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1 | """ | |
2 | Internal utility functions. | |
3 | ||
4 | `htmlentitydecode` came from here: | |
5 | http://wiki.python.org/moin/EscapingHtml | |
6 | """ | |
7 | ||
8 | from __future__ import print_function | |
9 | ||
10 | import contextlib | |
11 | import re | |
12 | import sys | |
13 | import time | |
14 | import socket | |
15 | ||
16 | try: | |
17 | from html.entities import name2codepoint | |
18 | unichr = chr | |
19 | import urllib.request as urllib2 | |
20 | import urllib.parse as urlparse | |
21 | except ImportError: | |
22 | from htmlentitydefs import name2codepoint | |
23 | import urllib2 | |
24 | import urlparse | |
25 | ||
26 | def htmlentitydecode(s): | |
27 | return re.sub( | |
28 | '&(%s);' % '|'.join(name2codepoint), | |
29 | lambda m: unichr(name2codepoint[m.group(1)]), s) | |
30 | ||
31 | def smrt_input(globals_, locals_, ps1=">>> ", ps2="... "): | |
32 | inputs = [] | |
33 | while True: | |
34 | if inputs: | |
35 | prompt = ps2 | |
36 | else: | |
37 | prompt = ps1 | |
38 | inputs.append(input(prompt)) | |
39 | try: | |
40 | ret = eval('\n'.join(inputs), globals_, locals_) | |
41 | if ret: | |
42 | print(str(ret)) | |
43 | return | |
44 | except SyntaxError: | |
45 | pass | |
46 | ||
47 | def printNicely(string): | |
48 | if hasattr(sys.stdout, 'buffer'): | |
49 | sys.stdout.buffer.write(string.encode('utf8')) | |
50 | print() | |
51 | else: | |
52 | print(string.encode('utf8')) | |
53 | ||
54 | __all__ = ["htmlentitydecode", "smrt_input"] | |
55 | ||
56 | def err(msg=""): | |
57 | print(msg, file=sys.stderr) | |
58 | ||
59 | class Fail(object): | |
60 | """A class to count fails during a repetitive task. | |
61 | ||
62 | Args: | |
63 | maximum: An integer for the maximum of fails to allow. | |
64 | exit: An integer for the exit code when maximum of fail is reached. | |
65 | ||
66 | Methods: | |
67 | count: Count a fail, exit when maximum of fails is reached. | |
68 | wait: Same as count but also sleep for a given time in seconds. | |
69 | """ | |
70 | def __init__(self, maximum=10, exit=1): | |
71 | self.i = maximum | |
72 | self.exit = exit | |
73 | ||
74 | def count(self): | |
75 | self.i -= 1 | |
76 | if self.i == 0: | |
77 | err("Too many consecutive fails, exiting.") | |
78 | raise SystemExit(self.exit) | |
79 | ||
80 | def wait(self, delay=0): | |
81 | self.count() | |
82 | if delay > 0: | |
83 | time.sleep(delay) | |
84 | ||
85 | ||
86 | def find_links(line): | |
87 | """Find all links in the given line. The function returns a sprintf style | |
88 | format string (with %s placeholders for the links) and a list of urls.""" | |
89 | l = line.replace("%", "%%") | |
90 | regex = "(https?://[^ )]+)" | |
91 | return ( | |
92 | re.sub(regex, "%s", l), | |
93 | [m.group(1) for m in re.finditer(regex, l)]) | |
94 | ||
95 | def follow_redirects(link, sites= None): | |
96 | """Follow directs for the link as long as the redirects are on the given | |
97 | sites and return the resolved link.""" | |
98 | def follow(url): | |
99 | return sites == None or urlparse.urlparse(url).hostname in sites | |
100 | ||
101 | class RedirectHandler(urllib2.HTTPRedirectHandler): | |
102 | def __init__(self): | |
103 | self.last_url = None | |
104 | def redirect_request(self, req, fp, code, msg, hdrs, newurl): | |
105 | self.last_url = newurl | |
106 | if not follow(newurl): | |
107 | return None | |
108 | r = urllib2.HTTPRedirectHandler.redirect_request( | |
109 | self, req, fp, code, msg, hdrs, newurl) | |
110 | r.get_method = lambda : 'HEAD' | |
111 | return r | |
112 | ||
113 | if not follow(link): | |
114 | return link | |
115 | redirect_handler = RedirectHandler() | |
116 | opener = urllib2.build_opener(redirect_handler) | |
117 | req = urllib2.Request(link) | |
118 | req.get_method = lambda : 'HEAD' | |
119 | try: | |
120 | with contextlib.closing(opener.open(req,timeout=1)) as site: | |
121 | return site.url | |
122 | except (urllib2.HTTPError, urllib2.URLError, socket.timeout): | |
123 | return redirect_handler.last_url if redirect_handler.last_url else link | |
124 | ||
125 | def expand_line(line, sites): | |
126 | """Expand the links in the line for the given sites.""" | |
127 | l = line.strip() | |
128 | msg_format, links = find_links(l) | |
129 | args = tuple(follow_redirects(l, sites) for l in links) | |
130 | return msg_format % args | |
131 | ||
132 | def parse_host_list(list_of_hosts): | |
133 | """Parse the comma separated list of hosts.""" | |
134 | p = set( | |
135 | m.group(1) for m in re.finditer("\s*([^,\s]+)\s*,?\s*", list_of_hosts)) | |
136 | return p | |
137 |