onecatper.day/rss_update.py

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from random import randint
import datetime
#might as well use the datetime we made in main for consistency
from main import DATETIME_STR
# updates the guid given in two places with the RSS file, essential for letting readers know
# a new picture has been published
# refrence: https://cyber.harvard.edu/rss/rss.html#ltguidgtSubelementOfLtitemgt
# also updates pubDate and lastBuildDate
# finay, updates the image name as well
def update_rss_feed(rss_file_name):
rss_file = ""
with open(rss_file_name, "r") as f:
rss_file = f.read()
element_list = rss_file.split('\n')
items = []
for el in element_list:
if "link" in el:
items.append(el)
if "guid" in el:
items.append(el)
if "enclosure" in el:
items.append(el)
if "<lastBuildDate>" in el:
items.append(el)
if "<pubDate>" in el:
items.append(el)
guid_items = []
for el in items:
if "https://onecatper.day#" in el:
guid_items.append(el)
hash_located_at = []
for el in guid_items:
hash_located_at.append(el.index('#'))
CLOSING_TAG_LENGTH = 7
as_char_list = list(items[2])
for i in range(hash_located_at[0] + 1, len(as_char_list) - CLOSING_TAG_LENGTH):
as_char_list[i] = str(randint(0, 9))
new_guid_link_one = "".join(as_char_list)
as_char_list = list(items[4])
for i in range(hash_located_at[1] + 1, len(as_char_list) - CLOSING_TAG_LENGTH):
as_char_list[i] = str(randint(0, 9))
new_guid_link_two = "".join(as_char_list)
split_file = rss_file.split("\n")
old_guid_links = []
for element in split_file:
if "https://onecatper.day#" in element:
old_guid_links.append(element)
# preppring strings for replacement of the old strings
# cat image stored in img/
old_img_link = items[-1].split(" ")
old_cat_image = old_img_link[-1].split("\"")
old_cat_image_url = old_cat_image[1]
new_cat_image_url = f"https://onecatper.day/img/cat{DATETIME_STR}.jpg"
# storess dates and times in the rss.xml file, needs to be updated for feed to update
old_last_build_date = items[1]
old_pub_date = items[3]
# date and time need to be a specific format
# don't want to use constant for this, it needs to be formated
rss_date = datetime.datetime.strftime(datetime.datetime.now(), "%a, %d %b %Y %H:%M:%S -0500")
# create new date/time links for feed
new_last_build_date = f"\t\t<lastBuildDate>{rss_date}</lastBuildDate>"
new_pub_date = f"\t\t\t<pubDate>{rss_date}</pubDate>"
# replace what is necessary to make the feed update
rss_file = rss_file.replace(old_guid_links[0], new_guid_link_one)
rss_file = rss_file.replace(old_guid_links[1], new_guid_link_two)
rss_file = rss_file.replace(old_cat_image_url, new_cat_image_url)
rss_file = rss_file.replace(old_last_build_date, new_last_build_date)
rss_file = rss_file.replace(old_pub_date, new_pub_date)
# write the changes to disk
with open(rss_file_name, "w") as f:
f.write(rss_file)
update_rss_feed("rss.xml")