load the file then change permissions

[stiffler]

Hey All

Great forum, I have honestly found most answers by searching old posts, except this one:

I have .pdf files which I keep chmod 600 for security reasons on my server. Although I want people who authenticate (.htaccess) to get access to these files, so what I want to happen is the following:

chmod (644, "file.pdf"
print "Location: file.pdf\n\n";
chmod (600, "file.pdf"


Although I noticed the reality is that the 2nd chmod happens too fast for the file to load. How can I load the file and print it to the screen once it has loaded then chmod it back to 600, but please realize this is not a normal .html file but a .pdf???

Any and every suggestion would be great!!!!

 

[devnull22]

Hi stiffler,

(1) you could use the sleep function before the second chmod

or

(2) open the file (in bin mode) print it to the
webserver then chmod it back.

hope this helps

 

[stiffler]

Hey Ken

I tried sleep and it didn't work very nicely at all, but can you give me an example of how to accomplish your (2) suggestion?

Thanks

 

[devnull22]

I haven't tested this but it "should work"

.
Let use a jpeg file for example.
---- view_pic.cgi ---
# open the image
# change the permissions
open (IMAGE,"$filename&quot || die "can't open $filename";

# I think this is the correct content-type ... get'n late
# need sleep.
print "Content-type: image/jpeg"; # let server know what's
# com'n.

while (<IMAGE>){
# start reading and writing to the webserver

print $_;
};
close (IMAGE);

# chmod back.

------------ end script ----------
example usage :
<img src=&quot;view_pic.cgi&quot;>

Hope this gives you some ideas

Cheers

 

[stiffler]

Only problem with that is that is doesn't determine the size of the pdf, for instance if the pdf is 2MB versus 50KB, any other workarounds??

thanks
JK

 

[devnull22]

Hi JK,

Use the -s $filename option. This will check if the
file has nonzero size and returns the size of the file.

cheers