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minerva.js
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minerva.js
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'use strict';
var q = require('q');
var _ = require('lodash');
var CONSTANTS = require('./lib/CONSTANTS.js');
var Request = require('./lib/request-util');
var Parser = require('./lib/parser');
var utils = require('./lib/utils');
function login(user) {
var deferred = q.defer();
var url = CONSTANTS.URLS.login;
var jar = Request.jar('TESTID=set'); // required for login.
var form = {
sid: user.username,
PIN: user.password
};
function retry(jar, retry_count) {
retry_count = retry_count;
return Request.post(url, jar, form)
.then(function (response) {
var cookie_string = response.jar.getCookieString(CONSTANTS.BASE_URL + '/');
var contains_sessid = cookie_string.indexOf('SESSID=') !== -1;
if (contains_sessid) {
deferred.resolve(response);
} else {
if (retry_count < CONSTANTS.MAX_RETRY_COUNT) {
retry(response.jar, retry_count + 1);
} else {
deferred.reject(new Error('could not login'));
}
}
});
}
retry(jar, 1);
return deferred.promise;
}
function promiseTranscript() {
return function (response) {
var deferred = q.defer();
var url = CONSTANTS.URLS.transcript;
var jar = response.jar;
Request.get(url, jar)
.then(function (response) {
if (utils.isLoggedIn(response.body)) {
deferred.resolve(response);
} else {
deferred.reject(new Error('got 404'));
}
});
return deferred.promise;
};
}
function promiseCourses(selection) {
return function (response) {
// this is a hack cause I have no clue what the fuck is going on with
// McGill's post data on that form. Somehow they duplicate keys, put dummy
// somewhere, some random %25s, ... I'm not sure but I think I have to
// write the damn thing by hand and in order. sooo... This is my not so
// elegant solution but it works and I'm happy :) If you can refactor it,
// feel free :)
function formUrlEncode(options) {
// options keys : dep, number, season, year
var season = utils.fmtSeason(options.season);
var request_body = [
"term_in=" + (options.year || '2019') + season,
"&sel_subj=dummy",
"&sel_subj=" + (options.dep || 'COMP').toUpperCase(),
"&SEL_CRSE=" + (options.number || ''),
"&SEL_TITLE=",
"&BEGIN_HH=0",
"&BEGIN_MI=0",
"&BEGIN_AP=a",
"&SEL_DAY=dummy",
"&SEL_PTRM=dummy",
"&END_HH=0",
"&END_MI=0",
"&END_AP=a",
"&SEL_CAMP=dummy",
"&SEL_SCHD=dummy",
"&SEL_SESS=dummy",
"&SEL_INSTR=dummy",
"&SEL_INSTR=%25",
"&SEL_ATTR=dummy",
"&SEL_ATTR=%25",
"&SEL_LEVL=dummy",
"&SEL_LEVL=%25",
"&SEL_INSM=dummy",
"&sel_dunt_code=",
"&sel_dunt_unit=",
"&call_value_in=",
"&rsts=dummy",
"&crn=dummy",
"&path=1",
"&SUB_BTN=View+Sections"
].join('');
return request_body;
}
var deferred = q.defer();
var url = CONSTANTS.URLS.select_courses;
var jar = response.jar;
var form = formUrlEncode(selection || {});
Request.post(url, jar, form)
.then(
// success callback
function (response) {
if (utils.isLoggedIn(response.body)) {
deferred.resolve(response);
} else {
deferred.reject(new Error('couldnt resolve course selection'));
}
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
};
}
function promiseRegisteredCourses(options) {
return function (response) {
var deferred = q.defer();
var url = CONSTANTS.URLS.registered_courses;
var jar = response.jar;
var form = {
term_in: (options.year || '2015') + utils.fmtSeason(options.season)
};
Request.post(url, jar, form)
.then(
// success callback
function (response) {
if (utils.isLoggedIn(response.body)) {
deferred.resolve(response);
} else {
deferred.reject(new Error('couldnt get list of registered_courses'));
}
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
};
}
function promiseAddOrDropCourse(drop_flag, selection) {
return function (response) {
// I appologize for the mess below. It has to be like this because
// McGill programmers, somehow, tought it was a good idea to
// include duplicate keys in their POST requests. You read me
// well. Duplicate keys. In a POST request...
