1b226a5..026690fd654 100644
--- a/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertWebsiteToPDF.java
+++ b/src/main/java/stirling/software/SPDF/controller/api/converters/ConvertWebsiteToPDF.java
@@ -39,6 +39,12 @@ public ResponseEntity<byte[]> urlToPdf(@ModelAttribute UrlToPdfRequest request)
         if (!URL.matches("^https?://.*") || !GeneralUtils.isValidURL(URL)) {
             throw new IllegalArgumentException("Invalid URL format provided.");
         }
+
+        // validate the URL is reachable
+        if (!GeneralUtils.isURLReachable(URL)) {
+            throw new IllegalArgumentException("URL is not reachable, please provide a valid URL.");
+        }
+
         Path tempOutputFile = null;
         byte[] pdfBytes;
         try {
diff --git a/src/main/java/stirling/software/SPDF/utils/GeneralUtils.java b/src/main/java/stirling/software/SPDF/utils/GeneralUtils.java
index ae86d8c11ac..aa5f3aea9d2 100644
--- a/src/main/java/stirling/software/SPDF/utils/GeneralUtils.java
+++ b/src/main/java/stirling/software/SPDF/utils/GeneralUtils.java
@@ -13,6 +13,8 @@
 import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
 import java.util.List;
+import java.net.URL;
+import java.net.HttpURLConnection;
 
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -71,6 +73,21 @@ public static boolean isValidURL(String urlStr) {
         } catch (MalformedURLException e) {
             return false;
         }
+       
+    }   
+
+    public static boolean isURLReachable(String urlStr) {
+        try {
+            URL url = new URL(urlStr);
+            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+            connection.setRequestMethod("HEAD");
+            int responseCode = connection.getResponseCode();
+            return (200 <= responseCode && responseCode <= 399);
+        } catch (MalformedURLException e) {
+            return false;
+        } catch (IOException e) {
+            return false;
+        }
     }
 
     public static File multipartToFile(MultipartFile multipart) throws IOException {
@@ -95,19 +112,16 @@ public static Long convertSizeToBytes(String sizeStr) {
         sizeStr = sizeStr.replace(",", ".").replace(" ", "");
         try {
             if (sizeStr.endsWith("KB")) {
-                return (long)
-                        (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2)) * 1024);
+                return (long) (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2)) * 1024);
             } else if (sizeStr.endsWith("MB")) {
-                return (long)
-                        (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
-                                * 1024
-                                * 1024);
+                return (long) (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
+                        * 1024
+                        * 1024);
             } else if (sizeStr.endsWith("GB")) {
-                return (long)
-                        (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
-                                * 1024
-                                * 1024
-                                * 1024);
+                return (long) (Double.parseDouble(sizeStr.substring(0, sizeStr.length() - 2))
+                        * 1024
+                        * 1024
+                        * 1024);
             } else if (sizeStr.endsWith("B")) {
                 return Long.parseLong(sizeStr.substring(0, sizeStr.length() - 1));
             } else {
@@ -170,13 +184,15 @@ public static List<Integer> evaluateNFunc(String expression, int maxValue) {
 
         int n = 0;
         while (true) {
-            // Replace 'n' with the current value of n, correctly handling numbers before 'n'
+            // Replace 'n' with the current value of n, correctly handling numbers before
+            // 'n'
             String sanitizedExpression = insertMultiplicationBeforeN(expression, n);
             Double result = evaluator.evaluate(sanitizedExpression);
 
             // Check if the result is null or not within bounds
             if (result == null || result <= 0 || result.intValue() > maxValue) {
-                if (n != 0) break;
+                if (n != 0)
+                    break;
             } else {
                 results.add(result.intValue());
             }