PHP Uploads

What is it?

In February 2023 for Cumulus MX version 3.24.0 a new PHP upload mechanism was introduced as an alternative to using FTP, FTPS, or SFTP (FTP over SSH).

It uses the HTTPS or HTTP protocol for transferring file data. It requires that you have a PHP enabled web server (most are), and that you upload a small PHP file to the root folder of your web site.

Cumulus MX then communicates with that script to transfer the data, and the script saves the data to a file on your web site.

It can transfer both text and binary files.

If the upload.php file is installed for CMX and the protocol works for CMX then it will also work for CUtils and the file locations will be relative to the location of the upload.php file (which therefore will be the root location of your website).

Is it secure?

Yes! It uses a shared secret generated by MX (or you can enter your own). This secret is entered into the PHP upload file before you upload it to your web site.

The secret is used by MX to create an encrypted hash of the upload. The upload script on your server generates its own hash and compares it with the one sent by MX with the data. If they do not match the upload is not allowed.

In addition to this, timestamps are used to ensure that an upload cannot be repeated by replaying the same upload.

Because no sensitive information is sent in the request, the PHP upload mechanism can be safely used with the plain old HTTP protocol

What are the advantages?

• It is fast!

• It is much faster than using FTP(S).
• It uses gzip compression of the data across the network (web server support required)

• It is reliable

• If your web site is up then it should work, it removes the reliance on your web providers FTP server working.

• It reduces bandwidth.

• Unlike FTP which uploads the whole file each time, the PHP upload can send incremental data. For the default web site, most the data is the graph files and every update each entire file is sent over FTP every time just to add one new data point. Using the PHP upload, just that new data point is sent for each file, and the PHP script appends it to the existing file on your server.
• It uses data compression over the network

Configuration

1. Run CMX and change the Upload protocol to PHP, set the URL to your web site + upload.php
2. Copy the suggested unique "PHP Secret" from the Internet Settings (or make up your own)
3. Edit the /webfiles/upload.php file, and change the default secret 'change_this_to_the_value_in_CMX' to the value in CMX
4. Copy the /webfiles/upload.php to your web server, place it in the root folder of the default web site along with the index.html files etc
5. You will need to update the paths for the NOAA Reports (probably needs to be just “Reports”) and any Extra Files you use
6. The uploads should start working!
7. You can now disable all the "Create local" options for files in Internet Settings|Interval Settings. Local copies of the files created in the /web folder are no longer required

It is important to understand the relative paths used by upload.php as this is quite different from FTP configurations where sometimes full paths are required (SFTP) or paths from the FTP root (which may differ when full ownership or shared hosting). All files will be transferred relative to that location. You can go deeper and sideways into the directory tree but not up.

Migrating your FTP settings

When setting the Upload protocol to PHP you need to make the following upload settings relative as well:

1. NOAA Reports
2. Extra Web Files
3. Disable 'Create local' copy unless required

TODO : other entries??

NOTE: The settings are valid not only when you use CMX but also for CumulusUtils, the last one does not have any setting for upload.PHP of its own!

Cumulus.ini

it is has its settings under CMX Cumulus.ini [FTP site] section.

The upload.php procedure file can be copied to any location you wish but the following CMX ini file parameters determine its operation and need to reflect its true location and CMX configuration (in case you are running more than one instance):

1. PHP-URL=<URL>
2. PHP-Secret=<key as configured in CMX>