Shell script to download raw JSON of a set of Wekan boards

wekan_backup.sh

#!/bin/bash
set -eo pipefail

# Based on https://wekan.github.io/api/v2.55/#wekan-rest-api

if [[ $# < 3 ]]; then
    printf "Usage:

$0 <server address> <export directory> <board>...\n"
    exit 1
fi

ADDRESS="$1"
DATA_DIR="$2"
shift && shift
TARGET_BOARDS="$@"

if [[ ! -d ${DATA_DIR} ]]; then
    printf "Data dir '%s' does not exist!\n" ${DATA_DIR}
    exit 1
fi

BACKUP_TIME=$(date --iso-8601=minutes)
LOGIN_RESP_TEMP=$(mktemp /tmp/wekan_login.XXXXXXX.txt)

# From https://stackoverflow.com/questions/64786/error-handling-in-bash
cleanup() {
    rm -f ${LOGIN_RESP_TEMP}
}
trap cleanup 0

# Get creds
# `read` from https://ryanstutorials.net/bash-scripting-tutorial/bash-input.php
if [[ -z ${WEKAN_USERNAME} ]]; then
    read -p "Username not in env, please enter: " WEKAN_USERNAME
fi
if [[ -z ${WEKAN_PASSWORD} ]]; then
    read -sp "Password not in env, please enter: " WEKAN_PASSWORD
    printf "\n"
fi

# Login
printf "\nLogging in..."
curl -fs -X POST "${ADDRESS}/users/login" \
    -H "Content-Type: application/x-www-form-urlencoded" \
    -H "Accept: application/json" \
    -d "username=${WEKAN_USERNAME}&password=${WEKAN_PASSWORD}" \
    -o ${LOGIN_RESP_TEMP}
printf "success\n"

printf "\nExtracting login token..."
token=$(jq .token ${LOGIN_RESP_TEMP} | sed 's/"//g')
printf "success\n\n"
cleanup

# Download boards
for board in ${TARGET_BOARDS}; do
    printf "Getting board %s..." ${board}
    curl -sf -X GET "${ADDRESS}/api/boards/${board}/export" \
        -H "Accept: application/json" \
        -H "Authorization: Bearer ${token}" \
        -o "${DATA_DIR}/${board}_${BACKUP_TIME}.json"
    printf "success\n"
done