<?php
/**
 * https://www.dropbox.com/developers/apply?cont=/developers/apps
 */

if (!defined('UPDRAFTPLUS_DIR')) die('No direct access allowed.');

// Converted to multi-options (Feb 2017-) and previous options conversion removed: Yes

if (!class_exists('UpdraftPlus_BackupModule')) require_once(UPDRAFTPLUS_DIR.'/methods/backup-module.php');

// Fix a potential problem for users who had the short-lived 1.12.35-1.12.38 free versions (see: https://wordpress.org/support/topic/1-12-37-dropbox-auth-broken/page/2/#post-8981457)
// Can be removed after a few months
$potential_options = UpdraftPlus_Options::get_updraft_option('updraft_dropbox');
if (is_array($potential_options) && isset($potential_options['version']) && isset($potential_options['settings']) && array() === $potential_options['settings']) {
	// Wipe it, which will force its re-creation in proper format
	UpdraftPlus_Options::delete_updraft_option('updraft_dropbox');
}

class UpdraftPlus_BackupModule_dropbox extends UpdraftPlus_BackupModule {

	private $current_file_hash;

	private $current_file_size;

	private $uploaded_offset;

	private $upload_tick;

	/**
	 * This callback is called as upload progress is made
	 *
	 * @param Integer		 $offset   - the byte offset
	 * @param String		 $uploadid - identifier for the upload in progress
	 * @param Boolean|String $fullpath - optional full path to the file being uploaded
	 */
	public function chunked_callback($offset, $uploadid, $fullpath = false) {
	
		global $updraftplus;

		$storage = $this->get_storage();

		// Update upload ID
		$this->jobdata_set('upload_id_'.$this->current_file_hash, $uploadid);
		$this->jobdata_set('upload_offset_'.$this->current_file_hash, $offset);

		$time_now = microtime(true);
		
		$time_since_last_tick = $time_now - $this->upload_tick;
		$data_since_last_tick = $offset - $this->uploaded_offset;
		
		$this->upload_tick = $time_now;
		$this->uploaded_offset = $offset;
		
		// Here we use job-wide data, because we don't expect wildly different performance for different Dropbox accounts
		$chunk_size = $updraftplus->jobdata_get('dropbox_chunk_size', 1048576);
		// Don't go beyond 10MB, or change the chunk size after the last segment
		if ($chunk_size < 10485760 && $this->current_file_size > 0 && $offset < $this->current_file_size) {
			$job_run_time = $time_now - $updraftplus->job_time_ms;
			if ($time_since_last_tick < 10) {
				$upload_rate = $data_since_last_tick / max($time_since_last_tick, 1);
				$upload_secs = min(floor($job_run_time), 10);
				if ($job_run_time < 15) $upload_secs = max(6, $job_run_time*0.6);
				$new_chunk = max(min($upload_secs * $upload_rate * 0.9, 10485760), 1048576);
				$new_chunk = $new_chunk - ($new_chunk % 524288);
				$chunk_size = (int) $new_chunk;
				$storage->setChunkSize($chunk_size);
				$updraftplus->jobdata_set('dropbox_chunk_size', $chunk_size);
			}
		}
		
		if ($this->current_file_size > 0) {
			$percent = round(100*($offset/$this->current_file_size), 1);
			$updraftplus->record_uploaded_chunk($percent, "$uploadid, $offset, ".round($chunk_size/1024, 1)." KB", $fullpath);
		} else {
			$this->log("Chunked Upload: $offset bytes uploaded");
			// This act is done by record_uploaded_chunk, and helps prevent overlapping runs
			if ($fullpath) touch($fullpath);
		}
	}

	/**
	 * Supported features
	 *
	 * @return Array
	 */
	public function get_supported_features() {
		// This options format is handled via only accessing options via $this->get_options()
		return array('multi_options', 'config_templates', 'multi_storage', 'conditional_logic', 'manual_authentication');
	}

	/**
	 * Default options
	 *
	 * @return Array
	 */
	public function get_default_options() {
		return array(
			'appkey' => '',
			'secret' => '',
			'folder' => '',
			'tk_access_token' => '',
		);
	}

	/**
	 * Check whether options have been set up by the user, or not
	 *
	 * @param Array $opts - the potential options
	 *
	 * @return Boolean
	 */
	public function options_exist($opts) {
		if (is_array($opts) && !empty($opts['tk_access_token'])) return true;
		return false;
	}

	/**
	 * Acts as a WordPress options filter
	 *
	 * @param  Array $dropbox - An array of Dropbox options
	 * @return Array - the returned array can either be the set of updated Dropbox settings or a WordPress error array
	 */
	public function options_filter($dropbox) {

		// Get the current options (and possibly update them to the new format)
		$opts = UpdraftPlus_Storage_Methods_Interface::update_remote_storage_options_format('dropbox');
		
		if (is_wp_error($opts)) {
			if ('recursion' !== $opts->get_error_code()) {
				$msg = "(".$opts->get_error_code()."): ".$opts->get_error_message();
				$this->log($msg);
				error_log("UpdraftPlus: $msg");
			}
			// The saved options had a problem; so, return the new ones
			return $dropbox;
		}
		
