login-validator: talk to remote validator to register new users

pkg/login-validator/cmd/login.go

@@ -1,9 +1,11 @@
 package main
 
 import (
+	"bytes"
 	"crypto/hmac"
 	"crypto/sha512"
 	"crypto/tls"
+	"encoding/base64"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -15,6 +17,7 @@ import (
 	"path"
 	"strings"
 	"text/template"
+	"time"
 
 	"gopkg.in/ldap.v2"
 )
@@ -152,6 +155,12 @@ func (l loginChecker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
+	if err := l.registerUser(lu.Username, r.RemoteAddr); err != nil {
+		log.Println("Error on remote registration:", err)
+		http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
+		return
+	}
+
 	if err := l.lateLoginAction(lu.Username, r.RemoteAddr); err != nil {
 		log.Println("Error on late login action:", err)
 		http.Error(w, "Internal server error. Please retry in a few minutes", http.StatusInternalServerError)
@@ -162,6 +171,32 @@ func (l loginChecker) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	http.Error(w, "Success", http.StatusOK)
 }
 
+func (l loginChecker) registerUser(username, remoteAddr string) error {
+	bts, err := json.Marshal(map[string]interface{}{"login": username})
+	if err != nil {
+		return nil
+	}
+
+	req, err := http.NewRequest("POST", "https://adlin.nemunai.re/api/students/", bytes.NewReader(bts))
+	if err != nil {
+		return err
+	}
+	req.Header.Add("X-ADLIN-Authentication", base64.StdEncoding.EncodeToString(hmac.New(sha512.New, []byte(loginSalt)).Sum([]byte(fmt.Sprintf("%d", time.Now().Unix()/10)))))
+	req.Header.Set("Content-Type", "application/json")
+
+	client := &http.Client{}
+	resp, err := client.Do(req)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return errors.New(resp.Status)
+	} else {
+		return nil
+	}
+}
+
 func (l loginChecker) lateLoginAction(username, remoteAddr string) error {
 	// Find corresponding MAC
 	var fname string