examples/image-bot.js

#!/opt/node/bin/node

/*
	Copyright 2015-2018 Rivoreo

	Permission is hereby granted, free of charge, to any person obtaining
	a copy of this software and associated documentation files (the
	"Software"), to deal in the Software without restriction, including
	without limitation the rights to use, copy, modify, merge, publish,
	distribute, sublicense, and/or sell copies of the Software, and to
	permit persons to whom the Software is furnished to do so, subject to
	the following conditions:

	The above copyright notice and this permission notice shall be
	included in all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
	FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
	CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

// TODO: check host key of the server

const DEFAULT_PORT = 22;
const DEFAULT_USER_NAME = "sshout";

var fs = require("fs");
var util = require("util");
var sshout = require("sshout");
var ALGORITHMS = require("ssh2-streams").constants.ALGORITHMS;
var os = require("os");
var url = require("url");
var crypto = require("crypto");

var StringStartsWith = function(s, sub) {
	if(s.length < sub.length) return false;
	for(var i=0; i<sub.length; i++) {
		if(s[i] != sub[i]) return false;
	}
	return true;
};

var print_usage = function(name) {
	process.stderr.write(util.format("Usage: %s [-i <identify-file>] [-v] ssh://[<user-name>@]<sshout-server>[:<port>][/] <image-dir> <reply-url>\n", name));
};

var server_url = null;
var image_dir = null;
var reply_url = null;
//var identify_files = [];
var identify_file = null;
var verbose = 0;

for(var i=2; i<process.argv.length; i++) {
	if(process.argv[i][0] == "-") {
		var o = process.argv[i];
		for(var j=1; j<o.length; j++) switch(o[j]) {
			case "h":
				print_usage(process.argv[1]);
				process.exit(0);
				break;
			case "i":
				if(++i >= process.argv.length) fatal_option_require_argument("u");
				//identify_files.push(process.argv[i]);
				identify_file = process.argv[i];
				break;
			case "v":
				verbose++;
				break;
		}
	} else if(server_url === null) {
		//url = new URL(process.argv[i]);
		server_url = url.parse(process.argv[i], false, false);
		if(server_url.protocol !== "ssh:") {
			process.stderr.write("Protocol name in URL must be 'ssh'\n");
			process.exit(-1);
		}
	} else if(image_dir === null) {
		image_dir = process.argv[i];
		if(!fs.existsSync(image_dir)) fs.mkdirSync(image_dir, 0755);
	} else if(reply_url === null) {
		reply_url = process.argv[i];
		if(reply_url[reply_url.length - 1] === "/") reply_url = reply_url.substring(0, reply_url.length - 1);
	} else {
		process.stderr.write("Extra string after URL\n");
		process.exit(-1);
	}
}

if(server_url === null) {
	process.stderr.write("Need an SSH URL\n");
	print_usage(process.argv[1]);
	process.exit(-1);
}
if(image_dir === null) {
	process.stderr.write("Need image directory path\n");
	print_usage(process.argv[1]);
	process.exit(-1);
}
if(reply_url === null) {
	process.stderr.write("Need reply URL\n");
	print_usage(process.argv[1]);
	process.exit(-1);
}

var kex_list = ALGORITHMS.SUPPORTED_KEX;

var request_user_name = server_url.auth;
if(request_user_name === null) {
	request_user_name = DEFAULT_USER_NAME;
} else {
	var colon_i = request_user_name.indexOf(":");
	if(colon_i !== -1) request_user_name = request_user_name.substring(0, last_i);
}

var private_key = identify_file === null ? null : fs.readFileSync(identify_file);

var debug_print = verbose ? function(s) {
	if(verbose < 2 && StringStartsWith(s, "DEBUG: Parser: ")) return;
	process.stderr.write(s);
	process.stderr.write("\n");
} : null;

var sshout_client = new sshout.Client({
	algorithms:{ kex:kex_list },
	host:server_url.hostname,
	port:server_url.port ? server_url.port : DEFAULT_PORT,
	username:request_user_name,
	privateKey:private_key,
	tryKeyboard:true,	// Needed for public chatrooms
	keepaliveInterval:240000,
	debug:debug_print
});

var sshout_canoncal_user_name;

sshout_client.on("ready", function(canoncal_user_name) {
	sshout_canoncal_user_name = canoncal_user_name;
});
sshout_client.on("error", function(e, msg) {
	switch(typeof e) {
		case "number":
			process.stderr.write(util.format("SSHOUT error %d, %s\n", e, msg));
			break;
		case "object":
			console.error(e);
			break;
		default:
			process.stderr.wrtie(util.format("unknown type of error event (%s)\n", typeof e));
			break;
	}
});
sshout_client.on("message", function(o) {
	if(o.to_user === sshout_canoncal_user_name) return;
	if(o.message_type !== "image") return;
	var md5 = crypto.createHash("md5");
	md5.update(o.message);
	//var file_path = util.format("%s/%s.jpg", image_dir, md5.digest("hex"));
	var file_name = md5.digest("hex") + ".jpg";
	var file_path = image_dir + "/" + file_name;
	var reply_message = util.format("%s's image: %s/%s", o.from_user, reply_url, file_name);
	if(fs.existsSync(file_path)) sshout_client.send_message(o.to_user, "plain", reply_message);
	else fs.writeFile(file_path, o.message, { mode:0644, flag:"wx" }, function(e) {
		if(e) throw e;
		sshout_client.send_message(o.to_user, "plain", reply_message);
	});
});

sshout_client.start();