implement OIDC login flow

.gitignore

@@ -32,3 +32,6 @@ test.db.old
 .gitignore
 .nvim/session
 *templ.txt
+
+# env files
+.env*

cmd/web/handlers_user.go

@@ -9,6 +9,7 @@ import (
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
 	"git.32bit.cafe/32bitcafe/guestbook/internal/validator"
 	"git.32bit.cafe/32bitcafe/guestbook/ui/views"
+	"github.com/coreos/go-oidc/v3/oidc"
 )
 
 func (app *application) getUserRegister(w http.ResponseWriter, r *http.Request) {
@@ -92,6 +93,88 @@ func (app *application) postUserLogin(w http.ResponseWriter, r *http.Request) {
 	http.Redirect(w, r, "/", http.StatusSeeOther)
 }
 
+func (app *application) userLoginOIDC(w http.ResponseWriter, r *http.Request) {
+	state, err := randString(16)
+	if err != nil {
+		app.serverError(w, r, err)
+		return
+	}
+	nonce, err := randString(16)
+	if err != nil {
+		app.serverError(w, r, err)
+		return
+	}
+
+	setCallbackCookie(w, r, "state", state)
+	setCallbackCookie(w, r, "nonce", nonce)
+
+	http.Redirect(w, r, app.oauth.config.AuthCodeURL(state, oidc.Nonce(nonce)), http.StatusFound)
+}
+
+func (app *application) userLoginOIDCCallback(w http.ResponseWriter, r *http.Request) {
+	state, err := r.Cookie("state")
+	if err != nil {
+		app.clientError(w, http.StatusBadRequest)
+		return
+	}
+	if r.URL.Query().Get("state") != state.Value {
+		app.clientError(w, http.StatusBadRequest)
+		return
+	}
+
+	oauth2Token, err := app.oauth.config.Exchange(r.Context(), r.URL.Query().Get("code"))
+	if err != nil {
+		app.logger.Error("Failed to exchange token")
+		app.serverError(w, r, err)
+		return
+	}
+	rawIDToken, ok := oauth2Token.Extra("id_token").(string)
+	if !ok {
+		app.serverError(w, r, errors.New("No id_token field in oauth2 token"))
+		return
+	}
+	idToken, err := app.oauth.verifier.Verify(r.Context(), rawIDToken)
+	if err != nil {
+		app.logger.Error("Failed to verify ID token")
+		app.serverError(w, r, err)
+		return
+	}
+
+	nonce, err := r.Cookie("nonce")
+	if err != nil {
+		app.logger.Error("nonce not found")
+		app.serverError(w, r, err)
+		return
+	}
+	if idToken.Nonce != nonce.Value {
+		app.serverError(w, r, errors.New("nonce did not match"))
+		return
+	}
+
+	oauth2Token.AccessToken = "*REDACTED*"
+
+	var t models.UserIdToken
+	if err := idToken.Claims(&t); err != nil {
+		app.serverError(w, r, err)
+		return
+	}
+
+	err = app.sessionManager.RenewToken(r.Context())
+	if err != nil {
+		app.serverError(w, r, err)
+		return
+	}
+	id, err := app.users.AuthenticateByOIDC(t.Email, t.Subject)
+	if err != nil {
+		id, err = app.users.InsertWithoutPassword(app.createShortId(), t.Username, t.Email, t.Subject, DefaultUserSettings())
+		if err != nil {
+			app.serverError(w, r, err)
+		}
+	}
+	app.sessionManager.Put(r.Context(), "authenticatedUserId", id)
+	http.Redirect(w, r, "/", http.StatusSeeOther)
+}
+
 func (app *application) postUserLogout(w http.ResponseWriter, r *http.Request) {
 	err := app.sessionManager.RenewToken(r.Context())
 	if err != nil {

