/
filters.go
62 lines (53 loc) · 1.38 KB
/
filters.go
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package server
import (
"fmt"
"net/http"
"strconv"
)
func mFilter(method string, next http.Handler) http.HandlerFunc {
return func(rw http.ResponseWriter, r *http.Request) {
if r.Method == method {
next.ServeHTTP(rw, r)
} else {
rw.WriteHeader(http.StatusMethodNotAllowed)
}
}
}
func contentLengthFilter(next http.Handler) http.HandlerFunc {
return func(rw http.ResponseWriter, r *http.Request) {
length, err := strconv.Atoi(r.Header.Get("Content-Length"))
if err != nil || length == 0 {
rw.WriteHeader(400)
rw.Write([]byte("Empty content not allowed"))
} else {
next.ServeHTTP(rw, r)
}
}
}
func headersFilter(headers []string, next http.Handler) http.HandlerFunc {
return func(rw http.ResponseWriter, r *http.Request) {
for _, v := range headers {
hdr := r.Header.Get(v)
if hdr == "" {
rw.WriteHeader(400)
rw.Write([]byte(fmt.Sprintf("header %s is not present", v)))
return
}
}
next.ServeHTTP(rw, r)
}
}
func corsHeader(next http.Handler) http.HandlerFunc {
return func(rw http.ResponseWriter, r *http.Request) {
rw.Header().Add("Access-Control-Allow-Origin", "*")
next.ServeHTTP(rw, r)
}
}
func addHeadersFilter(hdrs map[string]string, next http.Handler) http.HandlerFunc {
return func(rw http.ResponseWriter, r *http.Request) {
for name, value := range hdrs {
rw.Header().Add(name, value)
}
next.ServeHTTP(rw, r)
}
}