#!/bin/bash

_SQLITE=$( which sqlite3 2>&1 )
if [ $? -ne 0 ]; then
    echo "sqlite3 is missing" >&2
    return 1
fi

echo "test" | openssl enc -e -aes-256-cbc -pbkdf2 -k test 2>/dev/null > /dev/null
if [ $? -ne 0 ]; then
    echo "openssl does not exists nor support pbkdf2" >&2
    return 1
fi

_AUTH_DB=$RBASH_HOME/keystore.db
_AUTH_SECRET=
_KSTORE_DEF_PROP=${_KSTORE_DEF_PROP:-val}
_KSTORE_DEC_FAILED="$RBASH_HOME/.decypt-failed"
_KSTORE_TABLE=store

if [ -f "$RBASH_HOME/keystore.secret" ]; then
	_AUTH_SECRET=$( cat "$RBASH_HOME/keystore.secret" )
fi


function kstore {
	case $1 in
		add) shift; _kstoreadd "$@" ;;
		del) shift; _kstoredel "$@" ;;
		get) shift; _kstoreget "$@" ;;
		list) shift; _kstorelist "$@" ;;
		query) shift; _kstorequery "$@" ;;
		update) shift; _kstoreupdate "$@" ;;
		search) shift; _kstoresearch $@ ;;
		secret) shift; _kstoresecret $@ ;;
		*)
			__func_head "add [key] [value|file|-] [prop, default: $_KSTORE_DEF_PROP]"
			__func_help "update [key] [value|file|-] [prop, default: $_KSTORE_DEF_PROP]"
			__func_help "get [key] [prop, default: $_KSTORE_DEF_PROP]"
			__func_help "del [key] [prop, default: $_KSTORE_DEF_PROP]"
			__func_help "list"
			__func_help "search [key] [prop]"
			__func_help "secret ..."
			__func_help "upload s3-compatible-provider-name"
			__func_help "query SQL"
			return 1
			;;
	esac
	return $?
}

function _kstore {
    local CUR=${COMP_WORDS[COMP_CWORD]}
	local SCOPE=${COMP_WORDS[COMP_CWORD-1]}
	local t

	COMPREPLY=()

	case "$SCOPE" in
		kstore)
			COMPREPLY=( $(compgen -W "add del get list query update search secret" -- $CUR) )
			return
			;;
		get|update)
			COMPREPLY=( $(compgen -W "$( _kstorequery "SELECT DISTINCT key FROM $_KSTORE_TABLE" )" -- $CUR) )
			;;
	esac

	t=${COMP_WORDS[COMP_CWORD-2]}
	case "$t" in
		get|update)
			t=`_kstorequote "$SCOPE"`
			COMPREPLY=( $(compgen -W "$( _kstorequery "SELECT DISTINCT prop FROM $_KSTORE_TABLE WHERE key = '$t'" )" -- $CUR) )
			;;
	esac
}

complete -F _kstore kstore

function _kstoresecret {
	case "$1" in
		clear) shift; _kstoresecret-clear "$@" ;;
		config) shift; _kstoresecret-config "$@" ;;
		change) shift; _kstoresecret-change "$@" ;;
		*)
			__func_head "clear"
			__func_help "config"
			__func_help "change"
			;;
	esac
}

function _kstoreinit {
	if [ ! -f "$_AUTH_DB" ]; then
		cat <<___SQL___ | $_SQLITE "$_AUTH_DB"
CREATE TABLE IF NOT EXISTS $_KSTORE_TABLE (
	key TEXT NOT NULL
	, prop TEXT NOT NULL
	, data TEXT
	, PRIMARY KEY( key ASC, prop ASC )
);
___SQL___
		chmod 600 "$_AUTH_DB"
	fi
	kstore secret config
}

function _kstorequote {
	echo -n "$1" | sed -e "s/'/''/g"
}

function _kstoreenc {
	if [ -z "$_AUTH_SECRET" ]; then
		echo "Secret key is not set yet" >&2
		return 1
	fi

	if [ "$1" == "-" ]; then
		openssl enc -e -aes-256-cbc -pbkdf2 -k "$_AUTH_SECRET" -a -A
	elif [ -f "$1" ]; then
		openssl enc -e -aes-256-cbc -pbkdf2 -k "$_AUTH_SECRET" -a -A -in "$1"
	else
		echo -n "$1" | openssl enc -e -aes-256-cbc -pbkdf2 -k "$_AUTH_SECRET" -a -A
	fi
}

