Qore WebUtil Module Reference  1.4
WebUtil::FileHandler Class Reference

this class serves files from the file system based on a root location More...

Inheritance diagram for WebUtil::FileHandler:

Public Member Functions

 constructor (string new_file_root, string url_root="/", *hash opt)
 create the object optionally with the given HttpServer::AbstractAuthenticator More...
 
hash handleRequest (HttpServer::HttpListenerInterface listener, Qore::Socket s, hash cx, hash hdr, *data body)
 this method calls handleRequestImpl() to service the request, if handleRequestImpl() returns NOTHING, then it tries to automatically serve a matching template or files from the filesystem or serve the default resource if no resource can be matched More...
 
 logDebug (string fmt)
 default implementation is empty; this method is called with debug log messages; reimplement in subclasses to provide for logging
 
 logError (string fmt)
 default implementation is empty; this method is called with error log messages; reimplement in subclasses to provide for logging
 
 logInfo (string fmt)
 default implementation is empty; this method is called with informational log messages; reimplement in subclasses to provide for logging
 
*hash renderDirectory (hash cx, string path)
 this method is called when a directory should be rendered More...
 

Public Attributes

softint chunk_size = Defaults.ChunkSize
 HTTP chunk size in bytes.
 
softint chunked_threshold = Defaults.ChunkedThreshold
 minimum size in bytes for plain files to be sent with a chnked transfer
 
*string default_target
 the default target if a URL cannot be satisfied
 
const Defaults
 default configuration values
 
const Dirlisting
 dirlisting template
 
const DirSep = Qore::DirSep
 directory separator character More...
 
softint error_level = 0
 set for error info level More...
 
string file_root
 root directory for serving files
 
softlist indexes = (Defaults.IndexTemplate, Defaults.IndexFile)
 indexes for directories; handled in order of appearance
 
hash template_extensions = Defaults.TemplateExtensions
 file extensions handled as templates
 
const Unix = (PlatformOS != "Windows")
 flag for UNIX operating systems
 

Private Member Functions

hash fileError (hash cx, hash sh)
 this method returns a 400 "Bad Request" error code when a file should be served that's not a regular file More...
 
FileStreamRequest getFileStreamRequestImpl (HttpServer::HttpListenerInterface listener, Qore::Socket s, hash cx, hash hdr, *data body, Qore::ReadOnlyFile f, bool txt, string ct)
 must return a FileStreamRequest object to stream the requested file with chunked transfer encoding
 
*hash handleRequestImpl (reference< hash > cx, hash hdr, *data body)
 this method is called by this class's handleRequest() before trying to service the request automatically based on file resources More...
 
hash sendFile (ReadOnlyFile f, bool txt, string ct)
 returns a handler hash response with the file's data to be sent in a monolithic message
 
hash sendFileChunked (HttpServer::HttpListenerInterface listener, Qore::Socket s, hash cx, hash hdr, *data body, Qore::ReadOnlyFile f, bool txt, string ct)
 returns a handler hash response with the file's data to be sent in a HTTP message with chunked transfer encoding
 
hash serverError (hash cx, hash ex)
 this method returns a 500 "Internal Server Error" error code when an exception occurs More...
 
StaticTemplateManager stm ()
 static templates
 
*hash tryServeRequest (HttpServer::HttpListenerInterface listener, Qore::Socket s, hash cx, hash hdr, *data body)
 tries to serve the request from the filesystem
 
hash unhandledRequest (hash cx, hash hdr, *data body)
 this method returns a 404 "Not Found" error code to GET requests and a 501 "Not Implemented" error code to all other requests More...
 
- Private Member Functions inherited from WebUtil::TemplateFileManager
 constructor (int parse_opts=TextTemplateBase::DefaultProgramOptions, *code pgm_setup)
 creates the object with optional Program options More...
 
 purge (string tname)
 this method can be called when a resource is requested that no longer exists in case a template is stored for a file that was deleted
 
hash render (string tname, string path, date mtime, hash ctx, int code=200, *hash hdr)
 explicitly renders the given template with the given path and context argument More...
 