		// If the input is not as expected, then return the current options
		if (!is_array($dropbox)) return $opts;
		
		// Remove instances that no longer exist
		foreach ($opts['settings'] as $instance_id => $storage_options) {
			if (!isset($dropbox['settings'][$instance_id])) unset($opts['settings'][$instance_id]);
		}
		
		// Dropbox has a special case where the settings could be empty so we should check for this before
		if (!empty($dropbox['settings'])) {
		
			foreach ($dropbox['settings'] as $instance_id => $storage_options) {
				if (!empty($opts['settings'][$instance_id]['tk_access_token'])) {
				
					$current_app_key = empty($opts['settings'][$instance_id]['appkey']) ? false : $opts['settings'][$instance_id]['appkey'];
					$new_app_key = empty($storage_options['appkey']) ? false : $storage_options['appkey'];

					// If a different app key is being used, then wipe the stored token as it cannot belong to the new app
					if ($current_app_key !== $new_app_key) {
						unset($opts['settings'][$instance_id]['tk_access_token']);
						unset($opts['settings'][$instance_id]['ownername']);
						unset($opts['settings'][$instance_id]['CSRF']);
					}
				
				}

				// Now loop over the new options, and replace old options with them
				foreach ($storage_options as $key => $value) {
					if (null === $value) {
						unset($opts['settings'][$instance_id][$key]);
					} else {
						if (!isset($opts['settings'][$instance_id])) $opts['settings'][$instance_id] = array();
						$opts['settings'][$instance_id][$key] = $value;
					}
				}
				
				if (!empty($opts['settings'][$instance_id]['folder']) && preg_match('#^https?://(www.)dropbox\.com/home/Apps/UpdraftPlus(.Com)?([^/]*)/(.*)$#i', $opts['settings'][$instance_id]['folder'], $matches)) $opts['settings'][$instance_id]['folder'] = $matches[3];
				
				// check if we have the dummy nosave option and remove it so that it doesn't get saved
				if (isset($opts['settings'][$instance_id]['dummy-nosave'])) unset($opts['settings'][$instance_id]['dummy-nosave']);
			}
			
		}
		
		return $opts;
	}
	
	public function backup($backup_array) {

		global $updraftplus;

		$opts = $this->get_options();
		
		if (empty($opts['tk_access_token'])) {
			$this->log('You do not appear to be authenticated with Dropbox (1)');
			$this->log(__('You do not appear to be authenticated with Dropbox', 'updraftplus'), 'error');
			return false;
		}
		
		// 28 September 2017: APIv1 is gone. We'll keep the variable to make life easier if there's ever an APIv3.
		$use_api_ver = 2;
		
		if (empty($opts['tk_request_token'])) {
			$this->log("begin cloud upload (using API version $use_api_ver with OAuth v2 token)");
		} else {
			$this->log("begin cloud upload (using API version $use_api_ver with OAuth v1 token)");
		}

		$chunk_size = $updraftplus->jobdata_get('dropbox_chunk_size', 1048576);

		try {
			$dropbox = $this->bootstrap();
			if (false === $dropbox) throw new Exception(__('You do not appear to be authenticated with Dropbox', 'updraftplus'));
			$this->log("access gained; setting chunk size to: ".round($chunk_size/1024, 1)." KB");
			$dropbox->setChunkSize($chunk_size);
		} catch (Exception $e) {
			$this->log('error when trying to gain access: '.$e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			$this->log(sprintf(__('error: %s (see log file for more)', 'updraftplus'), $e->getMessage()), 'error');
			return false;
		}

		$updraft_dir = $updraftplus->backups_dir_location();

		foreach ($backup_array as $file) {

			$available_quota = -1;

			// If we experience any failures collecting account info, then carry on anyway
			try {

				/*
					Quota information is no longer provided with account information a new call to quotaInfo must be made to get this information.
				 */
				$quota_info = $dropbox->quotaInfo();

				// Access token expired try to refresh and then call quota info again
				if ("401" == $quota_info['code']) {
					$this->log('HTTP code 401 (unauthorized) code returned from Dropbox; attempting to refresh access token');
					$dropbox->refreshAccessToken();
					$quota_info = $dropbox->quotaInfo();
				}

				if ("200" != $quota_info['code']) {
					$message = "account/info did not return HTTP 200; returned: ". $quota_info['code'];
				} elseif (!isset($quota_info['body'])) {
					$message = "account/info did not return the expected data";
				} else {
					$body = $quota_info['body'];
					if (isset($body->quota_info)) {
						$quota_info = $body->quota_info;
						$total_quota = $quota_info->quota;
						$normal_quota = $quota_info->normal;
						$shared_quota = $quota_info->shared;
						$available_quota = $total_quota - ($normal_quota + $shared_quota);
						$message = "quota usage: normal=".round($normal_quota/1048576, 1)." MB, shared=".round($shared_quota/1048576, 1)." MB, total=".round($total_quota/1048576, 1)." MB, available=".round($available_quota/1048576, 1)." MB";
					} else {
						$total_quota = max($body->allocation->allocated, 1);
						$used = $body->used;
						/* check here to see if the account is a team account and if so use the other used value
						This will give us their total usage including their individual account and team account */
						if (isset($body->allocation->used)) $used = $body->allocation->used;
						$available_quota = $total_quota - $used;
						$message = "quota usage: used=".round($used/1048576, 1)." MB, total=".round($total_quota/1048576, 1)." MB, available=".round($available_quota/1048576, 1)." MB";
					}
				}
				$this->log($message);
			} catch (Exception $e) {
				$this->log("exception (".get_class($e).") occurred whilst getting account info: ".$e->getMessage());
				// $this->log(sprintf(__("%s error: %s", 'updraftplus'), 'Dropbox', $e->getMessage()).' ('.$e->getCode().')', 'warning', md5($e->getMessage()));
			}

