slack-file-delete-truncate.sh

#!/usr/bin/env bash
# Slack files prune script for clearing up space for free slack accounts.

# Config
TOKEN="<your token>"
URL_BASE="https://slack.com/api/"

# API endpoints 
URL_LIST="${URL_BASE}files.list"
URL_FILE_DELETE="${URL_BASE}files.delete"

get_file_lists() {
    # Make the first request and figure out how many pages.
    curl -X POST "${URL_LIST}?token=${TOKEN}" -o files.1.json
    NUM_PAGES=`jq '.paging.pages' files.1.json`

    for page in `seq 1 ${NUM_PAGES}`;
    do
        curl -X POST "${URL_LIST}?token=${TOKEN}" -F "page=${page}" -o "files.${page}.json"
    done
}

delete_files() {
    # Make an array out of file IDs in JSON data.
    for page in `seq ${NUM_PAGES} 1`;
    do
        FILE_JSON="files.${page}.json"
        FILE_IDS=`jq '.files[].id' ${FILE_JSON}`
        FILE_IDS_ARR=(${FILE_IDS//$'\n'/ })

        for FILE_ID in "${FILE_IDS_ARR[@]}"
        do
            FILE_ID=${FILE_ID//\"}
            echo "Deleting: ${FILE_ID}"
            curl -X POST ${URL_FILE_DELETE}?token=${TOKEN} -F "file=${FILE_ID}"
            echo ""
        done
    done
}

echo "Calling files.list: Loading entire history of files uploaded/shared."
get_file_lists

echo "Calling files.delete: Deleting batch of files"
delete_files