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(.using
 [library
  [lux (.except)
   [abstract
    [monad (.only do)]]
   [control
    ["[0]" io (.only IO)]
    ["[0]" try (.only Try)]
    ["[0]" exception (.only exception:)]]
   [data
    ["[0]" product]
    [text
     ["%" \\format (.only format)]]
    [collection
     ["[0]" list]]]
   ["[0]" meta
    ["[1]/[0]" version]]
   [tool
    [compiler
     ["[0]" version]]]
   [world
    [net (.only URL)
     [uri (.only URI)]
     ["[0]" http
      ["[1]" client]
      ["[1]/[0]" status]
      ["@[1]" /]]]]]]
 ["[0]" // (.only)
  ["[1][0]" identity (.only Identity)]
  ["/[1]" //
   ["[1][0]" artifact (.only Version Artifact)
    [extension (.only Extension)]]]])

(type: .public Address
  URL)

(with_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 meta/version.latest)))

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

(def: .public (repository http identity address)
  (All (_ s) (-> (http.Client IO) (Maybe Identity) Address (//.Repository IO)))
  (implementation
   (def: description
     address)
   (def: (download uri)
     (do [! (try.with io.monad)]
       [[status message] (is (IO (Try (@http.Response IO)))
                             (http.get (format address uri)
                                       (http.headers ..base_headers)
                                       {.#None}
                                       http))]
       (case status
         (pattern (static http/status.ok))
         (at ! each product.right ((the @http.#body message) {.#None}))
         
         _
         (do !
           [_ ((the @http.#body message) {.#Some 0})]
           (at io.monad in (exception.except ..download_failure [(format address uri) status]))))))

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