			$file_success = 1;

			$hash = md5($file);
			$this->current_file_hash = $hash;

			$filesize = filesize($updraft_dir.'/'.$file);
			$this->current_file_size = $filesize;

			// Into KB
			$filesize = $filesize/1024;
			$microtime = microtime(true);

			if ('None' != ($upload_id = $this->jobdata_get('upload_id_'.$hash, 'None', 'updraf_dbid_'.$hash))) {
				// Resume
				$offset = $this->jobdata_get('upload_offset_'.$hash, 0, 'updraf_dbof_'.$hash);
				if ($offset) $this->log("This is a resumption: $offset bytes had already been uploaded");
			} else {
				$offset = 0;
				$upload_id = 'None';
			}

			// We don't actually abort now - there's no harm in letting it try and then fail
			if (-1 != $available_quota && $available_quota < ($filesize-$offset)) {
				$this->log("File upload expected to fail: file data remaining to upload ($file) size is ".($filesize-$offset)." b (overall file size; .".($filesize*1024)." b), whereas available quota is only $available_quota b");
// $this->log(sprintf(__("Account full: your %s account has only %d bytes left, but the file to be uploaded has %d bytes remaining (total size: %d bytes)",'updraftplus'),'Dropbox', $available_quota, $filesize-$offset, $filesize), 'warning');
			}

			$ufile = apply_filters('updraftplus_dropbox_modpath', $file, $this);

			$this->log("Attempt to upload: $file to: $ufile");

			$this->upload_tick = microtime(true);
			$this->uploaded_offset = $offset;

			try {
				$response = $dropbox->chunkedUpload($updraft_dir.'/'.$file, '', $ufile, true, $offset, $upload_id, array($this, 'chunked_callback'));
				if (empty($response['code']) || "200" != $response['code']) {
					$this->log('Unexpected HTTP code returned from Dropbox: '.$response['code']." (".serialize($response).")");
					if ($response['code'] >= 400) {
						if ($response['code'] == 401) {
							$this->log('HTTP code 401 returned from Dropbox, refreshing access token');
							$dropbox->refreshAccessToken();
						}
						$this->log(sprintf(__('error: failed to upload file to %s (see log file for more)', 'updraftplus'), $file), 'error');
						$file_success = 0;
					} else {
						$this->log(__('did not return the expected response - check your log file for more details', 'updraftplus'), 'warning');
					}
				}
			} catch (Exception $e) {
				$this->log("chunked upload exception (".get_class($e)."): ".$e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
				if (preg_match("/Submitted input out of alignment: got \[(\d+)\] expected \[(\d+)\]/i", $e->getMessage(), $matches)) {
					// Try the indicated offset
					$we_tried = $matches[1];
					$dropbox_wanted = (int) $matches[2];
					$this->log("not yet aligned: tried=$we_tried, wanted=$dropbox_wanted; will attempt recovery");
					$this->uploaded_offset = $dropbox_wanted;
					$upload_id = $this->jobdata_get('upload_id_'.$hash, 'None', 'updraf_dbid_'.$hash);
					try {
						$dropbox->chunkedUpload($updraft_dir.'/'.$file, '', $ufile, true, $dropbox_wanted, $upload_id, array($this, 'chunked_callback'));
					} catch (Exception $e) {
						$msg = $e->getMessage();
						if (preg_match('/Upload with upload_id .* already completed/', $msg)) {
							$this->log('returned an error, but apparently indicating previous success: '.$msg);
						} else {
							$this->log($msg.' (line: '.$e->getLine().', file: '.$e->getFile().')');
							$this->log(sprintf(__('failed to upload file to %s (see log file for more)', 'updraftplus'), $ufile), 'error');
							$file_success = 0;
							if (strpos($msg, 'select/poll returned error') !== false && $this->upload_tick > 0 && time() - $this->upload_tick > 800) {
								UpdraftPlus_Job_Scheduler::reschedule(60);
								$this->log("Select/poll returned after a long time: scheduling a resumption and terminating for now");
								UpdraftPlus_Job_Scheduler::record_still_alive();
								die;
							}
						}
					}
				} else {
					$msg = $e->getMessage();
					if (preg_match('/Upload with upload_id .* already completed/', $msg)) {
						$this->log('returned an error, but apparently indicating previous success: '.$msg);
					} else {
						$this->log(sprintf(__('failed to upload file to %s (see log file for more)', 'updraftplus'), $ufile), 'error');
						$file_success = 0;
						if (strpos($msg, 'select/poll returned error') !== false && $this->upload_tick > 0 && time() - $this->upload_tick > 800) {
							UpdraftPlus_Job_Scheduler::reschedule(60);
							$this->log("Select/poll returned after a long time: scheduling a resumption and terminating for now");
							UpdraftPlus_Job_Scheduler::record_still_alive();
							die;
						}
					}
				}
			}
			if ($file_success) {
				$updraftplus->uploaded_file($file);
				$microtime_elapsed = microtime(true)-$microtime;
				$speedps = ($microtime_elapsed > 0) ? $filesize/$microtime_elapsed : 0;
				$speed = sprintf("%.2d", $filesize)." KB in ".sprintf("%.2d", $microtime_elapsed)."s (".sprintf("%.2d", $speedps)." KB/s)";
				$this->log("File upload success (".$file."): $speed");
				$this->jobdata_delete('upload_id_'.$hash, 'updraf_dbid_'.$hash);
				$this->jobdata_delete('upload_offset_'.$hash, 'updraf_dbof_'.$hash);
			}

