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(.module:
  [library
   [lux "*"
    [abstract
     [monad {"+" [do]}]]
    [control
     ["." io {"+" [IO]}]
     ["." try {"+" [Try]}]
     ["." exception {"+" [exception:]}]]
    [data
     ["." product]
     [text
      ["%" format {"+" [format]}]]]
    [tool
     [compiler
      ["." version]
      ["." language "_"
       ["#/." lux "_"
        ["#" version]]]]]
    [world
     [net {"+" [URL]}
      [uri {"+" [URI]}]
      ["." http "_"
       ["#" client]
       ["#/." status]
       ["@#" /]]]]]]
  ["." //
   ["#." identity {"+" [Identity]}]
   ["/#" // "_"
    ["#." artifact {"+" [Version Artifact]}
     [extension {"+" [Extension]}]]]])

(type: .public Address
  URL)

(template [<name>]
  [(exception: .public (<name> {url URL} {status Nat})
     (exception.report
      ["URL" (%.text url)]
      ["Status Code" (%.nat status)]))]

  [download_failure]
  [upload_failure]
  )

(def: .public (uri version_template artifact extension)
  (-> Version Artifact Extension URI)
  (format (///artifact.uri version_template artifact) extension))

(def: .public user_agent
  (format "LuxAedifex/" (version.format language/lux.version)))

(def: base_headers
  (List [Text Text])
  (list ["User-Agent" ..user_agent]))

(implementation: .public (repository http identity address)
  (All (_ s) (-> (http.Client IO) (Maybe Identity) Address (//.Repository IO)))

  (def: description
    address)
  (def: (download uri)
    (do [! (try.with io.monad)]
      [[status message] (: (IO (Try (@http.Response IO)))
                           (http.get (format address uri)
                                     (http.headers ..base_headers)
                                     #.None
                                     http))]
      (case status
        (^ (static http/status.ok))
        (\ ! each product.right ((value@ #@http.body message) #.None))
        
        _
        (do !
          [_ ((value@ #@http.body message) (#.Some 0))]
          (\ io.monad in (exception.except ..download_failure [(format address uri) status]))))))

  (def: (upload uri content)
    (do (try.with io.monad)
      [[status message] (: (IO (Try (@http.Response IO)))
                           (http.put (format address uri)
                                     (http.headers (case identity
                                                     #.None
                                                     ..base_headers
                                                     
                                                     (#.Some [user password])
                                                     (list& ["Authorization" (//identity.basic_auth user password)]
                                                            ..base_headers)))
                                     (#.Some content)
                                     http))
       _ ((value@ #@http.body message) (#.Some 0))]
      (case status
        (^ (static http/status.created))
        (in [])
        
        _
        (\ io.monad in (exception.except ..upload_failure [(format address uri) status])))))
  )