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|
(.module:
[library
[lux (#- Module)
[abstract
[monad (#+ do)]]
[control
["." try (#+ Try)]
["." exception (#+ exception:)]
["<>" parser
[binary (#+ Parser)]]]
[data
[collection
["." dictionary (#+ Dictionary)]]
[format
["." binary (#+ Writer)]]]
[type (#+ :sharing)
abstract]]]
[//
["." signature (#+ Signature)]
["." key (#+ Key)]
[descriptor (#+ Module)]])
(exception: #export (invalid_signature {expected Signature} {actual Signature})
(exception.report
["Expected" (signature.description expected)]
["Actual" (signature.description actual)]))
(abstract: #export (Document d)
{#signature Signature
#content d}
(def: #export (read key document)
(All [d] (-> (Key d) (Document Any) (Try d)))
(let [[document//signature document//content] (:representation document)]
(if (\ signature.equivalence =
(key.signature key)
document//signature)
(#try.Success (:sharing [e]
(Key e)
key
e
(:assume document//content)))
(exception.throw ..invalid_signature [(key.signature key)
document//signature]))))
(def: #export (write key content)
(All [d] (-> (Key d) d (Document d)))
(:abstraction {#signature (key.signature key)
#content content}))
(def: #export (check key document)
(All [d] (-> (Key d) (Document Any) (Try (Document d))))
(do try.monad
[_ (..read key document)]
(wrap (:assume document))))
(def: #export signature
(-> (Document Any) Signature)
(|>> :representation (get@ #signature)))
(def: #export (writer content)
(All [d] (-> (Writer d) (Writer (Document d))))
(let [writer (binary.and signature.writer
content)]
(|>> :representation writer)))
(def: #export parser
(All [d] (-> (Parser d) (Parser (Document d))))
(|>> (<>.and signature.parser)
(\ <>.monad map (|>> :abstraction))))
)
|