		}

		return null;

	}

	/**
	 * This method gets a list of files from the remote stoage that match the string passed in and returns an array of backups
	 *
	 * @param  String $match a substring to require (tested via strpos() !== false)
	 * @return Array
	 */
	public function listfiles($match = 'backup_') {

		$opts = $this->get_options();

		if (empty($opts['tk_access_token'])) return new WP_Error('no_settings', __('No settings were found', 'updraftplus').' (dropbox)');

		try {
			$dropbox = $this->bootstrap();
		} catch (Exception $e) {
			$this->log('access error: '.$e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			return new WP_Error('access_error', $e->getMessage());
		}

		$searchpath = '/'.untrailingslashit(apply_filters('updraftplus_dropbox_modpath', '', $this));

		try {
			/* Some users could have a large amount of backups, the max search is 1000 entries we should continue to search until there are no more entries to bring back. */
			$cursor = '';
			$matches = array();

			while (true) {
				$search = $dropbox->search($match, $searchpath, 1000, $cursor);
				if (empty($search['code']) || 200 != $search['code']) return new WP_Error('response_error', sprintf(__('%s returned an unexpected HTTP response: %s', 'updraftplus'), 'Dropbox', $search['code']), $search['body']);

				if (empty($search['body'])) return array();

				if (isset($search['body']->matches) && is_array($search['body']->matches)) {
					$matches = array_merge($matches, $search['body']->matches);
				} elseif (is_array($search['body'])) {
					$matches = $search['body'];
				} else {
					break;
				}

				if (isset($search['body']->has_more) && true == $search['body']->has_more && isset($search['body']->cursor)) {
					$cursor = $search['body']->cursor;
				} else {
					break;
				}
			}

		} catch (Exception $e) {
			$this->log($e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			// The most likely cause of a search_error is specifying a non-existent path, which should just result in an empty result set.
// return new WP_Error('search_error', $e->getMessage());
			return array();
		}

		$results = array();

		foreach ($matches as $item) {
			$item = $item->metadata;
			if (!is_object($item)) continue;
			if (isset($item->metadata)) $item = $item->metadata; // 2/files/search_v2 has a slightly different output structure compared to 2/files/search model

			if ((!isset($item->size) || $item->size > 0) && 'folder' != $item->{'.tag'} && !empty($item->path_display) && 0 === strpos($item->path_display, $searchpath)) {

				$path = substr($item->path_display, strlen($searchpath));
				if ('/' == substr($path, 0, 1)) $path = substr($path, 1);

				// Ones in subfolders are not wanted
				if (false !== strpos($path, '/')) continue;

				$result = array('name' => $path);
				if (!empty($item->size)) $result['size'] = $item->size;

				$results[] = $result;
			}
		}

		return $results;
	}

	/**
	 * Identification of Dropbox app
	 *
	 * @return Array
	 */
	private function defaults() {
		return apply_filters('updraftplus_dropbox_defaults', array('Z3Q3ZmkwbnplNHA0Zzlx', 'bTY0bm9iNmY4eWhjODRt'));
	}

	/**
	 * Delete files from the service using the Dropbox API
	 *
	 * @param Array $files    - array of filenames to delete
	 * @param Array $data     - unused here
	 * @param Array $sizeinfo - unused here
	 * @return Boolean|String - either a boolean true or an error code string
	 */
	public function delete($files, $data = null, $sizeinfo = array()) {// phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable -- $data and $sizeinfo unused

		if (is_string($files)) $files = array($files);

		$opts = $this->get_options();

		if (empty($opts['tk_access_token'])) {
			$this->log('You do not appear to be authenticated with Dropbox (3)');
			$this->log(sprintf(__('You do not appear to be authenticated with %s (whilst deleting)', 'updraftplus'), 'Dropbox'), 'warning');
			return 'authentication_fail';
		}

		try {
			$dropbox = $this->bootstrap();
		} catch (Exception $e) {
			$this->log($e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			$this->log(sprintf(__('Failed to access %s when deleting (see log file for more)', 'updraftplus'), 'Dropbox'), 'warning');
			return 'service_unavailable';
		}
		if (false === $dropbox) return false;

