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caddy/middleware/context.go at master · codeskyblue/caddy · GitHub
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context.go
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middleware
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context.go
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package
middleware
import
(
"bytes"
"io/ioutil"
"net"
"net/http"
"net/url"
"strings"
"text/template"
"time"
)
// This file contains the context and functions available for
// use in the templates.
// Context is the context with which Caddy templates are executed.
type
Context
struct
{
Root
http.
FileSystem
Req
*
http.
Request
// This is used to access information about the URL.
URL
*
url.
URL
}
// Include returns the contents of filename relative to the site root
func
(
c
Context
)
Include
(
filename
string
) (
string
,
error
) {
file
,
err
:=
c
.
Root
.
Open
(
filename
)
if
err
!=
nil
{
return
""
,
err
}
defer
file
.
Close
()
body
,
err
:=
ioutil
.
ReadAll
(
file
)
if
err
!=
nil
{
return
""
,
err
}
tpl
,
err
:=
template
.
New
(
filename
).
Parse
(
string
(
body
))
if
err
!=
nil
{
return
""
,
err
}
var
buf
bytes.
Buffer
err
=
tpl
.
Execute
(
&
buf
,
c
)
if
err
!=
nil
{
return
""
,
err
}
return
buf
.
String
(),
nil
}
// Now returns the current timestamp in the specified format.
func
(
c
Context
)
Now
(
format
string
)
string
{
return
time
.
Now
().
Format
(
format
)
}
// NowDate returns the current date/time that can be used
// in other time functions.
func
(
c
Context
)
NowDate
() time.
Time
{
return
time
.
Now
()
}
// Cookie gets the value of a cookie with name name.
func
(
c
Context
)
Cookie
(
name
string
)
string
{
cookies
:=
c
.
Req
.
Cookies
()
for
_
,
cookie
:=
range
cookies
{
if
cookie
.
Name
==
name
{
return
cookie
.
Value
}
}
return
""
}
// Header gets the value of a request header with field name.
func
(
c
Context
)
Header
(
name
string
)
string
{
return
c
.
Req
.
Header
.
Get
(
name
)
}
// IP gets the (remote) IP address of the client making the request.
func
(
c
Context
)
IP
()
string
{
ip
,
_
,
err
:=
net
.
SplitHostPort
(
c
.
Req
.
RemoteAddr
)
if
err
!=
nil
{
return
c
.
Req
.
RemoteAddr
}
return
ip
}
// URI returns the raw, unprocessed request URI (including query
// string and hash) obtained directly from the Request-Line of
// the HTTP request.
func
(
c
Context
)
URI
()
string
{
return
c
.
Req
.
RequestURI
}
// Host returns the hostname portion of the Host header
// from the HTTP request.
func
(
c
Context
)
Host
() (
string
,
error
) {
host
,
_
,
err
:=
net
.
SplitHostPort
(
c
.
Req
.
Host
)
if
err
!=
nil
{
if
!
strings
.
Contains
(
c
.
Req
.
Host
,
":"
) {
// common with sites served on the default port 80
return
c
.
Req
.
Host
,
nil
}
return
""
,
err
}
return
host
,
nil
}
// Port returns the port portion of the Host header if specified.
func
(
c
Context
)
Port
() (
string
,
error
) {
_
,
port
,
err
:=
net
.
SplitHostPort
(
c
.
Req
.
Host
)
if
err
!=
nil
{
if
!
strings
.
Contains
(
c
.
Req
.
Host
,
":"
) {
// common with sites served on the default port 80
return
"80"
,
nil
}
return
""
,
err
}
return
port
,
nil
}
// Method returns the method (GET, POST, etc.) of the request.
func
(
c
Context
)
Method
()
string
{
return
c
.
Req
.
Method
}
// PathMatches returns true if the path portion of the request
// URL matches pattern.
func
(
c
Context
)
PathMatches
(
pattern
string
)
bool
{
return
Path
(
c
.
Req
.
URL
.
Path
).
Matches
(
pattern
)
}
// Truncate truncates the input string to the given length. If
// input is shorter than length, the entire string is returned.
func
(
c
Context
)
Truncate
(
input
string
,
length
int
)
string
{
if
len
(
input
)
>
length
{
return
input
[:
length
]
}
return
input
}
// StripHTML returns s without HTML tags. It is fairly naive
// but works with most valid HTML inputs.
func
(
c
Context
)
StripHTML
(
s
string
)
string
{
var
buf
bytes.
Buffer
var
inTag
,
inQuotes
bool
var
tagStart
int
for
i
,
ch
:=
range
s
{
if
inTag
{
if
ch
==
'>'
&&
!
inQuotes
{
inTag
=
false
}
else
if
ch
==
'<'
&&
!
inQuotes
{
// false start
buf
.
WriteString
(
s
[
tagStart
:
i
])
tagStart
=
i
}
else
if
ch
==
'"'
{
inQuotes
=
!
inQuotes
}
continue
}
if
ch
==
'<'
{
inTag
=
true
tagStart
=
i
continue
}
buf
.
WriteRune
(
ch
)
}
if
inTag
{
// false start
buf
.
WriteString
(
s
[
tagStart
:])
inTag
=
false
}
return
buf
.
String
()
}
// StripExt returns the input string without the extension,
// which is the suffix starting with the final '.' character
// but not before the final path separator ('/') character.
// If there is no extension, the whole input is returned.
func
(
c
Context
)
StripExt
(
path
string
)
string
{
for
i
:=
len
(
path
)
-
1
;
i
>=
0
&&
path
[
i
]
!=
'/'
;
i
--
{
if
path
[
i
]
==
'.'
{
return
path
[:
i
]
}
}
return
path
}
// Replace replaces instances of find in input with replacement.
func
(
c
Context
)
Replace
(
input
,
find
,
replacement
string
)
string
{
return
strings
.
Replace
(
input
,
find
,
replacement
,
-
1
)
}
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