notebook
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Archiving the sandbox\n",
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"\n",
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"* http://hub.xpub.nl/sandbot/\n",
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"\n",
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"In the \"spider\", the patterns you add are regex's that both **filter the URLs that you want to copy** (so matching a pattern means it becomes part of the archive) and it also **specifies how to rewrite the URL to a local path**\n",
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"\n",
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"URLs that don't match the patterns stay \"as-is\" allowing you to still have links \"outside\" to external things.\n",
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"\n",
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"URLs that match that pattern get relativized to a local path, and the spider makes sure the linked files also get downloaded (and again spidered)\n",
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"\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {},
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"outputs": [],
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"source": [
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"import requests\n",
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"from urllib.parse import urljoin, urlparse, quote as urlquote, unquote as urlunquote\n",
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"import html5lib\n",
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"from xml.etree import ElementTree as ET\n",
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"import os\n",
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"import re\n",
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"import sys\n",
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"from hashlib import md5\n",
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"\n",
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"import urllib3\n",
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"# https://stackoverflow.com/questions/27981545/suppress-insecurerequestwarning-unverified-https-request-is-being-made-in-pytho\n",
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"urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Three ways to [back reference in re](https://docs.python.org/3/library/re.html#re.sub):\n",
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"\n",
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" \\g<name>\n",
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" \\g<1>\n",
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" \\1"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"It's really useful when saving resources to use the appropriate/conventional file extension for that kind of file. URLs don't always include a filename with an extension, the HTTP protocol specifies file types using the \"Content-type\" header and a value, known as a MIME type, a protocol originally developed for specifying file types in email attachments. The EXT dictionary provides a mapping of MIME types we expect to receive to suitable file extensions."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 23,
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"metadata": {},
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"outputs": [],
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"source": [
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"EXT = {\n",
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" \"text/html\": \"html\",\n",
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" \"text/css\": \"css\",\n",
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" \"image/jpeg\": \"jpg\",\n",
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" \"image/png\": \"png\",\n",
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" \"image/gif\": \"gif\",\n",
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" \"application/javascript\": \"js\",\n",
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" \"text/javascript\": \"js\",\n",
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" \"video/webm\": \"webm\"\n",
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"}\n",
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"\n",
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"def memoize(f):\n",
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" memo = {}\n",
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" def helper(x):\n",
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" if x not in memo: \n",
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" memo[x] = f(x)\n",
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" return memo[x]\n",
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" return helper\n",
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"\n",
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"@memoize\n",
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"def ext_for (url):\n",
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" # try / allow simple extension test to override\n",
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" parts = urlparse(url)\n",
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" if parts.path:\n",
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" ext = os.path.splitext(parts.path)[1].lstrip(\".\").lower()\n",
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" if ext in ('html', 'js', 'css', 'gif', 'jpg', 'png', 'jpeg', 'mp3', 'ogg', 'ogv', 'webm', 'mp4', 'svg', 'webp'):\n",
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" return ext\n",
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" try:\n",
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" r = requests.head(url, verify=False)\n",
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" ct = r.headers['content-type'].split(\";\")[0]\n",
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" if ct not in EXT:\n",
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" print (f\"Warning, unknown extension for content-type {ct}, using bin\", file=sys.stderr)\n",
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" return EXT.get(ct, \"bin\")\n",
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" except Exception as e:\n",
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" print (f\"Exception {url}: {e}\", file=sys.stderr)\n",
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" return \"bin\"\n",
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"\n",
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"def split_fragment(href):\n",
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" try:\n",
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" ri = href.rindex(\"#\")\n",
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" return href[:ri], href[ri:]\n",
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" except ValueError:\n",
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" return href, ''\n",
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"\n",
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"def split_query(href):\n",
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" try:\n",
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" ri = href.rindex(\"?\")\n",
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" return href[:ri], href[ri:]\n",
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" except ValueError:\n",
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" return href, ''\n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"With all the functions in place, the actual spider loop is relatively straightforward. There's a todo list, and a set called done to remember what URLs have already been downloaded."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"2021 05 24: Adding optional encoding to make force encoding on HTML pages (requests seems to get it wrong sometimes)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 56,
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"metadata": {},
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"outputs": [],
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"source": [
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"class Spider:\n",
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" def __init__(self, output_path=\".\", \\\n",
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" skip_existing_files=False, \\\n",
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" pattern_flags=0, \\\n",
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" verbose=False, \\\n",
