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Current File : /home/utripoli/public_html/journalDEL/dl/lib/pkp/classes/services/PKPSchemaService.inc.php
<?php
/**
 * @file classes/services/PKPSchemaService.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class PKPSchemaService
 * @ingroup services
 *
 * @brief Helper class for loading schemas, using them to sanitize and
 *  validate objects, and installing default data.
 */
namespace PKP\Services;

define('SCHEMA_ANNOUNCEMENT', 'announcement');
define('SCHEMA_AUTHOR', 'author');
define('SCHEMA_CONTEXT', 'context');
define('SCHEMA_EMAIL_TEMPLATE', 'emailTemplate');
define('SCHEMA_GALLEY', 'galley');
define('SCHEMA_ISSUE', 'issue');
define('SCHEMA_PUBLICATION', 'publication');
define('SCHEMA_REVIEW_ASSIGNMENT', 'reviewAssignment');
define('SCHEMA_REVIEW_ROUND', 'reviewRound');
define('SCHEMA_SECTION', 'section');
define('SCHEMA_SITE', 'site');
define('SCHEMA_SUBMISSION', 'submission');
define('SCHEMA_SUBMISSION_FILE', 'submissionFile');
define('SCHEMA_USER', 'user');
define('SCHEMA_USER_GROUP', 'userGroup');

class PKPSchemaService {
	/** @var array cache of schemas that have been loaded */
	private $_schemas = [];

	/**
	 * Get a schema
	 *
	 * - Loads the schema file and transforms it into an object
	 * - Passes schema through hook
	 * - Returns pre-loaded schemas on request
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $forceReload boolean Optional. Compile the schema again from the
	 *  source files, bypassing any cached version.
	 * @return object
	 */
	public function get($schemaName, $forceReload = false) {

		if (!$forceReload && array_key_exists($schemaName, $this->_schemas)) {
			return $this->_schemas[$schemaName];
		}

		$schemaFile = sprintf('%s/lib/pkp/schemas/%s.json', BASE_SYS_DIR, $schemaName);
		if (file_exists($schemaFile)) {
			$schema = json_decode(file_get_contents($schemaFile));
			if (!$schema) {
				fatalError('Schema failed to decode. This usually means it is invalid JSON. Requested: ' . $schemaFile . '. Last JSON error: ' . json_last_error());
			}
		} else {
			// allow plugins to create a custom schema and load it via hook
			$schema = new \stdClass();
		}

		// Merge an app-specific schema file if it exists
		$appSchemaFile = sprintf('%s/schemas/%s.json', BASE_SYS_DIR, $schemaName);
		if (file_exists($appSchemaFile)) {
			$appSchema = json_decode(file_get_contents($appSchemaFile));
			if (!$appSchema) {
				fatalError('Schema failed to decode. This usually means it is invalid JSON. Requested: ' . $appSchemaFile . '. Last JSON error: ' . json_last_error());
			}
			$schema = $this->merge($schema, $appSchema);
		}

		\HookRegistry::call('Schema::get::' . $schemaName, array(&$schema));

		$this->_schemas[$schemaName] = $schema;

		return $schema;
	}

	/**
	 * Merge two schemas
	 *
	 * Merges the properties of two schemas, updating the title, description,
	 * and properties definitions.
	 *
	 * If both schemas contain definitions for the same property, the property
	 * definition in the additional schema will override the base schema.
	 *
	 * @param $baseSchema object The base schema
	 * @param $additionalSchema object The additional schema properties to apply
	 *  to $baseSchema.
	 * @return object
	 */
	public function merge($baseSchema, $additionalSchema) {
		$newSchema = clone $baseSchema;
		if (!empty($additionalSchema->title)) {
			$newSchema->title = $additionalSchema->title;
		}
		if (!empty($additionalSchema->description)) {
			$newSchema->description = $additionalSchema->description;
		}
		if (!empty($additionalSchema->properties)) {
			if (empty($newSchema->properties)) {
				$newSchema->properties = new \stdClass();
			}
			foreach ($additionalSchema->properties as $propName => $propSchema) {
				$newSchema->properties->{$propName} = $propSchema;
			}
		}

		return $newSchema;
	}

	/**
	 * Get the summary properties of a schema
	 *
	 * Gets the properties of a schema which are considered part of the summary
	 * view presented in an API.
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @return array List of property names
	 */
	public function getSummaryProps($schemaName) {
		$schema = $this->get($schemaName);
		$props = [];
		foreach ($schema->properties as $propName => $propSchema) {
			if (property_exists($propSchema, 'apiSummary') && $propSchema->apiSummary) {
				$props[] = $propName;
			}
		}

		return $props;
	}

	/**
	 * Get all properties of a schema
	 *
	 * Gets the complete list of properties of a schema which are considered part
	 * of the full view presented in an API.
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @return array List of property names
	 */
	public function getFullProps($schemaName) {
		$schema = $this->get($schemaName);

