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<?php namespace Simondubois\UnsplashDownloader; |
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/** |
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* A task to download photos from Unsplash. Steps are |
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* - list photos |
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* - download photos |
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*/ |
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class Task |
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{ |
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// |
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// Constants |
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// |
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/** |
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* Notification types |
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*/ |
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const NOTIFY_INFO = 'info'; |
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const NOTIFY_COMMENT = 'comment'; |
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const NOTIFY_ERROR = 'error'; |
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/** |
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* Download status |
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*/ |
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const DOWNLOAD_SUCCESS = 0; |
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const DOWNLOAD_SKIPPED = 1; |
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const DOWNLOAD_FAILED = 2; |
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// |
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// Attributes |
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// |
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/** |
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* History proxy |
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* @var History |
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*/ |
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private $history; |
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/** |
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* Callback to call when notification arised : function ($message, $level = null) {}; |
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* @var callable |
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*/ |
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private $notificationCallback; |
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/** |
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* Path where to download photos |
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* @var string |
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*/ |
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private $destination; |
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/** |
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* Number of photos to download |
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* @var int |
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*/ |
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private $quantity; |
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/** |
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* Category ID |
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* @var int |
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*/ |
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private $category; |
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/** |
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* True if the task should only download featured photos |
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* @var bool |
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*/ |
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private $featured; |
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// |
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// Getters |
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// |
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/** |
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* Get history proxy attribute. Instantiate it if null |
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* @return History Instance |
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*/ |
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public function getHistoryInstance() |
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{ |
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if (is_null($this->history)) { |
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$this->history = new History(); |
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} |
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return $this->history; |
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} |
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/** |
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* Get notification callback attribute |
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* @return callable function ($message, $level = null) {} |
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*/ |
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public function getNotificationCallback() |
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{ |
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return $this->notificationCallback; |
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} |
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/** |
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* Get destination attribute |
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* @return string Path to folder |
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*/ |
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public function getDestination() |
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{ |
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return $this->destination; |
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} |
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/** |
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* Get quantity attribute |
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* @return int Number of photos to download |
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*/ |
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public function getQuantity() |
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{ |
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return $this->quantity; |
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} |
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/** |
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* Get category attribute |
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* @return int Category ID |
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*/ |
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public function getCategory() |
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{ |
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return $this->category; |
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} |
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/** |
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* Get featured attribute |
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* @return bool True if the task should only download featured photos |
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*/ |
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public function getFeatured() |
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{ |
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return $this->featured; |
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} |
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/** |
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* Get history path attribute |
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* @return string Path to file |
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*/ |
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public function getHistory() |
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{ |
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return $this->history->getPath(); |
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} |
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// |
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// Setters |
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// |
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/** |
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* Task constructor (set non scalar attributes) |
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*/ |
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public function __construct() |
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{ |
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$this->history = $this->getHistoryInstance(); |
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$this->notificationCallback = function($message, $level = null) {}; |
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} |
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/** |
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* Set notification callback attribute |
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* @param callable $notificationCallback function ($message, $level = null) {} |
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*/ |
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public function setNotificationCallback($notificationCallback) |
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{ |
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$this->notificationCallback = $notificationCallback; |
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} |
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/** |
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* Set destination attribute |
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* @param string $destination Path to folder |
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*/ |
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public function setDestination($destination) |
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{ |
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$this->destination = $destination; |
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} |
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/** |
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* Set quantity attribute |
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* @param int $quantity Number of photos to download |
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*/ |
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public function setQuantity($quantity) |
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{ |
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$this->quantity = $quantity; |
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} |
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/** |
