Gatekeeper and SturdyRef
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The following definitions are taken from the
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[sturdy.prs](https://git.syndicate-lang.org/syndicate-lang/syndicate-protocols/src/branch/main/schemas/sturdy.prs)
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schema.
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schema. For further detail, see the [reference](../../protocols/syndicate/gatekeeper.md).
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```preserves-schema
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SturdyRef = <ref @oid any @caveatChain [Attenuation ...] @sig bytes>.
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@ -1 +1,61 @@
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# Gatekeeper and Sturdy-references
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- [`[syndicate-protocols]/schemas/gatekeeper.prs`](https://git.syndicate-lang.org/syndicate-lang/syndicate-protocols/src/branch/main/schemas/gatekeeper.prs)
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- [`[syndicate-protocols]/schemas/sturdy.prs`](https://git.syndicate-lang.org/syndicate-lang/syndicate-protocols/src/branch/main/schemas/sturdy.prs)
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## Gatekeeper protocol
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The Gatekeeper protocol allows a peer to "upgrade" a `SturdyRef` to a live reference to an
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entity. For details of the use of `Resolve` and `Bind` assertions, see the [guide to the
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built-in gatekeeper entity](../../operation/builtin/gatekeeper.md).
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**Implementation.** The protocol is implemented within the
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[`syndicate-server`](../../operation/system-bus.md) program.
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```
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Resolve = <resolve @sturdyref sturdy.SturdyRef @observer #!#!any>.
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Bind = <bind @oid any @key bytes @target #!any>.
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```
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## Sturdy-reference structures
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A "sturdyref" is a long-lived certificate including a cryptographic signature that can be
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upgraded by a gatekeeper entity to a live reference to the entity named in the sturdyref. For
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an overview of `SturdyRef`s, see the [guide to the built-in gatekeeper
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entity](../../operation/builtin/gatekeeper.md#sturdyrefs).
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```
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SturdyRef = <ref @oid any @caveatChain [Attenuation ...] @sig bytes>.
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```
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For detail of the interpretation of `Attenuation`s, `Caveat`s, `Pattern`s, and `Template`s, see
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the [Syndicate protocol specification](../../protocol.md#capabilities-on-the-wire).
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```
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Attenuation = [Caveat ...].
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Caveat = Rewrite / Alts .
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Rewrite = <rewrite @pattern Pattern @template Template>.
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Alts = <or @alternatives [Rewrite ...]>.
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Lit = <lit @value any>.
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Pattern = PDiscard / PAtom / PEmbedded / PBind / PAnd / PNot / Lit / PCompound .
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PDiscard = <_>.
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PAtom = =Boolean / =Float / =Double / =SignedInteger / =String / =ByteString / =Symbol .
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PEmbedded = =Embedded .
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PBind = <bind @pattern Pattern>.
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PAnd = <and @patterns [Pattern ...]>.
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PNot = <not @pattern Pattern>.
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PCompound =
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/ @rec <rec @label any @fields [Pattern ...]>
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/ @arr <arr @items [Pattern ...]>
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/ @dict <dict @entries { any: Pattern ...:... }> .
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Template = TAttenuate / TRef / Lit / TCompound .
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TAttenuate = <attenuate @template Template @attenuation Attenuation>.
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TRef = <ref @binding int>.
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TCompound =
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/ @rec <rec @label any @fields [Template ...]>
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/ @arr <arr @items [Template ...]>
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/ @dict <dict @entries { any: Template ...:... }> .
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```
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