		$propNames = [];
		foreach ($schema->properties as $propName => $propSchema) {
			if (empty($propSchema->writeOnly)) {
				$propNames[] = $propName;
			}
		}

		return $propNames;
	}

	/**
	 * Get required properties of a schema
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @return array List of property names
	 */
	public function getRequiredProps($schemaName) {
		$schema = $this->get($schemaName);

		if (!empty($schema->required)) {
			return $schema->required;
		}
		return [];
	}

	/**
	 * Get multilingual properties of a schema
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @return array List of property names
	 */
	public function getMultilingualProps($schemaName) {
		$schema = $this->get($schemaName);

		$multilingualProps = [];
		foreach ($schema->properties as $propName => $propSchema) {
			if (!empty($propSchema->multilingual)) {
				$multilingualProps[] = $propName;
			}
		}

		return $multilingualProps;
	}

	/**
	 * Sanitize properties according to a schema
	 *
	 * This method coerces properties to their appropriate type, and strips out
	 * properties that are not specified in the schema.
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $props array Properties to be sanitized
	 * @return array The sanitized props
	 */
	public function sanitize($schemaName, $props) {
		$schema = $this->get($schemaName);
		$cleanProps = [];

		foreach ($props as $propName => $propValue) {
			if (empty($schema->properties->{$propName})
				|| empty($schema->properties->{$propName}->type)
				|| !empty($schema->properties->{$propName}->readOnly)) {
				continue;
			}
			$propSchema = $schema->properties->{$propName};
			if (!empty($propSchema->multilingual)) {
				$values = [];
				foreach ((array) $propValue as $localeKey => $localeValue) {
					$values[$localeKey] = $this->coerce($localeValue, $propSchema->type, $propSchema);
				}
				if (!empty($values)) {
					$cleanProps[$propName] = $values;
				}
			} else {
				$cleanProps[$propName] = $this->coerce($propValue, $propSchema->type, $propSchema);
			}
		}

		return $cleanProps;
	}

	/**
	 * Coerce a value to a variable type
	 *
	 * It will leave null values alone.
	 *
	 * @param $value mixed
	 * @param $type string boolean, integer, number, string, array, object
	 * @param $schema object A schema defining this property
	 * @return mixed The value coerced to type
	 */
	public function coerce($value, $type, $schema) {
		if (is_null($value)) {
			return $value;
		}
		switch ($type) {
			case 'boolean':
				return (bool) $value;
			case 'integer':
				return (int) $value;
			case 'number':
				return (float) $value;
			case 'string':
				if (is_object($value) || is_array($value)) {
					$value = serialize($value);
				}
				return (string) $value;
			case 'array':
				$newArray = [];
				if (is_array($schema->items)) {
					foreach ($schema->items as $i => $itemSchema) {
						$newArray[$i] = $this->coerce($value[$i], $itemSchema->type, $itemSchema);
					}
				} elseif (is_array($value)) {
					foreach ($value as $i => $v) {
						$newArray[$i] = $this->coerce($v, $schema->items->type, $schema->items);
					}
				} else {
					$newArray[] = serialize($value);
				}
				return $newArray;
			case 'object':
				$newObject = []; // we handle JSON objects as assoc arrays in PHP
				foreach ($schema->properties as $propName => $propSchema) {
					if (!isset($value[$propName]) || !empty($propSchema->readOnly)) {
						continue;
					}
					$newObject[$propName] = $this->coerce($value[$propName], $propSchema->type, $propSchema);
				}
				return $newObject;
		}
		fatalError('Requested variable coercion for a type that was not recognized: ' . $type);
	}

	/**
	 * Get the validation rules for the properties of a schema
	 *
	 * These validation rules are returned in a format that is ready to be passed
	 * into ValidatorFactory::make().
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $allowedLocales array List of allowed locale keys.
	 * @return array List of validation rules for each property
	 */
	public function getValidationRules($schemaName, $allowedLocales) {
		$schema = $this->get($schemaName);

