I'm building a fairly basic webpage using express. However, I'm having some trouble with my image pathways.
This code works fine.
app.use(express.static(path.join(__dirname, "/app/public/")));
app.get("/overview", function(req, res) {
res.render('some-file');
});
Inside of some-file.ejs I have...
<img src="assets/images/picture.jpg">
But what doesnt work is when I have a second url pathway.
app.get("/overview/specific", function(req, res) {
res.render('another-file');
});
<img src="assets/images/picture.jpg">
In this example I'm trying to load the exact same image (in my case its a banner thats reused on every single page). This gives me an error that the image is not found. What I've noticed from the console errors is that the image is being loaded from localhost:3000/overview/assets/images/picture.jpg
I don't understand why express is trying to load the image from whatever the first pathway is (overview in this case). Overview shouldnt be in the pathway!
Can anyone help me out debugging this issue?
Thanks in advance
Try to use /assets/images/picture.jpg.
Add / before the path. Then it will take /app/public/ as a root and be sure that the image will be at :
/app/public/assets/images/picture.jpg
Now wherever you want picture.jpg just pass this absolute path.
We serve favicons dynamically using an ExpressJS redirect, it works very well.
First, we retrieve the site object from memory with a quick lookup based on req.hostname, then send this response:
res.redirect(site.favicon);
The favicon variable could be a static asset on our server, or an asset on another server too. Our front-end code just calls /api/resources/favicon and it will receive the correct link in return.
Related
I am new in Angular
What I am going to try is to get the HTML of a page and reproduce it into an iFrame (it is an exercise).
I am using the following piece of code:
var prova = this._http.get(myUrl, {responseType: "text"}).subscribe((x) =>{
console.log(x);
});
I did it on a website (if is needed I can also insert the name of the pages) and it returns the html only of some pages.
In the other case the string x is empty.
Could it depend on connection?
Or there is some way to wait the end of the get request?
Or simply is wrong my approach and I should make a different type of request?
Your most likely going to need to use a library like puppeteer if you want to render a page properly. Puppeteer is a node library and useless headless chrome so I am not sure how well you could really integrate with Angular.
https://github.com/GoogleChrome/puppeteer
I'm trying to send a hyperlink (such as: "http://google.com") as a parameter to my Express server script. My current script looks like this:
var app = require("express")();
app.get("/new/:link(*)", function(req, res){
var link = req.params.link;
res.end(JSON.stringify({
site: link
}));
});
app.listen(process.env.PORT || 3000, function(){
console.log("Listening...");
});
This is just a test to see if I can get it working so I can build something bigger on top. The idea is that I can send a link and receive the link in JSON. However when I try to go to the site with the the link as parameter, my browser want to save a file called "google.com" and it doesn't receive any JSON from the server.
I know it's possible to do this without changing anything about my browser but I don't know how. Anyone has any ideas?
Ok, so I have accidentally fixed my problem.
Apparently i had to write "res.send(...)" instead of "end". It now works perfectly although I don't really understand why.
We want to develop a widget to upload images to containers. This is a very well documented task:
1.- Object Storage Tutorial
2.- Fireware-Wiki
3.- OpenStack Object Storage Docs (Swift)
With all this you can manage to get (download), upload, delete files in a container. This is relatively clear.
On the other hand, we want to develop another widget to display images stored in a container. I think in something like this to show them:
<img src="public_object_url"/>
But I do not know how to do that. Where I get this public URL? Is there a public URL? Is it get in some step during the uploading process?
I am a bit lost how to do that. Any help would be highly appreciated.
Thanks in advance.
EDIT 1
We get blocked displaying images once they are downloaded.
A look inside "img" tags shows this:
what is the string returned by URL.createObjectURL(). If we look inside this link, the browser displays this:
We have decoded the string coming in the property "value" and the image is there!
To get the image from the object storage server we used a very similar code that the one used in the operator Álvaro recommended.
objectstorage.getFile( containerName,
reports[i].urlImagen,{
token: token,
onSuccess: onGetFileSuccess.bind(null, i),
onFailure: onGetFileFailure
});
function onGetFileSuccess(index, picture){
downloadedPicsCont--;
reports[index].urlImagen = URL.createObjectURL(picture);
if(!(downloadedPicsCont > 0)){
MashupPlatform.wiring.pushEvent('reports_output', JSON.stringify(reports));
}
}
The picture variable has the following structure, which seems to be ok too.
