You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
1.3 KiB
51 lines
1.3 KiB
package middleware
|
|
|
|
import (
|
|
"net/http"
|
|
"strings"
|
|
)
|
|
|
|
// ContentCharset generates a handler that writes a 415 Unsupported Media Type response if none of the charsets match.
|
|
// An empty charset will allow requests with no Content-Type header or no specified charset.
|
|
func ContentCharset(charsets ...string) func(next http.Handler) http.Handler {
|
|
for i, c := range charsets {
|
|
charsets[i] = strings.ToLower(c)
|
|
}
|
|
|
|
return func(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
if !contentEncoding(r.Header.Get("Content-Type"), charsets...) {
|
|
w.WriteHeader(http.StatusUnsupportedMediaType)
|
|
return
|
|
}
|
|
|
|
next.ServeHTTP(w, r)
|
|
})
|
|
}
|
|
}
|
|
|
|
// Check the content encoding against a list of acceptable values.
|
|
func contentEncoding(ce string, charsets ...string) bool {
|
|
_, ce = split(strings.ToLower(ce), ";")
|
|
_, ce = split(ce, "charset=")
|
|
ce, _ = split(ce, ";")
|
|
for _, c := range charsets {
|
|
if ce == c {
|
|
return true
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// Split a string in two parts, cleaning any whitespace.
|
|
func split(str, sep string) (string, string) {
|
|
var a, b string
|
|
var parts = strings.SplitN(str, sep, 2)
|
|
a = strings.TrimSpace(parts[0])
|
|
if len(parts) == 2 {
|
|
b = strings.TrimSpace(parts[1])
|
|
}
|
|
|
|
return a, b
|
|
}
|
|
|