[3.0.x] MYFACES-4761: Facelet path validation - #1046
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Strengthen resolveURL() with four layered guards to prevent unsafe Facelet resource resolution: 1. Scheme check — rejects remote/network URI schemes (http, https, ftp, etc.) using a fast colon-index scan; OSGi/container schemes (jar, wsjar, file, zip) are intentionally allowed. 2. Traversal guard — for relative paths, verifies the resolved URL remains within the application base (WAR/EAR root) to prevent directory traversal attacks. 3. WEB-INF XML guard (scaffolded, currently disabled) — isWebInfConfigFile() is in place to block XML config descriptors under WEB-INF/ if .xml is ever added as a Facelet suffix. 4. Extension/suffix check — rejects paths whose extension is not in the configured Facelet suffix set (jakarta.faces.FACELETS_SUFFIX / jakarta.faces.FACELETS_VIEW_MAPPINGS), cached after the first call. Also adds FINE-level logging at each rejection point and a log of the computed allowed-suffix set on first initialisation. UnitTest project stage bypasses guards 2-4 to allow tests that use synthetic paths not backed by a real WAR layout.
Add InvalidFileException (extends IOException) with a typed Reason enum to replace the generic MalformedURLException throws in resolveURL(). Reason values: DISALLOWED_SCHEME — blocked remote/network URI scheme PATH_TRAVERSAL — resolved URL escapes the application base INVALID_EXTENSION — extension not a configured Facelet suffix Callers can now catch InvalidFileException and inspect getReason() to programmatically distinguish between rejection causes without parsing exception messages.
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