actually do some OAuth

auth/auth.go

@@ -0,0 +1,72 @@
+package auth
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"net/http"
+
+	"astraltech.xyz/calendar/v2/webserver"
+	"golang.org/x/oauth2"
+)
+
+func generateState() (string, error) {
+	b := make([]byte, 32)
+	if _, err := rand.Read(b); err != nil {
+		return "", err
+	}
+	return base64.RawURLEncoding.EncodeToString(b), nil
+}
+
+func HandlePasswordAuth(authData webserver.PasswordAuthData) bool {
+	fmt.Printf("%s, %s\n", authData.Username, authData.Password)
+	return false
+}
+
+func HandleOAuth(authData webserver.OAuthAuthData) bool {
+	state, err := generateState()
+	if err != nil {
+		http.Error(*authData.ResponseWriter, "Failed to generate state", http.StatusInternalServerError)
+		return false
+	}
+	verifier := oauth2.GenerateVerifier()
+
+	http.SetCookie(*authData.ResponseWriter, &http.Cookie{
+		Name:     "oauth_state",
+		Value:    state,
+		Path:     "/",
+		MaxAge:   300,
+		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
+	})
+
+	http.SetCookie(*authData.ResponseWriter, &http.Cookie{
+		Name:     "pkce_verifier",
+		Value:    verifier,
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
+	})
+
+	url := OAuthConfigs[0].AuthCodeURL(
+		state,
+		oauth2.S256ChallengeOption(verifier),
+	)
+	http.Redirect(*authData.ResponseWriter, authData.Request, url, http.StatusFound)
+
+	return false
+}
+
+func HandleAuthRequest(authType webserver.AuthStyle, authData webserver.AuthData) bool {
+	if authType == webserver.AuthStylePassword {
+		passwordAuthData, _ := authData.(webserver.PasswordAuthData)
+		return HandlePasswordAuth(passwordAuthData)
+	}
+
+	if authType == webserver.AuthStyleOAuth {
+		passwordAuthData, _ := authData.(webserver.OAuthAuthData)
+		return HandleOAuth(passwordAuthData)
+	}
+
+	return false
+}

auth/oauth.go

@@ -0,0 +1,31 @@
+package auth
+
+import (
+	"context"
+
+	"github.com/coreos/go-oidc/v3/oidc"
+	"golang.org/x/oauth2"
+)
+
+var OAuthConfigs []oauth2.Config
+
+func CreateTestOAuth() {
+	ctx := context.Background()
+
+	provider, err := oidc.NewProvider(ctx, "https://account.astraltech.xyz/application/o/stalwart/")
+	if err != nil {
+		panic(err)
+	}
+
+	oauthConfig := oauth2.Config{
+		ClientID:    "stalwart-webui",
+		RedirectURL: "http://localhost:8080/callback",
+		Endpoint:    provider.Endpoint(),
+		Scopes: []string{
+			oidc.ScopeOpenID,
+			"profile",
+			"email",
+		},
+	}
+	OAuthConfigs = append(OAuthConfigs, oauthConfig)
+}

auth/oauth_callback.go

@@ -0,0 +1,11 @@
+package auth
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// this is usually served at /callback
+func OAuthCallback(w http.ResponseWriter, r *http.Request) {
+	fmt.Printf("Getting my OAuth callback")
+}

auth/token.go

@@ -0,0 +1,32 @@
+package auth
+
+import (
+	"encoding/json"
+	"os"
+
+	"golang.org/x/oauth2"
+)
+
+type TokenStore struct {
+	filePath string
+}
+
+func (ts *TokenStore) Save(token *oauth2.Token) error {
+	data, err := json.Marshal(token)
+	if err != nil {
+		return err
+	}
+	return os.WriteFile(ts.filePath, data, 0600)
+}
+
+func (ts *TokenStore) Load() (*oauth2.Token, error) {
+	data, err := os.ReadFile(ts.filePath)
+	if err != nil {
+		return nil, err
+	}
+	var token oauth2.Token
+	if err := json.Unmarshal(data, &token); err != nil {
+		return nil, err
+	}
+	return &token, nil
+}

caldav/dav_response.go

@@ -1,4 +1,4 @@
-package main
+package caldav
 
 type MultiStatus struct {
 	Responses []Response `xml:"response"`

caldav/dav_server.go

@@ -1,4 +1,4 @@
-package main
+package caldav
 
 import (
 	"encoding/xml"
@@ -21,9 +21,11 @@ const neededXML string = `
 	`
 
 var client *http.Client
+var serverURL string
 
-func init_dav_client() {
+func InitDavClient(url string) {
 	client = &http.Client{}
+	serverURL = url
 }
 
 type Event struct {
@@ -42,10 +44,10 @@ type SimpleCalDavData struct {
 }
 
 // this makes stalwart assumptions
-func get_caldav_data(username string, password string) SimpleCalDavData {
+func GetCalDAVData(username string, password string) SimpleCalDavData {
 	req, _ := http.NewRequest(
 		"PROPFIND",
-		serverConfig.URL+"/dav/cal/"+convert_username_into_url(username),
+		serverURL+"/dav/cal/"+convert_username_into_url(username),
 		strings.NewReader(neededXML),
 	)
 
