feat(auth): change password user self service #171

handler.go

@@ -33,11 +33,13 @@ func getHandler(db *sql.DB) http.Handler {
 	router.Handle("/auth/verify", service.HandleSignUpVerifyPage(db)) // Hint for the user to verify their email
 	router.Handle("/auth/delete-account", service.HandleDeleteAccountPage(db))
 	router.Handle("/auth/verify-email", service.HandleSignUpVerifyResponsePage(db)) // The link contained in the email
+	router.Handle("/auth/change-password", service.HandleChangePasswordPage(db))
 	router.Handle("/api/auth/signup", service.HandleSignUpComp(db))
 	router.Handle("/api/auth/signin", service.HandleSignInComp(db))
 	router.Handle("/api/auth/signout", service.HandleSignOutComp(db))
 	router.Handle("/api/auth/delete-account", service.HandleDeleteAccountComp(db))
 	router.Handle("/api/auth/verify-resend", service.HandleVerifyResendComp(db))
+	router.Handle("/api/auth/change-password", service.HandleChangePasswordComp(db))
 
 	return middleware.Logging(middleware.EnableCors(router))
 }

service/auth.go

@@ -6,6 +6,7 @@ import (
 	"crypto/subtle"
 	"database/sql"
 	"encoding/base64"
+	"errors"
 	"net/http"
 	"net/mail"
 	"strings"
@@ -87,7 +88,7 @@ func HandleSignUpVerifyPage(db *sql.DB) http.HandlerFunc {
 
 func HandleDeleteAccountPage(db *sql.DB) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		// An enverified email should be able to delete their account
+		// An unverified email should be able to delete their account
 		user := utils.GetUserFromSession(db, r)
 		if user == nil {
 			utils.DoRedirect(w, r, "/auth/signin")
@@ -96,7 +97,7 @@ func HandleDeleteAccountPage(db *sql.DB) http.HandlerFunc {
 			comp := auth.DeleteAccountComp()
 			err := template.Layout(comp, userComp).Render(r.Context(), w)
 			if err != nil {
-				utils.LogError("Failed to render verify page", err)
+				utils.LogError("Failed to render delete account page", err)
 				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
 			}
 		}
@@ -145,6 +146,24 @@ func HandleSignUpVerifyResponsePage(db *sql.DB) http.HandlerFunc {
 	}
 }
 
+func HandleChangePasswordPage(db *sql.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+
+		user := utils.GetUserFromSession(db, r)
+		if user == nil {
+			utils.DoRedirect(w, r, "/auth/signin")
+		} else {
+			userComp := UserInfoComp(user)
+			comp := auth.ChangePasswordComp()
+			err := template.Layout(comp, userComp).Render(r.Context(), w)
+			if err != nil {
+				utils.LogError("Failed to render change password page", err)
+				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+			}
+		}
+	}
+}
+
 func UserInfoComp(user *types.User) templ.Component {
 
 	if user != nil {
@@ -165,12 +184,9 @@ func HandleSignUpComp(db *sql.DB) http.HandlerFunc {
 			return
 		}
 
-		if len(password) < 8 ||
-			!strings.ContainsAny(password, "0123456789") ||
-			!strings.ContainsAny(password, "ABCDEFGHIJKLMNOPQRSTUVWXYZ") ||
-			!strings.ContainsAny(password, "abcdefghijklmnopqrstuvwxyz") ||
-			!strings.ContainsAny(password, "!@#$%^&*()_+-=[]{}\\|;:'\",.<>/?") {
-			http.Error(w, "Password needs to be 8 characters long, contain at least one number, one special, one uppercase and one lowercase character", http.StatusBadRequest)
+		err = checkPassword(password)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
 			return
 		}
 
@@ -360,6 +376,59 @@ func HandleVerifyResendComp(db *sql.DB) http.HandlerFunc {
 	}
 }
 
