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Chapter 90. Dropbox Component

Available as of Camel version 2.14

The dropbox: component allows you to treat Dropbox remote folders as a producer or consumer of messages. Using the Dropbox Java Core API (reference version for this component is 1.7.x), this camel component has the following features:

  • As a consumer, download files and search files by queries
  • As a producer, download files, move files between remote directories, delete files/dir, upload files and search files by queries

Maven users will need to add the following dependency to their pom.xml for this component: 

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-dropbox</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

90.1. URI format

dropbox://[operation]?[options]

Where operation is the specific action (typically is a CRUD action) to perform on Dropbox remote folder.

90.2. Operations

OperationDescription

del

deletes files or directories on Dropbox

get

download files from Dropbox

move

move files from folders on Dropbox

put

upload files on Dropbox

search

search files on Dropbox based on string queries

Operations require additional options to work, some are mandatory for the specific operation.

90.3. Options

In order to work with Dropbox API you need to obtain an accessToken and a clientIdentifier.
You can refer to the Dropbox documentation that explains how to get them.

The Dropbox component has no options.

The Dropbox endpoint is configured using URI syntax: 

dropbox:operation

with the following path and query parameters:

90.3.1. Path Parameters (1 parameters):

NameDescriptionDefaultType

operation

Required The specific action (typically is a CRUD action) to perform on Dropbox remote folder.

 

DropboxOperation

90.3.2. Query Parameters (12 parameters):

NameDescriptionDefaultType

accessToken (common)

Required The access token to make API requests for a specific Dropbox user

 

String

client (common)

To use an existing DbxClient instance as DropBox client.

 

DbxClientV2

clientIdentifier (common)

Name of the app registered to make API requests

 

String

localPath (common)

Optional folder or file to upload on Dropbox from the local filesystem. If this option has not been configured then the message body is used as the content to upload.

 

String

newRemotePath (common)

Destination file or folder

 

String

query (common)

A space-separated list of sub-strings to search for. A file matches only if it contains all the sub-strings. If this option is not set, all files will be matched.

 

String

remotePath (common)

Original file or folder to move

 

String

uploadMode (common)

Which mode to upload. in case of add the new file will be renamed if a file with the same name already exists on dropbox. in case of force if a file with the same name already exists on dropbox, this will be overwritten.

 

DropboxUploadMode

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

 

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange.

 

ExchangePattern

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

90.4. Spring Boot Auto-Configuration

The component supports 2 options, which are listed below.

NameDescriptionDefaultType

camel.component.dropbox.enabled

Enable dropbox component

true

Boolean

camel.component.dropbox.resolve-property-placeholders

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

Boolean

90.5. Del operation

Delete files on Dropbox.

Works only as Camel producer.

Below are listed the options for this operation:

PropertyMandatoryDescription

remotePath

true

Folder or file to delete on Dropbox

90.5.1. Samples

from("direct:start")
  .to("dropbox://del?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1")
  .to("mock:result");

from("direct:start")
  .to("dropbox://del?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1/file1.tar.gz")
  .to("mock:result");

90.5.2. Result Message Headers

The following headers are set on message result:

PropertyValue

DELETED_PATH

name of the path deleted on dropbox

90.5.3. Result Message Body

The following objects are set on message body result:

Object typeDescription

String

name of the path deleted on dropbox

90.6. Get (download) operation

Download files from Dropbox.

Works as Camel producer or Camel consumer.

Below are listed the options for this operation:

PropertyMandatoryDescription

remotePath

true

Folder or file to download from Dropbox

90.6.1. Samples

from("direct:start")
  .to("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1/file1.tar.gz")
  .to("file:///home/kermit/?fileName=file1.tar.gz");

from("direct:start")
  .to("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1")
  .to("mock:result");

from("dropbox://get?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1")
  .to("file:///home/kermit/");

90.6.2. Result Message Headers

The following headers are set on message result:

PropertyValue

DOWNLOADED_FILE

in case of single file download, path of the remote file downloaded

DOWNLOADED_FILES

in case of multiple files download, path of the remote files downloaded

90.6.3. Result Message Body

The following objects are set on message body result:

Object typeDescription

ByteArrayOutputStream

in case of single file download, stream representing the file downloaded

Map<String, ByteArrayOutputStream>

in case of multiple files download, a map with as key the path of the remote file downloaded and as value the stream representing the file downloaded

90.7. Move operation

Move files on Dropbox between one folder to another.

