added google authentication

.gitignore

@@ -4,4 +4,5 @@
 *.pem
 edusync-7bd5e-firebase-adminsdk-x49uh-af084a6314.json
 edusync-test-firebase-adminsdk-hk5kl-9af0162b09.json
-.env
+.env
+config.json

auth.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"html/template"
+	"net/http"
+
+	"github.com/gorilla/pat"
+	"github.com/gorilla/sessions"
+	"github.com/markbates/goth"
+	"github.com/markbates/goth/gothic"
+	"github.com/markbates/goth/providers/google"
+)
+
+// AuthHandler sets up the authentication routes on the provided router
+func AuthHandler(router *pat.Router, config *Config) {
+	maxAge := 86400 * 30 // 30 days
+	isProd := true       // Set to true when serving over https
+
+	store := sessions.NewCookieStore([]byte(config.SessionSecret))
+	store.MaxAge(maxAge)
+	store.Options.Path = "/"
+	store.Options.HttpOnly = true // HttpOnly should always be enabled
+	store.Options.Secure = isProd
+
+	gothic.Store = store
+
+	goth.UseProviders(
+		google.New(config.GoogleClientID, config.GoogleClientSecret, "https://localhost:8080/auth/google/callback", "email", "profile"),
+	)
+
+	router.Get("/auth/{provider}/callback", func(res http.ResponseWriter, req *http.Request) {
+		user, err := gothic.CompleteUserAuth(res, req)
+		if err != nil {
+			fmt.Fprintln(res, err)
+			return
+		}
+		t, _ := template.ParseFiles("templates/success.html")
+		t.Execute(res, user)
+	})
+
+	router.Get("/auth/{provider}", func(res http.ResponseWriter, req *http.Request) {
+		gothic.BeginAuthHandler(res, req)
+	})
+
+	router.Get("/", func(res http.ResponseWriter, req *http.Request) {
+		t, _ := template.ParseFiles("templates/index.html")
+		t.Execute(res, false)
+	})
+}

config.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+// Config struct to hold the configuration
+type Config struct {
+	GoogleClientID     string `json:"google_client_id"`
+	GoogleClientSecret string `json:"google_client_secret"`
+	SessionSecret      string `json:"session_secret"`
+}
+
+// LoadConfig reads the configuration from a file
+func LoadConfig(file string) (*Config, error) {
+	var config Config
+	configFile, err := os.Open(file)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open config file: %w", err)
+	}
+	defer configFile.Close()
+
+	decoder := json.NewDecoder(configFile)
+	err = decoder.Decode(&config)
+	if err != nil {
+		return nil, fmt.Errorf("cannot decode config JSON: %w", err)
+	}
+
+	return &config, nil
+}

go.mod

@@ -26,7 +26,13 @@ require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
 	github.com/googleapis/gax-go/v2 v2.12.4 // indirect
+	github.com/gorilla/context v1.1.2 // indirect
+	github.com/gorilla/mux v1.8.1 // indirect
+	github.com/gorilla/pat v1.0.2 // indirect
+	github.com/gorilla/securecookie v1.1.2 // indirect
+	github.com/gorilla/sessions v1.3.0 // indirect
 	github.com/joho/godotenv v1.5.1 // indirect
+	github.com/markbates/goth v1.80.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.49.0 // indirect

go.sum

@@ -80,8 +80,20 @@ github.com/googleapis/enterprise-certificate-proxy v0.3.2 h1:Vie5ybvEvT75RniqhfF
 github.com/googleapis/enterprise-certificate-proxy v0.3.2/go.mod h1:VLSiSSBs/ksPL8kq3OBOQ6WRI2QnaFynd1DCjZ62+V0=
 github.com/googleapis/gax-go/v2 v2.12.4 h1:9gWcmF85Wvq4ryPFvGFaOgPIs1AQX0d0bcbGw4Z96qg=
 github.com/googleapis/gax-go/v2 v2.12.4/go.mod h1:KYEYLorsnIGDi/rPC8b5TdlB9kbKoFubselGIoBMCwI=
+github.com/gorilla/context v1.1.2 h1:WRkNAv2uoa03QNIc1A6u4O7DAGMUVoopZhkiXWA2V1o=
+github.com/gorilla/context v1.1.2/go.mod h1:KDPwT9i/MeWHiLl90fuTgrt4/wPcv75vFAZLaOOcbxM=
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
+github.com/gorilla/pat v1.0.2 h1:TDh/RulbnPxMQACcwbgMF5Bf00jaGoeYBNu+XUFuwtE=
+github.com/gorilla/pat v1.0.2/go.mod h1:ioQ7dFQ2KXmOmWLJs6vZAfRikcm2D2JyuLrL9b5wVCg=
+github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kXD8ePA=
+github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
+github.com/gorilla/sessions v1.3.0 h1:XYlkq7KcpOB2ZhHBPv5WpjMIxrQosiZanfoy1HLZFzg=
+github.com/gorilla/sessions v1.3.0/go.mod h1:ePLdVu+jbEgHH+KWw8I1z2wqd0BAdAQh/8LRvBeoNcQ=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
 github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
+github.com/markbates/goth v1.80.0 h1:NnvatczZDzOs1hn9Ug+dVYf2Viwwkp/ZDX5K+GLjan8=
+github.com/markbates/goth v1.80.0/go.mod h1:4/GYHo+W6NWisrMPZnq0Yr2Q70UntNLn7KXEFhrIdAY=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=

main.go

@@ -3,6 +3,8 @@ package main
 import (
 	"log"
 	"net/http"
+
+	"github.com/gorilla/pat"
 )
 
 func init() {
@@ -25,7 +27,22 @@ func main() {
 	// http.ListenAndServeTLS("192.168.1.129:8080", "server.crt", "server.key", handler())
 
 	// err := http.ListenAndServeTLS(":8080", "server.crt", "server.key", handler())
-	err := http.ListenAndServeTLS(":8080", "cert.pem", "key.pem", handler())
+
+	// Load configuration
+	config, err := LoadConfig("config.json")
+	if err != nil {
+		log.Fatalf("could not load config: %v", err)
+	}
+
+	// Create a new router
+	router := pat.New()
+
+	// Set up authentication routes
+	AuthHandler(router, config)
+
+	// Start the HTTPS server with the provided certificate and key files
+	log.Println("listening on localhost:8080")
+	err = http.ListenAndServeTLS(":8080", "cert.pem", "key.pem", router)
 	if err != nil {
 		log.Fatal(err)
 	}