finished

download

@@ -1 +1,29 @@
-#!/bin/env python3
+#!/bin/env fish
+
+if ! test -d venv
+  /bin/env python3 -m venv venv
+  . venv/bin/activate.fish
+  /bin/env python3 -m pip install -r requirements.txt
+  echo
+else
+  . venv/bin/activate.fish
+end
+
+if ! type -q curl
+  echo "curl is required to run this script"
+  exit
+end
+
+if ! type -q chromedriver || ! type -q chromium-browser
+  echo "both chromium-browser and chromedriver are required to run this script"
+  exit
+end
+
+if ! type -q ffmpeg
+  echo "ffmpeg is required to run this script"
+  exit
+end
+
+if ! /bin/env python3 download.py $argv
+  echo "download failed"
+end

download.py

@@ -0,0 +1,126 @@
+import os
+import shutil
+import tempfile
+import subprocess
+from time import sleep
+from argparse import ArgumentParser
+
+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
+
+
+STUDON_LOGIN_URL = 'https://www.studon.fau.de/studon/saml.php'
+
+
+def parse_args():
+    parser = ArgumentParser()
+    parser.add_argument('url', help='Interactive StudOn screencast url')
+    parser.add_argument('outfile', help='Destination file name without extension')
+    return parser.parse_args()
+
+
+def find_video_urls(url):
+    driver = webdriver.Chrome()
+    wait = WebDriverWait(driver, 10)
+
+    try:
+        driver.get(STUDON_LOGIN_URL)
+
+        while not driver.current_url.startswith('https://www.studon.fau.de'):
+            driver.implicitly_wait(1)
+
+        driver.get(url)
+
+        wait.until(EC.presence_of_element_located((By.TAG_NAME, 'iframe')))
+        iframe = driver.find_element(By.TAG_NAME, 'iframe')
+        driver.switch_to.frame(iframe)
+
+        video_selector = (
+            By.CSS_SELECTOR,
+            '.h5p-current video'
+        )
+
+        prev_button_selector = (
+            By.CSS_SELECTOR,
+            '.h5p-footer-previous-slide[role="button"]'
+        )
+
+        next_button_selector = (
+            By.CSS_SELECTOR,
+            '.h5p-footer-next-slide[role="button"]'
+        )
+
+        wait.until(EC.presence_of_element_located(prev_button_selector))
+        for i in range(100):
+            prev_button = driver.find_element(*prev_button_selector)
+            if prev_button.get_attribute('aria-disabled') == 'true':
+                break
+
+            prev_button.click()
+            sleep(0.1)
+
+        video_urls = []
+        for i in range(100):
+            wait.until(EC.presence_of_element_located(video_selector))
+            video = driver.find_element(*video_selector)
+            video_urls.append(video.get_attribute('src'))
+
+            next_button = driver.find_element(*next_button_selector)
+            if next_button.get_attribute('aria-disabled') == 'true':
+                print('breaking')
+                break
+
+            next_button.click()
+            sleep(0.25)
+
+        return video_urls
+
+    finally:
+        driver.quit()
+
+
+def download_and_merge_videos(urls, outfile):
+    temp_dir = tempfile.mkdtemp()
+
+    filenames = []
+
+    for idx, url in enumerate(urls):
+        ext = url.split('.')[-1]
+        filename = os.path.join(temp_dir, f'video_{idx}.{ext}')
+        filenames.append(filename)
+
+        status = subprocess.call(['curl', '-o', filename, url])
+        if status != 0:
+            return False
+
+    list_content = ''
+    for filename in filenames:
+        list_content += f"file '{filename}'\n"
+
+    list_path = os.path.join(temp_dir, 'list.txt')
+    with open(list_path, 'w') as f:
+        f.write(list_content)
+
+    ext = urls[0].split('.')[-1]
+    status = subprocess.call(['ffmpeg', '-f', 'concat', '-safe', '0',
+                              '-i', list_path, '-c', 'copy', outfile + '.' + ext])
+
+    shutil.rmtree(temp_dir, ignore_errors=True)
+
+    return status == 0
+
+
+def main():
+    args = parse_args()
+
+    urls = find_video_urls(args.url)
+    if not urls or len(urls) <= 0:
+        exit(1)
+
+    if not download_and_merge_videos(urls, args.outfile):
+        exit(1)
+
+
+main()

setup.fish

@@ -1,7 +0,0 @@
-/bin/env python3 -m venv venv
-. venv/bin/activate.fish
-python3 -m pip install -r requirements.txt
-
-echo
-echo "Usage: ./download <StudOn-Course-URL>"
-