Javascript 如何使用节点imap读取和保存附件
我正在使用，但我找不到一个简单的代码示例，说明如何使用fs将电子邮件中的附件保存到磁盘 我已经把文档读了好几遍了。在我看来，我应该做另一个获取，引用消息的特定部分作为附件。我从一个基本的例子开始：Javascript 如何使用节点imap读取和保存附件,javascript,node.js,base64,imap,Javascript,Node.js,Base64,Imap,我正在使用，但我找不到一个简单的代码示例，说明如何使用fs将电子邮件中的附件保存到磁盘 我已经把文档读了好几遍了。在我看来，我应该做另一个获取，引用消息的特定部分作为附件。我从一个基本的例子开始： var Imap = require('imap'), inspect = require('util').inspect; var imap = new Imap({ user: 'mygmailname@gmail.com', password: 'mygmailpassword
var Imap = require('imap'),
inspect = require('util').inspect;
var imap = new Imap({
user: 'mygmailname@gmail.com',
password: 'mygmailpassword',
host: 'imap.gmail.com',
port: 993,
tls: true
});
function openInbox(cb) {
imap.openBox('INBOX', true, cb);
}
imap.once('ready', function() {
openInbox(function(err, box) {
if (err) throw err;
var f = imap.seq.fetch('1:3', {
bodies: 'HEADER.FIELDS (FROM TO SUBJECT DATE)',
struct: true
});
f.on('message', function(msg, seqno) {
console.log('Message #%d', seqno);
var prefix = '(#' + seqno + ') ';
msg.on('body', function(stream, info) {
var buffer = '';
stream.on('data', function(chunk) {
buffer += chunk.toString('utf8');
});
stream.once('end', function() {
console.log(prefix + 'Parsed header: %s', inspect(Imap.parseHeader(buffer)));
});
});
msg.once('attributes', function(attrs) {
console.log(prefix + 'Attributes: %s', inspect(attrs, false, 8));
//Here's were I imagine to need to do another fetch for the content of the message part...
});
msg.once('end', function() {
console.log(prefix + 'Finished');
});
});
f.once('error', function(err) {
console.log('Fetch error: ' + err);
});
f.once('end', function() {
console.log('Done fetching all messages!');
imap.end();
});
});
});
imap.once('error', function(err) {
console.log(err);
});
imap.once('end', function() {
console.log('Connection ended');
});
imap.connect();
[ { partID: '2',
type: 'application',
subtype: 'octet-stream',
params: { name: 'my-file.txt' },
id: null,
description: null,
encoding: 'BASE64',
size: 44952,
md5: null,
disposition:
{ type: 'ATTACHMENT',
params: { filename: 'my-file.txt' } },
language: null } ],
如何使用node的fs模块读取该文件并将其保存到磁盘？多亏了@arnt和的帮助，我才明白了这一点。下面是一个完整的工作脚本，它将所有附件作为文件流式传输到磁盘，同时base64将动态解码它们。在内存使用方面具有很好的可扩展性
var inspect = require('util').inspect;
var fs = require('fs');
var base64 = require('base64-stream');
var Imap = require('imap');
var imap = new Imap({
user: 'mygmailname@gmail.com',
password: 'mygmailpassword',
host: 'imap.gmail.com',
port: 993,
tls: true
//,debug: function(msg){console.log('imap:', msg);}
});
function toUpper(thing) { return thing && thing.toUpperCase ? thing.toUpperCase() : thing;}
function findAttachmentParts(struct, attachments) {
attachments = attachments || [];
for (var i = 0, len = struct.length, r; i < len; ++i) {
if (Array.isArray(struct[i])) {
findAttachmentParts(struct[i], attachments);
} else {
if (struct[i].disposition && ['INLINE', 'ATTACHMENT'].indexOf(toUpper(struct[i].disposition.type)) > -1) {
attachments.push(struct[i]);
}
}
}
return attachments;
}
function buildAttMessageFunction(attachment) {
var filename = attachment.params.name;
var encoding = attachment.encoding;
return function (msg, seqno) {
var prefix = '(#' + seqno + ') ';
msg.on('body', function(stream, info) {
//Create a write stream so that we can stream the attachment to file;
console.log(prefix + 'Streaming this attachment to file', filename, info);
var writeStream = fs.createWriteStream(filename);
writeStream.on('finish', function() {
console.log(prefix + 'Done writing to file %s', filename);
});
//stream.pipe(writeStream); this would write base64 data to the file.
