Download file coldfusion

Specify the extensions with a. That is, only. In this example, accept is set to. So, only files with. Even if the file is originally a PDF sample. To use a different file, modify the following section of upload. If you set strict as false, then both the files are uploaded. To use a different file, modify the following snippet of upload. Legal Notices Online Privacy Policy.

Description Manages interactions with server files. Category File management tags Syntax The tag syntax depends on the action attribute value. See the following sections. ColdFusion MX 7: Added the result attribute, which allows you to specify an alternate variable in which to receive result parameters. ColdFusion MX 6. In ColdFusion, filenames were made unique by appending an additional "1" for each file, as in 1, 11, , and so on. Downloading file from url ColdFusion Ask Question.

Asked 8 years, 5 months ago. Active 8 years, 5 months ago. Viewed 6k times. Improve this question. Leigh Janusz Chudzynski Janusz Chudzynski 2, 3 3 gold badges 31 31 silver badges 45 45 bronze badges. Add a comment. Active Oldest Votes. Improve this answer. Michael C. O'Connor Michael C. You're right that just using an ID by itself wouldn't secure the file, but I was assuming a certain kind of application logic would be used to make sure that only authorized users could get at certain files.

For instance, the permissions table could hold a lookup ensuring that certain files were only available to certain groups or certain users. If you modified the URL string in your browser to pass in the ID for a different file, the application wouldn't find you via the database lookup and wouldn't download the file to you. Let me know if that doesn't make sense. If a user was to right click and to choose save target as, would they be able to save the file?

Or would this try and have them save a. I have had instances that when they have chosen to save target it has prompted as the file name "a file name. Has anyone experienced that? I've experience the same problem, where the Save File dialog box presents you with a. I find IE to be a particularly problematic browser for this.

I've seen one kludgy workaround for the issue: instead of sending URL parameters via a query string e. There are several code libraries out there which can help you parse the CGI. The server gets the variables, and the browser thinks it's downloading a file with the name of whatever comes after the last slash. Whoops-- I shouldn't have included the double foreslash in my comment above.

The proposed path info URL should be "index. Tom, i love the slash idea, that makes sense. I am going to be changing the site over to slash notation for better SEO so that would match the rest of the site as well. As Ben touches on, one has to wait around whilst CF transfers it why CF does not pass this off to the file system, I have no idea.

This is not a consideration for occasional small file transfers, but it's a significant one in busy environments or when large files are concerned. Thanks for driving that point home. I don't generally work with high traffic sites, so did not want to speak with authority Avoid it unless you absolutely have to have the security. Just yesterday I had a server lockup several times as I watched the thread count rise during a session where I suspect a group of students had been told to go and download some documents.

I'm using the second version of the above to change the name of existing files to something a little more web friendly. Any guesses? Glad to help in some way. Streaming files can take up some resources, but from what I have seen, ColdFusion seems to handle it well. When you say "dies", how do you know? Does ColdFusion service restart? In cases like that, you have to come up with a way to unique identify the file in the URL.

Either you need to use some sort of database-generated ID, or perhaps you could use something like the hash of the file path.

As such, you just need a way to integrate that difference into the URL. Ben, you made a comment in the proxy. Could you give me an idea how to accomplish that. Therefore, we are going to set it so that only content within a set of CFOutput tags will be written to the content buffer. This will be the name of a file that we are going to let the user download.

This assumes that all of our files are in the same directory otherwise, we would need to know more about the location for this specific file. This logging could be to a database, but for the purposes of this example, we are going to log this download to a text file. ID -- ID of the logged-in user. File -- Name of the file being downloaded.

ID URL. There are two ways to go about this. CFContent would allow us to stream non-web-accessible files but puts processing time on the ColdFusion server. CFLocation does not really put any work on the CF server, but it means the files must be accessible via the web. This will log the clicks and then forward the user to the requested file. You can use the file extension to help figure this out.

While this does NOT affect the content of the file itself, it will help the client deal with file once it is downloaded. This is the best option if you expect to be getitng lots of image requests.

We can also tell the client what the suggested file name of the asset is. By doing this, we can grab files that are outside of the web root. This gives us more security access options. Notice that we have to use the Full Server Path for this file since COldFusion needs to know exactly where to find it. Also, we are passing back the file's mime type which we calculated above.

This will help the client figure out how to best deal with the resultant file. Rich, I like the idea of having a preview page before you have to download the file.

Rich, I think that is good. Ben- For super-secret, super-large files, we do have additional functionality in place.

Scott May 15, at PM 1 Comments. Rich, I really like the email with the link idea. I have never thought of that.