32
import simplejson as json
32
36
import ivle.console
34
from ivle.webapp.base.rest import JSONRESTView, named_operation
38
from ivle.webapp.base.rest import JSONRESTView, write_operation
35
39
from ivle.webapp.errors import BadRequest
37
41
# XXX: Should be RPC view, with actions in URL?
38
42
class ConsoleServiceRESTView(JSONRESTView):
39
43
'''An RPC interface to a Python console.'''
40
def get_permissions(self, user):
44
def get_permissions(self, user, config):
41
45
if user is not None:
42
46
return set(['use'])
46
@named_operation('use')
50
@write_operation('use')
47
51
def start(self, req, cwd=''):
48
52
working_dir = os.path.join("/home", req.user.login, cwd)
53
55
jail_path = os.path.join(req.config['paths']['jails']['mounts'],
55
cons = ivle.console.Console(uid, jail_path, working_dir)
57
cons = ivle.console.Console(req.config, req.user, jail_path,
57
60
# Assemble the key and return it. Yes, it is double-encoded.
58
return {'key': cjson.encode({"host": cons.host,
60
"magic": cons.magic}).encode('hex')}
61
return {'key': json.dumps({"host": cons.host,
63
"magic": cons.magic}).encode('hex')}
62
@named_operation('use')
63
def chat(self, req, key, text='', kind="chat"):
65
@write_operation('use')
66
def chat(self, req, key, text='', cwd='', kind="chat"):
64
67
# The request *should* have the following four fields:
65
68
# key: Hex JSON dict of host and port where the console server lives,
66
69
# and the secret to use to digitally sign the communication with the
79
82
jail_path = os.path.join(req.config['paths']['jails']['mounts'],
81
working_dir = os.path.join("/home", req.user.login) # Within jail
85
working_dir = os.path.join("/home", req.user.login, cwd)
87
# XXX: JSONRESTView should do this for us.
88
text = text.decode('utf-8')
84
90
msg = {'cmd':kind, 'text':text}
86
json_response = ivle.chat.chat(host, port, msg, magic,decode=False)
88
# Snoop the response from python-console to check that it's valid
90
response = cjson.decode(json_response)
91
except cjson.DecodeError:
93
json_response = ivle.chat.chat(host, port, msg, magic,decode=False)
94
# Snoop the response from python-console to check that it's valid
95
response = json.loads(json_response)
96
except (ValueError, ivle.chat.ProtocolError):
92
97
# Could not decode the reply from the python-console server
93
98
response = {"terminate":
94
"Communication to console process lost"}
95
100
if "terminate" in response:
96
response = restart_console(uid, jail_path, working_dir,
97
response["terminate"])
101
response = restart_console(req.config, req.user, jail_path,
102
working_dir, response["terminate"])
98
103
except socket.error, (enumber, estring):
99
104
if enumber == errno.ECONNREFUSED:
100
105
# Timeout: Restart the session
101
response = restart_console(uid, jail_path, working_dir,
102
"The IVLE console has timed out due to inactivity")
106
response = restart_console(req.config, req.user, jail_path,
108
"Timed out due to inactivity")
103
109
elif enumber == errno.ECONNRESET:
104
110
# Communication issue: Restart the session
105
response = restart_console(uid, jail_path, working_dir,
106
"Connection with the console has been reset")
111
response = restart_console(req.config, req.user, jail_path,
108
115
# Some other error - probably serious
109
116
raise socket.error, (enumber, estring)
113
def restart_console(uid, jail_path, working_dir, reason):
120
def restart_console(config, user, jail_path, working_dir, reason):
114
121
"""Tells the client that it must be issued a new console since the old
115
122
console is no longer availible. The client must accept the new key.
116
123
Returns the JSON response to be given to the client.
118
125
# Start a new console server console
119
cons = ivle.console.Console(uid, jail_path, working_dir)
126
cons = ivle.console.Console(config, user, jail_path, working_dir)
121
128
# Make a JSON object to tell the browser to restart its console client
122
new_key = cjson.encode(
129
new_key = json.dumps(
123
130
{"host": cons.host, "port": cons.port, "magic": cons.magic})
125
132
return {"restart": reason, "key": new_key.encode("hex")}