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phabricator/src/aphront/httpparametertype/AphrontHTTPParameterType.php
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AphrontHTTPParameterType.php
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<?php
/**
* Defines how to read a complex value from an HTTP request.
*
* Most HTTP parameters are simple (like strings or integers) but some
* parameters accept more complex values (like lists of users or project names).
*
* This class handles reading simple and complex values from a request,
* performing any required parsing or lookups, and returning a result in a
* standard format.
*
* @task read Reading Values from a Request
* @task info Information About the Type
* @task util Parsing Utilities
* @task impl Implementation
*/
abstract class AphrontHTTPParameterType extends Phobject {
private $viewer;
/* -( Reading Values from a Request )-------------------------------------- */
/**
* Set the current viewer.
*
* Some parameter types perform complex parsing involving lookups. For
* example, a type might lookup usernames or project names. These types need
* to use the current viewer to execute queries.
*
* @param PhabricatorUser Current viewer.
* @return this
* @task read
*/
final public function setViewer(PhabricatorUser $viewer) {
$this->viewer = $viewer;
return $this;
}
/**
* Get the current viewer.
*
* @return PhabricatorUser Current viewer.
* @task read
*/
final public function getViewer() {
if (!$this->viewer) {
throw new PhutilInvalidStateException('setViewer');
}
return $this->viewer;
}
/**
* Test if a value is present in a request.
*
* @param AphrontRequest The incoming request.
* @param string The key to examine.
* @return bool True if a readable value is present in the request.
* @task read
*/
final public function getExists(AphrontRequest $request, $key) {
return $this->getParameterExists($request, $key);
}
/**
* Read a value from a request.
*
* If the value is not present, a default value is returned (usually `null`).
* Use @{method:getExists} to test if a value is present.
*
* @param AphrontRequest The incoming request.
* @param string The key to examine.
* @return wild Value, or default if value is not present.
* @task read
*/
final public function getValue(AphrontRequest $request, $key) {
if (!$this->getExists($request, $key)) {
return $this->getParameterDefault();
}
return $this->getParameterValue($request, $key);
}
/**
* Get the default value for this parameter type.
*
* @return wild Default value for this type.
* @task read
*/
final public function getDefaultValue() {
return $this->getParameterDefault();
}
/* -( Information About the Type )----------------------------------------- */
/**
* Get a short name for this type, like `string` or `list<phid>`.
*
* @return string Short type name.
* @task info
*/
final public function getTypeName() {
return $this->getParameterTypeName();
}
/**
* Get a list of human-readable descriptions of acceptable formats for this
* type.
*
* For example, a type might return strings like these:
*
* > Any positive integer.
* > A comma-separated list of PHIDs.
*
* This is used to explain to users how to specify a type when generating
* documentation.
*
* @return list<string> Human-readable list of acceptable formats.
* @task info
*/
final public function getFormatDescriptions() {
return $this->getParameterFormatDescriptions();
}
/**
* Get a list of human-readable examples of how to format this type as an
* HTTP GET parameter.
*
* For example, a type might return strings like these:
*
* > v=123
* > v[]=1&v[]=2
*
* This is used to show users how to specify parameters of this type in
* generated documentation.
*
* @return list<string> Human-readable list of format examples.
* @task info
*/
final public function getExamples() {
return $this->getParameterExamples();
}
/* -( Utilities )---------------------------------------------------------- */
/**
* Call another type's existence check.
*
* This method allows a type to reuse the existence behavior of a different
* type. For example, a "list of users" type may have the same basic
* existence check that a simpler "list of strings" type has, and can just
* call the simpler type to reuse its behavior.
*
* @param AphrontHTTPParameterType The other type.
* @param AphrontRequest Incoming request.
* @param string Key to examine.
* @return bool True if the parameter exists.
* @task util
*/
final protected function getExistsWithType(
AphrontHTTPParameterType $type,
AphrontRequest $request,
$key) {
$type->setViewer($this->getViewer());
return $type->getParameterExists($request, $key);
}
/**
* Call another type's value parser.
*
* This method allows a type to reuse the parsing behavior of a different
* type. For example, a "list of users" type may start by running the same
* basic parsing that a simpler "list of strings" type does.
*
* @param AphrontHTTPParameterType The other type.
* @param AphrontRequest Incoming request.
* @param string Key to examine.
* @return wild Parsed value.
* @task util
*/
final protected function getValueWithType(
AphrontHTTPParameterType $type,
AphrontRequest $request,
$key) {
$type->setViewer($this->getViewer());
return $type->getValue($request, $key);
}
/**
* Get a list of all available parameter types.
*
* @return list<AphrontHTTPParameterType> List of all available types.
* @task util
*/
final public static function getAllTypes() {
return id(new PhutilClassMapQuery())
->setAncestorClass(__CLASS__)
->setUniqueMethod('getTypeName')
->setSortMethod('getTypeName')
->execute();
}
/* -( Implementation )----------------------------------------------------- */
/**
* Test if a parameter exists in a request.
*
* See @{method:getExists}. By default, this method tests if the key is
* present in the request.
*
* To call another type's behavior in order to perform this check, use
* @{method:getExistsWithType}.
*
* @param AphrontRequest The incoming request.
* @param string The key to examine.
* @return bool True if a readable value is present in the request.
* @task impl
*/
protected function getParameterExists(AphrontRequest $request, $key) {
return $request->getExists($key);
}
/**
* Parse a value from a request.
*
* See @{method:getValue}. This method will //only// be called if this type
* has already asserted that the value exists with
* @{method:getParameterExists}.
*
* To call another type's behavior in order to parse a value, use
* @{method:getValueWithType}.
*
* @param AphrontRequest The incoming request.
* @param string The key to examine.
* @return wild Parsed value.
* @task impl
*/
abstract protected function getParameterValue(AphrontRequest $request, $key);
/**
* Return a simple type name string, like "string" or "list<phid>".
*
* See @{method:getTypeName}.
*
* @return string Short type name.
* @task impl
*/
abstract protected function getParameterTypeName();
/**
* Return a human-readable list of format descriptions.
*
* See @{method:getFormatDescriptions}.
*
* @return list<string> Human-readable list of acceptable formats.
* @task impl
*/
abstract protected function getParameterFormatDescriptions();
/**
* Return a human-readable list of examples.
*
* See @{method:getExamples}.
*
* @return list<string> Human-readable list of format examples.
* @task impl
*/
abstract protected function getParameterExamples();
/**
* Return the default value for this parameter type.
*
* See @{method:getDefaultValue}. If unspecified, the default is `null`.
*
* @return wild Default value.
* @task impl
*/
protected function getParameterDefault() {
return null;
}
}

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