		$any_failures = false;
		
		foreach ($files as $file) {
			$ufile = apply_filters('updraftplus_dropbox_modpath', $file, $this);
			$this->log("request deletion: $ufile");

			try {
				$dropbox->delete($ufile);
				$file_success = 1;
			} catch (Exception $e) {
				$this->log($e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			}

			if (isset($file_success)) {
				$this->log('deletion succeeded');
			} else {
				$this->log('deletion failed');
				$any_failures = true;
			}
		}
		
		return $any_failures ? 'file_delete_error' : true;

	}

	public function download($file) {

		global $updraftplus;

		$opts = $this->get_options();

		if (empty($opts['tk_access_token'])) {
			$this->log('You do not appear to be authenticated with Dropbox (4)');
			$this->log(sprintf(__('You do not appear to be authenticated with %s', 'updraftplus'), 'Dropbox'), 'error');
			return false;
		}

		try {
			$dropbox = $this->bootstrap();
		} catch (Exception $e) {
			$this->log($e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')');
			$this->log($e->getMessage().' (line: '.$e->getLine().', file: '.$e->getFile().')', 'error');
			return false;
		}
		if (false === $dropbox) return false;
		
		$remote_files = $this->listfiles($file);
		
		foreach ($remote_files as $file_info) {
			if ($file_info['name'] == $file) {
				return $updraftplus->chunked_download($file, $this, $file_info['size'], true, null, 2*1048576);
			}
		}

		$this->log("$file: file not found in listing of remote directory");
		
		return false;
	}

	/**
	 * Callback used by by chunked downloading API
	 *
	 * @param String   $file	- the file (basename) to be downloaded
	 * @param Array	   $headers - supplied headers
	 * @param Mixed	   $data    - pass-back from our call to the API (which we don't use)
	 * @param resource $fh      - the local file handle
	 *
	 * @return String - the data downloaded
	 */
	public function chunked_download($file, $headers, $data, $fh) {// phpcs:ignore Generic.CodeAnalysis.UnusedFunctionParameter.Found

		$opts = $this->get_options();
		$storage = $this->get_storage();

		$try_the_other_one = false;

		$ufile = apply_filters('updraftplus_dropbox_modpath', $file, $this);

		$options = array();
		
		if (!empty($headers)) $options['headers'] = $headers;

		try {
			$get = $storage->download($ufile, $fh, $options);
		} catch (Exception $e) {
			$this->log($e);
			$this->log($e->getMessage(), 'error');
			$get = false;
		}
		
		return $get;
	}

	/**
	 * Get the pre configuration template
	 *
	 * @return String - the template
	 */
	public function get_pre_configuration_template() {

		global $updraftplus_admin;

		$classes = $this->get_css_classes(false);
		
		?>
			<tr class="<?php echo $classes . ' ' . 'dropbox_pre_config_container';?>">
				<td colspan="2">
					<img alt="<?php _e(sprintf(__('%s logo', 'updraftplus'), 'Dropbox')); ?>" src="<?php echo UPDRAFTPLUS_URL.'/images/dropbox-logo.png'; ?>">
					<br>
					<p>
						<?php
							global $updraftplus_admin;
							$updraftplus_admin->curl_check('Dropbox', false, 'dropbox');
						?>
					</p>
					<p>
						<?php echo sprintf(__('Please read %s for use of our %s authorization app (none of your backup data is sent to us).', 'updraftplus'), '<a target="_blank" href="https://updraftplus.com/faqs/what-is-your-privacy-policy-for-the-use-of-your-dropbox-app/">'.__('this privacy policy', 'updraftplus').'</a>', 'Dropbox');?>
					</p>
				</td>
			</tr>

		<?php
	}

	/**
	 * Get the configuration template
	 *
	 * @return String - the template, ready for substitutions to be carried out
	 */
	public function get_configuration_template() {
		ob_start();
		$classes = $this->get_css_classes();

		$defmsg = '<tr class="'.$classes.'"><td></td><td><strong>'.__('Need to use sub-folders?', 'updraftplus').'</strong> '.sprintf(__('Backups are saved in %s.', 'updraftplus'), 'apps/UpdraftPlus').' '.sprintf(__('If you backup several sites into the same Dropbox and want to organize with sub-folders, then %scheck out Premium%s', 'updraftplus'), '<a href="'.apply_filters("updraftplus_com_link", "https://updraftplus.com/shop/").'" target="_blank">', '</a>').'</td></tr>';
				