function _kstoredec {
	if [ -z "$_AUTH_SECRET" ]; then
		echo "Secret key is not set yet" >&2
		return 1
	fi

	openssl enc -d -aes-256-cbc -pbkdf2 -k "$_AUTH_SECRET" -a -A
	_code=$?
	if [ $_code -ne 0 ]; then
		touch $_KSTORE_DEC_FAILED
		return $_code
	fi
}

function _kstoresecret-auto {
	case $OSTYPE in
		darwin*) _kstoresecret-macos "$@" ;;
		cygwin) _kstoresecret-cygwin "$@" ;;
		*)
			echo "$OSTYPE is Not supported yet" >&2
			;;
	esac
}

function _kstoresecret-cygwin {
	local _A

	which kstorecred 2>/dev/null > /dev/null
	if [ $? -ne 0 ]; then
		_kstoredl-kstorecred
	fi

	case $1 in
		get)
			_A=$( kstorecred get )
			if [ $? -ne 0 ]; then
				return 1
			fi
			_AUTH_SECRET="$_A"
			;;
		set)
			kstorecred set "$_AUTH_SECRET"
			;;
		del)
			kstorecred del
			;;
		*)
			echo "Unknown action: $1" >&2
			return 1
			;;
	esac
}

function _kstoresecret-macos {
	local _A
	case $1 in
		get)
			_A=`security find-generic-password -a default -gs rbash-kstore 2>&1 | grep ^password | cut -c 11-`
			if [ $? -ne 0 ]; then
				return 1
			fi
			_AUTH_SECRET="${_A:1:-1}"
			;;
		set)
			security add-generic-password -a default -s rbash-kstore -w "$_AUTH_SECRET"
			;;
		del)
			security delete-generic-password -a default -s rbash-kstore
			;;
		*)
			echo "Unknown action: $1" >&2
			return 1
			;;
	esac
}

function _kstoresecret-config {
	local _CONFIRM
	if [ -f "$_KSTORE_DEC_FAILED" ]; then
		rm $_KSTORE_DEC_FAILED
		_AUTH_SECRET=
	fi
	if [ -z "$_AUTH_SECRET" ]; then

		_kstoresecret-auto get
		if [ -n "$_AUTH_SECRET" ]; then
			return 0
		fi

		read -sp "Enter passphrase: " _AUTH_SECRET
		echo
		if [ -z "$_AUTH_SECRET" ]; then
			echo "Passphrase cannot be empty" >&2
			return 1
		fi

		case $OSTYPE in
			cygwin|darwin*)
				read -p "Save this password to OS's keystore? (y/n): " _CONFIRM
				if [ "$_CONFIRM" != "y" ]; then
					return 0
				fi
				_kstoresecret-auto set
			;;
		esac
	fi
}

function _kstoresecret-change {
	_kstoresecret-config

	local _NEW_SECRET i _key _prop _O_SECRET _BAK
	read -sp "Enter the new passphrase: " _NEW_SECRET
	echo
	read -sp "Enter the passphrase again: " i
	echo
	if [ "$i" != "$_NEW_SECRET" ]; then
		echo "Passphrase mismatched" >&2
		return 1
	fi

	_BAK=$( mktemp )
	cp "$_AUTH_DB" "$_BAK"

	echo "Backed up at $_BAK"

	_O_SECRET="$_AUTH_SECRET"
	for i in `$_SQLITE -list "$_AUTH_DB" "SELECT _ROWID_ FROM $_KSTORE_TABLE;"`; do
		_AUTH_SECRET=$_O_SECRET
		_key=`$_SQLITE -list "$_AUTH_DB" "SELECT key FROM $_KSTORE_TABLE WHERE _ROWID_ = $i;"`
		_key=`_kstorequote "$_key"`
		_prop=`$_SQLITE -list "$_AUTH_DB" "SELECT prop FROM $_KSTORE_TABLE WHERE _ROWID_ = $i;"`
		_prop=`_kstorequote "$_prop"`
		_val=`kstore get "$_key" "$_prop"`
		if [ $? -ne 0 ]; then
			echo "Current passphrase is incorrect?" >&2
			return 1
		fi
		_AUTH_SECRET=$_NEW_SECRET

		echo Updating: [$_key] [$_prop]
		kstore update "$_key" "$_val" "$_prop"
	done

	_kstoresecret-auto get
	if [ -n "$_AUTH_SECRET" ]; then
		_kstoresecret-auto del 2>&1 > /dev/null

