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WIP: Fixes issue - needs refactor
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@DKaitantzidis
DKaitantzidis committed Dec 25, 2023
1 parent 9652f59 commit fb18d0d
Showing 1 changed file with 78 additions and 69 deletions.
147 changes: 78 additions & 69 deletions src/main/java/stirling/software/SPDF/controller/api/MergeController.java
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Original file line number Diff line number Diff line change
@@ -1,7 +1,6 @@
package stirling.software.SPDF.controller.api;

import java.io.IOException;
import java.io.InputStream;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.attribute.BasicFileAttributes;
Expand All @@ -10,10 +9,15 @@
import java.util.Comparator;
import java.util.List;

import org.apache.pdfbox.io.MemoryUsageSetting;
import org.apache.pdfbox.multipdf.PDFMergerUtility;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
Expand All @@ -34,82 +38,87 @@ public class MergeController {
private static final Logger logger = LoggerFactory.getLogger(MergeController.class);


private PDDocument mergeDocuments(List<PDDocument> documents) throws IOException {
PDDocument mergedDoc = new PDDocument();
for (PDDocument doc : documents) {
for (PDPage page : doc.getPages()) {
mergedDoc.addPage(page);
private PDDocument mergeDocuments(List<PDDocument> documents) throws IOException {
PDDocument mergedDoc = new PDDocument();
for (PDDocument doc : documents) {
for (PDPage page : doc.getPages()) {
mergedDoc.addPage(page);
}
}
return mergedDoc;
}
return mergedDoc;
}

private Comparator<MultipartFile> getSortComparator(String sortType) {
switch (sortType) {
case "byFileName":
return Comparator.comparing(MultipartFile::getOriginalFilename);
case "byDateModified":
return (file1, file2) -> {
try {
BasicFileAttributes attr1 = Files.readAttributes(Paths.get(file1.getOriginalFilename()), BasicFileAttributes.class);
BasicFileAttributes attr2 = Files.readAttributes(Paths.get(file2.getOriginalFilename()), BasicFileAttributes.class);
return attr1.lastModifiedTime().compareTo(attr2.lastModifiedTime());
} catch (IOException e) {
return 0; // If there's an error, treat them as equal
}
};
case "byDateCreated":
return (file1, file2) -> {
try {
BasicFileAttributes attr1 = Files.readAttributes(Paths.get(file1.getOriginalFilename()), BasicFileAttributes.class);
BasicFileAttributes attr2 = Files.readAttributes(Paths.get(file2.getOriginalFilename()), BasicFileAttributes.class);
return attr1.creationTime().compareTo(attr2.creationTime());
} catch (IOException e) {
return 0; // If there's an error, treat them as equal
}
};
case "byPDFTitle":
return (file1, file2) -> {
try (PDDocument doc1 = PDDocument.load(file1.getInputStream());
PDDocument doc2 = PDDocument.load(file2.getInputStream())) {
String title1 = doc1.getDocumentInformation().getTitle();
String title2 = doc2.getDocumentInformation().getTitle();
return title1.compareTo(title2);
} catch (IOException e) {
return 0;
}
};
case "orderProvided":
default:
return (file1, file2) -> 0; // Default is the order provided
private Comparator<MultipartFile> getSortComparator(String sortType) {
switch (sortType) {
case "byFileName":
return Comparator.comparing(MultipartFile::getOriginalFilename);
case "byDateModified":
return (file1, file2) -> {
try {
BasicFileAttributes attr1 = Files.readAttributes(Paths.get(file1.getOriginalFilename()), BasicFileAttributes.class);
BasicFileAttributes attr2 = Files.readAttributes(Paths.get(file2.getOriginalFilename()), BasicFileAttributes.class);
return attr1.lastModifiedTime().compareTo(attr2.lastModifiedTime());
} catch (IOException e) {
return 0; // If there's an error, treat them as equal
}
};
case "byDateCreated":
return (file1, file2) -> {
try {
BasicFileAttributes attr1 = Files.readAttributes(Paths.get(file1.getOriginalFilename()), BasicFileAttributes.class);
BasicFileAttributes attr2 = Files.readAttributes(Paths.get(file2.getOriginalFilename()), BasicFileAttributes.class);
return attr1.creationTime().compareTo(attr2.creationTime());
} catch (IOException e) {
return 0; // If there's an error, treat them as equal
}
};
case "byPDFTitle":
return (file1, file2) -> {
try (PDDocument doc1 = PDDocument.load(file1.getInputStream());
PDDocument doc2 = PDDocument.load(file2.getInputStream())) {
String title1 = doc1.getDocumentInformation().getTitle();
String title2 = doc2.getDocumentInformation().getTitle();
return title1.compareTo(title2);
} catch (IOException e) {
return 0;
}
};
case "orderProvided":
default:
return (file1, file2) -> 0; // Default is the order provided
}
}
}

@PostMapping(consumes = "multipart/form-data", value = "/merge-pdfs")
@Operation(summary = "Merge multiple PDF files into one",
description = "This endpoint merges multiple PDF files into a single PDF file. The merged file will contain all pages from the input files in the order they were provided. Input:PDF Output:PDF Type:MISO")
public ResponseEntity<byte[]> mergePdfs(@ModelAttribute MergePdfsRequest form) throws IOException {
@PostMapping(consumes = "multipart/form-data", value = "/merge-pdfs")
@Operation(summary = "Merge multiple PDF files into one",
description = "This endpoint merges multiple PDF files into a single PDF file. The merged file will contain all pages from the input files in the order they were provided. Input:PDF Output:PDF Type:MISO")
public ResponseEntity<byte[]> mergePdfs(@ModelAttribute MergePdfsRequest form) throws IOException {

MultipartFile[] files = form.getFileInput();
Arrays.sort(files, getSortComparator(form.getSortType()));
try {
MultipartFile[] files = form.getFileInput();
Arrays.sort(files, getSortComparator(form.getSortType()));

List<PDDocument> documents = new ArrayList<>();
for (MultipartFile file : files) {
try (InputStream is = file.getInputStream()) {
documents.add(PDDocument.load(is));
}
}
PDFMergerUtility mergedDoc = new PDFMergerUtility();
ByteArrayOutputStream docOutputstream = new ByteArrayOutputStream();

try (PDDocument mergedDoc = mergeDocuments(documents)) {
ResponseEntity<byte[]> response = WebResponseUtils.pdfDocToWebResponse(mergedDoc, files[0].getOriginalFilename().replaceFirst("[.][^.]+$", "") + "_merged.pdf");
return response;
} finally {
for (PDDocument doc : documents) {
if (doc != null) {
doc.close();
for (MultipartFile file : files) {
mergedDoc.addSource(new ByteArrayInputStream(file.getBytes()));
}

mergedDoc.setDestinationFileName(files[0].getOriginalFilename().replaceFirst("[.][^.]+$", ""));
mergedDoc.setDestinationStream(docOutputstream);
mergedDoc.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_PDF);

// Here you have to set the actual filename of your pdf
headers.setContentDispositionFormData(mergedDoc.getDestinationFileName(), mergedDoc.getDestinationFileName());
headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
return new ResponseEntity<>(docOutputstream.toByteArray(), headers, HttpStatus.OK);
} catch (Exception ex) {
logger.error("Error in merge pdf process", ex);
throw ex;
}
}
}

}

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