Fill login form on failed sign in

server/template/html/login.html

@@ -10,10 +10,10 @@
         {{ end }}
 
         <label for="form-username">{{ t "Username" }}</label>
-        <input type="text" name="username" id="form-username" required autofocus>
+        <input type="text" name="username" id="form-username" value="{{ .form.Username }}" required autofocus>
 
         <label for="form-password">{{ t "Password" }}</label>
-        <input type="password" name="password" id="form-password" required>
+        <input type="password" name="password" id="form-password" value="{{ .form.Password }}" required>
 
         <div class="buttons">
             <button type="submit" class="button button-primary" data-label-loading="{{ t "Loading..." }}">{{ t "Sign in" }}</button>

server/template/views.go

 // Code generated by go generate; DO NOT EDIT.
-// 2017-12-22 11:25:01.96909666 -0800 PST m=+0.034064422
+// 2017-12-22 16:02:42.156291192 -0800 PST m=+0.011241908
 
 package template
 
@@ -974,10 +974,10 @@ var templateViewsMap = map[string]string{
         {{ end }}
 
         <label for="form-username">{{ t "Username" }}</label>
-        <input type="text" name="username" id="form-username" required autofocus>
+        <input type="text" name="username" id="form-username" value="{{ .form.Username }}" required autofocus>
 
         <label for="form-password">{{ t "Password" }}</label>
-        <input type="password" name="password" id="form-password" required>
+        <input type="password" name="password" id="form-password" value="{{ .form.Password }}" required>
 
         <div class="buttons">
             <button type="submit" class="button button-primary" data-label-loading="{{ t "Loading..." }}">{{ t "Sign in" }}</button>
@@ -1336,7 +1336,7 @@ var templateViewsMapChecksums = map[string]string{
 	"history":             "abc7ea29f7d54f28f73fe14979bbd03dbc41fa6a7c86f95f56d6e94f7b09b9ba",
 	"import":              "73b5112e20bfd232bf73334544186ea419505936bc237d481517a8622901878f",
 	"integrations":        "3c14d7de904911aad7f3ebec6d1a20b50843287f58125c526e167f429f3d455d",
-	"login":               "04f3ce79bfa5753f69e0d956c2a8999c0da549c7925634a3e8134975da0b0e0f",
+	"login":               "7d83c3067c02f1f6aafdd8816c7f97a4eb5a5a4bdaaaa4cc1e2fbb9c17ea65e8",
 	"sessions":            "878dbe8f8ea783b44130c495814179519fa5c3aa2666ac87508f94d58dd008bf",
 	"settings":            "ea2505b9d0a6d6bb594dba87a92079de19baa6d494f0651693a7685489fb7de9",
 	"starred":             "33dd40d1a24739e9d05f9cc4b66497cfdb8c86a7abb209a66ca65c2fbafc7d87",

server/ui/controller/login.go

@@ -31,6 +31,7 @@ func (c *Controller) CheckLogin(ctx *core.Context, request *core.Request, respon
 	tplParams := tplParams{
 		"errorMessage": "Invalid username or password.",
 		"csrf":         ctx.CSRF(),
+		"form":         authForm,
 	}
 
 	if err := authForm.Validate(); err != nil {

storage/user.go

@@ -338,7 +338,7 @@ func (s *Storage) CheckPassword(username, password string) error {
 	}
 
 	if err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password)); err != nil {
-		return fmt.Errorf("invalid password for %s", username)
+		return fmt.Errorf(`invalid password for "%s" (%v)`, username, err)
 	}
 
 	return nil