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* Set category attribute |
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* @param int $category Number of photos to download |
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*/ |
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public function setCategory($category) |
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{ |
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$this->category = $category; |
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} |
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/** |
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* Set featured attribute |
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* @param bool $featured True if the task should only download featured photos |
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*/ |
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public function setFeatured($featured) |
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{ |
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$this->featured = $featured; |
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} |
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/** |
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* Set path attribute in history instance |
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* @param string $history Path to file |
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*/ |
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public function setHistory($history) |
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{ |
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$this->history->load($history); |
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} |
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// |
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// Notification |
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// |
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/** |
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* Call the notification callback when a notification arised |
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* @param string $message Message text |
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* @param string|null $level Message context |
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*/ |
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public function notify($message, $level = null) |
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{ |
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$callback = $this->notificationCallback; |
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call_user_func($callback, $message, $level); |
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} |
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// |
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// Execution |
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// |
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/** |
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* Find photos and download them |
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* @return bool True if the execution is successful |
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*/ |
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public function download() |
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{ |
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$unsplash = new Unsplash(); |
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$photos = $this->getPhotos($unsplash); |
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$success = $this->downloadAllPhotos($photos); |
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$this->history->save(); |
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return $success; |
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} |
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/** |
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* List categories |
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* @return bool True if the execution is successful |
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*/ |
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public function categories() |
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{ |
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$unsplash = new Unsplash(); |
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return $this->listCategories($unsplash); |
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} |
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/** |
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* Request APi to get photos to downloads |
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* @param Unsplash $unsplash Proxy to Unsplash API |
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* @return string[] Photo download links indexed by ID |
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*/ |
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public function getPhotos(Unsplash $unsplash) { |
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$this->notify('Get photo list from unsplash... '); |
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if ($this->featured) { |
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$photos = $unsplash->featuredPhotos($this->quantity); |
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} elseif (is_int($this->category)) { |
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$photos = $unsplash->photosInCategory($this->quantity, $this->category); |
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} else { |
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$photos = $unsplash->allPhotos($this->quantity); |
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} |
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$this->notify('success.'.PHP_EOL, 'info'); |
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return $photos; |
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} |
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/** |
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* Download all photos |
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* @param string[] $photos Photo download links indexed by ID |
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* @return boolean True if all downloads are successful |
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*/ |
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public function downloadAllPhotos($photos) |
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{ |
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$success = true; |
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foreach ($photos as $id => $source) { |
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if ($this->downloadOnePhoto($id, $source) === false) { |
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$success = false; |
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} |
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} |
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return $success; |
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} |
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/** |
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* Download one photo |
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* @param string $id Photo id |
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* @param string $source Photo downlaod url |
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*/ |
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public function downloadOnePhoto($id, $source) |
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{ |
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$destination = $this->destination.'/'.$id.'.jpg'; |
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$this->notify('Download photo from '.$source.' to '.$destination.'... '); |
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if ($this->history->has($id)) { |
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$this->notify('ignored (in history).'.PHP_EOL, self::NOTIFY_COMMENT); |
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return true; |
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} |
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$status = $this->copyFile($source, $destination); |
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if ($status === false) { |
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$this->notify('failed.'.PHP_EOL, self::NOTIFY_ERROR); |
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return false; |
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} |
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$this->history->put($id); |
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$this->notify('success.'.PHP_EOL, self::NOTIFY_INFO); |
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return true; |
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} |
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/** |
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* List all categories returned by API |
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* @param Unsplash $unsplash Proxy to Unsplash API |
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* @return boolean True on success |
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*/ |
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public function listCategories(Unsplash $unsplash) |
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{ |
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$this->notify('Unsplash categories :'.PHP_EOL); |
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$categories = $unsplash->allCategories(); |
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foreach ($categories as $id => $name) { |
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$this->notify(sprintf("\t%s => %s%s", $id, $name, PHP_EOL)); |
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} |
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return true; |
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} |
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/** |
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* Download file from source to destination |
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* @param string $source URL to download the file from |
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* @param string $destination Path to download the file to |
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* @return bool True if the copy is successful |
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* @codeCoverageIgnore |
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*/ |
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public function copyFile($source, $destination) { |
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return @copy($source, $destination); |
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} |
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} |
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