get_access_code.py

# run this first

import praw
from bot_config import *
 
r = praw.Reddit('OAuth getter for wizards_to_imgur script')
r.set_oauth_app_info(client_id=reddit_client_id,
                     client_secret=reddit_client_secret,
                     redirect_uri=reddit_redirect_uri)
 
# get_authorize_url takes 3 params:
# 1) state: a string of your choice that represents this client
# 2) scope: the reddit scope(s) we ask permission for
# 3) refreshable: determines whether we can refresh the access_token which will allow permanent access
scope = 'identity read submit'
url = r.get_authorize_url(user_agent, scope, True)
 
import webbrowser
webbrowser.open(url)

# the GET value of the page you're redirected to will contain an access code, set it as
# the corresponding value of access_code in get_access_information.py

get_access_information.py

# run this second

import praw
from bot_config import *
 
access_code = '<access code here>'
 
red = praw.Reddit(user_agent=user_agent)
red.set_oauth_app_info(client_id=reddit_client_id,
                       client_secret=reddit_client_secret,
                       redirect_uri=reddit_redirect_uri)
access_info = red.get_access_information(access_code)
 
with open('access_information.txt', 'w') as file:
    file.write(str(access_info))

magic_bot.py

# this is the actual bot. after the access information is saved just run this file
# the following bash script (runbot.sh) will run this script once a minute until stopped.

import praw
import re
import os
import ast
 
from bot_config import *
from imgurpython import ImgurClient
 
replies_file_name = 'posts_replied_to.txt'
 
if not os.path.isfile(replies_file_name):
    posts_replied_to = []
else:
    with open(replies_file_name, 'r') as file:
        id_list = file.read()
        id_list = id_list.split('\n')
        posts_replied_to = [id for id in id_list if id is not None and id is not '']
 
newly_replied_to = []
 
reddit = praw.Reddit(user_agent=user_agent)
reddit.set_oauth_app_info(client_id=reddit_client_id,
                          client_secret=reddit_client_secret,
                          redirect_uri=reddit_redirect_uri)
 
with open('access_information.txt', 'r') as rf:
    info = rf.read()
    access_information = ast.literal_eval(info)
    reddit.set_access_credentials(**access_information)
 
reddit.refresh_access_information(access_information['refresh_token'])
 
subreddit = reddit.get_subreddit('magictcg')
url_pattern = r'^https?:\/\/(www\.)?media\.wizards\.com\/.+\.(png|jpg)$'
imgur_client = ImgurClient(imgur_client_id, imgur_client_secret)
 
submissions = subreddit.get_new(limit=25)
for submission in submissions:
    s = '{0}^ ({1}) {2} [{3}]'.format(submission.score, submission.id, submission.title, submission.url)
    match = re.search(url_pattern, submission.url)
    if match and submission.id not in posts_replied_to:
        image = imgur_client.upload_from_url(submission.url, config=None, anon=True)
        comment = '[{0}]({0})\n\n' \
          'This is bot rehosts images that might otherwise be blocked for people. ' \
          'For issues contact <my user account>'
        comment = comment.format(image['link'])
        submission.add_comment(comment)
        newly_replied_to.append(submission.id)
        print(s)
 
with open(replies_file_name, 'a') as file:
    for post_id in newly_replied_to:
        file.write(post_id + '\n')

runbot.sh

#!/bin/bash
 
while :
do
    python3 magic_bot.py
    sleep 1m
done