mirror of
https://github.com/phpv8/v8js.git
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145 lines
4.8 KiB
Markdown
145 lines
4.8 KiB
Markdown
V8Js
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====
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V8Js is a PHP extension for Google's V8 Javascript engine.
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The extension allows you to execute Javascript code in a secure sandbox from PHP. The executed code can be restricted using a time limit and/or memory limit. This provides the possibility to execute untrusted code with confidence.
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Minimum requirements
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--------------------
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- V8 Javascript Engine library (libv8) master <https://github.com/v8/v8/> (trunk)
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V8 is Google's open source Javascript engine.
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V8 is written in C++ and is used in Google Chrome, the open source browser from Google.
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V8 implements ECMAScript as specified in ECMA-262, 5th edition.
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This extension makes use of V8 isolates to ensure separation between multiple V8Js instances and already uses the new persistence API, hence the need for 3.21.12 or above.
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- PHP 5.3.3+
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This embedded implementation of the V8 engine uses thread locking so it should work with ZTS enabled.
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However, this has not been tested yet.
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COMPILING LATEST VERSION
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========================
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Compile latest v8
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-----------------
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```
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cd /tmp
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git clone https://github.com/v8/v8.git
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cd v8
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make dependencies
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make native library=shared -j8
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sudo mkdir -p /usr/lib /usr/include
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sudo cp out/native/lib.target/libv8.so /usr/lib/libv8.so
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sudo cp include/v8* /usr/include
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```
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`v8` doesn't support `g++` version 4.8 (yet; see
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<https://code.google.com/p/v8/issues/detail?id=2149>). If your default `g++`
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is version 4.8 you may need to install `g++` 4.7 and replace the `make`
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command above with:
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```
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CXX=g++-4.7 LINK=g++-4.7 make native library=shared -j8
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```
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If you don't want to overwrite the system copy of v8, replace `/usr` in
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the above commands with `/tmp/v8-install` and then add
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`--with-v8js=/tmp/v8-install` to the php-v8js `./configure` command below.
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Compile php-v8js itself
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-----------------------
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```
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cd /tmp
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git clone https://github.com/preillyme/v8js.git
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cd v8js
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phpize
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./configure
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make
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sudo make install
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```
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PHP API
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=======
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class V8Js
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{
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/* Constants */
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const string V8_VERSION;
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const int FLAG_NONE;
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const int FLAG_FORCE_ARRAY;
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/* Methods */
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// Initializes and starts V8 engine and Returns new V8Js object with it's own V8 context.
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public __construct ( [ string $object_name = "PHP" [, array $variables = NULL [, array $extensions = NULL [, bool $report_uncaught_exceptions = TRUE ] ] ] )
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// Provide a function or method to be used to load required modules. This can be any valid PHP callable.
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// The loader function will receive the normalised module path and should return Javascript code to be executed.
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public setModuleLoader ( callable $loader )
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// Compiles and executes script in object's context with optional identifier string.
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// A time limit (milliseconds) and/or memory limit (bytes) can be provided to restrict execution. These options will throw a V8JsTimeLimitException or V8JsMemoryLimitException.
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public mixed V8Js::executeString( string $script [, string $identifier [, int $flags = V8Js::FLAG_NONE [, int $time_limit = 0 [, int $memory_limit = 0]]]])
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// Returns uncaught pending exception or null if there is no pending exception.
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public V8JsScriptException V8Js::getPendingException( )
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/** Static methods **/
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// Registers persistent context independent global Javascript extension.
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// NOTE! These extensions exist until PHP is shutdown and they need to be registered before V8 is initialized.
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// For best performance V8 is initialized only once per process thus this call has to be done before any V8Js objects are created!
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public static bool V8Js::registerExtension( string $extension_name, string $code [, array $dependenciess [, bool $auto_enable = FALSE ] ] )
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// Returns extensions successfully registered with V8Js::registerExtension().
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public static array V8Js::getExtensions( )
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}
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final class V8JsScriptException extends Exception
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{
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/* Properties */
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protected string JsFileName = NULL;
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protected int JsLineNumber = NULL;
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protected string JsSourceLine = NULL;
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protected string JsTrace = NULL;
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/* Methods */
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final public string getJsFileName( )
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final public int getJsLineNumber( )
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final public string getJsSourceLine( )
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final public string getJsTrace( )
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}
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final class V8JsTimeLimitException extends Exception
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{
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}
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final class V8JsMemoryLimitException extends Exception
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{
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}
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Javascript API
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==============
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// Print a string.
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print(string);
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// Dump the contents of a variable.
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var_dump(value);
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// Terminate Javascript execution immediately.
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exit();
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// CommonJS Module support to require external code.
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// This makes use of the PHP module loader provided via V8Js::setModuleLoader (see PHP API above).
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require("path/to/module");
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