image not found / can't get /uploads/image nodejs REST API - javascript

I am trying to send an image to client in nodejs/expressjs REST API. What I am trying to do is saving that image url in mongo db database. When user make a get request, I send all the necessary data alongside the image which is basically avatar. Now on the client side I am not able to receive that image. I am keep getting below responses.
in console tab of chrome dev tools I am getting below.
When I see in the network tab I get below response which also has the link to avatar. Everything is perfect here.
Now when I check my uploads folder I do have the image. Check below:
After all this I am still getting these errors and still not sure where exactly am I making mistake. One thing is that maybe the client is trying to make a request to /uploads/image end point which I do not want. I simply want that image to be displayed using the url I am getting on response.

As we do not see the configuration of static files in express, this might be the problem.
To serve static files in your /uploads folder you need to add this line
app.use('/uploads', express.static('uploads'));

The 'uploads' directory will not be accessible from the frontend.
In node, move the uploaded file in to a subdirectory of the public directory of the node app, and set a relative path from there ans the image path.

Related

How to get file size from another site src?

So, guys, I get src's, from another site, and have the array like ["www.another.com/pic1.png", "www.another2.com/pic2.jpg"].
I tested XMLHttpRequest, and file.size, but CORS does not allow to do it.
How can I get file size, from this array items?
First of all, You must to resolve CORS problem. so you may can use a Node.js server as web crawler server to get data from another website.
Then you can use any tool which is can get detail of file to know the file size of the image.

Saving user uploaded image to folder and/or server

I have an app, that allows users to upload an image, crop it and with other data save it all as html file to be used as a footer for emails. The image is given to them as base64.
Howver turns out this is not supported by Outlook, since it doesnt accept b64 data as img source.
So my idea was to save the cropped image to a file, let's say /public/avatars/avatar.png and link it's directory as a source. However I'm having trouble finding a way how to save images to to a file using JS. My allowed stack is JS and React, no node.js.
How would I do that? I can have the file as either b64 ot canvas element, so i'm flexible here, as long as it's saved to file.
I'm open to other solutions too.
You can't save a file with client language only. You have to save it to a server, own server or external server or a service like AWS.
The best solution without server-side (strangly) is to use a API for save image and get link from this API. Then you can use this link to Outlook.
You can use https://aws.amazon.com/fr/cloudfront/ free for one year with 50Go and 2 millon request monthly.
If you do not exceed 300,000 images per year you can use this service : https://cloudinary.com/pricing
You can also use https://www.deviantart.com/developers/ but that's not really the point of service.
Weird solution :
Be careful, the login and password of your FTP user will be available in the source of your code. Minimum rights must be administered.
You can use this script for talk to FTP server from JS (not tested but seems worked) : http://www.petertorpey.com/files/ae/scripts/FTPConnection.jsx
You can try something like that :
var ftp = new FtpConnection("ftp://URL") ;
ftp.login("username", "password");
ftp.cd("FOLDER") // For move to folder
ftp.put(file,"FILE.PNG") ; // File must be a File JS Object
ftp.close() ;

Questions about extract.autodesk.io - taking a file path instead of choosing with the file chooser

I'm trying to modify the project so I could plug in a file path or a file as a variable instead of the user choosing the model file. So I'm looking for where the actual upload happens.
In submitProject():
https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/app.js#L129
I see that it just sends (with an ajax request) an object that holds the file name and unique identifier but not the actual binary file.
In here:
https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/upload-flow.js#L34
there's r.upload(), is this the actual upload of the model?
Does it start to upload the file right as you press ok in the file chooser?
Is there a way to give it a file path to upload instead of uploading with the form and file chooser?
The author of this sample should be on Christmas vacation, I just downloaded and setup the extractor sample on my machine, with a little debug into the code, let me try to answer as much as I can.
In general, I think some of your understanding is correct, but let me explain a little more:
For a local file to be uploaded and translated, there are actually 2 steps of actual “upload”.
As you mentioned, when you press ok in the file chooser, yes, the file will be first uploaded to the "extractor" server as you noticed by some methods like r.upload(), it’s actually using a JavaScript library call “flow.js", which provides multiple simultaneous, stable, fault-tolerant and resumable/restartable file uploads via the HTML5 File API. I am not expert on this, but you can check that module about how to use it to upload a file.
By now, your file is uploaded from client to the "extractor" server, but if you want to translate the file to "svf", the file is required to be uploaded to Autodesk Server(OSS), that is done by clicking “submit my project” buton, when you click this button, as you mentioned, from client, it will call the method submitProject() in https://github.com/cyrillef/extract.autodesk.io/blob/master/www/js/app.js, this method will send a post request of “/api/projects” to the "extractor" server, if you check the code at server side https://github.com/cyrillef/extract.autodesk.io/blob/master/server/projects.js , you can see the extractor server actually upload the file to Autodesk OSS, and then triggers the translation service.
This feature (passing a URL string vs a file binary) is already implemented. You can use the uri: edit box and paste your file URL there. It supports http(s) or S3 uri with access token.
The physical upload happens in this file, whereas the SubmitProject() code sends only information as JSON. The JSON object only contains a reference to the file which was uploaded using flow.js. But would contain the uri string if you had choose that method.