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" preserve_query=True, \\\n",
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" additional_attributes=None,\n",
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" encoding=None):\n",
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" self.verbose = verbose\n",
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" self.pattern_flags = pattern_flags\n",
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" self.patterns = []\n",
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" self.output_path = output_path\n",
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" self.skip_existing_files = skip_existing_files\n",
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" self.preserve_query = preserve_query\n",
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" self.additional_attributes = []\n",
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" self.encoding = encoding\n",
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" if additional_attributes:\n",
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" if type(additional_attributes) == str:\n",
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" self.additional_attributes.append(additional_attributes)\n",
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" else:\n",
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" self.additional_attributes.extend(additional_attributes)\n",
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" self.rewrites = []\n",
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"\n",
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" def add_pattern (self, search, replace, post_process=None):\n",
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" \"\"\" nb:the replace should always form a local path, with no query\n",
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" as re.sub is used, the search should probably capture the entire string ^$\n",
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" otherwise unmatched trailing stuff (for instance) can suddenly appear at the end\n",
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" (would this be a nicer way to allow queries to be preserved?? ... but then would need to change the code to reparse query in the local path)\n",
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" \"\"\"\n",
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" if type(search) == str:\n",
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" search = re.compile(search, flags=self.pattern_flags)\n",
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" self.patterns.append((search, replace, post_process))\n",
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"\n",
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" def sub_pattern (self, url):\n",
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" for psearch, preplace, post_process in self.patterns:\n",
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" m = psearch.search(url)\n",
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" if m:\n",
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" ret = psearch.sub(preplace, url)\n",
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" if post_process:\n",
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" ret = post_process(ret)\n",
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" return ret\n",
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"\n",
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" def url_to_local_path (self, url):\n",
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" ret = self.sub_pattern(url)\n",
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" if ret:\n",
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" ret = urlunquote(ret)\n",
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" return ret\n",
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"\n",
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" def generic_url_to_path (self, url):\n",
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" md5hash = md5(url.encode()).hexdigest()\n",
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" parts = urlparse(url)\n",
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" ext = ext_for(url)\n",
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" return f\"ext/{md5hash}.{ext}\"\n",
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"\n",
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" def url_to_path (self, url):\n",
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" l = self.url_to_local_path(url)\n",
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" if l:\n",
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" return l\n",
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" else:\n",
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" return self.generic_url_to_path(url)\n",
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"\n",
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" def localize (self, url):\n",
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" if url not in self.done and url not in self.todo:\n",
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" self.todo.append(url)\n",
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" ret = self.url_to_path(url)\n",
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" # print (f\"localize {url} => {ret}\")\n",
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" return ret\n",
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"\n",
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" def should_localize(self, url):\n",
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" return self.url_to_local_path(url) is not None\n",
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"\n",
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" def relpath (self, to_file, from_file):\n",
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" return os.path.relpath(to_file, os.path.dirname(from_file))\n",
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" \n",
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" def download(self, url):\n",
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" path = self.url_to_path(url)\n",
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" usepath = os.path.join(self.output_path, path)\n",
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" if self.skip_existing_files and os.path.exists(usepath):\n",
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" if self.verbose:\n",
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" print (\"File already exists, skipping...\")\n",
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" return # why do I need to add this back ?! (2021-03-06)\n",
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" #if self.verbose:\n",
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" additional_attributes = []\n",
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" if self.additional_attributes:\n",
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" additional_attributes.extend(self.additional_attributes)\n",
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" all_attributes = [\"href\"] + additional_attributes\n",
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" self.rewrites.append((url, usepath))\n",
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" print (f\"{url} => {usepath}\")\n",
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" if os.path.dirname(usepath):\n",
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" os.makedirs(os.path.dirname(usepath), exist_ok=True)\n",
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" try:\n",
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" r = requests.get(url, verify=False)\n",
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" if r.headers[\"content-type\"].startswith(\"text/html\"):\n",
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" if self.encoding:\n",
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" r.encoding = self.encoding\n",
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" t = html5lib.parse(r.text, namespaceHTMLElements=False)\n",
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"\n",
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" for elt in t.findall(\".//*[@src]\"):\n",
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" src = urljoin(url, elt.attrib.get(\"src\"))\n",
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" # print (elt.tag, src, url_to_path(src))\n",
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" local_link = self.localize(src)\n",
