Initial work on S3 integration.

build.gradle

@@ -33,6 +33,10 @@ dependencies {
     testImplementation('org.springframework.boot:spring-boot-starter-test') {
         exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
     }
+
+    implementation platform('com.amazonaws:aws-java-sdk-bom:1.11.714')
+    implementation 'com.amazonaws:aws-java-sdk-s3'
+
 }
 
 test {

src/main/java/com/lmco/spectrum/systemnavigation3d/controller/ResourceController.java

@@ -0,0 +1,29 @@
+package com.lmco.spectrum.systemnavigation3d.controller;
+
+import com.lmco.spectrum.systemnavigation3d.service.ResourceService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Controller
+@RequestMapping("api/resources")
+public class ResourceController {
+
+    @Autowired
+    ResourceService resourceService;
+
+    @RequestMapping(value = "/pdf/{id}", method = RequestMethod.GET)
+    public ResponseEntity<?> testEndpoint(@PathVariable("id") Long id){
+        // TODO call ResourceService
+        String x = resourceService.getFileTest();
+        if(x == null) {
+            return new ResponseEntity<>(HttpStatus.INTERNAL_SERVER_ERROR);
+        }
+        return ResponseEntity.ok(x);
+    }
+
+}

src/main/java/com/lmco/spectrum/systemnavigation3d/service/AmazonClient.java

@@ -0,0 +1,45 @@
+package com.lmco.spectrum.systemnavigation3d.service;
+
+import com.amazonaws.auth.profile.ProfileCredentialsProvider;
+import com.amazonaws.services.s3.AmazonS3;
+import com.amazonaws.services.s3.AmazonS3ClientBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.PostConstruct;
+
+@Service
+public class AmazonClient {
+
+    private static final Logger log = LoggerFactory.getLogger(AmazonClient.class);
+
+    private AmazonS3 amazonS3;
+
+    @Value("${app.s3.credentialsProfile}")
+    private String s3CredentialsProfile;
+    @Value("${app.s3.bucket}")
+    private String s3Bucket;
+    @Value("${app.s3.region}")
+    private String s3Region;
+
+    @PostConstruct
+    private void initializeAmazon() {
+        log.debug("Connecting to Amazon S3 using credentials profile {} on region {}.", s3CredentialsProfile, s3Region);
+        log.debug("Using bucket {}.", s3Bucket);
+        this.amazonS3 = AmazonS3ClientBuilder.standard()
+                .withCredentials(new ProfileCredentialsProvider(s3CredentialsProfile))
+                .withRegion(s3Region)
+                .build();
+    }
+
+    public AmazonS3 getAmazonS3Connection() {
+        return this.amazonS3;
+    }
+
+    public String getS3Bucket() {
+        return this.s3Bucket;
+    }
+
+}

src/main/java/com/lmco/spectrum/systemnavigation3d/service/ResourceService.java

@@ -0,0 +1,30 @@
+package com.lmco.spectrum.systemnavigation3d.service;
+
+import com.amazonaws.services.s3.AmazonS3;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StreamUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+
+@Service
+public class ResourceService {
+
+    @Autowired
+    AmazonClient amazonClient;
+
+    @Nullable
+    public String getFileTest() {
+        AmazonS3 amazonS3 = amazonClient.getAmazonS3Connection();
+        try (InputStream is = amazonS3.getObject(amazonClient.getS3Bucket(), "test.txt").getObjectContent()) {
+            return StreamUtils.copyToString(is, StandardCharsets.UTF_8);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+}

src/main/resources/application.properties

@@ -1 +1,5 @@
 server.servlet.contextPath=/3dsysnavbackend
+
+app.s3.credentialsProfile=s3
+app.s3.bucket=3dsysnavstorage
+app.s3.region=us-west-2