Add: backend session support and bug fix

go.mod

@@ -2,4 +2,7 @@ module msw-open-music
 
 go 1.16
 
-require github.com/mattn/go-sqlite3 v1.14.7 // indirect
+require (
+	github.com/gorilla/sessions v1.2.1
+	github.com/mattn/go-sqlite3 v1.14.7
+)

go.sum

@@ -1,2 +1,6 @@
+github.com/gorilla/securecookie v1.1.1 h1:miw7JPhV+b/lAHSXz4qd/nN9jRiAFV5FwjeKyCS8BvQ=
+github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
+github.com/gorilla/sessions v1.2.1 h1:DHd3rPN5lE3Ts3D8rKkQ8x/0kqfeNmBAaiSi+o7FsgI=
+github.com/gorilla/sessions v1.2.1/go.mod h1:dk2InVEVJ0sfLlnXv9EAgkf6ecYs/i80K/zI+bUmuGM=
 github.com/mattn/go-sqlite3 v1.14.7 h1:fxWBnXkxfM6sRiuH3bqJ4CfzZojMOLVc0UTsTglEghA=
 github.com/mattn/go-sqlite3 v1.14.7/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=

pkg/api/api.go

@@ -1,9 +1,11 @@
 package api
 
 import (
+	"github.com/gorilla/sessions"
 	"msw-open-music/pkg/database"
 	"msw-open-music/pkg/tmpfs"
 	"net/http"
+	"os"
 )
 
 type API struct {
@@ -12,6 +14,8 @@ type API struct {
 	token     string
 	APIConfig APIConfig
 	Tmpfs     *tmpfs.Tmpfs
+	store     *sessions.CookieStore
+  defaultSessionName string
 }
 
 func NewAPIConfig() APIConfig {
@@ -43,6 +47,8 @@ func NewAPI(config Config) (*API, error) {
 		return nil, err
 	}
 
+  store := sessions.NewCookieStore([]byte(os.Getenv("SESSION_KEY")))
+
 	mux := http.NewServeMux()
 	apiMux := http.NewServeMux()
 
@@ -53,6 +59,8 @@ func NewAPI(config Config) (*API, error) {
 			Handler: mux,
 		},
 		APIConfig: apiConfig,
+    store: store,
+    defaultSessionName: "msw-open-music",
 	}
 	api.Tmpfs = tmpfs.NewTmpfs(tmpfsConfig)
 

pkg/api/handle_user.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"database/sql"
 	"encoding/json"
 	"log"
 	"msw-open-music/pkg/database"
@@ -16,21 +17,65 @@ type LoginResponse struct {
 	User *database.User `json:"user"`
 }
 
-func (api *API) HandleLogin(w http.ResponseWriter, r *http.Request) {
-	// Get method will login as anonymous user
-	if r.Method == "GET" {
-		log.Println("Login as anonymous user")
+func (api *API) LoginAsAnonymous(w http.ResponseWriter, r *http.Request) {
 	user, err := api.Db.LoginAsAnonymous()
 	if err != nil {
 		api.HandleError(w, r, err)
 		return
 	}
+
+	session, _ := api.store.Get(r, api.defaultSessionName)
+
+	// save session
+	session.Values["userId"] = user.ID
+	err = session.Save(r, w)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
+
 	resp := &LoginResponse{
 		User: user,
 	}
+
 	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		api.HandleError(w, r, err)
 		return
 	}
+}
+
+func (api *API) HandleLogin(w http.ResponseWriter, r *http.Request) {
+	var user *database.User
+	var err error
+	session, _ := api.store.Get(r, api.defaultSessionName)
+	log.Println("Session:", session.Values)
+
+	// Get method will login current or anonymous user
+	if r.Method == "GET" {
+
+		// if user already logged in
+		if userId, ok := session.Values["userId"]; ok {
+			user, err = api.Db.GetUserById(userId.(int64))
+			if err != nil {
+				if err != sql.ErrNoRows {
+					api.HandleError(w, r, err)
+					return
+				}
+				log.Println("User not found")
+				// login as anonymous user
+				api.LoginAsAnonymous(w, r)
+				return
+			}
+			log.Println("User already logged in:", user)
+
+		} else {
+			// login as anonymous user
+			log.Println("Login as anonymous user")
+			api.LoginAsAnonymous(w, r)
+		}
+
+	} else {
 
