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https://issues.apache.org/jira/browse/WW-5823?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lukasz Lenart reassigned WW-5823:
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Assignee: Lukasz Lenart
> Javatemplates plugin renders dynamic attributes differently from the simple
> theme: values are not HTML-escaped and are evaluated a second time
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: WW-5823
> URL: https://issues.apache.org/jira/browse/WW-5823
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Java Templates
> Reporter: Lukasz Lenart
> Assignee: Lukasz Lenart
> Priority: Major
> Fix For: 6.13.0, 7.5.0
>
>
> The javatemplates plugin is documented as a drop-in replacement for the
> simple theme. {{DynamicAttributesHandler.processDynamicAttributes}} differs
> from the FreeMarker {{dynamic-attributes.ftl}} in two ways.
> # Dynamic attribute values are stored with {{Attributes.put}}. Every other
> handler in the plugin goes through {{Attributes.add}} or {{addIfExists}},
> which apply {{escapeHtml4}}, and the FreeMarker template writes the value
> under the configuration's HTML auto-escaping. {{XHTMLTagSerializer.start}}
> then writes the stored value between double quotes as it is.
> # {{UIBean.setDynamicAttributes}} already translates the percent-brace
> expressions for every component that is not lazily evaluated. The handler
> tests the resolved value with {{ComponentUtils.isExpression}} again and calls
> {{findString}} on it, so a value that resolves to text in the percent-brace
> form is evaluated a second time. The FreeMarker template evaluates only when
> {{evaluate_dynamic_attributes}} is set, which {{radiomap.ftl}} and
> {{checkboxlist.ftl}} do because {{Radio}} and {{CheckboxList}} return
> {{lazyEvaluation() == true}} and render their dynamic attributes per list
> item.
> h2. Observed
> With {{struts.ui.templateSuffix=java}} and the {{hint}} property bound from
> the request:
> {code}<s:textfield name="q" data-hint="%{hint}"/>
> hint = a "b" c java: data-hint="a "b" c" ftl: data-hint="a
> "b" c"
> hint = %{1+1} java: data-hint="2" ftl: data-hint="%{1+1}"
> {code}
> The standard attributes of the same tag ({{value}}, {{title}}) render
> identically under both engines. Every tag wired through
> {{DynamicAttributesHandler}} in {{SimpleTheme}} behaves the same way.
> h2. Proposed change
> * Store dynamic attribute values through {{Attributes.add}}, in line with the
> other handlers and the FreeMarker templates.
> * Evaluate a dynamic attribute in the handler only when the component is
> lazily evaluated. {{UIBean}} already knows this through {{lazyEvaluation()}};
> expose it as a component parameter so the plugin can read it. {{Radio}} and
> {{CheckboxList}} keep their per-item evaluation in the handler chain, where
> {{RadioHandler}} and {{CheckboxListHandler}} push each item before calling
> {{start}}.
> h2. Compatibility
> Under the java engine, a dynamic attribute value is now HTML-escaped once, as
> it already is under the FreeMarker themes; a value that already contains
> entities is escaped again, matching the FreeMarker output. A value that
> resolves to text in the percent-brace form is rendered literally instead of
> being evaluated, matching the FreeMarker output. Lazily evaluated components
> are unchanged.
> h2. Tests
> * A dynamic attribute whose resolved value contains a double quote renders
> escaped under the java engine.
> * A dynamic attribute whose resolved value is in the percent-brace form
> renders literally on a non-lazy component.
> * A dynamic attribute on {{Radio}} is still evaluated per item in the handler.
> * The existing dynamic-attribute rendering tests keep passing for every tag
> in {{SimpleTheme}}.
> Reported by Claude and Ada Logics.
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