Splitted the user settings code into several files to be more maintainable (#3968)

* refactor setting router code

splitted up one huge router settings file into the smaller files
representing the actual page structure

* move code to subfolder

* rename functions

* renamed files

* add copyright information

routers/user/setting/security_twofa.go

@@ -0,0 +1,187 @@
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package setting
+
+import (
+	"bytes"
+	"encoding/base64"
+	"html/template"
+	"image/png"
+	"strings"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/auth"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/pquerna/otp"
+	"github.com/pquerna/otp/totp"
+)
+
+// RegenerateScratchTwoFactor regenerates the user's 2FA scratch code.
+func RegenerateScratchTwoFactor(ctx *context.Context) {
+	ctx.Data["Title"] = ctx.Tr("settings")
+	ctx.Data["PageIsSettingsSecurity"] = true
+
+	t, err := models.GetTwoFactorByUID(ctx.User.ID)
+	if err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if err = t.GenerateScratchToken(); err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if err = models.UpdateTwoFactor(t); err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr("settings.twofa_scratch_token_regenerated", t.ScratchToken))
+	ctx.Redirect(setting.AppSubURL + "/user/settings/security")
+}
+
+// DisableTwoFactor deletes the user's 2FA settings.
+func DisableTwoFactor(ctx *context.Context) {
+	ctx.Data["Title"] = ctx.Tr("settings")
+	ctx.Data["PageIsSettingsSecurity"] = true
+
+	t, err := models.GetTwoFactorByUID(ctx.User.ID)
+	if err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if err = models.DeleteTwoFactorByID(t.ID, ctx.User.ID); err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	ctx.Flash.Success(ctx.Tr("settings.twofa_disabled"))
+	ctx.Redirect(setting.AppSubURL + "/user/settings/security")
+}
+
+func twofaGenerateSecretAndQr(ctx *context.Context) bool {
+	var otpKey *otp.Key
+	var err error
+	uri := ctx.Session.Get("twofaUri")
+	if uri != nil {
+		otpKey, err = otp.NewKeyFromURL(uri.(string))
+	}
+	if otpKey == nil {
+		err = nil // clear the error, in case the URL was invalid
+		otpKey, err = totp.Generate(totp.GenerateOpts{
+			Issuer:      setting.AppName + " (" + strings.TrimRight(setting.AppURL, "/") + ")",
+			AccountName: ctx.User.Name,
+		})
+		if err != nil {
+			ctx.ServerError("SettingsTwoFactor", err)
+			return false
+		}
+	}
+
+	ctx.Data["TwofaSecret"] = otpKey.Secret()
+	img, err := otpKey.Image(320, 240)
+	if err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return false
+	}
+
+	var imgBytes bytes.Buffer
+	if err = png.Encode(&imgBytes, img); err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return false
+	}
+
+	ctx.Data["QrUri"] = template.URL("data:image/png;base64," + base64.StdEncoding.EncodeToString(imgBytes.Bytes()))
+	ctx.Session.Set("twofaSecret", otpKey.Secret())
+	ctx.Session.Set("twofaUri", otpKey.String())
+	return true
+}
+
+// EnrollTwoFactor shows the page where the user can enroll into 2FA.
+func EnrollTwoFactor(ctx *context.Context) {
+	ctx.Data["Title"] = ctx.Tr("settings")
+	ctx.Data["PageIsSettingsSecurity"] = true
+
+	t, err := models.GetTwoFactorByUID(ctx.User.ID)
+	if t != nil {
+		// already enrolled
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+	if err != nil && !models.IsErrTwoFactorNotEnrolled(err) {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if !twofaGenerateSecretAndQr(ctx) {
+		return
+	}
+
+	ctx.HTML(200, tplSettingsTwofaEnroll)
+}
+
+// EnrollTwoFactorPost handles enrolling the user into 2FA.
+func EnrollTwoFactorPost(ctx *context.Context, form auth.TwoFactorAuthForm) {
+	ctx.Data["Title"] = ctx.Tr("settings")
+	ctx.Data["PageIsSettingsSecurity"] = true
+
+	t, err := models.GetTwoFactorByUID(ctx.User.ID)
+	if t != nil {
+		// already enrolled
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+	if err != nil && !models.IsErrTwoFactorNotEnrolled(err) {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if ctx.HasError() {
+		if !twofaGenerateSecretAndQr(ctx) {
+			return
+		}
+		ctx.HTML(200, tplSettingsTwofaEnroll)
+		return
+	}
+
+	secret := ctx.Session.Get("twofaSecret").(string)
+	if !totp.Validate(form.Passcode, secret) {
+		if !twofaGenerateSecretAndQr(ctx) {
+			return
+		}
+		ctx.Flash.Error(ctx.Tr("settings.passcode_invalid"))
+		ctx.HTML(200, tplSettingsTwofaEnroll)
+		return
+	}
+
+	t = &models.TwoFactor{
+		UID: ctx.User.ID,
+	}
+	err = t.SetSecret(secret)
+	if err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+	err = t.GenerateScratchToken()
+	if err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	if err = models.NewTwoFactor(t); err != nil {
+		ctx.ServerError("SettingsTwoFactor", err)
+		return
+	}
+
+	ctx.Session.Delete("twofaSecret")
+	ctx.Session.Delete("twofaUri")
+	ctx.Flash.Success(ctx.Tr("settings.twofa_enrolled", t.ScratchToken))
+	ctx.Redirect(setting.AppSubURL + "/user/settings/security")
+}