Hash path-based metadata cache keys
Conan, CRAN, Conda, RPM, the main Debian archive and the default Maven
repository keyed cached metadata by the request path with '/' replaced
by '_'. Names and versions may contain '_', so foo/bar_1.0 and
foo_bar/1.0 shared an entry, and with cache_metadata one reference's
recipe files were served for the other. Conan also appended the query
with '_', so a path without a query could collide with a shorter path
plus one.
Hash the upstream URL, the path and, for Conan, the query instead, as
the APK, Arch, generic and Helm handlers already do. Each part is
length-prefixed so no two inputs share a key.
2026-10-24 08:02:07 +02:00
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package handler
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import (
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"crypto/sha256"
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"encoding/hex"
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"strconv"
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)
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// hashedCacheKey derives a metadata cache key from parts such as the
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// upstream URL, the request path and the query. Each part is length-prefixed
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// before hashing, so no two different part lists share a key, whatever bytes
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2026-10-25 09:55:14 +00:00
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// the parts contain.
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Hash path-based metadata cache keys
Conan, CRAN, Conda, RPM, the main Debian archive and the default Maven
repository keyed cached metadata by the request path with '/' replaced
by '_'. Names and versions may contain '_', so foo/bar_1.0 and
foo_bar/1.0 shared an entry, and with cache_metadata one reference's
recipe files were served for the other. Conan also appended the query
with '_', so a path without a query could collide with a shorter path
plus one.
Hash the upstream URL, the path and, for Conan, the query instead, as
the APK, Arch, generic and Helm handlers already do. Each part is
length-prefixed so no two inputs share a key.
2026-10-24 08:02:07 +02:00
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func hashedCacheKey(parts ...string) string {
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h := sha256.New()
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for _, part := range parts {
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_, _ = h.Write([]byte(strconv.Itoa(len(part))))
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_, _ = h.Write([]byte{':'})
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_, _ = h.Write([]byte(part))
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}
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return hex.EncodeToString(h.Sum(nil))
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}
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