GetPublicKeys.php
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GetPublicKeys.php
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	<?php

	/**
	* Zemke-Rhyne
	* Support tools for a Docker <--> Phabricator bridge
	*
	* (c) Sébastien Santoro aka Dereckson, 2014
	* Released under BSD license.
	*/

	require 'ConduitPassphraseQueryRequest.php';

	/**
	* Class GetPublicKeys
	*
	* Allows to get public keys allowed to connect to the account
	*/
	class GetPublicKeys {
	///
	/// Constant and helper methods to retrieves filename paths
	///

	/**
	* The directory where data is stored
	*
	* @const string
	*/
	const DATA_DIRECTORY = 'data';

	/**
	* Gets the path to the servers data file
	*
	* @return string The path to the servers data file
	*/
	public static function getServersDataFile () {
	return self::getDataFile('servers.json');
	}

	/**
	* Gets the path to the specified data file
	*
	* @param string $filename The file name to get the path of
	* @return string The path to the data file
	*/
	public static function getDataFile ($filename) {
	return getenv("HOME")
	. '/' . self::DATA_DIRECTORY
	. '/' . $filename;
	}

	///
	/// SSH authorized_keys helper methods
	///

	/**
	* Gets SSH public key from DevCentral
	*
	* @param int $id The id to the credential stored in passphrase
	* @return string The SSH public key
	*/
	public static function getPublicKey ($id) {
	//Calls conduit with a passphrase.query request
	$request = new ConduitPassphraseQueryRequest(
	[$id], true, false
	);
	$reply = $request
	->query()
	->getReply();

	//Gets the first property of the response.data object,
	//then the material.publicKey property
	$data = (Array)$reply->response->data;
	$firstDataItem = array_shift($data);

	$key = $firstDataItem->material->publicKey;
	return trim($key);
	}

	/**
	* Gets a .ssh/authorized_keys line to give access to the specified server
	*
	* @param object $server The server to give access to
	* @return string The line to add in authorized_keys file to give access to this server
	*
	* The expected object has the following properties:
	* - int key: the id of the SSH key to fetch from DevCentral
	* - array allowedConnectionFrom: an array of the hosts masks to allow to connect, each item a string (mandatory)
	* - string\|null restrictCommand: if not null, restrict the connection to a single command, automatically executed
	* - string comment: the SSH key comment
	*/
	public static function getAuthorizedKey ($server) {
	$line = "";

	//Options
	if ($server->restrictCommand !== null) {
	$line .= self::getAuthorizedKeyCommandOption($server->restrictCommand);
	$line .= ',';
	}
	$line .= self::getAuthorizedKeyFrom($server->allowedConnectionFrom);
	$line .= ',';
	$line .= self::getAuthorizedKeyRestrictOptions();
	$line .= ' ';

	//Key
	$line .= self::getPublicKey($server->key);
	$line .= ' ';
	$line .= $server->comment;

	return $line;
	}

	/**
	* Gets command authorized_keys option
	*
	* @param string The command to execute on login
	* @return string The command option
	*/
	public static function getAuthorizedKeyCommandOption ($command) {
	return 'command="' . $command . '"';
	}

	/**
	* Gets restriction authorized_keys options
	*
	* @return string A list of options restricting access
	*/
	public static function getAuthorizedKeyRestrictOptions () {
	return "no-port-forwarding,no-x11-forwarding,no-agent-forwarding";
	}

	/**
	* Gets authorized_keys from expression
	*
	* @param array $patterns a list of pattern matching the authorized_keys from format
	* @return string the from authorized_keys expression
	*/
	public static function getAuthorizedKeyFrom ($patterns) {
	return "from=\""
	. implode(',', $patterns)
	. '"';
	}

	/**
	* Prints a .ssh/authorized_keys file to give access to the specified servers
	*
	* @param array $servers The list of the servers needing to access this account
	*/
	public static function printAuthorizedKeys ($servers) {
	foreach ($servers as $server) {
	echo self::getAuthorizedKey($server);
	echo "\n";
	}
	}

	///
	/// Script procedural code
	///

	/**
	* Runs the script
	*/
	public static function run () {
	$file = self::getServersDataFile();
	$data = json_decode(file_get_contents($file));
	self::printAuthorizedKeys($data);
	}
	}

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