Add STDIN support to wp media import

[Copilot]

Plan: Add STDIN support to wp media import

• Understand current implementation
• Implement STDIN support
• Add tests
• Validate implementation
  • Run linter
  • Run code style checks
  • Run PHPStan
  • Run code review
  • Run security check
• Address test failures
  • Fix file type detection using mime_content_type() instead of wp_check_filetype_and_ext()
  • Add check for empty STDIN content
  • Map MIME types to proper file extensions using wp_get_mime_types()

Changes for Test Fixes

The tests were failing because:

1. WordPress's wp_check_filetype_and_ext() was rejecting files without proper filename extensions
2. Empty STDIN was being processed by WordPress instead of being caught early

Fixed by:

• Using mime_content_type() to detect actual file MIME type from content
• Mapping MIME type to proper extension using WordPress's wp_get_mime_types()
• Adding check for empty STDIN content with proper error message
• Generating filename with correct extension (e.g., stdin-{timestamp}.png)

Original prompt

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This section details on the original issue you should resolve

<issue_title>wp media import to be able to import from STDIN</issue_title>
<issue_description>For example:

$ curl http://example.com/large-file.png | wp media import -

Related:
wp-cli/entity-command#96</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes wp media import to be able to import from STDIN #50

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[swissspidy]

@copilot failing tests:

001 Scenario: Import media from STDIN                                                                    # features/media-import.feature:290
      When I run `cat {CACHE_DIR}/codeispoetry.png | wp media import - --title="From STDIN" --porcelain` # features/media-import.feature:295
        $ cat /tmp/wp-cli-test-cache/codeispoetry.png | wp media import - --title="From STDIN" --porcelain
        
        Warning: Unable to import file 'STDIN'. Reason: Sorry, this file type is not permitted for security reasons.
        cwd: /tmp/wp-cli-test-run--6990f6b8c9f091.32634377/
        run time: 0.24478697776794
        exit status: 1 (RuntimeException)

002 Scenario: Import media from STDIN with file_name                                                         # features/media-import.feature:304
      When I run `cat {CACHE_DIR}/codeispoetry.png | wp media import - --file_name=my-image.png --porcelain` # features/media-import.feature:309
        $ cat /tmp/wp-cli-test-cache/codeispoetry.png | wp media import - --file_name=my-image.png --porcelain
        
        Warning: Unable to import file 'STDIN'. Reason: Sorry, this file type is not permitted for security reasons.
        cwd: /tmp/wp-cli-test-run--6990f6ba122d80.59454036/
        run time: 0.2444121837616
        exit status: 1 (RuntimeException)

003 Scenario: Fail to import from STDIN when no input provided # features/media-import.feature:319
      Then STDERR should contain:                              # features/media-import.feature:321
        $ wp media import - </dev/null
        
        Warning: Unable to import file 'STDIN'. Reason: File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini or by post_max_size being defined as smaller than upload_max_filesize in php.ini.
        Error: No items imported.
        cwd: /tmp/wp-cli-test-run--6990f6ba7c4d19.58308543/
        run time: 0.24285101890564
        exit status: 1
        
        --- Expected
        +++ Actual
        @@ @@
        -Warning: Unable to import file from STDIN. Reason: No input provided.
        +Warning: Unable to import file 'STDIN'. Reason: File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini or by post_max_size being defined as smaller than upload_max_filesize in php.ini.
        +Error: No items imported.

[Copilot]

@copilot failing tests:

...

Fixed in commit 560ac7a. The issue was that WordPress's file validation was rejecting files without proper extensions. Now using mime_content_type() to detect the actual MIME type from content and mapping it to the correct extension via wp_get_mime_types(). Also added check for empty STDIN content to provide the expected error message.