Initial Commit

.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.0.6</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.springhow.examples</groupId>
+    <artifactId>spring-boot-fcm-demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>spring-boot-fcm-demo</name>
+    <description>Send FCM notifications from spring boot</description>
+
+    <properties>
+        <java.version>17</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.google.firebase</groupId>
+            <artifactId>firebase-admin</artifactId>
+            <version>9.1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

src/main/java/com/springhow/examples/springbootfcmdemo/SpringBootFcmDemoApplication.java

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+package com.springhow.examples.springbootfcmdemo;
+
+import com.google.auth.oauth2.GoogleCredentials;
+import com.google.firebase.FirebaseApp;
+import com.google.firebase.FirebaseOptions;
+import com.google.firebase.messaging.FirebaseMessaging;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.Bean;
+import org.springframework.core.io.ClassPathResource;
+
+import java.io.IOException;
+
+@SpringBootApplication
+public class SpringBootFcmDemoApplication {
+
+    @Bean
+    FirebaseMessaging firebaseMessaging() throws IOException {
+        GoogleCredentials googleCredentials = GoogleCredentials
+                .fromStream(new ClassPathResource("firebase-service-account.json").getInputStream());
+        FirebaseOptions firebaseOptions = FirebaseOptions
+                .builder()
+                .setCredentials(googleCredentials)
+                .build();
+        FirebaseApp app = FirebaseApp.initializeApp(firebaseOptions, "my-app");
+        return FirebaseMessaging.getInstance(app);
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBootFcmDemoApplication.class, args);
+    }
+
+}

src/main/java/com/springhow/examples/springbootfcmdemo/controllers/TestController.java

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+package com.springhow.examples.springbootfcmdemo.controllers;
+
+import com.google.firebase.messaging.FirebaseMessagingException;
+import com.springhow.examples.springbootfcmdemo.pojo.Note;
+import com.springhow.examples.springbootfcmdemo.service.FirebaseMessagingService;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+
+@Controller
+public class TestController {
+
+    private final FirebaseMessagingService firebaseService;
+
+    public TestController(FirebaseMessagingService firebaseService) {
+        this.firebaseService = firebaseService;
+    }
+
+    @RequestMapping("/send-notification")
+    @ResponseBody
+    public String sendNotification(@RequestBody Note note,
+                                   @RequestParam String topic) throws FirebaseMessagingException {
+        return firebaseService.sendNotification(note, topic);
+    }
+}

src/main/java/com/springhow/examples/springbootfcmdemo/pojo/Note.java

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+package com.springhow.examples.springbootfcmdemo.pojo;
+
+import lombok.Data;
+
+import java.util.Map;
+
+@Data
+public class Note {
+    private String subject;
+    private String content;
+    private Map<String, String> data;
+    private String image;
+}

src/main/java/com/springhow/examples/springbootfcmdemo/service/FirebaseMessagingService.java

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+package com.springhow.examples.springbootfcmdemo.service;
+
+import com.google.firebase.messaging.*;
+import com.springhow.examples.springbootfcmdemo.pojo.Note;
+import org.springframework.stereotype.Service;
+
+@Service
+public class FirebaseMessagingService {
+
+    private final FirebaseMessaging firebaseMessaging;
+
+    public FirebaseMessagingService(FirebaseMessaging firebaseMessaging) {
+        this.firebaseMessaging = firebaseMessaging;
+    }
+
+
+    public String sendNotification(Note note, String topic) throws FirebaseMessagingException {
+
+        Notification notification = Notification
+                .builder()
+                .setTitle(note.getSubject())
+                .setBody(note.getContent())
+                .setImage(note.getImage())
+                .build();
+
+        Message message = Message
+                .builder()
+                .setTopic(topic)
+                .setNotification(notification)
+                .putAllData(note.getData())
+                .build();
+
+        return firebaseMessaging.send(message);
+    }
+
+}

src/main/resources/application.properties

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+

src/main/resources/firebase-service-account.json

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+{
+  "type": "service_account",
+  "project_id": "spring-demo",
+  "private_key_id": "d159fd09beREDACTED9599d1ead79acdf23125",
+  "private_key": "<<<<REDACTED>>>>",
+  "client_email": "[email protected]",
+  "client_id": "1078469REDACTED4481171",
+  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
+  "token_uri": "https://oauth2.googleapis.com/token",
+  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
+  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/firebase-adminsdk-himxs%40spring-demo.iam.gserviceaccount.com"
+}