Reapply "Merge pull request #3 from Marcel2511/revert-2-revert-1-p2t-…

…webservice-BackendTestsLLM"

This reverts commit 0aa380b.

.gitignore

@@ -33,4 +33,3 @@ build/
 
 ### VS Code ###
 .vscode/
-

pom.xml

@@ -232,12 +232,12 @@
                         <id>spotless-check</id>
                         <phase>compile</phase>
                         <goals>
-                            <goal>check</goal>
+                            <goal>apply</goal>
                         </goals>
                     </execution>
                 </executions>
             </plugin>
         </plugins>
     </build>
-
+    
 </project>

src/main/java/de/dhbw/woped/process2text/config/WebConfig.java

@@ -0,0 +1,32 @@
+package de.dhbw.woped.process2text.config;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+public class WebConfig {
+
+  private static final Logger logger = LoggerFactory.getLogger(WebConfig.class);
+
+  @Bean
+  @Primary
+  public WebMvcConfigurer corsConfigurer() {
+    return new WebMvcConfigurer() {
+      @Override
+      public void addCorsMappings(CorsRegistry registry) {
+        logger.info("Applying CORS configuration");
+        registry
+            .addMapping("/**")
+            .allowedOrigins("http://localhost:4200", "http://localhost:3000/")
+            .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
+            .allowedHeaders("*")
+            .allowCredentials(true);
+      }
+    };
+  }
+}

src/main/java/de/dhbw/woped/process2text/controller/P2TController.java

@@ -1,5 +1,6 @@
 package de.dhbw.woped.process2text.controller;
 
+import de.dhbw.woped.process2text.service.P2TLLMService;
 import de.dhbw.woped.process2text.service.P2TService;
 import io.swagger.annotations.ApiOperation;
 import lombok.extern.slf4j.Slf4j;
@@ -8,24 +9,42 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
+@CrossOrigin(origins = "http://localhost:4200")
 @RestController
 @Slf4j
 public class P2TController {
 
   Logger logger = LoggerFactory.getLogger(P2TController.class);
 
-  @Autowired P2TService p2tService;
+  @Autowired private P2TService p2tService;
+
+  @Autowired private P2TLLMService llmService;
 
   @ApiOperation(value = "Translate a process model into human readable text.")
   @PostMapping(value = "/generateText", consumes = "text/plain", produces = "text/plain")
   protected String generateText(@RequestBody String body) {
-    if (logger
-        .isDebugEnabled()) { // required so that body.replaceAll is only invoked in case the body is
-      // logged
-      logger.debug(body.replaceAll("[\n\r\t]", "_"));
+    if (logger.isDebugEnabled()) {
+      logger.debug("Received body: " + body.replaceAll("[\n\r\t]", "_"));
     }
-    return p2tService.generateText(body);
+    String response = p2tService.generateText(body);
+    logger.debug("Response: " + response);
+    return response;
   }
-}
 
-// TEST
+  @ApiOperation(
+      value =
+          "Translate a process model into human readable text using OpenAIs Large Language Model"
+              + " GPT-4 Turbo.")
+  @PostMapping(value = "/generateTextLLM", consumes = "text/plain", produces = "text/plain")
+  protected String generateTextLLM(
+      @RequestBody String body,
+      @RequestParam(required = false) String apiKey,
+      @RequestParam(required = false) String prompt) {
+    if (logger.isDebugEnabled()) {
+      logger.debug("Received body: " + body.replaceAll("[\n\r\t]", "_"));
+    }
+    String response = llmService.callLLM(body, apiKey, prompt);
+    logger.debug("LLM Response: " + response);
+    return response;
+  }
+}

src/main/java/de/dhbw/woped/process2text/service/P2TLLMService.java

@@ -0,0 +1,37 @@
+package de.dhbw.woped.process2text.service;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
+import org.springframework.stereotype.Service;
+import org.springframework.web.client.RestTemplate;
+
+@Service
+public class P2TLLMService {
+
+  public String callLLM(String text, String apiKey, String prompt) {
+    String apiUrl = "https://api.openai.com/v1/chat/completions";
+    RestTemplate restTemplate = new RestTemplate();
+
+    HttpHeaders headers = new HttpHeaders();
+    headers.set("Authorization", "Bearer " + apiKey);
+    headers.setContentType(MediaType.APPLICATION_JSON);
+
+    Map<String, Object> requestBody = new HashMap<>();
+    requestBody.put("model", "gpt-4-turbo");
+    requestBody.put(
+        "messages",
+        List.of(
+            Map.of("role", "system", "content", "You are a helpful assistant."),
+            Map.of("role", "user", "content", prompt)));
+    requestBody.put("max_tokens", 4096);
+    requestBody.put("temperature", 0.7);
+
+    HttpEntity<Map<String, Object>> entity = new HttpEntity<>(requestBody, headers);
+
+    return restTemplate.postForObject(apiUrl, entity, String.class);
+  }
+}