I'm using s3 to allow users to download files directly from frontend a limited number of times.
Problem is I need to know if a download was successful before I update the number of download left.
Is there any way I can get any kind of control over it like s3 callback when download finished or something?
The only thing I found was Server Access Logging but after reading trough the
Best Effort Server Log Delivery section I think I need something a bit more deterministic than that.
No, this capability is not possible. It is not possible to receive a notification when an object has been accessed. The logs are the only indication of activity.
If this is a vital need, then you will need to serve the file via your own application.
Related
I have created a webapplication and set up an endpoint which returns a FileStreamResult, these can be large zip and pdf files for example. The main issue I'm facing is that if a download gets interrupted (for example the internet goes down by the client), the temporary file that is generated by the browser is immediately deleted.
I'm aware of range-requests, but to utilize them, I would have to read files from the client, to determine how much progress the download made, which is not possible from the server side and also, the same problem persists about the temporary file deletion.
So this seems like a browser limitation to me, but please correct me if I'm wrong, I would appreaciate any ideas.
I've searched a lot but couldn't find an example.
I want to use nanorframework as a webserver where I can upload and download e.g. a JSON file from the browser which holds all my settings. Is this possible?
Otherwise if I want to change some settings I have to rebuild the whole solution and uploat it.
Thanks in advance
You can use the Storage libraries to store that Json file. The actual storage can support by flash (using SPIFFs), SD card or USB mass storage device. This depends on the hardware platform that you are using. Check the Storage samples in our samples repo here.
Downloading a file is pretty straightforward you just need to serve the respective HTTP request. Check the HTTP samples in our samples repo here.
Uploading a file it's a matter of handling the POST request and grabbing the data being sent by the client browser.
I am a newbie to AWS and one of the tasks I have is to figure out how to download MSIs, ISOs stored in S3 through a web browser. I read that I could use CLI behind the scenes. So if a customer clicks on one download; the app would make a request to S3 using one of the commands and that would download the file lets say through Google Chrome or IE (Please correct me if I'm wrong in the usage of CLI).
Now if the download stops for some reason due to internet failure; is there a way to resume the download? How do I get a download done through a client.
Thanks in advance for helping. Unfortunately the AWS links gave me very little information so seeking help here!
May
Files stored in Amazon S3 can be directly accessed via web browser, just like clicking a link on any website.
If the files are marked as publicly-accessible, anyone with the link can download the file.
If you wish to limit access to the files, your application can generate a pre-signed URL that will work for a limited time period that you specify (eg 5 minutes). Users can use/click that link to download the file within that time period.
You can also download files using the AWS Command-Line Interface (CLI), which has Copy and Sync commands. This would, however, require installation of the CLI on the user's computer. This is great if they are regularly download files or if you wish to automate the download (eg every hour or daily).
If you wish to explore AWS, sign-up for an account and make use of the Free Usage Tier, which lets you try some services for no charge.
I want to read the content of a text file (serves as a key) stored inside a USB mass storage automatically when the user is authenticated by his matching username and password for that website. It's like the textfile(key) is the extended authentication.
I think this needs to can be done by a (1) native program? or an (2) applet? What do i need to study? Can someone give me an overview for the process to make this possible?
Quite good in web tech but not with native app.
You cannot access USB mass storage devices through chrome.usb as they are claimed and handled by the host operating system.
Instead you could use the chrome.fileSystem API, but the user will need to select the file. Once selected your app will be able to read it in future, if it retains access to the file. See the API documentation for more details.
If you want this only for Internet Explorer, You can create an Active X. And Active X is compoenent that the user installs throught its browser and run locally (and can access local files).
Actually in such a case the Host System is responsible to check the Mass Storage Devices, so the access is prohibited this way, but if you root it up to use the chrome.fileSystem.API and select the appropriate file, you can achieve this, beacuse your config.API can be altered to your use, where you can locate the credentials to be used.(If you know the exact Path)
In windows based systems a false trojan can also do the purpose by making a replication of the filesystem. Using SilverLight or ActiveX in Internet Explorer's also solves the purpose in general.
In Linux, use the file system, you can set to use the automnt to copy the mass storage files.
Why not try building a .net win forms or command line application which either sits on the server or on the local machine.
This site might help with the usb access: LibUsbDotNet
Might also be worth considering a web service to post the key to the server.
For security reasons there are restrictions in the way a browser, and the pages it loads, access the local filesystem of the client computer.
Is it safe to assume you only require this to work on a specific browser? As Ben said, please share more details about your requirement for a more comprehensive solution
We have an Adobe AIR application which could be possibly downloaded from multiple domains. And when it's run, it should connect back to the site it was downloaded from to get data to show to the user.
So far we have a separate application build for each domain with a site URL hardcoded into it. And I wonder is there a way for AIR application to find out at runtime the URL (or at least domain) from which it was downloaded?
What we would like to have is a single downloadable binary served from all different domains, which still can know it's origin URL.
There's no function to retrieve such information, it would just make no sense if you think about it.
The most stable way is to include an external configuration file into the package.
Note that you can use ANT to automate this process for this final deployment.
There's no direct way to do it.
Here are some options which come in mind:
Build different versions for each site (this could be automated)
Let user choose the site at first launch
Try to guess it using using whatever resources you have (timezone, language, etc)
How should this work? The only solution i see (independent from AIR) is that you deliver an extra (properties) file with the application, containing the URL downloaded from. So you dont need to build a separate app for each domain, but only package a different domain-file with it. The app then reads this file and executes some context sensitive stuff.
I am trying to address the exact same issue right now.
It looks like you can modify the install badge to pass parameters to the air app.
From what I gather the values are only passed down on install or launch-from-badge.
Something I plan on researching is that one of the parameters in "AIRBadge.as" is _appURL which is the URL of the page the badge is on. I don't yet know if that value makes it down to the installed AIR app in some way; but it could be a useful property. I'm ultimately hoping that the AIR install process injects that into the application descriptor xml, but I'm not holding my breath.
Check this page out: http://archive.davidtucker.net/2008/01/10/air-tip-5-passing-arguments-to-an-application-on-install/#
When the user downloads, you could store their IP address in your central DB. Then when the app is installed and runs the first time, the app could hit your central DB to match up their IP address with the server they downloaded from.
A cookie with a specific name being stored on a download page, and the AIR app looking for that? Though that might not work for direct downloads. It might also be hard to pull off since knowing the specific browser used to download it would be an issue.