feat(auth): add user access filtering rules

cmd/server/container.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/wader/gormstore"
 
+	"forge.cadoles.com/Cadoles/guesstimate/internal/auth"
 	"forge.cadoles.com/Cadoles/guesstimate/internal/orm"
 
 	"gitlab.com/wpetit/goweb/logger"
@@ -96,5 +97,7 @@ func getServiceContainer(ctx context.Context, conf *config.Config) (*service.Con
 		oidc.WithScopes("email", "openid"),
 	))
 
+	ctn.Provide(auth.ServiceName, auth.ServiceProvider(conf.Auth.Rules))
+
 	return ctn, nil
 }

go.mod

@@ -5,6 +5,7 @@ go 1.14
 require (
 	forge.cadoles.com/wpetit/goweb-oidc v0.0.0-20200619080035-4bbf7b016032
 	github.com/99designs/gqlgen v0.11.3
+	github.com/antonmedv/expr v1.8.8
 	github.com/caarlos0/env/v6 v6.2.2
 	github.com/cortesi/modd v0.0.0-20200630120222-8983974e5450 // indirect
 	github.com/davecgh/go-spew v1.1.1

go.sum

@@ -20,6 +20,7 @@ github.com/99designs/gqlgen v0.11.3 h1:oFSxl1DFS9X///uHV3y6CEfpcXWrDUxVblR4Xib2b
 github.com/99designs/gqlgen v0.11.3/go.mod h1:RgX5GRRdDWNkh4pBrdzNpNPFVsdoUFY2+adM6nb1N+4=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/DATA-DOG/go-sqlmock v1.3.3/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
 github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
 github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
 github.com/PuerkitoBio/goquery v1.5.1/go.mod h1:GsLWisAFVj4WgDibEWF4pvYnkVQBpKBKeU+7zCJoLcc=
@@ -44,6 +45,8 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d h1:UQZhZ2O0vMHr2c
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
 github.com/andybalholm/cascadia v1.1.0/go.mod h1:GsXiBklL0woXo1j/WYWtSYYC4ouU9PqHO0sqidkEA4Y=
+github.com/antonmedv/expr v1.8.8 h1:uVwIkIBNO2yn4vY2u2DQUqXTmv9jEEMCEcHa19G5weY=
+github.com/antonmedv/expr v1.8.8/go.mod h1:5qsM3oLGDND7sDmQGDXHkYfkjYMUX14qsgqmHhwGEk8=
 github.com/arbovm/levenshtein v0.0.0-20160628152529-48b4e1c0c4d0/go.mod h1:t2tdKJDJF9BV14lnkjHmOQgcvEKgtqs5a1N3LNdJhGE=
 github.com/bmatcuk/doublestar v1.3.0/go.mod h1:wiQtGV+rzVYxB7WIlirSN++5HPtPlXEo9MEoZQC/PmE=
 github.com/bmatcuk/doublestar v1.3.1 h1:rT8rxDPsavp9G+4ZULzqhhUSaI/OPsTZNG88Z3i0xvY=
@@ -71,6 +74,7 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
 github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CLnGVd57E=
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 h1:y5HC9v93H5EPKqaS1UYVg1uYah5Xf51mBfIoWehClUQ=
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964/go.mod h1:Xd9hchkHSWYkEqJwUGisez3G1QY8Ryz0sdWrLPMGjLk=
+github.com/davecgh/go-spew v0.0.0-20161028175848-04cdfd42973b/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -90,6 +94,8 @@ github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
+github.com/gdamore/encoding v1.0.0/go.mod h1:alR0ol34c49FCSBLjhosxzcPHQbf2trDkoo5dl+VrEg=
+github.com/gdamore/tcell v1.3.0/go.mod h1:Hjvr+Ofd+gLglo7RYKxxnzCBmev3BzsS67MebKS4zMM=
 github.com/go-chi/chi v3.3.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
 github.com/go-chi/chi v4.0.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
 github.com/go-chi/chi v4.1.0+incompatible h1:ETj3cggsVIY2Xao5ExCu6YhEh5MD6JTfcBzS37R260w=
@@ -230,6 +236,8 @@ github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=
 github.com/lib/pq v1.3.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
 github.com/logrusorgru/aurora v0.0.0-20200102142835-e9ef32dff381/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
+github.com/lucasb-eyer/go-colorful v1.0.2/go.mod h1:0MS4r+7BZKSJ5mw4/S5MPN+qHFF1fYclkSPilDOKW0s=
+github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/matryer/moq v0.0.0-20200106131100-75d0ddfc0007 h1:reVOUXwnhsYv/8UqjvhrMOu5CNT9UapHFLbQ2JcXsmg=
 github.com/matryer/moq v0.0.0-20200106131100-75d0ddfc0007/go.mod h1:9ELz6aaclSIGnZBoaSLZ3NAl1VTufbOrXBPvtcy6WiQ=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
@@ -250,6 +258,8 @@ github.com/mattn/go-isatty v0.0.11 h1:FxPOTFNqGkuDUGi3H/qkUbQO4ZiBa2brKq5r0l8TGe