cmd/web/helpers.go

@@ -1,8 +1,11 @@
 package main
 
 import (
+	"crypto/rand"
+	"encoding/base64"
 	"errors"
 	"fmt"
+	"io"
 	"math"
 	"net/http"
 	"net/url"
@@ -140,3 +143,22 @@ func matchOrigin(origin string, u *url.URL) bool {
 	}
 	return true
 }
+
+func randString(nByte int) (string, error) {
+	b := make([]byte, nByte)
+	if _, err := io.ReadFull(rand.Reader, b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+func setCallbackCookie(w http.ResponseWriter, r *http.Request, name, value string) {
+	c := &http.Cookie{
+		Name:     name,
+		Value:    value,
+		MaxAge:   int(time.Hour.Seconds()),
+		Secure:   r.TLS != nil,
+		HttpOnly: true,
+	}
+	http.SetCookie(w, c)
+}

cmd/web/main.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"context"
 	"crypto/tls"
 	"database/sql"
+	"errors"
 	"flag"
+	"fmt"
 	"log/slog"
 	"net/http"
 	"os"
@@ -14,10 +17,21 @@ import (
 	"git.32bit.cafe/32bitcafe/guestbook/internal/models"
 	"github.com/alexedwards/scs/sqlite3store"
 	"github.com/alexedwards/scs/v2"
+	"github.com/coreos/go-oidc/v3/oidc"
 	"github.com/gorilla/schema"
+	"github.com/joho/godotenv"
 	_ "github.com/mattn/go-sqlite3"
+	"golang.org/x/oauth2"
 )
 
+type applicationOauthConfig struct {
+	ctx        context.Context
+	config     oauth2.Config
+	provider   *oidc.Provider
+	oidcConfig *oidc.Config
+	verifier   *oidc.IDTokenVerifier
+}
+
 type application struct {
 	sequence          uint16
 	logger            *slog.Logger
@@ -26,6 +40,7 @@ type application struct {
 	guestbookComments models.GuestbookCommentModelInterface
 	sessionManager    *scs.SessionManager
 	formDecoder       *schema.Decoder
+	oauth             applicationOauthConfig
 	debug             bool
 	timezones         []string
 	rootUrl           string
@@ -35,10 +50,11 @@ func main() {
 	addr := flag.String("addr", ":3000", "HTTP network address")
 	dsn := flag.String("dsn", "guestbook.db", "data source name")
 	debug := flag.Bool("debug", false, "enable debug mode")
-	root := flag.String("root", "localhost:3000", "root URL of application")
+	root := flag.String("root", "https://localhost:3000", "root URL of application")
 	flag.Parse()
 
 	logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: slog.LevelDebug}))
+	godotenv.Load(".env.dev")
 
 	db, err := openDB(*dsn)
 	if err != nil {
@@ -67,6 +83,13 @@ func main() {
 		rootUrl:           *root,
 	}
 
+	o, err := setupOauth(app.rootUrl)
+	if err != nil {
+		logger.Error(err.Error())
+		os.Exit(1)
+	}
+	app.oauth = o
+
 	err = app.users.InitializeSettingsMap()
 	if err != nil {
 		logger.Error(err.Error())
@@ -114,6 +137,38 @@ func openDB(dsn string) (*sql.DB, error) {
 	return db, nil
 }
 
+func setupOauth(rootUrl string) (applicationOauthConfig, error) {
+	var c applicationOauthConfig
+	var (
+		oauth2Provider = os.Getenv("OAUTH2_PROVIDER")
+		clientID       = os.Getenv("OAUTH2_CLIENT_ID")
+		clientSecret   = os.Getenv("OAUTH2_CLIENT_SECRET")
+	)
+	if oauth2Provider == "" || clientID == "" || clientSecret == "" {
+		return applicationOauthConfig{}, errors.New("OAUTH2_PROVIDER, OAUTH2_CLIENT_ID, and OAUTH2_CLIENT_SECRET must be specified as environment variables.")
+	}
+
+	c.ctx = context.Background()
+	provider, err := oidc.NewProvider(c.ctx, oauth2Provider)
+	if err != nil {
+		return applicationOauthConfig{}, err
+	}
+	c.provider = provider
+	c.oidcConfig = &oidc.Config{
+		ClientID: clientID,
+	}
+	c.verifier = provider.Verifier(c.oidcConfig)
+	c.config = oauth2.Config{
+		ClientID:     clientID,
+		ClientSecret: clientSecret,
+		Endpoint:     provider.Endpoint(),
+		RedirectURL:  fmt.Sprintf("%s/users/login/oidc/callback", rootUrl),
+		Scopes:       []string{oidc.ScopeOpenID, "profile", "email"},
+	}
+	return c, nil
+
+}
+
 func getAvailableTimezones() []string {
 	var zones []string
 	var zoneDirs = []string{

