示例#1
0
	public function setCreator($orderIndex, Zotero_Creator $creator, $creatorTypeID) {
		if ($this->id && !$this->loaded['creators']) {
			$this->loadCreators();
		}
		else {
			$this->loaded['creators'] = true;
		}
		
		if (!is_integer($orderIndex)) {
			throw new Exception("orderIndex must be an integer");
		}
		if (!($creator instanceof Zotero_Creator)) {
			throw new Exception("creator must be a Zotero_Creator object");
		}
		if (!is_integer($creatorTypeID)) {
			throw new Exception("creatorTypeID must be an integer");
		}
		if (!Zotero_CreatorTypes::getID($creatorTypeID)) {
			throw new Exception("Invalid creatorTypeID '$creatorTypeID'");
		}
		if ($this->libraryID != $creator->libraryID) {
			throw new Exception("Creator library IDs don't match");
		}
		
		// If creatorTypeID isn't valid for this type, use the primary type
		if (!Zotero_CreatorTypes::isValidForItemType($creatorTypeID, $this->itemTypeID)) {
			$msg = "Invalid creator type $creatorTypeID for item type " . $this->itemTypeID
					. " -- changing to primary creator";
			Z_Core::debug($msg);
			$creatorTypeID = Zotero_CreatorTypes::getPrimaryIDForType($this->itemTypeID);
		}
		
		// If creator already exists at this position, cancel
		if (isset($this->creators[$orderIndex])
				&& $this->creators[$orderIndex]['ref']->id == $creator->id
				&& $this->creators[$orderIndex]['creatorTypeID'] == $creatorTypeID
				&& !$creator->hasChanged()) {
			Z_Core::debug("Creator in position $orderIndex hasn't changed", 4);
			return false;
		}
		
		$this->creators[$orderIndex]['ref'] = $creator;
		$this->creators[$orderIndex]['creatorTypeID'] = $creatorTypeID;
		$this->changed['creators'][$orderIndex] = true;
		return true;
	}
示例#2
0
 private static function validateJSONItem($json, $libraryID, Zotero_Item $item = null, $isChild, $requestParams, $partialUpdate = false)
 {
     $isNew = !$item || !$item->version;
     if (!is_object($json)) {
         throw new Exception("Invalid item object (found " . gettype($json) . " '" . $json . "')", Z_ERROR_INVALID_INPUT);
     }
     if (isset($json->items) && is_array($json->items)) {
         throw new Exception("An 'items' array is not valid for single-item updates", Z_ERROR_INVALID_INPUT);
     }
     $apiVersion = $requestParams['v'];
     if ($partialUpdate) {
         $requiredProps = [];
     } else {
         if (isset($json->itemType) && $json->itemType == "attachment") {
             $requiredProps = array('linkMode', 'tags');
         } else {
             if (isset($json->itemType) && $json->itemType == "attachment") {
                 $requiredProps = array('tags');
             } else {
                 if ($isNew) {
                     $requiredProps = array('itemType');
                 } else {
                     if ($apiVersion < 2) {
                         $requiredProps = array('itemType', 'tags');
                     } else {
                         $requiredProps = array('itemType', 'tags', 'relations');
                         if (!$isChild) {
                             $requiredProps[] = 'collections';
                         }
                     }
                 }
             }
         }
     }
     foreach ($requiredProps as $prop) {
         if (!isset($json->{$prop})) {
             throw new Exception("'{$prop}' property not provided", Z_ERROR_INVALID_INPUT);
         }
     }
     // For partial updates where item type isn't provided, use the existing item type
     if (!isset($json->itemType) && $partialUpdate) {
         $itemType = Zotero_ItemTypes::getName($item->itemTypeID);
     } else {
         $itemType = $json->itemType;
     }
     foreach ($json as $key => $val) {
         switch ($key) {
             // Handled by Zotero_API::checkJSONObjectVersion()
             case 'key':
             case 'version':
                 if ($apiVersion < 3) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'itemKey':
             case 'itemVersion':
                 if ($apiVersion != 2) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'parentItem':
                 if ($apiVersion < 2) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 if (!Zotero_ID::isValidKey($val) && $val !== false) {
                     throw new Exception("'{$key}' must be a valid item key", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'itemType':
                 if (!is_string($val)) {
                     throw new Exception("'itemType' must be a string", Z_ERROR_INVALID_INPUT);
                 }
                 if ($isChild || !empty($json->parentItem)) {
                     switch ($val) {
                         case 'note':
                         case 'attachment':
                             break;
                         default:
                             throw new Exception("Child item must be note or attachment", Z_ERROR_INVALID_INPUT);
                     }
                 } else {
                     if ($val == 'attachment' && (!$item || !$item->getSource())) {
