From f49b42f70f902d4da1e0fa4080e99164b331b716 Mon Sep 17 00:00:00 2001
From: Frédéric Guillot <fred@miniflux.net>
Date: Sun, 29 Apr 2018 16:35:04 -0700
Subject: Use vanilla HTTP handlers (refactoring)

---
 ui/oauth2_callback.go | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 ui/oauth2_callback.go

(limited to 'ui/oauth2_callback.go')

diff --git a/ui/oauth2_callback.go b/ui/oauth2_callback.go
new file mode 100644
index 0000000..f564c7e
--- /dev/null
+++ b/ui/oauth2_callback.go
@@ -0,0 +1,128 @@
+// Copyright 2017 Frédéric Guillot. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package ui
+
+import (
+	"net/http"
+
+	"github.com/miniflux/miniflux/http/context"
+	"github.com/miniflux/miniflux/http/cookie"
+	"github.com/miniflux/miniflux/http/request"
+	"github.com/miniflux/miniflux/http/response"
+	"github.com/miniflux/miniflux/http/response/html"
+	"github.com/miniflux/miniflux/http/route"
+	"github.com/miniflux/miniflux/logger"
+	"github.com/miniflux/miniflux/model"
+	"github.com/miniflux/miniflux/ui/session"
+
+	"github.com/tomasen/realip"
+)
+
+// OAuth2Callback receives the authorization code and create a new session.
+func (c *Controller) OAuth2Callback(w http.ResponseWriter, r *http.Request) {
+	ctx := context.New(r)
+	sess := session.New(c.store, ctx)
+
+	provider := request.Param(r, "provider", "")
+	if provider == "" {
+		logger.Error("[OAuth2] Invalid or missing provider")
+		response.Redirect(w, r, route.Path(c.router, "login"))
+		return
+	}
+
+	code := request.QueryParam(r, "code", "")
+	if code == "" {
+		logger.Error("[OAuth2] No code received on callback")
+		response.Redirect(w, r, route.Path(c.router, "login"))
+		return
+	}
+
+	state := request.QueryParam(r, "state", "")
+	if state == "" || state != ctx.OAuth2State() {
+		logger.Error(`[OAuth2] Invalid state value: got "%s" instead of "%s"`, state, ctx.OAuth2State())
+		response.Redirect(w, r, route.Path(c.router, "login"))
+		return
+	}
+
+	authProvider, err := getOAuth2Manager(c.cfg).Provider(provider)
+	if err != nil {
+		logger.Error("[OAuth2] %v", err)
+		response.Redirect(w, r, route.Path(c.router, "login"))
+		return
+	}
+
+	profile, err := authProvider.GetProfile(code)
+	if err != nil {
+		logger.Error("[OAuth2] %v", err)
+		response.Redirect(w, r, route.Path(c.router, "login"))
+		return
+	}
+
+	if ctx.IsAuthenticated() {
+		user, err := c.store.UserByExtraField(profile.Key, profile.ID)
+		if err != nil {
+			html.ServerError(w, err)
+			return
+		}
+
+		if user != nil {
+			logger.Error("[OAuth2] User #%d cannot be associated because %s is already associated", ctx.UserID(), user.Username)
+			sess.NewFlashErrorMessage(c.translator.GetLanguage(ctx.UserLanguage()).Get("There is already someone associated with this provider!"))
+			response.Redirect(w, r, route.Path(c.router, "settings"))
+			return
+		}
+
+		if err := c.store.UpdateExtraField(ctx.UserID(), profile.Key, profile.ID); err != nil {
+			html.ServerError(w, err)
+			return
+		}
+
+		sess.NewFlashMessage(c.translator.GetLanguage(ctx.UserLanguage()).Get("Your external account is now linked!"))
+		response.Redirect(w, r, route.Path(c.router, "settings"))
+		return
+	}
+
+	user, err := c.store.UserByExtraField(profile.Key, profile.ID)
+	if err != nil {
+		html.ServerError(w, err)
+		return
+	}
+
+	if user == nil {
+		if !c.cfg.IsOAuth2UserCreationAllowed() {
+			html.Forbidden(w)
+			return
+		}
+
+		user = model.NewUser()
+		user.Username = profile.Username
+		user.IsAdmin = false
+		user.Extra[profile.Key] = profile.ID
+
+		if err := c.store.CreateUser(user); err != nil {
+			html.ServerError(w, err)
+			return
+		}
+	}
+
+	sessionToken, _, err := c.store.CreateUserSession(user.Username, r.UserAgent(), realip.RealIP(r))
+	if err != nil {
+		html.ServerError(w, err)
+		return
+	}
+
+	logger.Info("[Controller:OAuth2Callback] username=%s just logged in", user.Username)
+	c.store.SetLastLogin(user.ID)
+	sess.SetLanguage(user.Language)
+
+	http.SetCookie(w, cookie.New(
+		cookie.CookieUserSessionID,
+		sessionToken,
+		c.cfg.IsHTTPS,
+		c.cfg.BasePath(),
+	))
+
+	response.Redirect(w, r, route.Path(c.router, "unread"))
+}
-- 
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