 		var request LoginRequest
 		err := json.NewDecoder(r.Body).Decode(&request)
@@ -41,7 +86,16 @@ func (api *API) HandleLogin(w http.ResponseWriter, r *http.Request) {
 
 		log.Println("Login as user", request.Username)
 
-	user, err := api.Db.Login(request.Username, request.Password)
+		user, err = api.Db.Login(request.Username, request.Password)
+		if err != nil {
+			api.HandleError(w, r, err)
+			return
+		}
+	}
+
+	// save session
+	session.Values["userId"] = user.ID
+	err = session.Save(r, w)
 	if err != nil {
 		api.HandleError(w, r, err)
 		return
@@ -73,11 +127,19 @@ func (api *API) HandleRegister(w http.ResponseWriter, r *http.Request) {
 
 	log.Println("Register user", request.Username)
 
-	err = api.Db.Register(request.Username, request.Password, request.Role)
+	user, err := api.Db.Register(request.Username, request.Password, request.Role)
 	if err != nil {
 		api.HandleError(w, r, err)
 		return
 	}
 
-	api.HandleOK(w, r)
+	resp := &LoginResponse{
+		User: user,
+	}
+
+	err = json.NewEncoder(w).Encode(resp)
+	if err != nil {
+		api.HandleError(w, r, err)
+		return
+	}
 }

pkg/database/method_user.go

@@ -22,10 +22,21 @@ func (database *Database) LoginAsAnonymous() (*User, error) {
 	return user, nil
 }
 
-func (database *Database) Register(username string, password string, usertype int64) (error) {
+func (database *Database) Register(username string, password string, usertype int64) (*User, error) {
 	_, err := database.stmt.insertUser.Exec(username, password, usertype, 0)
 	if err != nil {
-		return err
+		return nil, err
 	}
-	return nil
+	return database.Login(username, password)
+}
+
+func (database *Database) GetUserById(id int64) (*User, error) {
+	user := &User{}
+
+	// get user from database
+	err := database.stmt.getUserById.QueryRow(id).Scan(&user.ID, &user.Username, &user.Role, &user.AvatarId)
+	if err != nil {
+		return user, err
+	}
+	return user, nil
 }

pkg/database/sql_stmt.go

@@ -165,6 +165,8 @@ var countAdminQuery = `SELECT count(*) FROM users WHERE role= 1;`
 
 var getUserQuery = `SELECT id, username, role, avatar_id FROM users WHERE username = ? AND password = ? LIMIT 1;`
 
+var getUserByIdQuery = `SELECT id, username, role, avatar_id FROM users WHERE id = ? LIMIT 1;`
+
 var getAnonymousUserQuery = `SELECT id, username, role, avatar_id FROM users WHERE role = 0 LIMIT 1;`
 
 type Stmt struct {
@@ -197,6 +199,7 @@ type Stmt struct {
 	countUser          *sql.Stmt
 	countAdmin         *sql.Stmt
 	getUser            *sql.Stmt
+	getUserById        *sql.Stmt
 	getAnonymousUser   *sql.Stmt
 }
 
@@ -429,6 +432,12 @@ func NewPreparedStatement(sqlConn *sql.DB) (*Stmt, error) {
 		return nil, err
 	}
 
+	// init getUserById
+	stmt.getUserById, err = sqlConn.Prepare(getUserByIdQuery)
+	if err != nil {
+		return nil, err
+	}
+
 	// init getAnonymousUser
 	stmt.getAnonymousUser, err = sqlConn.Prepare(getAnonymousUserQuery)
 	if err != nil {