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gh-url.el
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gh-url.el
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;;; gh-url.el --- url wrapper for gh.el -*- lexical-binding: t; -*-
;; Copyright (C) 2012 Yann Hodique
;; Author: Yann Hodique <yann.hodique@gmail.com>
;; Keywords:
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;;; Code:
(require 'eieio)
(require 'url-http)
(defclass gh-url-request ()
((method :initarg :method :type string)
(url :initarg :url :type string)
(query :initarg :query :initform nil)
(headers :initarg :headers :initform nil)
(data :initarg :data :initform "" :type string)
(async :initarg :async :initform nil)
(num-retries :initarg :num-retries :initform 0)
(install-callbacks :initarg :install-callbacks :initform nil)
(default-response-cls :allocation :class :initform gh-url-response)))
(defclass gh-url-response ()
((data-received :initarg :data-received :initform nil)
(data :initarg :data :initform nil)
(headers :initarg :headers :initform nil)
(http-status :initarg :http-status :initform nil)
(callbacks :initarg :callbacks :initform nil)
(transform :initarg :transform :initform nil)
(-req :initarg :-req :initform nil)))
(cl-defmethod gh-url-response-set-data ((resp gh-url-response) data)
(let ((transform (oref resp :transform)))
(oset resp :data
(if transform
(funcall transform data)
data))
(oset resp :data-received t)))
(defclass gh-url-callback ()
nil)
(cl-defmethod gh-url-callback-run ((cb gh-url-callback) resp)
nil)
(cl-defmethod gh-url-response-run-callbacks ((resp gh-url-response))
(let ((copy-list (lambda (list)
(if (consp list)
(let ((res nil))
(while (consp list) (push (pop list) res))
(prog1 (nreverse res) (setcdr res list)))
(car list)))))
(let ((data (oref resp :data)))
(dolist (cb (funcall copy-list (oref resp :callbacks)))
(cond ((and (object-p cb)
(object-of-class-p cb 'gh-url-callback))
(gh-url-callback-run cb resp))
((or (functionp cb) (symbolp cb))
(funcall cb data))
(t (apply (car cb) data (cdr cb))))
(object-remove-from-list resp :callbacks cb))))
resp)
(cl-defmethod gh-url-add-response-callback ((resp gh-url-response) callback)
(object-add-to-list resp :callbacks callback t)
(if (oref resp :data-received)
(gh-url-response-run-callbacks resp)
resp))
;;; code borrowed from nicferrier's web.el
(defun gh-url-parse-headers (data)
(let* ((headers nil)
(header-lines (split-string data "\n"))
(status-line (car header-lines)))
(when (string-match
"HTTP/\\([0-9.]+\\) \\([0-9]\\{3\\}\\)\\( \\(.*\\)\\)*"
status-line)
(push (cons 'status-version (match-string 1 status-line)) headers)
(push (cons 'status-code (match-string 2 status-line)) headers)
(push (cons 'status-string
(or (match-string 4 status-line) ""))
headers))
(cl-loop for line in (cdr header-lines)
if (string-match
"^\\([A-Za-z0-9.-]+\\):[ ]*\\(.*\\)"
line)
do
(let ((name (match-string 1 line))
(value (match-string 2 line)))
(push (cons name value) headers)))
headers))
(cl-defmethod gh-url-response-finalize ((resp gh-url-response))
(when (oref resp :data-received)
(gh-url-response-run-callbacks resp)))
(cl-defmethod gh-url-response-init ((resp gh-url-response)
buffer)
(declare (special url-http-end-of-headers))
(unwind-protect
(with-current-buffer buffer
(let ((headers (gh-url-parse-headers
(buffer-substring
(point-min) (1+ url-http-end-of-headers)))))
(oset resp :headers headers)
(oset resp :http-status (read (cdr (assoc 'status-code headers)))))
(goto-char (1+ url-http-end-of-headers))
(let ((raw (buffer-substring (point) (point-max))))
(gh-url-response-set-data resp raw)))
(kill-buffer buffer))
(gh-url-response-finalize resp)
resp)
(defun gh-url-set-response (status req-resp)
(set-buffer-multibyte t)
(cl-destructuring-bind (req resp) req-resp
(let ((responses-req (clone req))
(num (oref req :num-retries)))
(oset resp :-req responses-req)
(if (or (null num) (zerop num))
(gh-url-response-init resp (current-buffer))
(condition-case err
(gh-url-response-init resp (current-buffer))
(error
(oset req :num-retries (1- num))
(gh-url-run-request req resp)))))))
(defun gh-url-form-encode (form)
(mapconcat (lambda (x) (format "%s=%s" (car x) (cdr x)))
form "&"))
(defun gh-url-params-encode (form)
(concat "?" (gh-url-form-encode form)))
(cl-defmethod gh-url-run-request ((req gh-url-request) &optional resp)
(let ((url-registered-auth-schemes
'(("basic" ignore . 4))) ;; don't let default handlers kick in
(url-privacy-level 'high)
(url-user-agent (format "User-Agent: URL/%s\r\n"
url-version))
(url-request-method (oref req :method))
(url-request-data (oref req :data))
(url-request-extra-headers (oref req :headers))
(url (concat (oref req :url)
(let ((params (oref req :query)))
(if params
(gh-url-params-encode params)
"")))))
(if (oref req :async)
(let* ((resp (or resp (make-instance (oref req default-response-cls))))
(req-resp (list req resp)))
(with-current-buffer
(url-retrieve url 'gh-url-set-response (list req-resp))
(set (make-local-variable 'url-registered-auth-schemes)
url-registered-auth-schemes)))
(let* ((resp (or resp (make-instance (oref req default-response-cls))))
(req-resp (list req resp)))
(with-current-buffer (url-retrieve-synchronously url)
(gh-url-set-response nil req-resp)))))
(mapc (lambda (cb)
(gh-url-add-response-callback resp cb))
(oref req :install-callbacks))
resp)
(provide 'gh-url)
;;; gh-url.el ends here