In my content script, I want to monitor which file a is getting uploaded to a web application.
I monitor "change" event for any "input:file" element. It works on any site (such as Gmail) that uses "input:file".
However sites like imgur, use SWFUpload mechanism. I tried to capture "fileQueued" event on element that I suspected to be swfupload. But that did not work.
How can I capture file upload event for sites that use swfupload?
Are there any other plugins that manage file uploading that I would need to take care in my content script?
Is there any generic mechanism to tackle this problem?
(I am aware of drag-n-drop mechanism, but I have not handled that case so far.
I have also read following relevant question on SO:
Grab file with chrome extension before upload)
It's probably worth your time to experiment with the chrome.webRequest API; it appears that the onBeforeRequest event contains info about file uploads. It's a complex API with extra parameters to addListener; read the docs thoroughly.
Related
Consider this scenario:
A content script wants to upload a file. I would prefer this operation to be done from my service/background script, but passing a File to that side via messages seems to be somewhat impossible without weird workarounds.
This is a good reference for the workarounds available: Passing FormData/File Object from content script to background script in chrome extension with Manifest V3
Workaround 1 seems bad, since it will require to break up the request which is not compatible with the backend API. Workaround 2 seems insecure, since the host web page will definitely be able to send rogue messages to an embedded iframe as it will share context.
I'm considering having the content script perform the upload directly like this:
The content script loads the authentication secret from extension storage (chrome.storage.sync or chrome.storage.local depending on login persistence mode).
It calls fetch directly to upload the form data.
Is that safe?
One hazard I had in mind was that a host page could hook window.fetch to intercept the credentials. That doesn't seem possible after my testing (the content script has a separate fetch defined in its own isolated environment). Is there anything else to watch out for?
how you doing?
I'm trying to download a excel file from a web site (Specifically DataCamp) in order to use its data into an automatic process, but before to get the file is necessary to sign in on the page. I was thinking that this would be possible with the JSON Query on the HTTP action, but to be honest I don't know where to start (I'm new on Azure).
The process that I need to emulate to get the file extraction would be as follow (I know this could be possible with an API or RPA but I don't have any available for now):
Could you tell me guys some advices (how to get the desired result or at least where to make research)? is this even posibile?
Best regards.
If you don't have other ways, e.g. your source is on an SFTP, etc. than using an HTTP Action should work, pass the BODY to your next action (e.g. you might want to persist that on a BLOB if content is binary).
If your content is "readable", e.g. JSON, CSV and want to load for processing, you need to ensure, for large files, that you read it in Chunks to load it completely before processing.
Detailed explanation at https://learn.microsoft.com/en-us/azure/logic-apps/logic-apps-handle-large-messages#download-content-in-chunks
I have a custom function/method that needs to run on the browser (client side) every time the user uploads a picture to a web-server. This method modifies the image being uploaded and sends it to the server.
Currently the method is written in java so I thought of using an applet on the browser which could run this method and then send the modified picture to a servlet residing on the server, but the applet has certain disk read/write restrictions. I am aware of policies that can be used to grant these permissions to the applet but they need the users consent every time.
Also I want to avoid the applet .class file to be downloaded every time this page is viewed. So
Is there a cleaner approach to all this?
Are there any other technologies that can help me run this method on the browser ? (its ok if i have to rewrite the function in a different language)
Is writing a custom browser extension a good idea?
I think, that the JS using will be much better for this task.
One of JS image processing JS-library
, just for example.
How to invoke a servlet from JS example
Writing a browser extension is a really wrong way.
I know there's a way for extensions and pages to communicate locally, but I need to send a message from an outside URL, have my Chrome Extension listen for it.
I have tried easyXDM in the background page, but it seems to stop listening after awhile, as if Google "turns off" the Javascript in the background page after awhile.
I think you may try some walk around and build a site with some specific data structure, and then implement a content script which will look for this specific that specific data structure, and when i finds one it can fetch the data you want to be passed to your extension.
Yes, you need a content script that communicates with the page using DOM Events.. Instructions on how to do that are here:
http://code.google.com/chrome/extensions/content_scripts.html#host-page-communication
I'm trying to write a userscript/Chrome extension to capture JSON data being sent while using a web service so that I can reformat it and display selected portion on page. Currently the JSON is sent as the application loads (as I've observed from watching traffic with Fiddler 2). Is my only option to request the JSON again or is capture possible? As I'm not providing a code example, a requested answer is even some guidance on what method / topic to research or if I'm barking up the wrong tree.
No easy way.
If it is for a specific site you might look into intercepting and overwriting part of a code which sends a request. For example if it is sent on a button click you can replace existing click handler with your own implementation.
You can also try to make a proxy for XMLHttpRequest. Not sure if this even possible, never seen a working example. You can look at some attempts here.
For all these tasks you probably would need to run your javascript code out of sandboxed content script to be able to access parent page variables, so you would need to inject <script> tag with your code right into the page from a content script: