net.i2p.i2ptunnel

Class MimeTypeDetector

java.lang.Object

net.i2p.i2ptunnel.MimeTypeDetector

public class MimeTypeDetector
extends Object

Utility class for MIME type detection based on URL file extensions.

This class provides static methods to determine the MIME type of a resource based on its file extension. It is used by I2PTunnelHTTPServer to set appropriate Content-Type headers for responses and to determine which security headers and cache policies should be applied.

The MIME type detection follows the Common MIME types specification as documented at MDN: https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types

Constructor Summary

Constructors

Constructor and Description
MimeTypeDetector()

Method Summary

Modifier and Type	Method and Description
static String	detectMimeType(String url) Detects the MIME type based on a URL's file extension.
static boolean	isCustomWhitelist(String mimeType) Checks if a MIME type requires custom security headers.
static boolean	isImmutableCache(String mimeType) Checks if a MIME type should use immutable cache control headers.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MimeTypeDetector

public MimeTypeDetector()

Method Detail

detectMimeType

public static String detectMimeType(String url)

Detects the MIME type based on a URL's file extension.

If the URL contains a query string, it is stripped before checking the extension. If no matching extension is found or the URL is null, returns "application/octet-stream" as a safe default.

Parameters:

url - the URL or file path to detect the MIME type for; may be null

Returns:

the detected MIME type, or "application/octet-stream" if unknown

isCustomWhitelist

public static boolean isCustomWhitelist(String mimeType)

Checks if a MIME type requires custom security headers.

MIME types in this whitelist (text/html, application/xhtml+xml, etc.) will receive additional security headers such as Referrer-Policy and Allow headers.

Parameters:

mimeType - the MIME type to check; may be null

Returns:

true if the MIME type requires security headers, false otherwise

isImmutableCache

public static boolean isImmutableCache(String mimeType)

Checks if a MIME type should use immutable cache control headers.

MIME types that match known immutable content patterns (images, fonts, video, audio, etc.) will receive "Cache-Control: private, max-age=31536000, immutable" to enable long-term caching.

Parameters:

mimeType - the MIME type to check; may be null

Returns:

true if the MIME type should use immutable cache control, false otherwise