/
middleware.go
65 lines (54 loc) · 2.03 KB
/
middleware.go
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/*
Copyright © 2020 Yale University
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package api
import (
"net/http"
"net/url"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/bcrypt"
)
// TokenMiddleware checks the tokens for non-public URLs
func TokenMiddleware(psk []byte, public map[string]string, h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Debug("Processing token middleware for protected URLs")
// Handle CORS preflight checks
if r.Method == "OPTIONS" {
log.Info("Setting CORS preflight options and returning")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Access-Control-Allow-Headers", "X-Auth-Token")
w.WriteHeader(http.StatusOK)
w.Write([]byte{})
return
}
uri, err := url.ParseRequestURI(r.RequestURI)
if err != nil {
log.Error("Unable to parse request URI ", err)
w.WriteHeader(http.StatusForbidden)
return
}
if _, ok := public[uri.Path]; ok {
log.Infof("Not authenticating for '%s'", uri.Path)
} else {
log.Infof("Authenticating token for protected URL '%s'", r.URL)
htoken := r.Header.Get("X-Auth-Token")
if err := bcrypt.CompareHashAndPassword([]byte(htoken), psk); err != nil {
log.Warnf("Unable to authenticate session for URL '%s' with error '%s'", r.URL, err)
w.WriteHeader(http.StatusForbidden)
return
}
}
log.Infof("Successfully authenticated token for URL '%s'", r.URL)
h.ServeHTTP(w, r)
})
}