Merge pull request #218 from edi-bice/master

[z_archive/twitter.git] / twitter / util.py

diff --git a/twitter/util.py b/twitter/util.py
index 27142af5636f22d2593994f6e2450533148a78fe..7831939a2c1e2a24b2e40573cefe5a92c16d72de 100644 (file)
--- a/twitter/util.py
+++ b/twitter/util.py
@@ -7,15 +7,22 @@ Internal utility functions.
 
 from __future__ import print_function
 
+import contextlib
 import re
 import sys
+import textwrap
 import time
+import socket
 
 try:
     from html.entities import name2codepoint
     unichr = chr
+    import urllib.request as urllib2
+    import urllib.parse as urlparse
 except ImportError:
     from htmlentitydefs import name2codepoint
+    import urllib2
+    import urlparse
 
 def htmlentitydecode(s):
     return re.sub(
@@ -75,3 +82,73 @@ class Fail(object):
         self.count()
         if delay > 0:
             time.sleep(delay)
+
+
+def find_links(line):
+    """Find all links in the given line. The function returns a sprintf style
+    format string (with %s placeholders for the links) and a list of urls."""
+    l = line.replace("%", "%%")
+    regex = "(https?://[^ )]+)"
+    return (
+        re.sub(regex, "%s", l),
+        [m.group(1) for m in re.finditer(regex, l)])
+
+def follow_redirects(link, sites= None):
+    """Follow directs for the link as long as the redirects are on the given
+    sites and return the resolved link."""
+    def follow(url):
+        return sites == None or urlparse.urlparse(url).hostname in sites
+
+    class RedirectHandler(urllib2.HTTPRedirectHandler):
+        def __init__(self):
+            self.last_url = None
+        def redirect_request(self, req, fp, code, msg, hdrs, newurl):
+            self.last_url = newurl
+            if not follow(newurl):
+                return None
+            r = urllib2.HTTPRedirectHandler.redirect_request(
+                self, req, fp, code, msg, hdrs, newurl)
+            r.get_method = lambda : 'HEAD'
+            return r
+
+    if not follow(link):
+        return link
+    redirect_handler = RedirectHandler()
+    opener = urllib2.build_opener(redirect_handler)
+    req = urllib2.Request(link)
+    req.get_method = lambda : 'HEAD'
+    try:
+        with contextlib.closing(opener.open(req,timeout=1)) as site:
+            return site.url
+    except:
+        return redirect_handler.last_url if redirect_handler.last_url else link
+
+def expand_line(line, sites):
+    """Expand the links in the line for the given sites."""
+    try:
+        l = line.strip()
+        msg_format, links = find_links(l)
+        args = tuple(follow_redirects(l, sites) for l in links)
+        line = msg_format % args
+    except Exception as e:
+        try:
+            err("expanding line %s failed due to %s" % (line, unicode(e)))
+        except:
+            pass
+    return line
+
+def parse_host_list(list_of_hosts):
+    """Parse the comma separated list of hosts."""
+    p = set(
+        m.group(1) for m in re.finditer("\s*([^,\s]+)\s*,?\s*", list_of_hosts))
+    return p
+
+
+def align_text(text, left_margin=17, max_width=160):
+    lines = []
+    for line in text.split('\n'):
+        temp_lines = textwrap.wrap(line, max_width - left_margin)
+        temp_lines = [(' ' * left_margin + line) for line in temp_lines]
+        lines.append('\n'.join(temp_lines))
+    ret = '\n'.join(lines)
+    return ret.lstrip()