www.gusucode.com > Piwik 网站流量统计系统 v2.9.1PHP源码程序 > Piwik 网站流量统计系统 v2.9.1/piwik/piwik/core/API/Proxy.php
<?php
/**
* Piwik - free/libre analytics platform
*
* @link http://piwik.org
* @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
*
*/
namespace Piwik\API;
use Exception;
use Piwik\Common;
use Piwik\Piwik;
use Piwik\Singleton;
use ReflectionClass;
use ReflectionMethod;
/**
* Proxy is a singleton that has the knowledge of every method available, their parameters
* and default values.
* Proxy receives all the API calls requests via call() and forwards them to the right
* object, with the parameters in the right order.
*
* It will also log the performance of API calls (time spent, parameter values, etc.) if logger available
*
* @method static Proxy getInstance()
*/
class Proxy extends Singleton
{
// array of already registered plugins names
protected $alreadyRegistered = array();
private $metadataArray = array();
private $hideIgnoredFunctions = true;
// when a parameter doesn't have a default value we use this
private $noDefaultValue;
/**
* protected constructor
*/
protected function __construct()
{
$this->noDefaultValue = new NoDefaultValue();
}
/**
* Returns array containing reflection meta data for all the loaded classes
* eg. number of parameters, method names, etc.
*
* @return array
*/
public function getMetadata()
{
ksort($this->metadataArray);
return $this->metadataArray;
}
/**
* Registers the API information of a given module.
*
* The module to be registered must be
* - a singleton (providing a getInstance() method)
* - the API file must be located in plugins/ModuleName/API.php
* for example plugins/Referrers/API.php
*
* The method will introspect the methods, their parameters, etc.
*
* @param string $className ModuleName eg. "API"
*/
public function registerClass($className)
{
if (isset($this->alreadyRegistered[$className])) {
return;
}
$this->includeApiFile($className);
$this->checkClassIsSingleton($className);
$rClass = new ReflectionClass($className);
if(!$this->shouldHideAPIMethod($rClass->getDocComment())) {
foreach ($rClass->getMethods() as $method) {
$this->loadMethodMetadata($className, $method);
}
$this->setDocumentation($rClass, $className);
$this->alreadyRegistered[$className] = true;
}
}
/**
* Will be displayed in the API page
*
* @param ReflectionClass $rClass Instance of ReflectionClass
* @param string $className Name of the class
*/
private function setDocumentation($rClass, $className)
{
// Doc comment
$doc = $rClass->getDocComment();
$doc = str_replace(" * " . PHP_EOL, "<br>", $doc);
// boldify the first line only if there is more than one line, otherwise too much bold
if (substr_count($doc, '<br>') > 1) {
$firstLineBreak = strpos($doc, "<br>");
$doc = "<div class='apiFirstLine'>" . substr($doc, 0, $firstLineBreak) . "</div>" . substr($doc, $firstLineBreak + strlen("<br>"));
}
$doc = preg_replace("/(@package)[a-z _A-Z]*/", "", $doc);
$doc = preg_replace("/(@method).*/", "", $doc);
$doc = str_replace(array("\t", "\n", "/**", "*/", " * ", " *", " ", "\t*", " * @package"), " ", $doc);
$this->metadataArray[$className]['__documentation'] = $doc;
}
/**
* Returns number of classes already loaded
* @return int
*/
public function getCountRegisteredClasses()
{
return count($this->alreadyRegistered);
}
/**
* Will execute $className->$methodName($parametersValues)
* If any error is detected (wrong number of parameters, method not found, class not found, etc.)
* it will throw an exception
*
* It also logs the API calls, with the parameters values, the returned value, the performance, etc.
* You can enable logging in config/global.ini.php (log_api_call)
*
* @param string $className The class name (eg. API)
* @param string $methodName The method name
* @param array $parametersRequest The parameters pairs (name=>value)
*
* @return mixed|null
* @throws Exception|\Piwik\NoAccessException
*/
public function call($className, $methodName, $parametersRequest)
{
$returnedValue = null;
// Temporarily sets the Request array to this API call context
$saveGET = $_GET;
$saveQUERY_STRING = @$_SERVER['QUERY_STRING'];
foreach ($parametersRequest as $param => $value) {
$_GET[$param] = $value;
}
try {
$this->registerClass($className);
// instanciate the object
$object = $className::getInstance();
// check method exists
$this->checkMethodExists($className, $methodName);
// get the list of parameters required by the method
$parameterNamesDefaultValues = $this->getParametersList($className, $methodName);
// load parameters in the right order, etc.