Works only as Camel producer.

Below are listed the options for this operation:

PropertyMandatoryDescription

remotePath

true

Original file or folder to move

newRemotePath

true

Destination file or folder

90.7.1. Samples

from("direct:start")
  .to("dropbox://move?accessToken=XXX&clientIdentifier=XXX&remotePath=/root/folder1&newRemotePath=/root/folder2")
  .to("mock:result");

90.7.2. Result Message Headers

The following headers are set on message result:

PropertyValue

MOVED_PATH

name of the path moved on dropbox

90.7.3. Result Message Body

The following objects are set on message body result:

Object typeDescription

String

name of the path moved on dropbox

90.8. Put (upload) operation

Upload files on Dropbox.

Works as Camel producer.

Below are listed the options for this operation:

PropertyMandatoryDescription

uploadMode

true

add or force this option specifies how a file should be saved on dropbox: in case of "add" the new file will be renamed if a file with the same name already exists on dropbox. In case of "force" if a file with the same name already exists on dropbox, this will be overwritten.

localPath

false

Folder or file to upload on Dropbox from the local filesystem. If this option has been configured then it takes precedence over uploading as a single file with content from the Camel message body (message body is converted into a byte array).

remotePath

false

Folder destination on Dropbox. If the property is not set, the component will upload the file on a remote path equal to the local path. With Windows or without an absolute localPath you may run into an exception like the following:

Caused by: java.lang.IllegalArgumentException: 'path': bad path: must start with "/": "C:/My/File"
OR
Caused by: java.lang.IllegalArgumentException: 'path': bad path: must start with "/": "MyFile"

90.8.1. Samples

from("direct:start").to("dropbox://put?accessToken=XXX&clientIdentifier=XXX&uploadMode=add&localPath=/root/folder1")
  .to("mock:result");

from("direct:start").to("dropbox://put?accessToken=XXX&clientIdentifier=XXX&uploadMode=add&localPath=/root/folder1&remotePath=/root/folder2")
  .to("mock:result");

And to upload a single file with content from the message body 

from("direct:start")
   .setHeader(DropboxConstants.HEADER_PUT_FILE_NAME, constant("myfile.txt"))
   .to("dropbox://put?accessToken=XXX&clientIdentifier=XXX&uploadMode=add&remotePath=/root/folder2")
   .to("mock:result");

The name of the file can be provided in the header DropboxConstants.HEADER_PUT_FILE_NAME or Exchange.FILE_NAME in that order of precedence. If no header has been provided then the message id (uuid) is used as the file name.

90.8.2. Result Message Headers

The following headers are set on message result:

PropertyValue

UPLOADED_FILE

in case of single file upload, path of the remote path uploaded

UPLOADED_FILES

in case of multiple files upload, string with the remote paths uploaded

90.8.3. Result Message Body

The following objects are set on message body result:

Object typeDescription

String

in case of single file upload, result of the upload operation, OK or KO

Map<String, DropboxResultCode>

in case of multiple files upload, a map with as key the path of the remote file uploaded and as value the result of the upload operation, OK or KO

90.9. Search operation

Search inside a remote Dropbox folder including its sub directories.

Works as Camel producer and as Camel consumer.

Below are listed the options for this operation:

PropertyMandatoryDescription

remotePath

true

Folder on Dropbox where to search in.

query

true

A space-separated list of sub-strings to search for. A file matches only if it contains all the sub-strings. If this option is not set, all files will be matched. The query is required to be provided in either the endpoint configuration or as a header CamelDropboxQuery on the Camel message.

90.9.1. Samples

from("dropbox://search?accessToken=XXX&clientIdentifier=XXX&remotePath=/XXX&query=XXX")
  .to("mock:result");

from("direct:start")
  .setHeader("CamelDropboxQuery", constant("XXX"))
  .to("dropbox://search?accessToken=XXX&clientIdentifier=XXX&remotePath=/XXX")
  .to("mock:result");

90.9.2. Result Message Headers

The following headers are set on message result:

PropertyValue

FOUNDED_FILES

list of file path founded

90.9.3. Result Message Body

The following objects are set on message body result:

Object typeDescription

List<DbxEntry>

list of file path founded. For more information on this object refer to Dropbox documentation,

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