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handlers.js
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handlers.js
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(function(){
function getEntryFile( entry, callback ) {
var cacheKey = entry.filesystem.name + '/' + entry.fullPath
var inCache = entryFileCache.get(cacheKey)
if (inCache) {
//console.log('file cache hit');
callback(inCache); return }
entry.file( function(file) {
entryFileCache.set(cacheKey, file)
callback(file)
}, function(evt) {
console.error('entry.file() error',evt)
debugger
})
}
function DirectoryEntryHandler(request) {
BaseHandler.prototype.constructor.call(this)
//this.debugInterval = setInterval( this.debug.bind(this), 1000)
this.entry = null
this.file = null
this.readChunkSize = 4096 * 16
this.fileOffset = 0
this.fileEndOffset = 0
this.bodyWritten = 0
this.isDirectoryListing = false
request.connection.stream.onclose = this.onClose.bind(this)
}
_.extend(DirectoryEntryHandler.prototype, {
onClose: function() {
//console.log('closed',this.request.path)
clearInterval(this.debugInterval)
},
debug: function() {
//console.log(this.request.connection.stream.sockId,'debug wb:',this.request.connection.stream.writeBuffer.size())
},
head: function() {
this.get()
},
get: function() {
//this.request.connection.stream.onWriteBufferEmpty = this.onWriteBufferEmpty.bind(this)
this.setHeader('accept-ranges','bytes')
this.setHeader('connection','keep-alive')
if (! window.fs) {
this.write("error: need to select a directory to serve",500)
return
}
//var path = decodeURI(this.request.path)
// strip '/' off end of path
fs.getByPath(this.request.path, this.onEntry.bind(this))
},
doReadChunk: function() {
//console.log(this.request.connection.stream.sockId, 'doReadChunk', this.fileOffset)
var reader = new FileReader;
var endByte = Math.min(this.fileOffset + this.readChunkSize,
this.fileEndOffset)
if (endByte >= this.file.size) {
console.error('bad readChunk')
console.assert(false)
}
//console.log('doReadChunk',this.fileOffset,endByte-this.fileOffset)
reader.onload = this.onReadChunk.bind(this)
reader.onerror = this.onReadChunk.bind(this)
var blobSlice = this.file.slice(this.fileOffset, endByte + 1)
var oldOffset = this.fileOffset
this.fileOffset += (endByte - this.fileOffset) + 1
//console.log('offset',oldOffset,this.fileOffset)
reader.readAsArrayBuffer(blobSlice)
},
onWriteBufferEmpty: function() {
if (! this.file) {
console.error('!this.file')
debugger
return
}
console.assert( this.bodyWritten <= this.responseLength )
//console.log('onWriteBufferEmpty', this.bodyWritten, '/', this.responseLength)
if (this.bodyWritten > this.responseLength) {
console.assert(false)
} else if (this.bodyWritten == this.responseLength) {
this.request.connection.stream.onWriteBufferEmpty = null
this.finish()
return
} else {
if (this.request.connection.stream.remoteclosed) {
this.request.connection.close()
// still read?
} else if (! this.request.connection.stream.closed) {
this.doReadChunk()
}
}
},
onReadChunk: function(evt) {
//console.log('onReadChunk')
if (evt.target.result) {
this.bodyWritten += evt.target.result.byteLength
if (this.bodyWritten >= this.responseLength) {
//this.request.connection.stream.onWriteBufferEmpty = null
}
//console.log(this.request.connection.stream.sockId,'write',evt.target.result.byteLength)
this.request.connection.write(evt.target.result)
} else {
console.error('onreadchunk error',evt.target.error)
this.request.connection.close()
}
},
onEntry: function(entry) {
this.entry = entry
if (this.entry && this.entry.isDirectory && ! this.request.origpath.endsWith('/')) {
var newloc = this.request.origpath + '/'
this.setHeader('location', newloc) // XXX - encode latin-1 somehow?
this.responseLength = 0
//console.log('redirect ->',newloc)
this.writeHeaders(301)
this.finish()
return
}
if (this.request.connection.stream.closed) {
console.warn(this.request.connection.stream.sockId,'request closed while processing request')
return
}
if (! entry) {
if (this.request.method == "HEAD") {
this.responseLength = 0
this.writeHeaders(404)
this.finish()
} else {
this.write('no entry',404)
}
} else if (entry.error) {
if (this.request.method == "HEAD") {
this.responseLength = 0
this.writeHeaders(404)
this.finish()
} else {
this.write('entry not found',404)
}
} else if (entry.isFile) {
this.renderFileContents(entry)
} else {
// directory
var reader = entry.createReader()
var allresults = []
this.isDirectoryListing = true
function onreaderr(evt) {
entryCache.unset(this.entry.filesystem.name + this.entry.fullPath)
console.error('error reading dir',evt)
this.request.connection.close()
}
function alldone(results) {
if (this.app.opts.renderIndex) {
for (var i=0; i<results.length; i++) {
if (results[i].name == 'index.html') {
this.renderFileContents(results[i])
return
}
}
}
this.renderDirectoryListing(results)
}
function onreadsuccess(results) {
console.log('onreadsuccess',results.length)
if (results.length == 0) {
alldone.bind(this)(allresults)
} else {
allresults = allresults.concat( results )
reader.readEntries( onreadsuccess.bind(this),
onreaderr.bind(this) )
}
}
console.log('readentries')
reader.readEntries( onreadsuccess.bind(this),
onreaderr.bind(this))
}
},
renderFileContents: function(entry, file) {
getEntryFile(entry, function(file) {
this.file = file
if (this.request.method == "HEAD") {
this.responseLength = this.file.size
this.writeHeaders(200)
this.finish()
} else if (this.file.size > this.readChunkSize * 8 ||
this.request.headers['range']) {
this.request.connection.stream.onWriteBufferEmpty = this.onWriteBufferEmpty.bind(this)
if (this.request.headers['range']) {
console.log(this.request.connection.stream.sockId,'RANGE',this.request.headers['range'])
var range = this.request.headers['range'].split('=')[1].trim()
var rparts = range.split('-')
if (! rparts[1]) {
this.fileOffset = parseInt(rparts[0])
this.fileEndOffset = this.file.size - 1
this.responseLength = this.file.size - this.fileOffset;
this.setHeader('content-range','bytes '+this.fileOffset+'-'+(this.file.size-1)+'/'+this.file.size)
if (this.fileOffset == 0) {
this.writeHeaders(200)
} else {
this.writeHeaders(206)
}
} else {
//debugger // TODO -- add support for partial file fetching...
//this.writeHeaders(500)
this.fileOffset = parseInt(rparts[0])
this.fileEndOffset = parseInt(rparts[1])
this.responseLength = this.fileEndOffset - this.fileOffset + 1
this.setHeader('content-range','bytes '+this.fileOffset+'-'+(this.fileEndOffset)+'/'+this.file.size)
this.writeHeaders(206)
}
} else {
console.log('large file, streaming mode!')
this.fileOffset = 0
this.fileEndOffset = this.file.size - 1
this.responseLength = this.file.size
this.writeHeaders(200)
}
} else {
//console.log(entry,file)
var fr = new FileReader
var cb = this.onReadEntry.bind(this)
fr.onload = cb
fr.onerror = cb
fr.readAsArrayBuffer(file)
}
}.bind(this))
},
renderDirectoryListing: function(results) {
var html = ['<html>']
html.push('<style>li.directory {background:#aab}</style>')
html.push('<a href="..">parent</a>')
html.push('<ul>')
for (var i=0; i<results.length; i++) {
var name = _.escape(results[i].name)
if (results[i].isDirectory) {
html.push('<li class="directory"><a href="' + name + '/">' + name + '</a></li>')
} else {
html.push('<li><a href="' + name + '">' + name + '</a></li>')
}
}
html.push('</ul></html>')
this.setHeader('content-type','text/html')
this.setHeader('test-foo-bar','999')
this.write(html.join('\n'))
},
onReadEntry: function(evt) {
if (evt.type == 'error') {
console.error('error reading',evt.target.error)
// clear this file from cache...
entryFileCache.unset( this.entry.filesystem.name + '/' + this.entry.fullPath )
this.request.connection.close()
} else {
// set mime types etc?
this.write(evt.target.result)
}
}
}, BaseHandler.prototype)
window.DirectoryEntryHandler = DirectoryEntryHandler
})()