diff options
| -rw-r--r-- | assets/strapdown.js | 5 | ||||
| -rw-r--r-- | modules/markdown-config.el | 28 | ||||
| -rw-r--r-- | tests/test-markdown-config.el | 21 |
3 files changed, 51 insertions, 3 deletions
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\ No newline at end of file diff --git a/modules/markdown-config.el b/modules/markdown-config.el index 4b6c9947d..cb37556f7 100644 --- a/modules/markdown-config.el +++ b/modules/markdown-config.el @@ -70,10 +70,34 @@ lives in a separate command." ;; rendered. (browse-url "http://localhost:8080/imp")) +;; strapdown.js renders the markdown client-side. It is vendored under +;; assets/ and embedded inline rather than loaded from +;; http://ndossougbe.github.io/strapdown/dist/strapdown.js: the CDN was plain +;; HTTP (mixed content), an unmaintained third-party github.io page (a +;; supply-chain and MITM surface), and made the preview fail with no network. +;; The bundle (jQuery + marked + bootstrap themes) is self-contained, so inlining +;; it serves the whole preview from localhost. Refresh by re-downloading the +;; dist build into assets/strapdown.js. +(defconst cj/markdown--strapdown-file + (expand-file-name "assets/strapdown.js" user-emacs-directory) + "Path to the vendored strapdown.js bundle served with the markdown preview.") + +(defvar cj/markdown--strapdown-cache nil + "Cached contents of `cj/markdown--strapdown-file', read once on first preview.") + +(defun cj/markdown--strapdown-js () + "Return the vendored strapdown.js source, reading and caching it once." + (or cj/markdown--strapdown-cache + (setq cj/markdown--strapdown-cache + (with-temp-buffer + (insert-file-contents-literally cj/markdown--strapdown-file) + (buffer-string))))) + (defun cj/markdown-html (buffer) (princ (with-current-buffer buffer - (format "<!DOCTYPE html><html><title>Impatient Markdown</title><xmp theme=\"united\" style=\"display:none;\"> %s </xmp><script src=\"http://ndossougbe.github.io/strapdown/dist/strapdown.js\"></script></html>" - (buffer-substring-no-properties (point-min) (point-max)))) + (format "<!DOCTYPE html><html><title>Impatient Markdown</title><xmp theme=\"united\" style=\"display:none;\"> %s </xmp><script>%s</script></html>" + (buffer-substring-no-properties (point-min) (point-max)) + (cj/markdown--strapdown-js))) (current-buffer))) ;; Bind the preview key after the defun so use-package's `:bind' autoload diff --git a/tests/test-markdown-config.el b/tests/test-markdown-config.el index edb20d357..e079a8b44 100644 --- a/tests/test-markdown-config.el +++ b/tests/test-markdown-config.el @@ -37,10 +37,29 @@ (let ((html (buffer-string))) (should (string-match-p "<!DOCTYPE html>" html)) (should (string-match-p "<xmp" html)) - (should (string-match-p "strapdown\\.js" html)) (should (string-match-p "some \\*\\*markdown\\*\\*" html))))) (kill-buffer src)))) +(ert-deftest test-markdown-html-vendors-strapdown-no-external-cdn () + "Normal: the preview embeds the vendored strapdown inline and references no +external CDN, so the preview works offline and doesn't load third-party JS over +plain HTTP." + (let ((src (generate-new-buffer " *md-cdn*"))) + (unwind-protect + (progn + (with-current-buffer src (insert "# Hello")) + (with-temp-buffer + (cj/markdown-html src) + (let ((html (buffer-string))) + ;; No external CDN of any kind. + (should-not (string-match-p "ndossougbe" html)) + (should-not (string-match-p "src=\"https?://" html)) + ;; Vendored strapdown is embedded inline (a bare <script> with the + ;; ~121KB bundle, not a <script src=...>). + (should (string-match-p "<script>" html)) + (should (> (length html) 100000))))) + (kill-buffer src)))) + (ert-deftest test-markdown-html-empty-source-buffer () "Boundary: an empty source buffer still yields the HTML shell." (let ((src (generate-new-buffer " *md-empty*"))) |