通过http使用grails

时间:2017-09-19 22:05:24

标签: http grails safari video-streaming mp4

我正在使用旧的Grails 2.5.1应用程序,我注意到服务器提供的mp4视频文件无法在Safari中播放。我在SO上查找了这个问题并得到了一些提示,它与范围标题有关。但我怀疑我处理范围标题的方式并不完全正确。

到目前为止,我发现的是Mac OS Safari 11.0(11604.1.38.1.7)(我现在不关心ios Safari)发送两个GET请求。首先,它发送一个:

host:     localhost:8080
accept:     text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
user-agent:     Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38
accept-language:     en-us
accept-encoding:     gzip, deflate
x-request-time:     t=****
x-forwarded-for:     *.*.*.*
x-forwarded-host:     *.com
x-forwarded-server:     *.com
connection:     Keep-Alive
cookie: ...TOO BIG TO SHOW HERE
<- "GET /.../videos/lol.mp4 HTTP/1.1" 200 186ms 

随后,它发送第二个GET请求:

host:     localhost:8080
language:     en-us
playback-session-id:     03F1B4E6-F97E-****
bytes=0-1
accept:     */*
user-agent:     Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38
https://.../videos/lol.mp4
encoding:     identity
request-time:     t=****
forwarded-for:     *.*.*.*
forwarded-host:     *.com
forwarded-server:     *.com
connection:     Keep-Alive
cookie: ...TOO BIG TO SHOW HERE
<- "GET /uiv2/videos/lol.mp4 HTTP/1.1" 206 149ms

调试这个很难,因为Safari Web检查器不会显示太多内容。事实上,它甚至没有显示它发送的所有标题,所以我必须从后端获取它。

可以看出,请求1和2之间的区别在于第二个具有回放会话ID和范围。

困难的部分是找出如何取悦Safari以及如何处理范围和回放会话ID。

我已经让控制器返回请求的字节范围,如果它们被请求的话。但仍然没有运气。

import grails.compiler.GrailsTypeChecked
import grails.plugin.springsecurity.annotation.Secured
import asset.pipeline.grails.AssetResourceLocator
import grails.util.BuildSettings
import org.codehaus.groovy.grails.commons.GrailsApplication
import org.springframework.core.io.Resource

class VideoController {
    GrailsApplication grailsApplication
    AssetResourceLocator assetResourceLocator

    public index() {
        Resource mp4Resource = assetResourceLocator.findAssetForURI('/../lol.mp4');

        response.addHeader("Content-type", "video/mp4")
        response.addHeader( 'Accept-Ranges', 'bytes')

        String range = request.getHeader('range')
        if(range) {
            String[] rangeKeyValue = range.split('=')
            String[] rangeEnds = rangeKeyValue[1].split('-')
            if(rangeEnds.length  > 1) {
                int startByte = Integer.parseInt(rangeEnds[0])
                int endByte = Integer.parseInt(rangeEnds[1])
                int contentLength = (endByte - startByte) + 1
                byte[] inputBytes = new byte[contentLength]
                mp4Resource.inputStream.read(inputBytes, startByte, contentLength)
                response.status = 206
                response.addHeader( 'Content-Length', "${contentLength}")
                response.outputStream << inputBytes

            } else {
                response.addHeader( 'Content-Length', "${mp4Resource.contentLength()}")
                response.outputStream << mp4Resource.inputStream
            }
        } else {
            log.info 'no range, so responding with whole mp4'
            response.addHeader( 'Content-Length', "${mp4Resource.contentLength()}")
            response.outputStream << mp4Resource.inputStream
        }
    }
}

在Safari控制台中,我得到:

Failed to load resource: Plug-in handled load

没有别的。遗憾的是,Web检查器中的许多字段都是空白的,即使它们显然已设置在服务器中。

enter image description here

我已经尝试了很多这样的事情,任何帮助,指示,提示将不胜感激。谢谢你们:)!

1 个答案:

答案 0 :(得分:1)

在尝试了许多事情并搜索了许多帖子后,这个公式起作用了。你需要所有这四个标题。不需要在第一个请求中返回任何内容。这可能不适用于所有浏览器,但这适用于safari。其他修改可以确保处理所有浏览器

class VideoController {
    GrailsApplication grailsApplication
    AssetResourceLocator assetResourceLocator

    public index() {
        Resource mp4Resource = assetResourceLocator.findAssetForURI('/../lol.mp4')

        String range = request.getHeader('range')
        if(range) {
            String[] rangeKeyValue = range.split('=')
            String[] rangeEnds = rangeKeyValue[1].split('-')
            if(rangeEnds.length  > 1) {
                int startByte = Integer.parseInt(rangeEnds[0])
                int endByte = Integer.parseInt(rangeEnds[1])
                int contentLength = (endByte - startByte) + 1
                byte[] inputBytes = new byte[contentLength]
                def inputStream = mp4Resource.inputStream
                inputStream.skip(startByte) // input stream always starts at the first byte, so skip bytes until you get to the start of the requested range
                inputStream.read(inputBytes, 0, contentLength) // read from the first non-skipped byte
                response.reset() // Clears any data that exists in the buffer as well as the status code and headers
                response.status = 206
                response.addHeader("Content-Type", "video/mp4")
                response.addHeader( 'Accept-Ranges', 'bytes')
                response.addHeader('Content-Range', "bytes ${startByte}-${endByte}/${mp4Resource.contentLength()}")
                response.addHeader( 'Content-Length', "${contentLength}")
                response.outputStream << inputBytes
            }
        }
    }
}