added AMP template filter to replace img tags and strip out the

disallowed HTML. Because somewhere to someone it makes sense to speed up
pages by requiring javascript.

1 files changed, 39 insertions, 0 deletions

diff --git a/app/lib/templatetags/templatetags/amp.py b/app/lib/templatetags/templatetags/amp.py
new file mode 100644
index 0000000..9c6f118
--- /dev/null
+++ b/app/lib/templatetags/templatetags/amp.py
@@ -0,0 +1,39 @@
+from django import template
+from PIL import Image
+from io import BytesIO
+try:
+    import Image
+    import ImageFile
+except ImportError:
+    try:
+        from PIL import Image
+        from PIL import ImageFile
+    except ImportError:
+        raise ImportError("Could not import the Python Imaging Library.")
+
+import requests
+from bs4 import BeautifulSoup
+from builder.sanitizer import Sanitizer
+
+register = template.Library()
+
+
+def remove_img_tags(text):
+    soup = BeautifulSoup(text, 'xml')
+    for img in soup.find_all('img'):
+        r = requests.get(img['src'])
+        i = Image.open(BytesIO(r.content))
+        width, height = i.size
+        try:
+            new_tag = soup.new_tag("amp-img", alt=img["alt"], width=width, height=height, src=img['src'], srcset=img['srcset'])
+        except:
+            new_tag = soup.new_tag("amp-img", alt=img["alt"], width=width, height=height, src=img['src'])
+        img.replace_with(new_tag)
+    return soup.prettify()
+
+
+def do_amp(text):
+    bs = remove_img_tags(text)
+    return Sanitizer().strip(bs)
+
+register.filter('amp', do_amp)