Delete old slack files

delete_old_slack_files.sh

#!/bin/bash

# Delete old slack files that are older than 30 days

# Api Token
# Get token from https://api.slack.com/custom-integrations/legacy-tokens
TOKEN=${SLACK_TOKEN?:"No token Provided"}

# 30 Days ago (The -v option is BSD Unix/Mac Specific)
MONTH_BEFORE=`date -v-30d +%s`

FILE_LIST_JSON="/tmp/slack_file_list.json"

# Call the files.list API for file types: images,pdfs,videos 
curl -X GET https://slack.com/api/files.list\?token\=${TOKEN}\&ts_to\=${MONTH_BEFORE}\&types=images%2Cpdfs%2Cvideos%2Czips\&pretty\=1 > $FILE_LIST_JSON

# Show the filenames to be deleted
echo "Deleting files:"
grep \"name\"\: ${FILE_LIST_JSON} | cut -d\" -f4 | cat -n

# Get list of file ids
FILE_IDS=`grep \"id\"\: ${FILE_LIST_JSON} | cut -d\" -f4`

# Turn the file_list into an array
IFS=$'\n' file_list=( ${FILE_IDS} )

echo "Deleting Number of files: ${#file_list[@]}"

# Delete file one at a time
for file in ${file_list[@]}; do
    echo "Deleting file: $file \n" 
    # Call the files.delete API
    curl https://slack.com/api/files.delete\?token\=${TOKEN}\&file\=${file}
    sleep 1.5 # Handle API rate limiting on delete
done

# Remove file list
rm -f ${FILE_LIST_JSON}