		$extra_config = apply_filters('updraftplus_dropbox_extra_config_template', $defmsg, $this);
		echo $extra_config;
		?>
			<tr class="<?php echo $classes;?>">
				<th><?php echo sprintf(__('Authenticate with %s', 'updraftplus'), __('Dropbox', 'updraftplus'));?>:</th>
				<td>
					{{#if is_authenticated}}
					<?php
						echo "<p><strong>".__('(You appear to be already authenticated).', 'updraftplus')."</strong>";
						$this->get_deauthentication_link();
						echo '</p>';
					?>
					{{/if}}
					{{#if ownername_sentence}}
						<br/>
						{{ownername_sentence}}
					{{/if}}
					<?php
						echo '<p>';
						$this->get_authentication_link();
						echo '</p>';
					?>			
				</td>
			</tr>
			{{!-- Legacy: only show this next setting to old users who had a setting stored --}}
			{{#if old_user_settings}}
				<tr class="<?php echo $classes;?>">
					<th></th>
					<td>
						<?php echo '<p>'.htmlspecialchars(__('You must add the following as the authorised redirect URI in your Dropbox console (under "API Settings") when asked', 'updraftplus')).': <kbd>'.UpdraftPlus_Options::admin_page_url().'?page=updraftplus&action=updraftmethod-dropbox-auth</kbd></p>'; ?>
					</td>
				</tr>
				<tr class="<?php echo $classes;?>">
					<th>Your Dropbox App Key:</th>
					<td><input type="text" autocomplete="off" style="width:332px" <?php $this->output_settings_field_name_and_id('appkey');?> value="{{appkey}}" /></td>
				</tr>
				<tr class="<?php echo $classes;?>">
					<th>Your Dropbox App Secret:</th>
					<td><input type="text" style="width:332px" <?php $this->output_settings_field_name_and_id('secret');?> value="{{secret}}" /></td>
				</tr>
			{{else}}
			<?php if (false === strpos($extra_config, '<input')) {
				// We need to make sure that it is not the case that the module has no settings whatsoever - this can result in the module being effectively invisible.
				?>
				<input type="hidden" <?php $this->output_settings_field_name_and_id('dummy-nosave');?> value="0">
			<?php } ?>
			{{/if}}
		<?php
		return ob_get_clean();
	}
	
	/**
	 * Modifies handerbar template options
	 *
	 * @param array $opts
	 * @return Array - Modified handerbar template options
	 */
	public function transform_options_for_template($opts) {
		if (!empty($opts['tk_access_token'])) {
			$opts['ownername'] = empty($opts['ownername']) ? '' : $opts['ownername'];
			if ($opts['ownername']) {
				$opts['ownername_sentence']	= sprintf(__("Account holder's name: %s.", 'updraftplus'), $opts['ownername']).' ';
			}
			$opts['is_authenticated'] = true;
		}
		$opts['old_user_settings'] = (!empty($opts['appkey']) || (defined('UPDRAFTPLUS_CUSTOM_DROPBOX_APP') && UPDRAFTPLUS_CUSTOM_DROPBOX_APP));
		if ($opts['old_user_settings']) {
			$opts['appkey'] = empty($opts['appkey']) ? '' : $opts['appkey'];
			$opts['secret'] = empty($opts['secret']) ? '' : $opts['secret'];
		}
		$opts = apply_filters("updraftplus_options_dropbox_options", $opts);
		return $opts;
	}
	
	/**
	 * Gives settings keys which values should not passed to handlebarsjs context.
	 * The settings stored in UD in the database sometimes also include internal information that it would be best not to send to the front-end (so that it can't be stolen by a man-in-the-middle attacker)
	 *
	 * @return Array - Settings array keys which should be filtered
	 */
	public function filter_frontend_settings_keys() {
		return array(
			'CSRF',
			'code',
			'ownername',
			'tk_access_token',
		);
	}

	/**
	 * Over-rides the parent to allow this method to output extra information about using the correct account for OAuth authentication
	 *
	 * @return [boolean] - return false so that no extra information is output
	 */
	public function output_account_warning() {
		return true;
	}

	/**
	 * Handles various URL actions, as indicated by the updraftplus_dropboxauth URL parameter
	 *
	 * @return null
	 */
	public function action_auth() {
		if (isset($_GET['updraftplus_dropboxauth'])) {
			if ('doit' == $_GET['updraftplus_dropboxauth']) {
				$this->action_authenticate_storage();
				return;
			} elseif ('deauth' == $_GET['updraftplus_dropboxauth']) {
				$this->action_deauthenticate_storage();
				return;
			}
		} elseif (isset($_REQUEST['state'])) {

			if ('POST' == $_SERVER['REQUEST_METHOD']) {
				$raw_state = urldecode($_POST['state']);
				if (isset($_POST['code'])) $raw_code = urldecode($_POST['code']);
			} else {
				$raw_state = $_GET['state'];
				if (isset($_GET['code'])) $raw_code = $_GET['code'];
			}

			$this->do_complete_authentication($raw_state, $raw_code);
		}
		try {
			$this->auth_request();
		} catch (Exception $e) {
			$this->log(sprintf(__("%s error: %s", 'updraftplus'), sprintf(__("%s authentication", 'updraftplus'), 'Dropbox'), $e->getMessage()), 'error');
		}
	}