cmd/web/routes.go

@@ -27,6 +27,8 @@ func (app *application) routes() http.Handler {
 	mux.Handle("POST /users/register", dynamic.ThenFunc(app.postUserRegister))
 	mux.Handle("GET /users/login", dynamic.ThenFunc(app.getUserLogin))
 	mux.Handle("POST /users/login", dynamic.ThenFunc(app.postUserLogin))
+	mux.Handle("/users/login/oidc", dynamic.ThenFunc(app.userLoginOIDC))
+	mux.Handle("/users/login/oidc/callback", dynamic.ThenFunc(app.userLoginOIDCCallback))
 	mux.Handle("GET /help", dynamic.ThenFunc(app.notImplemented))
 
 	protected := dynamic.Append(app.requireAuthentication)

go.mod

@@ -6,9 +6,14 @@ require (
 	github.com/a-h/templ v0.3.833
 	github.com/alexedwards/scs/sqlite3store v0.0.0-20250212122300-421ef1d8611c
 	github.com/alexedwards/scs/v2 v2.8.0
+	github.com/coreos/go-oidc/v3 v3.14.1
 	github.com/gorilla/schema v1.4.1
+	github.com/joho/godotenv v1.5.1
 	github.com/justinas/alice v1.2.0
 	github.com/justinas/nosurf v1.1.1
 	github.com/mattn/go-sqlite3 v1.14.24
 	golang.org/x/crypto v0.36.0
+	golang.org/x/oauth2 v0.30.0
 )
+
+require github.com/go-jose/go-jose/v4 v4.0.5 // indirect

go.sum

@@ -1,24 +1,35 @@
 github.com/a-h/templ v0.3.833 h1:L/KOk/0VvVTBegtE0fp2RJQiBm7/52Zxv5fqlEHiQUU=
 github.com/a-h/templ v0.3.833/go.mod h1:cAu4AiZhtJfBjMY0HASlyzvkrtjnHWPeEsyGK2YYmfk=
-github.com/alexedwards/scs/sqlite3store v0.0.0-20240316134038-7e11d57e8885 h1:+DCxWg/ojncqS+TGAuRUoV7OfG/S4doh0pcpAwEcow0=
-github.com/alexedwards/scs/sqlite3store v0.0.0-20240316134038-7e11d57e8885/go.mod h1:Iyk7S76cxGaiEX/mSYmTZzYehp4KfyylcLaV3OnToss=
 github.com/alexedwards/scs/sqlite3store v0.0.0-20250212122300-421ef1d8611c h1:0gBCIsmH3+aaWK55APhhY7/Z+uv5IdbMqekI97V9shU=
 github.com/alexedwards/scs/sqlite3store v0.0.0-20250212122300-421ef1d8611c/go.mod h1:Iyk7S76cxGaiEX/mSYmTZzYehp4KfyylcLaV3OnToss=
 github.com/alexedwards/scs/v2 v2.8.0 h1:h31yUYoycPuL0zt14c0gd+oqxfRwIj6SOjHdKRZxhEw=
 github.com/alexedwards/scs/v2 v2.8.0/go.mod h1:ToaROZxyKukJKT/xLcVQAChi5k6+Pn1Gvmdl7h3RRj8=
+github.com/coreos/go-oidc/v3 v3.14.1 h1:9ePWwfdwC4QKRlCXsJGou56adA/owXczOzwKdOumLqk=
+github.com/coreos/go-oidc/v3 v3.14.1/go.mod h1:HaZ3szPaZ0e4r6ebqvsLWlk2Tn+aejfmrfah6hnSYEU=
+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=
+github.com/go-jose/go-jose/v4 v4.0.5 h1:M6T8+mKZl/+fNNuFHvGIzDz7BTLQPIounk/b9dw3AaE=
+github.com/go-jose/go-jose/v4 v4.0.5/go.mod h1:s3P1lRrkT8igV8D9OjyL4WRyHvjB6a4JSllnOrmmBOA=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/gorilla/schema v1.4.1 h1:jUg5hUjCSDZpNGLuXQOgIWGdlgrIdYvgQ0wZtdK1M3E=
 github.com/gorilla/schema v1.4.1/go.mod h1:Dg5SSm5PV60mhF2NFaTV1xuYYj8tV8NOPRo4FggUMnM=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/justinas/alice v1.2.0 h1:+MHSA/vccVCF4Uq37S42jwlkvI2Xzl7zTPCN5BnZNVo=
 github.com/justinas/alice v1.2.0/go.mod h1:fN5HRH/reO/zrUflLfTN43t3vXvKzvZIENsNEe7i7qA=
 github.com/justinas/nosurf v1.1.1 h1:92Aw44hjSK4MxJeMSyDa7jwuI9GR2J/JCQiaKvXXSlk=
 github.com/justinas/nosurf v1.1.1/go.mod h1:ALpWdSbuNGy2lZWtyXdjkYv4edL23oSEgfBT1gPJ5BQ=
-github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/go-sqlite3 v1.14.24 h1:tpSp2G2KyMnnQu99ngJ47EIkWVmliIizyZBfPrBWDRM=
 github.com/mattn/go-sqlite3 v1.14.24/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-golang.org/x/crypto v0.29.0 h1:L5SG1JTTXupVV3n6sUqMTeWbjAyfPwoda2DLX8J8FrQ=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-golang.org/x/crypto v0.29.0/go.mod h1:+F4F4N5hv6v38hfeYwTdx20oUvLLc+QfrE9Ax9HtgRg=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/crypto v0.36.0 h1:AnAEvhDddvBdpY+uR+MyHmuZzzNqXSe/GvuDeob5L34=
 golang.org/x/crypto v0.36.0/go.mod h1:Y4J0ReaxCR1IMaabaSMugxJES1EpwhBHhv2bDHklZvc=
+golang.org/x/oauth2 v0.30.0 h1:dnDm7JmhM45NNpd8FDDeLhK6FwqbOf4MLCM9zb1BOHI=
+golang.org/x/oauth2 v0.30.0/go.mod h1:B++QgG3ZKulg6sRPGD/mqlHQs5rB3Ml9erfeDY7xKlU=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/models/mocks/users.go

