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Mar 15, 2021

Single .php File Host

Minimalistic file host in a single PHP script.

curl-able like any proper file host and pastebin ought to be.
i.e. you can upload a file via curl -F "file=@/path/to/your/file.jpg" https://example.com/

Uploaded files get randomised names but keep their extensions. That means serving them is easily outsourced to the web server and is not handled by this script.

There's also a mechanism for removing files over a certain age, which can be invoked by calling the script with a command line argument.

Config

All configuration is done using the global variables at the top of index.php. Hopefully they're explained well enough in the short comments besides them.

To accommodate for larger uploads, you'll also need to set the following values in your php.ini:
upload_max_filesize
post_max_size
max_input_time
max_execution_time
(The output of index.php will also warn you, if any of those are set too small)

The code responsible for the default info text can be found at the very bottom of index.php, in case you want to reword anything.

Apache

<Directory /path/to/webroot/>
    Options +FollowSymLinks -MultiViews -Indexes
    AddDefaultCharset UTF-8
    AllowOverride None

    RewriteEngine On
    RewriteCond "%{ENV:REDIRECT_STATUS}" "^$"
    RewriteRule "^/?$" "index.php" [L,END]
    RewriteRule "^(.+)$" "files/$1" [L,END]
</Directory>

<Directory /path/to/webroot/files>
    Options -ExecCGI
    php_flag engine off
    SetHandler None
    AddType text/plain .php .php5 .html .htm .cpp .c .h .sh
</Directory>

Nginx

root /path/to/webroot;
index index.php;

location ~ /(.+)$ {
    root /path/to/webroot/files;
}

location = / {
    include fastcgi_params;
    fastcgi_param HTTP_PROXY "";
    fastcgi_intercept_errors On;
    fastcgi_param SCRIPT_NAME index.php;
    fastcgi_param SCRIPT_FILENAME /path/to/webroot/index.php;
    fastcgi_param QUERY_STRING $query_string;
    fastcgi_pass 127.0.0.1:9000;
}

Purging Old Files

To check for any files that exceed their max age and delete them, you need to call index.php with the argument "purge"

php index.php purge

To automate this, simply create a cron job:

0 0 * * * cd /path/to/the/root; php index.php purge > /dev/null

If you specify $STORE_PATH using an absolute path, you can omit the cd

Max. File Age

The max age of a file is computed using the following formula:

$file_max_age = $MIN_FILEAGE +  
                ($MAX_FILEAGE - $MIN_FILEAGE) *  
                pow(1-($fileSize/$MAX_FILESIZE),$DECAY_EXP);

...which is a basic exponential decay curve that favours smaller files, meaning small files are kept longer and really big ones are deleted relatively quickly.
$DECAY_EXP is one of the configurable globals and basically makes the curve more or less exponential-looking. Set to 1 for a completely linear relationship.

Related Things

FAQ

Q: Can you add this or that feature?
A: This is mostly just a snapshot of what I'm doing on x0.at. But I'm open to suggestions and PRs, as long as they do something useful that can't be done outside of the script itself (e.g. auth could be done in a .htaccess, malware scanning can be done in the EXTERNAL_HOOK, ...) and they don't go against the KISS principle.

Q: Why is the index page so ugly? (And PRs regarding styling)
A: To some degree because of KISS, but also because I'm not trying to make the next super flashy, super popular Megaupload clone. This is more aimed at a minority of nerds with command line fetishes.

Q: OMG hosting this without user accounts or logins is so dangerous! Change that now!!1
A: I've been running x0.at for years now and like to think I know what I'm doing. I'll maybe consider changing how I run it, should it become a problem. But I also don't see that as a concern to be dealt with inside this script. If you want to run your copy of this with logins, use basic auth on top of it or something.

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Simple Filehosting Page in a Single PHP File (obvious 0x0 clone)

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