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node_helper.js
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node_helper.js
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const FTPClient = require('ftp');
const Log = require('logger');
var NodeHelper = require('node_helper');
const ConcatStream = require('concat-stream');
const { Base64Encode } = require('base64-stream');
const { ExtensionAuthorized, MimeTypesAuthorized } = require('./src/constants/img-authorized');
module.exports = NodeHelper.create({
dirIndex: 0,
dirPathVisited: [], // Array<string>
dirNameList: [], // Array<{ id: number; name: string }>
imgNameList: [], // Array<{ id: number; name: string }>
imgBase64: new Object(), // { base64: string; mimeType: string }
init: function () {
Log.log('MMM-FTP-image module helper initialized.');
},
socketNotificationReceived: function (notification, payload) {
switch (notification) {
case 'FTP_IMG_CALL_LIST':
this.imgNameList = [];
if (payload.dirPathsAuthorized) {
this.dirPathsAuthorized = payload.dirPathsAuthorized;
this.connectFTPServer('list', payload);
} else {
Log.error('dirPathsAuthorized is not defined !');
}
break;
case 'FTP_IMG_CALL_BASE64':
this.imgBase64 = new Object();
this.connectFTPServer('get', payload);
break;
case 'FTP_IMG_CALL_NEXT_DIR':
this.dirIndex++;
break;
}
},
connectFTPServer: function (type, payload) {
const ftp = new FTPClient();
const self = this;
ftp.on('ready', function () {
switch (type) {
case 'list':
self.dirChangeAlgo(ftp, self, payload, type);
self.sendListName(ftp, self);
break;
case 'get':
self.dirChangeAlgo(ftp, self, payload, type);
self.sendBase64Img(ftp, self, payload);
break;
default:
throw new Error(`This type is not implemented => ${type}`);
}
});
ftp.connect({
...payload,
});
},
dirChangeAlgo: function (ftp, self, payload, type) {
let path = null;
if (self.dirIndex > 0) {
path = payload.defaultDirPath
? `${payload.defaultDirPath}/${self.dirNameList[self.dirIndex - 1].name}`
: self.dirNameList[self.dirIndex - 1].name;
if (type === 'list') {
self.dirPathVisited.push(self.dirNameList[self.dirIndex - 1].name);
}
if (
self.dirPathVisited.length === self.dirNameList.length &&
type === 'get' &&
payload.finishAllImgInCurrentDirectory
) {
self.dirIndex = -1;
self.dirPathVisited = [];
}
}
// First call and defaultDirPath is defined
else if (payload.defaultDirPath && !payload.finishAllImgInCurrentDirectory) {
path = payload.defaultDirPath;
}
// End all directory has been visited and defaultDirPath is defined => restart
else if (payload.defaultDirPath && payload.finishAllImgInCurrentDirectory) {
self.dirIndex = 0;
self.dirPathVisited = [];
path = payload.defaultDirPath;
}
if (path) {
self.moveDir(ftp, path);
}
},
moveDir: function (ftp, path) {
ftp.cwd(path, function (err) {
if (err) throw err;
});
},
sendListName: function (ftp, self) {
ftp.list(async function (err, list) {
if (err) throw err;
for (let i = 0; i < list.length; i++) {
const file = list[i];
switch (file.type) {
case '-': // File type
if (file.name.match(new RegExp(`.(${ExtensionAuthorized}?)$`, 'gm'))) {
self.imgNameList.push({
name: file.name,
id: self.imgNameList.length + 1,
});
}
break;
case 'd': // Directory type
if (
(!['.', '..'].includes(file.name) &&
(!self.dirPathsAuthorized || self.dirPathsAuthorized.length === 0)) ||
(!['.', '..'].includes(file.name) &&
self.dirPathsAuthorized &&
self.dirPathsAuthorized.includes(file.name))
) {
self.dirNameList.push({
name: file.name,
id: self.dirNameList.length + 1,
});
}
break;
}
}
ftp.end();
self.sendSocketNotification('FTP_IMG_LIST_NAME', self.imgNameList);
});
},
sendBase64Img: async function (ftp, self, payload) {
await new Promise((resolve, reject) => {
ftp.get(payload.fileName, function (err, stream) {
if (err) reject(err);
self.streamToBase64(stream, ftp)
.then(function (res) {
self.imgBase64 = {
base64: res,
mimeType: self.getMimeType(payload.fileName),
};
resolve();
})
.catch(function (err) {
throw new Error(err);
});
});
});
self.sendSocketNotification('FTP_IMG_BASE64', self.imgBase64);
},
streamToBase64: function (stream, ftp) {
return new Promise((resolve, reject) => {
const base64 = new Base64Encode();
const cbConcat = base64 => {
resolve(base64);
};
stream
.pipe(base64)
.pipe(ConcatStream(cbConcat))
.once('close', function () {
ftp.end();
})
.on('error', error => {
reject(error);
});
});
},
getMimeType: function (filename) {
for (var s in MimeTypesAuthorized) {
if (filename.indexOf(s) === 0) {
return MimeTypesAuthorized[s];
}
}
},
});