@@ -38,6 +38,15 @@ func (m *UserModel) Insert(shortId uint64, username string, email string, passwo
 	}
 }
 
+func (m *UserModel) InsertWithoutPassword(shortId uint64, username string, email string, password string, settings models.UserSettings) (int64, error) {
+	switch email {
+	case "dupe@example.com":
+		return -1, models.ErrDuplicateEmail
+	default:
+		return 2, nil
+	}
+}
+
 func (m *UserModel) Get(shortId uint64) (models.User, error) {
 	switch shortId {
 	case 1:
@@ -67,6 +76,13 @@ func (m *UserModel) Authenticate(email, password string) (int64, error) {
 	return 0, models.ErrInvalidCredentials
 }
 
+func (m *UserModel) AuthenticateByOIDC(email, subject string) (int64, error) {
+	if email == "test@example.com" {
+		return 1, nil
+	}
+	return 0, models.ErrInvalidCredentials
+}
+
 func (m *UserModel) Exists(id int64) (bool, error) {
 	switch id {
 	case 1:

internal/models/user.go

@@ -35,13 +35,23 @@ type UserModel struct {
 	Settings map[string]Setting
 }
 
+type UserIdToken struct {
+	Subject       string   `json:"sub"`
+	Email         string   `json:"email"`
+	EmailVerified bool     `json:"email_verified"`
+	Username      string   `json:"preferred_username"`
+	Groups        []string `json:"groups"`
+}
+
 type UserModelInterface interface {
 	InitializeSettingsMap() error
 	Insert(shortId uint64, username string, email string, password string, settings UserSettings) error
+	InsertWithoutPassword(shortId uint64, username string, email string, subject string, settings UserSettings) (int64, error)
 	Get(shortId uint64) (User, error)
 	GetById(id int64) (User, error)
 	GetAll() ([]User, error)
 	Authenticate(email, password string) (int64, error)
+	AuthenticateByOIDC(email, subject string) (int64, error)
 	Exists(id int64) (bool, error)
 	UpdateUserSettings(userId int64, settings UserSettings) error
 	UpdateSetting(userId int64, setting Setting, value string) error
@@ -126,6 +136,49 @@ func (m *UserModel) Insert(shortId uint64, username string, email string, passwo
 	return nil
 }
 
