add option for user to disable MFA (#6)

internal/app/routes.go

@@ -12,6 +12,7 @@ func addWebRoutes(f *fiber.App) {
 	f.Get("/admin/account/", web.HandleAdminAccountGet)
 	f.Get("/admin/account/mfasetup", web.HandleAdminAccountMFASetupGet)
 	f.Post("/admin/account/mfasetup", web.HandleAdminAccountMFASetupPost)
+	f.Delete("/admin/account/mfa", web.HandleAdminAccountMFARemove)
 
 	f.Get("/admin/login", web.HandleAdminLoginGet)
 	f.Post("/admin/login", web.HandleAdminLoginPost)

internal/db/multifactor.go

@@ -3,10 +3,14 @@ package db
 import (
 	"context"
 	"fmt"
+	"log"
 
 	"code.lila.network/adoralaura/go-urlsh/models"
 )
 
+// UserHasMFA checks the DB if given models.User has MFA enabled.
+// Returns (true, nil) if User has MFA enabled, (false, nil) if not.
+// (false, error) if a DB error happened
 func UserHasMFA(user models.User) (bool, error) {
 	numrows, err := models.DB.NewSelect().Model((*models.MFAConfig)(nil)).Where("username = ?", user.UserName).Where("active = ?", true).Count(context.Background())
 	if err != nil {
@@ -33,3 +37,30 @@ func ScratchCodeIsUnique(scratchcode string) bool {
 	}
 	return true
 }
+
+// RemoveMFAFromDB removes MFA entries for given models.User from the database.
+// Returns nil on success, error otherwise.
+func RemoveMFAFromDB(user models.User) error {
+	hasMfa, err := UserHasMFA(user)
+	if err != nil {
+		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA from DB for user %v: %w", user.UserName, err)
+	}
+
+	if !hasMfa {
+		return nil
+	}
+
+	_, err = models.DB.NewDelete().Model((*models.MFAConfig)(nil)).Where("username = ?", user.UserName).Exec(context.Background())
+	if err != nil {
+		log.Println(err.Error())
+		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA Config from DB for user %v: %w", user.UserName, err)
+	}
+
+	_, err = models.DB.NewDelete().Model((*models.MFAScratchCode)(nil)).Where("username = ?", user.UserName).Exec(context.Background())
+	if err != nil {
+		log.Println(err.Error())
+		return fmt.Errorf("[RemoveMFAFromDB] Error removing MFA scratch codes from DB for user %v: %w", user.UserName, err)
+	}
+
+	return nil
+}

internal/web/multifactor-remove.go

@@ -0,0 +1,49 @@
+package web
+
+import (
+	"log"
+	"net/http"
+
+	"code.lila.network/adoralaura/go-urlsh/internal/constants"
+	"code.lila.network/adoralaura/go-urlsh/internal/db"
+	"code.lila.network/adoralaura/go-urlsh/internal/misc"
+	"github.com/gofiber/fiber/v2"
+)
+
+// HandleAdminAccountMFARemove is a DELETE endpoint that handles the deletion
+// of the logged in users MFA configuration.
+//
+// Returns HTTP 401 if no valid user cookie, HTTP 400 if no MFA is configured for the user,
+// HTTP 500 if a DB error happened or HTTP 204 if the deletion request succeeded.
+func HandleAdminAccountMFARemove(c *fiber.Ctx) error {
+
+	if !db.IsCookieValid(c.Cookies(constants.LoginCookieName, "")) {
+		c.Status(http.StatusUnauthorized)
+		return nil
+	}
+
+	user, err := db.GetUserFromCookie(c.Cookies(constants.LoginCookieName))
+	if err != nil {
+		log.Println(err)
+		return fiber.NewError(fiber.StatusInternalServerError, "500 Internal Server Error")
+	}
+
+	hasMfa, err := db.UserHasMFA(user)
+	if err != nil {
+		log.Println(err)
+		return fiber.NewError(fiber.StatusInternalServerError, "500 Internal Server Error")
+	}
+
+	if !hasMfa {
+		return misc.New400Error()
+	}
+
+	err = db.RemoveMFAFromDB(user)
+	if err != nil {
+		log.Println(err)
+		return fiber.NewError(fiber.StatusInternalServerError, "500 Internal Server Error")
+	}
+
+	c.Status(fiber.StatusNoContent)
+	return nil
+}

views/account.tmpl

@@ -11,9 +11,15 @@
   <link rel="stylesheet" href="/admin/custom.css">
   <script src="/admin/main.js" defer></script>
   <style>
-    h1, h2, h3, h4, h5, h6 {
-        margin-bottom: 30px;
+    h1,
+    h2,
+    h3,
+    h4,
+    h5,
+    h6 {
+      margin-bottom: 30px;
     }
+
     a[role=button] {
       width: fit-content;
     }
@@ -36,7 +42,7 @@
         <a href="/admin/apikeys/">API Keys</a>
       </li>
       <li>
-        <a href="javascript: void(0)" >Users (coming soon)</a>
+        <a href="javascript: void(0)">Users (coming soon)</a>
       </li>
       <li>
         <a href="javascript: Logout()" style="color: red;">Logout</a>
@@ -52,16 +58,22 @@
 
