add option to disable mixed content security, workaround for ajax restrictions

src/Archive/Redirect.coffee

@@ -54,8 +54,8 @@ Redirect =
     # For fuuka-based archives:
     # https://github.com/eksopl/fuuka/issues/27
     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}"
+    return '' unless Redirect.securityCheck URL
     URL.archive = archive
     URL
 
@@ -76,10 +76,14 @@ Redirect =
       "#{boardID}/?task=search2&search_#{if type is 'image' then 'media_hash' else type}=#{value}"
     "#{Redirect.protocol archive}#{archive.domain}/#{path}"
 
+  securityCheck: (URL) ->
+    /^https:\/\//.test(URL) or
+    location.protocol is 'http:' or
+    Conf['Allow Mixed Content from Archives']
+
   navigate: (URL, alternative) ->
     if URL and (
-      /^https:\/\//.test(URL) or
-      location.protocol is 'http:' or
+      Redirect.securityCheck(URL) or
       confirm "Redirect to #{URL}?\n\nYour connection will not be encrypted."
     )
       location.replace URL

src/General/Config.coffee

@@ -29,6 +29,10 @@ Config =
         true
         'Redirect dead threads and images.'
       ]
+      'Allow Mixed Content from Archives': [
+        false
+        'Permit warningless access to HTTP-only archives from HTTPS pages.'
+      ]
       'Keybinds': [
         true
         'Bind actions to keyboard shortcuts.'

src/General/CrossOrigin.coffee

@@ -1,46 +1,73 @@
-CrossOrigin = do ->
+CrossOrigin =
+  file: do ->
+    makeBlob = (urlBlob, contentType, contentDisposition, url) ->
+      name = url.match(/([^\/]+)\/*$/)?[1]
+      mime = contentType?.match(/[^;]*/)[0] or 'application/octet-stream'
+      match =
+        contentDisposition?.match(/\bfilename\s*=\s*"((\\"|[^"])+)"/i)?[1] or
+        contentType?.match(/\bname\s*=\s*"((\\"|[^"])+)"/i)?[1]
+      if match
+        name = match.replace /\\"/g, '"'
+      blob = new Blob([urlBlob], {type: mime})
+      blob.name = name
+      blob
 
-  makeBlob = (urlBlob, contentType, contentDisposition, url) ->
-    name = url.match(/([^\/]+)\/*$/)?[1]
-    mime = contentType?.match(/[^;]*/)[0] or 'application/octet-stream'
-    match =
-      contentDisposition?.match(/\bfilename\s*=\s*"((\\"|[^"])+)"/i)?[1] or
-      contentType?.match(/\bname\s*=\s*"((\\"|[^"])+)"/i)?[1]
-    if match
-      name = match.replace /\\"/g, '"'
-    blob = new Blob([urlBlob], {type: mime})
-    blob.name = name
-    blob
+    (url, cb) ->
+      <% if (type === 'crx') { %>
+      $.ajax url,
+        responseType: 'blob'
+        onload: ->
+          return cb null unless @readyState is @DONE and @status is 200
+          contentType        = @getResponseHeader 'Content-Type'
+          contentDisposition = @getResponseHeader 'Content-Disposition'
+          cb (makeBlob @response, contentType, contentDisposition, url)
+        onerror: ->
+          cb null
+      <% } %>
+      <% if (type === 'userscript') { %>
+      GM_xmlhttpRequest
+        method: "GET"
+        url: url
+        overrideMimeType: "text/plain; charset=x-user-defined"
+        onload: (xhr) ->
+          r = xhr.responseText
+          data = new Uint8Array r.length
+          i = 0
+          while i < r.length
+            data[i] = r.charCodeAt i
+            i++
+          contentType        = xhr.responseHeaders.match(/Content-Type:\s*(.*)/i)?[1]
+          contentDisposition = xhr.responseHeaders.match(/Content-Disposition:\s*(.*)/i)?[1]
+          cb (makeBlob data, contentType, contentDisposition, url)
+        onerror: ->
+          cb null
+      <% } %>
 
