mirror of
https://github.com/quatalog/quatalog.git
synced 2024-11-18 04:52:51 +00:00
328 lines
11 KiB
Python
328 lines
11 KiB
Python
import json
|
||
import html
|
||
import sys
|
||
import re
|
||
import os.path
|
||
from time import sleep
|
||
import random
|
||
from fake_useragent import UserAgent
|
||
from selenium import webdriver
|
||
from selenium.webdriver.common.by import By
|
||
from selenium.webdriver.support.ui import WebDriverWait
|
||
from selenium.webdriver.support import expected_conditions as EC
|
||
from selenium.common.exceptions import (
|
||
StaleElementReferenceException,
|
||
NoSuchElementException,
|
||
)
|
||
|
||
|
||
class IPBanException(Exception):
|
||
pass
|
||
|
||
|
||
# Fix course titles accounting for Roman numerals up to X
|
||
def normalize_title(input):
|
||
s = " ".join(input.split())
|
||
s = re.sub(r"[A-Za-z]+(['‘’][A-Za-z]+)?", lambda m: m.group(0).capitalize(), s)
|
||
s = re.sub(r"\b(Viii|Vii|Vi|Iv|Ix|Iii|Ii)\b", lambda a: a.group(0).upper(), s)
|
||
return s.strip()
|
||
|
||
|
||
# Waits until EC plus some random wait time
|
||
def wait(ec):
|
||
global driver
|
||
|
||
WebDriverWait(
|
||
driver, 35, ignored_exceptions=[StaleElementReferenceException]
|
||
).until(ec)
|
||
sleep(random.uniform(400, 1900) / 1000)
|
||
|
||
|
||
# jump_to_page: navigates to a paginated page on this insufferable website
|
||
#
|
||
# curr_page: the current page number
|
||
# to_page: the page number to jump to
|
||
# num_pages: the total number of pages
|
||
# postback_type: javascript:__doPostBack('<this field>','Page$3')
|
||
# pagination_type: <span id="<this field>">PAGE 1 OF 27<br></span>
|
||
def jump_to_page(curr_page, to_page, postback_type, pagination_type):
|
||
global driver
|
||
|
||
wait(EC.visibility_of_element_located((By.ID, postback_type)))
|
||
page = driver.find_element(By.ID, postback_type)
|
||
try:
|
||
num_pages = int(driver.find_element(By.ID, pagination_type).text.split()[-1])
|
||
except NoSuchElementException:
|
||
return 1, page
|
||
|
||
if to_page > num_pages or to_page < 1:
|
||
raise ValueError(
|
||
f"to_page was out of range ({to_page} not in [1, {num_pages}])"
|
||
)
|
||
while curr_page != to_page:
|
||
jumpable_pages = {
|
||
int(x.get_attribute("href").split("'")[3][5:]): x
|
||
for x in driver.find_elements(
|
||
By.CSS_SELECTOR,
|
||
"""a[href^="javascript:__doPostBack('"""
|
||
+ postback_type
|
||
+ """','Page$"]""",
|
||
)
|
||
}
|
||
curr_page = int(driver.find_element(By.ID, pagination_type).text.split()[-3])
|
||
if to_page in jumpable_pages:
|
||
jumpable_pages[to_page].click()
|
||
curr_page = to_page
|
||
elif to_page < min(jumpable_pages):
|
||
jumpable_pages[min(jumpable_pages)].click()
|
||
curr_page = min(jumpable_pages)
|
||
else:
|
||
jumpable_pages[max(jumpable_pages)].click()
|
||
curr_page = max(jumpable_pages)
|
||
|
||
wait(EC.staleness_of(page))
|
||
sleep(random.uniform(400, 1900) / 1000)
|
||
page = driver.find_element(By.ID, postback_type)
