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0b373817a8
Adds a chi middleware that detects MS Graph colon-syntax URLs and rewrites
them to the canonical /items/{itemID}/... form before chi performs route
matching. Existing handlers, routes, and GetDriveAndItemIDParam stay
unchanged.
Two URL shapes are recognized at both /v1.0 and /v1beta1:
/drives/{driveID}/root:/<path>[:/<suffix>][:]
/drives/{driveID}/items/{itemID}:/<relativePath>[:/<suffix>][:]
Path resolution runs as the request user via CS3 Stat. Both NOT_FOUND and
PERMISSION_DENIED collapse to a 404 response so existence isn't disclosed
to unauthorized callers. URLs without colon syntax fast-path through with
a single substring check. The original URL is stashed in request context
under OriginalPathContextKey for downstream tracing/logging.
The middleware is registered as a top-level mux.Use so it runs before any
route matching: chi middleware on a sub-router runs after the prefix is
matched but cannot redirect to a different leaf route. Top-level
middleware lets URL rewriting actually re-route the request.
Tests cover regex matching across versions, all rewrite variants
(root/items anchored, with/without suffix, with/without trailing colon,
deep paths), NOT_FOUND -> 404, PERMISSION_DENIED -> 404 (security: no
existence disclosure), and original-URL preservation in request context.