                         if ($json->linkMode == 'linked_url' || $json->linkMode == 'imported_url' && (empty($json->contentType) || $json->contentType != 'application/pdf')) {
                             throw new Exception("Only file attachments and PDFs can be top-level items", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 if (!Zotero_ItemTypes::getID($val)) {
                     throw new Exception("'{$val}' is not a valid itemType", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'tags':
                 if (!is_array($val)) {
                     throw new Exception("'{$key}' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $tag) {
                     $empty = true;
                     if (is_string($tag)) {
                         if ($tag === "") {
                             throw new Exception("Tag cannot be empty", Z_ERROR_INVALID_INPUT);
                         }
                         continue;
                     }
                     if (!is_object($tag)) {
                         throw new Exception("Tag must be an object", Z_ERROR_INVALID_INPUT);
                     }
                     foreach ($tag as $k => $v) {
                         switch ($k) {
                             case 'tag':
                                 if (!is_scalar($v)) {
                                     throw new Exception("Invalid tag name", Z_ERROR_INVALID_INPUT);
                                 }
                                 if ($v === "") {
                                     throw new Exception("Tag cannot be empty", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'type':
                                 if (!is_numeric($v)) {
                                     throw new Exception("Invalid tag type '{$v}'", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             default:
                                 throw new Exception("Invalid tag property '{$k}'", Z_ERROR_INVALID_INPUT);
                         }
                         $empty = false;
                     }
                     if ($empty) {
                         throw new Exception("Tag object is empty", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'collections':
                 if (!is_array($val)) {
                     throw new Exception("'{$key}' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 if ($isChild && $val) {
                     throw new Exception("Child items cannot be assigned to collections", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $k) {
                     if (!Zotero_ID::isValidKey($k)) {
                         throw new Exception("'{$k}' is not a valid collection key", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'relations':
                 if ($apiVersion < 2) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 if (!is_object($val) && !(is_array($val) && empty($val))) {
                     throw new Exception("'{$key}' property must be an object", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $predicate => $object) {
                     switch ($predicate) {
                         case 'owl:sameAs':
                         case 'dc:replaces':
                         case 'dc:relation':
                             break;
                         default:
                             throw new Exception("Unsupported predicate '{$predicate}'", Z_ERROR_INVALID_INPUT);
                     }
                     $arr = is_string($object) ? [$object] : $object;
                     foreach ($arr as $uri) {
                         if (!preg_match('/^http:\\/\\/zotero.org\\/(users|groups)\\/[0-9]+\\/(publications\\/)?items\\/[A-Z0-9]{8}$/', $uri)) {
                             throw new Exception("'{$key}' values currently must be Zotero item URIs", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 break;
             case 'creators':
                 if (!is_array($val)) {
                     throw new Exception("'{$key}' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $creator) {
                     $empty = true;
                     if (!isset($creator->creatorType)) {
                         throw new Exception("creator object must contain 'creatorType'", Z_ERROR_INVALID_INPUT);
                     }
                     if ((!isset($creator->name) || trim($creator->name) == "") && (!isset($creator->firstName) || trim($creator->firstName) == "") && (!isset($creator->lastName) || trim($creator->lastName) == "")) {
                         // On item creation, ignore single nameless creator,
                         // because that's in the item template that the API returns
                         if (sizeOf($val) == 1 && $isNew) {
                             continue;
                         } else {
                             throw new Exception("creator object must contain 'firstName'/'lastName' or 'name'", Z_ERROR_INVALID_INPUT);
                         }
                     }
                     foreach ($creator as $k => $v) {
                         switch ($k) {
