CKFinder 3 – ASP.NET Connector Documentation
Commands

Table of Contents

CKFinder commands behave just like controllers. They wrap the logic required to handle a request and produce an appropriate response (in CKFinder usually a JSON). Commands are resolved based on the command URL parameter.

Each command must implement the ICommand interface.

Dependencies are injected into the constructor when the command is needed.

The heart of each command class is its ExecuteAsync method where all the processing occurs.

Defining Permissions

Executing each of CKFinder commands requires appropriate permissions set in ACL configuration settings. Permissions required by a command may be verified with the IRequestAcl interface:

using System.Threading;
using System.Threading.Tasks;
using CKSource.CKFinder.Connector.Core.Acl;
using CKSource.CKFinder.Connector.Core.Commands;
using CKSource.CKFinder.Connector.Core.Nodes;
using CKSource.CKFinder.Connector.Core.Resources;
public class SomeCommand : ICommand
{
private readonly IRequestAcl _requestAcl;
private readonly IResourceTypeRepository _resourceRepository;
private readonly INodeFactory _nodeFactory;
public SomeCommand(IRequestAcl requestAcl, IResourceTypeRepository resourceRepository, INodeFactory nodeFactory)
{
_requestAcl = requestAcl;
_resourceRepository = resourceRepository;
_nodeFactory = nodeFactory;
}
public async Task<CommandResponse> ExecuteAsync(CancellationToken cancellationToken)
{
var resource = await _resourceRepository.GetByNameAsync("Resource name", cancellationToken);
var folder = _nodeFactory.CreateFolder(resource, "/path/to/folder");
_requestAcl.RequirePermission(folder, Permission.FolderView);
return new StringCommandResponse("Everything OK!");
}
}

Altering Existing Commands

All existing CKFinder commands can be altered using the events system (for example to add additional information or to change the default JSON response). Please refer to the Events article for more detailed information.

In some cases it may be useful to alter the command parameters passed from CKFinder to the server-side connector. For an example how to do that, please check the AlterCommand plugin in the CKFinder 3 Sample JavaScript Plugins repository.

Creating Custom Commands

Custom CKFinder commands can be injected into the connector. Refer to the Custom Commands section of the HOWTO for more information.

It may also be useful to have a look at the ImageInfo plugin in the CKFinder 3 Sample JavaScript Plugins repository to check out how to request commands from a JavaScript plugin. You can find more information in the Sending Command to the Server section of the CKFinder 3 JavaScript Documentation.

List of CKFinder Commands

Common URL Parameters

Name Description
command The name of the command to execute.
type The resource type name.
currentFolder The current working folder path.

CopyFiles

Description Copies files from selected folders.
Method POST
Sample request

Copy two files from the sub1 directory of the Files resource type to the root (/) directory of the Images resource type.

Example of the files parameter structure (JSON notation):

request["files"] = [
{
"name": "file1.jpg",
"type": "Files",
"folder": "/sub1/"
"options": ""
},
{
"name": "file2.png",
"type": "Files",
"folder": "/sub1/"
"options": ""
}
]
/ckfinder/connector?command=CopyFiles&type=Images&currentFolder=/
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/images/",
"acl": 255
},
"copied": 2
}
Notes The request should contain an array parameter named files with elements defining source files to be copied. Each array element should contain the following parameters:
  • name – The file name.
  • type – The file resource type.
  • folder – The file folder.
  • options – A parameter that defines the way the file should be copied if a file with the same name already exists in the target folder. The option parameter can contain the following values:
    • By default it is an empty string and in this case an appropriate error will be added to the response if the file already exists.
    • overwrite – The target file is overwritten.
    • autorename – In this case the name of the copied file is altered by adding a number to the file name, for example file.txt after automatic renaming is file(1).txt.

CreateFolder

Description Creates a child folder.
Method POST
Sample request

Create the My Folder folder in the root (/) folder of the Files resource type:

/ckfinder/connector?command=CreateFolder&type=Files&currentFolder=/&newFolderName=My Folder
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"newFolder": "My Folder",
"created": 1
}

DeleteFiles

Description Deletes given files.
Method POST
Sample request

Delete two files from the sub1 directory of the Files resource type.

Example of the files parameter structure (JSON notation):

request["files"] = [
{
"name": "file1.jpg",
"type": "Files",
"folder": "/sub1/"
},
{
"name": "file2.png",
"type": "Files",
"folder": "/sub1/"
}
]
/ckfinder/connector?command=DeleteFiles&type=Files&currentFolder=/
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"deleted": 2
}
Notes The request should contain an array parameter named files with elements defining source files to be deleted. Each array element should contain the following parameters:
  • name – The file name.
  • type – The file resource type.
  • folder – The file folder.

