from src.exceptions import BBJException, BBJParameterError, BBJUserError from src import db, schema, formatting from functools import wraps from uuid import uuid1 from sys import argv import traceback import cherrypy import sqlite3 import json dbname = "data.sqlite" def api_method(function): """ A wrapper that handles encoding of objects and errors to a standard format for the API, resolves and authorizes users from header data, and prepares the arguments for each method. In the body of each api method and all the functions they utilize, BBJExceptions are caught and their attached schema is dispatched to the client. All other unhandled exceptions will throw a code 1 back at the client and log it for inspection. Errors related to JSON decoding are caught as well and returned to the client as code 0. """ function.exposed = True @wraps(function) def wrapper(self, *args, **kwargs): response = None try: connection = sqlite3.connect(dbname) # read in the body from the request to a string... if cherrypy.request.method == "POST": body = str(cherrypy.request.body.read(), "utf8") else: body = "" # the body may be empty, not all methods require input if body: body = json.loads(body) if isinstance(body, dict): # lowercase all of its top-level keys body = {key.lower(): value for key, value in body.items()} username = cherrypy.request.headers.get("User") auth = cherrypy.request.headers.get("Auth") if (username and not auth) or (auth and not username): raise BBJParameterError("User or Auth was given without the other.") elif not username and not auth: user = db.anon else: user = db.user_resolve(connection, username) if not user: raise BBJUserError("User %s is not registered" % username) elif auth != user["auth_hash"]: raise BBJException(5, "Invalid authorization key for user.") # api_methods may choose to bind a usermap into the thread_data # which will send it off with the response cherrypy.thread_data.usermap = {} value = function(self, body, connection, user) response = schema.response(value, cherrypy.thread_data.usermap) except BBJException as e: response = e.schema except json.JSONDecodeError as e: response = schema.error(0, str(e)) except Exception as e: error_id = uuid1().hex response = schema.error(1, "Internal server error: code {} {}" .format(error_id, repr(e))) with open("logs/exceptions/" + error_id, "a") as log: traceback.print_tb(e.__traceback__, file=log) log.write(repr(e)) print("logged code 1 exception " + error_id) finally: connection.close() return json.dumps(response) return wrapper def create_usermap(connection, obj, index=False): """ Creates a mapping of all the user_ids that occur in OBJ to their full user objects (names, profile info, etc). Can be a thread_index or a messages object from one. """ user_set = {item["author"] for item in obj} if index: [user_set.add(item["last_author"]) for item in obj] return { user_id: db.user_resolve( connection, user_id, externalize=True, return_false=False) for user_id in user_set } def validate(json, args): """ Ensure the json object contains all the keys needed to satisfy its endpoint (and isnt empty) """ if not json: raise BBJParameterError( "JSON input is empty. This method requires the following " "arguments: {}".format(", ".join(args))) for arg in args: if arg not in json.keys(): raise BBJParameterError( "Required parameter {} is absent from the request. " "This method requires the following arguments: {}" .format(arg, ", ".join(args))) class API(object): """ This object contains all the API endpoints for bbj. The html serving part of the server is not written yet, so this is currently the only module being served. """ @api_method def user_register(self, args, database, user, **kwargs): """ Register a new user into the system and return the new object. Requires the string arguments `user_name` and `auth_hash`. Do not send User/Auth headers with this method. """ validate(args, ["user_name", "auth_hash"]) return db.user_register( database, args["user_name"], args["auth_hash"]) @api_method def user_update(self, args, database, user, **kwargs): """ Receives new parameters and assigns them to the user_object in the database. The following new parameters can be supplied: `user_name`, `auth_hash`, `quip`, `bio`, and `color`. Any number of them may be supplied. The newly updated user object is returned on success. """ if user == db.anon: raise BBJParameterError("Anons cannot modify their account.") validate(args, []) # just make sure its not empty return db.user_update(database, user, args) @api_method def get_me(self, args, database, user, **kwargs): """ Requires no arguments. Returns your internal user object, including your authorization hash. """ return user @api_method def