feat: read project id from config file

firebase/client.go

@@ -0,0 +1,72 @@
+package firebase
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+
+	firebase "firebase.google.com/go"
+	"firebase.google.com/go/auth"
+	s "github.com/bitfield/script"
+)
+
+const firebaseProjectConfig string = "./.firebaserc"
+const defaultProject = "default"
+
+type Firebase struct {
+	app       *firebase.App
+	projectId string
+}
+
+func (f *Firebase) setProjectID(projectId string) error {
+
+	configFileContent, err := s.File(firebaseProjectConfig).Bytes()
+
+	if err != nil {
+		return fmt.Errorf("An error occurred while reading config file: %w", err)
+	}
+
+	var decodedConfigs *FirebaseProjectConfigs
+
+	err = json.Unmarshal(configFileContent, &decodedConfigs)
+
+	if err != nil {
+		return fmt.Errorf("An error occurred while reading config file: %w", err)
+	}
+
+	f.projectId = decodedConfigs.Projects[projectId]
+
+	return nil
+}
+
+func (f *Firebase) InitializeFirbeaseApp(ctx context.Context, projectId string) error {
+
+	if projectId == "" {
+		projectId = defaultProject
+	}
+
+	err := f.setProjectID(projectId)
+
+	if err != nil {
+		return fmt.Errorf("An error occurred while reading config file: %w", err)
+	}
+
+	configs := &firebase.Config{
+		ProjectID: f.projectId,
+	}
+
+	app, err := firebase.NewApp(ctx, configs)
+
+	if err != nil {
+		log.Fatalf("error initializing app: %v\n", err)
+	}
+
+	f.app = app
+
+	return nil
+}
+
+func (f *Firebase) auth(ctx context.Context) (*auth.Client, error) {
+	return f.app.Auth(ctx)
+}