thojanssens1

thojanssens1

Rendering html combined with unsafe data with Phoenix.HTML

Say I have some external (unsafe) data

unsafe_data = "some unsafe data"

I want to render this using Phoenix.HTML.Tag.content_tag/2

content_tag(:p, "<i>#{unsafe_data}</i>") |> safe_to_string

It will render:

"<p>&lt;i&gt;some unsafe data&lt;/i&gt;</p>"

This will create html entities, so <i> will be literally printed on the screen.
So I can use Phoenix.HTML.raw/1:

content_tag(:p, raw "<i>#{unsafe_data}</i>") |> safe_to_string

However, this should not be secure.

Maybe I have to do the following?

unsafe_data = safe_to_string(html_escape(unsafe_data)) # <- does that make any sense?

content_tag(:p, raw "<i>#{unsafe_data}</i>") |> safe_to_string

Thank you for any help!

Marked As Solved

josevalim

josevalim

Creator of Elixir

For this particular example, the best would be:

content_tag(:p, content_tag(:i, unsafe_data))

Alternatively you can put it in a list marking the safe parts:

content_tag(:p, [{:safe, "<i>"}, "<omg>", {:safe, "</i>"}])

Also Liked

OvermindDL1

OvermindDL1

You can also just use the sigil too:

content_tag(:p, ~E"<i><%= unsafe_data %></i>

Or all of it:

~E"<p><i><%= unsafe_data %></i></p>"
derek-zhou

derek-zhou

Phoenix defaults to escape the html to prevent XSS attacks (what if someone embed javascript in the unsafe data?) If you have sanitize it or you have reason to believe that it is clean, just raw/1 it. See the 2 links I cited above.

LostKobrakai

LostKobrakai

<%= raw(@post.body) %>

Last Post!

TwistingTwists

TwistingTwists

strange.

This exact thing was not working yesterday.

now it is working. :slight_smile:

thanks. I feel almost foolish .

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