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;;; mastodon-http.el --- HTTP request/response functions for mastodon.el -*- lexical-binding: t -*-
;; Copyright (C) 2017-2019 Johnson Denen
;; Author: Johnson Denen <johnson.denen@gmail.com>
;; Version: 0.9.0
;; Package-Requires: ((emacs "24.4"))
;; Homepage: https://github.com/jdenen/mastodon.el
;; This file is not part of GNU Emacs.
;; This file is part of mastodon.el.
;; mastodon.el 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 3 of the License, or
;; (at your option) any later version.
;; mastodon.el 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 mastodon.el. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; mastodon-http.el provides HTTP request/response functions.
;;; Code:
(require 'json)
(defvar mastodon-instance-url)
(autoload 'mastodon-auth--access-token "mastodon-auth")
(defvar mastodon-http--api-version "v1")
(defconst mastodon-http--timeout 5
"HTTP request timeout, in seconds. Has no effect on Emacs < 26.1.")
(defun mastodon-http--api (endpoint)
"Return Mastondon API URL for ENDPOINT."
(concat mastodon-instance-url "/api/"
mastodon-http--api-version "/" endpoint))
(defun mastodon-http--response ()
"Capture response buffer content as string."
(with-current-buffer (current-buffer)
(buffer-substring-no-properties (point-min) (point-max))))
(defun mastodon-http--response-body (pattern)
"Return substring matching PATTERN from `mastodon-http--response'."
(let ((resp (mastodon-http--response)))
(string-match pattern resp)
(match-string 0 resp)))
(defun mastodon-http--status ()
"Return HTTP Response Status Code from `mastodon-http--response'."
(let* ((status-line (mastodon-http--response-body "^HTTP/1.*$")))
(string-match "[0-9][0-9][0-9]" status-line)
(match-string 0 status-line)))
(defun mastodon-http--triage (response success)
"Determine if RESPONSE was successful. Call SUCCESS if successful.
Open RESPONSE buffer if unsuccessful."
(let ((status (with-current-buffer response
(mastodon-http--status))))
(if (string-prefix-p "2" status)
(funcall success)
(switch-to-buffer response))))
(defun mastodon-http--post (url args headers &optional unauthenticed-p)
"POST synchronously to URL with ARGS and HEADERS.
Authorization header is included by default unless UNAUTHENTICED-P is non-nil."
(let ((url-request-method "POST")
(url-request-data
(when args
(mapconcat (lambda (arg)
(concat (url-hexify-string (car arg))
"="
(url-hexify-string (cdr arg))))
args
"&")))
(url-request-extra-headers
(append
(unless unauthenticed-p
`(("Authorization" . ,(concat "Bearer " (mastodon-auth--access-token)))))
headers)))
(with-temp-buffer
(if (< (cdr (func-arity 'url-retrieve-synchronously)) 4)
(url-retrieve-synchronously url)
(url-retrieve-synchronously url nil nil mastodon-http--timeout)))))
(defun mastodon-http--get (url)
"Make GET request to URL.
Pass response buffer to CALLBACK function."
(let ((url-request-method "GET")
(url-request-extra-headers
`(("Authorization" . ,(concat "Bearer "
(mastodon-auth--access-token))))))
(if (< (cdr (func-arity 'url-retrieve-synchronously)) 4)
(url-retrieve-synchronously url)
(url-retrieve-synchronously url nil nil mastodon-http--timeout))))
(defun mastodon-http--delete (url)
"Make DELETE request to URL."
(let ((url-request-method "DELETE")
(url-request-extra-headers
`(("Authorization" . ,(concat "Bearer "
(mastodon-auth--access-token))))))
(with-temp-buffer
(url-retrieve-synchronously url))))
(defun mastodon-http--get-json (url)
"Make GET request to URL. Return JSON response."
(with-current-buffer (mastodon-http--get url)
(mastodon-http--process-json)))
(defun mastodon-http--process-json ()
"Process JSON response."
(goto-char (point-min))
(re-search-forward "^$" nil 'move)
(let ((json-string
(decode-coding-string
(buffer-substring-no-properties (point) (point-max))
'utf-8)))
(kill-buffer)
(json-read-from-string json-string)))
;; Asynchronous functions
(defun mastodon-http--get-async (url &optional callback &rest cbargs)
"Make GET request to URL.
Pass response buffer to CALLBACK function with args CBARGS."
(let ((url-request-method "GET")
(url-request-extra-headers
`(("Authorization" . ,(concat "Bearer "
(mastodon-auth--access-token))))))
(url-retrieve url callback cbargs mastodon-http--timeout)))
(defun mastodon-http--get-json-async (url &optional callback &rest args)
"Make GET request to URL. Call CALLBACK with json-vector and ARGS."
(mastodon-http--get-async
url
(lambda (status)
(apply callback (mastodon-http--process-json) args))))
(defun mastodon-http--post-async (url args headers &optional callback &rest cbargs)
"POST asynchronously to URL with ARGS and HEADERS.
Authorization header is included by default unless UNAUTHENTICED-P is non-nil."
(let ((url-request-method "POST")
(url-request-data
(when args
(mapconcat (lambda (arg)
(concat (url-hexify-string (car arg))
"="
(url-hexify-string (cdr arg))))
args
"&")))
(url-request-extra-headers
(append `(("Authorization" . ,(concat "Bearer " (mastodon-auth--access-token))))
headers)))
(with-temp-buffer
(url-retrieve url callback cbargs mastodon-http--timeout))))
(provide 'mastodon-http)
;;; mastodon-http.el ends here
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