How to Detect MIME Types Beyond Standard Support in Go: A Comparison of Custom Packages.

Detecting Additional MIME Types in Golang Beyond Standard Support

Standard Go's http.DetectContentType([]byte) function can identify a limited number of MIME types. For more comprehensive detection, including those not based on file extension, such as DOCX, XLS, PPT, and ODP, the community has developed several custom packages.

Recommended Packages for Customizable MIME Type Detection

• filetype:

  • Pure Go implementation without C bindings
  • Easily extensible for custom MIME type detection
  • Potential issues with ambiguity (e.g., XLSX and DOCX both recognized as ZIP)
  • Limited number of built-in detected MIME types

• magicmime:

  • Requires libmagic-dev to be installed
  • Extensive detection capabilities with the highest number of supported MIME types
  • Extensible with libmagic
  • Not thread-safe

• mimetype:

  • Pure Go, without C bindings
  • More MIME types supported than filetype
  • Thread-safe
  • Extensible, allowing for user-defined detection rules

Example Usage

To use these packages, simply install them using the go get command, e.g.:

go get github.com/howeyc/fs

Then, import the package into your code and utilize its API for MIME type detection. Refer to the documentation of each package for specific usage instructions.

By choosing one of these libraries, developers can expand their MIME type detection capabilities in Golang, enabling more accurate identification of file types, regardless of whether they have well-known extensions or not.

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