DeleteFolder

Description Deletes a given folder.
Method POST
Sample request

Delete the sub1 directory of the Files resource type:

/ckfinder/connector?command=DeleteFolder&type=Files&currentFolder=/sub1/
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/sub1/",
"url": "/ckfinder/userfiles/files/sub1/",
"acl": 255
},
"deleted": 1
}

DownloadFile

Description Downloads a file from the server.
Method GET
Sample request

Download the file named Test.jpg from the root (/) directory of the Files resource type:

/ckfinder/connector?command=DownloadFile&type=Files&currentFolder=/&fileName=Test.jpg
Notes This command does not expect the connector to return a text response. Instead, it must stream the file data to the client.

FileUpload

Description Uploads a file to a given folder.
Method POST
Sample request

Upload a file to the root (/) directory of the Files resource type:

/ckfinder/connector?command=FileUpload&type=Files&currentFolder=/
Sample response

{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"fileName": "fileName.jpg",
"uploaded": 1
}
Notes
  • File data should be encoded as multipart/form-data.
  • The POST parameter containing the uploaded file should be named upload.
  • Uploaded file names may contain non-ASCII characters.

GetFiles

Description Returns the list of files for a given folder.
Method GET
Sample request Get the list of files inside the /Docs/ folder of the Images resource type:
/ckfinder/connector?command=GetFiles&type=Images&currentFolder=/Docs/
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/Docs/",
"url": "/ckfinder/userfiles/images/Docs/",
"acl": 255
},
"files": [
{
"name": "image1.png",
"date": "201406080924",
"size": 1
},
{
"name": "測試.png",
"date": "201406080924",
"size": 12
}
]
}
Notes

File names may contain non-ASCII characters, like in the example above with Chinese characters.

The date attribute corresponds to the time of the last file modification in the format of YYYYMMDDHHmm, where:

  • YYYY – The year (4 digits).
  • MM – The month (2 digits with padding zero).
  • DD – The day (2 digits with padding zero).
  • HH – The hour (24-hour format, 2 digits with padding zero).
  • mm – The minute (2 digits with padding zero).

The size attribute contains the file size in kilobytes.

GetFileUrl

Description Returns a direct URL to a file.
Method GET
Sample request Get a direct URL to a file named longcat.jpg stored in the /kittens/ folder of the Images resource type:
/ckfinder/connector?command=GetFileUrl&type=Images&currentFolder=/kittens/&fileName=longcat.jpg
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/kittens/",
"url": "/ckfinder/userfiles/images/kittens/",
"acl": 255
},
"url": "/ckfinder/userfiles/images/kittens/longcat.jpg"
}
Notes The URL returned by this command depends on the backend defined for a resource type. In most cases it is required to define a baseUrl for a backend to be able to obtain valid direct URLs to files.

GetFolders

Description Returns the list of child folders for a given folder.
Method GET
Sample request Get child folders inside the /Docs/ folder of the Images resource type.
/ckfinder/connector?command=GetFolders&type=Images&currentFolder=/Docs/
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/Docs/",
"url": "/ckfinder/userfiles/images/Docs/",
"acl": 255
},
"folders": [
{
"name": "folder1",
"hasChildren": false,
"acl": 255
},
{
"name": "繁體中文字",
"hasChildren": false,
"acl": 255
}
]
}
Notes Folder names may contain non-ASCII characters, like in the example above with Chinese characters.

GetResizedImages

Description Returns a list of resized versions of the image file.
Method GET
Sample request Get resized versions of the longcat.jpg image that is stored in the /kittens/ folder of the Images resource type:
/ckfinder/connector?command=GetResizedImages&type=Images&currentFolder=/kittens/&fileName=longcat.jpg
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/kittens/",
"url": "/ckfinder/userfiles/images/kittens/",
"acl": 255
},
"originalSize":"1920x1200",
"resized": {
"small": "longcat__480x300.jpg",
"medium": "longcat__600x375.jpg",
"large": "longcat__800x500.jpg",
"__custom": ["longcat__200x125.jpg", "longcat__300x188.jpg"]
}
}
Notes The resized versions of images always preserve the aspect ratio of the original. When a resized version of the image matches any size defined in the images.sizes configuration option, it is appended under an appropriate key in the response (like small, medium, large in the example above). All other existing resized versions are stored under the key named __custom.

ImageEdit

Description Performs basic image modifications: crop, rotate, resize.
Method POST
Sample request

Actions to perform together with required parameters are sent in the actions array parameter.