@@ -78,7 +80,7 @@ func get_caldav_data(username string, password string) SimpleCalDavData {
 
 		var new_cal Calandar = Calandar{
 			DisplayName: davResp.Responses[i].PropStat[0].Prop.DisplayName,
-			Link:        serverConfig.URL + davResp.Responses[i].Href,
+			Link:        serverURL + davResp.Responses[i].Href,
 		}
 
 		calandars = append(calandars, new_cal)
@@ -107,7 +109,7 @@ const XML_cal string = `
 </C:calendar-query>
 `
 
-func get_calandar_data(cal Calandar, username string, password string) Calandar {
+func GetCalendarData(cal Calandar, username string, password string) Calandar {
 	req, _ := http.NewRequest(
 		"REPORT",
 		cal.Link,

caldav/helpers.go

@@ -1,4 +1,4 @@
-package main
+package caldav
 
 import "strings"
 

go.mod

@@ -2,4 +2,9 @@ module astraltech.xyz/calendar/v2
 
 go 1.26.1
 
-require github.com/arran4/golang-ical v0.3.5 // indirect
+require (
+	github.com/arran4/golang-ical v0.3.5 // indirect
+	github.com/coreos/go-oidc/v3 v3.20.0 // indirect
+	github.com/go-jose/go-jose/v4 v4.1.4 // indirect
+	golang.org/x/oauth2 v0.36.0 // indirect
+)

go.sum

@@ -1,2 +1,8 @@
 github.com/arran4/golang-ical v0.3.5 h1:bbz6ld4dC+MmCKiFfOd6SkmIGnhNMBACZ485ULh7p9A=
 github.com/arran4/golang-ical v0.3.5/go.mod h1:OnguFgjN0Hmx8jzpmWcC+AkHio94ujmLHKoaef7xQh8=
+github.com/coreos/go-oidc/v3 v3.20.0 h1:EtE0WIBHk03N+DqGkY4+UONzzZHk7amKt6IyNd7OsZE=
+github.com/coreos/go-oidc/v3 v3.20.0/go.mod h1:DYCf24+ncYi+XkIH97GY1+dqoRlbaSI26KVTCI9SrY4=
+github.com/go-jose/go-jose/v4 v4.1.4 h1:moDMcTHmvE6Groj34emNPLs/qtYXRVcd6S7NHbHz3kA=
+github.com/go-jose/go-jose/v4 v4.1.4/go.mod h1:x4oUasVrzR7071A4TnHLGSPpNOm2a21K9Kf04k1rs08=
+golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
+golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=

main/main.go

@@ -1,54 +1,21 @@
 package main
 
 import (
-	"fmt"
-	"strings"
-
+	"astraltech.xyz/calendar/v2/auth"
+	"astraltech.xyz/calendar/v2/caldav"
 	"astraltech.xyz/calendar/v2/webserver"
-	ics "github.com/arran4/golang-ical"
 )
 
-func HandleAuthRequest(username string, password string) bool {
-	calDavData := get_caldav_data(username, password)
-
-	fmt.Printf("Users display name: %s\n", calDavData.DisplayName)
-	fmt.Printf("Calandar Count: %d\n", len(calDavData.Calandars))
-	for i := range len(calDavData.Calandars) {
-		calDavData.Calandars[i] = get_calandar_data(calDavData.Calandars[i], username, password)
-
-		fmt.Printf("Cal %d is named %s\n", i, calDavData.Calandars[i].DisplayName)
-		fmt.Printf("\tLink to cal: %s\n", calDavData.Calandars[i].Link)
-		fmt.Printf("\tEvent count: %d\n", len(calDavData.Calandars[i].Events))
-		for j := range len(calDavData.Calandars[i].Events) {
-			cal, err := ics.ParseCalendar(strings.NewReader(calDavData.Calandars[i].Events[j].CalData))
-			if err != nil {
-				fmt.Print(err.Error())
-			}
-			events := cal.Events()
-			for k := range len(events) {
-				name := events[k].GetProperty(ics.ComponentProperty(ics.PropertySummary)).Value
-				start, _ := events[k].GetStartAt()
-				end, _ := events[k].GetEndAt()
-				time := end.Sub(start)
-				fmt.Printf("\t\tEvent name: %s\n", name)
-				fmt.Printf("\t\t\tEvent start date: %s\n", end.UTC().String())
-				fmt.Printf("\t\t\tEvent length date: %s\n", time.String())
-
-			}
-		}
-	}
-
-	return true
-}
-
 func main() {
+	auth.CreateTestOAuth()
 	read_config()
-	init_dav_client()
+	caldav.InitDavClient(serverConfig.URL)
 
