Implementation of core engine components.

src/engine/Core/Controller.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Controller
+ *
+ * @package EA\Engine\Core
+ */
+class Controller extends \CI_Controller {
+
+}

src/engine/Core/Framework.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Framework
+ *
+ * @package EA\Engine\Core
+ */
+class Framework {
+    /**
+     * Get the framework instance.
+     *
+     * @return \CI_Controller
+     */
+    public static function getInstance()
+    {
+        return get_instance();
+    }
+
+    /**
+     * Magit get method that gives access to the internal members of the framework intance.
+     *
+     * @param string $key
+     *
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        return self::getInstance()->$key;
+    }
+}

src/engine/Core/Input.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Input
+ *
+ * @package EA\Engine\Core
+ */
+class Input {
+    /**
+     * @var \EA\Engine\Core\Framework
+     */
+    private $framework;
+
+    /**
+     * Input constructor.
+     *
+     * @param Framework $framework
+     */
+    public function __construct(Framework $framework)
+    {
+        $this->framework = $framework;
+    }
+
+
+    /**
+     * Get request (either GET or POST) parameter (not filtered/escaped).
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    public function request($key)
+    {
+        return isset($_REQUEST[$key]) ? $_REQUEST[$key] : NULL;
+    }
+
+    /**
+     * Get GET parameter value.
+     *
+     * @param string $key
+     */
+    public function get($key)
+    {
+        $this->framework->input->get($key);
+    }
+
+    /**
+     * Get POST parameter value.
+     *
+     * @param string $key
+     */
+    public function post($key)
+    {
+        $this->framework->input->post($key);
+    }
+
+    /**
+     * Get COOKIE parameter value.
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    public function cookie($key)
+    {
+        return $this->framework->input->cookie($key);
+    }
+
+    /**
+     * Get SERVER parameter value.
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    public function server($key)
+    {
+        return $this->framework->input->server($key);
+    }
+
+    /**
+     * Get raw request input.
+     *
+     * @return string
+     */
+    public function raw()
+    {
+        return $this->framework->input->raw_input_stream;
+    }
+
+    /**
+     * Get json decoded raw request input.
+     *
+     * @return string
+     */
+    public function json()
+    {
+        return json_decode($this->framework->input->raw_input_stream);
+    }
+
+    /**
+     * Get request headers as an array.
+     *
+     * @return array
+     */
+    public function headers()
+    {
+        return $this->framework->input->request_headers();
+    }
+
+    /**
+     * Get request header value.
+     *
+     * @param string $key
+     *
+     * @return string
+     */
+    public function header($key)
+    {
+        return $this->framework->input->get_request_header($key);
+    }
+
+    /**
+     * Determine if this is a CLI request or not.
+     *
+     * @return bool
+     */
+    public function isCliRequest()
+    {
+        return $this->framework->is_cli_request();
+    }
+}

src/engine/Core/Migration.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Migration
+ *
+ * @package EA\Engine\Core
+ */
+class Migration extends \CI_Migration {
+
+}

src/engine/Core/Model.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Model
+ *
+ * @package EA\Engine\Core
+ */
+class Model extends \CI_Model {
+
+}

src/engine/Core/Output.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Output
+ *
+ * @package EA\Engine\Core
+ */
+class Output {
+    /**
+     * @var \EA\Engine\Core\Framework
+     */
+    private $framework;
+
+    /**
+     * Output constructor.
+     *
+     * @param Framework $framework
+     */
+    public function __construct(Framework $framework)
+    {
+        $this->framework = $framework;
+    }
+
+    /**
+     * Output HTML markup content.
+     *
+     * @param string $content
+     * @param int $statusCode
+     * @param array $headers
+     */
+    public function html($content, $statusCode = 200, array $headers = [])
+    {
+        $headers[] = 'Content-Type: text/html';
+        $this->write($content, $statusCode, $headers);
+    }
+
+    /**
+     * Output JSON encoded content.
+     *
+     * @param mixed $content
+     * @param int $statusCode
+     * @param array $headers
+     */
+    public function json($content, $statusCode = 200, array $headers = [])
+    {
+        $headers[] = 'Content-Type: application/json; charset=utf-8';
+        $content = json_encode($content, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
+        $this->write($content, $statusCode, $headers);
+    }
+
+    /**
+     * Output arbitrary content with custom status and headers.
+     *
+     * @param string $content
+     * @param int $statusCode
+     * @param array $headers
+     */
+    public function write($content, $statusCode = 200, array $headers = [])
+    {
+        $this->framework->output->set_status_header($statusCode);
+
+        foreach ($headers as $header)
+        {
+            $this->framework->output->set_header($header);
+        }
+
+        $this->framework->output->set_output($content);
+    }
+}