An example of the actions parameter structure (JSON notation):

request["actions"] = [
{
"action": "rotate",
"angle": 90 // Number of degrees for clockwise rotation.
},
{
"action": "resize",
"width": 300, // Maximum image width.
"height": 300 // Maximum image height.
},
{
"action": "crop",
"x": 0, // X coordinate of the top-left corner of the cropped area.
"y": 0, // Y coordinate of the top-left corner of the cropped area.
"width": 225, // The cropped area width.
"height": 150 // The cropped area height.
}
]

Depending on whether the newFileName parameter was provided or not:

  • If provided, a new file with a given name is created.
  • If omitted, the current file is replaced.
/ckfinder/connector?command=ImageEdit&type=Images&currentFolder=/kittens/&fileName=longcat.jpg
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/kittens/",
"url": "/ckfinder/userfiles/images/kittens/",
"acl": 255
},
"saved": 1
}

ImageInfo

Description Returns information about the dimensions of the image file.
Method GET
Sample request

Get dimensions of the longcat.jpg image that is stored in the /kittens/ folder of the Images resource type.

/ckfinder/connector?command=ImageInfo&type=Images&currentFolder=/kittens/&fileName=longcat.jpg
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/kittens/",
"url": "/ckfinder/userfiles/images/kittens/",
"acl": 255
},
"width": 1440,
"height": 900
}

ImagePreview

Description Creates a resized version of the image file.
Method GET
Sample request

Create a resized version of the longcat.jpg image that is stored in the /kittens/ folder of the Images resource type. Resize it to 450x450:

/ckfinder/connector?command=ImagePreview&type=Images&currentFolder=/kittens/&fileName=longcat.jpg&size=450x450
Sample response This command does not expect the connector to return a text response. Instead, it must stream the image data to the client.
Notes

Returned images always preserve the aspect ratio of the original (using the higher scaling factor calculated for borders). Requested size is corrected when its aspect ratio does not match the aspect ratio of the original image.

Images generated with this command are not stored on the server side.

ImageResize

Description Creates a resized version of the image file.
Method POST
Sample request

Create a resized version of the longcat.jpg image that is stored in the /kittens/ folder of the Images resource type. Resize it to 450x450:

/ckfinder/connector?command=ImageResize&type=Images&currentFolder=/kittens/&fileName=longcat.jpg&size=450x450
Sample response
{
"resourceType": "Images",
"currentFolder": {
"path": "/kittens/",
"url": "/ckfinder/userfiles/images/kittens/",
"acl": 255
},
"url":"/ckfinder/userfiles/images/kittens/__thumbs/longcat.jpg/longcat__450x281.jpg" // Direct URL to a file
}
Notes

Returned images always preserve the aspect ratio of the original (using the lower scaling factor calculated for borders). Requested size is corrected when its aspect ratio does not match the aspect ratio of the original image.

Images generated with this command are stored in a special folder named __thumbs created in the current file folder.

Init

Description This is the first command issued by CKFinder. It returns the general settings of the connector and all configured resource types.
Method GET
Sample request
/ckfinder/connector?command=Init
Sample response
{
"enabled": true,
"s": "",
"c": "",
"thumbs": ["150x150", "300x300", "500x500"],
"images":{"max":"500x400","sizes":{"small":"480x320","medium":"600x480","large":"800x600"}},
"uploadMaxSize": "425167",
"uploadCheckImages": true,
"resourceTypes": [
{
"name": "Files",
"url": "/ckfinder/userfiles/files",
"allowedExtensions": "7z,aiff,asf,avi,bmp,csv,doc,docx,fla,flv,gif,gz,gzip,jpeg,zip",
"deniedExtensions": "",
"hash": "8b787e3ea25b5079",
"hasChildren": false,
"acl": 1023,
"maxSize": 32768
},
{
"name": "Images",
"url": "/ckfinder/userfiles/images",
"allowedExtensions": "bmp,gif,jpeg,jpg,png",
"deniedExtensions": "",
"hash": "b8de0a3f3cb3cd1f",
"hasChildren": false,
"acl": 1023,
"maxSize": 65536
}
]
}

MoveFiles

Description Moves files from selected folders.
Method POST
Sample request

Move two files from the sub1 directory of the Files resource type to the root (/) directory of the Images resource type.

Example of the files parameter structure (JSON notation):

request["files"] = [
{
"name": "file1.jpg",
"type": "Files",
"folder": "/sub1/"
"options": ""
},
{
"name": "file2.png",
"type": "Files",
"folder": "/sub1/"
"options": ""
}
]
/ckfinder/connector?command=MoveFiles&type=Files&currentFolder=/
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"moved": 2
}
Notes The request should contain an array parameter named files with elements defining source files to be moved. Each array element should contain the following parameters:
  • name – The file name.
  • type – The file resource type.
  • folder – The file folder.
  • options – A parameter that defines the way the file should be moved when a file with the same name already exists in the target folder. The option parameter can contain the following values:
    • By default it is an empty string and in this case an appropriate error will be added to the response when the file already exists.
    • overwrite – The target file is overwritten.
    • autorename – In this case the name of the moved file is altered by adding a number to the file name, for example file.txt after automatic renaming is file(1).txt.

