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main.py
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main.py
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# -*- coding: utf-8 -*-
# @Date : 2016/9/9
# @Author : hrwhisper
import codecs
import json
import re
import os
import multiprocessing
from multiprocessing.dummy import Pool
from datetime import datetime
import urllib.parse
import requests
from bs4 import BeautifulSoup
from LoginUCAS import LoginUCAS
class UCASCourse(object):
def __init__(self, time_out=5, check_version=True):
self.__BEAUTIFULSOUPPARSE = 'html.parser' # or use 'lxml'
self.semester = None
self.save_base_path, self.semester = UCASCourse._read_info_from_file()
self.session = None
self.headers = None
self._init_session()
self.course_list = []
self.to_download = []
self.lock = multiprocessing.Lock()
self._time_out = time_out
self.version = '1.4'
self.check_version = check_version
def _check_version(self):
r = requests.get('https://api.github.com/repos/youqingxiaozhua/Ucas_course_ppt_auto_download/releases/latest')
github_latest = json.loads(r.text)
version = github_latest['name']
version_note = github_latest['body']
if version != self.version:
print('\nA new version (v%s: %s) have been released, please download from this link:' % (version, version_note))
print('https://github.com/youqingxiaozhua/Ucas_course_ppt_auto_download/releases\n')
def _init_session(self):
t = LoginUCAS().login_sep()
self.session = t.session
self.headers = t.headers
@classmethod
def _read_info_from_file(cls):
with codecs.open('./private.txt', "r", "utf-8") as f:
save_base_path = semester = None
for i, line in enumerate(f):
if i < 2: continue
if i == 2:
save_base_path = line.strip()
if i == 3:
semester = line.strip()
return save_base_path, semester
def _get_course_page(self):
# 从sep中获取Identity Key来登录课程系统，并获取课程信息
url = "http://sep.ucas.ac.cn/portal/site/16/801"
r = self.session.get(url, headers=self.headers)
url = re.findall(r'<meta http-equiv="refresh" content="0;url=([^"]*)">', r.text)[0]
self.headers['Host'] = "course.ucas.ac.cn"
html = self.session.get(url, headers=self.headers).text
return html
def _parse_course_list(self):
# 获取课程的所有URL
html = self._get_course_page()
self.course_list = ['https://course.ucas.ac.cn/portal/site/' + x for x in
re.findall(r'https://course.ucas.ac.cn/portal/site/([\d]+)"', html)]
def _get_all_resource_url(self):
# 从课程的所有URL中获取对应的所有课件
print('读取课件中......')
base_url = 'https://course.ucas.ac.cn/access/content/group/'
urls = [base_url + x.split('/')[-1] + '/' for x in self.course_list]
list(map(self._get_resource_url, urls))
def _get_resource_url(self, base_url, _path='', source_name=None):
html = self.session.get(base_url, headers=self.headers).text
tds = BeautifulSoup(html, self.__BEAUTIFULSOUPPARSE).find_all('li')
if not source_name:
source_name = BeautifulSoup(html, self.__BEAUTIFULSOUPPARSE).find('h3').text
if self.semester and source_name.find(self.semester) == -1: return # download only current semester
res = set()
for td in tds:
url = td.find('a')
if not url: continue
url = urllib.parse.unquote(url['href'])
if url == '../': continue
# if 'Folder' in td.text: # directory
if 'folder' in td.attrs['class']: # directory
# folder_name = td.text
self._get_resource_url(base_url + url, _path + '/' + url, source_name)
if url.startswith('http:__'): # Fix can't download when given a web link. eg: 计算机算法分析与设计
try:
res.add((self.session.get(base_url + url, headers=self.headers, timeout=self._time_out).url, _path))
except requests.exceptions.ReadTimeout:
print("Error-----------: ", base_url + url, "添加进下载路径失败,服务器长时间无响应")
except requests.exceptions.ConnectionError as e:
print("Error-----------: ", base_url + url, "添加进下载路径失败,服务器长时间无响应")
else:
res.add((base_url + url, _path))
for url, _path in res:
self.to_download.append((source_name, _path, url))
def _start_download(self):
# 多线程下载
p = Pool()
p.map(self._download_file, self.to_download)
p.close()
p.join()
def _download_file(self, param):
# 下载文件
dic_name, sub_directory, url = param
save_path = self.save_base_path + '/' + dic_name + '/' + sub_directory
with self.lock:
if not os.path.exists(save_path): # To create directory
os.makedirs(save_path)
filename = url.split('/')[-1]
save_path += '/' + filename
if not os.path.exists(save_path): # To prevent download exists files
try:
r = self.session.get(url, stream=True, timeout=self._time_out)
except requests.exceptions.ReadTimeout as e:
print('Error-----------文件下载失败,服务器长时间无响应: ', save_path)
except requests.exceptions.ConnectionError as e:
print('Error-----------文件下载失败,服务器长时间无响应: ', save_path)
try:
# HTML file does not have Content Length attr
size_mb = int(r.headers.get('Content-Length')) / (1024 ** 2)
except TypeError:
size_mb = 0.33 # html文件直接指定大小 :)
try:
# print('Start download {dic_name} >> {sub_directory}{filename} {size_mb:.2f}MB'.format(**locals()))
with open(save_path, 'wb') as f:
for chunk in r.iter_content(chunk_size=1024):
if chunk: # filter out keep-alive new chunks
f.write(chunk)
f.flush()
print('{dic_name} >> {sub_directory}{filename} Download success'.format(**locals()))
except UnicodeEncodeError:
print('{dic_name} >> {sub_directory} Download a file'.format(**locals()))
def start(self):
if self.check_version:
self._check_version()
self._parse_course_list()
self._get_all_resource_url()
self._start_download()
if __name__ == '__main__':
base_path = os.path.dirname(os.path.abspath(__file__))
os.chdir(base_path)
start = datetime.now()
s = UCASCourse()
s.start()
print('Task complete, total time:', datetime.now() - start)
os.system("pause")