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<?php |
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/** |
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* This file contains only the GoogleCloudVision class. |
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*/ |
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namespace Wikisource\GoogleCloudVisionPHP; |
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use Exception; |
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class GoogleCloudVision |
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{ |
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protected $features = array(); |
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protected $imageContext = array(); |
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protected $image = array(); |
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protected $requestBody = array(); |
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protected $version = "v1"; |
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protected $endpoint = "https://vision.googleapis.com/"; |
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protected $key; |
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/** @var int The maximum size allowed for the image, in bytes. */ |
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protected $imageMaxSize; |
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/** @var string Image type: Google Cloud Storage URI. Note the typo. */ |
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const IMAGE_TYPE_GCS = 'GSC'; |
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/** @var string Image type: file path or URL. */ |
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const IMAGE_TYPE_FILE = 'FILE'; |
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/** @var string Image type: raw data. */ |
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const IMAGE_TYPE_RAW = 'RAW'; |
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/** |
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* Create a new GCV API object. |
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*/ |
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public function __construct() |
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{ |
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$this->imageMaxSize = 1024 * 1024 * 4; |
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} |
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/** |
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* Change the URL for the API endpoint. Defaults to https://vision.googleapis.com/ but may need to be changed for |
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* various reasons (e.g. if routing through a proxy server). |
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* |
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* @param string $newEndpoint The new URL of the API endpoint. |
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*/ |
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public function setEndpoint($newEndpoint) |
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{ |
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$this->endpoint = $newEndpoint; |
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} |
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/** |
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* Set the permitted maximum size of images. |
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* This defaults to 4 MB as per the Google Clound Vision API limits documentation. |
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* |
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* @param ing $newSize |
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* @throws Exception |
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*/ |
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public function setImageMaxSize($newSize) |
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{ |
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if (!is_int($newSize)) { |
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throw new Exception("Image size must be specified in integer bytes, '$newSize' given"); |
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} |
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$this->imageMaxSize = $newSize; |
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} |
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/** |
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* Set the image that will be sent to the API. |
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* |
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* An image can be set from a filename or URL, raw data, or a Google Cloud Storage item. |
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* |
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* A Google Cloud Storage image URI must be in the following form: gs://bucket_name/object_name. |
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* Object versioning is not supported. |
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* Read more: https://cloud.google.com/vision/reference/rest/v1/images/annotate#imagesource |
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* |
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* @param mixed $input The filename, URL, data, etc. |
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* @param string $type The type that $input should be treated as. |
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* @return string[] The request body. |
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* @throws LimitExceededException When the image size is over the maximum permitted. |
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*/ |
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public function setImage($input, $type = self::IMAGE_TYPE_FILE) |
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{ |
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if ($type === self::IMAGE_TYPE_GCS) { |
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$this->image['source']['gcsImageUri'] = $input; |
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} elseif ($type === self::IMAGE_TYPE_FILE) { |
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$this->image['content'] = $this->convertImgtoBased64($input); |
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} elseif ($type === self::IMAGE_TYPE_RAW) { |
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$size = strlen($input); |
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if ($size > $this->imageMaxSize) { |
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throw new LimitExceededException("Image size ($size) exceeds permitted size ($this->imageMaxSize)", 1); |
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} |
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$this->image['content'] = base64_encode($input); |
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} |
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return $this->setRequestBody(); |
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} |
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/** |
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* Fetch base64-encoded data of the specified image. |
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* |
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* @param string $path Path to the image file. Anything supported by file_get_contents is suitable. |
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* @return string The encoded data as a string or FALSE on failure. |
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* @throws LimitExceededException When the image size is over the maximum permitted. |
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*/ |
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public function convertImgtoBased64($path) |
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{ |
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// Get the data. |
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$data = file_get_contents($path); |
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// Check the size. |
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$size = strlen($data); |
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if ($size > $this->imageMaxSize) { |
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$msg = "Image size of %s (%s) exceeds permitted size (%s)"; |
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throw new LimitExceededException(sprintf($msg, $path, $size, $this->imageMaxSize), 2); |
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} |
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// Return encoded data. |
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return base64_encode($data); |
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} |
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/** |
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* Set the request body, based on the image, features, and imageContext. |
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* |
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* @return string[] |
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*/ |
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protected function setRequestBody() |
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{ |
