🐛 Fix image magick info call

🐛 Fix issue with pdf render on exporter

CHANGES.md

@@ -1,5 +1,11 @@
 # CHANGELOG
 
+## 2.13.1
+
+### :bug: Bugs fixed
+
+- Fix PDF Exporter outputs empty page when board has A4 format [Taiga #13181](https://tree.taiga.io/project/penpot/issue/13181)
+
 ## 2.13.0
 
 ### :heart: Community contributions (Thank you!)

backend/src/app/media.clj

@@ -34,9 +34,7 @@
    javax.xml.XMLConstants
    javax.xml.parsers.SAXParserFactory
    org.apache.commons.io.IOUtils
-   org.im4java.core.ConvertCmd
-   org.im4java.core.IMOperation
-   org.im4java.core.Info))
+   org.im4java.core.ConvertCmd))
 
 (def default-max-file-size
   (* 1024 1024 10)) ; 10 MiB
@@ -224,17 +222,18 @@
   ;; If we are processing an animated gif we use the first frame with -scene 0
   (let [dim-result (sh/sh "identify" "-format" "%w %h\n" path)
         orient-result (sh/sh "identify" "-format" "%[EXIF:Orientation]\n" path)]
-    (if (and (= 0 (:exit dim-result))
-             (= 0 (:exit orient-result)))
+    (when (= 0 (:exit dim-result))
       (let [[w h] (-> (:out dim-result)
                       str/trim
                       (clojure.string/split #"\s+")
                       (->> (mapv #(Integer/parseInt %))))
-            orientation (-> orient-result :out str/trim)]
-        (case orientation
-          ("6" "8") {:width h :height w} ; Rotated 90 or 270 degrees
-          {:width w :height h}))         ; Normal or unknown orientation
-      nil)))
+            orientation-exit (:exit orient-result)
+            orientation      (-> orient-result :out str/trim)]
+        (if (= 0 orientation-exit)
+          (case orientation
+            ("6" "8") {:width h :height w} ; Rotated 90 or 270 degrees
+            {:width w :height h})          ; Normal or unknown orientation
+          {:width w :height h})))))        ; If orientation can't be read, use dimensions as-is
 
 (defmethod process :info
   [{:keys [input] :as params}]
@@ -247,26 +246,37 @@
                     :hint "uploaded svg does not provides dimensions"))
         (merge input info {:ts (ct/now) :size (fs/size path)}))
 
-      (let [instance (Info. (str path))
-            mtype'   (.getProperty instance "Mime type")]
+      (let [path-str      (str path)
+            identify-res  (sh/sh "identify" "-format" "image/%[magick]\n" path-str)
+            ;; identify prints one line per frame (animated GIFs, etc.); we take the first one
+            mtype'        (if (zero? (:exit identify-res))
+                            (-> identify-res
+                                :out
+                                str/trim
+                                (str/split #"\s+" 2)
+                                first
+                                str/lower)
+                            (ex/raise :type :validation
+                                      :code :invalid-image
+                                      :hint "invalid image"))
+            {:keys [width height]}
+            (or (get-dimensions-with-orientation path-str)
+                (do
+                  (l/warn "Failed to read image dimensions with orientation" {:path path})
+                  (ex/raise :type :validation
+                            :code :invalid-image
+                            :hint "invalid image")))]
         (when (and (string? mtype)
-                   (not= mtype mtype'))
+                   (not= (str/lower mtype) mtype'))
           (ex/raise :type :validation
                     :code :media-type-mismatch
                     :hint (str "Seems like you are uploading a file whose content does not match the extension."
                                "Expected: " mtype ". Got: " mtype')))
-        (let [{:keys [width height]}
-              (or (get-dimensions-with-orientation (str path))
-                  (do
-                    (l/warn "Failed to read image dimensions with orientation; falling back to im4java"
-                            {:path path})
-                    {:width  (.getPageWidth instance)
-                     :height (.getPageHeight instance)}))]
-          (assoc input
-                 :width  width
-                 :height height
-                 :size (fs/size path)
-                 :ts (ct/now)))))))
+        (assoc input
+               :width  width
+               :height height
+               :size (fs/size path)
+               :ts (ct/now))))))
 
 (defmethod process-error org.im4java.core.InfoException
   [error]

exporter/src/app/renderer/pdf.cljs

@@ -38,6 +38,24 @@
                   (assoc :path "/render.html")
                   (assoc :query (u/map->query-string params)))))
 
+          (sync-page-size! [dom]
+            (bw/eval! dom
+                      (fn [elem]
+                        ;; IMPORTANT: No CLJS runtime allowed. Use only JS
+                        ;; primitives.  This runs in a context without access to
+                        ;; cljs.core. Avoid any functions that transpile to
+                        ;; cljs.core/* calls, as they will break in the browser
+                        ;; runtime.
+
+                        (let [width (.getAttribute ^js elem "width")
+                              height (.getAttribute ^js elem "height")
+                              style-node (let [node (.createElement js/document "style")]
+                                           (.appendChild (.-head js/document) node)
+                                           node)]
+                          (set! (.-textContent style-node)
+                                (dm/str "@page { size: " width "px " height "px; margin: 0; }\n"
+                                        "html, body, #app { margin: 0; padding: 0; width: " width "px; height: " height "px; overflow: visible; }"))))))
+
           (render-object [page base-uri {:keys [id] :as object}]
             (p/let [uri  (prepare-uri base-uri id)
                     path (sh/tempfile :prefix "penpot.tmp.pdf." :suffix (mime/get-extension type))]
@@ -45,6 +63,7 @@
               (bw/nav! page uri)
               (p/let [dom (bw/select page (dm/str "#screenshot-" id))]
                 (bw/wait-for dom)
+                (sync-page-size! dom)
                 (bw/screenshot dom {:full-page? true})
                 (bw/sleep page 2000) ; the good old fix with sleep
                 (bw/pdf page {:path path})