		_AUTH_SECRET=$_NEW_SECRET
		_kstoresecret-auto set

		if [ $? -eq 0 ]; then
			echo "New passphrase saved in OS's keystore."
		fi
	fi

	_AUTH_SECRET=$_NEW_SECRET
}

function _kstoresecret-clear {
	unset _AUTH_SECRET
	_kstoresecret-auto del
}

function _kstoreupdate {
	if [ -z "$1" ]; then
		__func_head "[key] [value|file|-] [prop, default: $_KSTORE_DEF_PROP]"
		return 1
	fi
	_kstoreinit || return 1
	local _key _val _prop
	_key=`_kstorequote "$1"`
	_val=`_kstoreenc "$2"`
	_val=`_kstorequote "$_val"`
	_prop=`_kstorequote "${3:-$_KSTORE_DEF_PROP}"`
	_cond="key = '$_key' AND prop = '$_prop'"
	$_SQLITE "$_AUTH_DB" "UPDATE $_KSTORE_TABLE SET data = '$_val' WHERE $_cond;"
}

function _kstoreadd {
	if [ -z "$1" ]; then
		__func_head "[key] [value|file|-] [prop, default: $_KSTORE_DEF_PROP]"
		return 1
	fi
	_kstoreinit || return 1
	local _key _val _prop
	_key=`_kstorequote "$1"`
	_val=`_kstoreenc "$2"`
	_val=`_kstorequote "$_val"`
	_prop=`_kstorequote "${3:-$_KSTORE_DEF_PROP}"`
    $_SQLITE "$_AUTH_DB" \
		"INSERT INTO $_KSTORE_TABLE ( key, prop, data )
			VALUES( '$_key', '$_prop', '$_val' );"
}

function _kstoreget {
	if [ -z "$1" ]; then
		__func_head "[key] [prop, default: $_KSTORE_DEF_PROP]"
		return 1
	fi
	_kstoreinit || return 1
	local _key _prop _cond
	_key=`_kstorequote "$1"`
	_prop=`_kstorequote "${2:-$_KSTORE_DEF_PROP}"`
	_cond="key = '$_key' AND prop = '$_prop'"

    $_SQLITE "$_AUTH_DB" "SELECT 1111 FROM $_KSTORE_TABLE WHERE $_cond;" | grep -q 1111
	if [ $? -eq 0 ]; then
		$_SQLITE -list "$_AUTH_DB" "SELECT ( data ) FROM $_KSTORE_TABLE WHERE $_cond;" | _kstoredec
	else
		echo "\"$1\" not found (prop: $_prop)" >&2
		return 1
	fi
}

function _kstoredel {
	if [ -z "$1" ]; then
		__func_head "[key] [prop, default: $_KSTORE_DEF_PROP]"
		return 1
	fi
	_kstoreinit || return 1

	local _CONFIRM _key _prop _cond
	_key=`_kstorequote "$1"`
	_prop=`_kstorequote "${2:-$_KSTORE_DEF_PROP}"`
	_cond="key = '$_key' AND prop = '$_prop'"

    $_SQLITE "$_AUTH_DB" "SELECT 1111 FROM $_KSTORE_TABLE WHERE $_cond;" | grep -q 1111
	if [ $? -eq 0 ]; then
		$_SQLITE "$_AUTH_DB" "SELECT * FROM $_KSTORE_TABLE WHERE $_cond;"
		echo
		read -p "Delete this entry (yes/no)? " _CONFIRM
		if [ "$_CONFIRM" == "yes" ]; then
			$_SQLITE "$_AUTH_DB" "DELETE FROM $_KSTORE_TABLE WHERE $_cond;"
			if [ $? -eq 0 ]; then
				echo "deleted"
			fi
		else
			echo "action canceled"
		fi
	else
		echo "\"$1\" not found (prop: $_prop)" >&2
	fi
}

function _kstoredl-s3au {
	local p tmp _NAME

	p="https://git.k8s.astropenguin.net/penguin/s3-arch-utils/raw/branch/master"
	_CSUM=$1
	_NAME=$2

	tmp=$( mktemp )
	__download "$p/$_NAME" > $tmp
	sha256sum $tmp | grep -q "$_CSUM"
	if [ $? -eq 0 ]; then
		_NAME=$( basename "${_NAME//_/-}" .sh )
		mv $tmp "$RBASH_BIN/$_NAME"
		chmod +x "$RBASH_BIN/$_NAME"
		echo "> $RBASH_BIN/$_NAME"
	else
		echo "$_NAME: Signature mismatch"
		return 1
	fi
}