-  file = (url, cb) ->
-    <% if (type === 'crx') { %>
-    $.ajax url,
-      responseType: 'blob'
-      onload: ->
-        return cb null unless @readyState is @DONE and @status is 200
-        contentType        = @getResponseHeader 'Content-Type'
-        contentDisposition = @getResponseHeader 'Content-Disposition'
-        cb (makeBlob @response, contentType, contentDisposition, url)
-      onerror: ->
-        cb null
-    <% } %>
-    <% if (type === 'userscript') { %>
-    GM_xmlhttpRequest
-      method: "GET"
-      url: url
-      overrideMimeType: "text/plain; charset=x-user-defined"
-      onload: (xhr) ->
-        r = xhr.responseText
-        data = new Uint8Array r.length
-        i = 0
-        while i < r.length
-          data[i] = r.charCodeAt i
-          i++
-        contentType        = xhr.responseHeaders.match(/Content-Type:\s*(.*)/i)?[1]
-        contentDisposition = xhr.responseHeaders.match(/Content-Disposition:\s*(.*)/i)?[1]
-        cb (makeBlob data, contentType, contentDisposition, url)
-      onerror: ->
-        cb null
-    <% } %>
-
-  {file}
+  json: do ->
+    callbacks = {}
+    responses = {}
+    (url, cb) ->
+      <% if (type === 'crx') { %>
+      $.cache url, (-> cb @response), responseType: 'json'
+      <% } %>
+      <% if (type === 'userscript') { %>
+      if responses[url]
+        cb responses[url]
+        return
+      if callbacks[url]
+        callbacks[url].push cb
+        return
+      callbacks[url] = [cb]
+      GM_xmlhttpRequest
+        method: "GET"
+        url: url
+        onload: (xhr) ->
+          response = JSON.parse xhr.responseText
+          cb response for cb in callbacks[url]
+          delete callbacks[url]
+          responses[url] = response
+        onerror: ->
+          delete callbacks[url]
+        onabort: ->
+          delete callbacks[url]
+      <% } %>

src/General/Get.coffee

@@ -132,20 +132,25 @@ Get =
     Get.insert post, root, context
   archivedPost: (boardID, postID, root, context) ->
     return false unless url = Redirect.to 'post', {boardID, postID}
-    $.cache url,
-      -> Get.parseArchivedPost @, boardID, postID, root, context
-    ,
-      responseType: 'json'
-      withCredentials: url.archive.withCredentials
-    return true
-  parseArchivedPost: (req, boardID, postID, root, context) ->
+    if /^https:\/\//.test(URL) or location.protocol is 'http:'
+      $.cache url,
+        -> Get.parseArchivedPost @response, boardID, postID, root, context
+      ,
+        responseType: 'json'
+        withCredentials: url.archive.withCredentials
+      return true
+    else if Conf['Allow Mixed Content from Archives']
+      CrossOrigin.json url, (response) ->
+        Get.parseArchivedPost response, boardID, postID, root, context
+      return true
+    return false
+  parseArchivedPost: (data, boardID, postID, root, context) ->
     # In case of multiple callbacks for the same request,
     # don't parse the same original post more than once.
     if post = g.posts["#{boardID}.#{postID}"]
       Get.insert post, root, context
       return
 
-    data = req.response
     if data.error
       $.addClass root, 'warning'
       root.textContent = data.error

src/Images/ImageCommon.coffee

@@ -12,7 +12,7 @@ ImageCommon =
     URL = Redirect.to 'file',
       boardID:  post.board.ID
       filename: src[src.length - 1]
-    unless URL and (/^https:\/\//.test(URL) or location.protocol is 'http:')
+    unless URL and Redirect.securityCheck URL
       URL = null
 
     return cb URL if (post.isDead or post.file.isDead) and file.src.split('/')[2] is 'i.4cdn.org'