function formUrlEncode(options) {
// options keys : dep, number, season, year
// season matches WSF for winter summer fall
var season = utils.fmtSeason(options.season);
var head = [
"term_in=" + (options.year || '2015') + season,
// these are necessary otherwise post doesnt work... (wtf)
"&RSTS_IN=DUMMY",
"&assoc_term_in=DUMMY",
"&CRN_IN=DUMMY",
"&start_date_in=DUMMY",
"&end_date_in=DUMMY",
"&SUBJ=DUMMY",
"&CRSE=DUMMY",
"&SEC=DUMMY",
"&LEVL=DUMMY",
"&CRED=DUMMY",
"&GMOD=DUMMY",
"&TITLE=DUMMY",
"&MESG=DUMMY",
"®_BTN=DUMMY",
"&MESG=DUMMY",
].join('');
if (!(options.crn instanceof Array)) {
options.crn = [options.crn];
}
var request_body_for_adding = '',
request_body_for_dropping = '';
_.forEach(options.crn, function (crn) {
request_body_for_adding += [
"&RSTS_IN=RW",
"&CRN_IN=" + crn,
"&assoc_term_in=",
"&start_date_in=",
"&end_date_in=",
"®s_row=0", // for dropping make this 10, for adding, make this 0
].join('');
request_body_for_dropping += [
"&RSTS_IN=DW",
"&assoc_term_in=" + (options.year || '2015') + season,
"&CRN_IN=" + crn,
"&start_date_in=",
"&end_date_in=",
"®s_row=10", // for dropping make this 10, for adding, make this 0
].join('');
});
var tail = [
"&wait_row=0",
"&add_row=10",
"®_BTN=Submit+Changes",
].join('');
return [
head,
(drop_flag ? request_body_for_dropping : request_body_for_adding),
tail
].join('');
}
var deferred = q.defer();
var url = CONSTANTS.URLS.add_courses;
var jar = response.jar;
var form = formUrlEncode(selection || {});
Request.post(url, jar, form)
.then(
// success callback
function (response) {
if (utils.isLoggedIn(response.body)) {
deferred.resolve(response);
} else {
deferred.reject(new Error('Either couldnt login, or 404, or 400 bad request'));
}
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
};
}
function promiseAddCourses(selection) {
return promiseAddOrDropCourse(false, selection);
}
function promiseDropCourses(selection) {
return promiseAddOrDropCourse(true, selection);
}
var Minerva = function (u, p) {
this.username = u || process.env.MG_USER;
this.password = p || process.env.MG_PASS;
};
Minerva.prototype = {
// for testing and backward compatibility
login: function () {
return login(this);
},
getTranscript: function () {
var deferred = q.defer();
login(this)
.then(promiseTranscript())
.then(
// success callback
function (response) {
var html = response.body;
if (!utils.isLoggedIn(html)) {
deferred.reject(new Error('404'));
} else {
deferred.resolve(Parser.parseTranscript(html));
}
},
// failure callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
},
getCourses: function (selection) {
var deferred = q.defer();
login(this)
.then(promiseCourses(selection))
.then(
// success callback
function (response) {
deferred.resolve(Parser.parseCourses(response.body));
},
// failure callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
},
getRegisteredCourses: function (options) {
var deferred = q.defer();
login(this)
.then(promiseRegisteredCourses(options))
.then(
// success callback
function (response) {
deferred.resolve(Parser.parseRegisteredCourses(response.body));
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
},
addCourses: function (options) {
var deferred = q.defer();
login(this)
.then(promiseAddCourses(options))
.then(
// success callback
function (response) {
var courses = Parser.parseRegisteredCourses(response.body);
var error = _.find(courses, 'ErrorMsg');
if (error) {
deferred.reject(new Error(error.ErrorMsg));
} else {
deferred.resolve(courses);
}
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
},
dropCourses: function (options) {
var deferred = q.defer();
login(this)
.then(promiseDropCourses(options))
.then(
// success callback
function (response) {
var courses = Parser.parseRegisteredCourses(response.body);
var error = _.find(courses, 'ErrorMsg');
if (error) {
deferred.reject(new Error(error.ErrorMsg));
} else {
deferred.resolve(courses);
}
},
// error callback
function (err) {
deferred.reject(err);
});
return deferred.promise;
},
};
module.exports = Minerva;