|
||
return curr_page, page
|
||
|
||
|
||
# scrape_page: Scrapes a page of institutions
|
||
#
|
||
# page_num: The page to scrape.
|
||
# Note that the current page before running this function must be 1.
|
||
def scrape_page(page_num):
|
||
global driver
|
||
global options
|
||
|
||
for i in range(1, 4):
|
||
try:
|
||
driver = webdriver.Firefox(options=options)
|
||
driver.get("https://ipinfo.io/ip")
|
||
print(
|
||
f'Trying with IP {driver.find_element(By.TAG_NAME, "body").text}',
|
||
file=sys.stderr,
|
||
)
|
||
driver.get(
|
||
"https://tes.collegesource.com/publicview/TES_publicview01.aspx?rid=f080a477-bff8-46df-a5b2-25e9affdd4ed&aid=27b576bb-cd07-4e57-84d0-37475fde70ce"
|
||
)
|
||
wait(EC.visibility_of_element_located((By.TAG_NAME, "body")))
|
||
print(f'Title: "{driver.title}"', file=sys.stderr)
|
||
if driver.title == "403 Forbidden":
|
||
raise IPBanException
|
||
jump_to_page(1, page_num, "gdvInstWithEQ", "lblInstWithEQPaginationInfo")
|
||
break
|
||
except IPBanException as e:
|
||
driver.quit()
|
||
print(f"We are IP-banned, exiting now", file=sys.stderr)
|
||
raise e
|
||
except Exception as e:
|
||
driver.quit()
|
||
|
||
print(
|
||
f"Attempt {i} failed due to {type(e).__name__}, retrying in 25 seconds...",
|
||
file=sys.stderr,
|
||
)
|
||
sleep(25)
|
||
else:
|
||
raise Exception(f"Failed to load the main page after 4 attempts, aborting.")
|
||
|
||
num_institutions = len(
|
||
driver.find_elements(
|
||
By.CSS_SELECTOR, "a[id^=gdvInstWithEQ_btnCreditFromInstName_]"
|
||
)
|
||
)
|
||
driver.quit()
|
||
|
||
print(f"Scraping page {page_num}, found {num_institutions} links", file=sys.stderr)
|
||
return [scrape_institution_safe(i, page_num) for i in range(0, num_institutions)]
|
||
|
||
|
||
def scrape_institution_safe(index, page_num):
|
||
for i in range(1, 4):
|
||
try:
|
||
return scrape_institution(index, page_num)
|
||
except Exception as e:
|
||
driver.quit()
|
||
print(
|
||
f"\tAttempt {i} failed due to {type(e).__name__}, retrying in 25 seconds...",
|
||
file=sys.stderr,
|
||
)
|
||
sleep(25)
|
||
else:
|
||
raise Exception(f"Failed to scrape {index} after 4 attempts, aborting.")
|
||
|
||
|
||
# scrape_institution: Scrapes an institution by index.
|
||
#
|
||
# index: the 0-indexed index of the instituion to scrape on the page we are on.
|
||
def scrape_institution(index, page_num):
|
||
global driver
|
||
global options
|
||
|
||
driver = webdriver.Firefox(options=options)
|
||
driver.get(
|
||
"https://tes.collegesource.com/publicview/TES_publicview01.aspx?rid=f080a477-bff8-46df-a5b2-25e9affdd4ed&aid=27b576bb-cd07-4e57-84d0-37475fde70ce"
|
||
)
|
||
jump_to_page(1, page_num, "gdvInstWithEQ", "lblInstWithEQPaginationInfo")
|
||
|
||
inst_link = driver.find_element(
|
||
By.ID, f"gdvInstWithEQ_btnCreditFromInstName_{index}"
|
||
)
|
||
[inst_name, inst_city, inst_state, _] = [
|
||
e.text
|
||
for e in inst_link.find_element(By.XPATH, "../..").find_elements(
|
||
By.TAG_NAME, "td"
|
||
)
|
||
]
|
||
inst_name, inst_city = normalize_title(inst_name), normalize_title(inst_city)
|
||
inst_link.click()
|
||
wait(EC.staleness_of(inst_link))
|
||
print(f"Scraping {inst_name} ({inst_city}, {inst_state})", file=sys.stderr)
|
||
|
||
# Add all courses
|
||
try:
|
||
num_pages = int(
|
||
driver.find_element(By.ID, "lblCourseEQPaginationInfo").text.split()[-1]
|
||
)
|
||
except NoSuchElementException:
|
||
num_pages = 1
|
||
|
||
try:
|
||
for i in range(1, num_pages + 1):
|
||
jump_to_page(max(1, i - 1), i, "gdvCourseEQ", "lblCourseEQPaginationInfo")
|
||
driver.find_element(By.ID, "gdvCourseEQ_cbxHeaderCheckAll").click()
|
||
except NoSuchElementException:
|
||
# Institution has no data
|
||
return {
|
||
"institution": inst_name,
|
||
"city": inst_city,
|
||
"state": inst_state,
|
||
"transfers": [],
|
||
}
|
||
|
||
# Open list
|
||
driver.find_element(By.ID, "btnAddToMyEQList").click()
|
||
wait(EC.visibility_of_element_located((By.ID, "gdvMyCourseEQList")))
|
||
|
||
# Scrape list
|
||
tds = driver.find_element(By.ID, "gdvMyCourseEQList").find_elements(
|
||
By.TAG_NAME, "td"
|
||
)
|
||
|
||
transfer_courses = [
|
||
{
|
||
"transfer": parse_course_td(transfer_course, True),
|
||
"rpi": parse_course_td(rpi_course, False),
|
||
"note": note.text.strip(),
|
||
"begin": begin.text.strip(),
|
||
"end": end.text.strip(),
|
||
}
|
||
for transfer_course, rpi_course, note, begin, end, _ in zip(
|
||
*[iter(x for x in tds)] * 6
|
||
)
|
||
]
|
||
|
||
driver.quit()
