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bbj/clients/nntp_client.py

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from urllib.error import URLError
import urllib.request as url
import nntplib
from hashlib import sha256
import time
import json
import ssl
import email.utils
from collections import namedtuple
class BBJNews(object):
# this module isnt exactly complete. The below description claims
# `all of its endpoints are mapped to native methods` though this
# is not yet true. The documentation for the API is not yet
# complete, and neither is this client. Currently this module is
# being adapted to fit the needs of the urwid client. As it evolves,
# and the rest of the project evolves, this client will be completed
# and well documented.
"""
A python implementation to the BBJ api: all of its endpoints are
mapped to native methods, it maps error responses to exceptions, and
it includes helper functions for several common patterns.
It should be noted that endpoints utilizing usermaps are returned as
tuples, where [0] is the value and [1] is the usermap dictionary.
Methods who do this will mention it in their documentation.
You can call them like `threads, usermap = bbj.thread_index()`
__init__ can take a host string and a port value (which can be
either int or str). It defaults to "127.0.0.1" and 7099, expanding
out to http://127.0.0.1:7099/.
Standard library exceptions are used, but several new attributes are
attached to them before raising: .code, .description, and .body.
code and description map the same values returned by the api. body
is the raw error object. Classes are mapped as follows:
0, 1, 2: ChildProcessError
3: ValueError
4: UserWarning
5: ConnectionRefusedError
attributes can be accessed as follows:
try:
response = bbj.endpoint():
except UserWarning as e:
assert e.code == 4
print(e.description)
# want the raw error object? thats weird, but whatever.
return e.body
See the offical API error documentation for more details.
"""
def __init__(self, host="127.0.0.1", port=119, https=False):
"""
Optionally takes port and host as kwargs. It will immediately
try to resolve a connection to the server, if its down, it
raises a URLError.
Important attributes:
.base is a string url for which all requests go to. It is
constructed on instantiation and the standalone host/port
are not stored.
.user_{name,auth} can be None, or strings of the username
and the authorization hash, respectively. When both values
are present (ie both resolve to True in a boolean context),
the request method sends this info with all its requests
and the user is effectively "logged in".
.send_auth, defaulting to True, determines whether to send
authorization information when it is available (see above).
If you set this to False, anonymous network usage is
guaranteed.
"""
self.host = host
self.port = port
self.tls = https
self.group = "tilde.team"
self.user_name = None
self.user_auth = None
self.send_auth = True
self.user = {
"user_id": "",
"user_name": "",
"is_admin": False,
"color": 0,
}
self.instance_info = {
"instance_name": "",
"allow_anon": True,
"admins": [],
}
self.connect()
#try:
# self.user = self("get_me")["data"]
# self.update_instance_info()
#except URLError:
# raise URLError("Cannot connect to %s (is the server down?)" % self.base[0:-2])
def __call__(self, *args, **kwargs):
"""
Calling the network object itself is exactly the same as calling
it's .request() method.
"""
return self.request(*args, **kwargs)
def _hash(self, string):
"""
Handy function to hash a password and return it.
"""
return sha256(bytes(string, "utf8")).hexdigest()
def connect(self):
self.conn = nntplib.NNTP(self.host, self.port)
if self.tls:
context = ssl.create_default_context()
self.conn.starttls(context)
# TODO: reconnect automatically
def request(self, endpoint, **params):
"""
Takes the string endpoint, and a variable number of kwargs
to pass into the request body. The parameters required will
vary by endpoint, and if they are wrong, ValueError will be
raised.
However, one kwarg is magical here: no_auth. If you include
this, its not sent with the request, it just disables the
sending of auth info when it is available (for more info,
read __init__'s documentation).
You don't have to use this method yourself, the other methods
must use this as a base though.
See raise_exception() for details on how this function reacts
to various failure conditions.
