Fix: introduces the verification of the python installation (#1730)

* Fix: introduces the verification of the python installation

* Update ExtractImageScansController.java

* Update CheckProgramInstall.java

src/main/java/stirling/software/SPDF/controller/api/converters/ConvertImgPDFController.java

@@ -7,7 +7,6 @@ import java.net.URLConnection;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
@@ -17,7 +16,6 @@ import org.apache.commons.io.FileUtils;
 import org.apache.pdfbox.rendering.ImageType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ModelAttribute;
@@ -32,6 +30,7 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.api.converters.ConvertToImageRequest;
 import stirling.software.SPDF.model.api.converters.ConvertToPdfRequest;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 import stirling.software.SPDF.utils.PdfUtils;
 import stirling.software.SPDF.utils.ProcessExecutor;
 import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
@@ -82,7 +81,10 @@ public class ConvertImgPDFController {
         if (result == null || result.length == 0) {
             logger.error("resultant bytes for {} is null, error converting ", filename);
         }
-        if (imageFormat.equalsIgnoreCase("webp")) {
+        if (imageFormat.equalsIgnoreCase("webp") && !CheckProgramInstall.isPythonAvailable()) {
+            throw new IOException("Python is not installed. Required for WebP conversion.");
+        } else if (imageFormat.equalsIgnoreCase("webp")
+                && CheckProgramInstall.isPythonAvailable()) {
             // Write the output stream to a temp file
             Path tempFile = Files.createTempFile("temp_png", ".png");
             try (FileOutputStream fos = new FileOutputStream(tempFile.toFile())) {
@@ -90,21 +92,13 @@ public class ConvertImgPDFController {
                 fos.flush();
             }
 
-            String pythonVersion = "python3";
-            try {
-                ProcessExecutor.getInstance(ProcessExecutor.Processes.PYTHON_OPENCV)
-                        .runCommandWithOutputHandling(Arrays.asList("python3", "--version"));
-            } catch (IOException e) {
-                ProcessExecutor.getInstance(ProcessExecutor.Processes.PYTHON_OPENCV)
-                        .runCommandWithOutputHandling(Arrays.asList("python", "--version"));
-                pythonVersion = "python";
-            }
+            String pythonVersion = CheckProgramInstall.getAvailablePythonCommand();
 
             List<String> command = new ArrayList<>();
             command.add(pythonVersion);
             command.add("./scripts/png_to_webp.py"); // Python script to handle the conversion
 
-                // Create a temporary directory for the output WebP files
+            // Create a temporary directory for the output WebP files
             Path tempOutputDir = Files.createTempDirectory("webp_output");
             if (singleImage) {
                 // Run the Python script to convert PNG to WebP

src/main/java/stirling/software/SPDF/controller/api/misc/ExtractImageScansController.java

@@ -32,6 +32,7 @@ import io.swagger.v3.oas.annotations.parameters.RequestBody;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.api.misc.ExtractImageScansRequest;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 import stirling.software.SPDF.utils.ProcessExecutor;
 import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
 import stirling.software.SPDF.utils.WebResponseUtils;
@@ -76,6 +77,11 @@ public class ExtractImageScansController {
         Path tempZipFile = null;
         List<Path> tempDirs = new ArrayList<>();
 
+        if (!CheckProgramInstall.isPythonAvailable()) {
+            throw new IOException("Python is not installed.");
+        }
+
+        String pythonVersion = CheckProgramInstall.getAvailablePythonCommand();
         try {
             // Check if input file is a PDF
             if ("pdf".equalsIgnoreCase(extension)) {
@@ -117,7 +123,7 @@ public class ExtractImageScansController {
                 List<String> command =
                         new ArrayList<>(
                                 Arrays.asList(
-                                        "python3",
+                                        pythonVersion,
                                         "./scripts/split_photos.py",
                                         images.get(i),
                                         tempDir.toString(),

src/main/java/stirling/software/SPDF/controller/api/misc/ExtractImagesController.java

@@ -140,9 +140,9 @@ public class ExtractImagesController {
             Set<Integer> processedImages,
             ZipOutputStream zos)
             throws IOException {
-        if(page.getResources() == null || page.getResources().getXObjectNames() == null) {
-    		return;
-    	}
+        if (page.getResources() == null || page.getResources().getXObjectNames() == null) {
+            return;
+        }
         for (COSName name : page.getResources().getXObjectNames()) {
             if (page.getResources().isImageXObject(name)) {
                 PDImageXObject image = (PDImageXObject) page.getResources().getXObject(name);

src/main/java/stirling/software/SPDF/controller/web/ConverterWebController.java

@@ -9,6 +9,8 @@ import org.springframework.web.servlet.ModelAndView;
 import io.swagger.v3.oas.annotations.Hidden;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
+import stirling.software.SPDF.utils.CheckProgramInstall;
+
 @Controller
 @Tag(name = "Convert", description = "Convert APIs")
 public class ConverterWebController {
@@ -69,6 +71,8 @@ public class ConverterWebController {
     @GetMapping("/pdf-to-img")
     @Hidden
     public String pdfToimgForm(Model model) {
+        boolean isPython = CheckProgramInstall.isPythonAvailable();
+        model.addAttribute("isPython", isPython);
         model.addAttribute("currentPage", "pdf-to-img");
         return "convert/pdf-to-img";
     }

src/main/java/stirling/software/SPDF/controller/web/OtherWebController.java

@@ -16,6 +16,7 @@ import io.swagger.v3.oas.annotations.Hidden;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.ApplicationProperties;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 
 @Controller
 @Tag(name = "Misc", description = "Miscellaneous APIs")
@@ -34,6 +35,8 @@ public class OtherWebController {
     @Hidden
     public ModelAndView extractImageScansForm() {
         ModelAndView modelAndView = new ModelAndView("misc/extract-image-scans");
+        boolean isPython = CheckProgramInstall.isPythonAvailable();
+        modelAndView.addObject("isPython", isPython);
         modelAndView.addObject("currentPage", "extract-image-scans");
         return modelAndView;
     }