$finalParameters = $this->getRequestParametersArray($parameterNamesDefaultValues, $parametersRequest);
// allow plugins to manipulate the value
$pluginName = $this->getModuleNameFromClassName($className);
/**
* Triggered before an API request is dispatched.
*
* This event can be used to modify the arguments passed to one or more API methods.
*
* **Example**
*
* Piwik::addAction('API.Request.dispatch', function (&$parameters, $pluginName, $methodName) {
* if ($pluginName == 'Actions') {
* if ($methodName == 'getPageUrls') {
* // ... do something ...
* } else {
* // ... do something else ...
* }
* }
* });
*
* @param array &$finalParameters List of parameters that will be passed to the API method.
* @param string $pluginName The name of the plugin the API method belongs to.
* @param string $methodName The name of the API method that will be called.
*/
Piwik::postEvent('API.Request.dispatch', array(&$finalParameters, $pluginName, $methodName));
/**
* Triggered before an API request is dispatched.
*
* This event exists for convenience and is triggered directly after the {@hook API.Request.dispatch}
* event is triggered. It can be used to modify the arguments passed to a **single** API method.
*
* _Note: This is can be accomplished with the {@hook API.Request.dispatch} event as well, however
* event handlers for that event will have to do more work._
*
* **Example**
*
* Piwik::addAction('API.Actions.getPageUrls', function (&$parameters) {
* // force use of a single website. for some reason.
* $parameters['idSite'] = 1;
* });
*
* @param array &$finalParameters List of parameters that will be passed to the API method.
*/
Piwik::postEvent(sprintf('API.%s.%s', $pluginName, $methodName), array(&$finalParameters));
// call the method
$returnedValue = call_user_func_array(array($object, $methodName), $finalParameters);
$endHookParams = array(
&$returnedValue,
array('className' => $className,
'module' => $pluginName,
'action' => $methodName,
'parameters' => $finalParameters)
);
/**
* Triggered directly after an API request is dispatched.
*
* This event exists for convenience and is triggered immediately before the
* {@hook API.Request.dispatch.end} event. It can be used to modify the output of a **single**
* API method.
*
* _Note: This can be accomplished with the {@hook API.Request.dispatch.end} event as well,
* however event handlers for that event will have to do more work._
*
* **Example**
*
* // append (0 hits) to the end of row labels whose row has 0 hits
* Piwik::addAction('API.Actions.getPageUrls', function (&$returnValue, $info)) {
* $returnValue->filter('ColumnCallbackReplace', 'label', function ($label, $hits) {
* if ($hits === 0) {
* return $label . " (0 hits)";
* } else {
* return $label;
* }
* }, null, array('nb_hits'));
* }
*
* @param mixed &$returnedValue The API method's return value. Can be an object, such as a
* {@link Piwik\DataTable DataTable} instance.
* could be a {@link Piwik\DataTable DataTable}.
* @param array $extraInfo An array holding information regarding the API request. Will
* contain the following data:
*
* - **className**: The namespace-d class name of the API instance
* that's being called.
* - **module**: The name of the plugin the API request was
* dispatched to.
* - **action**: The name of the API method that was executed.
* - **parameters**: The array of parameters passed to the API
* method.
*/
Piwik::postEvent(sprintf('API.%s.%s.end', $pluginName, $methodName), $endHookParams);
/**
* Triggered directly after an API request is dispatched.
*
* This event can be used to modify the output of any API method.