"""
headers = {"Content-Type": "application/json"}
if params.get("no_auth"):
params.pop("no_auth")
elif all([self.send_auth, self.user_name, self.user_auth]):
headers.update({"User": self.user_name, "Auth": self.user_auth})
data = bytes(json.dumps(params), "utf8")
request = url.Request(
self.base % endpoint,
data=data,
headers=headers)
try:
with url.urlopen(request) as _r:
response = _r.read()
except url.HTTPError as e:
response = e.file.read()
value = json.loads(str(response, "utf8"))
if value and value.get("error"):
self.raise_exception(value["error"])
return value
def raise_exception(self, error_object):
"""
Takes an API error object and raises the appropriate exception,
attaching the code and description to the object. The classes
are mapped to the codes as follows:
0, 1, 2: ChildProcessError (internal server, http, and json errors)
3: ValueError (invalid endpoint arguments)
4: UserWarning (illegal values provided by user, not a real "error")
5: ConnectionRefusedError (authorizations declined)
To capture a code and description in your client:
try:
response = bbj.endpoint():
except UserWarning as e:
assert e.code == 4
print(e.description)
# want the raw error object? thats weird, but whatever.
return e.body
"""
description = error_object["description"]
code = error_object["code"]
if code in [0, 1, 2]:
e = ChildProcessError(description)
elif code == 3:
e = ValueError(description)
elif code == 4:
e = UserWarning(description)
elif code == 5:
e = ConnectionRefusedError(description)
e.code, e.description, e.body = code, description, error_object
raise e
def update_instance_info(self):
"""
Stores configuration info for the connected BBJ server.
{
"instance_name": (string), // a title set by the server owner
"allow_anon": (bool), // whether anonymous participation is allowed
"admins": (list) // usernames of those who have admin rights on the server
}
"""
response = self("instance_info")
self.instance_info = response["data"]
# unsupported
def validate(self, key, value, exception=AssertionError):
"""
Uses the server's db_validate method to verify the validty
of `value` by `key`. If it is invalid, kwarg exception (default
AssertionError) is raised with the exception containing the
attribute .description as the server's reason. Exception can
be a False value to just return boolean False.
Examples:
# this will fail bacause the server wont allow newlines in usernames.
try:
bbj.validate("user_name", "des\nvox")
except AssertionError as e:
print(e.description)
# or you can handle it as a boolean like this:
is_okay = bbj.validate("title", "teacups and roses <3", exception=None)
"""
return True
def validate_all(self, keys_and_values, exception=AssertionError):
"""
Takes a single iterable object as its argument, containing
assertions to make, and applies `validate` to each pair.
See `validate` for full details. This method also takes
the kwarg `exception`, and passes it to validate.
Returns a list containing each response from validate. Under
successful circumstances, each element will be True. If you
specify exception=None, then the elements can contain false
as well.
Example:
values = [
("title", "the wea\nther sucks"),
("body", "rain is gross lmao")
]
try:
bbj.validate_all(values)
except AssertionError as e:
print(e.description)
# as booleans:
validated = bbj.validate_all(values, exception=None)
# => [False, True]
assert all(validated)
"""
return [
self.validate(key, value, exception) for key, value in keys_and_values
]
# AUTHINFO?
def set_credentials(self, user_name, user_auth, hash_auth=True, check_validity=True):
"""
Internalizes user_name and user_auth. Unless hash_auth=False is
specified, user_auth is assumed to be an unhashed password
string and it gets hashed with sha256. If you want to handle
hashing yourself, make sure to disable that.
Unless check_validity is set to false, the new credentials are
sent to the server and a ConnectionRefusedError is raised if
they do not match server authentication data. ValueError is
raised if the credentials contain illegal values, or the
specified user is not registered. If you need to differentiate
the two, using the method `user_is_registered` might be more
your speed.
