master aa27c42: mh-x-image-url-sane-p: accept "https" URLs

[Stephen Gildea]

branch: master
commit aa27c42cf910391d87396ffed3d2835417471b46
Author: Stephen Gildea <stepheng+emacs@gildea.com>
Commit: Stephen Gildea <stepheng+emacs@gildea.com>

    mh-x-image-url-sane-p: accept "https" URLs
    
    * lisp/mh-e/mh-xface.el (mh-x-image-url-sane-p): Accept https URLs.
    * test/lisp/mh-e/mh-xface.el: New file, to test mh-x-image-url-sane-p.
---
 lisp/mh-e/mh-xface.el            | 10 ++++++----
 test/lisp/mh-e/mh-xface-tests.el | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/lisp/mh-e/mh-xface.el b/lisp/mh-e/mh-xface.el
index d4d5c5c..bc4cc6e 100644
--- a/lisp/mh-e/mh-xface.el
+++ b/lisp/mh-e/mh-xface.el
@@ -391,10 +391,12 @@ filenames.  In addition, replaces * with %2a. See URL
 (defun mh-x-image-url-sane-p (url)
   "Check if URL is something sensible."
   (let ((len (length url)))
-    (cond ((< len 5) nil)
-          ((not (equal (substring url 0 5) "http:")) nil)
-          ((> len 100) nil)
-          (t t))))
+    (cond ((> len 100) nil)
+          ((and (>= len 5)
+                (equal (substring url 0 5) "http:") t))
+          ((and (>= len 6)
+                (equal (substring url 0 6) "https:") t))
+          (t nil))))
 
 (defun mh-x-image-display (image marker)
   "Display IMAGE at MARKER."
diff --git a/test/lisp/mh-e/mh-xface-tests.el b/test/lisp/mh-e/mh-xface-tests.el
new file mode 100644
index 0000000..65e3c82
--- /dev/null
+++ b/test/lisp/mh-e/mh-xface-tests.el
@@ -0,0 +1,35 @@
+;;; mh-xface-tests.el --- tests for mh-xface.el -*- lexical-binding: t -*-
+
+;; Copyright (C) 2021 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+(require 'mh-xface)
+
+(ert-deftest mh-x-image-url-sane-p ()
+  "Test that `mh-x-image-url-sane-p' accepts a URL exactly if it is sane."
+  (should (equal (mh-x-image-url-sane-p (concat "http://";
+                                                (make-string 101 ?a)))
+                 nil))                  ;too long
+  (should (equal (mh-x-image-url-sane-p "http") nil)) ;too short
+  (should (equal (mh-x-image-url-sane-p "http:") t))
+  (should (equal (mh-x-image-url-sane-p "https") nil)) ;too short
+  (should (equal (mh-x-image-url-sane-p "https:") t))
+  (should (equal (mh-x-image-url-sane-p "https://www.example.com/me.png";) t))
+  (should (equal (mh-x-image-url-sane-p "abcde:") nil)))