Easily Firebase user accounts without the Forge

collect-firebase-user-accounts.sh

#!/bin/bash

# See : https://calendee.com/2015/02/04/retrieving-all-firebase-registrations/

USAGE="USAGE: collect-firebase-user-accounts.sh {file-name-prefix} {firebase-name} {forge-token}" 

# Start at 0
start=0

# Firebase restricts you to 1000
limit=1000

# Continue until this changes to 0
i=1

# Use the Date and Time in the File Name
now=$(date +"%Y-%m-%d_%H%M")

# While i is not 0, loop through accounts
while [ $i -gt 0 ]
do

	# Prefix the output file name and increment it
	file=$1"_"$now"_"$i".json"

	# The firebase url to download users
	url="https://auth.firebase.com/v2/"$2"/users?token="$3"&limit="$limit"&offset="$start

	echo ""
	echo "Outputting $url to $file" 

	# Dump the results of the request to the file
	curl "$url" > $file

	# Increment the counter and starting point
	let start=$limit*$i
	(( i++ ))

	# If the file has an empty users array, then we're done : "users":[]
	result=$(grep -i "\[\]" $file)
	if [ ! -z $result ]; then
		echo "No more users to download"
		echo ""
		# Stop the while loop
		i=0
	fi

	continue

echo ""

done