Classroom property (solves #382)

[faretek1]

There is currently no way, only using scratchattach, to get the associated classroom of student accounts. It appears that there is no JSON site-api for this (or maybe I am just ignorant), however it is possible to work this out by viewing the profile-details <p> tag in the profile page HTML.

This PR implements a site.user.User.classroom getter method using the @property decorator and a cache attribute. As users can never change what class they are in, this cache value will never need to change, solving #382

The implementation uses bs4 to get the `

` tag, and uses `soup.find_all("a")` and a RegEx for each href to detect which anchor refers to the classroom. The only possible other instance of an anchor tag being used in there is for becoming a scratcher, but I am not sure.

Note: The returned classroom object will only contain a classroom id and a classroom title (and a boolean if it is ended?)

todo:

• There should be a check for if a class is ended.

[faretek1]

I also moved around the imports within user.py to be structured nicer:

[faretek1]

This would not conflict with any existing code, and has been tested on 3 accounts:

import scratchattach as sa

u1 = sa.get_user("faretek1")
u2 = sa.get_user("l-_-o-_-i")
u3 = sa.get_user("tend-1")

print(u1.classroom)
print(u2.classroom)
print(u3.classroom)

console:

Warning: For methods that require authentication, use session.connect_user instead of get_user
Warning: For methods that require authentication, use session.connect_user instead of get_user
Warning: For methods that require authentication, use session.connect_user instead of get_user
None
classroom called 'FA'
classroom called 'tend'

Process finished with exit code 0

[faretek1]

Now checked that it works for detecting if a class is closed, and fixed a bug.

import scratchattach as sa

u1 = sa.get_user("faretek1")
u2 = sa.get_user("l-_-o-_-i")
u3 = sa.get_user("tend-1")

print(u1.classroom)
print(u2.classroom.__dict__)
print(u3.classroom.__dict__)

console:

Warning: For methods that require authentication, use session.connect_user instead of get_user
Warning: For methods that require authentication, use session.connect_user instead of get_user
Warning: For methods that require authentication, use session.connect_user instead of get_user
None
{'update_function': <function Requests.get at 0x0000028BEC823880>, 'update_API': 'https://api.scratch.mit.edu/classrooms/306224', '_session': <scratchattach.site.user.User object at 0x0000028BED3984C0>, 'id': '306224', 'classtoken': None, 'is_closed': False, 'title': 'FA', '_headers': {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36', 'x-csrftoken': 'a', 'x-requested-with': 'XMLHttpRequest', 'referer': 'https://scratch.mit.edu'}, '_cookies': {}, '_json_headers': {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36', 'x-csrftoken': 'a', 'x-requested-with': 'XMLHttpRequest', 'referer': 'https://scratch.mit.edu', 'accept': 'application/json', 'Content-Type': 'application/json'}}
{'update_function': <function Requests.get at 0x0000028BEC823880>, 'update_API': 'https://api.scratch.mit.edu/classrooms/1834118', '_session': <scratchattach.site.user.User object at 0x0000028BEBD7BF40>, 'id': '1834118', 'classtoken': None, 'is_closed': True, 'title': 'tend', '_headers': {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36', 'x-csrftoken': 'a', 'x-requested-with': 'XMLHttpRequest', 'referer': 'https://scratch.mit.edu'}, '_cookies': {}, '_json_headers': {'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36', 'x-csrftoken': 'a', 'x-requested-with': 'XMLHttpRequest', 'referer': 'https://scratch.mit.edu', 'accept': 'application/json', 'Content-Type': 'application/json'}}

Process finished with exit code 0