HTML Object data URL from dynamic source

So all uploads for my app are not stored in my web server space, they are stored in a file system storage. When my users want access to the file they call a URL and the backend process will buffer the data to the browser via the HttpServletResponse outputstream. This works great as intended for downloading a file. Now my use-case has a scenario where I need to load an embedded object using this same method.
I am essentially loading a preview of the PDF file in the browser. This works fine if the PDF is stored on the web server and I provide a direct URL to the file. But when I use my method of sending files to the user then it doesn't work.
<object data='"+pdfUrl+"' type='application/pdf' width='160px' height='160px' />
If i put pdfURL into a browser my file gets downloaded no problem. So I think the issue is the HTTP headers I am sending in the outputstream that maybe is preventing the Object from loading properly. I am not sure if maybe its expecting something specific to be set in order to trigger loading the file
I am currently using very basic headers as follows:
BufferedInputStream is = <Some File Inputstream>;
resp.setContentType(new MimetypesFileTypeMap().getContentType(directory+filename));
resp.setHeader("Content-Disposition", "attachment; filename="+StringFormatHelper.formatFileName(filename));
bufferedCopy(is, resp.getOutputStream());
is.close();
resp.getOutputStream().flush();
Anyone have any ideas on what I have to change to get the data to properly load in the Object tag? I don't get any errors in the JS console or server side. I am not sure how to debug this issue.
Edit:
SO i just realized that if i right click on where the blank Object tag is at I have the option to "Save as..." and when I do I download the PDF. So the pdf data is loaded but Its just not displaying in the UI.
The issue is this line of code
resp.setContentType(new MimetypesFileTypeMap().getContentType(directory+filename));
This was not setting the correct mime-type for the file as I thought it was. So there was a mismatch in that the Object tag was looking for application/pdf but the server was sending a different MIME type in the header. Once I matched them up everything worked.
I was able to get the correct MIME type using the Spring provided lookup instead of the JDK lookup
new ConfigurableMimeFileTypeMap().getContentType(directory+filename)

Express: Incorrect MIME type for background images

I’m having an issue with rendering background images referenced in my CSS.
The following is logged in the web inspector
Resource interpreted as Image but transferred with MIME type text/html.
The background image works fine locally - it’s only when it’s deployed to heroku that it’s not working.
I have my front-end assets in a /public dir.
app.use(express.static(path.join(__dirname, 'public’)));
I am using component to build up my frontend, so I’m referencing my built assets (CSS/JS) from public/build/ which is all working fine.
I’ve looked at express-setting-content-type-based-on-path-file? and How do I set a MIME type before sending a file in Node.js?, but have had no luck.
I’ve also looked at the res.set() api and tried to add this to my router.
// referencing my image build/background/images/my-image.png
app.get('/build/background/images/:file', function(req, res) {
res.set('Content-Type', ‘image/png’);
res.send(req.params.file);
});
The above has in fact changed the content type from ‘text/html’ to ‘image/png’, however the image does not display locally or on heroku.
The thumbnail is also broken in web inspector, yet the path to the image is correct.
In ‘Finder’ if I inspect the image - it’s says it’s kind is 'Alias'.
When you call res.send();, it's sending the literal value of whatever you pass to it. So in this case, you're sending the string 'my-image.png' to the client with Content-Type: image/png. To send the actual contents of my-image.png instead, you might look at using the res.sendfile() method.
Although I've had some great feedback from #mscdex - the issue is a result of the symlinks to background images that are created by component on heroku.

Categories