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| 106 <li><h2><a href="devguide.html">Developer's Guide</a></h2> | |
| 107 <ul> | |
| 108 <li>Browser UI | |
| 109 <ul> | |
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| 128 <li><a href="windows.html">Windows</a></li> | |
| 129 </ul> | |
| 130 </li> | |
| 131 <li>Implementation | |
| 132 <ul> | |
| 133 <li><a href="a11y.html">Accessibility</a></li> | |
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| 138 <li><a href="messaging.html">Message Passing</a></li> | |
| 139 <li><a href="permissions.html">Optional Permissions</a></li> | |
| 140 <li class="leftNavSelected">NPAPI Plugins</li> | |
| 141 </ul> | |
| 142 </li> | |
| 143 <li>Finishing | |
| 144 <ul> | |
| 145 <li><a href="hosting.html">Hosting</a></li> | |
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| 157 </ul> | |
| 158 </li> | |
| 159 <li><h2>Reference</h2> | |
| 160 <ul> | |
| 161 <li>Formats | |
| 162 <ul> | |
| 163 <li><a href="manifest.html">Manifest Files</a></li> | |
| 164 <li><a href="match_patterns.html">Match Patterns</a></li> | |
| 165 </ul> | |
| 166 </li> | |
| 167 <li><a href="permission_warnings.html">Permission Warnings</a></li
> | |
| 168 <li><a href="api_index.html">chrome.* APIs</a></li> | |
| 169 <li><a href="api_other.html">Other APIs</a></li> | |
| 170 </ul> | |
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| 172 <li><h2><a href="samples.html">Samples</a></h2></li> | |
| 173 <div class="line"> </div> | |
| 174 <li><h2>More</h2> | |
| 175 <ul> | |
| 176 <li><a href="http://code.google.com/chrome/webstore/docs/index.htm
l">Chrome Web Store</a></li> | |
| 177 <li><a href="http://code.google.com/chrome/apps/docs/developers_gu
ide.html">Hosted Apps</a></li> | |
| 178 <li><a href="themes.html">Themes</a></li> | |
| 179 </ul> | |
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| 186 <div class="g-unit" id="gc-pagecontent"> | |
| 187 <div id="pageTitle"> | |
| 188 <h1 class="page_title">NPAPI Plugins</h1> | |
| 189 </div> | |
| 190 <!-- TABLE OF CONTENTS --> | |
| 191 <!-- /TABLE OF CONTENTS --> | |
| 192 <!-- Standard content lead-in for experimental API pages --> | |
| 193 <!-- STATIC CONTENT PLACEHOLDER --> | |
| 194 <div id="static"><div id="pageData-name" class="pageData">NPAPI Plugins<
/div> | |
| 195 <p> | |
| 196 Leveraging HTML and JavaScript | |
| 197 makes developing new extensions really easy, | |
| 198 but what if you have existing legacy or proprietary code | |
| 199 that you want to reuse in your extension? | |
| 200 You can bundle an NPAPI plugin with your extension, | |
| 201 allowing you to call into native binary code from JavaScript. | |
| 202 </p> | |
| 203 <h2>Warning</h2> | |
| 204 <p align="center"><b>NPAPI is a really big hammer that should only be used when
no other approach will work.</b> | |
| 205 </p><p>Code running in an NPAPI plugin has the full permissions of the current u
ser and is not sandboxed or shielded from malicious input by Google Chrome in an
y way. You should be especially cautious when processing input from untrusted so
urces, such as when working with <a href="content_scripts.html#security-consider
ations">content scripts</a> or XMLHttpRequest. | |
| 206 </p><p>Because of the additional security risks NPAPI poses to users, extensions
that use it will require manual review before being accepted in the | |
| 207 <a href="https://chrome.google.com/webstore">Chrome Web Store</a>.</p> | |
| 208 <h2>Details</h2> | |
| 209 <p> | |
| 210 How to develop an NPAPI plugin is outside the scope of this document. | |
| 211 See <a href="https://developer.mozilla.org/en/Plugins">Mozilla's | |
| 212 NPAPI plugin reference</a> for information on how to do that. | |
| 213 </p> | |
| 214 <p> | |
| 215 Once you have an NPAPI plugin, | |
| 216 follow these steps to get your extension using it. | |
| 217 </p> | |
| 218 <ol> | |
| 219 <li> | |
| 220 Add a section to your extension's <code>manifest.json</code> | |
| 221 that describes where to find the plugin, | |
| 222 along with other properties about it: | |
| 223 <pre>{ | |
| 224 "name": "My extension", | |
| 225 ... | |
| 226 <b>"plugins": [ | |
| 227 { "path": "content_plugin.dll", "public": true }, | |
| 228 { "path": "extension_plugin.dll" } | |
| 229 ]</b>, | |
| 230 ... | |
| 231 }</pre> | |
| 232 <p> | |
| 233 The "path" property specifies the path to your plugin, | |
| 234 relative to the manifest file. | |
| 235 The "public" property specifies whether | |
| 236 your plugin can be accessed by regular web pages; | |
| 237 the default is false, | |
| 238 meaning only your extension can load the plugin. | |
| 239 </p> | |
| 240 </li> | |
| 241 <li> | |
| 242 Create an HTML file that loads your plugin by mime-type. | |
| 243 Assuming your mime-type is "application/x-my-extension": | |
| 244 <pre><embed type="application/x-my-extension" id="pluginId"> | |
| 245 <script> | |
| 246 var plugin = document.getElementById("pluginId"); | |
| 247 var result = plugin.myPluginMethod(); // call a method in your plugin | |
| 248 console.log("my plugin returned: " + result); | |
| 249 </script></pre> | |
| 250 <p> | |
| 251 This can be inside a background page | |
| 252 or any other HTML page used by your extension. | |
| 253 If your plugin is "public", | |
| 254 you can even use a content script to programmatically | |
| 255 insert your plugin into a web page. | |
| 256 </p> | |
| 257 </li> | |
| 258 </ol> | |
| 259 <h2 id="security-considerations">Security considerations</h2> | |
| 260 <p> | |
| 261 Including an NPAPI plugin in your extension is dangerous because plugins | |
| 262 have unrestricted access to the local machine. If your plugin contains | |
| 263 a vulnerability, an attacker might be able to exploit that vulnerability | |
| 264 to install malicious software on the user's machine. Instead, avoid | |
| 265 including an NPAPI plugin whenever possible. | |
| 266 </p> | |
| 267 <p> | |
| 268 Marking your NPAPI plugin "public" increase the attack surface of your | |
| 269 extension because the plugin is exposed directly to web content, making | |
| 270 it easier for a malicious web site to manipulate your plugin. Instead, | |
| 271 avoid making your NPAPI plugin public whenever possible. | |
| 272 </p> | |
| 273 </div> | |
| 274 <!-- API PAGE --> | |
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| 284 Attribution 3.0 License</a>, and code samples are licensed under the | |
| 285 <a rel="license" href="http://code.google.com/google_bsd_license.html">BSD Lic
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