EVOLVE'14 | Enhance | Gabriel Walt | Sightly Component Development

AEM6 Component Development
Adobe Experience Manager
@GabrielWalt, Product Manager

Specification open sourced to GitHub.
Implementation donated to Apache Sling.
Follow @sightlyio on Twitter.
http://docs.adobe.com/docs/en/aem/6-0/develop/sightly.html

Project Efficiency
Adobe.com estimated that it reduced their project
costs by about 25%
JSP Project
Design
HTML/CSS
Template
JSP
Logic
Java
Design
HTML/CSS
Template
Sightly HTML
Logic
Use-API
Project
Management Sightly
Management
~25%
Effort / Cost

Development Workflow
Improves project efficiency by removing the pain of
JSP and Java development
Design
HTML/CSS
Component
Business
Logic
Inefficient
Static HTML being
handed over…
Front-end Developer
– HTML
– CSS/JS
Java Developer
– Java/OSGi
– Business logic

Improves project efficiency by removing the pain of
JSP and Java development
Design
HTML/CSS
Component
Business
Logic
Front-end Developer
– HTML
– CSS/JS
Java Developer
– Java/OSGi
– Business logic
Efficient
APIs to OSGi bundles

Can be edited by front-end devs:
✓ Client Libraries (CSS & JS)
✕ JSP (markup & logic)
✓ HTML markup (Sightly template)
✓ View logic (server-side JS, or Java)
Component

Sightly basic example
<a href="${properties.link || '#'}" title="${properties.jcr:title}">
${properties.jcr:description}
</a>

Sightly basic example
</a>
1︎
2︎ 3︎
1︎ Automatic contextual HTML escaping and XSS protection of all variables
2︎ Fallback value if property is empty
3︎ Remove HTML attribute if value is empty

Sightly VS JSP
Sightly
JSP – Scriptlets
</a>
<%@include file="/libs/foundation/global.jsp"%>
<a href="<%= xssAPI.getValidHref(properties.get("link", "#")) %>" <%
String title = properties.get("jcr:title", "");
if (title.length() > 0) {
%>title="<%= xssAPI.encodeForHTMLAttr(title) %>"<%
} %>>
<%= xssAPI.encodeForHTML(properties.get("jcr:description", "")) %>
</a>
Please try again…

Sightly
</a>
JSP – Expression Language & JSTL
<a href="${!empty properties.link ? xss:href(properties.link) : '#'}"
<c:if test="${!empty properties['jcr:title']}">
title="${xss:attr(properties['jcr:title'])}"
</c:if>
>
${xss:text(properties['jcr:description'])}
</a>
Still complex
Sightly VS JSP
No automatic security

Sightly
</a>
JSP – Custom Tag Libraries
<a href="<out:href property='link' default='#'/>"
No automatic security
<c:if test="${!empty properties['jcr:title']}">
title="<out:attr property='jcr:title'/>"
</c:if>
>
<out:text property='jcr:description'/>
</a>
Many tags within tags
Sightly VS JSP

Sightly
</a>
JSP – TagLibs for whole HTML elements
<my:link
urlProperty="link"
urlDefault="#"
titleProperty="jcr:title">
<my:text property="jcr:description"/>
</my:link>
What does it really do?
Sightly VS JSP

Sightly
</a>
Readable
Explicit
Secure
Sightly FTW!

Building Blocks
Expression Language
${properties.myProperty}
Block Statements
<p data-sly-test="${isVisible}">is visible</p>

Expressions
Literals (positive integers, booleans, strings, arrays)
${42}
${true} ${false}
${'Hello World'} ${"Hello World"}
${[1, 2, 3]} ${[42, true, 'Hello World']}
Variables (and accessing object properties)
${myVar}
${properties.propName}
${properties.jcr:title}
${properties['my property']}
${properties[myVar]}
The available objects are the same ones as in JSP with global.jsp

Expression Operators
Logical operations (not, and, or)
${!myVar}
${conditionOne || conditionTwo}
${conditionOne && conditionTwo}
Equality / Inequality (only for same types)
${varOne == varTwo} ${varOne != varTwo}
Comparison (only for integers)
${varOne < varTwo} ${varOne > varTwo}
${varOne <= varTwo} ${varOne >= varTwo}

Expression Operators
Conditional
${myChoice ? varOne : varTwo}
Grouping
${varOne && (varTwo || varThree)}

Expression Options
Options allow to manipulate the result of an expression,
or to pass parameters to a block statement.
Everything after the @ are comma separated options
${myVar @ optOne, optTwo}
Options can have a value (literals or variables)
${myVar @ optOne='value', optTwo=[1, 2, 3]}
Parametric expression (containing only options)
${@ optOne='value', optTwo=[1, 2, 3]}

Expression Options
String formatting
${'Page {0} of {1}' @ format=[current, total]}
Internationalization
${'Page' @ i18n}
${'Page' @ i18n, hint='Translation Hint'}
${'Page' @ i18n, locale='en-US'}
Array Join
${['one', 'two'] @ join='; '}

Test Statement
Conditionally removes the element and it's content
<p data-sly-test="${properties.showText}">text</p>
Output
<p>text</p>

List Statement
Repeats the content for each enumerable property
<ol data-sly-list="${currentPage.listChildren}">
<li>${item.title}</li>
</ol>
Output
<ol>
<li>Triangle Page</li>
<li>Square Page</li>
</ol>

Include Statement
Includes the rendering of the indicated template (Sightly, JSP, ESP, etc.)
<section data-sly-include="path/to/template.html"></section>
Output
<section></section>

Resource Statement
Includes the result of the indicated resource
<article data-sly-resource="path/to/resource"></article>
Output
<article></article>

Resource Statement Options
Manipulating selectors (selectors, addSelectors, removeSelectors)
<article data-sly-resource="${'path/to/resource' @
selectors='mobile'}"></article>
Overriding the resource type
resourceType='my/resource/type'}"></article>
Changing WCM mode
wcmmode='disabled'}"></article>

Unwrap Statement
Removes the host element while retaining its content
<article data-sly-resource="path/to/resource"
data-sly-unwrap></article>
Output

Use unwrap only when there’s no other way to write your template,
to make it correspond as much as possible to the output.