 	webserver.ServeLoginPage("/login", webserver.CustomizableLoginData{
 		ServiceName:         "Astral Calendar",
-		AuthRequestFunction: HandleAuthRequest,
+		AuthRequestFunction: auth.HandleAuthRequest,
 	})
+	webserver.ServeWebpage("/callback", auth.OAuthCallback)
 	webserver.EnableLogoRoute()
 	webserver.EnableStaticRoute()
 	webserver.ServeWebserver()

webserver/login_page.go

@@ -10,10 +10,28 @@ type LoginPageData struct {
 	IsHiddenClassList string
 	LoginData         CustomizableLoginData
 }
+type AuthStyle int
+
+const (
+	AuthStylePassword AuthStyle = 0
+	AuthStyleOAuth    AuthStyle = 1
+)
+
+type AuthData interface{}
+
+type PasswordAuthData struct {
+	Username string
+	Password string
+}
+
+type OAuthAuthData struct {
+	ResponseWriter *http.ResponseWriter
+	Request        *http.Request
+}
 
 type CustomizableLoginData struct {
 	ServiceName         string
-	AuthRequestFunction func(string, string) bool
+	AuthRequestFunction func(AuthStyle, AuthData) bool
 }
 
 var LoginPageDataCustomizations CustomizableLoginData
@@ -27,15 +45,30 @@ func loginHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if r.Method == http.MethodPost {
-		username := r.FormValue("username")
-		if strings.Contains(username, "/") {
-			tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
-		}
-		password := r.FormValue("password")
+		action := r.FormValue("action")
 
-		auth_success := LoginPageDataCustomizations.AuthRequestFunction(username, password)
-		if auth_success == false {
-			tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+		if action == "password" {
+			username := r.FormValue("username")
+			if strings.Contains(username, "/") {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
+			password := r.FormValue("password")
+
+			auth_success := LoginPageDataCustomizations.AuthRequestFunction(AuthStylePassword, PasswordAuthData{
+				Username: username,
+				Password: password,
+			})
+			if auth_success == false {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
+		} else {
+			auth_success := LoginPageDataCustomizations.AuthRequestFunction(AuthStyleOAuth, OAuthAuthData{
+				ResponseWriter: &w,
+				Request:        r,
+			})
+			if auth_success == false {
+				tmpl.Execute(w, LoginPageData{IsHiddenClassList: "", LoginData: LoginPageDataCustomizations})
+			}
 		}
 	}
 }

webserver/pages/login_page.html

@@ -23,17 +23,20 @@
 
     <div>
         <label class="input_label">Username</label><br />
-        <input type="text" name="username" placeholder="" required />
+        <input type="text" name="username" placeholder="" />
     </div>
 
     <div>
         <label class="input_label">Password</label><br />
         <div class="password_box">
-            <input type="password" name="password" placeholder="" required />
+            <input type="password" name="password" placeholder="" />
             <button type="button" class="show_password_toggle closed"></button>
         </div>
     </div>
-    <button type="submit">Login</button>
+    <div id="login_buttons">
+        <button type="submit" name="action" value="password">Login with password</button>
+        <button type="submit" id="login_with_oauth" name="action" value="oauth"><img src="/favicon.ico"/></button>
+    </div>
 </form>
 
 <script src="/static/error/error.js" type="text/javascript"></script>

webserver/static/login_page.css

@@ -33,3 +33,23 @@
     font-size: 1.25rem;
     margin-bottom: 8px;
 }
+
+#login_buttons {
+    display: grid;
+    grid-gap: 5px;
+    grid-template-columns: 1fr 43px;
+}
+
+#login_with_oauth {
+    padding: 0 !important;
+        position: relative;
+}
+
+#login_with_oauth img {
+    position: absolute;
+    width: 30px;
+    height: 30px;
+    top: 50%;
+    left: 50%;
+    transform: translateX(-50%) translateY(-50%);
+}