Revision as of 11:16, 14 May 2021

Overview

The StorageHub APIs components provide a simple access to StorageHub service.

It is conceived to support both Java and REST-based calls.

Dependencies

Maven coordinates

<dependency>
<groupId>org.gcube.common</groupId>
<artifactId>storagehub-client-library</artifactId>
<version>[1.0.0,2.0.0)</version>
</dependency>

Key features

Users must use the personal token to access the REST interface. They can access just their own files and the folders shared with them.

StorageHub REST interface supports the following operations:

• Retrieve WS: to retrieve the user Workspace;
• Folder Listing: to list the content of a folder;
• Retrieve VRE Folder: to retrieve the VREFolder related to the token;
• Find: to find a file or a folder by name or pattern;
• Delete: to remove a file or a folder (including subfolders);
• Download: to download a file or a folder in ZIP format;
• Get Public Link: to get a public link of a file;
• Create Folder: to create a folder in the given parent folder;
• Unzip: to upload a zip file in a specific folder;
• Upload file: to upload a file in a folder.
• Versions: to get a specific version of a file;

API

The base-url of this service on D4Science production is the following:

https://api.d4science.org/workspace

Retrieve Workspace

Returns the Item representing the workspace of the user retrieved by the token used for the call.

Java

import org.gcube.common.storagehub.client.dsl.StorageHubClient;
import org.gcube.common.storagehub.client.dsl.FileContainer;
import org.gcube.common.storagehub.model.items.Item;
 
 
 StorageHubClient shc = new StorageHubClient();
 FolderContainer rootContainer = shc.getWSRoot()

REST API

GET /workspace/?gcube-token={user-token}

responses

200 The workspace root item (in json format) is returned.

500 The error is specified in the body of the response message

Get Item ById

Java

import org.gcube.common.storagehub.client.dsl.FileContainer;
import org.gcube.common.storagehub.client.dsl.StorageHubClient;
import org.gcube.common.storagehub.model.items.Item;
 
...
 
String theId = {itemIdentifier} // the identifier of the item 
StorageHubClient shc = new StorageHubClient();
FileContainer fileContainer = shc.open(theId).asFile();

List Item Versions, Get Item Version

Java

import org.gcube.common.storagehub.client.dsl.FileContainer;
import org.gcube.common.storagehub.client.dsl.StorageHubClient;
import org.gcube.common.storagehub.model.items.Item;
import org.gcube.common.storagehub.model.service.Version;
 
...
 
String theId = {itemIdentifier} // the identifier of the item 
StorageHubClient shc = new StorageHubClient();
FileContainer fileContainer = shc.open(theId).asFile();
List<Version> fileVersions = fileContainer.getVersions();
 
//to download a version
fileContainer.downloadSpecificVersion(versionName)

Folder Listing

Returns the content of a Folder

Java

import org.gcube.common.storagehub.model.items.*;
 
...
 
StorageHubClient shc = new StorageHubClient();
FolderContainer folderContainer = shc.open("{folderIdentifier}").asFolder();
List<? extends Item> items = folderContainer.list().getItems();
 
for (Item item :  items) {
	System.out.println("name:" + item.getName() + " is a File?: " + (item instanceof AbstractFileItem));
	System.out.println("name:" + item.getName() + " is a folder?: " + (item instanceof FolderItem));
	System.out.println("name:" + item.getName() + " is a shared folder?: " + (item instanceof SharedFolder));
	System.out.println("name:" + item.getName() + " is a VRE folder?: " + (item instanceof VreFolder));
}

... //hide folder

	folderContainer.setHidden();

REST API

GET /workspace/items/{folder-identifier}/children?gcube-token={userToken}

responses

200 the list of the Items (in JSON format)

500 The error is specified in the body of the response message

Retrieve VRE Folder

Return the Item representing the root of the VRE folder related to the user token.

Java

 StorageHubClient shc = new StorageHubClient();
 FolderContainer rootContainer = shc.openVREFolder();

Check that a folder with name "FolderNameToCheck" exists in the VRE folder related to the user token.

Java

import org.gcube.common.storagehub.client.dsl.*;
import org.gcube.common.storagehub.model.exceptions.StorageHubException;
 
...
 
StorageHubClient shc = new StorageHubClient();
FolderContainer vreFolder = shc.openVREFolder();
FolderContainer folderToCheck = null;
try { 
      OpenResolver oRes = vreFolder.openByRelativePath("FolderNameToCheck");
      folderToCheck = oRes.asFolder();
} catch (StorageHubException e) {
     System.out.println("FolderNameToCheck does not exists in VRE Folder, creating it");
     folderToCheck = vreFolder.newFolder("FolderNameToCheck description goes here");
}

REST API

GET /workspace/vrefolder?gcube-token={user-token}

responses

200 The VRE folder root item (in json format) is returned.

500 The error is specified in the body of the response message

Create Folder

Creates a new folder under another folder (specified by its id)

Java

   StorageHubClient shc = new StorageHubClient();
   FolderContainer root = shc.getWSRoot();
   //Creating the folder on the root workspace folder
   root.newFolder("name", "description");

REST API

POST /workspace/items/{destiantion-folder-id}/create/FOLDER?gcube-token={user-token} Content-Type: application/x-www-form-urlencoded {String name, String description, boolean hidden}

responses

200 The Folder item identifier is returned.

500 The error is specified in the body of the response message

Share Folder

Shares a folder between users setting the access type (WRITE_ALL, ADMINISTRATOR, READ_ONLY, WRITE_OWNER)

JAVA

StorageHubClient shc = new StorageHubClient();
shc.open("{folderID}").asFolder().share(Arrays.asList("user1",.."userN"), AccessType.WRITE_ALL);

Move Item

Moves a file or a folder (including subfolders) on another folder.