Detailed Description

this class serves files from the file system based on a root location

Member Function Documentation

◆ constructor()

WebUtil::FileHandler::constructor ( string  new_file_root,
string  url_root = "/",
*hash  opt 
)

create the object optionally with the given HttpServer::AbstractAuthenticator

Parameters
new_file_rootthe filesystem root directory for serving files
url_rootthe root part of the URL path without the leading "/"
optan optional with one or more of the following option keys:
  • default_target: the default relative path to use if a request cannot be satisfied
  • po: the Program parse options for the template file programs
  • psetup: an optional closure or call reference taking a single Program argument to be called when initializing template programs to set up a custom template API, etc
  • auth: the authentication object to use to authenticate connections (see HttpServer::AbstractAuthenticator); if no HttpServer::AbstractAuthenticator object is passed, then by default no authentication will be required
  • error_level: the level of error reporting (0, 1, or 2)
  • chunked_threshold: the minimum size for sending files with a chunked transfer encoding
  • chunk_size: the HTTP chunk size for sending files with chunked transfer encoding

◆ fileError()

hash WebUtil::FileHandler::fileError ( hash  cx,
hash  sh 
)
private

this method returns a 400 "Bad Request" error code when a file should be served that's not a regular file

this method is called when a file cannot be served because it's not a regular file; reimplement this method in subclasses to customize error handling

◆ handleRequest()

hash WebUtil::FileHandler::handleRequest ( HttpServer::HttpListenerInterface  listener,
Qore::Socket  s,
hash  cx,
hash  hdr,
*data  body 
)

this method calls handleRequestImpl() to service the request, if handleRequestImpl() returns NOTHING, then it tries to automatically serve a matching template or files from the filesystem or serve the default resource if no resource can be matched

Parameters
listenerthe listener handling the request
sthe socket object for the connection
cxcall context hash; this hash will have the following keys:
  • 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::HttpServer::getListenerInfo())
  • user: the current RBAC username (if any)
hdrincoming 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_url()
  • http_version: the HTTP version number in the request (either "1.0" or "1.1")
bodymessage 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

The following keys are added to the cx argument when calling handleRequestImpl():

  • resource_path: the relative path without any query arguments and with the URL root stripped off (if the request was matched by the URL root, otherwise this will be the request path with any URI query arguments removed)
  • url_root: the root URL
  • file_root: the root directory for serving files
  • isregex: if the url_root string is a regular expression or not (this is always False when this class is used)
  • hdr: this is added to the cx argument directly from the hdr argument, however it also includes the "params" key which holds the URI query parameters as returned in the params key from HttpServer::parse_uri_query()

If handleRequestImpl() returns NOTHING and the requested path cannot be matched and served, then unhandledRequest() is called to handle the error

◆ handleRequestImpl()

*hash WebUtil::FileHandler::handleRequestImpl ( reference< hash cx,
hash  hdr,
*data  body 
)
private

this method is called by this class's handleRequest() before trying to service the request automatically based on file resources

Parameters
cxcall context hash; this hash will have the following keys:
  • 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::HttpServer::getListenerInfo())
  • user: the current RBAC username (if any)
  • resource_path: the relative path without any query arguments and with the URL root stripped off (if the request was matched by the URL root, otherwise this will be the request path with any URI query arguments removed)
  • url_root: the root URL
  • file_root: the root directory for serving files
  • isregex: if the url_root string is a regular expression or not (this is always False when this class is used)
  • hdr: this is a copy of the hdr argument, however it also includes the "params" key which holds the URI query parameters as returned in the params key from HttpServer::parse_uri_query()
hdrincoming 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_url()
  • http_version: the HTTP version number in the request (either "1.0" or "1.1")
  • params: holds the URI query parameters as returned in the params key from HttpServer::parse_uri_query()
bodymessage 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
  • this method has the following additional keys in the cx hash: resource_path, url_root, and isregex
  • the default implementation simply returns NOTHING all requests; reimplement this method in a subclass to provide the required functionality

◆ renderDirectory()

*hash WebUtil::FileHandler::renderDirectory ( hash  cx,
string  path 
)

this method is called when a directory should be rendered

if this method returns NOTHING then any default_target will be used, so to turn off directory rendering, subclass this class and have the reimplemented method return NOTHING

◆ serverError()

hash WebUtil::FileHandler::serverError ( hash  cx,
hash  ex 
)
private

this method returns a 500 "Internal Server Error" error code when an exception occurs

this method is called when an exception occurs; reimplement this method in subclasses to customize error handling

◆ unhandledRequest()

hash WebUtil::FileHandler::unhandledRequest ( hash  cx,
hash  hdr,
*data  body 
)
private

this method returns a 404 "Not Found" error code to GET requests and a 501 "Not Implemented" error code to all other requests

this method is called when a request cannot be handled; reimplement this method in subclasses to customize unhandled request error handling

Member Data Documentation

◆ DirSep

const WebUtil::FileHandler::DirSep = Qore::DirSep

directory separator character

actually defined in Qore, exported here for backwards-compatibility

See also
Qore::DirSep

◆ error_level

softint WebUtil::FileHandler::error_level = 0

set for error info level

The following are valid error levels:

  • 0: no details
  • 1: error summary info
  • 2: complete error details including stack trace (can expose internal implementation details)