user_get(self, args, database, user, **kwargs): """ Retreive an external user object for the given `user`. Can be a user_id or user_name. """ validate(args, ["user"]) return db.user_resolve( database, args["user"], return_false=False, externalize=True) @api_method def user_is_registered(self, args, database, user, **kwargs): """ Takes the argument `target_user` and returns true or false whether they are in the system or not. """ validate(args, ["target_user"]) return bool(db.user_resolve(database, args["target_user"])) @api_method def check_auth(self, args, database, user, **kwargs): """ Takes the arguments `target_user` and `target_hash`, and returns boolean true or false whether the hash is valid. """ validate(args, ["target_user", "target_hash"]) user = db.user_resolve(database, args["target_user"], return_false=False) return args["target_hash"] == user["auth_hash"] @api_method def thread_index(self, args, database, user, **kwargs): """ Return an array with all the threads, ordered by most recent activity. Requires no arguments. """ threads = db.thread_index(database) cherrypy.thread_data.usermap = create_usermap(database, threads, True) return threads @api_method def message_feed(self, args, database, user, **kwargs): """ 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] } 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. 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. """ validate(args, ["time"]) return db.message_feed(database, args["time"]) @api_method def thread_create(self, args, database, user, **kwargs): """ Creates a new thread and returns it. Requires the non-empty string arguments `body` and `title`. If the argument `send_raw` is specified and has a non-nil value, the OP message will never recieve special formatting. """ validate(args, ["body", "title"]) thread = db.thread_create( database, user["user_id"], args["body"], args["title"], args.get("send_raw")) cherrypy.thread_data.usermap = \ create_usermap(database, thread["messages"]) return thread @api_method def thread_reply(self, args, database, user, **kwargs): """ Creates a new reply for the given thread and returns it. Requires the string arguments `thread_id` and `body` If the argument `send_raw` is specified and has a non-nil value, the message will never recieve special formatting. """ validate(args, ["thread_id", "body"]) return db.thread_reply( database, user["user_id"], args["thread_id"], args["body"], args.get("send_raw")) @api_method def thread_load(self, args, database, user, **kwargs): """ Returns the thread object with all of its messages loaded. Requires the argument `thread_id`. `format` may also be specified as a formatter to run the messages through. Currently only "sequential" is supported. """ validate(args, ["thread_id"]) thread = db.thread_get(database, args["thread_id"]) cherrypy.thread_data.usermap = \ create_usermap(database, thread["messages"]) if args.get("format") == "sequential": formatting.apply_formatting(thread["messages"], formatting.sequential_expressions) return thread @api_method def edit_post(self, args, database, user, **kwargs): """ Replace a post with a new body. Requires the arguments `thread_id`, `post_id`, and `body`. This method verifies that the user can edit a post before commiting the change, otherwise an error object is returned whose description should be shown to the user. To perform sanity checks and retrieve the unformatted body of a post without actually attempting to replace it, use `edit_query` first. Optionally you may also include the argument `send_raw` to set the message's formatting flag. However, if this is the only change you would like to make, you should use the endpoint `set_post_raw` instead. Returns the new message object. """ if user == db.anon: raise BBJUserError("Anons cannot edit messages.") validate(args, ["body", "thread_id", "post_id"]) return db.message_edit_commit( database, user["user_id"], args["thread_id"], args["post_id"], args["body"], args.get("send_raw")) @api_method def delete_post(self, args, database, user, **kwargs): """ Requires the arguments `thread_id` and `post_id`. Delete a message from a thread. The same rules apply here as `edit_post` and `edit_query`: the logged in user must either be the one who posted the message within 24hrs, or have admin rights. The same error descriptions and code are returned on falilure. Boolean true is returned on success. If the post_id is 0, the whole thread is deleted. """ if user == db.anon: raise BBJUserError("Anons cannot delete messages.") validate(args, ["thread_id", "post_id"]) return db.message_delete( database, user["user_id"], args["thread_id"], args["post_id"]) @api_method def set_post_raw(self, args, database, user, **kwargs): """ Requires the boolean argument of `value`, string argument `thread_id`, and integer argument `post_id`. `value`, when false, means that the message will be passed through message formatters before being sent to clients. When `value` is true, this means it will never go through formatters, all of its whitespace is sent to clients verbatim and expressions are not processed. The same rules for editing messages (see `edit_query`) apply here and the same error objects are returned for violations. You may optionally set this value as well when using `edit_post`, but if this is the only change you want to make to the message, using this endpoint instead is preferable. """ if user == db.anon: raise BBJUserError("Anons cannot edit messages.") validate(args, ["value", "thread_id", "post_id"]) return db.message_edit_commit( database, user["user_id"], args["thread_id"], args["post_id"], None, args["value"], None) @api_method def is_admin(self, args, database, user, **kwargs): """ Requires the argument `target_user`. Returns a boolean of whether that user is an admin. """ validate(args, ["target_user"]) user = db.user_resolve(database, args["target_user"], return_false=False) return user["is_admin"] @api_method def edit_query(self, args, database, user, **kwargs): """ Queries the database to ensure the user can edit a given message. Requires the arguments `thread_id` and `post_id` (does not require a new body) Returns the original message object without any formatting on success. Returns a descriptive code 4 otherwise. """ if user == db.anon: raise BBJUserError("Anons cannot edit messages.") validate(args, ["thread_id", "post_id"]) return db.message_edit_query( database, user["user_id"], args["thread_id"], args["post_id"]) @api_method def format_message(self, args, database, user, **kwargs): """ Requires the arguments `body` and `format`. Applies `format` to `body` and returns the new object. See `thread_load` for supported specifications for `format`. """ validate(args, ["format", "body"]) message = [{"body": args["body"]}] if args["format"] == "sequential": formatter = formatting.sequential_expressions else: raise BBJParameterError("invalid format directive.") formatting.apply_formatting(message, formatter) return message[0]["body"] @api_method def set_thread_pin(self, args, database, user, **kwargs): """ Requires the arguments `thread_id` and `value`. `value` must be a boolean of what the pinned status should be. This method requires that the caller is logged in and has admin status on their account. Returns the same boolean you supply as `value` """ validate(args, ["thread_id", "value"]) if not user["is_admin"]: raise BBJUserError("Only admins can set thread pins") return db.set_thread_pin(database, args["thread_id"], args["value"]) @api_method def db_validate(self, args, database, user, **kwargs): """ Requires the arguments `key` and `value`. Returns an object with information about the database sanity criteria for key. This can be used to validate user input in the client before trying to send it to the server. If the argument `error` is supplied with a non-nil value, the server will return a standard error object on failure instead of the special object described below. The returned object has two keys: { "bool": true/false, "description": null/"why this value is bad" } If bool == false, description is a string describing the problem. If bool == true, description is null and the provided value is safe to use. """ validate(args, ["key", "value"]) response = dict() try: db.validate([(args["key"], args["value"])]) response["bool"] = True response["description"] = None except BBJException as e: if args.get("error"): raise response["bool"] = False response["description"] = e.description return response def api_http_error(status, message, traceback, version): return json.dumps(schema.error(2, "HTTP error {}: {}".format(status, message))) CONFIG = { "/": { "error_page.default": api_http_error } } def run(): # user anonymity is achieved in the laziest possible way: a literal user # named anonymous. may god have mercy on my soul. _c = sqlite3.connect(dbname) try: db.anon = db.user_resolve(_c, "anonymous") if not db.anon: db.anon = db.user_register( _c, "anonymous", # this is the hash for "anon" "5430eeed859cad61d925097ec4f53246" "1ccf1ab6b9802b09a313be1478a4d614") finally: _c.close() cherrypy.quickstart(API(), "/api", CONFIG) if __name__ == "__main__": try: port_spec = argv.index("--port") port = argv[port_spec+1] except ValueError: # --port not specified port = 7099 except IndexError: # flag given but no value exit("thats not how this works, silly! --port 7099") cherrypy.config.update({'server.socket_port': int(port)}) run()