finish backend login

backend/api/main.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"encoding/json"
 	"net/http"
 
 	"github.com/fumiama/paper-manager/backend/utils"
@@ -8,8 +9,62 @@ import (
 
 // Handler serves all backend /api call
 func Handler(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path == "/api/getLoginSalt" {
+		if !utils.IsMethod("GET", w, r) {
+			return
+		}
+		username := r.URL.Query().Get("username")
+		if username == "" {
+			http.Error(w, "400 Bad Request: empty username", http.StatusBadRequest)
+			return
+		}
+		salt, err := getLoginSalt(username)
+		if err != nil {
+			writeresult(w, codeError, nil, err.Error(), typeError)
+			return
+		}
+		writeresult(w, codeSuccess, salt, messageOk, typeSuccess)
+		return
+	}
+	if r.URL.Path == "/api/login" {
+		if !utils.IsMethod("POST", w, r) {
+			return
+		}
+		defer r.Body.Close()
+		var body loginbody
+		err := json.NewDecoder(r.Body).Decode(&body)
+		if err != nil {
+			writeresult(w, codeError, nil, err.Error(), typeError)
+			return
+		}
+		r, err := login(body.Username, body.Password)
+		if err != nil {
+			writeresult(w, codeError, nil, err.Error(), typeError)
+			return
+		}
+		writeresult(w, codeSuccess, r, messageOk, typeSuccess)
+		return
+	}
+	if r.URL.Path == "/api/getUserInfo" {
+		if !utils.IsMethod("GET", w, r) {
+			return
+		}
+		token := r.Header.Get("Authorization")
+		r, err := getUserInfo(token)
+		if err != nil {
+			writeresult(w, codeError, nil, err.Error(), typeError)
+			return
+		}
+		writeresult(w, codeSuccess, r, messageOk, typeSuccess)
+		return
+	}
 	if !utils.IsMethod("GET", w, r) {
 		return
 	}
 	http.Error(w, "404 Not Found", http.StatusNotFound)
 }
+
+type loginbody struct {
+	Username string `json:"username"`
+	Password string `json:"password"`
+}