                             case 'creatorType':
                                 $creatorTypeID = Zotero_CreatorTypes::getID($v);
                                 if (!$creatorTypeID) {
                                     throw new Exception("'{$v}' is not a valid creator type", Z_ERROR_INVALID_INPUT);
                                 }
                                 $itemTypeID = Zotero_ItemTypes::getID($itemType);
                                 if (!Zotero_CreatorTypes::isValidForItemType($creatorTypeID, $itemTypeID)) {
                                     // Allow 'author' in all item types, but reject other invalid creator types
                                     if ($creatorTypeID != Zotero_CreatorTypes::getID('author')) {
                                         throw new Exception("'{$v}' is not a valid creator type for item type '{$itemType}'", Z_ERROR_INVALID_INPUT);
                                     }
                                 }
                                 break;
                             case 'firstName':
                                 if (!isset($creator->lastName)) {
                                     throw new Exception("'lastName' creator field must be set if 'firstName' is set", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->name)) {
                                     throw new Exception("'firstName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'lastName':
                                 if (!isset($creator->firstName)) {
                                     throw new Exception("'firstName' creator field must be set if 'lastName' is set", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->name)) {
                                     throw new Exception("'lastName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'name':
                                 if (isset($creator->firstName)) {
                                     throw new Exception("'firstName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->lastName)) {
                                     throw new Exception("'lastName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             default:
                                 throw new Exception("Invalid creator property '{$k}'", Z_ERROR_INVALID_INPUT);
                         }
                         $empty = false;
                     }
                     if ($empty) {
                         throw new Exception("Creator object is empty", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'note':
                 switch ($itemType) {
                     case 'note':
                     case 'attachment':
                         break;
                     default:
                         throw new Exception("'note' property is valid only for note and attachment items", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'attachments':
             case 'notes':
                 if ($apiVersion > 1) {
                     throw new Exception("'{$key}' property is no longer supported", Z_ERROR_INVALID_INPUT);
                 }
                 if (!$isNew) {
                     throw new Exception("'{$key}' property is valid only for new items", Z_ERROR_INVALID_INPUT);
                 }
                 if (!is_array($val)) {
                     throw new Exception("'{$key}' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $child) {
                     // Check child item type ('attachment' or 'note')
                     $t = substr($key, 0, -1);
                     if (isset($child->itemType) && $child->itemType != $t) {
                         throw new Exception("Child {$t} must be of itemType '{$t}'", Z_ERROR_INVALID_INPUT);
                     }
                     if ($key == 'note') {
                         if (!isset($child->note)) {
                             throw new Exception("'note' property not provided for child note", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 break;
             case 'deleted':
                 break;
                 // Attachment properties
             // Attachment properties
             case 'linkMode':
                 try {
                     $linkMode = Zotero_Attachments::linkModeNameToNumber($val, true);
                 } catch (Exception $e) {
                     throw new Exception("'{$val}' is not a valid linkMode", Z_ERROR_INVALID_INPUT);
                 }
                 // Don't allow changing of linkMode
                 if (!$isNew && $linkMode != $item->attachmentLinkMode) {
                     throw new Exception("Cannot change attachment linkMode", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'contentType':
             case 'charset':
             case 'filename':
             case 'md5':
             case 'mtime':
                 if ($itemType != 'attachment') {
                     throw new Exception("'{$key}' is valid only for attachment items", Z_ERROR_INVALID_INPUT);
                 }
                 switch ($key) {
                     case 'filename':
