Created
January 7, 2011 02:12
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[newLISP]短縮URLを展開する
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#!/usr/bin/env newlisp | |
# 短縮URLを展開する | |
;; Usage: | |
;; $ newlisp get-headers.lsp http://google.com/ | |
;; -> http://www.google.com/ | |
;; NOTE: | |
;; (get-url $url "header") でもURLのヘッダー部分を取得することができるが | |
;; ステータスコードが30Xの場合、ロケーションを内部で判定してその先のヘッダを | |
;; 自動的に取得してしまうのでここでは利用できない。 | |
;; 1. 自前でHTTPリクエストを組み立てる方法 | |
(define (get-headers url) | |
(local (host path conn buffer) | |
(or (regex "http://([^/]+)/?(.*)" url) | |
(throw-error "HTTP bad formed URL")) | |
(map set '(host path) (list $1 $2)) | |
(setq conn (or (net-connect host 80) | |
(throw-error (net-error)))) | |
(net-send conn (string | |
"HEAD /" path " HTTP/1.1\r\n" | |
"Host: " host "\r\n" | |
"User-Agent: newLISP v" (sys-info -2) "\r\n" | |
"Connection: close\r\n" | |
"\r\n")) | |
;; 通信を待つ | |
(while (net-select conn "read" 1000) | |
(if (net-error) (print (net-error)))) | |
;; ヘッダ部分を読み込む | |
(net-receive conn buffer 0x1000 "\r\n\r\n") | |
(net-close conn) | |
(map (fn (h) | |
(parse h ": ")) | |
(parse buffer "\r\n")) | |
)) | |
;; 2. 外部コマンド(cURL)を利用した方法 | |
(define (get-headers url) | |
(let (header (join (exec (format "curl -sI %s" url)) "\n")) | |
(map (lambda (h) | |
(parse h ": ")) | |
(parse header "\n")))) | |
(setq $url (main-args 2)) | |
(setq $h (get-headers $url)) | |
(println (lookup "Location" $h)) | |
(exit) |
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元ネタは以下