 github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mattn/go-runewidth v0.0.8/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-sqlite3 v1.14.0 h1:mLyGNKR8+Vv9CAU7PphKa2hkEqxxhn8i32J6FPj1/QA=
 github.com/mattn/go-sqlite3 v1.14.0/go.mod h1:JIl7NbARA7phWnGvh0LKTyg7S9BA+6gx71ShQilpsus=
 github.com/mattn/go-sqlite3 v2.0.1+incompatible/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
@@ -267,11 +277,14 @@ github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pmezard/go-difflib v0.0.0-20151028094244-d8ed2627bdf0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 h1:J9b7z+QKAmPf4YLrFg6oQUotqHQeUNWwkvo7jZp1GLU=
 github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35/go.mod h1:prYjPmNq4d1NPVmpShWobRqXY3q7Vp+80DqgxxUrUIA=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/rivo/tview v0.0.0-20200219210816-cd38d7432498/go.mod h1:6lkG1x+13OShEf0EaOCaTQYyB7d5nSbb181KtjlS+84=
+github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rjeczalik/notify v0.0.0-20181126183243-629144ba06a1 h1:FLWDC+iIP9BWgYKvWKKtOUZux35LIQNAuIzp/63RQJU=
 github.com/rjeczalik/notify v0.0.0-20181126183243-629144ba06a1/go.mod h1:aErll2f0sUX9PXZnVNyeiObbmTlk5jnMoCa4QEjJeqM=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
@@ -283,6 +296,7 @@ github.com/rs/zerolog v1.13.0/go.mod h1:YbFCdg8HfsridGWAh22vktObvhZbQsZXe4/zB0OK
 github.com/rs/zerolog v1.15.0/go.mod h1:xYTKnLHcpfU2225ny5qZjxnj9NvkumZYjJHlAThCjNc=
 github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/sanity-io/litter v1.2.0/go.mod h1:JF6pZUFgu2Q0sBZ+HSV35P8TVPI1TTzEwyu9FXAw2W4=
 github.com/satori/go.uuid v1.2.0/go.mod h1:dA0hQrYB0VpLJoorglMZABFdXlWrHn1NEOzdhQKdks0=
 github.com/sergi/go-diff v1.0.0 h1:Kpca3qRNrduNnOQeazBd0ysaKrUJiIuISHxogkT9RPQ=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
@@ -299,6 +313,7 @@ github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6Mwd
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v0.0.0-20161117074351-18a02ba4a312/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.2.1/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
@@ -410,6 +425,7 @@ golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190626150813-e07cf5db2756/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190804053845-51ab0e2deafa/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190826190057-c7b8b68b1456/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -418,6 +434,7 @@ golang.org/x/sys v0.0.0-20191210023423-ac6580df4449 h1:gSbV7h1NRL2G1xTg/owz62CST
 golang.org/x/sys v0.0.0-20191210023423-ac6580df4449/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42 h1:vEOn+mP2zCOVzKckCZy6YsCtDblrpj/w7B9nxGNELpg=
 golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae h1:/WDfKMnPU+m5M4xB+6x4kaepxRw6jWvR5iDRdvjHgy8=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

internal/auth/auth.go

@@ -0,0 +1,71 @@
+package auth
+
+import (
+	"sync"
+
+	"forge.cadoles.com/Cadoles/guesstimate/internal/model"
+	"github.com/antonmedv/expr"
+	"github.com/antonmedv/expr/vm"
+	"github.com/pkg/errors"
+)
+
+var (
+	ErrUnexpectedRuleResult = errors.New("unexpected rule result")
+)
+
+type Service struct {
+	rules []*vm.Program
+	mutex sync.RWMutex
+}
+
+func (s *Service) LoadRules(rawRules ...string) error {
+	rules := make([]*vm.Program, 0, len(rawRules))
+
+	for _, rr := range rawRules {
+		r, err := expr.Compile(rr)
+		if err != nil {
+			return errors.WithStack(err)
+		}
+
+		rules = append(rules, r)
+	}
+
+	s.mutex.Lock()
+	s.rules = rules
+	s.mutex.Unlock()
+
+	return nil
+}
+
+func (s *Service) Authorize(user *model.User) (bool, error) {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	env := map[string]interface{}{
+		"user": user,
+	}
+
+	for _, r := range s.rules {
+		result, err := expr.Run(r, env)
+		if err != nil {
+			return false, errors.WithStack(err)
+		}
+
+		authorized, ok := result.(bool)
+		if !ok {
+			return false, errors.WithStack(ErrUnexpectedRuleResult)
+		}
+
+		if !authorized {
+			return false, nil
+		}
+	}
+
+	return true, nil
+}
+
+func NewService() *Service {
+	return &Service{
+		rules: make([]*vm.Program, 0),
+	}
+}

