HttpServer::AbstractHttpRequestHandler Class Reference

abstract class that all HTTP request handler objects must inherit from More...

Inheritance diagram for HttpServer::AbstractHttpRequestHandler:

Public Member Methods
	constructor (*AbstractAuthenticator n_auth, softbool n_stream=False)
	create the object optionally with the given AbstractAuthenticator More...
*data	getMessageBody (Socket s, hash< auto > hdr, *data body, bool decode=True)
	optionally retrieves and post-processes any message body
hash< HttpResponseInfo >	handleRequest (hash< auto > cx, hash< auto > hdr, *data body)
	will be called when a request is received that should be directed to the handler More...
hash< HttpResponseInfo >	handleRequest (HttpListenerInterface listener, Socket s, hash< auto > cx, hash< auto > hdr, *data body)
	top-level request handling method
bool	isPersistent ()
	returns True if the current connection is persistent, False if not
string	maskData (string msg)
	this method can be used to mask data in debug messages More...
	notifyClosed (*code c)
	calls the argument when the persistent connection is closed
nothing	persistentClosed ()
	called externally when a persistent connection is closed
	restoreThreadLocalData (*hash data)
	called after handleRequest() with any data returned from saveThreadData() More...
*hash	saveThreadLocalData ()
	called before handleRequest() any data returned here will be given to restoreThreadLocalData() after the handleRequest() call More...
	setPersistent (bool p=True)
	called externally to notify the handler that the connection will be persistent

Static Public Member Methods
static data	decodeBody (string ce, binary body, *string enc)
	decodes a message body with content-encoding
static binary	encodeBody (string ce, data body)
	encodes a message body with content-encoding
static *string	getLogMessage (hash< auto > cx, hash api, reference params, *reference< string > args)
	helper method for handling log messages More...
static hash< HttpResponseInfo >	make400 (string fmt)
	creates a hash for an HTTP 400 error response with the response message body as a string
static hash< HttpResponseInfo >	make400 (hash< auto > hdr, string fmt)
	creates a hash for an HTTP 400 error response with the response message body as a string
static hash< HttpResponseInfo >	make501 (string fmt)
	creates a hash for an HTTP 501 error response with the response message body as a string
static hash< HttpResponseInfo >	make501 (hash< auto > hdr, string fmt)
	creates a hash for an HTTP 501 error response with the response message body as a string
static hash< HttpResponseInfo >	makeResponse (int code, string fmt)
	creates a hash for an HTTP response with the response code and the response message body as a formatted string
static hash< HttpResponseInfo >	makeResponse (hash< auto > hdr, int code, string fmt)
	creates a hash for an HTTP response with the response code and the response message body as a formatted string
static hash< HttpResponseInfo >	makeResponse (int code, *data body, *hash< auto > hdr)
	creates a hash for an HTTP response with the response code and a literal response message body
static hash< HttpResponseInfo >	redirect (hash< auto > cx, hash< auto > hdr, string path)
	generates a redirect hash for the given path
static	staticNotificationCleanup ()
	removes the thread-local data key in case the object is destroyed in another thread
static	staticPersistenceCleanup ()
	removes the thread-local data key in case the object is destroyed in another thread

Public Attributes
*AbstractAuthenticator	auth
	the optional AbstractAuthenticator for requests to this handler
bool	decompress = True
	if POSTed data should be decompressed automatically if there is content-encoding
bool	decompress_to_string = True
	if automatically decompressed POSTed data should be converted to a string (if False, then it will be decompressed to a binary)
const	NotificationThreadKey = "_AHRH_pc"
	thread-local key string for notification callbacks
const	PersistenceThreadKey = "_AHRH_p"
	thread-local key string for the persistent flag
bool	stream
	if the handler supports streaming requests/responses with chunked data
timeout	timeout_ms = HttpServer::DefaultTimeout
	send and receive socket timeout in milliseconds

Private Member Methods
nothing	checkPersistent (hash< auto > cx, hash< auto > hdr)
	this method will throw an exception if a persistent connection cannot be granted
AbstractStreamRequest	getStreamRequestImpl (HttpListenerInterface listener, Socket s, hash< auto > cx, hash< auto > hdr, *data body)
	returns the AbstractStreamRequest object for handling chunked requests

Detailed Description

abstract class that all HTTP request handler objects must inherit from

Reimplement handleRequest() in subclasses

For handlers supporting chunked data (both for receiving and sending), set stream to True in the constructor() method and implement getStreamRequestImpl() to return the HTTP stream request handler.