On success, True is returned and the values are set. Subsequent
requests will now be authorized for the user (see request()'s
documentation for details on how to override this behavior
when necessary)
Examples:
try:
bbj.set_credentials("desvox", "i am sandvich")
except ConnectionRefusedError:
# bad auth info
except ValueError:
# paramter validation failed or the user is not registered
# you can handle hashing yourself if you want
password = input("Enter your password:")
bbj.set_credentials(
"desvox",
sha256(bytes(password, "utf8")).hexdigest(),
hash_auth=False
)
"""
self.conn.login(user_name, user_auth, usernetrc=False)
if check_validity and not self.validate_credentials(user_name, user_auth):
self.user_auth = self.user_name = None
raise ConnectionRefusedError("Auth and User do not match")
self.user_auth = user_auth
self.user_name = user_name
self.user = self("get_me")["data"]
return True
# unused
def validate_credentials(self, user_name, user_auth, exception=True):
"""
Pings the server to check that user_name can be authenticated with
user_auth. Raises ConnectionRefusedError if they cannot. Raises
ValueError if the credentials contain illegal values.
Alternatively, you can specify exception=False to just return a
boolean False if the credentials are incorrect. Will still raise
a ValueError if the parameters are illegal.
Example:
# this method DOES NOT take a password string. it must be hashed.
try: validate_credentials("desvox", hashed_password)
except ConnectionRefusedError:
...
except ValueError:
...
# as a boolean:
is_okay = bbj.validate_credentials("desvox", hashed_password, exception=False)
"""
self.validate_all([
("user_name", user_name),
("auth_hash", user_auth)
], ValueError)
try:
response = self("check_auth",
no_auth=True,
target_user=user_name,
target_hash=user_auth
)
return response["data"]
except ConnectionRefusedError as e:
if exception:
raise e
return False
# unsupported
def user_is_registered(self, user_name):
"""
Returns True or False whether user_name is registered
into the system.
"""
response = self(
"user_is_registered",
no_auth=True,
target_user=user_name
)
return response["data"]
# unsupported
def user_register(self, user_name, user_auth, hash_auth=True, set_as_user=True):
"""
Register user_name into the system with user_auth. Unless hash_auth
is set to false, user_auth should be a password string.
When set_as_user is True, the newly registered user is internalized
and subsequent uses of the object will be authorized for them.
Example:
try:
bbj.user_register("desvox", "sandvich")
except UserWarning as e:
# show this to users. always.
print(e.description)
# the object is now also set for this user...
assert bbj.get_me()["user_name"] == "desvox"
# ...unless you call it like this:
# bbj.user_register("desvox", "sandvich", set_as_user=False)
"""
if hash_auth:
user_auth = sha256(bytes(user_auth, "utf8")).hexdigest()
response = self("user_register",
no_auth=True,
user_name=user_name,
auth_hash=user_auth
)["data"]
assert all([
user_auth == response["auth_hash"],
user_name == response["user_name"]
])
if set_as_user:
self.set_credentials(user_name, user_auth, False)
return response
def user_update(self, **params):
"""
Update the user's data on the server. The new parameters
may be any of `user_name`, `auth_hash`, `quip`, `bio`,
`color`. On success, the newly updated user object is
returned and is also internalized as self.user.
"""
if params.get("user_name"):
self.user_name = params["user_name"]
if params.get("auth_hash"):
self.user_auth = params["auth_hash"]
self.user = dict(params)
return self.user
# unused
def user_get(self, user_id_or_name):
"""
Return a full user object by their id or username.
Note that this isn't required when using thread_load
or thread_index, because they return a usermap which
is a dictionary with keys of the ids connected to these
same objects. You shouldn't use this method when a usermap
is provided.
If the user element isnt found, ValueError is raised.
See also `user_is_registered`
"""
response = self("user_get", target_user=user_id_or_name)
return response["data"]
def thread_index(self, include_op=False):
"""
Returns a tuple where [0] is a list of all threads ordered by
most recently interacted, and [1] is a usermap object.
