macproxy_classic/extensions/waybackmachine/waybackmachine.py at 1c04c2e9a40e673d9d992db930aaf65d3fd19c03 · rdmark/macproxy_classic · GitHub

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from flask import render_template_string
from urllib.parse import urlparse
import requests
from bs4 import BeautifulSoup
import datetime
import calendar
import re
import os
import time
from utils.debug_utils import debug_print

DOMAIN = "web.archive.org"
TARGET_DATE = "19960101"
date_update_message = ""
last_request_time = 0
REQUEST_DELAY = 0.2  # Minimum time between requests in seconds

USER_AGENT = (
    "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
    "AppleWebKit/537.36 (KHTML, like Gecko) "
    "Chrome/91.0.4472.114 Safari/537.36"
)

# Create a session object for persistent connections
session = requests.Session()
session.headers.update({"User-Agent": USER_AGENT})

HTML_TEMPLATE = """
<!DOCTYPE html>
<html>
<head>
    <title>WayBack Machine</title>
</head>
<body>
    <center>{% if not override_active %}<br>{% endif %}
        <font size="7"><h4>WayBack<br>Machine</h4></font>
        <form method="post">
            {% if override_active %}
                <select name="month">
                    {% for month in months %}
                        <option value="{{ month }}" {% if month == selected_month %}
                        selected{% endif %}>{{ month }}</option>
                    {% endfor %}
                </select>
                <select name="day">
                    {% for day in range(1, 32) %}
                        <option value="{{ day }}" {% if day == selected_day %}
                        selected{% endif %}>{{ day }}</option>
                    {% endfor %}
                </select>
                <select name="year">
                    {% for year in range(1996, current_year + 1) %}
                        <option value="{{ year }}" {% if year == selected_year %}
                        selected{% endif %}>{{ year }}</option>
                    {% endfor %}
                </select>
                <br>
                <input type="submit" name="action" value="set date">
                <input type="submit" name="action" value="disable">
            {% else %}
                <input type="submit" name="action" value="enable">
            {% endif %}
        </form>
        <p>
            {% if override_active %}
                <b>WayBack Machine enabled!</b>{% if date_update_message %}
                (date updated to <b>{{ date_update_message }}</b>){% endif %}<br>
                Enter a URL in the address bar, or click <b>disable</b> to quit.
            {% else %}
                WayBack Machine disabled.<br>
                Click <b>enable</b> to begin.
            {% endif %}
        </p>
    </center>
</body>
</html>
"""

override_active = False
current_date = datetime.datetime.now()
selected_month = current_date.strftime("%b").upper()
selected_day = current_date.day
selected_year = 1996
current_year = current_date.year
months = [
    "JAN",
    "FEB",
    "MAR",
    "APR",
    "MAY",
    "JUN",
    "JUL",
    "AUG",
    "SEP",
    "OCT",
    "NOV",
    "DEC",
]


def get_override_status():
    return override_active


def rate_limit_request():
    """Implement rate limiting between requests"""
    global last_request_time
    current_time = time.time()
    time_since_last_request = current_time - last_request_time
    if time_since_last_request < REQUEST_DELAY:
        time.sleep(REQUEST_DELAY - time_since_last_request)
    last_request_time = time.time()


def extract_timestamp_from_url(url):
    """Extract timestamp from a Wayback Machine URL"""
    match = re.search(r"/web/(\d{14})/", url)
    return match.group(1) if match else None


def construct_wayback_url(url, timestamp):
    """Construct a Wayback Machine URL with the given timestamp"""
    return f"https://web.archive.org/web/{timestamp}/{url}"


def find_closest_snapshot(url):
    """Use Wayback CDX API to find closest available snapshot"""
    try:
        cdx_url = "https://web.archive.org/cdx/search/cdx"
        params = {
            "url": url,
            "matchType": "prefix",
            "limit": -1,  # Get all results
            "from": TARGET_DATE,  # Start from our target date
            "output": "json",
            "sort": "closest",
            "filter": "!statuscode:[500 TO 599]",  # Exclude server errors
        }

        response = session.get(cdx_url, params=params, timeout=10)
        if response.status_code == 200:
            data = response.json()
            if len(data) > 1:  # First row is header
                # Sort snapshots to prefer earlier dates
                snapshots = data[1:]  # Skip header row
                target_timestamp = int(TARGET_DATE + "000000")

