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Filename : FreemiusBase.php
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<?php
	/**
	 * Copyright 2014 Freemius, Inc.
	 *
	 * Licensed under the GPL v2 (the "License"); you may
	 * not use this file except in compliance with the License. You may obtain
	 * a copy of the License at
	 *
	 *     http://choosealicense.com/licenses/gpl-v2/
	 *
	 * Unless required by applicable law or agreed to in writing, software
	 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	 * License for the specific language governing permissions and limitations
	 * under the License.
	 */

    if ( ! defined( 'ABSPATH' ) ) {
        exit;
    }

	if ( ! defined( 'FS_API__VERSION' ) ) {
		define( 'FS_API__VERSION', '1' );
	}
	if ( ! defined( 'FS_SDK__PATH' ) ) {
		define( 'FS_SDK__PATH', dirname( __FILE__ ) );
	}
	if ( ! defined( 'FS_SDK__EXCEPTIONS_PATH' ) ) {
		define( 'FS_SDK__EXCEPTIONS_PATH', FS_SDK__PATH . '/Exceptions/' );
	}

	if ( ! function_exists( 'json_decode' ) ) {
		throw new Exception( 'Freemius needs the JSON PHP extension.' );
	}

	// Include all exception files.
	$exceptions = array(
		'Exception',
		'InvalidArgumentException',
		'ArgumentNotExistException',
		'EmptyArgumentException',
		'OAuthException'
	);

	foreach ( $exceptions as $e ) {
		require_once FS_SDK__EXCEPTIONS_PATH . $e . '.php';
	}

	if ( ! class_exists( 'Freemius_Api_Base' ) ) {
        abstract class Freemius_Api_Base {
            const VERSION = '1.0.4';
            const FORMAT = 'json';

            protected $_id;
            protected $_public;
            protected $_secret;
            protected $_scope;
            protected $_isSandbox;

            /**
             * @param string $pScope     'app', 'developer', 'plugin', 'user' or 'install'.
             * @param number $pID        Element's id.
             * @param string $pPublic    Public key.
             * @param string $pSecret    Element's secret key.
             * @param bool   $pIsSandbox Whether or not to run API in sandbox mode.
             */
            public function Init( $pScope, $pID, $pPublic, $pSecret, $pIsSandbox = false ) {
                $this->_id        = $pID;
                $this->_public    = $pPublic;
                $this->_secret    = $pSecret;
                $this->_scope     = $pScope;
                $this->_isSandbox = $pIsSandbox;
            }

            public function IsSandbox() {
                return $this->_isSandbox;
            }

            function CanonizePath( $pPath ) {
                $pPath     = trim( $pPath, '/' );
                $query_pos = strpos( $pPath, '?' );
                $query     = '';

                if ( false !== $query_pos ) {
                    $query = substr( $pPath, $query_pos );
                    $pPath = substr( $pPath, 0, $query_pos );
                }

                // Trim '.json' suffix.
                $format_length = strlen( '.' . self::FORMAT );
                $start         = $format_length * ( - 1 ); //negative
                if ( substr( strtolower( $pPath ), $start ) === ( '.' . self::FORMAT ) ) {
                    $pPath = substr( $pPath, 0, strlen( $pPath ) - $format_length );
                }

                switch ( $this->_scope ) {
                    case 'app':
                        $base = '/apps/' . $this->_id;
                        break;
                    case 'developer':
                        $base = '/developers/' . $this->_id;
                        break;
                    case 'user':
                        $base = '/users/' . $this->_id;
                        break;
                    case 'plugin':
                        $base = '/plugins/' . $this->_id;
                        break;
                    case 'install':
                        $base = '/installs/' . $this->_id;
                        break;
                    default:
                        throw new Freemius_Exception( 'Scope not implemented.' );
                }

                return '/v' . FS_API__VERSION . $base .
                       ( ! empty( $pPath ) ? '/' : '' ) . $pPath .
                       ( ( false === strpos( $pPath, '.' ) ) ? '.' . self::FORMAT : '' ) . $query;
            }

            abstract function MakeRequest( $pCanonizedPath, $pMethod = 'GET', $pParams = array() );

            /**
             * @param string $pPath
             * @param string $pMethod
             * @param array  $pParams
             *
             * @return object[]|object|null
             */
            private function _Api( $pPath, $pMethod = 'GET', $pParams = array() ) {
                $pMethod = strtoupper( $pMethod );

                try {
                    $result = $this->MakeRequest( $pPath, $pMethod, $pParams );
                } catch ( Freemius_Exception $e ) {
                    // Map to error object.
                    $result = (object) $e->getResult();
                } catch ( Exception $e ) {
                    // Map to error object.
                    $result = (object) array(
                        'error' => (object) array(
                            'type'    => 'Unknown',
                            'message' => $e->getMessage() . ' (' . $e->getFile() . ': ' . $e->getLine() . ')',
                            'code'    => 'unknown',
                            'http'    => 402
                        )
                    );
                }

                return $result;
            }

            public function Api( $pPath, $pMethod = 'GET', $pParams = array() ) {
                return $this->_Api( $this->CanonizePath( $pPath ), $pMethod, $pParams );
            }

            /**
             * Base64 decoding that does not need to be urldecode()-ed.
             *
             * Exactly the same as PHP base64 encode except it uses
             *   `-` instead of `+`
             *   `_` instead of `/`
             *   No padded =
             *
             * @param string $input Base64UrlEncoded() string
             *
             * @return string
             */
            protected static function Base64UrlDecode( $input ) {
                /**
                 * IMPORTANT NOTE:
                 * This is a hack suggested by @otto42 and @greenshady from
                 * the theme's review team. The usage of base64 for API
                 * signature encoding was approved in a Slack meeting
                 * held on Tue (10/25 2016).
                 *
                 * @todo Remove this hack once the base64 error is removed from the Theme Check.
                 *
                 * @since 1.2.2
                 * @author Vova Feldman (@svovaf)
                 */
                $fn = 'base64' . '_decode';
                return $fn( strtr( $input, '-_', '+/' ) );
            }

            /**
             * Base64 encoding that does not need to be urlencode()ed.
             *
             * Exactly the same as base64 encode except it uses
             *   `-` instead of `+
             *   `_` instead of `/`
             *
             * @param string $input string
             *
             * @return string Base64 encoded string
             */
            protected static function Base64UrlEncode( $input ) {
                /**
                 * IMPORTANT NOTE:
                 * This is a hack suggested by @otto42 and @greenshady from
                 * the theme's review team. The usage of base64 for API
                 * signature encoding was approved in a Slack meeting
                 * held on Tue (10/25 2016).
                 *
                 * @todo Remove this hack once the base64 error is removed from the Theme Check.
                 *
                 * @since 1.2.2
                 * @author Vova Feldman (@svovaf)
                 */
                $fn = 'base64' . '_encode';
                $str = strtr( $fn( $input ), '+/', '-_' );
                $str = str_replace( '=', '', $str );

                return $str;
            }
        }
    }