NIFI-16159 Add support for FileResourceService in PutFile

[shubhluck]

Summary

NIFI-16159

Add support for FileResourceService in PutFile, matching the Resource Transfer Source / File Resource Service pattern already available in PutS3Object (NIFI-12642), PutGCSObject (NIFI-12643), and PutHDFS (NIFI-12801).

PutFile currently writes only the incoming FlowFile's content to the destination directory. Users who want to stage a file already on the local filesystem (or reachable via a custom FileResourceService implementation) have to first pull it into a FlowFile with FetchFile/GetFile, which is wasteful for large local files.

Changes

• Add Resource Transfer Source and File Resource Service property descriptors to PutFile, reusing ResourceTransferProperties from nifi-resource-transfer.
• When Resource Transfer Source = File Resource Service, obtain a FileResource via ResourceTransferUtils.getFileResource(...) and stream its InputStream to the .<filename> temp file with StandardCopyOption.REPLACE_EXISTING (preserving the overwrite semantics of the original session.exportTo(...) call), then proceed with the existing rename / permissions / owner / group / lastModified logic.
• When Resource Transfer Source = FlowFile Content (default) the behavior is byte-identical to today.
• Add nifi-resource-transfer and nifi-file-resource-service-api (compile) and nifi-file-resource-service (test) to nifi-standard-processors/pom.xml.
• Add TestPutFile#testPutFileFromLocalFile covering the FileResourceService path using StandardFileResourceService.

Backward compatibility

Resource Transfer Source defaults to FlowFile Content, so existing flows are unaffected. File Resource Service only appears in the UI when the source is set to File Resource Service (declared via dependsOn).

Tracking

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Issue Tracking

• Apache NiFi Jira issue created

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Build

• Build completed using ./mvnw clean install -P contrib-check
  • JDK 21
  • JDK 25

Licensing

• New dependencies are compatible with the Apache License 2.0 according to the License Policy
• New dependencies are documented in applicable LICENSE and NOTICE files

Documentation

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