#!/bin/bash
set -eu

target_dir="${1:-.}"
days=3650
rsa_bits=2048
org="httplib2-test"
server_cn="localhost"
subj_prefix="/C=ZZ/ST=./L=./O=$org/OU=."

main() {
	cd "$target_dir"
	gen
	check
}

check() {
	echo "- check keys" >&2
	openssl rsa -in ca.key -check -noout
	openssl rsa -in client.key -check -noout
	openssl rsa -in client_encrypted.key -check -noout -passin pass:12345
	openssl rsa -in server.key -check -noout

	echo "- check certs" >&2
	for f in *.pem ; do
		openssl x509 -in "$f" -checkend 3600 -noout
	done
}

gen() {
	echo "- generate keys, if absent" >&2
	[[ -f ca.key ]] || openssl genrsa -out ca.key $rsa_bits
	[[ -f client.key ]] || openssl genrsa -out client.key $rsa_bits
	[[ -f client_encrypted.key ]] || openssl rsa -in client.key -out client_encrypted.key -aes128 -passout pass:12345
	[[ -f server.key ]] || openssl genrsa -out server.key $rsa_bits

	echo "- generate CA" >&2
	openssl req -batch -new -nodes -x509 -days $days -subj "$subj_prefix/CN=$org-CA" -key ca.key -out ca.pem
	openssl req -batch -new -nodes -x509 -days $days -subj "$subj_prefix/CN=$org-CA-unused" -key ca.key -out ca_unused.pem

	echo "- generate client cert" >&2
	openssl req -batch -new -nodes -out tmp.csr -key client.key -subj "$subj_prefix/CN=$org-client"
	openssl x509 -req -in tmp.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out client.crt -days $days -serial -fingerprint
	cat client.crt client.key >client.pem
	cat client.crt ca.pem client.key >client_chain.pem

	echo "- generate encrypted client cert" >&2
	openssl req -batch -new -nodes -out tmp.csr -key client_encrypted.key -passin pass:12345 -subj "$subj_prefix/CN=$org-client-enc"
	openssl x509 -req -in tmp.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out client_encrypted.crt -days $days -serial -fingerprint
	cat client_encrypted.crt client_encrypted.key >client_encrypted.pem

	echo "- generate server cert" >&2
	openssl req -batch -new -nodes -out tmp.csr -key server.key -subj "$subj_prefix/CN=$server_cn"
	openssl x509 -req -in tmp.csr -CA ca.pem -CAkey ca.key -CAcreateserial -out server.crt -days $days -serial -fingerprint
	cat server.crt server.key >server.pem
	cat server.crt ca.pem server.key >server_chain.pem

	rm tmp.csr
}

main