//so we decode during streaming using
if (toUpper(encoding) === 'BASE64') {
//the stream is base64 encoded, so here the stream is decode on the fly and piped to the write stream (file)
stream.pipe(base64.decode()).pipe(writeStream);
} else {
//here we have none or some other decoding streamed directly to the file which renders it useless probably
stream.pipe(writeStream);
}
});
msg.once('end', function() {
console.log(prefix + 'Finished attachment %s', filename);
});
};
}
imap.once('ready', function() {
imap.openBox('INBOX', true, function(err, box) {
if (err) throw err;
var f = imap.seq.fetch('1:3', {
bodies: ['HEADER.FIELDS (FROM TO SUBJECT DATE)'],
struct: true
});
f.on('message', function (msg, seqno) {
console.log('Message #%d', seqno);
var prefix = '(#' + seqno + ') ';
msg.on('body', function(stream, info) {
var buffer = '';
stream.on('data', function(chunk) {
buffer += chunk.toString('utf8');
});
stream.once('end', function() {
console.log(prefix + 'Parsed header: %s', Imap.parseHeader(buffer));
});
});
msg.once('attributes', function(attrs) {
var attachments = findAttachmentParts(attrs.struct);
console.log(prefix + 'Has attachments: %d', attachments.length);
for (var i = 0, len=attachments.length ; i < len; ++i) {
var attachment = attachments[i];
/*This is how each attachment looks like {
partID: '2',
type: 'application',
subtype: 'octet-stream',
params: { name: 'file-name.ext' },
id: null,
description: null,
encoding: 'BASE64',
size: 44952,
md5: null,
disposition: { type: 'ATTACHMENT', params: { filename: 'file-name.ext' } },
language: null
}
*/
console.log(prefix + 'Fetching attachment %s', attachment.params.name);
var f = imap.fetch(attrs.uid , { //do not use imap.seq.fetch here
bodies: [attachment.partID],
struct: true
});
//build function to process attachment message
f.on('message', buildAttMessageFunction(attachment));
}
});
msg.once('end', function() {
console.log(prefix + 'Finished email');
});
});
f.once('error', function(err) {
console.log('Fetch error: ' + err);
});
f.once('end', function() {
console.log('Done fetching all messages!');
imap.end();
});
});
});
imap.once('error', function(err) {
console.log(err);
});
imap.once('end', function() {
console.log('Connection ended');
});
imap.connect();
var-inspect=require（'util'）。inspect；
var fs=需要（'fs'）；
var base64=require（'base64-stream'）；
var Imap=require（'Imap'）；
var imap=新的imap({
用户：'mygmailname@gmail.com',
密码：“MygMail密码”，
主持人：“imap.gmail.com”，
港口：993，
tls：对
//，debug:function（msg）{console.log（'imap:'，msg）；}
});
函数toUpper（thing）{返回thing&&thing.toUpperCase？thing.toUpperCase（）：thing；}
函数findAttachmentParts（结构、附件）{
附件=附件| |[]；
对于（变量i=0，len=struct.length，r；i-1）{
附件.推送（结构[i]）；
}
}
}
归还附件；
}
函数buildAttMessageFunction（附件）{
var filename=attachment.params.name；
var编码=附件.encoding；
返回函数（消息，序号）{
变量前缀='（#'+序号+）'；
msg.on（'body'，函数（流，信息）{
//创建一个写流，这样我们就可以将附件流到文件中；
log（前缀+‘将此附件流式处理到文件’、文件名、信息）；
var writeStream=fs.createWriteStream（文件名）；
writeStream.on（'finish'，function（）{
console.log（前缀+‘已写入文件%s’，文件名）；
});
//stream.pipe（writeStream）；这会将base64数据写入文件。
//所以我们在流媒体中使用
如果（toUpper（编码）=='BASE64'）{
//流是base64编码的，因此在这里，流是动态解码的，并通过管道传输到写入流（文件）
stream.pipe（base64.decode（））.pipe（writeStream）；
}否则{
//在这里，我们没有或一些其他解码流直接到文件，这使得它可能无用
stream.pipe（writeStream）；
}
});
msg.once（'end'，function（）{
console.log（前缀+‘已完成的附件%s’，文件名）；
});
};
}
imap.once（'ready'，function（）{
imap.openBox（'INBOX'，true，函数（err，box）{
如果（错误）抛出错误；
变量f=imap.seq.fetch（'1:3'{
正文：[“HEADER.FIELDS（从主题日期到主题日期）”，
结构：对
});
f、 on（'message'，函数（msg，seqno）{
console.log（'Message#%d'，seqno）；
变量前缀='（#'+序号+）'；
msg.on（'body'，函数（流，信息）{
var缓冲区=“”；
stream.on（'data'，函数（块）{
buffer+=chunk.toString（'utf8'）；
});
stream.once（'end'，function（）{
console.log（前缀+'Parsed header:%s'，Imap.parseHeader（缓冲区））；
});
});
msg.once（'attributes'，函数（attrs）{
var attachments=findAttachmentParts（attrs.struct）；
console.log（前缀+'包含附件：%d'，附件.length）；
对于（变量i=0，len=attachments.length；i 你也可以用它来为我工作
const IMAP = require("imap");
const MailParser = require("mailparser").MailParser;
const moment = require('moment');
var fs = require('fs'), fileStream;
module.exports.imapEmailDownload = function () {
return new Promise(async (resolve, reject) => {
try {
const imapConfig = {
user: 'XXX126@gmail.com',
password: 'XXX@126',
host: 'imap.gmail.com',
port: '993',
tls: true,
