141 lines
4.2 KiB
Racket
141 lines
4.2 KiB
Racket
#lang racket/base
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(require json
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racket/contract
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racket/file
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racket/port
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racket/runtime-path
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racket-mimetypes
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web-server/dispatch
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web-server/http
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web-server/http/json
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web-server/servlet-env
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"player.rkt")
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(provide serve-player)
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(define-runtime-path public-directory "../public")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; HTTP handlers
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define current-player #f)
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(define (json-response value #:code [code 200])
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(response/jsexpr
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value
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#:code code
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#:headers (list (header #"Cache-Control" #"no-store"))))
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(define (error-response exception)
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(json-response
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(hasheq 'error (exn-message exception))
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#:code 400))
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(define (request-jsexpr request)
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(let ((body (request-post-data/raw request)))
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(if (and body (positive? (bytes-length body)))
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(bytes->jsexpr body)
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(hasheq))))
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(define (state-handler _request)
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(json-response (player-state->jsexpr current-player)))
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(define (discover-handler _request)
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(player-discover! current-player)
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(json-response (player-state->jsexpr current-player)))
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(define (command-handler request command)
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(with-handlers
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((exn:fail? error-response))
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(json-response
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(player-command!
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current-player
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command
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(request-jsexpr request)))))
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(define (agent-register-handler request)
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(with-handlers
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((exn:fail? error-response))
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(json-response
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(player-agent-register!
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current-player
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(request-jsexpr request)))))
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(define (agent-poll-handler request)
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(with-handlers
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((exn:fail? error-response))
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(json-response
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(player-agent-poll!
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current-player
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(request-jsexpr request)))))
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(define (agent-media-handler _request app-id token)
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(let ((file (player-agent-media current-player app-id token)))
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(if (and file (file-exists? file))
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(response/output
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(λ (output)
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(call-with-input-file
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file
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(λ (input)
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(copy-port input output))))
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#:mime-type
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(let ((mime (mimetype-for-ext file)))
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(if (string? mime)
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(string->bytes/utf-8 mime)
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#"application/octet-stream"))
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#:headers
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(list
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(header #"Content-Length"
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(string->bytes/utf-8
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(number->string (file-size file))))
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(header #"Cache-Control" #"no-store")))
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(json-response
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(hasheq 'error "media token is invalid or expired")
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#:code 404))))
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(define-values (dispatch _url)
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(dispatch-rules
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[("api" "state") #:method "get" state-handler]
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[("api" "discover") #:method "post" discover-handler]
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[("api" "agent" "register") #:method "post" agent-register-handler]
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[("api" "agent" "poll") #:method "post" agent-poll-handler]
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[("api" "agent" "media" (string-arg) (string-arg))
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#:method "get"
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agent-media-handler]
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[("api" "command" (string-arg))
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#:method "post"
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command-handler]))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Provided functions
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; goal : Serve the web interface and JSON player API.
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; pre : Value is a player, listen-ip is a string, and port is valid.
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; post : Static files and API routes are served until the server stops.
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; result : The result returned by serve/servlet.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define/contract (serve-player value
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#:listen-ip [listen-ip "127.0.0.1"]
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#:port [port 8080]
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#:launch-browser? [launch-browser? #t])
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(->* (any/c)
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(#:listen-ip string?
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#:port exact-positive-integer?
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#:launch-browser? boolean?)
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any)
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(set! current-player value)
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(serve/servlet
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dispatch
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#:listen-ip listen-ip
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#:port port
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#:connection-close? #t
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#:launch-browser? launch-browser?
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#:quit? #f
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#:banner? #t
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#:servlet-regexp #rx"^/api(?:/|$)"
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#:extra-files-paths (list public-directory)))
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