                # Sort by absolute difference from target date, but prefer later dates
                snapshots.sort(
                    key=lambda x: (
                        abs(
                            int(x[1]) - target_timestamp
                        ),  # Primary sort: absolute distance from target
                        -int(
                            x[1]
                        ),  # Secondary sort: reverse timestamp (prefer earlier dates)
                    )
                )

                for snapshot in snapshots:
                    timestamp = snapshot[1]
                    return timestamp

    except Exception as e:
        print(f"Error finding snapshot: {str(e)}")
    return TARGET_DATE + "000000"  # Return target date if no snapshot found


def make_archive_request(url, follow_redirects=True, original_timestamp=None):
    """Make a request to the archive with rate limiting and redirect handling"""
    rate_limit_request()

    try:
        # Simply use original_timestamp if provided, otherwise find closest snapshot
        timestamp_to_use = (
            original_timestamp if original_timestamp else find_closest_snapshot(url)
        )

        wayback_url = construct_wayback_url(url, timestamp_to_use)
        debug_print(f"Requesting: {wayback_url}")
        response = session.get(wayback_url, timeout=10)

        # Handle Wayback Machine redirects
        if response.status_code == 200 and follow_redirects:
            content = response.text

            # Check if this is a Wayback Machine redirect page
            if "Got an HTTP" in content and "Redirecting to..." in content:
                redirect_match = re.search(
                    r"Redirecting to\.\.\.\s*\n\s*(.*?)\s*$", content, re.MULTILINE
                )
                if redirect_match:
                    redirect_url = redirect_match.group(1).strip()
                    debug_print(f"Following Wayback redirect to: {redirect_url}")

                    # Make a new request to the redirect URL, maintaining original timestamp
                    return make_archive_request(
                        redirect_url,
                        follow_redirects=True,
                        original_timestamp=timestamp_to_use,
                    )

            # Also check for JavaScript redirects
            if "window.location.replace" in content:
                redirect_match = re.search(
                    r'window\.location\.replace\(["\'](.+?)["\']\)', content
                )
                if redirect_match:
                    redirect_url = redirect_match.group(1).strip()
                    debug_print(f"Following JS redirect to: {redirect_url}")

                    # Make a new request to the redirect URL, maintaining original timestamp
                    return make_archive_request(
                        redirect_url,
                        follow_redirects=True,
                        original_timestamp=timestamp_to_use,
                    )

        return response

    except Exception as e:
        print(f"Request failed: {str(e)}")
        raise


def extract_original_url(url, base_url):
    """Extract original URL from Wayback Machine URL format"""
    try:
        if "_static/" in url:
            return None

        # If it's already a full URL without web.archive.org, return it
        parsed_url = urlparse(url)
        if parsed_url.scheme and parsed_url.netloc and DOMAIN not in parsed_url.netloc:
            return url

        # Get the base domain from the base_url
        base_match = re.search(
            r"/web/\d{14}(?:im_|js_|cs_|fw_|oe_)?/(?:https?://)?([^/]+)/?", base_url
        )
        base_domain = base_match.group(1) if base_match else None

        # If the URL contains a Wayback Machine timestamp pattern
        timestamp_pattern = r"/web/\d{14}(?:im_|js_|cs_|fw_|oe_)?/"
        if re.search(timestamp_pattern, url):
            match = re.search(
                r"/web/\d{14}(?:im_|js_|cs_|fw_|oe_)?/(?:https?://)?(.+)", url
            )
            if match:
                actual_url = match.group(1)
                return (
                    f"http://{actual_url}"
                    if not actual_url.startswith(("http://", "https://"))
                    else actual_url
                )

        # Handle relative URLs
        if not url.startswith(("http://", "https://")):
            if url.startswith("//"):
                return f"http:{url}"
            elif url.startswith("/"):
                # Use the base domain if we found one
                if base_domain:
                    return f"http://{base_domain}{url}"
            else:
                if base_domain:
                    # Handle relative paths without leading slash
                    base_path = os.path.dirname(parsed_url.path)
                    if base_path and base_path != "/":
                        return f"http://{base_domain}{base_path}/{url}"
                    else:
                        return f"http://{base_domain}/{url}"

        return url
    except Exception as e:
        print(f"Error in extract_original_url: {url} - {str(e)}")
        return url


def process_html_content(content, base_url):
    try:
        soup = BeautifulSoup(content, "html.parser")

