sg101: core/mdexts/ssl_images.py annotate

Add a Markdown extension to only allow https based <img> tags. This is not yet "turned on" in the site's markup system.

rev	line source
bgneal@883	1 """
bgneal@883	2 A python-markdown extension to turn <img> tags with http: source attributes into
bgneal@883	3 <a> tags.
bgneal@883	4 """
bgneal@883	5 from urlparse import urlparse
bgneal@883	6
bgneal@883	7 import markdown
bgneal@883	8
bgneal@883	9
bgneal@883	10 class SslImagesTreeprocessor(markdown.treeprocessors.Treeprocessor):
bgneal@883	11
bgneal@883	12 def run(self, root):
bgneal@883	13 for node in root.iter('img'):
bgneal@883	14 src = node.get('src')
bgneal@883	15 if src:
bgneal@883	16 url = urlparse(src)
bgneal@883	17 if url.scheme == 'http':
bgneal@883	18 node.clear()
bgneal@883	19 node.tag = 'a'
bgneal@883	20 node.text = 'Click for image'
bgneal@883	21 node.set('href', url.geturl())
bgneal@883	22
bgneal@883	23
bgneal@883	24 class SslImagesExtension(markdown.Extension):
bgneal@883	25
bgneal@883	26 def extendMarkdown(self, md, md_globals):
bgneal@883	27 tree_proc = SslImagesTreeprocessor()
bgneal@883	28 md.treeprocessors.add('ssl_images', tree_proc, '>inline')

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