This PHP app creates image thumbnails from PDF file names passed to it.
The script needs two configuration variables to work:
SOURCE_PATH- The directory where the script can find the PDFs.THUMBNAIL_PATH- The directory where the script will put the generated thumbnails. The directory must be writable.
If you host the app in a subdirectory you can strip the subdirectory path
with the variable URL_PREFIX.
Example: SOURCE_PATH is /var/www/pdf, THUMBNAIL_PATH is
/var/www/images, the web server document root is /var/www/htdocs,
URL_PREFIX is /thumbnail. The user requests the URL
https://example.com/thumbnail/2020/03/info.pdf.jpg. The script will
strip the host name, /thumbnail prefix and .jpg suffix from the URL
and look for the file /var/www/pdf/2020/03/info.pdf and will create
the file /var/www/images/2020/03/info.pdf.jpg
- PHP 8.2
- ImageMagick with ghostscript
In the example directory you can see a docker-compose setup that uses
the thumbnail generator as a proxy for missing images.
On the first run, the thumbnails directory is empty. On reload, the web
server will serve the generated files.
At the moment, this is a simple script and thin wrapper around a
shell call to convert. In the future, I can imagine the following
features:
- Give image dimensions and output type (png, webm) via file name
- More flexible name lookup
- Use PHP integration of ImageMagick
- Add support for more input file types
- Command line tool