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NodeJsApp/node_modules/finalhandler/index.js at master · Neerav006/NodeJsApp · GitHub
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finalhandler
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finalhandler
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index.js
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/*!
* finalhandler
* Copyright(c) 2014-2017 Douglas Christopher Wilson
* MIT Licensed
*/
'use strict'
/**
* Module dependencies.
*
@private
*/
var
debug
=
require
(
'debug'
)
(
'finalhandler'
)
var
encodeUrl
=
require
(
'encodeurl'
)
var
escapeHtml
=
require
(
'escape-html'
)
var
onFinished
=
require
(
'on-finished'
)
var
parseUrl
=
require
(
'parseurl'
)
var
statuses
=
require
(
'statuses'
)
var
unpipe
=
require
(
'unpipe'
)
/**
* Module variables.
*
@private
*/
var
DOUBLE_SPACE_REGEXP
=
/
\x20
{
2
}
/
g
var
NEWLINE_REGEXP
=
/
\n
/
g
/* istanbul ignore next */
var
defer
=
typeof
setImmediate
===
'function'
?
setImmediate
:
function
(
fn
)
{
process
.
nextTick
(
fn
.
bind
.
apply
(
fn
,
arguments
)
)
}
var
isFinished
=
onFinished
.
isFinished
/**
* Create a minimal HTML document.
*
*
@param
{
string
} message
*
@private
*/
function
createHtmlDocument
(
message
)
{
var
body
=
escapeHtml
(
message
)
.
replace
(
NEWLINE_REGEXP
,
'<br>'
)
.
replace
(
DOUBLE_SPACE_REGEXP
,
' '
)
return
'<!DOCTYPE html>\n'
+
'<html lang="en">\n'
+
'<head>\n'
+
'<meta charset="utf-8">\n'
+
'<title>Error</title>\n'
+
'</head>\n'
+
'<body>\n'
+
'<pre>'
+
body
+
'</pre>\n'
+
'</body>\n'
+
'</html>\n'
}
/**
* Module exports.
*
@public
*/
module
.
exports
=
finalhandler
/**
* Create a function to handle the final response.
*
*
@param
{
Request
} req
*
@param
{
Response
} res
*
@param
{
Object
} [options]
*
@return
{
Function
}
*
@public
*/
function
finalhandler
(
req
,
res
,
options
)
{
var
opts
=
options
||
{
}
// get environment
var
env
=
opts
.
env
||
process
.
env
.
NODE_ENV
||
'development'
// get error callback
var
onerror
=
opts
.
onerror
return
function
(
err
)
{
var
headers
var
msg
var
status
// ignore 404 on in-flight response
if
(
!
err
&&
headersSent
(
res
)
)
{
debug
(
'cannot 404 after headers sent'
)
return
}
// unhandled error
if
(
err
)
{
// respect status code from error
status
=
getErrorStatusCode
(
err
)
if
(
status
===
undefined
)
{
// fallback to status code on response
status
=
getResponseStatusCode
(
res
)
}
else
{
// respect headers from error
headers
=
getErrorHeaders
(
err
)
}
// get error message
msg
=
getErrorMessage
(
err
,
status
,
env
)
}
else
{
// not found
status
=
404
msg
=
'Cannot '
+
req
.
method
+
' '
+
encodeUrl
(
getResourceName
(
req
)
)
}
debug
(
'default %s'
,
status
)
// schedule onerror callback
if
(
err
&&
onerror
)
{
defer
(
onerror
,
err
,
req
,
res
)
}
// cannot actually respond
if
(
headersSent
(
res
)
)
{
debug
(
'cannot %d after headers sent'
,
status
)
req
.
socket
.
destroy
(
)
return
}
// send response
send
(
req
,
res
,
status
,
headers
,
msg
)
}
}
/**
* Get headers from Error object.
*
*
@param
{
Error
} err
*
@return
{
object
}
*
@private
*/
function
getErrorHeaders
(
err
)
{
if
(
!
err
.
headers
||
typeof
err
.
headers
!==
'object'
)
{
return
undefined
}
var
headers
=
Object
.
create
(
null
)
var
keys
=
Object
.
keys
(
err
.
headers
)
for
(
var
i
=
0
;
i
<
keys
.
length
;
i
++
)
{
var
key
=
keys
[
i
]
headers
[
key
]
=
err
.
headers
[
key
]
}
return
headers
}
/**
* Get message from Error object, fallback to status message.
