You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
378 lines
14 KiB
Plaintext
378 lines
14 KiB
Plaintext
{
|
|
"cells": [
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"## Archiving the sandbox\n",
|
|
"\n",
|
|
"* http://hub.xpub.nl/sandbot/\n",
|
|
"\n",
|
|
"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",
|
|
"\n",
|
|
"URLs that don't match the patterns stay \"as-is\" allowing you to still have links \"outside\" to external things.\n",
|
|
"\n",
|
|
"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",
|
|
"\n"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 1,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"import requests\n",
|
|
"from urllib.parse import urljoin, urlparse, quote as urlquote, unquote as urlunquote\n",
|
|
"import html5lib\n",
|
|
"from xml.etree import ElementTree as ET\n",
|
|
"import os\n",
|
|
"import re\n",
|
|
"import sys\n",
|
|
"from hashlib import md5\n",
|
|
"\n",
|
|
"import urllib3\n",
|
|
"# https://stackoverflow.com/questions/27981545/suppress-insecurerequestwarning-unverified-https-request-is-being-made-in-pytho\n",
|
|
"urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"Three ways to [back reference in re](https://docs.python.org/3/library/re.html#re.sub):\n",
|
|
"\n",
|
|
" \\g<name>\n",
|
|
" \\g<1>\n",
|
|
" \\1"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"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."
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 23,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"EXT = {\n",
|
|
" \"text/html\": \"html\",\n",
|
|
" \"text/css\": \"css\",\n",
|
|
" \"image/jpeg\": \"jpg\",\n",
|
|
" \"image/png\": \"png\",\n",
|
|
" \"image/gif\": \"gif\",\n",
|
|
" \"application/javascript\": \"js\",\n",
|
|
" \"text/javascript\": \"js\",\n",
|
|
" \"video/webm\": \"webm\"\n",
|
|
"}\n",
|
|
"\n",
|
|
"def memoize(f):\n",
|
|
" memo = {}\n",
|
|
" def helper(x):\n",
|
|
" if x not in memo: \n",
|
|
" memo[x] = f(x)\n",
|
|
" return memo[x]\n",
|
|
" return helper\n",
|
|
"\n",
|
|
"@memoize\n",
|
|
"def ext_for (url):\n",
|
|
" # try / allow simple extension test to override\n",
|
|
" parts = urlparse(url)\n",
|
|
" if parts.path:\n",
|
|
" ext = os.path.splitext(parts.path)[1].lstrip(\".\").lower()\n",
|
|
" if ext in ('html', 'js', 'css', 'gif', 'jpg', 'png', 'jpeg', 'mp3', 'ogg', 'ogv', 'webm', 'mp4', 'svg', 'webp'):\n",
|
|
" return ext\n",
|
|
" try:\n",
|
|
" r = requests.head(url, verify=False)\n",
|
|
" ct = r.headers['content-type'].split(\";\")[0]\n",
|
|
" if ct not in EXT:\n",
|
|
" print (f\"Warning, unknown extension for content-type {ct}, using bin\", file=sys.stderr)\n",
|
|
" return EXT.get(ct, \"bin\")\n",
|
|
" except Exception as e:\n",
|
|
" print (f\"Exception {url}: {e}\", file=sys.stderr)\n",
|
|
" return \"bin\"\n",
|
|
"\n",
|
|
"def split_fragment(href):\n",
|
|
" try:\n",
|
|
" ri = href.rindex(\"#\")\n",
|
|
" return href[:ri], href[ri:]\n",
|
|
" except ValueError:\n",
|
|
" return href, ''\n",
|
|
"\n",
|
|
"def split_query(href):\n",
|
|
" try:\n",
|
|
" ri = href.rindex(\"?\")\n",
|
|
" return href[:ri], href[ri:]\n",
|
|
" except ValueError:\n",
|
|
" return href, ''\n"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"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."
