SCP

Since Camel 2.10

Only producer is supported

The Camel-Jsch component supports the SCP protocol using the Client API of the Jsch project. Jsch is already used in camel by the FTP component for the sftp: protocol.

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

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

URI format

scp://host[:port]/destination[?options]

The file name can be specified either in the <path> part of the URI or as a "CamelFileName" header on the message (Exchange.FILE_NAME if used in code).

Configuring Options

Camel components are configured on two separate levels:

  • component level

  • endpoint level

Configuring Component Options

The component level is the highest level which holds general and common configurations that are inherited by the endpoints. For example a component may have security settings, credentials for authentication, urls for network connection and so forth.

Some components only have a few options, and others may have many. Because components typically have pre configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all.

Configuring components can be done with the Component DSL, in a configuration file (application.properties|yaml), or directly with Java code.

Configuring Endpoint Options

Where you find yourself configuring the most is on endpoints, as endpoints often have many options, which allows you to configure what you need the endpoint to do. The options are also categorized into whether the endpoint is used as consumer (from) or as a producer (to), or used for both.

Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL as a type safe way of configuring endpoints.

A good practice when configuring options is to use Property Placeholders, which allows to not hardcode urls, port numbers, sensitive information, and other settings. In other words placeholders allows to externalize the configuration from your code, and gives more flexibility and reuse.

The following two sections lists all the options, firstly for the component followed by the endpoint.

Component Options

The SCP component supports 3 options, which are listed below.

Name Description Default Type

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

verboseLogging (producer)

JSCH is verbose logging out of the box. Therefore we turn the logging down to DEBUG logging by default. But setting this option to true turns on the verbose logging again.

boolean

autowiredEnabled (advanced)

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

boolean

Endpoint Options

The SCP endpoint is configured using URI syntax:

scp:host:port/directoryName

with the following path and query parameters:

Path Parameters (3 parameters)

Name Description Default Type

host (producer)

Required Hostname of the FTP server.

String

port (producer)

Port of the FTP server.

int

directoryName (producer)

The starting directory.

String

Query Parameters (23 parameters)

Name Description Default Type

chmod (producer)

Allows you to set chmod on the stored file. For example chmod=664.

String

disconnect (common)

Whether or not to disconnect from remote FTP server right after use. Disconnect will only disconnect the current connection to the FTP server. If you have a consumer which you want to stop, then you need to stop the consumer/route instead.

boolean

fileName (producer)

Use Expression such as File Language to dynamically set the filename. For consumers, it’s used as a filename filter. For producers, it’s used to evaluate the filename to write. If an expression is set, it take precedence over the CamelFileName header. (Note: The header itself can also be an Expression). The expression options support both String and Expression types. If the expression is a String type, it is always evaluated using the File Language. If the expression is an Expression type, the specified Expression type is used - this allows you, for instance, to use OGNL expressions. For the consumer, you can use it to filter filenames, so you can for instance consume today’s file using the File Language syntax: mydata-$\{date:now:yyyyMMdd}.txt. The producers support the CamelOverruleFileName header which takes precedence over any existing CamelFileName header; the CamelOverruleFileName is a header that is used only once, and makes it easier as this avoids to temporary store CamelFileName and have to restore it afterwards.

String

flatten (producer)

Flatten is used to flatten the file name path to strip any leading paths, so it’s just the file name. This allows you to consume recursively into sub-directories, but when you eg write the files to another directory they will be written in a single directory. Setting this to true on the producer enforces that any file name in CamelFileName header will be stripped for any leading paths.

boolean

jailStartingDirectory (producer)

Used for jailing (restricting) writing files to the starting directory (and sub) only. This is enabled by default to not allow Camel to write files to outside directories (to be more secured out of the box). You can turn this off to allow writing files to directories outside the starting directory, such as parent or root folders.

boolean

lazyStartProducer (producer)

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

boolean

strictHostKeyChecking (producer)

Sets whether to use strict host key checking. Possible values are: no, yes.

Enum values:

  • no

  • yes

String

allowNullBody (producer (advanced))

Used to specify if a null body is allowed during file writing. If set to true then an empty file will be created, when set to false, and attempting to send a null body to the file component, a GenericFileWriteException of 'Cannot write null body to file.' will be thrown. If the fileExist option is set to 'Override', then the file will be truncated, and if set to append the file will remain unchanged.

boolean

disconnectOnBatchComplete (producer (advanced))

Whether or not to disconnect from remote FTP server right after a Batch upload is complete. disconnectOnBatchComplete will only disconnect the current connection to the FTP server.

boolean

moveExistingFileStrategy (producer (advanced))

Strategy (Custom Strategy) used to move file with special naming token to use when fileExist=Move is configured. By default, there is an implementation used if no custom strategy is provided.

FileMoveExistingStrategy

connectTimeout (advanced)

Sets the connect timeout for waiting for a connection to be established Used by both FTPClient and JSCH.

int

soTimeout (advanced)

Sets the so timeout FTP and FTPS Only for Camel 2.4. SFTP for Camel 2.14.3/2.15.3/2.16 onwards. Is the SocketOptions.SO_TIMEOUT value in millis. Recommended option is to set this to 300000 so as not have a hanged connection. On SFTP this option is set as timeout on the JSCH Session instance.

int

synchronous (advanced)

Sets whether synchronous processing should be strictly used.

boolean

timeout (advanced)

Sets the data timeout for waiting for reply Used only by FTPClient.

int

knownHostsFile (security)

Sets the known_hosts file, so that the jsch endpoint can do host key verification. You can prefix with classpath: to load the file from classpath instead of file system.

String

password (security)

Password to use for login.

String

preferredAuthentications (security)

Set a comma separated list of authentications that will be used in order of preference. Possible authentication methods are defined by JCraft JSCH. Some examples include: gssapi-with-mic,publickey,keyboard-interactive,password If not specified the JSCH and/or system defaults will be used.

String

privateKeyBytes (security)

Set the private key bytes to that the endpoint can do private key verification. This must be used only if privateKeyFile wasn’t set. Otherwise the file will have the priority.

byte[]

privateKeyFile (security)

Set the private key file to that the endpoint can do private key verification. You can prefix with classpath: to load the file from classpath instead of file system.

String

privateKeyFilePassphrase (security)

Set the private key file passphrase to that the endpoint can do private key verification.

String

username (security)

Username to use for login.

String

useUserKnownHostsFile (security)

If knownHostFile has not been explicit configured, then use the host file from System.getProperty(user.home) /.ssh/known_hosts.

boolean

ciphers (security (advanced))

Set a comma separated list of ciphers that will be used in order of preference. Possible cipher names are defined by JCraft JSCH. Some examples include: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc,aes192-cbc,aes256-cbc. If not specified the default list from JSCH will be used.

String

Limitations

Currently camel-jsch only supports a Producer (i.e. copy files to another host).

Spring Boot Auto-Configuration

When using scp with Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

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

The component supports 4 options, which are listed below.

Name Description Default Type

camel.component.scp.autowired-enabled

Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc.

true

Boolean

camel.component.scp.enabled

Whether to enable auto configuration of the scp component. This is enabled by default.

Boolean

camel.component.scp.lazy-start-producer

Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel’s routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing.

false

Boolean

camel.component.scp.verbose-logging

JSCH is verbose logging out of the box. Therefore we turn the logging down to DEBUG logging by default. But setting this option to true turns on the verbose logging again.

false

Boolean