*
* **Example**
*
* // append (0 hits) to the end of row labels whose row has 0 hits for any report that has the 'nb_hits' metric
* Piwik::addAction('API.Actions.getPageUrls', function (&$returnValue, $info)) {
* // don't process non-DataTable reports and reports that don't have the nb_hits column
* if (!($returnValue instanceof DataTableInterface)
* || in_array('nb_hits', $returnValue->getColumns())
* ) {
* return;
* }
*
* $returnValue->filter('ColumnCallbackReplace', 'label', function ($label, $hits) {
* if ($hits === 0) {
* return $label . " (0 hits)";
* } else {
* return $label;
* }
* }, null, array('nb_hits'));
* }
*
* @param mixed &$returnedValue The API method's return value. Can be an object, such as a
* {@link Piwik\DataTable DataTable} instance.
* @param array $extraInfo An array holding information regarding the API request. Will
* contain the following data:
*
* - **className**: The namespace-d class name of the API instance
* that's being called.
* - **module**: The name of the plugin the API request was
* dispatched to.
* - **action**: The name of the API method that was executed.
* - **parameters**: The array of parameters passed to the API
* method.
*/
Piwik::postEvent('API.Request.dispatch.end', $endHookParams);
// Restore the request
$_GET = $saveGET;
$_SERVER['QUERY_STRING'] = $saveQUERY_STRING;
} catch (Exception $e) {
$_GET = $saveGET;
throw $e;
}
return $returnedValue;
}
/**
* Returns the parameters names and default values for the method $name
* of the class $class
*
* @param string $class The class name
* @param string $name The method name
* @return array Format array(
* 'testParameter' => null, // no default value
* 'life' => 42, // default value = 42
* 'date' => 'yesterday',
* );
*/
public function getParametersList($class, $name)
{
return $this->metadataArray[$class][$name]['parameters'];
}
/**
* Check if given method name is deprecated or not.
*/
public function isDeprecatedMethod($class, $methodName)
{
return $this->metadataArray[$class][$methodName]['isDeprecated'];
}
/**
* Returns the 'moduleName' part of '\\Piwik\\Plugins\\moduleName\\API'
*
* @param string $className "API"
* @return string "Referrers"
*/
public function getModuleNameFromClassName($className)
{
return str_replace(array('\\Piwik\\Plugins\\', '\\API'), '', $className);
}
public function isExistingApiAction($pluginName, $apiAction)
{
$namespacedApiClassName = "\\Piwik\\Plugins\\$pluginName\\API";
$api = $namespacedApiClassName::getInstance();
return method_exists($api, $apiAction);
}
public function buildApiActionName($pluginName, $apiAction)
{
return sprintf("%s.%s", $pluginName, $apiAction);
}
/**
* Sets whether to hide '@ignore'd functions from method metadata or not.
*
* @param bool $hideIgnoredFunctions
*/
public function setHideIgnoredFunctions($hideIgnoredFunctions)
{
$this->hideIgnoredFunctions = $hideIgnoredFunctions;
// make sure metadata gets reloaded
$this->alreadyRegistered = array();
$this->metadataArray = array();
}
/**
* Returns an array containing the values of the parameters to pass to the method to call
*
* @param array $requiredParameters array of (parameter name, default value)
* @param array $parametersRequest
* @throws Exception
* @return array values to pass to the function call
*/
private function getRequestParametersArray($requiredParameters, $parametersRequest)
{
$finalParameters = array();
foreach ($requiredParameters as $name => $defaultValue) {
try {
if ($defaultValue instanceof NoDefaultValue) {
$requestValue = Common::getRequestVar($name, null, null, $parametersRequest);
} else {
try {
if ($name == 'segment' && !empty($parametersRequest['segment'])) {
// segment parameter is an exception: we do not want to sanitize user input or it would break the segment encoding
$requestValue = ($parametersRequest['segment']);
} else {
$requestValue = Common::getRequestVar($name, $defaultValue, null, $parametersRequest);
}
} catch (Exception $e) {
// Special case: empty parameter in the URL, should return the empty string
if (isset($parametersRequest[$name])
&& $parametersRequest[$name] === ''
) {
$requestValue = '';
} else {
$requestValue = $defaultValue;
}
}
}
} catch (Exception $e) {
