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fix(exiftool): remove derived tags to prevent side effects when writing metadata (fixes #1463)

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This commit is contained in:
Julien Neuhart
2026-01-29 17:25:09 +01:00
parent 45318497d2
commit f57ecb6ef2
1 changed files with 27 additions and 0 deletions
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27
pkg/modules/exiftool/exiftool.go
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@@ -134,6 +134,33 @@ func (engine *ExifTool) WriteMetadata(ctx context.Context, logger *zap.Logger, m
return fmt.Errorf("read metadata with ExitfTool: %w", fileMetadata[0].Err)
}
// Define a list of derived, system, or computed tags that ExifTool
// extracts but should never be written back. Writing these can break PDF/A
// compliance (e.g., PageCount -> prism:pageCount) or cause side effects
// (e.g., FileModifyDate).
derivedTags := []string{
"PageCount", // Causes prism:pageCount injection
"Linearized", // Computed status; writing it may invalidate structure
"PDFVersion", // Header version; should not be manually forced via metadata
"MIMEType", // Read-only derived
"FileType", // Read-only derived
"FileTypeExtension", // Read-only derived
"FileSize", // System attribute
"FileModifyDate", // System attribute
"FileAccessDate", // System attribute
"FileInodeChangeDate", // System attribute
"FilePermissions", // System attribute
"FileName", // Writing this triggers a file rename in ExifTool
"Directory", // System attribute
"ExifToolVersion", // Tool metadata
"Error", // Extraction error messages
"Warning", // Extraction warning messages
}
for _, tag := range derivedTags {
delete(fileMetadata[0].Fields, tag)
}
for key, value := range metadata {
switch val := value.(type) {
case string: