core.node.services / AttachmentStorage

# AttachmentStorage

`interface AttachmentStorage`

An attachment store records potentially large binary objects, identified by their hash. Note that attachments are immutable and can never be erased once inserted

### Functions

importAttachment | `abstract fun importAttachment(jar: InputStream): SecureHash` Inserts the given attachment into the store, does <emph>not</emph> close the input stream. This can be an intensive operation due to the need to copy the bytes to disk and hash them along the way.

openAttachment

`abstract fun openAttachment(id: SecureHash): Attachment?`

Returns a newly opened stream for the given locally stored attachment, or null if no such attachment is known. The returned stream must be closed when you are done with it to avoid resource leaks. You should probably wrap the result in a JarInputStream unless youre sending it somewhere, there is a convenience helper for this on Attachment.

### Inheritors

NodeAttachmentService | `class NodeAttachmentService : AttachmentStorage, AcceptsFileUpload` Stores attachments in the specified local directory, which must exist. Doesnt allow new attachments to be uploaded.