如何从 Firebase 云函数生成 PDF 文档

问题描述

我对 firebase 云功能很陌生，我正在尝试生成并保存 PDF 文档（在本地、firebase 存储中，甚至在浏览器中，然后通过 nodemailer 发送给用户）。

以下是我迄今为止的代码，但没有创建/生成任何内容。运行该函数时，我只是在 Firebase 日志上收到“崩溃”响应：

const functions = require("firebase-functions");
const admin = require('firebase-admin');
const nodemailer = require('nodemailer');
const cors = require('cors')({origin: true});
var pdf = require('pdfmake');

var printer = new pdf();
var fs = require('fs');
var BUCKET = 'gs://mpca-19527.appspot.com'
admin.initializeApp();

exports.createWill = functions.https.onRequest((req,res) => {
    var docDeFinition = {
        pageSize: 'A4',pageMargins: [ 40,60,40,60 ],content: [
        'First paragraph','Another paragraph,this time a little bit longer to make sure,this line will be divided into at least two lines'
        ]
        };

      var pdfDoc = printer.createPdfKitDocument(docDeFinition);
      let file_name = 'facture.pdf';
      const myPdfFile = storage.bucket(BUCKET).file(file_name);
      pdfDoc.pipe(fs.createWriteStream('document.pdf'));    
      pdfDoc.end()
      
});

这只是一个测试片段，甚至可以看到 PDFmake 的工作原理，我似乎无法让它工作。可以通过 http 请求生成 pdf 并在本地存储吗？

解决方法

所以我在这里发布我的代码以防其他人需要它：

    const functions = require("firebase-functions");
const admin = require('firebase-admin');
const nodemailer = require('nodemailer');
const {Storage} = require('@google-cloud/storage');
admin.initializeApp();
const PdfPrinter = require('pdfmake/src/printer');
const BUCKET = 'INSERTLINK HERE FROM FIREBASE.appspot.com'

//手动创建新字体文件夹

const fonts = {
    Roboto: {
      normal: 'fonts/Roboto-Regular.ttf',bold: 'fonts/Roboto-Medium.ttf',bolditalics: 'fonts/Roboto-MediumItalic.ttf'
    }
  };



const printer = new PdfPrinter(fonts);
    const fs = require('fs'); 
    const storage = new Storage({
        projectId: 'INSERT YOUR PROJECT ID' });
        const cors = require('cors')({origin: true});

    let transporter = nodemailer.createTransport({
        service: 'gmail',auth: {
            user: '[e-mail]',pass: 'INSERT PASSWORD'
        }
    });

exports.createWill = functions.https.onRequest((req,res) => {
    
var docDefinition = {
    content: [
        'First paragraph','Another paragraph,this time a little bit longer to make sure,this line will be divided into at least two lines',]
};

      var pdfDoc = printer.createPdfKitDocument(docDefinition);   
      let file_name = 'facture.pdf';
    const myPdfFile = storage.bucket(BUCKET).file(file_name);
    pdfDoc.pipe(myPdfFile.createWriteStream())
    .on('finish',function (){
      cors(req,res,() => {
        // getting dest email by query string
        const dest = 'INSERT DESTINATION [e-mail]';
        const mailOptions = {
            from: 'NAME <MY [e-mail]>',to: dest,subject: 'I\'M A PICKLE!!!',html: `<p style="font-size: 16px;">Pickle Riiiiiiiiiiiiiiiick!!</p>
                <br />`,attachments: [
                    {   
                        filename: 'facture.pdf',contentType: 'application/pdf',content: myPdfFile.createReadStream()
                    }
                ]  
        };
  
        // returning result
        return transporter.sendMail(mailOptions,(erro,info) => {
            if(erro){
                return res.send(erro.toString());
            }
            return res.send('Sent');
        });
    });  
    })
    .on('error',function(err){
      console.log('Error during the wirtestream operation in the new file');
     // res.send('Error: something goes wrong ! '+ err);
    });
    
    pdfDoc.end();
});
});