From cf14306c2b3f82a81f8d56669a71633b4d4b5fce Mon Sep 17 00:00:00 2001
From: marvin-borner@live.com
Date: Mon, 16 Apr 2018 21:09:05 +0200
Subject: Main merge to user management system - files are now at /main/public/

---
 .../src/Authorize/ParserNodeFunctionEvaluator.php  | 193 +++++++++++++++++++++
 1 file changed, 193 insertions(+)
 create mode 100755 main/app/sprinkles/account/src/Authorize/ParserNodeFunctionEvaluator.php

(limited to 'main/app/sprinkles/account/src/Authorize/ParserNodeFunctionEvaluator.php')

diff --git a/main/app/sprinkles/account/src/Authorize/ParserNodeFunctionEvaluator.php b/main/app/sprinkles/account/src/Authorize/ParserNodeFunctionEvaluator.php
new file mode 100755
index 0000000..e8e5cde
--- /dev/null
+++ b/main/app/sprinkles/account/src/Authorize/ParserNodeFunctionEvaluator.php
@@ -0,0 +1,193 @@
+<?php
+/**
+ * UserFrosting (http://www.userfrosting.com)
+ *
+ * @link      https://github.com/userfrosting/UserFrosting
+ * @license   https://github.com/userfrosting/UserFrosting/blob/master/licenses/UserFrosting.md (MIT License)
+ */
+namespace UserFrosting\Sprinkle\Account\Authorize;
+
+use Monolog\Logger;
+use PhpParser\Node;
+use PhpParser\NodeVisitorAbstract;
+use PhpParser\PrettyPrinter\Standard as StandardPrettyPrinter;
+
+/**
+ * ParserNodeFunctionEvaluator class
+ *
+ * This class parses access control condition expressions.
+ *
+ * @author Alex Weissman (https://alexanderweissman.com)
+ * @see http://www.userfrosting.com/components/#authorization
+ */
+class ParserNodeFunctionEvaluator extends NodeVisitorAbstract
+{
+
+    /**
+     * @var array[callable] An array of callback functions to be used when evaluating a condition expression.
+     */
+    protected $callbacks;
+    /**
+     * @var \PhpParser\PrettyPrinter\Standard The PrettyPrinter object to use (initialized in the ctor)
+     */
+    protected $prettyPrinter;
+    /**
+     * @var array The parameters to be used when evaluating the methods in the condition expression, as an array.
+     */
+    protected $params = [];
+
+    /**
+     * @var Logger
+     */
+    protected $logger;
+
+    /**
+     * @var bool Set to true if you want debugging information printed to the auth log.
+     */
+    protected $debug;
+
+    /**
+     * Create a new ParserNodeFunctionEvaluator object.
+     *
+     * @param array $params The parameters to be used when evaluating the methods in the condition expression, as an array.
+     * @param Logger $logger A Monolog logger, used to dump debugging info for authorization evaluations.
+     * @param bool $debug Set to true if you want debugging information printed to the auth log.
+     */
+    public function __construct($callbacks, $logger, $debug = false)
+    {
+        $this->callbacks = $callbacks;
+        $this->prettyPrinter = new StandardPrettyPrinter;
+        $this->logger        = $logger;
+        $this->debug = $debug;
+        $this->params = [];
+    }
+
+    public function leaveNode(Node $node)
+    {
+        // Look for function calls
+        if ($node instanceof \PhpParser\Node\Expr\FuncCall) {
+            $eval = new \PhpParser\Node\Scalar\LNumber;
+
+            // Get the method name
+            $callbackName = $node->name->toString();
+            // Get the method arguments
+            $argNodes = $node->args;
+
+            $args = [];
+            $argsInfo = [];
+            foreach ($argNodes as $arg) {
+                $argString = $this->prettyPrinter->prettyPrintExpr($arg->value);
+
+                // Debugger info
+                $currentArgInfo = [
+                    'expression' => $argString
+                ];
+                // Resolve parameter placeholders ('variable' names (either single-word or array-dot identifiers))
+                if (($arg->value instanceof \PhpParser\Node\Expr\BinaryOp\Concat) || ($arg->value instanceof \PhpParser\Node\Expr\ConstFetch)) {
+                    $value = $this->resolveParamPath($argString);
+                    $currentArgInfo['type'] = "parameter";
+                    $currentArgInfo['resolved_value'] = $value;
+                // Resolve arrays
+                } elseif ($arg->value instanceof \PhpParser\Node\Expr\Array_) {
