blahblah.clj
· 966 B · Clojure
Исходник
(defn ^String modify-link
"Takes a DOM tree `document` and a Ring request map `request` as arguments.
This function will modify the links in <link> tags of <item> elements to point
to our download proxy. Returns the modified document as a String."
[document request]
(let [dom (parse-xml document)
tfn (doto (make-transformer)
(.setOutputProperty OutputKeys/INDENT "yes")
(.setOutputProperty "{http://xml.apache.org/xslt}indent-amount" "2"))
src (DOMSource. dom)
dst (StreamResult. (StringWriter.))]
;; Modify all <link> tag whose child is <item>
(->> dom
(get-tags "link")
(filter in-<item>?)
(run! (fn [tag]
(let [id (get-id (tag-text tag))
resource (absolute-url request id)]
(set-tag-text! tag resource)))))
;; Return the transformed feed
(.transform tfn src dst)
(.toString (.getWriter dst))))
| 1 | (defn ^String modify-link |
| 2 | "Takes a DOM tree `document` and a Ring request map `request` as arguments. |
| 3 | This function will modify the links in <link> tags of <item> elements to point |
| 4 | to our download proxy. Returns the modified document as a String." |
| 5 | [document request] |
| 6 | (let [dom (parse-xml document) |
| 7 | tfn (doto (make-transformer) |
| 8 | (.setOutputProperty OutputKeys/INDENT "yes") |
| 9 | (.setOutputProperty "{http://xml.apache.org/xslt}indent-amount" "2")) |
| 10 | src (DOMSource. dom) |
| 11 | dst (StreamResult. (StringWriter.))] |
| 12 | ;; Modify all <link> tag whose child is <item> |
| 13 | (->> dom |
| 14 | (get-tags "link") |
| 15 | (filter in-<item>?) |
| 16 | (run! (fn [tag] |
| 17 | (let [id (get-id (tag-text tag)) |
| 18 | resource (absolute-url request id)] |
| 19 | (set-tag-text! tag resource))))) |
| 20 | ;; Return the transformed feed |
| 21 | (.transform tfn src dst) |
| 22 | (.toString (.getWriter dst)))) |