		$rules = [];
		foreach ($schema->properties as $propName => $propSchema) {
			if (!empty($propSchema->multilingual)) {
				foreach ($allowedLocales as $localeKey) {
					$rules = $this->addPropValidationRules($rules, $propName . '.' . $localeKey, $propSchema);
				}
			} else {
				$rules = $this->addPropValidationRules($rules, $propName, $propSchema);
			}
		}

		return $rules;
	}

	/**
	 * Compile the validation rules for a single property's schema
	 *
	 * @param $propSchema object The property schema
	 * @return array List of Laravel-formatted validation rules
	 */
	public function addPropValidationRules($rules, $ruleKey, $propSchema) {
		if (!empty($propSchema->readOnly)) {
			return $rules;
		}
		switch ($propSchema->type) {
			case 'boolean':
			case 'integer':
			case 'numeric':
			case 'string':
				$rules[$ruleKey] = [$propSchema->type];
				if (!empty($propSchema->validation)) {
					$rules[$ruleKey] = array_merge($rules[$ruleKey], $propSchema->validation);
				}
				break;
			case 'array':
				if ($propSchema->items->type === 'object') {
					$rules = $this->addPropValidationRules($rules, $ruleKey . '.*', $propSchema->items);
				} else {
					$rules[$ruleKey] = ['array'];
					if (!empty($propSchema->validation)) {
						$rules[$ruleKey] = array_merge($rules[$ruleKey], $propSchema->validation);
					}
					$rules[$ruleKey . '.*'] = [$propSchema->items->type];
					if (!empty($propSchema->items->validation)) {
						$rules[$ruleKey . '.*'] = array_merge($rules[$ruleKey . '.*'], $propSchema->items->validation);
					}
				}
				break;
			case 'object':
				foreach ($propSchema->properties as $subPropName => $subPropSchema) {
					$rules = $this->addPropValidationRules($rules, $ruleKey . '.' . $subPropName, $subPropSchema);
				}
				break;
		}

		return $rules;
	}

	/**
	 * Format validation errors
	 *
	 * This method receives a (Laravel) MessageBag object and formats an error
	 * array to match the entity's schema. It converts Laravel's dot notation for
	 * objects and arrays:
	 *
	 * [
	 *   foo.en_US: ['Error message'],
	 *   foo.fr_CA: ['Error message'],
	 *   bar.0.baz: ['Error message'],
	 * ]
	 *
	 * Into an assoc array, collapsing subproperty errors into their parent prop:
	 *
	 * [
	 *   foo: [
	 *     en_US: ['Error message'],
	 *     fr_CA: ['Error message'],
	 *   ],
	 *   bar: ['Error message'],
	 * ]
	 *
	 * @param $errorBag \Illuminate\Support\MessageBag
	 * @param $schema object The entity schema
	 * @return array
	 */
	public function formatValidationErrors($errorBag, $schema, $locales) {
		$errors = $errorBag->getMessages();
		$formatted = [];

		foreach ($errors as $ruleKey => $messages) {
			$ruleKeyParts = explode('.', $ruleKey);
			$propName = $ruleKeyParts[0];
			if (!isset($formatted[$propName])) {
				$formatted[$propName] = [];
			}
			if (!empty($schema->properties->{$propName}) && !empty($schema->properties->{$propName}->multilingual)) {
				$localeKey = $ruleKeyParts[1];
				if (!isset($formatted[$propName][$localeKey])) {
					$formatted[$propName][$localeKey] = [];
				}
				$formatted[$propName][$localeKey] = array_merge($formatted[$propName][$localeKey], $messages);
			} else {
				$formatted[$propName] = array_merge($formatted[$propName], $messages);
			}
		}

		return $formatted;
	}

	/**
	 * Set default values for an object
	 *
	 * Get default values from an object's schema and set them for the passed
	 * object.
	 *
	 * localeParams are used to populate translation strings where default values
	 * rely on them. For example, a locale string like the following:
	 *
	 * "This email was sent on behalf of {$contextName}."
	 *
	 * Will expect a $localeParams value like this:
	 *
	 * ['contextName' => 'Journal of Public Knowledge']
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $object DataObject The object to be modified
	 * @param $supportedLocales array List of locale keys that shoud receive
	 *  default content. Example: ['en_US', 'fr_CA']
	 * @param $primaryLocale string Example: `en_US`
	 * @param $localeParams array Key/value params for the translation strings
	 * @return DataObject
	 */
	public function setDefaults($schemaName, $object, $supportedLocales, $primaryLocale, $localeParams = array()) {
		$schema = $this->get($schemaName);

