save_screenshot.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Get full page screenshots from archived web pages"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "%%capture\n",
    "from selenium import webdriver\n",
    "import requests\n",
    "import selenium\n",
    "from PIL import Image\n",
    "import PIL\n",
    "import io\n",
    "import base64\n",
    "import time\n",
    "import re\n",
    "import math\n",
    "import arrow\n",
    "from slugify import slugify\n",
    "from webdriverdownloader import GeckoDriverDownloader\n",
    "from pathlib import Path\n",
    "from IPython.display import display, HTML\n",
    "from urllib.parse import urlparse\n",
    "import ipywidgets as widgets\n",
    "\n",
    "gdd = GeckoDriverDownloader()\n",
    "geckodriver = gdd.download_and_install(\"v0.26.0\")[1]"
   ]
  },
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   "cell_type": "code",
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   "source": [
    "%%javascript\n",
    "// This is necessary in Jupyter notebook to stop the output area folding up\n",
    "// Will give an error in Jupyter Lab\n",
    "IPython.OutputArea.prototype._should_scroll = function(lines) {return false}"
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   "source": [
    "TIMEGATES = {\n",
    "    'nla': 'https://web.archive.org.au/awa/',\n",
    "    'nlnz': 'https://ndhadeliver.natlib.govt.nz/webarchive/wayback/',\n",
    "    'bl': 'https://www.webarchive.org.uk/wayback/archive/',\n",
    "    'ia': 'https://web.archive.org/web/'\n",
    "}\n",
    "\n",
    "wayback = ['ndhadeliver.natlib.govt.nz', 'web.archive.org']\n",
    "pywb = {'web.archive.org.au': 'replayFrame', 'webarchive.nla.gov.au': 'replayFrame', 'webarchive.org.uk': 'replay_iframe'}\n",
    "\n",
    "html_output = []\n",
    "\n",
    "def format_date_for_headers(iso_date, tz):\n",
    "    '''\n",
    "    Convert an ISO date (YYYY-MM-DD) to a datetime at noon in the specified timezone.\n",
    "    Convert the datetime to UTC and format as required by Accet-Datetime headers:\n",
    "    eg Fri, 23 Mar 2007 01:00:00 GMT\n",
    "    '''\n",
    "    local = arrow.get(f'{iso_date} 12:00:00 {tz}', 'YYYY-MM-DD HH:mm:ss ZZZ')\n",
    "    gmt = local.to('utc')\n",
    "    return f'{gmt.format(\"ddd, DD MMM YYYY HH:mm:ss\")} GMT'\n",
    "\n",
    "def format_date_from_timestamp(url):\n",
    "    timestamp = re.search(r'/(\\d{14})(?:if_|mp_)*/', url).group(1)\n",
    "    return arrow.get(timestamp, 'YYYYMMDDHHmmss').format('D MMMM YYYY')\n",
    "\n",
    "def parse_links_from_headers(response):\n",
    "    '''\n",
    "    Extract original, timegate, timemap, and memento links from 'Link' header.\n",
    "    '''\n",
    "    links = response.links\n",
    "    return {k: v['url'] for k, v in links.items()}\n",
    "\n",
    "def query_timegate(timegate, url, date=None, tz='Australia/Canberra'):\n",
    "    headers = {}\n",
    "    if date:\n",
    "        formatted_date = format_date_for_headers(date, tz)\n",
    "        headers['Accept-Datetime'] = formatted_date\n",
    "    # BL & NLNZ don't seem to default to latest date if no date supplied\n",
    "    elif not date and timegate in ['bl', 'nlnz']:\n",
    "        formatted_date = format_date_for_headers(arrow.utcnow().format('YYYY-MM-DD'), tz)\n",
    "        headers['Accept-Datetime'] = formatted_date\n",
    "    # Note that you don't get a timegate response if you leave off the trailing slash, but extras don't hurt!\n",
    "    tg_url = f'{TIMEGATES[timegate]}{url}/' if not url.endswith('/') else f'{TIMEGATES[timegate]}{url}'\n",
    "    # print(tg_url)\n",
    "    # IA doesn't work with head, others don't work with get...\n",
    "    if timegate == 'ia':\n",
    "        response = requests.get(tg_url, headers=headers)\n",
    "    else:\n",
    "        response = requests.head(tg_url, headers=headers)\n",
    "    return parse_links_from_headers(response)\n",
    "\n",
    "def get_memento(timegate, url, date):\n",
    "    links = query_timegate(timegate, url, date)\n",
    "    # NLNZ doesn't always seem to return a Memento, so we'll build in some fuzziness\n",
    "    if links:\n",
    "        if 'memento' in links:\n",
    "            memento = links['memento']\n",
    "        elif 'prev memento' in links:\n",
    "            memento = links['prev memento']\n",
