1 files changed, 153 insertions, 0 deletions
diff --git a/library/Director/Import/SyncUtils.php b/library/Director/Import/SyncUtils.php
new file mode 100644
index 0000000..5528b2d
--- /dev/null
+++ b/library/Director/Import/SyncUtils.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace Icinga\Module\Director\Import;
+
+use Icinga\Module\Director\Data\Db\DbObject;
+use InvalidArgumentException;
+
+class SyncUtils
+{
+    /**
+     * Extract variable names in the form ${var_name} from a given string
+     *
+     * @param  string $string
+     *
+     * @return array  List of variable names (without ${})
+     */
+    public static function extractVariableNames($string)
+    {
+        if (preg_match_all('/\${([^}]+)}/', $string, $m, PREG_PATTERN_ORDER)) {
+            return $m[1];
+        } else {
+            return array();
+        }
+    }
+
+    /**
+     * Whether the given string contains variable names in the form ${var_name}
+     *
+     * @param  string $string
+     *
+     * @return bool
+     */
+    public static function hasVariables($string)
+    {
+        return preg_match('/\${([^}]+)}/', $string);
+    }
+
+    /**
+     * Recursively extract a value from a nested structure
+     *
+     * For a $val looking like
+     *
+     * { 'vars' => { 'disk' => { 'sda' => { 'size' => '256G' } } } }
+     *
+     * and a key vars.disk.sda given as [ 'vars', 'disk', 'sda' ] this would
+     * return { size => '255GB' }
+     *
+     * @param  string $val  The value to extract data from
+     * @param  array  $keys A list of nested keys pointing to desired data
+     *
+     * @return mixed
+     */
+    public static function getDeepValue($val, array $keys)
+    {
+        $key = array_shift($keys);
+        if (! property_exists($val, $key)) {
+            return null;
+        }
+
+        if (empty($keys)) {
+            return $val->$key;
+        }
+
+        return static::getDeepValue($val->$key, $keys);
+    }
+
+    /**
+     * Return a specific value from a given row object
+     *
+     * Supports also keys pointing to nested structures like vars.disk.sda
+     *
+     * @param  object $row  stdClass object providing property values
+     * @param  string $var  Variable/property name
+     *
+     * @return mixed
+     */
+    public static function getSpecificValue($row, $var)
+    {
+        if (strpos($var, '.') === false) {
+            if ($row instanceof DbObject) {
+                return $row->$var;
+            }
+            if (! property_exists($row, $var)) {
+                return null;
+            }
+
+            return $row->$var;
+        } else {
+            $parts = explode('.', $var);
+            $main = array_shift($parts);
+            if (! property_exists($row, $main)) {
+                return null;
+            }
+            if ($row->$main === null) {
+                return null;
+            }
+
+            if (! is_object($row->$main)) {
+                throw new InvalidArgumentException(sprintf(
+                    'Data is not nested, cannot access %s: %s',
+                    $var,
+                    var_export($row, 1)
+                ));
+            }
+
+            return static::getDeepValue($row->$main, $parts);
+        }
+    }
+
+    /**
+     * Fill variables in the given string pattern
+     *
+     * This replaces all occurrences of ${var_name} with the corresponding
+     * property $row->var_name of the given row object. Missing variables are
+     * replaced by an empty string. This works also fine in case there are
+     * multiple variables to be found in your string.
+     *
+     * @param  string $string String with optional variables/placeholders
+     * @param  object $row    stdClass object providing property values
+     *
+     * @return string
+     */
+    public static function fillVariables($string, $row)
+    {
+        if (preg_match('/^\${([^}]+)}$/', $string, $m)) {
+            return static::getSpecificValue($row, $m[1]);
+        }
+
+        $func = function ($match) use ($row) {
+            return SyncUtils::getSpecificValue($row, $match[1]);
+        };
+
+        return preg_replace_callback('/\${([^}]+)}/', $func, $string);
+    }
+
+    public static function getRootVariables($vars)
+    {
+        $res = array();
+        foreach ($vars as $p) {
+            if (false === ($pos = strpos($p, '.')) || $pos === strlen($p) - 1) {
+                $res[] = $p;
+            } else {
+                $res[] = substr($p, 0, $pos);
+            }
+        }
+
+        if (empty($res)) {
+            return array();
+        }
+
+        return array_combine($res, $res);
+    }
+}