	/**
	 * This function will complete the oAuth flow, if return_instead_of_echo is true then add the action to display the authed admin notice, otherwise echo this notice to page.
	 *
	 * @param string  $raw_state              - the state
	 * @param string  $raw_code               - the oauth code
	 * @param boolean $return_instead_of_echo - a boolean to indicate if we should return the result or echo it
	 *
	 * @return void|string - returns the authentication message if return_instead_of_echo is true
	 */
	public function do_complete_authentication($raw_state, $raw_code, $return_instead_of_echo = false) {
		// Get the CSRF from setting and check it matches the one returned if it does no CSRF attack has happened
		$opts = $this->get_options();
		$csrf = $opts['CSRF'];
		$state = stripslashes($raw_state);
		// Check the state to see if an instance_id has been attached and if it has then extract the state
		$parts = explode(':', $state);
		$state = $parts[0];

		if (strcmp($csrf, $state) == 0) {
			$opts['CSRF'] = '';
			if (isset($raw_code)) {
				// set code so it can be accessed in the next authentication step
				$opts['code'] = stripslashes($raw_code);
				// remove our flag so we know this authentication is complete
				if (isset($opts['auth_in_progress'])) unset($opts['auth_in_progress']);
				$this->set_options($opts, true);
				$auth_result = $this->auth_token($return_instead_of_echo);
				if ($return_instead_of_echo) return $auth_result;
			}
		} else {
			error_log("UpdraftPlus: CSRF comparison failure: $csrf != $state");
		}
	}

	/**
	 * This method will reset any saved options and start the bootstrap process for an authentication
	 *
	 * @param  String $instance_id - the instance id of the settings we want to authenticate
	 */
	public function do_authenticate_storage($instance_id) {
		try {
			// Clear out the existing credentials
			$opts = $this->get_options();
			$opts['tk_access_token'] = '';
			unset($opts['tk_request_token']);
			$opts['ownername'] = '';
			// Set a flag so we know this authentication is in progress
			$opts['auth_in_progress'] = true;
			$this->set_options($opts, true);

			$this->set_instance_id($instance_id);
			$this->bootstrap(false);
		} catch (Exception $e) {
			$this->log(sprintf(__("%s error: %s", 'updraftplus'), sprintf(__("%s authentication", 'updraftplus'), 'Dropbox'), $e->getMessage()), 'error');
		}
	}
	
	/**
	 * This method will start the bootstrap process for a de-authentication
	 *
	 * @param  String $instance_id - the instance id of the settings we want to de-authenticate
	 */
	public function do_deauthenticate_storage($instance_id) {
		try {
			$this->set_instance_id($instance_id);
			$this->bootstrap(true);
		} catch (Exception $e) {
			$this->log(sprintf(__("%s error: %s", 'updraftplus'), sprintf(__("%s de-authentication", 'updraftplus'), 'Dropbox'), $e->getMessage()), 'error');
		}
	}

	/**
	 * This method will setup the authenticated admin warning, it can either return this or echo it
	 *
	 * @param boolean $return_instead_of_echo - a boolean to indicate if we should return the result or echo it
	 *
	 * @return void|string - returns the authentication message if return_instead_of_echo is true
	 */
	public function show_authed_admin_warning($return_instead_of_echo) {
		global $updraftplus_admin;

		$dropbox = $this->bootstrap();
		if (false === $dropbox) return false;

		try {
			$account_info = $dropbox->accountInfo();
		} catch (Exception $e) {
			$accountinfo_err = sprintf(__("%s error: %s", 'updraftplus'), 'Dropbox', $e->getMessage()).' ('.$e->getCode().')';
		}

		$message = "<strong>".__('Success:', 'updraftplus').'</strong> '.sprintf(__('you have authenticated your %s account', 'updraftplus'), 'Dropbox');
		// We log, because otherwise people get confused by the most recent log message of 'Parameter not found: oauth_token' and raise support requests
		$this->log(__('Success:', 'updraftplus').' '.sprintf(__('you have authenticated your %s account', 'updraftplus'), 'Dropbox'));

		if (empty($account_info['code']) || "200" != $account_info['code']) {
			$message .= " (".__('though part of the returned information was not as expected - your mileage may vary', 'updraftplus').") ". $account_info['code'];
			if (!empty($accountinfo_err)) $message .= "<br>".htmlspecialchars($accountinfo_err);
		} else {
			$body = $account_info['body'];
			$name = '';
			if (isset($body->display_name)) {
				$name = $body->display_name;
			} else {
				$name = $body->name->display_name;
			}
			$message .= ". <br>".sprintf(__('Your %s account name: %s', 'updraftplus'), 'Dropbox', htmlspecialchars($name));
			$opts = $this->get_options();
			$opts['ownername'] = $name;
			$this->set_options($opts, true);

			try {
				/**
				 * Quota information is no longer provided with account information a new call to qoutaInfo must be made to get this information. The timeout is because we've seen cases where it returned after 180 seconds (apparently a faulty outgoing proxy), and we may as well wait as cause an error leading to user confusion.
				 */
				$quota_info = $dropbox->quotaInfo(array('timeout' => 190));

