added download images from javascript-driven websites script

Author: x4nth055

Diff for: web-scraping/download-images/README.md

@@ -24,3 +24,4 @@ To run this:
     python download_images https://www.thepythoncode.com/topic/web-scraping
     ```
     A new folder `www.thepythoncode.com` will be created automatically that contains all the images of that web page.
+- If you want to download images from javascript-driven websites, consider using `download_images_js.py` script instead (it accepts the same parameters)

Diff for: web-scraping/download-images/download_images_js.py

@@ -0,0 +1,99 @@
+from requests_html import HTMLSession
+import requests
+from tqdm import tqdm
+from bs4 import BeautifulSoup as bs
+from urllib.parse import urljoin, urlparse
+
+import os
+
+
+def is_valid(url):
+    """
+    Checks whether `url` is a valid URL.
+    """
+    parsed = urlparse(url)
+    return bool(parsed.netloc) and bool(parsed.scheme)
+
+
+def get_all_images(url):
+    """
+    Returns all image URLs on a single `url`
+    """
+    # initialize the session
+    session = HTMLSession()
+    # make the HTTP request and retrieve response
+    response = session.get(url)
+    # execute Javascript
+    response.html.render()
+    # construct the soup parser
+    soup = bs(response.html.html, "html.parser")
+    urls = []
+    for img in tqdm(soup.find_all("img"), "Extracting images"):
+        img_url = img.attrs.get("src") or img.attrs.get("data-src")
+        if not img_url:
+            # if img does not contain src attribute, just skip
+            continue
+        # make the URL absolute by joining domain with the URL that is just extracted
+        img_url = urljoin(url, img_url)
+        # remove URLs like '/hsts-pixel.gif?c=3.2.5'
+        try:
+            pos = img_url.index("?")
+            img_url = img_url[:pos]
+        except ValueError:
+            pass
+        # finally, if the url is valid
+        if is_valid(img_url):
+            urls.append(img_url)
+    return urls
+
+
+def download(url, pathname):
+    """
+    Downloads a file given an URL and puts it in the folder `pathname`
+    """
+    # if path doesn't exist, make that path dir
+    if not os.path.isdir(pathname):
+        os.makedirs(pathname)
+    # download the body of response by chunk, not immediately
+    response = requests.get(url, stream=True)
+
+    # get the total file size
+    file_size = int(response.headers.get("Content-Length", 0))
+
+    # get the file name
+    filename = os.path.join(pathname, url.split("/")[-1])
+
+    # progress bar, changing the unit to bytes instead of iteration (default by tqdm)
+    progress = tqdm(response.iter_content(1024), f"Downloading {filename}", total=file_size, unit="B", unit_scale=True, unit_divisor=1024)
+    with open(filename, "wb") as f:
+        for data in progress:
+            # write data read to the file
+            f.write(data)
+            # update the progress bar manually
+            progress.update(len(data))
+
+
+def main(url, path):
+    # get all images
+    imgs = get_all_images(url)
+    for img in imgs:
+        # for each img, download it
+        download(img, path)
+    
+
+
+if __name__ == "__main__":
+    import argparse
+    parser = argparse.ArgumentParser(description="This script downloads all images from a web page")
+    parser.add_argument("url", help="The URL of the web page you want to download images")
+    parser.add_argument("-p", "--path", help="The Directory you want to store your images, default is the domain of URL passed")
+    
+    args = parser.parse_args()
+    url = args.url
+    path = args.path
+
+    if not path:
+        # if path isn't specified, use the domain name of that url as the folder name
+        path = urlparse(url).netloc
+    
+    main(url, path)

Diff for: web-scraping/download-images/requirements.txt

@@ -1,3 +1,4 @@
 requests
+requests_html
 bs4
 tqdm