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "markdown",
|
|
"metadata": {},
|
|
"source": [
|
|
"2021 05 24: Adding optional encoding to make force encoding on HTML pages (requests seems to get it wrong sometimes)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 56,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"class Spider:\n",
|
|
" def __init__(self, output_path=\".\", \\\n",
|
|
" skip_existing_files=False, \\\n",
|
|
" pattern_flags=0, \\\n",
|
|
" verbose=False, \\\n",
|
|
" preserve_query=True, \\\n",
|
|
" additional_attributes=None,\n",
|
|
" encoding=None):\n",
|
|
" self.verbose = verbose\n",
|
|
" self.pattern_flags = pattern_flags\n",
|
|
" self.patterns = []\n",
|
|
" self.output_path = output_path\n",
|
|
" self.skip_existing_files = skip_existing_files\n",
|
|
" self.preserve_query = preserve_query\n",
|
|
" self.additional_attributes = []\n",
|
|
" self.encoding = encoding\n",
|
|
" if additional_attributes:\n",
|
|
" if type(additional_attributes) == str:\n",
|
|
" self.additional_attributes.append(additional_attributes)\n",
|
|
" else:\n",
|
|
" self.additional_attributes.extend(additional_attributes)\n",
|
|
" self.rewrites = []\n",
|
|
"\n",
|
|
" def add_pattern (self, search, replace, post_process=None):\n",
|
|
" \"\"\" nb:the replace should always form a local path, with no query\n",
|
|
" as re.sub is used, the search should probably capture the entire string ^$\n",
|
|
" otherwise unmatched trailing stuff (for instance) can suddenly appear at the end\n",
|
|
" (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",
|
|
" \"\"\"\n",
|
|
" if type(search) == str:\n",
|
|
" search = re.compile(search, flags=self.pattern_flags)\n",
|
|
" self.patterns.append((search, replace, post_process))\n",
|
|
"\n",
|
|
" def sub_pattern (self, url):\n",
|
|
" for psearch, preplace, post_process in self.patterns:\n",
|
|
" m = psearch.search(url)\n",
|
|
" if m:\n",
|
|
" ret = psearch.sub(preplace, url)\n",
|
|
" if post_process:\n",
|
|
" ret = post_process(ret)\n",
|
|
" return ret\n",
|
|
"\n",
|
|
" def url_to_local_path (self, url):\n",
|
|
" ret = self.sub_pattern(url)\n",
|
|
" if ret:\n",
|
|
" ret = urlunquote(ret)\n",
|
|
" return ret\n",
|
|
"\n",
|
|
" def generic_url_to_path (self, url):\n",
|
|
" md5hash = md5(url.encode()).hexdigest()\n",
|
|
" parts = urlparse(url)\n",
|
|
" ext = ext_for(url)\n",
|
|
" return f\"ext/{md5hash}.{ext}\"\n",
|
|
"\n",
|
|
" def url_to_path (self, url):\n",
|
|
" l = self.url_to_local_path(url)\n",
|
|
" if l:\n",
|
|
" return l\n",
|
|
" else:\n",
|
|
" return self.generic_url_to_path(url)\n",
|
|
"\n",
|
|
" def localize (self, url):\n",
|
|
" if url not in self.done and url not in self.todo:\n",
|
|
" self.todo.append(url)\n",
|
|
" ret = self.url_to_path(url)\n",
|
|
" # print (f\"localize {url} => {ret}\")\n",
|
|
" return ret\n",
|
|
"\n",
|
|
" def should_localize(self, url):\n",
|
|
" return self.url_to_local_path(url) is not None\n",
|
|
"\n",
|
|
" def relpath (self, to_file, from_file):\n",
|
|
" return os.path.relpath(to_file, os.path.dirname(from_file))\n",
|
|
" \n",
|
|
" def download(self, url):\n",
|
|
" path = self.url_to_path(url)\n",
|
|
" usepath = os.path.join(self.output_path, path)\n",
|
|
" if self.skip_existing_files and os.path.exists(usepath):\n",
|
|
" if self.verbose:\n",
|
|
" print (\"File already exists, skipping...\")\n",
|
|
" return # why do I need to add this back ?! (2021-03-06)\n",
|
|
" #if self.verbose:\n",
|
|
" additional_attributes = []\n",
|
|
" if self.additional_attributes:\n",
|
|
" additional_attributes.extend(self.additional_attributes)\n",
|
|
" all_attributes = [\"href\"] + additional_attributes\n",
|
|
" self.rewrites.append((url, usepath))\n",
|
|
" print (f\"{url} => {usepath}\")\n",
|
|
