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emacs: add http-twiddle for POST debugging
author Augie Fackler <durin42@gmail.com>
date Thu, 17 Sep 2009 10:33:59 -0500
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142:daceba28ace4 143:35eef880a5ac
1 ;;; http-twiddle.el -- send & twiddle & resend HTTP requests
2 ;;
3 ;; Version 1.0 written by Luke Gorrie <luke@synap.se> in February 2006
4 ;; This program belongs to the public domain.
5 ;;
6 ;; (downloaded from http://fresh.homeunix.net/~luke/misc/emacs/http-twiddle.el)
7 ;;
8 ;; This is a program for testing hand-written HTTP requests. You write
9 ;; your request in an Emacs buffer (using http-twiddle-mode) and then
10 ;; press `C-c C-c' each time you want to try sending it to the server.
11 ;; This way you can interactively debug the requests. To change port or
12 ;; destination do `C-u C-c C-c'.
13 ;;
14 ;; The program is particularly intended for the POST-"500 internal
15 ;; server error"-edit-POST loop of integration with SOAP programs.
16 ;;
17 ;; The mode is activated by `M-x http-twiddle-mode' or automatically
18 ;; when opening a filename ending with .http-twiddle.
19 ;;
20 ;; The request can either be written from scratch or you can paste it
21 ;; from a snoop/tcpdump and then twiddle from there.
22 ;;
23 ;; See the documentation for the `http-twiddle-mode' and
24 ;; `http-twiddle-mode-send' functions below for more details and try
25 ;; `M-x http-twiddle-mode-demo' for a simple get-started example.
26 ;;
27 ;; Tested with GNU Emacs 21.4.1 and not tested/ported on XEmacs yet.
28
29 ;;; Example buffer:
30
31 ;; POST / HTTP/1.0
32 ;; Connection: close
33 ;; Content-Length: $Content-Length
34 ;;
35 ;; The request body goes here
36
37 (require 'font-lock) ; faces
38
39 (eval-when-compile
40 (unless (fboundp 'define-minor-mode)
41 (require 'easy-mmode)
42 (defalias 'define-minor-mode 'easy-mmode-define-minor-mode))
43 (require 'cl))
44
45 (define-minor-mode http-twiddle-mode
46 "Major mode for twiddling around with HTTP requests and sending them.
47 Use `http-twiddle-mode-send' (\\[http-twiddle-mode-send]) to send the request."
48 nil
49 " http-twiddle"
50 '(("\C-c\C-c" . http-twiddle-mode-send)))
51
52 (defvar http-twiddle-show-request t
53 "*Show the request in the transcript.")
54
55 (add-to-list 'auto-mode-alist '("\\.http-twiddle$" . http-twiddle-mode))
56
57 (defvar http-twiddle-endpoint nil
58 "Cache of the (HOST PORT) to send the request to.")
59
60 (defvar http-twiddle-process nil
61 "Socket connected to the webserver.")
62
63 (defvar http-twiddle-port-history '()
64 "History of port arguments entered in the minibuffer.
65 \(To make XEmacs happy.)")
66
67 (defvar http-twiddle-host-history '()
68 "History of port arguments entered in the minibuffer.
69 \(To make XEmacs happy.)")
70
71 (defun http-twiddle-mode-send (host port)
72 "Send the current buffer to the server.
73 Linebreaks are automatically converted to CRLF (\\r\\n) format and any
74 occurences of \"$Content-Length\" are replaced with the actual content
75 length."
76 (interactive (http-twiddle-read-endpoint))
77 ;; close any old connection
78 (when http-twiddle-process
79 (kill-buffer (process-buffer http-twiddle-process)))
80 (let ((content (buffer-string)))
81 (with-temp-buffer
82 (insert content)
83 (http-twiddle-convert-cr-to-crlf)
84 (http-twiddle-expand-content-length)
85 (let ((request (buffer-string)))
86 (setq http-twiddle-process
87 (open-network-stream "http-twiddle" "*HTTP Twiddle*" host port))
88 (set-process-filter http-twiddle-process 'http-twiddle-process-filter)
89 (set-process-sentinel http-twiddle-process 'http-twiddle-process-sentinel)
90 (process-send-string http-twiddle-process request)
91 (save-selected-window
92 (pop-to-buffer (process-buffer http-twiddle-process))
93 (when http-twiddle-show-request
94 (insert request)
95 (set-window-start (selected-window) (point))
96 (add-text-properties (point-min) (point-max)
97 '(face font-lock-comment-face)))
98 (set-mark (point)))))))
99
100 (defun http-twiddle-read-endpoint ()
101 "Return the endpoint (HOST PORT) to send the request to."
102 (if (and http-twiddle-endpoint (null current-prefix-arg))
103 http-twiddle-endpoint
104 (setq http-twiddle-endpoint
105 (list (read-string "Host: (default localhost) "
106 nil 'http-twiddle-host-history "localhost")
107 (let ((input (read-from-minibuffer "Port: " nil nil t 'http-twiddle-port-history)))
108 (if (integerp input)
109 input
110 (error "Not an integer: %S" input)))))))
111
112 (defun http-twiddle-convert-cr-to-crlf ()
113 "Convert \\n linebreaks to \\r\\n in the whole buffer."
114 (save-excursion
115 (goto-char (point-min))
116 (while (re-search-forward "[^\r]\n" nil t)
117 (backward-char)
118 (insert "\r"))))
119
120 (defun http-twiddle-expand-content-length ()
121 "Replace any occurences of $Content-Length with the actual Content-Length."
122 (save-excursion
123 (goto-char (point-min))
124 (let ((content-length
125 (save-excursion (when (search-forward "\r\n\r\n" nil t)
126 (- (point-max) (point))))))
127 (unless (null content-length)
128 (let ((case-fold-search t))
129 (while (search-forward "$content-length" nil t)
130 (replace-match (format "%d" content-length) nil t)))))))
131
132 (defun http-twiddle-process-filter (process string)
133 "Process data from the socket by inserting it at the end of the buffer."
134 (with-current-buffer (process-buffer process)
135 (goto-char (point-max))
136 (insert string)))
137
138 (defun http-twiddle-process-sentinel (process what)
139 (with-current-buffer (process-buffer process)
140 (goto-char (point-max))
141 (let ((start (point)))
142 (insert "Connection closed\n")
143 (add-text-properties start (point) '(face font-lock-string-face)))))
144
145 (defun http-twiddle-mode-demo ()
146 (interactive)
147 (pop-to-buffer (get-buffer-create "*http-twiddle demo*"))
148 (http-twiddle-mode 1)
149 (erase-buffer)
150 (insert "POST / HTTP/1.0\nContent-Length: $Content-Length\nConnection: close\n\nThis is the POST body.\n")
151 (message "Now press `C-c C-c' and enter a webserver address (e.g. google.com port 80)."))
152
153 (provide 'http-twiddle)