Operation

Since
CKFinder 3.1.0
Description Tracks the progress of the operation in time-consuming connector commands.
Method GET
Sample request

Progress tracking can be started for a time-consuming command by passing an additional parameter named operationId:

/ckfinder/connector?command=RenameFolder&type=Files&currentFolder=/foo/&newFolderName=bar&operationId=i52q7a7db83rz3n6

The operationId is a unique operation identifier that should match the following regular expression: ^[a-z0-9]{16}.

The status of the operation can be then periodically checked with a request to the Operation command:

/ckfinder/connector?command=Operation&operationId=i52q7a7db83rz3n6
Sample response
{
"total": 291,
"current": 128
}
Notes

Not all commands support operation tracking and this feature may depend on the storage type defined for a backend.

This command may use the following optional parameters:

  • abort – If this Boolean parameter is present, the time-consuming operation will be immediately aborted.

Proxy

Since
CKFinder 3.1.0
Description

Serves a file to the browser without forcing the download. This command is useful in cases where you want to use files without direct access on a web page. These may be files stored on a backend like a private FTP server, or files that are not in the web server root folder. If the backend is defined as a Proxy, all links generated by CKFinder will be pointing to the Proxy command.

Note: If you decide to use this option, all links generated by CKFinder will be pointing to the Proxy command, and will be dependent on the CKFinder connector to work properly.

Method GET
Sample request
/ckfinder/connector?command=Proxy&type=Files&currentFolder=/&fileName=foo.jpg
Sample response This command does not expect the connector to return a text response. Instead, it must stream the file data to the client.
Notes This command may use the following optional parameters:
  • cache – An integer value defining the cache lifetime in seconds (this corresponds to Expires and Cache-Control response headers). See the configuration.
  • thumbnail – The name of the public thumbnail file, if a resized version of the image should be served.

QuickUpload

Description Uploads a file to the given folder. This command is very similar to FileUpload and it is used to handle uploads from the CKEditor Image or Link dialog.
Method POST
Sample request

This command accepts an additional URL parameter called responseType that defines the format of the returned response.

Upload a file to the root (/) directory of the Files resource type:

/ckfinder/connector?command=FileUpload&type=Files&currentFolder=/
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"fileName": "fileName.jpg",
"uploaded": 1
}
Notes
  • File data should be encoded as multipart/form-data.
  • The POST parameter containing the uploaded file should be named upload.
  • Uploaded file names may contain non-ASCII characters.

RenameFile

Description Renames a file.
Method POST
Sample request

Rename the file foo.jpg to bar.jpg in the sub1 directory of the Files resource type:

/ckfinder/connector?command=RenameFile&type=Files&currentFolder=/sub1/&fileName=foo.jpg&newFileName=bar.jpg
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/sub1/",
"url": "/ckfinder/userfiles/files/sub1/",
"acl": 255
},
"name": "foo.jpg",
"newName":"bar.jpg",
"renamed": 1
}

RenameFolder

Description Renames a folder.
Method POST
Sample request

Rename the sub1 folder to sub1_renamed in the Files resource type:

/ckfinder/connector?command=RenameFolder&type=Files&currentFolder=/sub1/&newFolderName=sub1_renamed
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/sub1/",
"url": "/ckfinder/userfiles/files/sub1/",
"acl": 255
},
"newName": "sub1_renamed",
"newPath": "/sub1_renamed/",
"renamed": 1
}

SaveImage

Description Saves a Base64-encoded PNG image to a file.
Method POST
Sample request

Save the Base64-encoded image sent in the content parameter as the Test.jpg file in the root (/) directory of the Files resource type:

/ckfinder/connector?command=SaveImage&type=Files&currentFolder=/&fileName=Test.jpg
Sample response
{
"resourceType": "Files",
"currentFolder": {
"path": "/",
"url": "/ckfinder/userfiles/files/",
"acl": 255
},
"saved": 1,
"date": "201406080924",
"size": 1
}

Thumbnail

Description Downloads the thumbnail of an image file.
Method GET
Sample request

Download the thumbnail of the file named Test.jpg from the root (/) directory of the Files resource type:

/ckfinder/connector?command=Thumbnail&type=Files&currentFolder=/&fileName=Test.jpg&size=150x150
Response This command does not expect the connector to return a text response. Instead, it must stream the thumbnail file data to the browser.
Notes

The size parameter can be used to control the size of the returned thumbnail image. By default the CKFinder 3 for ASP.NET connector supports the following thumbnail sizes:

  • 150x150
  • 300x300
  • 500x500

Default sizes can be overwritten in the main configuration file.