                     case 'md5':
                     case 'mtime':
                         $lm = isset($json->linkMode) ? $json->linkMode : Zotero_Attachments::linkModeNumberToName($item->attachmentLinkMode);
                         if (strpos(strtolower($lm), 'imported_') !== 0) {
                             throw new Exception("'{$key}' is valid only for imported attachment items", Z_ERROR_INVALID_INPUT);
                         }
                         break;
                 }
                 switch ($key) {
                     case 'contentType':
                     case 'charset':
                     case 'filename':
                         $propName = 'attachment' . ucwords($key);
                         break;
                     case 'md5':
                         $propName = 'attachmentStorageHash';
                         break;
                     case 'mtime':
                         $propName = 'attachmentStorageModTime';
                         break;
                 }
                 if (Zotero_Libraries::getType($libraryID) == 'group') {
                     if ($item && $item->{$propName} !== $val || !$item && $val !== null && $val !== "") {
                         throw new Exception("Cannot change '{$key}' directly in group library", Z_ERROR_INVALID_INPUT);
                     }
                 } else {
                     if ($key == 'md5') {
                         if ($val && !preg_match("/^[a-f0-9]{32}\$/", $val)) {
                             throw new Exception("'{$val}' is not a valid MD5 hash", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 break;
             case 'accessDate':
                 if ($apiVersion >= 3 && $val !== '' && $val != 'CURRENT_TIMESTAMP' && !Zotero_Date::isSQLDate($val) && !Zotero_Date::isSQLDateTime($val) && !Zotero_Date::isISO8601($val)) {
                     throw new Exception("'{$key}' must be in ISO 8601 or UTC 'YYYY-MM-DD[ hh-mm-dd]' format or 'CURRENT_TIMESTAMP' ({$val})", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'dateAdded':
                 if (!Zotero_Date::isSQLDateTime($val) && !Zotero_Date::isISO8601($val)) {
                     throw new Exception("'{$key}' must be in ISO 8601 or UTC 'YYYY-MM-DD hh-mm-dd' format", Z_ERROR_INVALID_INPUT);
                 }
                 if (!$isNew) {
                     // Convert ISO date to SQL date for equality comparison
                     if (Zotero_Date::isISO8601($val)) {
                         $val = Zotero_Date::iso8601ToSQL($val);
                     }
                     if ($val != $item->{$key}) {
                         throw new Exception("'{$key}' cannot be modified for existing items", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'dateModified':
                 if (!Zotero_Date::isSQLDateTime($val) && !Zotero_Date::isISO8601($val)) {
                     throw new Exception("'{$key}' must be in ISO 8601 or UTC 'YYYY-MM-DD hh-mm-dd' format ({$val})", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             default:
                 if (!Zotero_ItemFields::getID($key)) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 if (is_array($val)) {
                     throw new Exception("Unexpected array for property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 break;
         }
     }
     // Publications libraries have additional restrictions
     if (Zotero_Libraries::getType($libraryID) == 'publications') {
         Zotero_Publications::validateJSONItem($json);
     }
 }
示例#3
0
 private static function validateJSONItem($json, $libraryID, $item = null, $isChild = false)
 {
     $isNew = !$item;
     if (!is_object($json)) {
         throw new Exception("Invalid item object (found " . gettype($json) . " '" . $json . "')", Z_ERROR_INVALID_INPUT);
     }
     if (isset($json->items) && is_array($json->items)) {
         throw new Exception("An 'items' array is not valid for item updates", Z_ERROR_INVALID_INPUT);
     }
     if (isset($json->itemType) && $json->itemType == "attachment") {
         $requiredProps = array('linkMode', 'tags');
     } else {
         if (isset($json->itemType) && $json->itemType == "attachment") {
             $requiredProps = array('tags');
         } else {
             if ($isNew) {
                 $requiredProps = array('itemType');
             } else {
                 $requiredProps = array('itemType', 'creators', 'tags');
             }
         }
     }
     foreach ($requiredProps as $prop) {
         if (!isset($json->{$prop})) {
             throw new Exception("'{$prop}' property not provided", Z_ERROR_INVALID_INPUT);
         }
     }
     foreach ($json as $key => $val) {
         switch ($key) {
             case 'itemType':
                 if (!is_string($val)) {
                     throw new Exception("'itemType' must be a string", Z_ERROR_INVALID_INPUT);
                 }
                 if ($isChild) {
                     switch ($val) {
                         case 'note':
                         case 'attachment':