Example:
threads, usermap = bbj.thread_index()
for thread in threads:
author_id = thread["author"]
print(usermap[author_id]["user_name"])
"""
response, count, first, last, name = self.conn.group(self.group)
# overviews is a list of (article_number, overview) tuples,
# one for each article.
#
# Each overview is a dictionary containing at least:
#
# subject, from, date,
# message-id, references - article headers
# :bytes - the number of bytes in the article
# :lines - the number of lines in the body (deprecated)
response, overviews = self.conn.over((first, None))
if False:
# build up a map of message references
# we use a disjoint-set data structure
# to find the root of each message
threadmap = {}
rank = {}
for num, ov in overviews:
msgid = nntplib.decode_header(ov['message-id'])
# RFC5536 suggests that whitespace should not occur inside
# a message id, which (if true) makes it pretty easy to split
# the list of message ids in the references header
refs = nntplib.decode_header(ov['references']).split()
for r in refs:
threadmap[msgid] = r
rank[msgid] = 1
# TODO
else:
# make every message its own thread, for prototyping purposes
#t = {
# 'title': str,
# 'reply_count': int, # does this include the OP?
# 'pinned': bool,
# 'thread_id': uuid
# 'author': user_uuid,
# 'created': time,
# 'last_mod': time,
# 'last_author': user_uuid,
#}
threads = _overview_to_threads(overviews)
# make usermap
usermap = {}
for num, ov in overviews:
userid = nntplib.decode_header(ov['from'])
if userid in usermap:
continue
addr = _parse_single_address(userid)
usermap[userid] = {
'user_id': userid,
'user_name': addr.name,
'address': addr.address,
'color': colorhash(userid),
'is_admin': False, # TODO: LIST MODERATORS?
}
return threads, usermap
def thread_load(self, thread_id, format=None, op_only=False):
"""
Returns a tuple where [0] is a thread object and [1] is a usermap object.
Example:
thread, usermap = bbj.thread_load(some_id)
for message in thread["messages"]:
author_id = message["author"]
print(usermap[author_id]["user_name"])
print(message["body"])
"""
response = self("thread_load",
format=format, thread_id=thread_id, op_only=op_only)
return response["data"], response["usermap"]
def thread_create(self, title, body):
"""
Submit a new thread, and return its new object. Requires the
string arguments `title` and `body`. Title must be under
120 chars in length, else UserWarning is raised. Body must
also not be empty.
"""
response = self("thread_create", title=title, body=body)
return response["data"]
def thread_reply(self, thread_id, body):
"""
Submits a new reply to a thread and returns the new object.
Requires the thread's id and a non-empty body string.
"""
response = self("thread_reply", thread_id=thread_id, body=body)
return response["data"]
def fake_message(self, body="!!", format="sequential", author=None, post_id=0):
"""
Produce a a valid message object with `body`. Useful for
testing and can also be used mimic server messages in a
client.
"""
return {
"body": self.format_message(body, format),
"author": author or self.user["user_id"],
"post_id": post_id,
"created": time.time(),
"edited": False,
"send_raw": False,
"thread_id": "gibberish"
}
# unused
def format_message(self, body, format="sequential"):
"""
Send `body` to the server to be formatted according to `format`,
defaulting to the sequential parser. Returns the body object.
"""
response = self("format_message", body=body, format=format)
return response["data"]
# unsupported
def message_delete(self, thread_id, post_id):
"""
Delete message `post_id` from `thread_id`. The same rules apply
to deletions as they do for edits. The same exceptions are raised
with the same descriptions. If post_id is 0, this will also delete
the entire thread. Returns True on success.
"""
response = self("delete_post", thread_id=thread_id, post_id=post_id)
return response["data"]
# done
def edit_query(self, thread_id, post_id):
"""
Queries ther server database to see if a post can
be edited by the logged in user. thread_id and
post_id are required.
Returns a message object on success, or raises
a UserWarning describing why it failed.
