forgejo/vendor/github.com/go-chi/chi/middleware/content_charset.go
Lunny Xiao c296f4fed6
Introduce go chi web framework as frontend of macaron, so that we can move routes from macaron to chi step by step (#7420)
* When route cannot be found on chi, go to macaron

* Stick chi version to 1.5.0

* Follow router log setting
2020-11-13 14:51:07 +02:00

51 lines
1.3 KiB
Go
Vendored

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
}