internal/auth/provider.go

@@ -0,0 +1,20 @@
+package auth
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+func ServiceProvider(rules []string) service.Provider {
+	srv := NewService()
+
+	err := srv.LoadRules(rules...)
+
+	return func(ctn *service.Container) (interface{}, error) {
+		if err != nil {
+			return nil, errors.WithStack(err)
+		}
+
+		return srv, nil
+	}
+}

internal/auth/service.go

@@ -0,0 +1,33 @@
+package auth
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/wpetit/goweb/service"
+)
+
+const ServiceName service.Name = "auth"
+
+// From retrieves the auth service in the given container.
+func From(container *service.Container) (*Service, error) {
+	service, err := container.Service(ServiceName)
+	if err != nil {
+		return nil, errors.Wrapf(err, "error while retrieving '%s' service", ServiceName)
+	}
+
+	srv, ok := service.(*Service)
+	if !ok {
+		return nil, errors.Errorf("retrieved service is not a valid '%s' service", ServiceName)
+	}
+
+	return srv, nil
+}
+
+// Must retrieves the auth service in the given container or panic otherwise.
+func Must(container *service.Container) *Service {
+	srv, err := From(container)
+	if err != nil {
+		panic(err)
+	}
+
+	return srv
+}

internal/config/config.go

@@ -18,6 +18,7 @@ type Config struct {
 	HTTP     HTTPConfig     `yaml:"http"`
 	OIDC     OIDCConfig     `yaml:"oidc"`
 	Database DatabaseConfig `yaml:"database"`
+	Auth     AuthConfig     `yaml:"auth"`
 }
 
 // NewFromFile retrieves the configuration from the given file
@@ -69,6 +70,10 @@ type DatabaseConfig struct {
 	DSN string `yaml:"dsn" env:"DATABASE_DSN"`
 }
 
+type AuthConfig struct {
+	Rules []string `yaml:"rules" env:"AUTH_RULES"`
+}
+
 func NewDumpDefault() *Config {
 	config := NewDefault()
 	return config
@@ -102,6 +107,9 @@ func NewDefault() *Config {
 		Database: DatabaseConfig{
 			DSN: "host=localhost database=guesstimate",
 		},
+		Auth: AuthConfig{
+			Rules: []string{},
+		},
 	}
 }
 

internal/route/login.go

@@ -1,8 +1,11 @@
 package route
 
 import (
+	"fmt"
 	"net/http"
 
+	"forge.cadoles.com/Cadoles/guesstimate/internal/auth"
+
 	"forge.cadoles.com/Cadoles/guesstimate/internal/model"
 	"forge.cadoles.com/Cadoles/guesstimate/internal/orm"
 
@@ -31,6 +34,7 @@ func handleLoginCallback(w http.ResponseWriter, r *http.Request) {
 	ctx := r.Context()
 	ctn := container.Must(ctx)
 	conf := config.Must(ctn)
+	auth := auth.Must(ctn)
 
 	idToken, err := oidc.IDToken(w, r)
 	if err != nil {
@@ -65,10 +69,26 @@ func handleLoginCallback(w http.ResponseWriter, r *http.Request) {
 	db := orm.Must(ctn).DB()
 	repo := model.NewUserRepository(db)
 
-	if _, err := repo.CreateOrConnectUser(ctx, claims.Email); err != nil {
+	user, err := repo.CreateOrConnectUser(ctx, claims.Email)
+	if err != nil {
 		panic(errors.Wrap(err, "could not upsert user"))
 	}
 
+	authorized, err := auth.Authorize(user)
+	if err != nil {
+		panic(errors.WithStack(err))
+	}
+
+	if !authorized {
+		message := fmt.Sprintf(
+			"You are not authorized to access this application. Disconnect by navigating to %s.",
+			"http://"+r.Host+"/logout",
+		)
+		http.Error(w, message, http.StatusForbidden)
+
+		return
+	}
+
 	if err := session.SaveUserEmail(w, r, claims.Email); err != nil {
 		panic(errors.WithStack(err))
 	}