pdf generating

src/main/java/ru/ulstu/file/service/FileService.java

@@ -6,7 +6,10 @@ import org.springframework.web.multipart.MultipartFile;
 import ru.ulstu.file.model.FileData;
 import ru.ulstu.file.model.FileDataDto;
 import ru.ulstu.file.repostory.FileRepository;
+import ru.ulstu.paper.model.PaperDto;
 
+import java.io.BufferedWriter;
+import java.io.File;
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -15,6 +18,7 @@ import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.UUID;
+import java.util.stream.Collectors;
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 
@@ -119,4 +123,24 @@ public class FileService {
     public FileDataDto createFromMultipartFile(MultipartFile multipartFile) throws IOException {
         return new FileDataDto(multipartFile.getOriginalFilename(), uploadToTmpDir(multipartFile));
     }
+
+    public void createLatexAttachs(PaperDto paper) throws IOException {
+        for (FileDataDto fileDataDto : paper.getFiles().stream().filter(f -> f.isLatexAttach() && !f.isDeleted()).collect(Collectors.toList())) {
+            if (fileDataDto.getId() == null) {
+                File oldFile = getTmpFilePath(fileDataDto.getTmpFileName()).toFile();
+                File renamed = getTmpFilePath(fileDataDto.getName()).toFile();
+                oldFile.renameTo(renamed);
+            } else {
+                Files.write(getTmpFilePath(fileDataDto.getName()), fileRepository.findOne(fileDataDto.getId()).getData());
+            }
+        }
+    }
+
+    public File createLatexFile(PaperDto paper) throws IOException {
+        BufferedWriter writer = Files.newBufferedWriter(getTmpFilePath(paper.getTitle() + ".tex"));
+        writer.write(paper.getLatexText());
+        writer.close();
+
+        return getTmpFilePath(paper.getTitle() + ".tex").toFile();
+    }
 }

src/main/java/ru/ulstu/paper/controller/PaperController.java

@@ -1,5 +1,8 @@
 package ru.ulstu.paper.controller;
 
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Controller;
 import org.springframework.ui.ModelMap;
 import org.springframework.validation.Errors;
@@ -13,16 +16,19 @@ import ru.ulstu.deadline.model.Deadline;
 import ru.ulstu.paper.model.Paper;
 import ru.ulstu.paper.model.PaperDto;
 import ru.ulstu.paper.model.PaperFilterDto;
+import ru.ulstu.paper.service.LatexService;
 import ru.ulstu.paper.service.PaperService;
 import ru.ulstu.user.model.User;
 
 import javax.validation.Valid;
 import java.io.IOException;
+import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.Calendar;
 import java.util.List;
 import java.util.stream.Collectors;
 
+import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.springframework.util.StringUtils.isEmpty;
 
 
@@ -30,9 +36,11 @@ import static org.springframework.util.StringUtils.isEmpty;
 @RequestMapping(value = "/papers")
 public class PaperController {
     private final PaperService paperService;
+    private final LatexService latexService;
 
-    public PaperController(PaperService paperService) {
+    public PaperController(PaperService paperService, LatexService latexService) {
         this.paperService = paperService;
+        this.latexService = latexService;
     }
 
     @GetMapping("/papers")
@@ -109,6 +117,14 @@ public class PaperController {
         return years;
     }
 
+    @PostMapping("/generatePdf")
+    public ResponseEntity<byte[]> getPdfFile(PaperDto paper) throws IOException {
+        HttpHeaders headers = new HttpHeaders();
+        headers.add("Content-Disposition", "attachment; filename='" +
+                URLEncoder.encode(paper.getTitle() + ".pdf", UTF_8.toString()) + "'");
+        return new ResponseEntity<>(latexService.generatePdfFromLatexFile(paper), headers, HttpStatus.OK);
+    }
+
     private void filterEmptyDeadlines(PaperDto paperDto) {
         paperDto.setDeadlines(paperDto.getDeadlines().stream()
                 .filter(dto -> dto.getDate() != null || !isEmpty(dto.getDescription()))

src/main/java/ru/ulstu/paper/service/LatexService.java

@@ -0,0 +1,33 @@
+package ru.ulstu.paper.service;
+
+import de.nixosoft.jlr.JLRGenerator;
+import org.springframework.stereotype.Service;
+import ru.ulstu.file.service.FileService;
+import ru.ulstu.paper.model.PaperDto;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+@Service
+public class LatexService {
+    private FileService fileService;
+
+    public LatexService(FileService fileService) {
+        this.fileService = fileService;
+    }
+
+    public byte[] generatePdfFromLatexFile(PaperDto paper) throws IOException {
+        fileService.createLatexAttachs(paper);
+        File tex = fileService.createLatexFile(paper);
+
+        File output = new File(tex.getParentFile().getAbsolutePath() + File.separator);
+        JLRGenerator pdfGen = new JLRGenerator();
+
+        if (!pdfGen.generate(tex, output, tex.getParentFile())) {
+            throw new IOException(pdfGen.getErrorMessage());
+        }
+
+        return Files.readAllBytes(pdfGen.getPDF().toPath());
+    }
+}

src/main/resources/public/js/core.js

@@ -3,6 +3,7 @@
 
 var urlFileUpload = "/api/1.0/files/uploadTmpFile";
 var urlFileDownload = "/api/1.0/files/download/";
+var urlPdfGenerating = "/papers/generatePdf";
 var urlFileDownloadTmp = "/api/1.0/files/download-tmp/";
 
 /* exported MessageTypesEnum */

src/main/resources/templates/papers/paper.html

@@ -20,7 +20,8 @@
             <hr/>
             <div class="row">
                 <div class="col-lg-12">
-                    <form id="paper-form" method="post" th:action="@{'/papers/paper?id='+ *{id == null ? '' : id} + ''}"
+                    <form name="paperform" id="paper-form" method="post"
+                          th:action="@{'/papers/paper?id='+ *{id == null ? '' : id} + ''}"
                           th:object="${paperDto}">
                         <div class="row">
 
@@ -143,6 +144,15 @@
 
                                             </div>
                                         </div>
+                                        <div class="form-group">
+                                            <button id="pdfBtn" class="btn btn-primary text-uppercase"
+                                                    onclick="generatePDF()"
+                                                    type="button">
+                                                <i id="pdfLoadingIcon" class='fa fa-circle-o-notch fa-spin'
+                                                   style="display: none;"></i>
+                                                pdf
+                                            </button>
+                                        </div>
                                     </div>
                                 </div>
                             </div>
@@ -325,6 +335,38 @@
                 }
             }
         }
+
+        function generatePDF() {
+            $('#pdfLoadingIcon').show();
+            $('#pdfBtn').prop('disabled', true);
+            ;
+
+            var formData = new FormData(document.forms.paperform);
+            var xhr = new XMLHttpRequest();
+            xhr.open("POST", urlPdfGenerating);
+            xhr.send(formData);
+            xhr.responseType = 'blob';
+
+            xhr.onload = function () {
+                if (this.status == 200) {
+                    console.debug(this.response);
+                    var blob = new Blob([this.response], {type: 'application/pdf'});
+                    let a = document.createElement("a");
+                    a.style = "display: none";
+                    document.body.appendChild(a);
+                    let url = window.URL.createObjectURL(blob);
+                    a.href = url;
+                    a.download = $('#title').val() + '.pdf';
+                    a.click();
+                    window.URL.revokeObjectURL(url);
+                } else {
+                }
+                $('#pdfLoadingIcon').hide();
+                $('#pdfBtn').prop('disabled', false);
+                ;
+            }
+        }
+
     </script>
 </div>