如何在Meteor中执行服务器端文件处理操作？

Question

我在服务器上使用GridFS存储Word(.docx)文件.我希望能够使用docx-builder NPM包将文档合并到一个Word文件中.

这是我上传文件的方式:

Meteor.methods({
    uploadFiles: function (files) {
      check(files, [Object]);

      if (files.length < 1)
        throw new Meteor.Error("invalid-files", "No files were uploaded");

      var documentPaths = [];

      _.each(files, function (file) {
        ActivityFiles.insert(file, function (error, fileObj) {
          if (error) {
            console.log("Could not upload file");
          } else {
            documentPaths.push("/cfs/files/activities/" + fileObj._id);
          }
        });
      });

      return documentPaths;
    }
})

我怎样才能在服务器端执行此操作？我只能做这个服务器端因为我正在使用的fs包需要无法在客户端执行的包.

这就是我目前正在努力解决这个问题的方法.从客户端,我正在调用以下方法(声明为a Meteor.method):

print: function(programId) {
  // Get the program by ID.
  var program = Programs.findOne(programId);
  // Create a new document.
  var docx = new docxbuilder.Document();
  // Go through all activities in the program.
  program.activityIds.forEach(function(activityId) {
    // Create a temporary server side folder to store activity files.
    const tempDir = fs.mkdtempSync('/tmp/');
    // Get the activity by ID.
    var activity = Activities.findOne(activityId);
    // Get the document by ID.
    var document = ActivityFiles.findOne(activity.documents.pop()._id);
    // Declare file path to where file will be read.
    const filePath = tempDir + sep + document.name();
    // Create stream to write to path.
    const fileStream = fs.createWriteStream(filePath);
    // Read from document, write to file.
    document.createReadStream().pipe(fileStream);
    // Insert into final document when finished writinf to file.
    fileStream.on('finish', () => {
      docx.insertDocxSync(filePath);
      // Delete file when operation is completed.
      fs.unlinkSync(filePath);
    });
  });
  // Save the merged document.
  docx.save('/tmp' + sep + 'output.docx', function (error) {
    if (error) {
      console.log(error);
    }
    // Insert into Collection so client can access merged document.
    Fiber = Npm.require('fibers');
    Fiber(function() {
      ProgramFiles.insert('/tmp' + sep + 'output.docx');
    }).run();
  });
}

但是,当我从ProgramFiles客户端的集合中下载最终文档时,该文档是一个空的Word文档.

这里出了什么问题？

---

我已将@ FrederickStark的答案纳入我的代码中.现在就坚持这一部分.

---

这是另一个尝试:

'click .merge-icon': (e) => {
    var programId = Router.current().url.split('/').pop();
    var programObj = Programs.findOne(programId);
    var insertedDocuments = [];
    programObj.activityIds.forEach(function(activityId) {
      var activityObj = Activities.findOne(activityId);
      var documentObj = ActivityFiles.findOne(activityObj.documents.pop()._id);
      JSZipUtils.getBinaryContent(documentObj.url(), callback);
      function callback(error, content) {
        var zip = new JSZip(content);
        var doc = new Docxtemplater().loadZip(zip);
        var xml = zip.files[doc.fileTypeConfig.textPath].asText();
        xml = xml.substring(xml.indexOf("<w:body>") + 8);
        xml = xml.substring(0, xml.indexOf("</w:body>"));
        xml = xml.substring(0, xml.indexOf("<w:sectPr"));
        insertedDocuments.push(xml);
      }
    });
    JSZipUtils.getBinaryContent('/assets/template.docx', callback);
    function callback(error, content) {
      var zip = new JSZip(content);
      var doc = new Docxtemplater().loadZip(zip);
      console.log(doc);
      setData(doc);
    }


    function setData(doc) {
      doc.setData({
        // Insert blank line between contents.
        inserted_docs_formatted: insertedDocuments.join('<w:br/><w:br/>')
        // The template file must use a `{@inserted_docs_formatted}` placeholder
        // that will be replaced by the above value.
      });

      doc.render();

      useResult(doc);
    }

    function useResult(doc) {
      var out = doc.getZip().generate({
        type: 'blob',
        mimeType: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
      });
      saveAs(out, 'output.docx');
    }

Answer 1

查看 的文档docx-builder，它仅支持从文件系统读取 docx 文件。调用的问题document.url()在于，它为您提供了一个可以通过 http 访问的 url，而不是文件系统上的路径。

因此，要使用 GridFS，您首先需要将文件写入临时文件夹，然后docx-builder才能读取它们。

import fs from 'fs';
import { sep } from 'path';
const tempDir = fs.mkdtempSync('/tmp/' + sep);

program.activityIds.forEach(function(activityId) {
  var activity = Activities.findOne(activityId);
  console.log(activity);
  var document = ActivityFiles.findOne(activity.documents.pop()._id);
  documents.push(document);

  // Build a file path in the temp folder
  const filePath = tempDir + sep + document.name();

  // Write the document to the file system using streams
  const fileStream = fs.createWriteStream(filePath);
  document.createReadStream().pipe(fileStream);

  // When the stream has finished writing the file, add it to your docx
  fileStream.on('finish', () => {
    console.log(filePath);
    docx.insertDocxSync(filePath);
    // Delete the file after you're done
    fs.unlinkSync(filePath);
  });

});

我怀疑您可以使用同步执行此操作fs.writeFileSync(filePath, document.data)，但不确定，因此没有在示例中使用它。

或者，您可以查找可以支持从流或缓冲区读取的 docx 包，然后就不需要临时文件。