		// Ensure the locale files are loaded for all required locales
		foreach ($supportedLocales as $localeKey) {
			\AppLocale::requireComponents(
				LOCALE_COMPONENT_PKP_DEFAULT, LOCALE_COMPONENT_APP_DEFAULT,
				LOCALE_COMPONENT_PKP_COMMON, LOCALE_COMPONENT_APP_COMMON,
				$localeKey
			);
		}

		foreach ($schema->properties as $propName => $propSchema) {
			// Don't override existing values
			if (!is_null($object->getData($propName))) {
				continue;
			}
			if (!property_exists($propSchema, 'default') && !property_exists($propSchema, 'defaultLocaleKey')) {
				continue;
			}
			if (!empty($propSchema->multilingual)) {
				$value = [];
				foreach ($supportedLocales as $localeKey) {
					$value[$localeKey] = $this->getDefault($propSchema, $localeParams, $localeKey);
				}
			} else {
				$value = $this->getDefault($propSchema, $localeParams, $primaryLocale);
			}
			$object->setData($propName, $value);
		}

		return $object;
	}

	/**
	 * Get the default values for a specific locale
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $locale string The locale key to get values for. Example: `en_US`
	 * @param $localeParams array Key/value params for the translation strings
	 * @return array Key/value of property defaults for the specified locale
	 */
	public function getLocaleDefaults($schemaName, $locale, $localeParams) {
		$schema = $this->get($schemaName);
		\AppLocale::requireComponents(LOCALE_COMPONENT_PKP_DEFAULT, LOCALE_COMPONENT_APP_DEFAULT, $locale);

		$defaults = [];
		foreach ($schema->properties as $propName => $propSchema) {
			if (empty($propSchema->multilingual) || empty($propSchema->defaultLocaleKey)) {
				continue;
			}
			$defaults[$propName] = $this->getDefault($propSchema, $localeParams, $locale);
		}

		return $defaults;
	}

	/**
	 * Get a default value for a property based on the schema
	 *
	 * @param $propSchema object The schema definition for this property
	 * @param $localeParams array\null Optional. Key/value params for the translation strings
	 * @param $localeKey string|null Optional. The locale to translate into
	 * @return mixed Will return null if no default value is available
	 */
	public function getDefault($propSchema, $localeParams = null, $localeKey = null) {
		switch ($propSchema->type) {
			case 'boolean':
			case 'integer':
			case 'number':
			case 'string':
				if (property_exists($propSchema, 'default')) {
					return $propSchema->default;
				} elseif (property_exists($propSchema, 'defaultLocaleKey')) {
					return __($propSchema->defaultLocaleKey, $localeParams, $localeKey);
				}
				break;
			case 'array':
				$value = [];
				foreach ($propSchema->default as $default) {
					$itemSchema = $propSchema->items;
					$itemSchema->default = $default;
					$value[] = $this->getDefault($itemSchema, $localeParams, $localeKey);
				}
				return $value;
			case 'object':
				$value = [];
				foreach ($propSchema->properties as $subPropName => $subPropSchema) {
					if (!property_exists($propSchema->default, $subPropName)) {
						continue;
					}
					$defaultSubProp = $propSchema->default->{$subPropName};
					// If a prop is expected to be a string but the default value is an
					// object with a `defaultLocaleKey` property, then we render that
					// translation. Othewrise, we assign the values as-is and do not
					// recursively check for nested objects/arrays inside of objects.
					if ($subPropSchema->type === 'string' && is_object($defaultSubProp) && property_exists($defaultSubProp, 'defaultLocaleKey')) {
						$value[$subPropName] = __($defaultSubProp->defaultLocaleKey, $localeParams, $localeKey);
					} else {
						$value[$subPropName] = $defaultSubProp;
					}
				}
				return $value;
		}
		return null;
	}

	/**
	 * Add multilingual props for missing values
	 *
	 * This method will take a set of property values and add empty entries for
	 * any locales that are missing. Given the following:
	 *
	 * $values = [
	 *	'title' => [
	 *		'en_US' => 'The Journal of Public Knowledge',
	 *	]
	 * ]
	 *
	 * If the locales en_US and fr_CA are requested, it will return the following:
	 *
	 * $values = [
	 *	'title' => [
	 *		'en_US' => 'The Journal of Public Knowledge',
	 *		'fr_CA' => '',
	 *	]
	 * ]
	 *
	 * This is primarily used to ensure API responses present a consistent data
	 * structure regardless of which properties have values.
	 *
	 * @param $schemaName string One of the SCHEMA_... constants
	 * @param $values array Key/value list of entity properties
	 * @param $$localeKeys array List of locale keys expected in the result
	 * @return array
	 */
	public function addMissingMultilingualValues($schemaName, $values, $localeKeys) {
		$schema = $this->get($schemaName);
		$multilingualProps = $this->getMultilingualProps($schemaName);

		foreach ($values as $key => $value) {
			if (!in_array($key, $multilingualProps)) {
				continue;
			}
			foreach ($localeKeys as $localeKey) {
				if (is_array($value) && array_key_exists($localeKey, $value)) {
					continue;
				}
				switch ($schema->properties->{$key}->type) {
					case 'string':
						$values[$key][$localeKey] = '';
						break;
					case 'array':
						$values[$key][$localeKey] = [];
						break;
					default:
						$values[$key][$localeKey] = null;
				}
			}
		}

		return $values;
	}
}

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