+func HandleChangePasswordComp(db *sql.DB) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		user := utils.GetUserFromSession(db, r)
+		if user == nil {
+			utils.DoRedirect(w, r, "/auth/signin")
+			return
+		}
+
+		currPass := r.FormValue("current-password")
+		newPass := r.FormValue("new-password")
+
+		err := checkPassword(newPass)
+		if err != nil {
+			utils.TriggerToast(w, r, "error", err.Error())
+			return
+		}
+
+		if currPass == newPass {
+			utils.TriggerToast(w, r, "error", "Please use a new password")
+			return
+		}
+
+		var (
+			storedHash []byte
+			salt       []byte
+		)
+
+		err = db.QueryRow("SELECT password, salt FROM user WHERE user_uuid = ?", user.Id).Scan(&storedHash, &salt)
+		if err != nil {
+			utils.LogError("Could not get password", err)
+			utils.TriggerToast(w, r, "error", "Internal Server Error")
+			return
+		}
+
+		currHash := getHashPassword(currPass, salt)
+		if subtle.ConstantTimeCompare(currHash, storedHash) == 0 {
+			utils.TriggerToast(w, r, "error", "Current Password is not correct")
+			return
+		}
+
+		newHash := getHashPassword(newPass, salt)
+
+		_, err = db.Exec("UPDATE user SET password = ? WHERE user_uuid = ?", newHash, user.Id)
+		if err != nil {
+			utils.LogError("Could not update password", err)
+			utils.TriggerToast(w, r, "error", "Internal Server Error")
+			return
+		}
+
+		utils.TriggerToast(w, r, "success", "Password changed")
+	}
+}
+
 func sendVerificationEmail(db *sql.DB, userId string, email string) {
 
 	var token string
@@ -434,3 +503,16 @@ func tryCreateSessionAndSetCookie(r *http.Request, w http.ResponseWriter, db *sq
 func getHashPassword(password string, salt []byte) []byte {
 	return argon2.IDKey([]byte(password), salt, 1, 64*1024, 1, 16)
 }
+
+func checkPassword(password string) error {
+
+	if len(password) < 8 ||
+		!strings.ContainsAny(password, "0123456789") ||
+		!strings.ContainsAny(password, "ABCDEFGHIJKLMNOPQRSTUVWXYZ") ||
+		!strings.ContainsAny(password, "abcdefghijklmnopqrstuvwxyz") ||
+		!strings.ContainsAny(password, "!@#$%^&*()_+-=[]{}\\|;:'\",.<>/?") {
+		return errors.New("Password needs to be 8 characters long, contain at least one number, one special, one uppercase and one lowercase character")
+	} else {
+		return nil
+	}
+}

template/auth/change_password.templ

@@ -0,0 +1,22 @@
+package auth
+
+templ ChangePasswordComp() {
+	<form
+		class="max-w-xl px-2 mx-auto flex flex-col gap-4 h-full justify-center"
+		hx-post="/api/auth/change-password"
+		hx-swap="none"
+	>
+		<h2 class="text-6xl mb-10">
+			Change Password
+		</h2>
+		<label class="input input-bordered flex items-center gap-2">
+			<input type="password" class="grow" placeholder="Current Password" name="current-password"/>
+		</label>
+		<label class="input input-bordered flex items-center gap-2">
+			<input type="password" class="grow" placeholder="New Password" name="new-password"/>
+		</label>
+		<button class="btn btn-primary self-end">
+			Change Password
+		</button>
+	</form>
+}

template/auth/user.templ

@@ -23,6 +23,9 @@ templ UserComp(user string) {
 						<li class="mb-1">
 							<a hx-get="/api/auth/signout" hx-target="#user-info">Sign Out</a>
 						</li>
+						<li class="mb-1">
+							<a href="/auth/change-password">Change Password</a>
+						</li>
 						<li><a href="/auth/delete-account" class="text-error">Delete Account</a></li>
 					</ul>
 				</div>