                             break;
                         default:
                             throw new Exception("Child item must be note or attachment", Z_ERROR_INVALID_INPUT);
                     }
                 } else {
                     if ($val == 'attachment' && (!$item || !$item->getSource())) {
                         if ($json->linkMode == 'linked_url' || $json->linkMode == 'imported_url' && (empty($json->contentType) || $json->contentType != 'application/pdf')) {
                             throw new Exception("Only file attachments and PDFs can be top-level items", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 if (!Zotero_ItemTypes::getID($val)) {
                     throw new Exception("'{$val}' is not a valid itemType", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'tags':
                 if (!is_array($val)) {
                     throw new Exception("'tags' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $tag) {
                     $empty = true;
                     foreach ($tag as $k => $v) {
                         switch ($k) {
                             case 'tag':
                                 if (!is_scalar($v)) {
                                     throw new Exception("Invalid tag name", Z_ERROR_INVALID_INPUT);
                                 }
                                 if ($v === "") {
                                     throw new Exception("Tag cannot be empty", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'type':
                                 if (!is_numeric($v)) {
                                     throw new Exception("Invalid tag type '{$v}'", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             default:
                                 throw new Exception("Invalid tag property '{$k}'", Z_ERROR_INVALID_INPUT);
                         }
                         $empty = false;
                     }
                     if ($empty) {
                         throw new Exception("Tag object is empty", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'creators':
                 if (!is_array($val)) {
                     throw new Exception("'creators' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $creator) {
                     $empty = true;
                     if (!isset($creator->creatorType)) {
                         throw new Exception("creator object must contain 'creatorType'", Z_ERROR_INVALID_INPUT);
                     }
                     if ((!isset($creator->name) || trim($creator->name) == "") && (!isset($creator->firstName) || trim($creator->firstName) == "") && (!isset($creator->lastName) || trim($creator->lastName) == "")) {
                         // On item creation, ignore single nameless creator,
                         // because that's in the item template that the API returns
                         if (sizeOf($val) == 1 && $isNew) {
                             continue;
                         } else {
                             throw new Exception("creator object must contain 'firstName'/'lastName' or 'name'", Z_ERROR_INVALID_INPUT);
                         }
                     }
                     foreach ($creator as $k => $v) {
                         switch ($k) {
                             case 'creatorType':
                                 $creatorTypeID = Zotero_CreatorTypes::getID($v);
                                 if (!$creatorTypeID) {
                                     throw new Exception("'{$v}' is not a valid creator type", Z_ERROR_INVALID_INPUT);
                                 }
                                 $itemTypeID = Zotero_ItemTypes::getID($json->itemType);
                                 if (!Zotero_CreatorTypes::isValidForItemType($creatorTypeID, $itemTypeID)) {
                                     throw new Exception("'{$v}' is not a valid creator type for item type '" . $json->itemType . "'", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'firstName':
                                 if (!isset($creator->lastName)) {
                                     throw new Exception("'lastName' creator field must be set if 'firstName' is set", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->name)) {
                                     throw new Exception("'firstName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'lastName':
                                 if (!isset($creator->firstName)) {
                                     throw new Exception("'firstName' creator field must be set if 'lastName' is set", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->name)) {
                                     throw new Exception("'lastName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             case 'name':
                                 if (isset($creator->firstName)) {
                                     throw new Exception("'firstName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 if (isset($creator->lastName)) {
