Handling images inside ZIP or with URL’s

The Open-event webapp generator now provides the user a facility to upload the speakers and sponsors images inside the ZIP as images/speakers and images/sponsors.  After that the user will just have to specify the path of the images inside JSON such as /images/speakers/photoname.jpg  instead of URL’s.

How It Works ?

Whenever a user uploads a ZIP containing different files, it is extracted in dist/ folder according to the filename inside ZIP.

//fold.js... function to extract files according to folder name

var admZip = require('adm-zip');
const distPath = __dirname + '/../../../dist';
const uploadsPath = __dirname + '/../../../uploads';
const mockPath = __dirname + '/../../../mockjson'

copyUploads: function(appFolder, uploadedFile) {
 const appPath = distPath + '/' + appFolder;
 fs.mkdirpSync(appPath + '/json');
 var zip = new admZip(uploadedFile);
 var zipEntries = zip.getEntries(); 

 zipEntries.forEach(function(zipEntry) {
 
 switch(zipEntry.entryName){
 case 'images/speakers/':
 zip.extractEntryTo("images/speakers/", appPath ); 
 break;
 case 'images/sponsors/':
 zip.extractEntryTo("images/sponsors/", appPath ); 
 break;
 case 'audio/':
 zip.extractEntryTo("audio/", appPath);
 break;
 case 'sessions':
 zip.extractEntryTo("sessions", appPath +'/json/');
 break;
 case 'speakers':
 zip.extractEntryTo("speakers", appPath +'/json/');
 break;
 case 'microlocations' :
 zip.extractEntryTo("microlocations", appPath+'/json/');
 break;
 case 'event' :
 zip.extractEntryTo("event", appPath +'/json/');
 break;
 case 'sponsors' :
 zip.extractEntryTo("sponsors", appPath +'/json/');
 break;
 case 'tracks':
 zip.extractEntryTo("tracks", appPath +'/json/');
 break;
 default:
 }

This will send all the speaker images to images/speakers in dist and all sponsors images to images/sponsors in dist ( dist is the folder served to the user).

 

const appFolder = reqOpts.email + '/' + slugify(reqOpts.name);
 speakers.forEach((speaker) => {
  if ((speaker.photo !== null) && (speaker.photo.substring(0, 4) ===     'http')) {
 speaker.photo = urlencode(distHelper.downloadSpeakerPhoto(appFolder,    speaker.photo));
 }
 else {
 var reg = speaker.photo.split('');
 if(reg[0] =='/'){
 speaker.photo =    urlencode(speaker.photo.substring(1,speaker.photo.length));
 }
 
 }

 });
//dist.js

downloadSpeakerPhoto: function(appFolder, photoUrl) {
 const appPath = distPath + '/' +appFolder;
 const photoFileName = photoUrl.split('/').pop();
 const photoFilePath = 'images/speakers/' + photoFileName;

 console.log('Downloading photo : ' + photoFileName);
 downloadFile(photoUrl, appPath + '/' + photoFilePath);
 return photoFilePath;
 },

The code above shows how the image URL’s are split on the basis of ‘/’ to get the last element of the URL that is photoFileName. After that the image can be written inside the folder.

images/speakers/' + photoFileName

This code also handles the case when the images are downloaded by taking URL paths from JSON. If the photo in JSON has a string matched with ‘HTTP’ .Then it is downloaded in images/speakers/ . Finally, the image is downloaded with the same path as specified in JSON which can then be easily related in HTML image tag.

//dist.js Function to download files

const downloadFile = function(url, filePath) {
 const fileStream = fs.createWriteStream(filePath);

 fileStream.on('error', function(err) {
 console.log(err);
 });
 try {
 request(url).pipe(fileStream);
 } catch (err) {
 console.log(err);
 }
};

That’s how the images inside the ZIP and the image URL’s inside JSON files are handled in Open-event webapp generator.

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