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Thomas De Schampheleire

templates: narrow down scope of webhelpers.html.literal for HTML injection

When using webhelpers.html.literal to inject some explicit HTML code with
some variable data, there are two approaches:
h.literal('some <html> code with %s data' % foobar)
or
h.literal('some <html> code with %s data') % foobar

In the first case, the literal also applies to the contents of variable
'foobar' which may be influenceable by users and thus potentially malicious.
In the second case, this term will be escaped by webhelpers.

See also the documentation:
https://docs.pylonsproject.org/projects/webhelpers/en/latest/modules/html/builder.html#webhelpers.html.builder.literal
"Also, if you add another string to this string, the other string will
be quoted and you will get back another literal object. Also
literal(...) % obj will quote any value(s) from obj."

In files_browser.html, the correction of this scope of literal() also means
that explicit escaping of node.name can be removed. The escaping is now done
automatically by webhelpers as mentioned above.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" enable-background="new 0 0 163 30" xml:space="preserve" height="30" viewBox="0 0 140 30" width="140" version="1.1" y="0px" x="0px">
  <metadata>
    <rdf:RDF>
      <cc:Work rdf:about="">
        <dc:format>image/svg+xml</dc:format>
        <dc:type rdf:resource="http://purl.org/dc/dcmitype/StillImage"/>
        <dc:title/>
      </cc:Work>
    </rdf:RDF>
  </metadata>
  <g display="none">
    <rect display="inline" height="163" width="256" y="-66.5" x="-24" fill="#404c2c"/>
  </g>
  <g transform="matrix(.83 0 0 1 5.6391 0)">
      <g fill="#b1d579">
        <path d="m26.04 25.875v-20.64l5.451-0.473v21.113h-5.451zm17.215 0h-6.141l-5.451-8.066 5.589-6.704h5.555l-5.555 6.481 6.003 8.289z"/>
        <path d="m58.951 21.592c0 1.141 0.379 1.557 1.242 1.809l-1.138 2.865c-2.174-0.141-3.588-0.668-4.416-2.143-1.311 1.641-3.347 2.225-5.52 2.225-3.657 0-5.969-1.918-5.969-4.617 0-3.227 3.036-4.979 8.59-4.979h1.863v-0.641c0-1.751-0.862-2.28-3.105-2.28-1.173 0-2.967 0.278-4.795 0.779l-1.242-2.893c2.312-0.695 4.83-1.085 6.9-1.085 5.313 0 7.59 1.808 7.59 5.229v5.731zm-5.347 0.194v-2.614h-1.346c-2.484 0-3.691 0.695-3.691 2.169 0 1.169 0.793 1.864 2.139 1.864 1.276 0 2.242-0.529 2.898-1.419z"/>
        <path d="m68.057 21.73c0 0.834 0.345 1.141 0.932 1.141 0.276 0 0.655-0.057 0.897-0.139l1.069 3.115c-0.931 0.305-2.242 0.5-3.519 0.5-3.036 0-4.83-1.447-4.83-4.173v-16.939l5.451-0.473v16.968z"/>
        <path d="m77.785 21.73c0 0.834 0.345 1.141 0.932 1.141 0.276 0 0.655-0.057 0.897-0.139l1.069 3.115c-0.931 0.305-2.242 0.5-3.519 0.5-3.036 0-4.83-1.447-4.83-4.173v-16.939l5.451-0.473v16.968z"/>
        <path d="m88.169 5.819c0 1.418-1.346 2.503-3.243 2.503-1.896 0-3.208-1.085-3.208-2.503 0-1.419 1.312-2.504 3.208-2.504 1.897 0 3.243 1.085 3.243 2.504zm-5.935 20.056v-14.771h5.451v14.771h-5.451z"/>
        <path d="m102.93 25.18c-1.379 0.779-3.312 1.168-4.968 1.168-4.036-0.027-6.003-1.863-6.003-5.341v-6.843h-2.588v-3.06h2.588v-3.199l5.451-0.5v3.7h4.209l-0.587 3.06h-3.622v6.787c0 1.419 0.586 1.92 1.725 1.92 0.621 0 1.242-0.14 1.967-0.501l1.828 2.809z"/>
        <path d="m120.04 15.082v10.793h-5.45v-10.042c0-1.558-0.691-1.975-1.726-1.975-1.208 0-2.208 0.695-3.175 1.892v10.125h-5.45v-20.64l5.45-0.445v7.9c1.483-1.363 3.141-2.059 5.279-2.059 3.174 0 5.072 1.641 5.072 4.451z"/>
        <path d="m139.5 19.783h-11.35c0.379 2.643 1.932 3.365 4.174 3.365 1.484 0 2.795-0.416 4.382-1.308l2.243 2.447c-1.829 1.168-4.176 2.06-7.143 2.06-6.105 0-9.211-3.172-9.211-7.789 0-4.422 3.002-7.928 8.557-7.928 5.242 0 8.451 2.782 8.451 7.566 0.001 0.474-0.033 1.142-0.102 1.587zm-5.244-2.838c-0.034-2.002-0.794-3.394-2.968-3.394-1.793 0-2.896 0.946-3.139 3.589h6.105l0.002-0.195z"/>
        <path d="m156.78 21.592c0 1.141 0.379 1.557 1.242 1.809l-1.139 2.865c-2.175-0.141-3.589-0.668-4.416-2.143-1.312 1.641-3.348 2.225-5.521 2.225-3.658 0-5.97-1.918-5.97-4.617 0-3.227 3.035-4.979 8.59-4.979h1.863v-0.641c0-1.751-0.861-2.28-3.104-2.28-1.172 0-2.968 0.278-4.795 0.779l-1.242-2.893c2.312-0.695 4.83-1.085 6.899-1.085 5.312 0 7.591 1.808 7.591 5.229l0.002 5.731zm-5.347 0.194v-2.614h-1.346c-2.484 0-3.691 0.695-3.691 2.169 0 1.169 0.793 1.864 2.14 1.864 1.275 0 2.24-0.529 2.897-1.419z"/>
      </g>
  </g>
  <g fill="#b1d579">
      <path d="m8.155 18.736c-0.086-0.21-0.048-0.579-0.048-0.579l-0.097-8.098h-1.149l0.098 8.398s-0.034 0.455 0.091 0.709c0.125 0.255 0.413 0.599 0.413 0.599l3.491 3.384s0.107 0.122 0.292 0.486l0.001-1.876-2.884-2.702c0 0.002-0.122-0.11-0.208-0.321z"/>
      <path d="m19.362 23.255c0.088-0.331 0.089-0.608 0.089-0.608l-0.01-2.976h-1.237v3.082s-0.007 0.113-0.069 0.254c-0.063 0.142-0.091 0.173-0.091 0.173l-2.319 2.395h1.569l1.768-1.832c0.001-0.001 0.217-0.17 0.3-0.488z"/>
      <path d="m12.905 15.81c0.18-0.288 0.437-0.463 0.437-0.463l2.998-3.073s0.511-0.461 0.622-0.782c0.108-0.321 0.045-1.436 0.045-1.436l-0.111-6.44h-1.491l0.077 6.441s0.062 0.514 0 0.726-0.294 0.481-0.294 0.481l-3.137 3.212s-0.638 0.705-0.743 0.934c-0.104 0.228-0.057 1.347-0.057 1.347l-0.003 5.005-0.001 1.876-0.002 1.938h1.479l0.051-8.819c-0.002-0.001-0.048-0.66 0.13-0.947z"/>
  </g>
  <g stroke="#b1d579" fill="none" stroke-miterlimit="10">
      <circle cx="18.723" cy="17.973" r="1.698" stroke-width="1.4318"/>
      <circle cx="7.454" cy="7.291" r="2.769" stroke-width="1.7898"/>
  </g>
</svg>