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auth.go
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auth.go
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package app
import (
"encoding/base64"
"errors"
"net/http"
"strings"
)
func authMiddleware(handler http.Handler, um UserManager) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
authString := r.Header.Get("Authorization")
if len(authString) == 0 {
respondStatusUnauthorized(w, r)
} else {
name, password, err := decodeAuthHeader(authString)
if err != nil {
respondStatusUnauthorized(w, r)
}
isValidUser := um.ValidateUser(name, password)
if isValidUser {
handler.ServeHTTP(w, r)
} else {
respondStatusUnauthorized(w, r)
}
}
})
}
func decodeAuthHeader(authString string) (name string, password string, err error) {
if !strings.HasPrefix(authString, "Basic ") {
err = errors.New("invalid authorization header: unknown authorization scheme")
return
}
encodedPart := authString[6:]
credentials, err := base64.StdEncoding.DecodeString(encodedPart)
if err != nil {
return
}
userData := strings.SplitN(string(credentials), ":", 2)
if len(userData) < 2 {
err = errors.New("invalid authorization header: bad user password format")
return
}
name = userData[0]
password = userData[1]
return
}