    "        elif 'next memento' in links:\n",
    "            memento = links['next memento']\n",
    "        elif 'last memento' in links:\n",
    "            memento = links['last memento']\n",
    "    else:\n",
    "        memento = None\n",
    "    return memento\n",
    "    \n",
    "def get_full_page_screenshot(url, save_width=200):\n",
    "    '''\n",
    "    Gets a full page screenshot of the supplied url.\n",
    "    By default resizes the screenshot to a maximum width of 200px.\n",
    "    Provide a 'save_width' value to change this.\n",
    "    \n",
    "    NOTE the webdriver sometimes fails for unknown reasons. Just try again.\n",
    "    '''\n",
    "    global html_output\n",
    "    domain = urlparse(url)[1].replace('www.', '')\n",
    "    # NZ and IA inject content into the page, so we use if_ to get the original page (with rewritten urls)\n",
    "    if domain in wayback and 'if_' not in url:\n",
    "        url = re.sub(r'/(\\d{14})/http', r'/\\1if_/http', url)\n",
    "    try:\n",
    "        date_str, site = re.search(r'/(\\d{14})(?:if_|mp_)*/https*://(.+/)', url).groups()\n",
    "    except AttributeError:\n",
    "        # There's something wrong with the link...\n",
    "        # print(url)\n",
    "        show_error(f'{url} isn\\'t a Memento – did you forget to select an archive?')\n",
    "    else:\n",
    "        output_dir = Path('screenshots')\n",
    "        output_dir.mkdir(parents=True, exist_ok=True)\n",
    "        ss_file = Path(output_dir, f'{slugify(site)}-{date_str}-{save_width}.png')\n",
    "        options = webdriver.FirefoxOptions()\n",
    "        options.headless = True\n",
    "        driver = webdriver.Firefox(executable_path=geckodriver, options=options)\n",
    "        driver.implicitly_wait(15)\n",
    "        driver.get(url)\n",
    "        # Give some time for everything to load\n",
    "        time.sleep(30)\n",
    "        driver.maximize_window()\n",
    "        current_width = driver.get_window_size()['width']\n",
    "        # UK and AU use pywb in framed replay mode, so we need to switch to the framed content\n",
    "        if domain in pywb:\n",
    "            try:\n",
    "                driver.switch_to.frame(pywb[domain])\n",
    "            except selenium.common.exceptions.NoSuchFrameException:\n",
    "                # If we pass here we'll probably still get a ss, just not full page -- better than failing?\n",
    "                pass\n",
    "        ss = None\n",
    "        for tag in ['body', 'html', 'frameset']:\n",
    "            try:\n",
    "                elem = driver.find_element_by_tag_name(tag)\n",
    "                ss = elem.screenshot_as_base64\n",
    "                break\n",
    "            except (selenium.common.exceptions.NoSuchElementException, selenium.common.exceptions.WebDriverException):\n",
    "                pass\n",
    "        driver.quit()\n",
    "        if not ss:\n",
    "            show_error(f'Couldn\\'t get a screenshot of {url} – sorry...')\n",
    "        else:\n",
    "            img = Image.open(io.BytesIO(base64.b64decode(ss)))\n",
    "            ratio = save_width / img.width\n",
    "            (width, height) = (save_width, math.ceil(img.height * ratio))\n",
    "            resized_img = img.resize((width, height), PIL.Image.LANCZOS)\n",
    "            resized_img.save(ss_file)\n",
    "            return ss_file\n",
    "        \n",
    "def display_screenshot(ss_file, url):\n",
    "    date = format_date_from_timestamp(url)\n",
    "    try:\n",
    "        display_url = re.search(r'/\\d{14}(?:mp_|if_|id_)*/(.*)$', url).group(1)\n",
    "    except AttributeError:\n",
    "        display_url = url\n",
    "    status.clear_output()\n",
    "    html_output.append(f'<div style=\"float:left; margin-left: 20px;\"><p><b>{date}</b><br><a href=\"{url.replace(\"if_/\", \"/\")}\">{display_url}</a></p><p><a href=\"{ss_file}\"><img src=\"{ss_file}\"></a><br><a href=\"{ss_file}\">[Download]</a></p></div>')\n",
    "    with out:\n",
    "        display((HTML(''.join(html_output))))\n",
    "\n",
    "def show_error(message=None):\n",
    "    status.clear_output()\n",
    "    with status:\n",
    "        print(f'Something went wrong – {message}')\n",
    "\n",
    "def start(e):\n",
    "    status.clear_output()\n",