What is it happening?
EDIT 2
Finally, we found the reason. We were downloading images that were created directly from the cloud and not with objectStorageAPI. In you upload images from the cloud, when you download them you get them inside cdmi objects so the URL.createObjectURL doesn't not work as expected. In the other hand, if you upload them using objectStorageAPI, when downloading them, they come in raw format, so the method works correctly.
As far as I know, FIWARE Object Storage needs authentication, so there are no such public URL. But... you can download the image using your credentials and then use the URL.createObjectURL method for getting an URL usable in the src attribute of the img element.
It's a bit old, but you can use this operator as reference.
Having a tough time doing a simple web site in EJS.
I have this set up in my server file:
//Use the .html extension instead of having to name the views as *.ejs
server.engine('.html', require('ejs').__express);
// This avoids having to provide the extension to res.render()
server.set('view engine', 'html');
//set up directory to serve css and javascript files
server.use(Express.static(__dirname, '/views'));
This works great. I have HTML files, I have graphics, I have CSS. I am serving it up with a simple controller that renders the page. Nothing dynamic in these pages. But I do want them protected with an id/password system, and only served up through Express.
The access works fine, I have an end point set up to serve them. I'm forcing log in in that end point. But the problem is, that if someone knows the actual path to those files, they can get at them. So, the access is localhost:8081/admin/documentation/. However, the files are at /views/app_documents. And by entering in localhost:8081/views/app_documents/file_name.html, they can download/view the content, without going through my controls. I moved the content out of views, and grab it in my code, and serve it up, but that doesn't work for images or CSS.
Any suggestions for how to get around this?
Well, the things you find out after the fact.
This:
server.use(Express.static(__dirname, '/views'));
Is very bad. It should be:
server.use(Express.static('./views'));
The way it was, you could download our code, also. So, server.js was available for download. Yikes.
Live and learn.
Still can download the content without going through my authentication, though.
In case anyone else wants to do this, took a while. There are a few problems, as you still need to be able to directly access JS libraries, images and CSS. I found my answer in enter link description here.
The following modifications to that code does the trick. UserIsAllowed checks my permissions system to see if they can access that folder. If they can, no harm, off you go. Otherwise, kill the attempt. They get ACCESS_DENIED back as a string. I can't just kill anyone not going through my code, because then the CSS and images would not work. But this functions nicely. I now am able to serve up content based on my custom permissions system, which is part of a bunch of other administration functions. I can also have multiple different areas based on the URL that are protected by different privileges.
// This function returns a middleware function. It checks to see if the user has access
var protectPath = function(regex)
{
return function(request, response, next)
{
if (!regex.test(request.url)) { return next(); }
userIsAllowed(regex,function(allowed)
{
if (allowed)
{
next(); // send the request to the next handler, which is express.static
}
else
{
response.end('ACCESS_DENIED');
}
});
function userIsAllowed(regex,callback) {
if (regex.test('documentation_website') && request.session.admin_me && _.contains(request.session.admin_me["privileges"],"view_server_documentation")) callback(true);
else callback(false);
}
};
};
server.use(protectPath(/^\/documentation_website\/.*$/));
I have an javascript setinterval which runs every 2 minutes to get latest feeds. However, this only work on the index page. The script is in a js file which I included in the main layout page of the site. What could be the cause? I know it has to do with the path, because when I check on Net tab in Firebug, the path is wrong. However, the file is included in the main layout, and every page has it(the layout).
Dont know if it will help, but my script is:
$(document).ready(function(){
setInterval(myfx, my_time);
}
myfx(){
ajax({ url: "mypage", ..)};
}
I think the path is relative to the 'folder' that the user is currently in on the site,.. which is what is causing problems. Thanks
The problem is that your URL is relative, which means the target that you're querying changes as you change pages. I.e. if you're at http://website.com/ then mypage is http://website.com/mypage, but if you're at http://website.com/help/details then mypage is at http://website.com/help/mypage, which probably doesn't exist.
The fix is to make your url absolute (start it with '/', e.g. /mypage) so that it always points to the same location.