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" elt.attrib[\"src\"] = urlquote(self.relpath(local_link, path))\n",
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" for attribname in all_attributes:\n",
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" for elt in t.findall(f\".//*[@{attribname}]\"):\n",
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" href = urljoin(url, elt.attrib.get(attribname))\n",
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" href, fragment = split_fragment(href)\n",
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" if self.preserve_query:\n",
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" href_noquery, query = split_query(href)\n",
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" else:\n",
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" query = ''\n",
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" # print (elt.tag, href, url_to_path(href))\n",
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" if (elt.tag == \"link\" and elt.attrib.get(\"rel\") == \"stylesheet\") or \\\n",
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" (elt.tag == \"a\" and self.should_localize(href)) or \\\n",
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" (attribname in additional_attributes and self.should_localize(href)):\n",
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" # localize: force/ensure download href, return local path\n",
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" local_link = self.localize(href)\n",
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" # need path == current document path\n",
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" elt.attrib[attribname] = urlquote(self.relpath(local_link, path)) + query + fragment\n",
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"\n",
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" with open(usepath, \"w\") as fout:\n",
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" print(ET.tostring(t, method=\"html\", encoding=\"unicode\"), file=fout)\n",
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" elif r.headers[\"content-type\"] == \"text/css\":\n",
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" if self.encoding:\n",
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" r.encoding = self.encoding\n",
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" src = r.text\n",
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" def css_sub(m):\n",
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" href = urljoin(url, m.group(2))\n",
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" if self.should_localize(href):\n",
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" local_link = self.localize(href)\n",
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" return \"url(\"+m.group(1)+urlquote(self.relpath(local_link, path))+m.group(3)+\")\"\n",
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" return m.group(0) \n",
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" newsrc = re.sub(r\"\"\"url\\((['\" ]*)(.+?)(['\" ]*)\\)\"\"\", css_sub, src)\n",
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" with open(usepath, \"w\") as fout:\n",
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" print(newsrc, file=fout)\n",
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" else:\n",
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" # print (\"Downloading binary...\")\n",
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|
" with open(usepath, 'wb') as fd:\n",
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" for chunk in r.iter_content(chunk_size=1024):\n",
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" fd.write(chunk)\n",
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|
" except Exception as e:\n",
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" print (f\"Exception {url}: {e}\", file=sys.stderr)\n",
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" \n",
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|
" def spider (self, url):\n",
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" self.done = set()\n",
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" self.todo = [url]\n",
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" count = 0\n",
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|
" while self.todo:\n",
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" url = self.todo[0]\n",
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" self.todo = self.todo[1:]\n",
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" self.done.add(url)\n",
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" self.download(url)\n",
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" count +=1 "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"metadata": {},
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"outputs": [],
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"source": [
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||||||
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"# cleanup\n",
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"!rm -rf sandbox_archive/"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 27,
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"metadata": {},
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"outputs": [],
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"source": [
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"# remove all html\n",
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"def rm_html (path):\n",
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" rmlist = []\n",
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" for root, dirs, files in os.walk(\"sandbox_archive\"):\n",
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" for f in files:\n",
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" if os.path.splitext(f)[1] == \".html\":\n",
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" rmlist.append(os.path.join(root, f))\n",
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" for f in rmlist:\n",
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" print (f)\n",
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" os.remove(f)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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|
"metadata": {},
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"outputs": [],
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"source": [
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||||||
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"rm_html(\"sandbox_archive\")"
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]
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},
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{
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|
"cell_type": "code",
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"execution_count": 57,
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"metadata": {},
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"outputs": [],
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"source": [
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||||||
|
"spider = Spider(\"sandbox_archive\", skip_existing_files=True, additional_attributes=\"data-url\", encoding=\"utf-8\")\n",
|
||||||
|
"spider.add_pattern(r\"^https?://hub\\.xpub\\.nl/sandbox/$\", \"index.html\")\n",
|
||||||
|
"spider.add_pattern(r\"^https?://hub\\.xpub\\.nl/sandbox/(.+)$\", \"\\g<1>\")\n"
|
||||||
|
]
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|
},
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|
{
|
||||||
|
"cell_type": "code",
|
||||||
|
"execution_count": null,
|
||||||
|
"metadata": {
|
||||||
|
"tags": []
|
||||||
|
},
|
||||||
|
"outputs": [],
|
||||||
|
"source": [
|
||||||
|
"spider.spider(\"https://hub.xpub.nl/sandbox/\")"
|
||||||
|
]
|
||||||
|
},
|
||||||
|
{
|
||||||
|
"cell_type": "code",
|
||||||
|
"execution_count": null,
|
||||||
|
"metadata": {},
|
||||||
|
"outputs": [],
|
||||||
|
"source": []
|
||||||
|
}
|
||||||
|
],
|
||||||
|
"metadata": {
|
||||||
|
"kernelspec": {
|
||||||
|
"display_name": "Python 3",
|
||||||
|
"language": "python",
|
||||||
|
"name": "python3"
|
||||||
|
},
|
||||||
|
"language_info": {
|
||||||
|
"codemirror_mode": {
|
||||||
|
"name": "ipython",
|
||||||
|
"version": 3
|
||||||
|
},
|
||||||
|
"file_extension": ".py",
|
||||||
|
"mimetype": "text/x-python",
|
||||||
|
"name": "python",
|
||||||
|
"nbconvert_exporter": "python",
|
||||||
|
"pygments_lexer": "ipython3",
|
||||||
|
"version": "3.7.3"
|
||||||
|
}
|
||||||
|
},
|
||||||
|
"nbformat": 4,
|
||||||
|
"nbformat_minor": 4
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue