[JIRA] Created: (SIDP-543) No support for data URI in combination with MDUI Logo but for mailto?

[Lukas Haemmerle (JIRA)]

No support for data URI in combination with MDUI Logo but for mailto?
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                 Key: SIDP-543
                 URL: https://issues.shibboleth.net/jira/browse/SIDP-543
             Project: Shibboleth IdP 2 - Java
          Issue Type: Improvement
            Reporter: Lukas Haemmerle
            Assignee: Chad La Joie
            Priority: Minor


We are considering to embed MDUI logos in metadata using the data URI. When testing, we noticed that SP and EDS seem to handle embedded logos just fine. However, the IdP won't display the logos on the login.jsp page.

The log says:
{noformat}
WARN [edu.internet2.middleware.shibboleth.idp.ui.ServiceLogoTag:183] - The logo URL data:image/gif;base64,R0lGOD....AAAOw== contained an invalid scheme
{noformat}

The reason is the ServiceLogo class, more specific the code:

{code:java}
            if (!"http".equals(scheme) && !"https".equals(scheme) && !"mailto".equals(scheme)) {
                log.warn("The logo URL " + url + " contained an invalid scheme");
                return null;
            }
{code}

Now the questions are whether the scheme "data:" was excluded on purpose (if so, why?) and why the "mailto:" scheme is allowed on the other hand? The mailto doesn't seem to make sense in an image src attribute.

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