|
||
|
||
return {
|
||
"institution": inst_name,
|
||
"city": inst_city,
|
||
"state": inst_state,
|
||
"transfers": transfer_courses,
|
||
}
|
||
|
||
|
||
# Scrape course entries. We have a switch to disable including credit counts because the
|
||
# RPI-side credit counts are wrong most of the time and this is clarified in notes.
|
||
def parse_course_td(td, include_credits):
|
||
# This regex removes spaces next to parentheses. For example,
|
||
# Calculus II ( 04) -> Calculus II (04)
|
||
td_text = html.unescape(td.get_attribute("innerHTML")).strip().split("<br>")
|
||
courses_info = [
|
||
re.sub(
|
||
"(?<=[\[{(])\s+|\s+(?=[\]})])",
|
||
"",
|
||
x,
|
||
).split()
|
||
for x in td_text[: len(td_text) - 3]
|
||
]
|
||
|
||
return {
|
||
"catalog": td.find_element(By.TAG_NAME, "span").text.strip(),
|
||
"courses": [parse_one_course(x, include_credits) for x in courses_info],
|
||
}
|
||
|
||
|
||
def parse_one_course(course_info, include_credits):
|
||
# Not all schools use the same course code format, so this figures out how long
|
||
# it is if it exists. It will not exist for Not Transferrable and AP tests.
|
||
try:
|
||
course_id_delim = 1 + list(
|
||
bool(re.search(r"\d", s)) for s in course_info
|
||
).index(True)
|
||
except ValueError:
|
||
course_id_delim = 1
|
||
|
||
# Same deal with credit counts. Fancy logic here to avoid catching course titles
|
||
# with parentheses in them which do not have a credit count, this happened 3 times
|
||
# This also ignores credit counts with "Variable" in them, but ... you try
|
||
try:
|
||
if course_info[-1] == "()":
|
||
cr_delim = -1
|
||
else:
|
||
cr_delim = (
|
||
len(course_info)
|
||
- 1
|
||
- list(
|
||
bool(re.search(r"^\([.]*[0-9]", s.strip()))
|
||
for s in course_info[::-1]
|
||
).index(True)
|
||
)
|
||
assert bool(re.search(r"[0-9]\)", course_info[-1]))
|
||
except (ValueError, AssertionError):
|
||
cr_delim = len(course_info)
|
||
|
||
# note serves as a credit count override, since the RPI-side credit counts
|
||
# are inaccurate.
|
||
out = {
|
||
"id": " ".join(course_info[:course_id_delim]),
|
||
"name": normalize_title(" ".join(course_info[course_id_delim:cr_delim])),
|
||
}
|
||
if include_credits:
|
||
out.update({"credits": str(" ".join(course_info[cr_delim:])[1:-1]).strip()}),
|
||
return out
|
||
|
||
|
||
def main():
|
||
global driver
|
||
global options
|
||
|
||
if len(sys.argv) != 3:
|
||
print(
|
||
f"USAGE: python {sys.argv[0]} <page number to scrape> <output file>",
|
||
file=sys.stderr,
|
||
)
|
||
return 1
|
||
|
||
PAGE_NUM_TO_SCRAPE = int(sys.argv[1])
|
||
OUT_FILENAME = sys.argv[2]
|
||
|
||
print(f"Setting up selenium Firefox emulator", file=sys.stderr)
|
||
options = webdriver.FirefoxOptions()
|
||
options.add_argument("--headless")
|
||
|
||
user_agent = UserAgent().random
|
||
options.set_preference("general.useragent.override", user_agent)
|
||
print(f"Using randomized user agent {user_agent}", file=sys.stderr)
|
||
|
||
with open(OUT_FILENAME, "w") as transferjson:
|
||
json.dump(
|
||
scrape_page(PAGE_NUM_TO_SCRAPE), transferjson, sort_keys=True, indent=2
|
||
)
|
||
|
||
driver.quit()
|
||
|
||
|
||
if __name__ == "__main__":
|
||
exit(main())
|