rework for API, folder changes, easter eggs and fun

src/main/java/stirling/software/SPDF/controller/api/MergeController.java

@@ -0,0 +1,62 @@
+package stirling.software.SPDF.controller.api;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.PDPage;
+import org.apache.pdfbox.pdmodel.PDPageTree;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestPart;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.multipart.MultipartFile;
+
+import io.swagger.v3.oas.annotations.Hidden;
+import stirling.software.SPDF.utils.PdfUtils;
+
+@RestController
+public class MergeController {
+
+    private static final Logger logger = LoggerFactory.getLogger(MergeController.class);
+
+    private PDDocument mergeDocuments(List<PDDocument> documents) throws IOException {
+        // Create a new empty document
+        PDDocument mergedDoc = new PDDocument();
+
+        // Iterate over the list of documents and add their pages to the merged document
+        for (PDDocument doc : documents) {
+            // Get all pages from the current document
+            PDPageTree pages = doc.getPages();
+            // Iterate over the pages and add them to the merged document
+            for (PDPage page : pages) {
+                mergedDoc.addPage(page);
+            }
+        }
+
+        // Return the merged document
+        return mergedDoc;
+    }
+
+    @PostMapping(consumes = "multipart/form-data", value = "/merge-pdfs")
+    public ResponseEntity<byte[]> mergePdfs(@RequestPart(required = true, value = "fileInput") MultipartFile[] files) throws IOException {
+        // Read the input PDF files into PDDocument objects
+        List<PDDocument> documents = new ArrayList<>();
+
+        // Loop through the files array and read each file into a PDDocument
+        for (MultipartFile file : files) {
+            documents.add(PDDocument.load(file.getInputStream()));
+        }
+
+        PDDocument mergedDoc = mergeDocuments(documents);
+
+        // Return the merged PDF as a response
+        return PdfUtils.pdfDocToWebResponse(mergedDoc, files[0].getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_merged.pdf");
+    }
+
+}