Cron job to compress the images on a server

compress.py

# sudo apt-get install jpegoptim
# sudo apt-get install optipng
# jpegoptim -m90  04/*.jpg
# optipng 02/sharp_ps2_8x6.png

import os
import time
import glob
from subprocess import call
from datetime import datetime, timedelta
from os.path import join, getsize

path = '/var/www/html/wordpress/wp-content/uploads'
DELETE_OLD_DAYS = 3


def get_old_dates(days=0):
    for day in range(0, days):
        yield datetime.now() - timedelta(days=day)


def cron_job():
    for dat in get_old_dates(DELETE_OLD_DAYS):
        dir_name = '%s/%s' % (path, dat.strftime('%Y/%m'))
        try:
            for filename in os.listdir(dir_name):
                info = os.stat('%s/%s' % (dir_name, filename))
                # get modified time.
                tim = time.localtime(info.st_mtime)
                if tim.tm_year == dat.year and tim.tm_mon == dat.month and tim.tm_mday == dat.day:
                    print tim.tm_year, dat.year, "  ", tim.tm_mon, dat.month, "  ", tim.tm_mday, dat.day
                    file_path = '%s/%s' % (dir_name, filename)
                    print file_path
                    ext = file_path.split('.')[-1].upper()
                    if ext in ['JPG', 'JPEG']:
                        call(["jpegoptim", "-m90", file_path])
                    if ext in ["PNG", "GIF", "BMP"]:
                        call(["optipng", file_path])

                    old = int((dat - timedelta(days=DELETE_OLD_DAYS + 1)).strftime('%s'))
                    os.utime(file_path, (old, old))
        except OSError as ex:
            # print ex
            pass


def optimize_all():
    for dp, dn, filenames in os.walk(path):
        for fil in filenames:
            file_path = os.path.join(dp, fil)
            print file_path
            ext = file_path.split('.')[-1].upper()
            if ext in ['JPG', 'JPEG']:
                call(["jpegoptim", "-m90", file_path])
                call(["chown", "www-data:www-data", file_path])
                call(["chmod", "664", file_path])
            if ext in ["PNG", "GIF", "BMP"]:
                call(["optipng", file_path])
                call(["chown", "www-data:www-data", file_path])
                call(["chmod", "664", file_path])

optimize_all()