function _kstoredl-kstorecred {
	local p tmp _NAME

	_NAME="kstorecred"
	p="https://penguins-workspace.s3.ap-southeast-1.astropenguin.net/keystore/kstorecred.exe"
	_CSUM="031b4474b8eb8deafbb96df73b79f8b654fd3c2209f041fd34cb6f494791bcd4"

	tmp=$( mktemp )
	__download "$p" > $tmp
	sha256sum $tmp | grep -q "$_CSUM"
	if [ $? -eq 0 ]; then
		mv $tmp "$RBASH_BIN/$_NAME"
		chmod +x "$RBASH_BIN/$_NAME"
		echo "> $RBASH_BIN/$_NAME"
	else
		echo "$_NAME: Signature mismatch"
		return 1
	fi
}

function _kstoreinit-s3au {
	_kstoredl-s3au "574d106cdced150fa6e04a9437d356d8688035cb2c63a045fa0d4ead8b3ec941" "arch_delete_aws4.sh" || return 1
	_kstoredl-s3au "ce04b3f90b7d9a2578587c8ff841186810d977545943fb4a8234a6d6e9f7b568" "arch_delete_many_aws4.sh" || return 1
	_kstoredl-s3au "31709a639fab27b5ba071dd4c843fd3e90d4cea07bbb055c08c9720d31a8d11d" "arch_download_aws4.sh" || return 1
	_kstoredl-s3au "0bee6f925a41f496f66654062b49ea2a1cc55d877f4617d56bf91244aaf0be51" "arch_getacl_aws4.sh" || return 1
	_kstoredl-s3au "dcb89894e78351af702fabb521cf1cf6ca512db9cd4cf3c70631bb1e51ab9340" "arch_list_aws4.sh" || return 1
	_kstoredl-s3au "759ef3841525ce240d00e03578c39533c30bf246d61c12c2f3ba2ab37c5f814e" "arch_upload_aws4.sh" || return 1
}

function _kstoreupload-db {
	local _T _W

	_kstoreinit || return 1

	_T=$( date +%Y%m%d%H%M%S )
	echo $_T > "$RBASH_HOME/keystore.latest"

	which arch-upload-aws4 2>&1 > /dev/null
	if [ $? -ne 0 ]; then
		_kstoreinit-s3au
	fi

	_kstoreenc $_AUTH_DB > "$RBASH_HOME/$_T.enc"
	arch-upload-aws4 "keystore/$_T.enc" "$RBASH_HOME/$_T.enc"
	arch-upload-aws4 "keystore/latest" "$RBASH_HOME/keystore.latest"

	rm "$RBASH_HOME/$_T.enc"
	rm "$RBASH_HOME/keystore.latest"
}

function _kstoredownload-db {
	local _T _DOMAIN _URL _TMP _CONFIRM
	kstore secret config || return 1

	_DOMAIN="penguins-workspace.s3.ap-southeast-1.astropenguin.net"

	_T=$( __download "https://$_DOMAIN/keystore/latest" )
	if [ $? -ne 0 ]; then
		return 1
	fi

	_TMP=$( mktemp )
	__download "https://$_DOMAIN/keystore/$_T.enc" | _kstoredec > $_TMP
	if [ $? -ne 0 ]; then
		return 1
	fi

	_T=$( $_SQLITE "$_TMP" "SELECT COUNT( * ) FROM $_KSTORE_TABLE" )
	if [ $? -ne 0 ]; then
		return 1
	fi

	if [ -f "$_AUTH_DB" ]; then
		read -p "Replace existing db? (yes/no): " _CONFIRM
		if [ "$_CONFIRM" == "yes" ]; then
			_T="$_AUTH_DB.old.$( date +%Y%m%d%H%M%S )"
			mv "$_AUTH_DB" "$_T"
			mv $_TMP $_AUTH_DB
			echo "Original copy: $_T"
		else
			echo "action canceled"
			rm $_TMP
		fi
	else
		mv $_TMP $_AUTH_DB
	fi
}

function _kstoresearch {
	local _termk _termp _cond
	_termk=`_kstorequote "$1"`
	_termp=`_kstorequote "$2"`
	_cond="key LIKE '%$_termk%' AND prop LIKE '%$_termp%'"

	$_SQLITE -header -column "$_AUTH_DB" "SELECT key, prop, length( data ) FROM $_KSTORE_TABLE WHERE $_cond;"
}

function _kstorelist {
	$_SQLITE -header -column "$_AUTH_DB" "SELECT key, prop, length( data ) FROM $_KSTORE_TABLE;"
}

function _kstorequery {
	$_SQLITE "$_AUTH_DB" "$@"
}