Checking file extensions of uploaded files

Forum|Forum|17 years ago
December 12, 2008
1 reply
865 views

I am uploading an image using the code below, is there an easy way to tell if the server has received a JPG or a GIF?

<input type="file" name="image_1" size="90" style="background-color: #ededed; border-width: 1px; border-color: #ffcccc; color: black; font-size: 9pt;">

Advanced techniques

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D

dchard

Inspiring

I found this site that checks the extension file of the uploaded file.

http://www.bennadel.com/blog/834-Ask-Ben-Upload-And-Email-File-Using-ColdFusion.htm

Hope it helps

A

ACS LLCAuthor

Inspiring

Thanks for the reply,

I took a look but couldn't find anything relevant to the issue

-

-__cfSearching__-

Inspiring

> I took a look but couldn't find anything relevant to the issue

I only skimmed the entry. But it appears to use the uploaded file's extension to determine which file types are allowed. For example, this line tries to verify the file is a PDF, RTF or word document.

ie
<cfif NOT ListFindNoCase( "pdf,doc,rtf", CFFILE.ServerFileExt )>
....

You could use a similar check to determine if the uploaded file is a GIF or JPG (.jpg or .jpeg). Bear in mind file extensions can be changed. So extension alone does guarantee a file is of a particular type. It is more likely, but not a guarantee.

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