截取/处理MIME类型/文件

问题描述

如何禁用.torrent文件/内容类型应用程序/ x-bittorrent的默认动作（例如打开对话框或运行程序），而不是处理扩展名中的数据？

这是你怎么做的IF mime类型已经存在。如果它不存在，我不知道如何添加它，可能是一些注册函数。

出于某种原因，我的类型 s是 application / x-download 我不知道为什么。如果你想知道我是怎么想出来的，那么我会告诉你。所以在下面的例子中，我使用它作为文件类型。

当我们 console.log（wrappedHandlerInfo）它看起来像这样：

现在让我们来枚举所有的应用程序处理程序（我从这里得到这个：

  235 addPossibleApplicationHandler：function（aNewHandler）{
 236 var possibleApps = this.possibleApplicationHandlers.enumerate（）; 
 237 while（possibleApps.hasMoreElements（））{
 238 if（possibleApps.getNext（）。equals（aNewHandler））
 239 return; 
 240} 
 241 this.possibleApplicationHandlers.appendElement（aNewHandler，false）; 
 242}，
 243 
  

这是 addPossibleApplicationHandler ，我们可能只需要复制它并编辑。

2014年8月3日更新

好的，这是如何添加协议处理程序（它只增加了一个nsIWebAppHandler，但我确定添加一个nsIAppHandler的本地含义，它应该是相似的，只需要uri param：

$ b

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可用于 nsIMIMEService 中的函数：MXR :: nsIMIMEService.idl

How do you disable the default action for .torrent files/content-type application/x-bittorrent(eg open with dialog or run program) and instead handle the data in a extension?

解决方案

Based on @nmaiers post this is how you do it:

This is how you do it IF the mime type already exists. If it doesn't exist I don't know how to add it, probably some register function.

For some reason the type for my torrents is application/x-download I have no idea why. If you want info on how I figured that out than I'll tell you. So in the example below I use that as file type.

When we console.log(wrappedHandlerInfo) we see that it looks like this:

so now let's do that enumerate all application handlers (i got this from here: MXR :: gApplicationsPane, and if .type == 'application/x-download' let'sbreak` so we can than play with that object.

var handlerService = Cc['@mozilla.org/uriloader/handler-service;1'].getService(Ci.nsIHandlerService);

var listOfWrappedHandlers = handlerService.enumerate();
var i = 0;
while (listOfWrappedHandlers.hasMoreElements()) {
  var wrappedHandlerInfo = listOfWrappedHandlers.getNext().QueryInterface(Ci.nsIHandlerInfo);
  console.log(i, 'handler for', wrappedHandlerInfo.type, wrappedHandlerInfo);
  if (wrappedHandlerInfo.type == 'application/x-download') {
    break;
  }
  i++;
}
console.log('Listed ', i, ' handlers');
console.log('wrappedHandlerInfo=', wrappedHandlerInfo); //should be the application/x-download one as we broke the loop once it found that

now we have to set its properties then save it.

// Change and save mime handler settings.
wrappedHandlerInfo.alwaysAskBeforeHandling = false;
wrappedHandlerInfo.preferredAction = Ci.nsIHandlerInfo.handleInternally;
handlerService.store(wrappedHandlerInfo);

I'm not sure what to change those properties too though, maybe @nmaier can advise us on that.

We see here on MXR :: nsIHandlerService.idl #L69 that store does this:

69    * Save the preferred action, preferred handler, possible handlers, and
70    * always ask properties of the given handler info object to the datastore.
71    * Updates an existing record or creates a new one if necessary.
72    *
73    * Note: if preferred action is undefined or invalid, then we assume
74    * the default value nsIHandlerInfo::useHelperApp.
75    *
76    * @param aHandlerInfo  the handler info object
77    */
78   void store(in nsIHandlerInfo aHandlerInfo);

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ANOTHER WAY

Ok i found an even better way, this way you don't need to loop to find the handler.

Do this:

var mimeService = Cc['@mozilla.org/mime;1'].getService(Ci.nsIMIMEService);
var CONTENT_TYPE = ''; //'application/x-download'; can leave this blank
var TYPE_EXTENSION = 'torrent';

var handlerInfo = mimeService.getFromTypeAndExtension(CONTENT_TYPE, TYPE_EXTENSION);
console.info('handlerInfo:', handlerInfo); //http://i.imgur.com/dUKox24.png

    // Change and save mime handler settings.
    handlerInfo.alwaysAskBeforeHandling = false;
    handlerInfo.preferredAction = Ci.nsIHandlerInfo.handleInternally;
    handlerService.store(handlerInfo);

This handlerInfo object is slightly different in that it has a primaryExtension attribute which holds torrent.

---

Problem with both ways

The problem with both ways is that, if the mime type doesn't exist, you have to register it somehow, I don't know how. Probably use mime service and some register function.

Update August 3rd 2014

I think i found a solution for the problem mentioned in bullet above (problem with both ways).

MXR :: addPossibleApplicationHandler

235   addPossibleApplicationHandler: function(aNewHandler) {
236     var possibleApps = this.possibleApplicationHandlers.enumerate();
237     while (possibleApps.hasMoreElements()) {
238       if (possibleApps.getNext().equals(aNewHandler))
239         return;
240     }
241     this.possibleApplicationHandlers.appendElement(aNewHandler, false);
242   },
243

This is code for addPossibleApplicationHandler, we probably just need to copy that and edit somehow.

Update August 3rd 2014

Ok this is how to add protocol handler (it only adds a nsIWebAppHandler but im sure to add a local meaning a nsIAppHandler it should be similar just no need for uri param:

https://gist.github.com/Noitidart/2faaac70c62bc13e7773#add-a-handler-to-a-protocol

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Info on functions available in nsIMIMEService: MXR :: nsIMIMEService.idl

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