     <h2>Security</h2>
     {{if .MFAEnabled}}
-      <a role="button" class="secondary">2fa already enabled</a>
+    <a href="#" onclick="HandleMFARemovalRequest()" role="button">disable Two-Factor Authentication</a>
     {{else}}
-      <a href="/admin/account/mfasetup" role="button">Setup 2fa</a>
-      {{end}}
-    <dialog id="dialog-info">
-      <h2 id="dialog-heading"></h2>
-      <p id="dialog-text"></p>
-      <form method="dialog">
-        <button>Close</button>
-      </form>
+    <a href="/admin/account/mfasetup" role="button">Setup Two-Factor Authentication</a>
+    {{end}}
+    <dialog id="mfa-disable-dialog" style="flex-direction: column;">
+      <h2 id="dialog-heading">⚠️ Are you sure you want to disable two-factor authentication?</h2>
+      <p id="dialog-text">Two-factor authentication adds an additional layer of security to your account by requiring
+        more than just a password to sign in.<br />If you need to change your configuration, you can delete and re-add
+        Two-Factor authentication again.<br /><br />Do you really want to remove your Two-Factor authentication?</p>
+      <div class="container grid">
+
+        <!-- change those two buttons and rework the functions to close and initiate deletion-->
+        <button id="button-keep" class="pico-background-green-450" onclick="HandleModalClose('mfa-disable-dialog')">No, keep Two-Factor authentication</button>
+        <button id="button-delete" class="pico-color-red-450 pico-background-red-450" onclick="HandleMFARemoval()">Yes,
+          remove Two-Factor authentication</button>
+      </div>
     </dialog>
   </main>
   {{template "partials/footer" .}}

views/setup-multifactor.tmpl

@@ -72,19 +72,19 @@
         <input type="submit" value="Submit" class="contrast" style="width: fit-content;">
       </div>
     </form>
-    <dialog id="dialog-success" style="flex-direction: column;">
+    <dialog id="user-dialog" style="flex-direction: column;">
       <h2 id="dialog-heading">2FA successfully set up!</h2>
       <p id="dialog-text">These are your recovery codes, keep them somewhere safe, you'll only see them once:</p>
       <p id="dialog-tokens" class="monospace"></p>
       <form method="dialog">
-        <button onclick="HandleModalClose('/admin/account')">Close</button>
+        <button onclick="HandleModalClose('user-dialog', '/admin/account')">Close</button>
       </form>
     </dialog>
     <dialog id="dialog-error" style="flex-direction: column;">
       <h2 id="dialog-heading"></h2>
       <p id="dialog-text"></p>
       <form method="dialog">
-        <button onclick="HandleModalClose()">Close</button>
+        <button onclick="HandleModalClose('dialog-error')">Close</button>
       </form>
     </dialog>
   </main>

web/add_link.html

@@ -9,7 +9,6 @@
   <link rel="stylesheet" href="/admin/pico.min.css">
   <link rel="stylesheet" href="/admin/pico.colors.min.css">
   <link rel="stylesheet" href="/admin/custom.css">
-  <script src="/admin/link_add.js" defer></script>
   <script src="/admin/misc.js" defer></script>
 
 </head>

web/main.js

@@ -145,6 +145,39 @@ async function HandleMFASetupTokenSubmit() {
     }
 }
 
+async function HandleMFARemovalRequest() {
+    document.getElementById('mfa-disable-dialog').showModal()
+}
+
+async function HandleMFARemoval() {
+    let keepButton = document.getElementById('button-keep')
+    let deleteButton = document.getElementById('button-delete')
+
+    keepButton.disabled = true
+    deleteButton.disabled = true
+    deleteButton.value = 'Please wait...'
+    deleteButton.setAttribute('aria-busy', 'true')
+
+    endpoint = "/admin/account/mfa"
+    let response = await fetch(endpoint, {
+        credentials: "include",
+        mode: "same-origin",
+        method: "DELETE"
+    });
+
+    if (response.ok) {
+        document.location = "/admin/account"
+    } //else {
+        // TODO
+        // Handle error condition
+        //document.cookie = 'gourlsh_mfa_setup=; Max-Age=-1; path=/; domain=' + location.hostname;
+
+        //document.getElementById("dialog-heading").textContent = "Error!"
+        //document.getElementById("dialog-text").textContent = "Something didnt work!"
+        //document.getElementById('dialog-error').showModal()
+    //}
+}
+
 async function HandleMFALoginTokenPost() {
     document.getElementById("submit").disabled = true;
     document.getElementById("token").disabled = true;
@@ -174,9 +207,8 @@ async function HandleMFALoginTokenPost() {
     }
 }
 
-function HandleModalClose(redir) {
-    document.getElementById('dialog-success').close();
-    document.getElementById('dialog-error').close();
+function HandleModalClose(id, redir) {
+    document.getElementById(id).close();
 
     if (redir) {
         document.location = redir