See also

AbstractStreamRequest for information about HTTP stream request handlers

Member Function Documentation

constructor()

HttpServer::AbstractHttpRequestHandler::constructor	(	*AbstractAuthenticator	n_auth,
		softbool	n_stream = False
	)

create the object optionally with the given AbstractAuthenticator

Parameters

n_auth	the authentication object to use to authenticate connections (see AbstractAuthenticator); if no AbstractAuthenticator object is passed, then by default no authentication will be required
n_stream	if True then stream (i.e. HTTP chunked) requests and responses are handled and getStreamRequestImpl() will be used to return a valid AbstractStreamRequest object to handle requests

getLogMessage()

static *string HttpServer::AbstractHttpRequestHandler::getLogMessage ( hash< auto >  cx, hash  api, reference  params, *reference< string >  args  )

static

helper method for handling log messages

Parameters

cx	the call context hash; this hash will have the following keys: header-info: a hash of information about the request header with the following keys: request-uri: gives the request URI in an HTTP request body-content-type: this is the "Content-Type" header without any charset declaration charset: if there is a charset declaration in the "Content-Type" header, the value is returned in this key close: set to True if the connection should be closed after responding, False if not (as derived from the request header) accept-charset: this key will be set to an appropriate value from any "Accept-Charset" header; if any of "*", "utf8", or "utf-8" are present, then this will be set to "utf8", otherwise it will be set to the first requested character encoding in the list accept-encoding: a hash where keys are values from any "Accept-Encoding" header and the values are True socket: the bind address used to bind the listener ("socket-info" provides more detailed information) socket-info: a hash of socket information for the listening socket (as returned by Qore::Socket::getSocketInfo()) peer-info: a hash of socket information for the remote socket (as returned by Qore::Socket::getPeerInfo()) url: a hash of broken-down URL information (as returned from Qore::parse_url()) id: the unique HTTP connection ID ssl: True if the request was encrypted with HTTPS, False if not listener-id: the HTTP server listener ID (see HttpServer::getListenerInfo()) user: the current RBAC username (if any) root_path: the root URL path matched if the request was matched by a URL prefix
api	the API description hash
params	a reference to the call parameters; the call context hash will be added as the first argument
args	an optional reference to a string describing the arguments

Returns

a string if the message should be logged, otherwise NOTHING

handleRequest()

hash<HttpResponseInfo> HttpServer::AbstractHttpRequestHandler::handleRequest	(	hash< auto >	cx,
		hash< auto >	hdr,
		*data	body
	)

will be called when a request is received that should be directed to the handler

Parameters

cx	call context hash; this hash will have the following keys: header-info: a hash of information about the request header with the following keys: request-uri: gives the request URI in an HTTP request body-content-type: this is the "Content-Type" header without any charset declaration charset: if there is a charset declaration in the "Content-Type" header, the value is returned in this key close: set to True if the connection should be closed after responding, False if not (as derived from the request header) accept-charset: this key will be set to an appropriate value from any "Accept-Charset" header; if any of "*", "utf8", or "utf-8" are present, then this will be set to "utf8", otherwise it will be set to the first requested character encoding in the list accept-encoding: a hash where keys are values from any "Accept-Encoding" header and the values are True socket: the bind address used to bind the listener ("socket-info" provides more detailed information) socket-info: a hash of socket information for the listening socket (as returned by Qore::Socket::getSocketInfo()) peer-info: a hash of socket information for the remote socket (as returned by Qore::Socket::getPeerInfo()) url: a hash of broken-down URL information (as returned from Qore::parse_url()) id: the unique HTTP connection ID ssl: True if the request was encrypted with HTTPS, False if not listener-id: the HTTP server listener ID (see HttpServer::getListenerInfo()) user: the current RBAC username (if any) root_path: the root URL path matched if the request was matched by a URL prefix
hdr	incoming header hash; all keys will be converted to lower-case, additionally the following keys will be present: method: the HTTP method received (ie "GET", "POST", etc) path: the HTTP path given in the request, after processing by Qore::decode_uri_request() http_version: the HTTP version number in the request (either "1.0" or "1.1")
body	message body, if any

Returns

a hash with the following keys:

• "code": the HTTP return code (see HttpServer::HttpCodes)
• "body": the message body to return in the response
• "close": (optional) set this key to True if the connection should be unconditionally closed when the handler returns
• "hdr": (optional) set this key to a hash of extra header information to be returned with the response

Note

the default implementation simply returns a 501 error code for all requests; reimplement this method in a subclass to provide the required functionality

maskData()

string HttpServer::AbstractHttpRequestHandler::maskData

(

string

msg

)

this method can be used to mask data in debug messages

Parameters

msg	the log message to be subjected to masking

Returns

a string with sensitive information masked

restoreThreadLocalData()

HttpServer::AbstractHttpRequestHandler::restoreThreadLocalData

(

*hash

data

)

called after handleRequest() with any data returned from saveThreadData()

Note

the default implementation does nothing

saveThreadLocalData()

*hash HttpServer::AbstractHttpRequestHandler::saveThreadLocalData

(

)

called before handleRequest() any data returned here will be given to restoreThreadLocalData() after the handleRequest() call

Note

the default implementation does nothing