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if (!empty($this->image)) { |
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$this->requestBody['requests'][0]['image'] = $this->image; |
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} |
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if (!empty($this->features)) { |
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$this->requestBody['requests'][0]['features'] = $this->features; |
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} |
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if (!empty($this->imageContext)) { |
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$this->requestBody['requests'][0]['imageContext'] = $this->imageContext; |
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} |
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return $this->requestBody; |
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} |
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public function addFeature($type, $maxResults = 1) |
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{ |
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if (!is_numeric($maxResults)) { |
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throw new Exception("maxResults variable is not valid it should be Integer.", 1); |
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} |
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$this->features[] = array("type" => $type, "maxResults" => $maxResults); |
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return $this->setRequestBody(); |
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} |
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public function setImageContext($imageContext) |
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{ |
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if (!is_array($imageContext)) { |
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throw new Exception("imageContext variable is not valid it should be Array.", 1); |
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} |
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$this->imageContext = $imageContext; |
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return $this->setRequestBody(); |
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} |
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public function addFeatureUnspecified($maxResults = 1) |
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{ |
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return $this->addFeature("TYPE_UNSPECIFIED", $maxResults); |
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} |
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public function addFeatureFaceDetection($maxResults = 1) |
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{ |
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return $this->addFeature("FACE_DETECTION", $maxResults); |
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} |
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public function addFeatureLandmarkDetection($maxResults = 1) |
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{ |
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return $this->addFeature("LANDMARK_DETECTION", $maxResults); |
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} |
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public function addFeatureLogoDetection($maxResults = 1) |
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{ |
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return $this->addFeature("LOGO_DETECTION", $maxResults); |
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} |
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public function addFeatureLabelDetection($maxResults = 1) |
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{ |
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return $this->addFeature("LABEL_DETECTION", $maxResults); |
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} |
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public function addFeatureOCR($maxResults = 1) |
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{ |
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return $this->addFeature("TEXT_DETECTION", $maxResults); |
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} |
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public function addFeatureSafeSeachDetection($maxResults = 1) |
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{ |
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return $this->addFeature("SAFE_SEARCH_DETECTION", $maxResults); |
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} |
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public function addFeatureImageProperty($maxResults = 1) |
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{ |
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return $this->addFeature("IMAGE_PROPERTIES", $maxResults); |
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} |
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/** |
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* Send the request to Google and get the results. |
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* |
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* @param string $apiMethod Which API method to use. Currently can only be 'annotate'. |
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* |
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* @return string[] The results of the request. |
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* @throws Exception If any of the key, features, or image have not been set yet. |
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*/ |
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public function request($apiMethod = "annotate") |
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{ |
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if (empty($this->key) === true) { |
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$msg = "API Key is empty, please grant from https://console.cloud.google.com/apis/credentials"; |
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throw new Exception($msg); |
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} |
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if (empty($this->features) === true) { |
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throw new Exception("Features is can't empty.", 1); |
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} |
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if (empty($this->image) === true) { |
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throw new Exception("Images is can't empty.", 1); |
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} |
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$url = $this->endpoint.$this->version."/images:$apiMethod?key=".$this->key; |
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return $this->requestServer($url, $this->requestBody); |
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} |
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/** |
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* Set the API key. |
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* |
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* @param string $key The API key. |
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* |
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* @return void |
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*/ |
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public function setKey($key) |
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{ |
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$this->key = $key; |
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} |
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/** |
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* Execute the request and return the result. |
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* |
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* @param string $url The full URL to query. |
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* @param string[] $data The data to send. |
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* |
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* @return string[] The resulting information about the image. |
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*/ |
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protected function requestServer($url, $data) |
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{ |
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$ch = curl_init(); |
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curl_setopt($ch, CURLOPT_URL, $url); |
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curl_setopt($ch, CURLOPT_HEADER, 0); |
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); |
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curl_setopt($ch, CURLOPT_POST, 1); |
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curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data)); |
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curl_setopt($ch, CURLOPT_HTTPHEADER, array("Content-Type: application/json")); |
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$res = json_decode(curl_exec($ch), true); |
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return $res; |
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} |
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} |
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