Text, Attr & Elem Statements
Replaces the content, attribute or element name
<div class="active" title="Lorem ipsum"
data-sly-element="${elementName}"
data-sly-attribute.title="${title}"
data-sly-text="${content}">Lorem ipsum</div>
Output
<span class="active" title="Hi!">Hello World</span>
Use element and attribute with care as they allow to define parts of the
markup from the logic, which can lessen the separation of concerns.

Use Statement
Initializes a helper object
<div data-sly-use.nav="navigation.js">${nav.foo}</div>
Output
<div>Hello World</div>
Use data-sly-use when data preparation is needed.
To avoid unnecessary abstraction layers, prefer to access the variables
directly from the template when possible.

Server-side JavaScript logic

<div data-sly-use.nav="navigation.js">${nav.foo}</div>
/* navigation.js */
use(function () {
return {
foo: "Hello World"
};
});
Like for the Sightly template, the objects available in the logic file are
the same ones as in JSP with global.jsp

<div data-sly-use.nav="Navigation">${nav.foo}</div>
/* Navigation.java */
package apps.site_name.component_name;
import com.adobe.cq.sightly.WCMUse;
public class Navigation extends WCMUse {
private String foo;
@Override
public void activate() throws Exception {
foo = "Hello World";
}
public String getFoo() {
return foo;
}
}
Java logic
When the Java file is
located in the content
repository, next to the
Sightly template, only
the class name is
needed.
But when embedded
in an OSGi bundle, the
fully qualified Java
class name is needed.
The Java class either has to extend WCMUse, or it
has to be adaptable from request or from resource.

What kind of Use-API?
Model logic
This logic is not tied to a template and is potentially reusable among components.
It should aim to form a stable API that changes little, even in case of a full redesign.
➔ Java located in OSGi bundle
View logic
This logic is specific to the templates and is likely to change if the design changes.
It is thus a good practice to locate it in the content repository, next to the template.
➔ JavaScript located in component
If components are to be maintained by front-end devs (typically with Brackets).
➔ Java located in component
If performance is critical (e.g. when many requests are not cached by the dispatcher).

Template & Call Statement

<template data-sly-template.one="${@ class, text}">
<span class="${class}">${text}</span>
</template>

<div data-sly-use.tmpl="template.html"
data-sly-call="${tmpl.one @ class='example',
text='Hi'}"></div>
Output
<div><span class="example">Hi</span></div>

Display Context Option
The context option offers control over escaping and XSS protection.
Allowing some HTML markup (filtering out scripts)
<div>${properties.jcr:description @ context='html'}</div>
Adding URI validation protection to other attributes than src or href
<p data-link="${link @ context='uri'}">text</p>

<a href="${myLink}" title="${myTitle}">${myContent}</a>
<script> var foo = "${myVar @ context='scriptString'}"; </string>
<style> a { font-family: "${myFont @ context='styleString'}"; } </style>
Most useful contexts and what they do:
number XSSAPI.getValidNumber
uri XSSAPI.getValidHref (default for src and href attributes)
attribute XSSAPI.encodeForHTMLAttribute (default for other attributes)
text XSSAPI.encodeForHTML (default for element content)
scriptString XSSAPI.encodeForJSString
styleString XSSAPI.encodeForCSSString
html XSSAPI.filterHTML
unsafe disables all protection, use at your own risk.
safer

<a href="${myLink}" title="${myTitle}">${myContent}</a>
<script> var foo = "${myVar @ context='scriptString'}"; </string>
<style> a { font-family: "${myFont @ context='styleString'}"; } </style>
Preferred method for each context:
– src and href attributes: number, uri, attribute, unsafe
– other attributes: number, uri, attribute, unsafe
– element content: number, text, html, unsafe
– JS scripts ⊛: number, uri, scriptString, unsafe
– CSS styles ⊛: number, uri, styleString, unsafe
⊛ An explicit context is required for script and style contexts.
Don’t set the context manually unless you understand what you are doing.

Sightly FAQ
What does Sightly enable that isn’t possible with JSP?
– Systematic state-of-the-art protection against cross-site scripting injection.
– Possibility for front-end developers to easily participate on AEM projects.
– Flexible and powerful templating and view logic binding features.
– Tailored to the Sling use-case.
Will JSP go away?
– As of today, there are no plans for that.

IDE & Developer Mode
• Improve learning curve and efficiency of developers
• An IDE plugin for each developer role
Brackets plugin
for the Front-End developers
http://docs.adobe.com/docs/en/dev-tools/sightly-brackets.html
Eclipse plugin
for the Java developers
http://docs.adobe.com/docs/en/dev-tools/aem-eclipse.html

Work on file system + transparent sync & content editing
IDE Sync
Version Control
System (Git / Svn) File System
Content
Repository
sync
manual pull
Brackets / Eclipse
IDE
auto push
IDE works on
the File System

Resources
Sightly
– Documentation
– Specification
– Sightly AEM Page Example (requires instance on localhost:4502)
– TodoMVC Example
Tools
– Live Sightly execution environment
– Sightly Brackets extension
– AEM Developer Tools for Eclipse
– AEM Developer Mode

EVOLVE'14 | Enhance | Gabriel Walt | Sightly Component Development

EVOLVE'14 | Enhance | Gabriel Walt | Sightly Component Development

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