+                    $value = $this->resolveArray($arg);
+                    $currentArgInfo['type'] = "array";
+                    $currentArgInfo['resolved_value'] = print_r($value, true);
+                // Resolve strings
+                } elseif ($arg->value instanceof \PhpParser\Node\Scalar\String_) {
+                    $value = $arg->value->value;
+                    $currentArgInfo['type'] = "string";
+                    $currentArgInfo['resolved_value'] = $value;
+                // Resolve numbers
+                } elseif ($arg->value instanceof \PhpParser\Node\Scalar\DNumber) {
+                    $value = $arg->value->value;
+                    $currentArgInfo['type'] = "float";
+                    $currentArgInfo['resolved_value'] = $value;
+                } elseif ($arg->value instanceof \PhpParser\Node\Scalar\LNumber) {
+                    $value = $arg->value->value;
+                    $currentArgInfo['type'] = "integer";
+                    $currentArgInfo['resolved_value'] = $value;
+                // Anything else is simply interpreted as its literal string value
+                } else {
+                    $value = $argString;
+                    $currentArgInfo['type'] = "unknown";
+                    $currentArgInfo['resolved_value'] = $value;
+                }
+
+                $args[] = $value;
+                $argsInfo[] = $currentArgInfo;
+            }
+
+            if ($this->debug) {
+                if (count($args)) {
+                    $this->logger->debug("Evaluating callback '$callbackName' on: ", $argsInfo);
+                } else {
+                    $this->logger->debug("Evaluating callback '$callbackName'...");
+                }
+            }
+
+            // Call the specified access condition callback with the specified arguments.
+            if (isset($this->callbacks[$callbackName]) && is_callable($this->callbacks[$callbackName])) {
+                $result = call_user_func_array($this->callbacks[$callbackName], $args);
+            } else {
+                throw new AuthorizationException("Authorization failed: Access condition method '$callbackName' does not exist.");
+            }
+
+            if ($this->debug) {
+                $this->logger->debug("Result: " . ($result ? "1" : "0"));
+            }
+
+            return new \PhpParser\Node\Scalar\LNumber($result ? "1" : "0");
+        }
+    }
+
+    public function setParams($params)
+    {
+        $this->params = $params;
+    }
+
+    /**
+     * Resolve an array expression in a condition expression into an actual array.
+     *
+     * @param string $arg the array, represented as a string.
+     * @return array[mixed] the array, as a plain ol' PHP array.
+     */
+    private function resolveArray($arg)
+    {
+        $arr = [];
+        $items = (array) $arg->value->items;
+        foreach ($items as $item) {
+            if ($item->key) {
+                $arr[$item->key] = $item->value->value;
+            } else {
+                $arr[] = $item->value->value;
+            }
+        }
+        return $arr;
+    }
+
+    /**
+     * Resolve a parameter path (e.g. "user.id", "post", etc) into its value.
+     *
+     * @param string $path the name of the parameter to resolve, based on the parameters set in this object.
+     * @throws Exception the path could not be resolved.  Path is malformed or key does not exist.
+     * @return mixed the value of the specified parameter.
+     */
+    private function resolveParamPath($path)
+    {
+        $pathTokens = explode(".", $path);
+        $value = $this->params;
+        foreach ($pathTokens as $token) {
+            $token = trim($token);
+            if (is_array($value) && isset($value[$token])) {
+                $value = $value[$token];
+                continue;
+            } elseif (is_object($value) && isset($value->$token)) {
+                $value = $value->$token;
+                continue;
+            } else {
+                throw new AuthorizationException("Cannot resolve the path \"$path\".  Error at token \"$token\".");
+            }
+        }
+        return $value;
+    }
+}
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