				if (empty($quota_info['code']) || "200" != $quota_info['code']) {
					$message .= " (".__('though part of the returned information was not as expected - your mileage may vary', 'updraftplus').")". $quota_info['code'];
					if (!empty($accountinfo_err)) $message .= "<br>".htmlspecialchars($accountinfo_err);
				} else {
					$body = $quota_info['body'];
					if (isset($body->quota_info)) {
						$quota_info = $body->quota_info;
						$total_quota = max($quota_info->quota, 1);
						$normal_quota = $quota_info->normal;
						$shared_quota = $quota_info->shared;
						$available_quota =$total_quota - ($normal_quota + $shared_quota);
						$used_perc = round(($normal_quota + $shared_quota)*100/$total_quota, 1);
						$message .= ' <br>'.sprintf(__('Your %s quota usage: %s %% used, %s available', 'updraftplus'), 'Dropbox', $used_perc, round($available_quota/1048576, 1).' MB');
					} else {
						$total_quota = max($body->allocation->allocated, 1);
						$used = $body->used;
						/* check here to see if the account is a team account and if so use the other used value
						This will give us their total usage including their individual account and team account */
						if (isset($body->allocation->used)) $used = $body->allocation->used;
						$available_quota =$total_quota - $used;
						$used_perc = round($used*100/$total_quota, 1);
						$message .= ' <br>'.sprintf(__('Your %s quota usage: %s %% used, %s available', 'updraftplus'), 'Dropbox', $used_perc, round($available_quota/1048576, 1).' MB');
					}
				}
			} catch (Exception $e) {
				// Catch
			}

		}
		if ($return_instead_of_echo) {
			return "<div class='updraftmessage updated'><p>{$message}</p></div>";
		} else {
			$updraftplus_admin->show_admin_warning($message);
		}

	}

	/**
	 * Bootstrap and check token, can also return the authentication method if return_instead_of_echo is true
	 *
	 * @param boolean $return_instead_of_echo - a boolean to indicate if we should return the result or echo it
	 *
	 * @return void|string - returns the authentication message if return_instead_of_echo is true
	 */
	public function auth_token($return_instead_of_echo) {
		$this->bootstrap();
		$opts = $this->get_options();
		if (!empty($opts['tk_access_token'])) {
			if ($return_instead_of_echo) {
				return $this->show_authed_admin_warning($return_instead_of_echo);
			} else {
				add_action('all_admin_notices', array($this, 'show_authed_admin_warning'));
			}
		}
	}

	/**
	 * Acquire single-use authorization code
	 */
	public function auth_request() {
		$this->bootstrap();
	}

	/**
	 * This basically reproduces the relevant bits of bootstrap.php from the SDK
	 *
	 * @param  Boolean $deauthenticate indicates if we should bootstrap for a deauth or auth request
	 * @return object
	 */
	public function bootstrap($deauthenticate = false) {

		$storage = $this->get_storage();

		if (!empty($storage) && !is_wp_error($storage)) return $storage;

		// Dropbox APIv1 is dead, but we'll keep the variable in case v3 is ever announced
		$dropbox_api = 'Dropbox2';

		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/API.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/Exception.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Consumer/ConsumerAbstract.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Storage/StorageInterface.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Storage/Encrypter.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Storage/WordPress.php');
		include_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Consumer/Curl.php');
		// require_once(UPDRAFTPLUS_DIR.'/includes/'.$dropbox_api.'/OAuth/Consumer/WordPress.php');

		$opts = $this->get_options();

		$key = empty($opts['secret']) ? '' : $opts['secret'];
		$sec = empty($opts['appkey']) ? '' : $opts['appkey'];
		
		$oauth2_id = defined('UPDRAFTPLUS_DROPBOX_CLIENT_ID') ? UPDRAFTPLUS_DROPBOX_CLIENT_ID : base64_decode('dzQxM3o0cWhqejY1Nm5l');

		// Set the callback URL
		$callbackhome = UpdraftPlus_Options::admin_page_url().'?page=updraftplus&action=updraftmethod-dropbox-auth';
		$callback = defined('UPDRAFTPLUS_DROPBOX_AUTH_RETURN_URL') ? UPDRAFTPLUS_DROPBOX_AUTH_RETURN_URL : 'https://auth.updraftplus.com/auth/dropbox/';
		
		$instance_id = $this->get_instance_id();
		// Instantiate the Encrypter and storage objects
		$encrypter = new Dropbox_Encrypter('ThisOneDoesNotMatterBeyondLength');

		// Instantiate the storage
		$dropbox_storage = new Dropbox_WordPress($encrypter, "tk_", 'updraft_dropbox', $this);

		// WordPress consumer does not yet work
		// $oauth = new Dropbox_ConsumerWordPress($sec, $key, $dropbox_storage, $callback);

		// Get the DropBox API access details
		list($d2, $d1) = $this->defaults();
		if (empty($sec)) {
			$sec = base64_decode($d1);
		}

		if (empty($key)) {
			$key = base64_decode($d2);
		}

		$root = 'sandbox';
		if ('dropbox:' == substr($sec, 0, 8)) {
			$sec = substr($sec, 8);
			$root = 'dropbox';
		}
		
		try {
			$oauth = new Dropbox_Curl($sec, $oauth2_id, $key, $dropbox_storage, $callback, $callbackhome, $deauthenticate, $instance_id);
		} catch (Exception $e) {
			$this->log("Curl error: ".$e->getMessage());
			$this->log(sprintf(__("%s error: %s", 'updraftplus'), "Dropbox/Curl", $e->getMessage().' ('.get_class($e).') (line: '.$e->getLine().', file: '.$e->getFile()).')', 'error');
			return false;
		}

		if ($deauthenticate) return true;
		
		$storage = new UpdraftPlus_Dropbox_API($oauth, $root);
		
		$this->set_storage($storage);
		
		return $storage;
	}
}