Java

ItemContainer<Item> item = shc.open("itemToMoveId").asItem();
FolderContainer destinationFolder = shc.open("destination").asFolder();
file.move(destinationFolder);

REST API

PUT /workspace/items/{item-to-move-id}/move/?gcube-token={user-token} Content-Type: application/x-www-form-urlencoded {String destinationId}

Delete Item

Deletes (moves to the trash bin or permanently) a file or folder (including subfolders) given its id;

Java

String theId = {itemIdentifier} // the identifier of the item 
StorageHubClient shc = new StorageHubClient();
FileContainer fileContainer = shc.open(theId).asFile();
fileContainer.delete();

REST API

DELETE /workspace/items/{id}?gcube-token={user-token} (moves to the trash)

DELETE /workspace/items/{id}?force=true&gcube-token={user-token} (delete permanently)

responses

200 The Folder or item is deleted

500 The error is specified in the body of the response message

Empty Trash

Removes all the items from the trash

JAVA

 
StorageHubClient shc = new StorageHubClient();
shc.emptyTrash();

Download File or Folder

Java

import org.gcube.common.storagehub.client.dsl.FileContainer;
import org.gcube.common.storagehub.client.dsl.StorageHubClient;
import org.gcube.common.storagehub.model.items.Item;
 
...
 
String theId = {itemIdentifier} // the identifier of the item 
StorageHubClient shc = new StorageHubClient();
StreamDescriptor streamDescr = shc.open(theId).asFile().download();
 
File output = {output file};
try (BufferedInputStream bi = new BufferedInputStream(streamDescr.getStream()); FileOutputStream fo = new FileOutputStream(output)){
	byte[] buf = new byte[2046];			
	int read = -1;
	while ((read=bi.read(buf))!=-1) {
		fo.write(buf, 0, read);
	}
}

REST API

GET /workspace/items/{itemId}/download?gcube-token={user-token}

Please note: in case the itemId corresponds to a folder you will get a compressed file (zip) of the folder with all its content.

Upload File

Creates a new file under a folder (specified by its id)

Java

   StorageHubClient shc = new StorageHubClient();
   FolderContainer root = shc.getWSRoot();
   //Creating the folder on the root workspace folder
   FileContainer file = null;
   try(InputStream is = new FileInputStream(new File("{file-to-upload}"))){
	file = root.uploadFile(is, "name", "description");
        System.out.println("Uploaded " + file.get().getName() + " - Returned Workspace id=" + file.getId());	
   } catch (Exception e) {
	//print the error
   }

REST API

POST /workspace/items/{destination-folder-id}/create/FILE?gcube-token={user-token} Content-Type: multipart/form-data {String name, String description, File file}

CURL Example

curl -F "name=hspentest.csv" -F "description=desc" -F "file=@/home/lucio/Downloads/hspen.csv" protocol://host:port/storagehub/workspace/items/{folder-destination-id}/create/FILE?gcube-token={token}

Upload Archive

Extract the content of the specified archive in a destination Folder (specified by its id)

Java

   StorageHubClient shc = new StorageHubClient();
   FolderContainer root = shc.getWSRoot();
   //Creating the folder on the root workspace folder
   FileContainer file = null;
   try(InputStream is = new FileInputStream(new File("{file-to-upload}"))){
	file = root.uploadArchive(is, "parentFolderName");
   } catch (Exception e) {
	//print the error
   }

REST API

POST /workspace/items/{destination-folder-id}/create/ARCHIVE?gcube-token={user-token} Content-Type: multipart/form-data {String parentFolderName, File file}

CURL Example

curl -F "parentFolderName=hspentest.csv" -F "file=@/home/lucio/Downloads/hspen.csv" protocol://host:port/storagehub/workspace/items/{folder-destination-id}/create/ARCHIVE?gcube-token={token}

Get Public Url of a File

Returns the public URL of a file

Java

   StorageHubClient shc = new StorageHubClient();
   shc.open({item-id}).asFile().getPublicLink();
 
   //returns the public link for a specific version of the file  
   shc.open({item-id}).asFile().getPublicLink({file-version});

REST API

GET /workspace/items/{item-id}/publiclink?gcube-token={user-token}&version={file-version} //version is optional

Find By Name

Returns all the items with a name that matches a pattern on the first level of a given folder. The result will be empty in case of none of the item in the folder matches the pattern. Wildcard (*) can be used at the start or the end of the pattern (eg. starts with *{name}, ends with = {name}*)

Java

   StorageHubClient shc = new StorageHubClient();
   //getting my root workspace folder
   FolderContainer myRoot = shc.getWSRoot();
   myRoot.findByName("{pattern}");

REST API

GET /workspace/items/{parent-folder-id}/items/{pattern}?gcube-token={user-token}

responses

200 A JSON with the retrieved items or an empty itemList.

500 The error is specified in the body of the response message

DataMiner and SAI Interactions

Algorithms created in SAI and executed by DataMiner can interact with StorageHub through the StorageHub REST APIs. Here are some examples:

• StorageHub Facility Java
• StorageHub Facility Python

Furthermore, everything can be facilitated by using the specific input parameters as shown in the SAI wiki section Workspace Interaction by Item Id.

R Client

An R client implementing the above function is available here