Add Keep email private (see issue #571). (#571)

- Add site-wide option DEFAULT_KEEP_EMAIL_PRIVATE.
- Add the new option to the install and admin/config pages.
- Add the new option to app.ini in the service section.
- Add the new option to the settings struct.
- Add English text strings to i18n.
- Add field KeepEmailPrivate to user struct.
- Add field KeepEmailPrivate to user form.
- Add option to UI.
- Add using noreply email address if user has "Keep Email Private".
An email address <LowerName>@<NO_REPLY_ADDRESS> is now used in commit
messages (and hopefully all other git log relevant places). The
change relies on the fact that git commands should use
user.NetGitSig().
- Add hiding of email address in UI, if user has set "Keep Email Private".
- Add condition to show email address only on explore/users and user
pages, if user has not set "Keep Email Private".
- Add noreply email in API if set "Keep Email Private".
- Add a new service setting NO_REPLY_ADDRESS. The value of this
setting is used as the domain part for the user's email address in
git log, iff he decides to keep his email address private.
If the user decides to keep his email address private and this
option is not set 'noreply.example.org' is used, which no MTA
should send email to.

Add NO_REPLY_ADDRESS to conf/app.ini.

models/user.go

@@ -75,19 +75,20 @@ type User struct {
 	Name      string `xorm:"UNIQUE NOT NULL"`
 	FullName  string
 	// Email is the primary email address (to be used for communication)
-	Email       string `xorm:"NOT NULL"`
-	Passwd      string `xorm:"NOT NULL"`
-	LoginType   LoginType
-	LoginSource int64 `xorm:"NOT NULL DEFAULT 0"`
-	LoginName   string
-	Type        UserType
-	OwnedOrgs   []*User       `xorm:"-"`
-	Orgs        []*User       `xorm:"-"`
-	Repos       []*Repository `xorm:"-"`
-	Location    string
-	Website     string
-	Rands       string `xorm:"VARCHAR(10)"`
-	Salt        string `xorm:"VARCHAR(10)"`
+	Email            string `xorm:"NOT NULL"`
+	KeepEmailPrivate bool
+	Passwd           string `xorm:"NOT NULL"`
+	LoginType        LoginType
+	LoginSource      int64 `xorm:"NOT NULL DEFAULT 0"`
+	LoginName        string
+	Type             UserType
+	OwnedOrgs        []*User       `xorm:"-"`
+	Orgs             []*User       `xorm:"-"`
+	Repos            []*Repository `xorm:"-"`
+	Location         string
+	Website          string
+	Rands            string `xorm:"VARCHAR(10)"`
+	Salt             string `xorm:"VARCHAR(10)"`
 
 	Created       time.Time `xorm:"-"`
 	CreatedUnix   int64     `xorm:"INDEX"`
@@ -170,13 +171,22 @@ func (u *User) AfterSet(colName string, _ xorm.Cell) {
 	}
 }
 
+// getEmail returns an noreply email, if the user has set to keep his
+// email address private, otherwise the primary email address.
+func (u *User) getEmail() string {
+	if u.KeepEmailPrivate {
+		return fmt.Sprintf("%s@%s", u.LowerName, setting.Service.NoReplyAddress)
+	}
+	return u.Email
+}
+
 // APIFormat converts a User to api.User
 func (u *User) APIFormat() *api.User {
 	return &api.User{
 		ID:        u.ID,
 		UserName:  u.Name,
 		FullName:  u.FullName,
-		Email:     u.Email,
+		Email:     u.getEmail(),
 		AvatarURL: u.AvatarLink(),
 	}
 }
@@ -361,7 +371,7 @@ func (u *User) GetFollowing(page int) ([]*User, error) {
 func (u *User) NewGitSig() *git.Signature {
 	return &git.Signature{
 		Name:  u.DisplayName(),
-		Email: u.Email,
+		Email: u.getEmail(),
 		When:  time.Now(),
 	}
 }
@@ -616,6 +626,8 @@ func CreateUser(u *User) (err error) {
 		return ErrEmailAlreadyUsed{u.Email}
 	}
 
+	u.KeepEmailPrivate = setting.Service.DefaultKeepEmailPrivate
+
 	u.LowerName = strings.ToLower(u.Name)
 	u.AvatarEmail = u.Email
 	u.Avatar = base.HashEmail(u.AvatarEmail)