+func (m *UserModel) InsertWithoutPassword(shortId uint64, username string, email string, subject string, settings UserSettings) (int64, error) {
+	stmt := `INSERT INTO users (ShortId, Username, Email, IsBanned, OIDCSubject, Created)
+    VALUES (?, ?, ?, FALSE, ?, ?)`
+	tx, err := m.DB.Begin()
+	if err != nil {
+		return -1, err
+	}
+	result, err := tx.Exec(stmt, shortId, username, email, subject, time.Now().UTC())
+	if err != nil {
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			return -1, err
+		}
+		if sqliteError, ok := err.(sqlite3.Error); ok {
+			if sqliteError.ExtendedCode == 2067 && strings.Contains(sqliteError.Error(), "Email") {
+				return -1, ErrDuplicateEmail
+			}
+		}
+		return -1, err
+	}
+	id, err := result.LastInsertId()
+	if err != nil {
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			return -1, err
+		}
+		return -1, err
+	}
+	stmt = `INSERT INTO user_settings (UserId, SettingId, AllowedSettingValueId, UnconstrainedValue) 
+		VALUES (?, ?, ?, ?)`
+	_, err = tx.Exec(stmt, id, m.Settings[SettingUserTimezone].id, nil, settings.LocalTimezone.String())
+	if err != nil {
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			return -1, err
+		}
+		return -1, err
+	}
+	err = tx.Commit()
+	if err != nil {
+		return -1, err
+	}
+
+	return id, nil
+}
+
 func (m *UserModel) Get(shortId uint64) (User, error) {
 	stmt := `SELECT Id, ShortId, Username, Email, Created FROM users WHERE ShortId = ? AND Deleted IS NULL`
 	tx, err := m.DB.Begin()
@@ -239,6 +292,51 @@ func (m *UserModel) Authenticate(email, password string) (int64, error) {
 	return id, nil
 }
 
+func (m *UserModel) AuthenticateByOIDC(email string, subject string) (int64, error) {
+	var id int64
+	var s sql.NullString
+	tx, err := m.DB.Begin()
+	if err != nil {
+		return -1, err
+	}
+	stmt := `SELECT Id, OIDCSubject FROM users WHERE Email = ?`
+	err = tx.QueryRow(stmt, email, subject).Scan(&id, &s)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			if rollbackErr := tx.Rollback(); rollbackErr != nil {
+				return -1, err
+			}
+			return -1, ErrNoRecord
+		} else {
+			if rollbackErr := tx.Rollback(); rollbackErr != nil {
+				return -1, err
+			}
+			return -1, err
+		}
+	}
+
+	if !s.Valid {
+		stmt = `UPDATE users SET OIDCSubject = ? WHERE Id = ?`
+		_, err = tx.Exec(stmt, subject, id)
+		if err != nil {
+			if rollbackErr := tx.Rollback(); rollbackErr != nil {
+				return -1, err
+			}
+			return -1, err
+		}
+	} else if subject != s.String {
+		if rollbackErr := tx.Rollback(); rollbackErr != nil {
+			return -1, ErrInvalidCredentials
+		}
+	}
+
+	err = tx.Commit()
+	if err != nil {
+		return -1, err
+	}
+	return id, nil
+}
+
 func (m *UserModel) Exists(id int64) (bool, error) {
 	var exists bool
 	stmt := `SELECT EXISTS(SELECT true FROM users WHERE Id = ? AND DELETED IS NULL)`

migrations/000006_change_password_field.down.sql

@@ -0,0 +1,4 @@
+ALTER TABLE users RENAME COLUMN HashedPassword TO HashedPasswordOld;
+ALTER TABLE users ADD COLUMN HashedPassword char(60) NOT NULL DEFAULT '0000';
+UPDATE users SET HashedPassword=HashedPasswordOld;
+ALTER TABLE users DROP COLUMN HashedPasswordOld;

