Using the Amazon Simple Storage Service (S3), list the keys of all objects contained in a folder or a bucket.
Input Ports
Input
This transformer accepts any feature.
Output Ports
Output
All object keys for a particular bucket, which can optionally be confined to a specific folder within that bucket, will be output through this port.
Initiator
Input features are output through this port with an additional attribute (specified by Key Count Attribute) that contains the number of listed objects.
<Rejected>
Features that generate an error are output through this port. The error messages are stored in an additional attribute specified by Error Attribute.
Parameters
AWS Credentials
Access Key ID
An access key associated with a user with permission to read data from the specified bucket. If a pairing of an access key and a secret access key is not given, credentials will be searched in various locations listed here.
- In a file titled AwsCredentials.properties located in the Java classpath
- For the properties aws.accessKeyId and aws.secretKey in the Java system properties
- In the environment variables AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
If credentials are still not found, the client will act as if it is in anonymous mode, where requests aren’t signed. This is useful if accessing a publicly accessible object or bucket.
Secret Access Key
A secret key paired with the access key provided. See the Access Key ID parameter for credential searching.
S3 Object List Options
Type
Whether to list keys of objects contained in the bucket or a specific folder within that bucket.
Bucket Name
The name of the bucket to list objects from.
Folder Name
Limit the keys returned to those of objects contained within this folder. This can also be the path to a subfolder, where folder names are delimited by a ‘/’.
Include Subfolders
Whether or not the keys of objects contained within subfolders should be listed as well.
Output Options
Target Attribute
Specify the attribute that will store the output object key.
This attribute will be present on features passing through the Output port.
Key Count Attribute
Specify the output attribute that will store the number of objects listed.
This attribute will be present on features passing through the Initiator port.
Error Attribute
Specify the output attribute that will store any messages from errors during the listing process.
This attribute will be present on features passing through the <Rejected> port.
Editing Transformer Parameters
Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click 
beside the applicable parameter. For more information, see Transformer Parameter Menu Options.
Transformer Categories
FME Licensing Level
FME Professional edition and above
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