" if os.path.dirname(usepath):\n",
|
|
" os.makedirs(os.path.dirname(usepath), exist_ok=True)\n",
|
|
" try:\n",
|
|
" r = requests.get(url, verify=False)\n",
|
|
" if r.headers[\"content-type\"].startswith(\"text/html\"):\n",
|
|
" if self.encoding:\n",
|
|
" r.encoding = self.encoding\n",
|
|
" t = html5lib.parse(r.text, namespaceHTMLElements=False)\n",
|
|
"\n",
|
|
" for elt in t.findall(\".//*[@src]\"):\n",
|
|
" src = urljoin(url, elt.attrib.get(\"src\"))\n",
|
|
" # print (elt.tag, src, url_to_path(src))\n",
|
|
" local_link = self.localize(src)\n",
|
|
" elt.attrib[\"src\"] = urlquote(self.relpath(local_link, path))\n",
|
|
" for attribname in all_attributes:\n",
|
|
" for elt in t.findall(f\".//*[@{attribname}]\"):\n",
|
|
" href = urljoin(url, elt.attrib.get(attribname))\n",
|
|
" href, fragment = split_fragment(href)\n",
|
|
" if self.preserve_query:\n",
|
|
" href_noquery, query = split_query(href)\n",
|
|
" else:\n",
|
|
" query = ''\n",
|
|
" # print (elt.tag, href, url_to_path(href))\n",
|
|
" if (elt.tag == \"link\" and elt.attrib.get(\"rel\") == \"stylesheet\") or \\\n",
|
|
" (elt.tag == \"a\" and self.should_localize(href)) or \\\n",
|
|
" (attribname in additional_attributes and self.should_localize(href)):\n",
|
|
" # localize: force/ensure download href, return local path\n",
|
|
" local_link = self.localize(href)\n",
|
|
" # need path == current document path\n",
|
|
" elt.attrib[attribname] = urlquote(self.relpath(local_link, path)) + query + fragment\n",
|
|
"\n",
|
|
" with open(usepath, \"w\") as fout:\n",
|
|
" print(ET.tostring(t, method=\"html\", encoding=\"unicode\"), file=fout)\n",
|
|
" elif r.headers[\"content-type\"] == \"text/css\":\n",
|
|
" if self.encoding:\n",
|
|
" r.encoding = self.encoding\n",
|
|
" src = r.text\n",
|
|
" def css_sub(m):\n",
|
|
" href = urljoin(url, m.group(2))\n",
|
|
" if self.should_localize(href):\n",
|
|
" local_link = self.localize(href)\n",
|
|
" return \"url(\"+m.group(1)+urlquote(self.relpath(local_link, path))+m.group(3)+\")\"\n",
|
|
" return m.group(0) \n",
|
|
" newsrc = re.sub(r\"\"\"url\\((['\" ]*)(.+?)(['\" ]*)\\)\"\"\", css_sub, src)\n",
|
|
" with open(usepath, \"w\") as fout:\n",
|
|
" print(newsrc, file=fout)\n",
|
|
" else:\n",
|
|
" # print (\"Downloading binary...\")\n",
|
|
" with open(usepath, 'wb') as fd:\n",
|
|
" for chunk in r.iter_content(chunk_size=1024):\n",
|
|
" fd.write(chunk)\n",
|
|
" except Exception as e:\n",
|
|
" print (f\"Exception {url}: {e}\", file=sys.stderr)\n",
|
|
" \n",
|
|
" def spider (self, url):\n",
|
|
" self.done = set()\n",
|
|
" self.todo = [url]\n",
|
|
" count = 0\n",
|
|
" while self.todo:\n",
|
|
" url = self.todo[0]\n",
|
|
" self.todo = self.todo[1:]\n",
|
|
" self.done.add(url)\n",
|
|
" self.download(url)\n",
|
|
" count +=1 "
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 11,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"# cleanup\n",
|
|
"!rm -rf sandbox_archive/"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 27,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"# remove all html\n",
|
|
"def rm_html (path):\n",
|
|
" rmlist = []\n",
|
|
" for root, dirs, files in os.walk(\"sandbox_archive\"):\n",
|
|
" for f in files:\n",
|
|
" if os.path.splitext(f)[1] == \".html\":\n",
|
|
" rmlist.append(os.path.join(root, f))\n",
|
|
" for f in rmlist:\n",
|
|
" print (f)\n",
|
|
" os.remove(f)"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": null,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"rm_html(\"sandbox_archive\")"
|
|
]
|
|
},
|
|
{
|
|
"cell_type": "code",
|
|
"execution_count": 57,
|
|
"metadata": {},
|
|
"outputs": [],
|
|
"source": [
|
|
"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"
|
|
]
|
|
},
|
|
{
|
|
"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
|
|
}
|