Core: File Server


Overview


> curl localhost:8080/simple.html -v

*   Trying ::1...
* connect to ::1 port 8080 failed: Connection refused
*   Trying 127.0.0.1...
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET /simple.html HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.43.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Last-Modified: Fri Jun 12 2015 02:51:29 GMT-0700 (PDT)
< Cache-Control: max-age=60, must-revalidate, public
< Expires: Sun, 15 Nov 2015 02:07:46 GMT
< Content-Type: text/html
< Access-Control-Allow-Headers: Content-Type
< Access-Control-Allow-Methods: HEAD, GET, POST, PUT, PATCH, DELETE, OPTIONS, TRACE
< Access-Control-Allow-Origin: *
< X-Powered-By: actionhero API
< Set-Cookie: sessionID=d4453f54ff066a2ef078e5c80f18dc78a81f44ff;path=/;expires=Sun, 15 Nov 2015 03:06:46 GMT;
< Content-Length: 101
< Date: Sun, 15 Nov 2015 02:06:46 GMT
< Connection: keep-alive
<
* Connection #0 to host localhost left intact

<h1>ActionHero</h1>
I am a flat file being served to you via the API from ./public/simple.html<br />

ActionHero comes with a file server which clients can make use of to request files on the ActionHero server. ActionHero is not meant to be a 'rendering' server (like express or rails), but can serve static files.

If a directory is requested rather than a file, ActionHero will look for the file in that directory defined by api.config.commonWeb.directoryFileType (which defaults to index.html). Failing to find this file, an error will be returned defined in api.config.general.flatFileIndexPageNotFoundMessage

You can use the api.staticFile.get(connection, next) in your actions (where next(connection, error, fileStream, mime, length)). Note that fileStream is a stream which can be pipe'd to a client. You can use this in actions if you wish,

On .nix operating system's symlinks for both files and folders will be followed.


Web Clients


  • Cache-Control and Expires or respectively ETag headers (depending on configuration) will be sent with it's caching or revalidation time defined by api.config.servers.web.flatFileCacheDuration
  • Content-Types for files will attempt to be determined using the mime package
  • web clients may request connection.params.file directly within an action which makes use of api.sendFile, or if they are under the api.config.servers.web.urlPathForFiles route, the file will be looked up as if the route matches the directory structure under flatFileDirectory.
  • if your action wants to send content down to a client directly, you will do so like this server.sendFile(connection, null, stream, 'text/html', length);

Non-Web clients


  • the param file should be used to request a path
  • file data is sent raw, and is likely to contain binary content and line breaks. Parse your responses accordingly!

Files from Actions


// success case
data.connection.sendFile('/path/to/file.mp3');
data.toRender = false;
next();

// failure case
data.connection.rawConnection.responseHttpCode = 404;
data.connection.sendFile('404.html');
data.toRender = false;
next();

You can send files from within actions using connection.sendFile().

Note that you can optionally modify responseCodes (for HTTP clients only). Be sure to set toRender = false in the callback, as you have already sent data to the client, and probably don't want to do so again on a file request. If you try to sendFile on a path that doesn't exist (within your public directory), the 404 header will be handled automatically for you.


Customizing the File Server


// in an initializer, override api.staticFile.path

api.staticFile.path = function(connection){
  if(connection.action == 'sendFile'){
    return '/tmp/uploads';
  }else{
    return api.config.general.paths.public[0];
  }
}

By default, we want ActionHero's file server to be very locked-down, and only serve files from directories defined in api.config.general.paths.public. This is the safest default for beginners. However, you can customize things by changing the behavior of api.staticFile.path().

This would serve files from /public for all requests except the sendFile action, which will serve files from /tmp