feat: migrate REST endpoints to Azure Functions HTTP triggers

- Replace UserController with UserHandler leveraging Azure Functions annotations
- Enable deployment using local.settings.json and updated host.json location
- Update pom.xml for Azure plugin and function adapter configuration
- Remove unused web starter dependency and revise artifact for Azure support
- Improve code modularity and compatibility with serverless platform

Author: eggboy

.gitignore

@@ -33,6 +33,5 @@ build/
 .vscode/
 
 ### Azure Functions ###
-local.settings.json
 obj/
 bin/

src/main/resources/host.json host.jsonsrc/main/resources/host.json renamed to host.json

@@ -0,0 +1,8 @@
+{
+  "IsEncrypted": false,
+  "Values": {
+    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
+    "FUNCTIONS_WORKER_RUNTIME": "java",
+    "FUNCTIONS_EXTENSION_VERSION": "~4"
+  }
+}

local.settings.json

@@ -23,17 +23,13 @@
         <functionAppName>springcloud-azurefunction</functionAppName>
     </properties>
     <dependencies>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.cloud</groupId>
-            <artifactId>spring-cloud-function-adapter-azure-web</artifactId>
+            <artifactId>spring-cloud-function-adapter-azure</artifactId>
         </dependency>
 
         <dependency>
@@ -79,7 +75,8 @@
                 <version>${azure.functions.maven.plugin.version}</version>
                 <configuration>
                     <appName>${functionAppName}</appName>
-                    <hostJson>${project.basedir}/src/main/resources/host.json</hostJson>
+                    <hostJson>${project.basedir}/host.json</hostJson>
+                    <localSettingsJson>${project.basedir}/local.settings.json</localSettingsJson>
                     <runtime>
                         <os>linux</os>
                         <javaVersion>21</javaVersion>

pom.xml

@@ -0,0 +1,62 @@
+package io.jaylee.springcloud.handler;
+
+import com.microsoft.azure.functions.*;
+import com.microsoft.azure.functions.annotation.AuthorizationLevel;
+import com.microsoft.azure.functions.annotation.BindingName;
+import com.microsoft.azure.functions.annotation.FunctionName;
+import com.microsoft.azure.functions.annotation.HttpTrigger;
+import io.jaylee.springcloud.model.UserDTO;
+import io.jaylee.springcloud.service.UserService;
+import org.springframework.stereotype.Component;
+
+import java.util.Optional;
+
+@Component
+public class UserHandler {
+
+    private final UserService userService;
+
+    public UserHandler(UserService userService) {
+        this.userService = userService;
+    }
+
+    @FunctionName("getUser")
+    public HttpResponseMessage getUser(
+            @HttpTrigger(name = "request",
+                    methods = {HttpMethod.GET},
+                    route = "user/{userId}",
+                    authLevel = AuthorizationLevel.ANONYMOUS)
+            HttpRequestMessage<Optional<String>> request,
+            @BindingName("userId") String userId,
+            ExecutionContext context) {
+        context.getLogger().info("Getting user: " + userId);
+        UserDTO user = userService.getUser(userId);
+        return request.createResponseBuilder(HttpStatus.OK)
+                .body(user)
+                .header("Content-Type", "application/json")
+                .build();
+    }
+
+    @FunctionName("createUser")
+    public HttpResponseMessage createUser(
+            @HttpTrigger(name = "request",
+                    methods = {HttpMethod.POST},
+                    route = "user",
+                    authLevel = AuthorizationLevel.ANONYMOUS)
+            HttpRequestMessage<Optional<UserDTO>> request,
+            ExecutionContext context) {
+        context.getLogger().info("Creating user");
+        UserDTO userDTO = request.getBody()
+                .orElse(null);
+        if (userDTO == null) {
+            return request.createResponseBuilder(HttpStatus.BAD_REQUEST)
+                    .body("Request body is required")
+                    .build();
+        }
+        String userId = userService.saveUser(userDTO);
+        return request.createResponseBuilder(HttpStatus.OK)
+                .body(userId)
+                .header("Content-Type", "application/json")
+                .build();
+    }
+}