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"""A set of basic callbacks for bleach.linkify."""
from __future__ import unicode_literals
def nofollow(attrs, new=False):
href_key = (None, "href")
if href_key not in attrs:
return attrs
if attrs[href_key].startswith("mailto:"):
return attrs
rel_key = (None, "rel")
rel_values = [val for val in attrs.get(rel_key, "").split(" ") if val]
if "nofollow" not in [rel_val.lower() for rel_val in rel_values]:
rel_values.append("nofollow")
attrs[rel_key] = " ".join(rel_values)
return attrs
def target_blank(attrs, new=False):
href_key = (None, "href")
if href_key not in attrs:
return attrs
if attrs[href_key].startswith("mailto:"):
return attrs
attrs[(None, "target")] = "_blank"
return attrs
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