tlsOptions: {
secureProtocol: 'TLSv1_method'
}
}
const imap = IMAP(imapConfig);
imap.once("ready", execute);
imap.once("error", function (err) {
console.error("Connection error: " + err.stack);
});
imap.connect();
function execute() {
imap.openBox("INBOX", false, function (err, mailBox) {
if (err) {
console.error(err);
return;
}
imap.search([["ON", moment().format('YYYY-MM-DD')]], function (err, results) {
if (!results || !results.length) { console.log("No unread mails"); imap.end(); return; }
/* mark as seen
imap.setFlags(results, ['\\Seen'], function(err) {
if (!err) {
console.log("marked as read");
} else {
console.log(JSON.stringify(err, null, 2));
}
});*/
var f = imap.fetch(results, { bodies: "" });
f.on("message", processMessage);
f.once("error", function (err) {
return Promise.reject(err);
});
f.once("end", function () {
imap.end();
});
});
});
}
function processMessage(msg, seqno) {
var parser = new MailParser({ streamAttachments: true });
parser.on("headers", function (headers) {
});
parser.on('data', data => {
if (data.type === 'text') {
console.log(seqno);
console.log(data.text); /* data.html*/
}
});
let data = ""
msg.on("body", function (stream) {
stream.on("data", function (chunk) {
data = data + chunk.toString("utf8");
parser.write(chunk.toString("utf8"));
});
stream.on("end", (chunk) => {
})
});
parser.on('attachment', async function (attachment, mail) {
let filepath = './download/';
let output = fs.createWriteStream(filepath + attachment.fileName);
attachment.stream.pipe(output).on("end", function () {
console.log("All the data in the file has been read");
}).on("close", function (err) {
console.log("Stream has been cloesd.");
});
});
msg.once("end", function () {
// console.log("Finished msg #" + seqno);
parser.end();
});
}
resolve();
} catch (error) {
console.log("error", error);
reject(error);
}
});};
您看到的partID（示例中的2）是零件号。您想发出UID FETCH 1234 BINARY.PEEK[2]（如果服务器支持二进制扩展）或BODY.PEEK[2]。BINARY.PEEK为您提供原始数据，BODY.PEEK必须根据您的编码字段进行解码。此时，RAM中有一个字符串，我希望您能找到一种方法，使用node.js将该字符串写入文件。@arnt谢谢。
imap.seq.fetchUID fetch 1234 BINAR
const IMAP = require("imap");
const MailParser = require("mailparser").MailParser;
const moment = require('moment');
var fs = require('fs'), fileStream;
module.exports.imapEmailDownload = function () {
return new Promise(async (resolve, reject) => {
try {
const imapConfig = {
user: 'XXX126@gmail.com',
password: 'XXX@126',
host: 'imap.gmail.com',
port: '993',
tls: true,
tlsOptions: {
secureProtocol: 'TLSv1_method'
}
}
const imap = IMAP(imapConfig);
imap.once("ready", execute);
imap.once("error", function (err) {
console.error("Connection error: " + err.stack);
});
imap.connect();
function execute() {
imap.openBox("INBOX", false, function (err, mailBox) {
if (err) {
console.error(err);
return;
}
imap.search([["ON", moment().format('YYYY-MM-DD')]], function (err, results) {
if (!results || !results.length) { console.log("No unread mails"); imap.end(); return; }
/* mark as seen
imap.setFlags(results, ['\\Seen'], function(err) {
if (!err) {
console.log("marked as read");
} else {
console.log(JSON.stringify(err, null, 2));
}
});*/
var f = imap.fetch(results, { bodies: "" });
f.on("message", processMessage);
f.once("error", function (err) {
return Promise.reject(err);
});
f.once("end", function () {
imap.end();
});
});
});
}
function processMessage(msg, seqno) {
var parser = new MailParser({ streamAttachments: true });
parser.on("headers", function (headers) {
});
parser.on('data', data => {
if (data.type === 'text') {
console.log(seqno);
console.log(data.text); /* data.html*/
}
});
let data = ""
msg.on("body", function (stream) {
stream.on("data", function (chunk) {
data = data + chunk.toString("utf8");
parser.write(chunk.toString("utf8"));
});
stream.on("end", (chunk) => {
})
});
parser.on('attachment', async function (attachment, mail) {
let filepath = './download/';
let output = fs.createWriteStream(filepath + attachment.fileName);
attachment.stream.pipe(output).on("end", function () {
console.log("All the data in the file has been read");
}).on("close", function (err) {
console.log("Stream has been cloesd.");
});
});
msg.once("end", function () {
// console.log("Finished msg #" + seqno);
parser.end();
});
}
resolve();
} catch (error) {
console.log("error", error);
reject(error);
}
});};