        # Remove Wayback Machine's injected elements
        for element in soup.select(
            'script[src*="/_static/"], script[src*="archive.org"], \
                                 link[href*="/_static/"], div[id*="wm-"], div[class*="wm-"], \
                                 style[id*="wm-"], div[id*="donato"], div[id*="playback"]'
        ):
            element.decompose()

        # Process regular URL attributes
        url_attributes = ["href", "src", "background", "data", "poster", "action"]

        # URL pattern for CSS url() functions
        url_pattern = r'url\([\'"]?(\/web\/\d{14}(?:im_|js_|cs_|fw_)?\/(?:https?:\/\/)?[^)]+)[\'"]?\)'

        for tag in soup.find_all():
            # Handle regular attributes
            for attr in url_attributes:
                if tag.has_attr(attr):
                    original_url = tag[attr]
                    new_url = extract_original_url(original_url, base_url)
                    if new_url:
                        tag[attr] = new_url
                    else:
                        del tag[attr]

            # Handle inline styles
            if tag.has_attr("style"):
                style_content = tag["style"]
                tag["style"] = re.sub(
                    url_pattern,
                    lambda m: f'url("{extract_original_url(m.group(1), base_url)}")',
                    style_content,
                )

        # Process <style> tags
        for style_tag in soup.find_all("style"):
            if style_tag.string:
                style_tag.string = re.sub(
                    url_pattern,
                    lambda m: f'url("{extract_original_url(m.group(1), base_url)}")',
                    style_tag.string,
                )

        return str(soup)
    except Exception as e:
        print(f"Error in process_html_content: {str(e)}")
        return content


def handle_request(req):
    global override_active, selected_month, selected_day, selected_year, TARGET_DATE, date_update_message

    parsed_url = urlparse(req.url)
    is_wayback_domain = parsed_url.netloc == DOMAIN

    if is_wayback_domain:
        if req.method == "POST":
            action = req.form.get("action")
            if action == "enable":
                override_active = True
                date_update_message = ""
            elif action == "disable":
                override_active = False
                date_update_message = ""
            elif action == "set date":
                override_active = True

                selected_month = req.form.get("month")
                selected_day = int(req.form.get("day"))
                selected_year = int(req.form.get("year"))

                _, last_day = calendar.monthrange(
                    selected_year, months.index(selected_month) + 1
                )
                if selected_day > last_day:
                    selected_day = last_day

                selected_date = datetime.datetime(
                    selected_year, months.index(selected_month) + 1, selected_day
                )
                current_date = datetime.datetime.now()

                if selected_year == current_year and selected_date > current_date:
                    selected_date = current_date

                selected_year = selected_date.year
                selected_month = months[selected_date.month - 1]
                selected_day = selected_date.day

                month_num = str(selected_date.month).zfill(2)
                TARGET_DATE = f"{selected_year}{month_num}{str(selected_day).zfill(2)}"

                date_update_message = (
                    f"{selected_month} {selected_day}, {selected_year}"
                )

        return (
            render_template_string(
                HTML_TEMPLATE,
                override_active=override_active,
                months=months,
                selected_month=selected_month,
                selected_day=selected_day,
                selected_year=selected_year,
                current_year=current_year,
                date_update_message=date_update_message,
            ),
            200,
        )

    try:
        url = req.url
        debug_print(f"Handling request for: {url}")

        response = make_archive_request(url)

        content = response.content
        if not content:
            raise Exception("Empty response received from archive")

        content_type = response.headers.get("Content-Type", "").split(";")[0].strip()
        debug_print(f"Content-Type: {content_type}")

        # Even if it's a 404, process and return the content as it might be an archived 404 page
        if content_type.startswith("image/"):
            return content, response.status_code, {"Content-Type": content_type}

        if content_type.startswith("text/html"):
            content = content.decode("utf-8", errors="replace")
            processed_content = process_html_content(content, url)
            return (
                processed_content,
                response.status_code,
                {"Content-Type": "text/html"},
            )

        elif content_type.startswith("text/") or content_type in [
            "application/javascript",
            "application/json",
        ]:
            decoded_content = content.decode("utf-8", errors="replace")
            return decoded_content, response.status_code, {"Content-Type": content_type}

        else:
            return content, response.status_code, {"Content-Type": content_type}

    except Exception as e:
        print(f"Error occurred: {str(e)}")
        return (
            f"<html><body><p>Error fetching archived page: {str(e)}</p></body></html>",
            500,
            {"Content-Type": "text/html"},
        )