Nintendo eShop Website Change Tracker

eshop_page_changes.sh

#!/bin/bash

###################
#   GLOBAL VARS   #
###################
l_user="$1"

name="$2"
p_name="$3"
eshop_link="$4"
nsid="$5"

folder="/var/tmp/${name}"
n_page="${name}_page.html"
o_page="${name}_page_old.html"

n_path="${folder}/${n_page}"
o_path="${folder}/${o_page}"

subject="${p_name} Webpage Changes"
emails="$6"
purchase_link="https://ec.nintendo.com/title_purchase_confirm?title=${nsid}"
domain="<you pick :)>"

####################
#     FUNCTIONS    #
####################

print_usage() {
  echo "Usage:"
  echo "$0 <local_user> <game_name> <pretty_game_name> <eshop_link> <nsid> <comma_separated_emails>"
  echo ""
  echo "Example:"
  echo "$0 \"poop\" \"abc\" \"AbC\" \"https://www.nintendo.com/games/detail/<game or whatever>/\" \"700100000XXXXX\" \"my@email.com\" "
}

####################
#       MAIN       #
####################

if (( $# != 6 ))
then 
  print_usage
  exit 6
fi 

# Create folder if it doesn't exist
if [ ! -d ${folder} ] 
  then
  mkdir -p ${folder}
fi

# Move the last page check 
if [ -s ${n_path} ]
  then
  mv ${n_path} ${o_path}
fi

# Pull the new page
curl "${eshop_link}" > ${n_path} 2>/dev/null

# Verify that the old page exists again
if [ -s ${o_path} ]
then
  
  # Change the rights to the files because why not
  chmod 777 ${o_path}
  chmod 777 ${n_path}
  chown ${l_user}:${l_user} ${o_path} ${n_path}
  
  # See if there are any new changes
  status=$(sdiff -s ${o_path} ${n_path})
  #status="a" # This line is to test emails, uncomment to force an email
  
  # If we have any changes, send some stuff!
  if [ -n "${status}" ]
    then 
    echo "Changed detected"
    echo "OLD                 | NEW"
    echo ${status}
    mail -r "${name}-page-changes@${domain}" -s "${subject}" ${emails} < <(echo -e "OLD             | NEW "; echo ${status}; echo "${purchase_link}")
  fi
fi