    "    out.clear_output(wait=True)\n",
    "    with status:\n",
    "        print('Generating screenshot...')\n",
    "    if repository.value:\n",
    "        memento = get_memento(repository.value, target_url.value, target_date.value)\n",
    "    else:\n",
    "        memento = target_url.value\n",
    "    if memento:\n",
    "        try:\n",
    "            ss_file = get_full_page_screenshot(memento, save_width=width.value)\n",
    "            if ss_file:\n",
    "                display_screenshot(ss_file, memento)\n",
    "        except selenium.common.exceptions.WebDriverException:\n",
    "            show_error(f'couldn\\'t get a screenshot of {memento} – sorry...')\n",
    "    else:\n",
    "        show_error('couldn\\'t find a Memento – sorry...')\n",
    "    \n",
    "def clear(e):\n",
    "    global html_output\n",
    "    html_output = []\n",
    "    status.clear_output()\n",
    "    out.clear_output()\n",
    "    \n",
    "def clear_last(e):\n",
    "    global html_output\n",
    "    html_output.pop()\n",
    "    out.clear_output(wait=True)\n",
    "    with out:\n",
    "        display((HTML(''.join(html_output))))\n",
    "\n",
    "repository = widgets.Dropdown(\n",
    "    options=[('---', ''), ('UK Web Archive', 'bl'), ('National Library of Australia', 'nla'), ('National Library of New Zealand', 'nlnz'), ('Internet Archive', 'ia')],\n",
    "    description='Archive:',\n",
    "    disabled=False,\n",
    ")\n",
    "\n",
    "target_url = widgets.Text(description='Target URL:')\n",
    "\n",
    "target_date = widgets.DatePicker(\n",
    "    description='Target date: ',\n",
    "    disabled=False\n",
    ")\n",
    "\n",
    "width = widgets.IntSlider(\n",
    "    value=7,\n",
    "    min=200,\n",
    "    max=1000,\n",
    "    step=100,\n",
    "    description='Width:',\n",
    "    disabled=False,\n",
    "    continuous_update=False,\n",
    "    orientation='horizontal',\n",
    "    readout=True,\n",
    "    readout_format='d'\n",
    ")\n",
    "\n",
    "out = widgets.Output()\n",
    "status = widgets.Output()\n",
    "ss_button = widgets.Button(description='Get screenshot', button_style='primary')\n",
    "ss_button.on_click(start)\n",
    "clear_button = widgets.Button(description='Clear all')\n",
    "clear_button.on_click(clear)\n",
    "clear_last_button = widgets.Button(description='Clear last')\n",
    "clear_last_button.on_click(clear_last)\n",
    "note = '''\n",
    "    <ul>\n",
    "    <li>Select a repository, and insert a url to generate a screenshot from the archive.</li>\n",
    "    <li>If you include a date, it\\'ll attempt to find the closest capture using Memento Timegates.</li>\n",
    "    <li>If you don't include a date, it'll give you the most recent capture.</li>\n",
    "    <li>If you already have the url of the exact capture you want, just put it in the 'Target url' box and leave 'Archive' and 'Target date' blank.\n",
    "    <li>You can add multiple screenshots to compare changes.</li>\n",
    "    </ul>\n",
    "    '''\n",
    "display(HTML(note), widgets.HBox([widgets.VBox([repository, target_date]), widgets.VBox([target_url, width])], layout=widgets.Layout(padding='20px')), widgets.HBox([ss_button, clear_button, clear_last_button]), status, out)"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "----\n",
    "Created by [Tim Sherratt](https://timsherratt.org) for the [GLAM Workbench](https://glam-workbench.github.io).\n",
    "\n",
    "Work on this notebook was supported by the [IIPC Discretionary Funding Programme 2019-2020](http://netpreserve.org/projects/)"
   ]
  }
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          "text/html": "<div style=\"float:left; margin-left: 20px;\"><p><b>5 March 2020</b><br><a href=\"https://web.archive.org.au/awa/20200305172547mp_/http://pandora.nla.gov.au/pan/161756/20200306-0200/www.nla.gov.au/index.html\">http://pandora.nla.gov.au/pan/161756/20200306-0200/www.nla.gov.au/index.html</a></p><p><a href=\"screenshots/pandora-nla-gov-au-pan-161756-20200306-0200-www-nla-gov-au-20200305172547-200.png\"><img src=\"screenshots/pandora-nla-gov-au-pan-161756-20200306-0200-www-nla-gov-au-20200305172547-200.png\"></a><br><a href=\"screenshots/pandora-nla-gov-au-pan-161756-20200306-0200-www-nla-gov-au-20200305172547-200.png\">[Download]</a></p></div>",
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