*
*
@param
{
Error
} err
*
@param
{
number
} status
*
@param
{
string
} env
*
@return
{
string
}
*
@private
*/
function
getErrorMessage
(
err
,
status
,
env
)
{
var
msg
if
(
env
!==
'production'
)
{
// use err.stack, which typically includes err.message
msg
=
err
.
stack
// fallback to err.toString() when possible
if
(
!
msg
&&
typeof
err
.
toString
===
'function'
)
{
msg
=
err
.
toString
(
)
}
}
return
msg
||
statuses
[
status
]
}
/**
* Get status code from Error object.
*
*
@param
{
Error
} err
*
@return
{
number
}
*
@private
*/
function
getErrorStatusCode
(
err
)
{
// check err.status
if
(
typeof
err
.
status
===
'number'
&&
err
.
status
>=
400
&&
err
.
status
<
600
)
{
return
err
.
status
}
// check err.statusCode
if
(
typeof
err
.
statusCode
===
'number'
&&
err
.
statusCode
>=
400
&&
err
.
statusCode
<
600
)
{
return
err
.
statusCode
}
return
undefined
}
/**
* Get resource name for the request.
*
* This is typically just the original pathname of the request
* but will fallback to "resource" is that cannot be determined.
*
*
@param
{
IncomingMessage
} req
*
@return
{
string
}
*
@private
*/
function
getResourceName
(
req
)
{
try
{
return
parseUrl
.
original
(
req
)
.
pathname
}
catch
(
e
)
{
return
'resource'
}
}
/**
* Get status code from response.
*
*
@param
{
OutgoingMessage
} res
*
@return
{
number
}
*
@private
*/
function
getResponseStatusCode
(
res
)
{
var
status
=
res
.
statusCode
// default status code to 500 if outside valid range
if
(
typeof
status
!==
'number'
||
status
<
400
||
status
>
599
)
{
status
=
500
}
return
status
}
/**
* Determine if the response headers have been sent.
*
*
@param
{
object
} res
*
@returns
{
boolean
}
*
@private
*/
function
headersSent
(
res
)
{
return
typeof
res
.
headersSent
!==
'boolean'
?
Boolean
(
res
.
_header
)
:
res
.
headersSent
}
/**
* Send response.
*
*
@param
{
IncomingMessage
} req
*
@param
{
OutgoingMessage
} res
*
@param
{
number
} status
*
@param
{
object
} headers
*
@param
{
string
} message
*
@private
*/
function
send
(
req
,
res
,
status
,
headers
,
message
)
{
function
write
(
)
{
// response body
var
body
=
createHtmlDocument
(
message
)
// response status
res
.
statusCode
=
status
res
.
statusMessage
=
statuses
[
status
]
// response headers
setHeaders
(
res
,
headers
)
// security headers
res
.
setHeader
(
'Content-Security-Policy'
,
"default-src 'self'"
)
res
.
setHeader
(
'X-Content-Type-Options'
,
'nosniff'
)
// standard headers
res
.
setHeader
(
'Content-Type'
,
'text/html; charset=utf-8'
)
res
.
setHeader
(
'Content-Length'
,
Buffer
.
byteLength
(
body
,
'utf8'
)
)
if
(
req
.
method
===
'HEAD'
)
{
res
.
end
(
)
return
}
res
.
end
(
body
,
'utf8'
)
}
if
(
isFinished
(
req
)
)
{
write
(
)
return
}
// unpipe everything from the request
unpipe
(
req
)
// flush the request
onFinished
(
req
,
write
)
req
.
resume
(
)
}
/**
* Set response headers from an object.
*
*
@param
{
OutgoingMessage
} res
*
@param
{
object
} headers
*
@private
*/
function
setHeaders
(
res
,
headers
)
{
if
(
!
headers
)
{
return
}
var
keys
=
Object
.
keys
(
headers
)
for
(
var
i
=
0
;
i
<
keys
.
length
;
i
++
)
{
var
key
=
keys
[
i
]
res
.
setHeader
(
key
,
headers
[
key
]
)
}
}
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