#!/usr/bin/env python
#
# gstfsd - WebVirtCloud daemon for managing VM's filesystem
#

import socketserver
import json
import guestfs
import re

PORT = 16510
ADDRESS = "0.0.0.0"


class MyTCPServer(socketserver.ThreadingTCPServer):
    allow_reuse_address = True


class MyTCPServerHandler(socketserver.BaseRequestHandler):
    def handle(self):
        # recive data
        d = self.request.recv(1024).strip()
        data = json.loads(d)

        # GuestFS
        gfs = guestfs.GuestFS(python_return_dict=True)
        try:
            gfs.add_domain(data['vname'])
            gfs.launch()
            parts = gfs.list_partitions()
            for part in parts:
                try:
                    gfs.mount(part, '/')
                    if gfs.is_file('/etc/shadow'):
                        if data['action'] == 'password':
                            file_shadow = gfs.cat('/etc/shadow')
                            new_root_hash = "root:" + data['passwd'] + ":"
                            file_shadow_new = re.sub('^root:.*?:', new_root_hash, file_shadow)
                            gfs.write('/etc/shadow', file_shadow_new)
                            gfs.chmod(640, '/etc/shadow')
                            self.request.sendall(json.dumps({'return': 'success'}))
                        if data['action'] == 'publickey':
                            if not gfs.is_dir('/root/.ssh'):
                                gfs.mkdir('/root/.ssh')
                                gfs.chmod(700, "/root/.ssh")
                            gfs.write('/root/.ssh/authorized_keys', data['key'])
                            gfs.chmod(600, '/root/.ssh/authorized_keys')
                            self.request.sendall(json.dumps({'return': 'success'}))
                    gfs.umount(part)
                except RuntimeError:
                    pass
            gfs.shutdown()
            gfs.close()
        except Exception as err:
            self.request.sendall(bytes(json.dumps({'return': 'error', 'message': str(err)}).encode()))


server = MyTCPServer((ADDRESS, PORT), MyTCPServerHandler)
server.serve_forever()