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Secure raw url handler #2

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Secure raw url handler #2

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7 changes: 7 additions & 0 deletions pastebin/data.scm
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,13 @@
(use-modules (srfi srfi-9)
(srfi srfi-1)
(ice-9 ftw)
(ice-9 regex)
(ice-9 textual-ports))

(export <pb-data>
<pb-entry>
pb-entry-id
pb-entry-id-valid?
pb-entry-text
pb-data-open
pb-data-close
Expand All @@ -27,6 +29,11 @@
(id pb-entry-id set-pb-entry-id!)
(text pb-entry-text set-pb-entry-text!))

(define (pb-entry-id-valid? id)
(and (= (string-length id) 5)
(string-match "[0-9A-Za-z]{5}" id)
#t))

;; input: dir: string
;; output: <pb-data>
(define (pb-data-open dir)
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42 changes: 23 additions & 19 deletions pastebin/httpserver.scm
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,28 @@
(values (build-response #:code 400)
(lambda (port) 1))))

(define (raw-handler pb-data-path pb-id)
(if (pb-entry-id-valid? pb-id)
(values (build-response
#:code 200
#:headers '((content-type . (text/plain))))
(lambda (port)
(call-with-input-file
;; the file name
(call-with-dir-as-pb-data
pb-data-path
(lambda (p) (pb-get-file-path p pb-id)))
;; the input port
(lambda (inport)
(let A ((inport' inport))
(let ((bv (get-bytevector-n inport' 4096)))
(if (not (eof-object? bv))
(begin
(put-bytevector port bv)
(A inport')))))))))
(values (build-response #:code 404)
(lambda (port) 1))))

(define (make-pastebin-handler data-path)
(lambda (request request-body)
(match (split-and-decode-uri-path (uri-path (request-uri request)))
Expand All @@ -118,25 +140,7 @@

;; URI: /raw/<id> -- return raw content of the paste
(("raw" pb-id)
(values (build-response
#:code 200
#:headers '((content-type . (text/plain))))

(lambda (port)
(call-with-input-file
;; the file name
(call-with-dir-as-pb-data
data-path
(lambda (p) (pb-get-file-path p pb-id)))

;; the input port
(lambda (inport)
(let A ((inport' inport))
(let ((bv (get-bytevector-n inport' 4096)))
(if (not (eof-object? bv))
(begin
(put-bytevector port bv)
(A inport'))))))))))
(raw-handler data-path pb-id))

;; URI: * -- everything else -- show the top 5 paste list
(_
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