don't remove encryption without asking

src/Archive/Redirect.coffee

@@ -53,7 +53,9 @@ Redirect =
   post: (archive, {boardID, postID}) ->
     # For fuuka-based archives:
     # https://github.com/eksopl/fuuka/issues/27
-    URL = new String "#{Redirect.protocol archive}#{archive.domain}/_/api/chan/post/?board=#{boardID}&num=#{postID}"
+    protocol = Redirect.protocol archive
+    return '' unless protocol is 'https://' or location.protocol is 'http:'
+    URL = new String "#{protocol}#{archive.domain}/_/api/chan/post/?board=#{boardID}&num=#{postID}"
     URL.archive = archive
     URL
 
@@ -73,3 +75,13 @@ Redirect =
     else
       "#{boardID}/?task=search2&search_#{if type is 'image' then 'media_hash' else type}=#{value}"
     "#{Redirect.protocol archive}#{archive.domain}/#{path}"
+
+  navigate: (URL, alternative) ->
+    if (
+      /^https:\/\//.test(URL) or
+      location.protocol is 'http:' or
+      confirm "Redirect to #{URL}?\n\nYour connection will not be encrypted."
+    )
+      location.replace URL
+    else if alternative
+      location.replace alternative

src/General/Main.coffee

@@ -54,7 +54,7 @@ Main =
             URL = Redirect.to 'file',
               boardID:  g.BOARD.ID
               filename: pathname[pathname.length - 1]
-            location.replace URL if URL
+            Redirect.navigate URL
           else if Conf['Loop in New Tab'] and video = $ 'video'
             Video.configure video
             $.on video, 'click', ->
@@ -121,7 +121,7 @@ Main =
           boardID:  g.BOARD.ID
           threadID: g.THREADID
           postID:   +location.hash.match /\d+/ # post number or 0
-        location.replace href or "/#{g.BOARD}/"
+        Redirect.navigate href, "/#{g.BOARD}/"
       return
 
     # Something might have gone wrong!

src/Images/Gallery.coffee

@@ -180,6 +180,7 @@ Gallery =
           filename: src[src.length - 1]
         if URL
           thumb.href = URL
+        if URL and (/^https:\/\//.test(URL) or location.protocol is 'http:')
           return unless Gallery.nodes.current is file
           file.src = URL
           return

src/Images/ImageExpand.coffee

@@ -207,7 +207,7 @@ ImageExpand =
       URL = Redirect.to 'file',
         boardID:  src[3]
         filename: src[src.length - 1]
-      if URL
+      if URL and (/^https:\/\//.test(URL) or location.protocol is 'http:')
         setTimeout ImageExpand.expand, 10000, post, URL
         return
       if g.DEAD or post.isDead or post.file.isDead

src/Images/ImageHover.coffee

@@ -53,7 +53,7 @@ ImageHover =
       URL = Redirect.to 'file',
         boardID:  src[3]
         filename: src[src.length - 1].replace /\?.+$/, ''
-      if URL
+      if URL and (/^https:\/\//.test(URL) or location.protocol is 'http:')
         @src = URL
         return
       if g.DEAD or post.isDead or post.file.isDead