| import requests |
| from bs4 import BeautifulSoup |
| from urllib.parse import urljoin |
| from requests.exceptions import RequestException |
|
|
| PDF_HEADERS = { |
| "User-Agent": ( |
| "Mozilla/5.0 (Windows NT 10.0; Win64; x64) " |
| "AppleWebKit/537.36 (KHTML, like Gecko) " |
| "Chrome/121.0.0.0 Safari/537.36" |
| ), |
| "Accept": "application/pdf,application/octet-stream;q=0.9,*/*;q=0.8", |
| "Accept-Language": "en-US,en;q=0.9,ar;q=0.8", |
| "Referer": "https://www.google.com/", |
| } |
|
|
|
|
| def fetch_url(url: str): |
| try: |
| r = requests.get( |
| url, |
| timeout=20, |
| allow_redirects=True, |
| headers=PDF_HEADERS, |
| ) |
| r.raise_for_status() |
| ct = r.headers.get("Content-Type", "").lower() |
| return ct, r.content, r.url |
| except RequestException: |
| return None, None, None |
|
|
|
|
| def looks_like_pdf(content: bytes) -> bool: |
| return bool(content and content.startswith(b"%PDF")) |
|
|
|
|
| def get_pdf_bytes(source_url: str) -> bytes | None: |
| ct, content, final_url = fetch_url(source_url) |
|
|
| if not ct or not content: |
| return None |
|
|
| |
| |
| |
| if ( |
| "application/pdf" in ct |
| or final_url.lower().endswith(".pdf") |
| or looks_like_pdf(content) |
| ): |
| return content |
|
|
| |
| |
| |
| if "text/html" in ct: |
| try: |
| soup = BeautifulSoup( |
| content.decode("utf-8", errors="ignore"), |
| "html.parser", |
| ) |
|
|
| |
| for a in soup.find_all("a", href=True): |
| href = a["href"].strip() |
| if ".pdf" in href.lower(): |
| pdf_url = urljoin(final_url, href) |
| ct2, content2, _ = fetch_url(pdf_url) |
| if ct2 and ("application/pdf" in ct2 or looks_like_pdf(content2)): |
| return content2 |
|
|
| |
| for tag in soup.find_all(["iframe", "embed"], src=True): |
| src = tag["src"] |
| if ".pdf" in src.lower(): |
| pdf_url = urljoin(final_url, src) |
| ct2, content2, _ = fetch_url(pdf_url) |
| if ct2 and ("application/pdf" in ct2 or looks_like_pdf(content2)): |
| return content2 |
|
|
| except Exception: |
| return None |
|
|
| return None |
|
|
