Various quick fixes

* Signup: if entering an existing email, don't admit that the email
  exists. Instead, send a specialized email to its address.
* Search: no longer search for users by email address.
* Login: always hash the incoming password on user not found, to take
  constant time compared to when the user did exist.
* Fix a pagination bug when a private (shy account) views a non-friend's
  photo gallery.

pkg/controller/account/login.go

@@ -10,6 +10,7 @@ import (
 	"code.nonshy.com/nonshy/website/pkg/ratelimit"
 	"code.nonshy.com/nonshy/website/pkg/session"
 	"code.nonshy.com/nonshy/website/pkg/templates"
+	"golang.org/x/crypto/bcrypt"
 )
 
 // Login controller.
@@ -29,6 +30,11 @@ func Login() http.HandlerFunc {
 			// Look up their account.
 			user, err := models.FindUser(username)
 			if err != nil {
+				// The user wasn't found, but still hash the incoming password to take time:
+				// so a mischievous user can't infer whether the username was valid based
+				// on the server response time.
+				bcrypt.GenerateFromPassword([]byte(password), config.BcryptCost)
+
 				session.FlashError(w, r, "Incorrect username or password.")
 				templates.Redirect(w, r.URL.Path)
 				return

pkg/controller/account/search.go

@@ -26,7 +26,7 @@ func Search() http.HandlerFunc {
 		// Search filters.
 		var (
 			isCertified   = r.FormValue("certified")
-			username      = r.FormValue("username") // email or username
+			username      = r.FormValue("username") // username search
 			gender        = r.FormValue("gender")
 			orientation   = r.FormValue("orientation")
 			maritalStatus = r.FormValue("marital_status")
@@ -73,7 +73,7 @@ func Search() http.HandlerFunc {
 		pager.ParsePage(r)
 
 		users, err := models.SearchUsers(currentUser, &models.UserSearch{
-			EmailOrUsername: username,
+			Username:      username,
 			Gender:        gender,
 			Orientation:   orientation,
 			MaritalStatus: maritalStatus,

pkg/controller/account/signup.go

@@ -126,7 +126,22 @@ func Signup() http.HandlerFunc {
 
 			// Already an account?
 			if _, err := models.FindUser(email); err == nil {
-				session.FlashError(w, r, "There is already an account with that e-mail address.")
+				// We don't want to admit that the email already is registered, so send an email to the
+				// address in case the user legitimately forgot, but flash the regular success message.
+				err := mail.Send(mail.Message{
+					To:       email,
+					Subject:  "You already have a nonshy account",
+					Template: "email/already_signed_up.html",
+					Data: map[string]interface{}{
+						"Title": config.Title,
+						"URL":   config.Current.BaseURL + "/forgot-password",
+					},
+				})
+				if err != nil {
+					session.FlashError(w, r, "Error sending an email: %s", err)
+				}
+
+				session.Flash(w, r, "We have sent an e-mail to %s with a link to continue signing up your account. Please go and check your e-mail.", email)
 				templates.Redirect(w, r.URL.Path)
 				return
 			}

pkg/controller/photo/user_gallery.go

@@ -61,7 +61,7 @@ func UserPhotos() http.HandlerFunc {
 				"User":       user,
 				"Photos":     []*models.Photo{},
 				"PhotoCount": models.CountPhotos(user.ID),
-				"Pager":      models.Pagination{},
+				"Pager":      &models.Pagination{},
 			}
 
 			if err := tmpl.Execute(w, r, vars); err != nil {

pkg/models/user.go

@@ -184,7 +184,7 @@ func (u *User) IsShyFrom(other *User) bool {
 
 // UserSearch config.
 type UserSearch struct {
-	EmailOrUsername string
+	Username      string
 	Gender        string
 	Orientation   string
 	MaritalStatus string
@@ -213,10 +213,10 @@ func SearchUsers(user *User, search *UserSearch, pager *Pagination) ([]*User, er
 		placeholders = append(placeholders, blockedUserIDs)
 	}
 
-	if search.EmailOrUsername != "" {
+	if search.Username != "" {
-		ilike := "%" + strings.TrimSpace(strings.ToLower(search.EmailOrUsername)) + "%"
+		ilike := "%" + strings.TrimSpace(strings.ToLower(search.Username)) + "%"
-		wheres = append(wheres, "(email LIKE ? OR username LIKE ?)")
+		wheres = append(wheres, "username LIKE ?")
-		placeholders = append(placeholders, ilike, ilike)
+		placeholders = append(placeholders, ilike)
 	}
 
 	if search.Gender != "" {

web/templates/account/search.html

@@ -57,7 +57,7 @@
 
                         <div class="column">
                             <div class="field">
-                                <label class="label">Email or username:</label>
+                                <label class="label">Partial username:</label>
                                 <input type="text" class="input"
                                     name="username"
                                     autocomplete="off"

web/templates/email/already_signed_up.html

@@ -0,0 +1,35 @@
+{{define "content"}}
+<html>
+    <body bakground="#ffffff" color="#000000" link="#0000FF" vlink="#990099" alink="#FF0000">
+        <basefont face="Arial,Helvetica,sans-serif" size="3" color="#000000"></basefont>
+
+        <h1>You already have a {{.Data.Title}} account</h1>
+
+        <p>
+            Somebody (hopefully you) has tried to sign up a new account by entering your e-mail address.
+            We already have an account for this e-mail address, but we didn't admit that to whoever
+            just signed up.
+        </p>
+
+        <p>
+            If it was not you, then you can disregard this e-mail.
+        </p>
+
+        <p>
+            If you have forgotten your password, you can request a password reset at the link below:
+        </p>
+
+        <p>
+        <a href="{{.Data.URL}}" target="_blank">{{.Data.URL}}</a>
+        </p>
+
+        <p>
+            You may sign in to the website using your e-mail address and account password.
+        </p>
+
+        <p>
+            This is an automated e-mail; do not reply to this message.
+        </p>
+    </body>
+</html>
+{{end}}

web/templates/partials/simple_pager.html

@@ -10,6 +10,7 @@ added. Should be suitable for most pagers that don't need any specialized logic.
 See also: template_funcs.go for the SimplePager wrapper function.
 -->
 {{define "SimplePager"}}
+    {{if .Pager.Pages}}
     <nav class="pagination" role="navigation" aria-label="pagination">
         <a class="pagination-previous{{if not .Pager.HasPrevious}} is-disabled{{end}}" title="Previous"
             href="{{.Request.URL.Path}}?{{QueryPlus "page" .Pager.Previous}}">Previous</a>
@@ -28,4 +29,5 @@ See also: template_funcs.go for the SimplePager wrapper function.
             {{end}}
         </ul>
     </nav>
+    {{end}}
 {{end}}