3 files changed, 164 insertions, 0 deletions
diff --git a/core/classes/authentication/Core/PasswordTrait.php b/core/classes/authentication/Core/PasswordTrait.php
new file mode 100644
index 0000000..40a7381
--- /dev/null
+++ b/core/classes/authentication/Core/PasswordTrait.php
@@ -0,0 +1,38 @@
+<?php
+/** Trait PasswordTrait
+ * 
+ * @package DevCoder\Authentication\Core
+ * 
+ */
+# namespace DevCoder\Authentication\Core;
+# 
+# use DevCoder\Authentication\UserInterface;
+
+trait PasswordTrait
+{
+    
+    private $cost = 10;     // Cost must be in the range of 4-31
+            // a cost value in the range of 8-11
+            // is a good balance between performance and security
+
+
+    public function cryptPassword(string $plainPassword): string
+    {
+        return password_hash($plainPassword, PASSWORD_BCRYPT, ['cost' => $this->cost]);
+    }
+
+
+    public function isPasswordValid(UserInterface $user, string $plainPassword): bool
+    {
+        return password_verify($plainPassword, $user->getPassword());
+    }
+
+
+    public function setCost(int $cost): void
+    {
+        if ($cost < 4 || $cost > 31) {
+            throw new \InvalidArgumentException('Cost must be in the range of 4-31.');
+        }
+        $this->cost = $cost;
+    }
+}
diff --git a/core/classes/authentication/Core/UserManager.php b/core/classes/authentication/Core/UserManager.php
new file mode 100644
index 0000000..54cd2cb
--- /dev/null
+++ b/core/classes/authentication/Core/UserManager.php
@@ -0,0 +1,101 @@
+<?php
+/** Class UserManager
+ * 
+ * @package DevCoder\Authentication\Core
+ * 
+ */
+# namespace DevCoder\Authentication\Core;
+# 
+# use DevCoder\Authentication\Token\UserToken;
+# use DevCoder\Authentication\Token\UserTokenInterface;
+# use DevCoder\Authentication\UserInterface;
+
+class UserManager implements UserManagerInterface
+{
+
+    use PasswordTrait;
+
+
+    public function __construct()
+    {
+        if (session_status() === PHP_SESSION_NONE) {
+            session_start();
+        }
+    }
+
+
+    /** getUserToken()
+     * == get user from session
+     * 
+     */
+    public function getUserToken(): ?UserTokenInterface
+    {
+        $userToken = null;
+        if ($this->hasUserToken()) {
+            $userToken = unserialize($_SESSION[UserTokenInterface::DEFAULT_PREFIX_KEY]);
+        }
+
+        return $userToken;
+    }
+
+
+    /** hasUserToken()
+     * == is user loged in
+     * 
+     */
+    public function hasUserToken(): bool
+    {
+        $key = UserTokenInterface::DEFAULT_PREFIX_KEY;
+        return (array_key_exists($key, $_SESSION) && unserialize($_SESSION[$key]) !== false);
+    }
+
+
+    /** isGranted
+     * 
+     * checks if user is granded some role(s)
+     * from the array of roles that are passed
+     * 
+     * ex. $token->isGranted(['editor', 'designer']) ...
+     * returns true if the user is editor or designer (or both)
+     * 
+     */
+    public function isGranted(array $roles): bool
+    {
+        // if (!is_null($userToken = $this->getUserToken())) {
+        if (is_null($userToken = $this->getUserToken())) {
+            return false;
+        }
+
+        if ($userToken->getUser() instanceof UserInterface) {
+            return (!empty(array_intersect($roles, $userToken->getUser()->getRoles())));
+        }
+
+        return false;
+    }
+
+
+    /** createUserToken()
+     * == serializes user and stores it into session
+     * so $_SESSION[DEFAULT_PREFIX_KEY] has the serialized representaion of user
+     */
+    public function createUserToken(UserInterface $user): UserTokenInterface
+    {
+        $userToken = new UserToken($user);
+        $_SESSION[UserTokenInterface::DEFAULT_PREFIX_KEY] = $userToken->serialize();
+
+        return $userToken;
+    }
+
+
+    /** logout
+     * == clear session
+     * 
+     */
+    public function logout(): void
+    {
+        if ($this->hasUserToken()) {
+            unset($_SESSION[UserTokenInterface::DEFAULT_PREFIX_KEY]);
+        }
+    }
+
+}
diff --git a/core/classes/authentication/Core/UserManagerInterface.php b/core/classes/authentication/Core/UserManagerInterface.php
new file mode 100644
index 0000000..05110fb
--- /dev/null
+++ b/core/classes/authentication/Core/UserManagerInterface.php
@@ -0,0 +1,25 @@
+<?php
+/** Interface UserManagerInterface
+ * 
+ * @package DevCoder\Authentication\Core
+ * 
+ */
+# namespace DevCoder\Authentication\Core;
+# 
+# use DevCoder\Authentication\Token\UserTokenInterface;
+# use DevCoder\Authentication\UserInterface;
+
+interface UserManagerInterface
+{
+    public function getUserToken(): ?UserTokenInterface;
+
+    public function hasUserToken(): bool;
+
+    public function createUserToken(UserInterface $user): UserTokenInterface;
+
+    public function logout(): void;
+
+    public function cryptPassword(string $plainPassword): string;
+
+    public function isPasswordValid(UserInterface $user, string $plainPassword): bool;
+}