                                     throw new Exception("'lastName' and 'name' creator fields are mutually exclusive", Z_ERROR_INVALID_INPUT);
                                 }
                                 break;
                             default:
                                 throw new Exception("Invalid creator property '{$k}'", Z_ERROR_INVALID_INPUT);
                         }
                         $empty = false;
                     }
                     if ($empty) {
                         throw new Exception("Creator object is empty", Z_ERROR_INVALID_INPUT);
                     }
                 }
                 break;
             case 'note':
                 switch ($json->itemType) {
                     case 'note':
                     case 'attachment':
                         break;
                     default:
                         throw new Exception("'note' property is valid only for note and attachment items", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'attachments':
             case 'notes':
                 if (!$isNew) {
                     throw new Exception("'{$key}' property is valid only for new items", Z_ERROR_INVALID_INPUT);
                 }
                 if (!is_array($val)) {
                     throw new Exception("'{$key}' property must be an array", Z_ERROR_INVALID_INPUT);
                 }
                 foreach ($val as $child) {
                     // Check child item type ('attachment' or 'note')
                     $t = substr($key, 0, -1);
                     if (isset($child->itemType) && $child->itemType != $t) {
                         throw new Exception("Child {$t} must be of itemType '{$t}'", Z_ERROR_INVALID_INPUT);
                     }
                     if ($key == 'note') {
                         if (!isset($child->note)) {
                             throw new Exception("'note' property not provided for child note", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 break;
             case 'deleted':
                 break;
                 // Attachment properties
             // Attachment properties
             case 'linkMode':
                 try {
                     $linkMode = Zotero_Attachments::linkModeNameToNumber($val, true);
                 } catch (Exception $e) {
                     throw new Exception("'{$val}' is not a valid linkMode", Z_ERROR_INVALID_INPUT);
                 }
                 // Don't allow changing of linkMode
                 if ($item && $linkMode != $item->attachmentLinkMode) {
                     throw new Exception("Cannot change attachment linkMode", Z_ERROR_INVALID_INPUT);
                 }
                 break;
             case 'contentType':
             case 'charset':
             case 'filename':
             case 'md5':
             case 'mtime':
                 if ($json->itemType != 'attachment') {
                     throw new Exception("'{$key}' is valid only for attachment items", Z_ERROR_INVALID_INPUT);
                 }
                 switch ($key) {
                     case 'filename':
                     case 'md5':
                     case 'mtime':
                         if (strpos($json->linkMode, 'imported_') !== 0) {
                             throw new Exception("'{$key}' is valid only for imported attachment items", Z_ERROR_INVALID_INPUT);
                         }
                         break;
                 }
                 switch ($key) {
                     case 'contentType':
                     case 'charset':
                     case 'filename':
                         $propName = 'attachment' . ucwords($key);
                         break;
                     case 'md5':
                         $propName = 'attachmentStorageHash';
                         break;
                     case 'mtime':
                         $propName = 'attachmentStorageModTime';
                         break;
                 }
                 if (Zotero_Libraries::getType($libraryID) == 'group') {
                     if ($item && $item->{$propName} !== $val || !$item && $val !== null && $val !== "") {
                         throw new Exception("Cannot change '{$key}' directly in group library", Z_ERROR_INVALID_INPUT);
                     }
                 } else {
                     if ($key == 'md5') {
                         if ($val && !preg_match("/^[a-f0-9]{32}\$/", $val)) {
                             throw new Exception("'{$val}' is not a valid MD5 hash", Z_ERROR_INVALID_INPUT);
                         }
                     }
                 }
                 break;
             default:
                 if (!Zotero_ItemFields::getID($key)) {
                     throw new Exception("Invalid property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 if (is_array($val)) {
                     throw new Exception("Unexpected array for property '{$key}'", Z_ERROR_INVALID_INPUT);
                 }
                 break;
         }
     }
 }