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34 lines
852 B
34 lines
852 B
package middleware
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import (
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"crypto/subtle"
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"fmt"
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"net/http"
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)
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// BasicAuth implements a simple middleware handler for adding basic http auth to a route.
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func BasicAuth(realm string, creds map[string]string) func(next http.Handler) http.Handler {
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return func(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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user, pass, ok := r.BasicAuth()
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if !ok {
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basicAuthFailed(w, realm)
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return
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}
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credPass, credUserOk := creds[user]
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if !credUserOk || subtle.ConstantTimeCompare([]byte(pass), []byte(credPass)) != 1 {
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basicAuthFailed(w, realm)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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}
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func basicAuthFailed(w http.ResponseWriter, realm string) {
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w.Header().Add("WWW-Authenticate", fmt.Sprintf(`Basic realm="%s"`, realm))
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w.WriteHeader(http.StatusUnauthorized)
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}
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