migrations/000006_change_password_field.up.sql

@@ -0,0 +1,4 @@
+ALTER TABLE users RENAME COLUMN HashedPassword TO HashedPasswordOld;
+ALTER TABLE users ADD COLUMN HashedPassword char(60) NULL;
+UPDATE users SET HashedPassword=HashedPasswordOld;
+ALTER TABLE users DROP COLUMN HashedPasswordOld;

migrations/000007_add_oidc_subject.down.sql

@@ -0,0 +1 @@
+ALTER TABLE users DROP COLUMN OIDCSubject;

migrations/000007_add_oidc_subject.up.sql

@@ -0,0 +1 @@
+ALTER TABLE users ADD COLUMN OIDCSubject varchar(255);

ui/views/common.templ

@@ -12,6 +12,7 @@ type CommonData struct {
 	CSRFToken       string
 	CurrentUser     *models.User
 	IsHtmx          bool
+	RootUrl         string
 }
 
 func shortIdToSlug(shortId uint64) string {

ui/views/common_templ.go

@@ -102,7 +102,7 @@ func topNav(data CommonData) templ.Component {
 			var templ_7745c5c3_Var3 string
 			templ_7745c5c3_Var3, templ_7745c5c3_Err = templ.JoinStringErrs(data.CurrentUser.Username)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 44, Col: 40}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 45, Col: 40}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var3))
 			if templ_7745c5c3_Err != nil {
@@ -121,7 +121,7 @@ func topNav(data CommonData) templ.Component {
 			var templ_7745c5c3_Var4 string
 			templ_7745c5c3_Var4, templ_7745c5c3_Err = templ.JoinStringErrs(hxHeaders)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 52, Col: 62}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 53, Col: 62}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var4))
 			if templ_7745c5c3_Err != nil {
@@ -202,7 +202,7 @@ func base(title string, data CommonData) templ.Component {
 		var templ_7745c5c3_Var7 string
 		templ_7745c5c3_Var7, templ_7745c5c3_Err = templ.JoinStringErrs(title)
 		if templ_7745c5c3_Err != nil {
-			return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 71, Col: 17}
+			return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 72, Col: 17}
 		}
 		_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var7))
 		if templ_7745c5c3_Err != nil {
@@ -232,7 +232,7 @@ func base(title string, data CommonData) templ.Component {
 			var templ_7745c5c3_Var8 string
 			templ_7745c5c3_Var8, templ_7745c5c3_Err = templ.JoinStringErrs(data.Flash)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 83, Col: 36}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/common.templ`, Line: 84, Col: 36}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var8))
 			if templ_7745c5c3_Err != nil {

ui/views/users.templ

@@ -30,7 +30,8 @@ templ UserLogin(title string, data CommonData, form forms.UserLoginForm) {
 				<input type="password" name="password"/>
 			</div>
 			<div>
-				<input type="submit" value="login"/>
+				<input type="submit" value="Login"/>
+				<a href="/users/login/oidc">Login with SSO</a>
 			</div>
 		</form>
 	}