throw new Exception(Piwik::translate('General_PleaseSpecifyValue', array($name)));
}
$finalParameters[] = $requestValue;
}
return $finalParameters;
}
/**
* Includes the class API by looking up plugins/UserSettings/API.php
*
* @param string $fileName api class name eg. "API"
* @throws Exception
*/
private function includeApiFile($fileName)
{
$module = self::getModuleNameFromClassName($fileName);
$path = PIWIK_INCLUDE_PATH . '/plugins/' . $module . '/API.php';
if (is_readable($path)) {
require_once $path; // prefixed by PIWIK_INCLUDE_PATH
} else {
throw new Exception("API module $module not found.");
}
}
/**
* @param string $class name of a class
* @param ReflectionMethod $method instance of ReflectionMethod
*/
private function loadMethodMetadata($class, $method)
{
if (!$this->checkIfMethodIsAvailable($method)) {
return;
}
$name = $method->getName();
$parameters = $method->getParameters();
$docComment = $method->getDocComment();
$aParameters = array();
foreach ($parameters as $parameter) {
$nameVariable = $parameter->getName();
$defaultValue = $this->noDefaultValue;
if ($parameter->isDefaultValueAvailable()) {
$defaultValue = $parameter->getDefaultValue();
}
$aParameters[$nameVariable] = $defaultValue;
}
$this->metadataArray[$class][$name]['parameters'] = $aParameters;
$this->metadataArray[$class][$name]['numberOfRequiredParameters'] = $method->getNumberOfRequiredParameters();
$this->metadataArray[$class][$name]['isDeprecated'] = false !== strstr($docComment, '@deprecated');
}
/**
* Checks that the method exists in the class
*
* @param string $className The class name
* @param string $methodName The method name
* @throws Exception If the method is not found
*/
private function checkMethodExists($className, $methodName)
{
if (!$this->isMethodAvailable($className, $methodName)) {
throw new Exception(Piwik::translate('General_ExceptionMethodNotFound', array($methodName, $className)));
}
}
/**
* @param $docComment
* @return bool
*/
public function shouldHideAPIMethod($docComment)
{
$hideLine = strstr($docComment, '@hide');
if ($hideLine === false) {
return false;
}
$hideLine = trim($hideLine);
$hideLine .= ' ';
$token = trim(strtok($hideLine, " "), "\n");
$hide = false;
if (!empty($token)) {
/**
* This event exists for checking whether a Plugin API class or a Plugin API method tagged
* with a `@hideXYZ` should be hidden in the API listing.
*
* @param bool &$hide whether to hide APIs tagged with $token should be displayed.
*/
Piwik::postEvent(sprintf('API.DocumentationGenerator.%s', $token), array(&$hide));
}
return $hide;
}
/**
* @param ReflectionMethod $method
* @return bool
*/
protected function checkIfMethodIsAvailable(ReflectionMethod $method)
{
if (!$method->isPublic() || $method->isConstructor() || $method->getName() === 'getInstance') {
return false;
}
if ($this->hideIgnoredFunctions && false !== strstr($method->getDocComment(), '@ignore')) {
return false;
}
if ($this->shouldHideAPIMethod($method->getDocComment())) {
return false;
}
return true;
}
/**
* Returns the number of required parameters (parameters without default values).
*
* @param string $class The class name
* @param string $name The method name
* @return int The number of required parameters
*/
private function getNumberOfRequiredParameters($class, $name)
{
return $this->metadataArray[$class][$name]['numberOfRequiredParameters'];
}
/**
* Returns true if the method is found in the API of the given class name.
*
* @param string $className The class name
* @param string $methodName The method name
* @return bool
*/
private function isMethodAvailable($className, $methodName)
{
return isset($this->metadataArray[$className][$methodName]);
}
/**
* Checks that the class is a Singleton (presence of the getInstance() method)
*
* @param string $className The class name
* @throws Exception If the class is not a Singleton
*/
private function checkClassIsSingleton($className)
{
if (!method_exists($className, "getInstance")) {
throw new Exception("$className that provide an API must be Singleton and have a 'public static function getInstance()' method.");
}
}
}
/**
* To differentiate between "no value" and default value of null
*
*/
class NoDefaultValue
{
}