(Feat): Initial Commit

internal/push/provider/fcm_provider.go

@@ -0,0 +1,76 @@
+package provider
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net/http"
+
+	"allaboutapps.dev/aw/go-starter/internal/push"
+	"google.golang.org/api/fcm/v1"
+	"google.golang.org/api/googleapi"
+	"google.golang.org/api/option"
+)
+
+type FCM struct {
+	Config  FCMConfig
+	service *fcm.Service
+}
+
+type FCMConfig struct {
+	GoogleApplicationCredentials string `json:"-"` // sensitive
+	ProjectID                    string
+	ValidateOnly                 bool
+}
+
+func NewFCM(config FCMConfig, opts ...option.ClientOption) (*FCM, error) {
+	ctx := context.Background()
+	fcmService, err := fcm.NewService(ctx, opts...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create FCM service: %w", err)
+	}
+
+	return &FCM{
+		Config:  config,
+		service: fcmService,
+	}, nil
+}
+
+func (p *FCM) GetProviderType() push.ProviderType {
+	return push.ProviderTypeFCM
+}
+
+func (p *FCM) Send(token string, title string, message string) push.ProviderSendResponse {
+	// https: //godoc.org/google.golang.org/api/fcm/v1#SendMessageRequest
+	// https://firebase.google.com/docs/cloud-messaging/send-message#rest
+	messageRequest := &fcm.SendMessageRequest{
+		ValidateOnly: p.Config.ValidateOnly,
+		Message: &fcm.Message{
+			Token: token,
+			Notification: &fcm.Notification{
+				Title: title,
+				Body:  message,
+			},
+		},
+	}
+
+	_, err := p.service.Projects.Messages.Send("projects/"+p.Config.ProjectID, messageRequest).Do()
+	valid := true
+	if err != nil {
+		// convert to original error and determine if the token was at fault
+		var gErr *googleapi.Error
+		if errors.As(err, &gErr) {
+			valid = (gErr.Code != http.StatusNotFound && gErr.Code != http.StatusBadRequest)
+		}
+	}
+
+	return push.ProviderSendResponse{
+		Token: token,
+		Valid: valid,
+		Err:   err,
+	}
+}
+
+func (p *FCM) SendMulticast(tokens []string, title, message string) []push.ProviderSendResponse {
+	return sendMulticastWithProvider(p, tokens, title, message)
+}