ui/views/users_templ.go

@@ -143,7 +143,7 @@ func UserLogin(title string, data CommonData, form forms.UserLoginForm) templ.Co
 					return templ_7745c5c3_Err
 				}
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "<input type=\"password\" name=\"password\"></div><div><input type=\"submit\" value=\"login\"></div></form>")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "<input type=\"password\" name=\"password\"></div><div><input type=\"submit\" value=\"Login\"> <a href=\"/users/login/oidc\">Login with SSO</a></div></form>")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
@@ -197,7 +197,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 			var templ_7745c5c3_Var10 string
 			templ_7745c5c3_Var10, templ_7745c5c3_Err = templ.JoinStringErrs(data.CSRFToken)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 43, Col: 64}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 44, Col: 64}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var10))
 			if templ_7745c5c3_Err != nil {
@@ -220,7 +220,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 				var templ_7745c5c3_Var11 string
 				templ_7745c5c3_Var11, templ_7745c5c3_Err = templ.JoinStringErrs(error)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 48, Col: 33}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 49, Col: 33}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var11))
 				if templ_7745c5c3_Err != nil {
@@ -238,7 +238,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 			var templ_7745c5c3_Var12 string
 			templ_7745c5c3_Var12, templ_7745c5c3_Err = templ.JoinStringErrs(form.Name)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 50, Col: 70}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 51, Col: 70}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var12))
 			if templ_7745c5c3_Err != nil {
@@ -261,7 +261,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 				var templ_7745c5c3_Var13 string
 				templ_7745c5c3_Var13, templ_7745c5c3_Err = templ.JoinStringErrs(error)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 56, Col: 33}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 57, Col: 33}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var13))
 				if templ_7745c5c3_Err != nil {
@@ -279,7 +279,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 			var templ_7745c5c3_Var14 string
 			templ_7745c5c3_Var14, templ_7745c5c3_Err = templ.JoinStringErrs(form.Email)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 58, Col: 65}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 59, Col: 65}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var14))
 			if templ_7745c5c3_Err != nil {
@@ -302,7 +302,7 @@ func UserRegistration(title string, data CommonData, form forms.UserRegistration
 				var templ_7745c5c3_Var15 string
 				templ_7745c5c3_Var15, templ_7745c5c3_Err = templ.JoinStringErrs(error)
 				if templ_7745c5c3_Err != nil {
-					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 64, Col: 33}
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 65, Col: 33}
 				}
 				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var15))
 				if templ_7745c5c3_Err != nil {
@@ -367,7 +367,7 @@ func UserProfile(title string, data CommonData, user models.User) templ.Componen
 			var templ_7745c5c3_Var18 string
 			templ_7745c5c3_Var18, templ_7745c5c3_Err = templ.JoinStringErrs(user.Username)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 77, Col: 21}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 78, Col: 21}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var18))
 			if templ_7745c5c3_Err != nil {
@@ -380,7 +380,7 @@ func UserProfile(title string, data CommonData, user models.User) templ.Componen
 			var templ_7745c5c3_Var19 string
 			templ_7745c5c3_Var19, templ_7745c5c3_Err = templ.JoinStringErrs(user.Email)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 78, Col: 17}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 79, Col: 17}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var19))
 			if templ_7745c5c3_Err != nil {
@@ -441,7 +441,7 @@ func UserSettingsView(data CommonData, timezones []string) templ.Component {
 			var templ_7745c5c3_Var22 string
 			templ_7745c5c3_Var22, templ_7745c5c3_Err = templ.JoinStringErrs(data.CSRFToken)
 			if templ_7745c5c3_Err != nil {
-				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 88, Col: 65}
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 89, Col: 65}
 			}
 			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var22))
 			if templ_7745c5c3_Err != nil {
@@ -460,7 +460,7 @@ func UserSettingsView(data CommonData, timezones []string) templ.Component {
 					var templ_7745c5c3_Var23 string
 					templ_7745c5c3_Var23, templ_7745c5c3_Err = templ.JoinStringErrs(tz)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 93, Col: 25}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 94, Col: 25}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var23))
 					if templ_7745c5c3_Err != nil {
@@ -473,7 +473,7 @@ func UserSettingsView(data CommonData, timezones []string) templ.Component {
 					var templ_7745c5c3_Var24 string
 					templ_7745c5c3_Var24, templ_7745c5c3_Err = templ.JoinStringErrs(tz)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 93, Col: 48}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 94, Col: 48}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var24))
 					if templ_7745c5c3_Err != nil {
@@ -491,7 +491,7 @@ func UserSettingsView(data CommonData, timezones []string) templ.Component {
 					var templ_7745c5c3_Var25 string
 					templ_7745c5c3_Var25, templ_7745c5c3_Err = templ.JoinStringErrs(tz)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 95, Col: 25}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 96, Col: 25}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var25))
 					if templ_7745c5c3_Err != nil {
@@ -504,7 +504,7 @@ func UserSettingsView(data CommonData, timezones []string) templ.Component {
 					var templ_7745c5c3_Var26 string
 					templ_7745c5c3_Var26, templ_7745c5c3_Err = templ.JoinStringErrs(tz)
 					if templ_7745c5c3_Err != nil {
-						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 95, Col: 32}
+						return templ.Error{Err: templ_7745c5c3_Err, FileName: `ui/views/users.templ`, Line: 96, Col: 32}
 					}
 					_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var26))
 					if templ_7745c5c3_Err != nil {