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<?php
namespace MediaWiki\Rest;
/**
* This is a container for storing headers. The header names are case-insensitive,
* but the case is preserved for methods that return headers in bulk. The
* header values are a comma-separated list, or equivalently, an array of strings.
*
* Unlike PSR-7, the container is mutable.
*/
class HeaderContainer {
/** @var array[] */
private $headerLists = [];
/** @var string[] */
private $headerLines = [];
/** @var string[] */
private $headerNames = [];
/**
* Erase any existing headers and replace them with the specified
* header arrays or values.
*
* @param array $headers
*/
public function resetHeaders( $headers = [] ) {
$this->headerLines = [];
$this->headerLists = [];
$this->headerNames = [];
foreach ( $headers as $name => $value ) {
$this->headerNames[ strtolower( $name ) ] = $name;
[ $valueParts, $valueLine ] = $this->convertToListAndString( $value );
$this->headerLines[$name] = $valueLine;
$this->headerLists[$name] = $valueParts;
}
}
/**
* Take an input header value, which may either be a string or an array,
* and convert it to an array of header values and a header line.
*
* The return value is an array where element 0 has the array of header
* values, and element 1 has the header line.
*
* Theoretically, if the input is a string, this could parse the string
* and split it on commas. Doing this is complicated, because some headers
* can contain double-quoted strings containing commas. The User-Agent
* header allows commas in comments delimited by parentheses. So it is not
* just explode(",", $value), we would need to parse a grammar defined by
* RFC 7231 appendix D which depends on header name.
*
* It's unclear how much it would help handlers to have fully spec-aware
* HTTP header handling just to split on commas. They would probably be
* better served by an HTTP header parsing library which provides the full
* parse tree.
*
* @param string|string[] $value The input header value
* @return array
*/
private function convertToListAndString( $value ) {
if ( is_array( $value ) ) {
return [ array_values( $value ), implode( ', ', $value ) ];
} else {
return [ [ $value ], $value ];
}
}
/**
* Set or replace a header
*
* @param string $name
* @param string|string[] $value
*/
public function setHeader( $name, $value ) {
[ $valueParts, $valueLine ] = $this->convertToListAndString( $value );
$lowerName = strtolower( $name );
$origName = $this->headerNames[$lowerName] ?? null;
if ( $origName !== null ) {
unset( $this->headerLines[$origName] );
unset( $this->headerLists[$origName] );
}
$this->headerNames[$lowerName] = $name;
$this->headerLines[$name] = $valueLine;
$this->headerLists[$name] = $valueParts;
}
/**
* Set a header or append to an existing header
*
* @param string $name
* @param string|string[] $value
*/
public function addHeader( $name, $value ) {
[ $valueParts, $valueLine ] = $this->convertToListAndString( $value );
$lowerName = strtolower( $name );
$origName = $this->headerNames[$lowerName] ?? null;
if ( $origName === null ) {
$origName = $name;
$this->headerNames[$lowerName] = $origName;
$this->headerLines[$origName] = $valueLine;
$this->headerLists[$origName] = $valueParts;
} else {
$this->headerLines[$origName] .= ', ' . $valueLine;
$this->headerLists[$origName] = array_merge( $this->headerLists[$origName],
$valueParts );
}
}
/**
* Remove a header
*
* @param string $name
*/
public function removeHeader( $name ) {
$lowerName = strtolower( $name );
$origName = $this->headerNames[$lowerName] ?? null;
if ( $origName !== null ) {
unset( $this->headerNames[$lowerName] );
unset( $this->headerLines[$origName] );
unset( $this->headerLists[$origName] );
}
}
/**
* Get header arrays indexed by original name
*
* @return string[][]
*/
public function getHeaders() {
return $this->headerLists;
}
/**
* Get the header with a particular name, or an empty array if there is no
* such header.
*
* @param string $name
* @return string[]
*/
public function getHeader( $name ) {
$headerName = $this->headerNames[ strtolower( $name ) ] ?? null;
if ( $headerName === null ) {
return [];
}
return $this->headerLists[$headerName];
}
/**
* Return true if the header exists, false otherwise
* @param string $name
* @return bool
*/
public function hasHeader( $name ) {
return isset( $this->headerNames[ strtolower( $name ) ] );
}
/**
* Get the specified header concatenated into a comma-separated string.
* If the header does not exist, an empty string is returned.
*
* @param string $name
* @return string
*/
public function getHeaderLine( $name ) {
$headerName = $this->headerNames[ strtolower( $name ) ] ?? null;
if ( $headerName === null ) {
return '';
}
return $this->headerLines[$headerName];
}
/**
* Get all header lines
*
* @return string[]
*/
public function getHeaderLines() {
return $this->headerLines;
}
/**
* Get an array of strings of the form "Name: Value", suitable for passing
* directly to header() to set response headers. The PHP manual describes
* these strings as "raw HTTP headers", so we adopt that terminology.
*
* @return string[] Header list (integer indexed)
*/
public function getRawHeaderLines() {
$lines = [];
foreach ( $this->headerNames as $lowerName => $name ) {
if ( $lowerName === 'set-cookie' ) {
// As noted by RFC 7230 section 3.2.2, Set-Cookie is the only
// header for which multiple values cannot be concatenated into
// a single comma-separated line.
foreach ( $this->headerLists[$name] as $value ) {
$lines[] = "$name: $value";
}
} else {
$lines[] = "$name: " . $this->headerLines[$name];
}
}
return $lines;
}
}