"""
raise UserWarning("NNTP posts cannot be edited")
# done
def can_edit(self, thread_id, post_id):
"""
Return bool True/False that the post at thread_id | post_id
can be edited by the logged in user. Will not raise UserWarning.
"""
return False
# done
def edit_message(self, thread_id, post_id, new_body):
"""
Requires the thread_id and post_id. The edit flag is then
set on the message, new_body is set on the server, and the
newly edited message object is returned on success.
Will raise UserWarning if server editing rules are violated.
See also `can_edit` and `edit_query`
"""
raise UserWarning("NNTP posts cannot be edited")
# unused
def set_post_raw(self, thread_id, post_id, value):
"""
This is a subset of `edit_message` that retains the old
body and just sets its `send_raw` to your supplied `value`.
The `edited` parameter of the message on the server is not
modified.
"""
response = self(
"set_post_raw",
thread_id=thread_id,
post_id=post_id,
value=bool(value))
return response["data"]
# done
def user_is_admin(self, user_name_or_id):
"""
Return boolean True or False whether the given user identifier
is an admin on the server. Will raise ValueError if this user
is not registered.
"""
return False
# unsupported
def thread_set_pin(self, thread_id, new_status):
"""
Set whether a thread should be pinned or not. new_status
is evaluated as a boolean, and given that the logged in
user is an admin, the thread is set to this status on
the server, and the boolean is returned.
"""
return None
#raise NotImplementedError
# unused
def message_feed(self, time, format=None):
"""
Returns a special object representing all activity on the board since
the argument `time`, a unix/epoch timestamp.
{
"threads": {
"thread_id": {
...thread object
},
...more thread_id/object pairs
},
"messages": [...standard message object array sorted by date],
"usermap": {
...standard user_id mapping object
}
}
The message objects in "messages" are the same objects returned
in threads normally. They each have a thread_id parameter, and
you can access metadata for these threads by the "threads" object
which is also provided. All user_ids can be resolved into full user
objects from the usermap object.
The "messages" array is already sorted by submission time, newest
first. The order in the threads object is undefined and you should
instead use their `last_mod` attribute if you intend to list them
out visually.
the optional argument `format` can be given and bahaves the same
as `thread_load`.
"""
response = self("message_feed", time=time, format=format)
return {
"usermap": response["usermap"],
"threads": response["data"]["threads"],
"messages": response["data"]["messages"]
}
def _overview_to_threads(overviews):
threads = []
for num, ov in overviews:
try:
d = nntplib.decode_header(ov['date'])
d = email.utils.mktime_tz(email.utils.parsedate_tz(d))
t = {
'pinned': False,
'title': nntplib.decode_header(ov['subject']),
'reply_count': 1,
'thread_id': nntplib.decode_header(ov['message-id']),
'author': nntplib.decode_header(ov['from']),
'created': d,
'last_mod': d,
'last_author': nntplib.decode_header(ov['from']),
# nntp-specific fields
'news_id': num,
}
except ValueError:
continue
else:
threads.append(t)
return threads
def _test_overview_to_threads():
with open("overview.txt") as f:
lines = f.readlines()
fmt = ['subject', 'from', 'date', 'message-id', 'references', ':bytes', ':lines', 'xref']
overviews = nntplib._parse_overview(lines, fmt)
threads = _overview_to_threads(overviews)
for t in threads:
print(t)
Address = namedtuple('Address', 'name, address')
def _parse_single_address(value):
# the email.headerregistry api is truly bizarre
# and involves *constructing a class on the fly*
# to parse a simple value.
# there's a get_mailbox function that does exactly
# what we want but it's in the internal _header_value_parser
# module so we probably shoudn't use it.
name, addr = email.utils.parseaddr(value)
if name == '' and addr == '':
raise ValueError(value)
return Address(name, addr)
def colorhash(s):
h = hash(s)
return h % 7
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