[Fixes #13907] Support for FlatGeoBuf Remote Layers

[sijandh35]

Fixes #13907

Checklist

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[gemini-code-assist]

Summary of Changes

Hello @sijandh35, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances GeoNode's capabilities by integrating support for remote FlatGeoBuf layers. It provides a robust mechanism for GeoNode to consume and manage FlatGeoBuf data hosted externally, including validating the remote source's compatibility with HTTP Range requests and extracting essential geospatial metadata. This addition streamlines the process of incorporating FlatGeoBuf datasets into the GeoNode ecosystem, offering users more flexibility in data management.

Highlights

• FlatGeoBuf Remote Layer Support: Introduces a new handler to enable the import and management of remote FlatGeoBuf layers within GeoNode.
• Metadata Extraction via OGR: The new handler leverages OGR with VSICURL to efficiently extract spatial metadata (CRS, BBox, attributes) from remote FlatGeoBuf files using HTTP Range requests.
• Thumbnail Exclusion for FlatGeoBuf: FlatGeoBuf layers are now explicitly excluded from generating thumbnails, similar to 3D Tiles, to optimize performance and relevance.
• Comprehensive Unit Tests: New unit tests have been added to ensure the correct functionality of the FlatGeoBuf remote resource handler, covering URL validation and resource creation.

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[gemini-code-assist]

Code Review

This pull request introduces support for FlatGeobuf remote layers, enhancing GeoNode's capabilities to handle more geospatial data formats. The changes include a new handler for FlatGeobuf, updates to the base model to reflect its properties, and corresponding tests. The implementation correctly integrates FlatGeobuf into the remote resource handling workflow, including URL validation, metadata extraction, and resource creation. The test coverage for the new handler appears comprehensive, covering various scenarios for URL validation and resource creation.

[gemini-code-assist]

The range_res.close() call is correctly placed in a finally block. However, if requests.get on line 70 fails (e.g., due to a network error or timeout before a response is received), range_res might not be defined, leading to an UnboundLocalError. Consider initializing range_res = None before the try block to prevent this potential issue.

Suggested change

	finally:
	range_res.close()
	try:
	range_res = requests.get(url, headers={"Range": "bytes=0-1"}, timeout=10, stream=True)
	logger.debug(f"Range GET status: {range_res.status_code}")
	if range_res.status_code != 206:
	raise ImportException(
	"The remote server does not support HTTP Range requests, which are required for FlatGeobuf."
	)
	finally:
	if 'range_res' in locals() and range_res:
	range_res.close()

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.22%. Comparing base (6a35d7e) to head (fb4d562).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #13908      +/-   ##
==========================================
+ Coverage   74.19%   74.22%   +0.02%     
==========================================
  Files         944      949       +5     
  Lines       56468    56790     +322     
  Branches     7651     7702      +51     
==========================================
+ Hits        41899    42154     +255     
- Misses      12885    12941      +56     
- Partials     1684     1695      +11     

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