Added option to delete stored file from Amazon S3.

Author: nikhilsharma8193

README.md

@@ -4,7 +4,7 @@ A plugin for multi purpose file upload functionality for Grails 3 application. T
 to the following destinations:
 
 1. To the local server or the local system
-2. To the Amazon S3 storage (coming soon)
+2. To the Amazon S3 storage (can be deleted as well)
 3. To the Rackspace cloud storage (coming soon)
 
 ## Installation

build.gradle

@@ -9,7 +9,7 @@ buildscript {
     }
 }
 
-version "0.0.5"
+version "0.0.6"
 group "com.wizpanda.plugins"
 
 apply plugin:"eclipse"

grails-app/domain/com/wizpanda/file/StoredFile.groovy

@@ -1,5 +1,7 @@
 package com.wizpanda.file
 
+import grails.util.Holders
+
 class StoredFile {
 
     String originalName
@@ -9,4 +11,15 @@ class StoredFile {
     Long size
     Date uploadedOn = new Date()
     Map meta = [:]
+
+    void delete() {
+        FileUploadService fileUploadService = Holders.getApplicationContext()['fileUploadService']
+
+        if (!fileUploadService) {
+            log.warn "FileUploadService bean not injected!"
+            return
+        }
+
+        fileUploadService.delete(this)
+    }
 }

grails-app/services/com/wizpanda/file/FileUploadService.groovy

@@ -23,6 +23,15 @@ class FileUploadService {
         return services.get(groupName).instance().save(file)
     }
 
+    void delete(StoredFile file) {
+        if (!file) {
+            log.warn 'StoredFile is null.'
+            return
+        }
+
+        services.get(file.groupName).instance().delete(file)
+    }
+
     @PostConstruct
     void verifyConfig() {
         //log.debug "Verifying all service"

src/main/groovy/com/wizpanda/file/api/AmazonS3Api.groovy

@@ -4,6 +4,7 @@ import com.wizpanda.file.StoredFile
 import com.wizpanda.file.service.AmazonS3UploaderService
 import grails.util.Environment
 import grails.util.GrailsStringUtils
+import groovy.util.logging.Slf4j
 import org.jclouds.ContextBuilder
 import org.jclouds.aws.s3.AWSS3Client
 import org.jclouds.blobstore.BlobStore
@@ -12,6 +13,7 @@ import org.jclouds.s3.domain.internal.MutableObjectMetadataImpl
 
 import javax.activation.MimetypesFileTypeMap
 
+@Slf4j
 abstract class AmazonS3Api extends AbstractStorageApi {
 
     BlobStore blobStore
@@ -20,15 +22,15 @@ abstract class AmazonS3Api extends AbstractStorageApi {
     AmazonS3UploaderService service
 
     void authenticate() {
-        println service.accessKey
-        println service.accessSecret
         context = ContextBuilder.newBuilder("aws-s3")
                 .credentials(service.accessKey, service.accessSecret)
                 .buildView(BlobStoreContext.class)
-        println "Context created ${context.class}"
+
+        log.info "Context created ${context.class}"
 
         blobStore = context.getBlobStore()
-        println "BlobStore ${blobStore.class}"
+
+        log.info "BlobStore ${blobStore.class}"
 
         // Storing wrapped Api of S3Client with Apache JCloud
         client = context.unwrap().getApi()
@@ -75,6 +77,21 @@ abstract class AmazonS3Api extends AbstractStorageApi {
 
     @Override
     void deleteNativeFile(StoredFile file) {
-        // TODO implement me
+        String container = this.containerName
+        String fileName = file.name
+
+        log.info "Deleting file ${file} with name ${fileName} from container ${container}."
+
+        this.authenticate()
+
+        if (!client.objectExists(container, fileName)) {
+            log.warn "File not present in the S3 bucket."
+            return
+        }
+
+        client.deleteObject(container, fileName)
+        file.delete(flush: true)
+
+        this.close()
     }
 }