src/engine/Core/QueryBuilder.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class QueryBuilder
+ *
+ * @package EA\Engine\Core
+ */
+class QueryBuilder {
+    /**
+     * @var \EA\Engine\Core\Framework
+     */
+    private $framework;
+
+    /**
+     * QueryBuilder constructor.
+     *
+     * @param \EA\Engine\Core\Framework $framework
+     */
+    public function __construct(Framework $framework)
+    {
+        $this->framework = $framework;
+    }
+
+
+    /**
+     * Count matching query rows.
+     *
+     * @param string $table
+     * @param mixed $conditions
+     *
+     * @return int
+     */
+    public function count($table, $conditions)
+    {
+        return $this->framework->db->get_where($table, $conditions)->num_rows();
+    }
+
+    /**
+     * Perform an arbitrary query to the databbase.
+     *
+     * @param $query
+     *
+     * @return mixed
+     */
+    public function query($query)
+    {
+        return $this->framework->db->query($query);
+    }
+
+    /**
+     * Get a single database row, based on the provided conditions.
+     *
+     * @param string $table
+     * @param mixed $conditions
+     *
+     * @return mixed
+     */
+    public function row($table, $conditions)
+    {
+        return $this->framework->db->get_where($table, $conditions)->row_array();
+    }
+
+    /**
+     * Get a collection of rows, based on the provided parameters.
+     *
+     * @param string $table
+     * @param mixed|null $conditions
+     * @param int|null $limit
+     * @param int|null $offset
+     * @param mixed|null $order
+     *
+     * @return mixed
+     */
+    public function collection($table, $conditions = NULL, $limit = NULL, $offset = NULL, $order = NULL)
+    {
+        if ($limit)
+        {
+            $this->framework->db->limit($limit);
+        }
+
+        if ($limit && $offset)
+        {
+            $this->framework->db->limit($limit, $offset);
+        }
+
+        if ($order)
+        {
+            $this->framework->db->order_by($order);
+        }
+
+        if ($conditions)
+        {
+            $this->framework->db->where($conditions);
+        }
+
+        return $this->framework->db->get($table)->result_array();
+    }
+
+    /**
+     * Insert a new database row.
+     *
+     * @param string $table
+     * @param array $row
+     *
+     * @return int Returns the inserted ID.
+     */
+    public function insert($table, $row)
+    {
+        $this->framework->db->insert($table, $row);
+
+        return $this->framework->db->insert_id();
+    }
+
+    /**
+     * Update an existing database row.
+     *
+     * @param string $table
+     * @param array $row
+     * @param mixed $conditions
+     *
+     * @return mixed Returns the operation result.
+     */
+    public function update($table, $row, $conditions)
+    {
+        return $this->framework->db->update($table, $row, $conditions);
+    }
+
+    /**
+     * Delete an existing database row.
+     *
+     * @param string $table
+     * @param array $row
+     * @param mixed $conditions
+     *
+     * @return mixed
+     */
+    public function delete($table, $row, $conditions)
+    {
+        return $this->framework->db->delete($table, $row, $conditions);
+    }
+
+    /**
+     * Escape a raw value before using it in a query.
+     *
+     * @param string $value
+     *
+     * @return string
+     */
+    public function escape($value)
+    {
+        return $this->framework->db->escape($value);
+    }
+}

src/engine/Core/Session.php

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+<?php
+
+/* ----------------------------------------------------------------------------
+ * Easy!Appointments - Open Source Web Scheduler
+ *
+ * @package     EasyAppointments
+ * @author      A.Tselegidis <alextselegidis@gmail.com>
+ * @copyright   Copyright (c) 2013 - 2018, Alex Tselegidis
+ * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
+ * @link        http://easyappointments.org
+ * @since       v1.4.0
+ * ---------------------------------------------------------------------------- */
+
+namespace EA\Engine\Core;
+
+/**
+ * Class Session
+ *
+ * @package EA\Engine\Core
+ */
+class Session {
+    /**
+     * @var \EA\Engine\Core\Framework
+     */
+    private $framework;
+
+    /**
+     * Session constructor.
+     *
+     * @param Framework $framework
+     */
+    public function __construct(Framework $framework)
+    {
+        $this->framework = $framework;
+    }
+
+
+    /**
+     * Create a new session for the current user.
+     */
+    public function create()
+    {
+        $this->framework->load->library('session');
+    }
+
+    /**
+     * Destroy the session of the current user.
+     */
+    public function destroy()
+    {
+        $this->framework->session->sess_destroy();
+    }
+
+    /**
+     * Get a session value.
+     *
+     * @param string $key
+     *
+     * @return mixed
+     */
+    public function get($key)
+    {
+        return $this->framework->session->userdata($key);
+    }
+
+    /**
+     * Set a session value.
+     *
+     * @param string $key
+     *
+     * @param mixed $value
+     */
+    public function set($key, $value)
+    {
+        $this->framework->session->userdata($key, $value);
+    }
+}