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taichikuji/README.md

Created August 17, 2020 21:41
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steamcommunity output js file
Raw
README.md

Explanation

I will explain what is this about, and then I'll add the output file I got. On the day 17 of August of 2020, at around 23:20 CEST, steampowered.com, steamcommunity.com and support.steamcommunity.com went down, but not completely.

While playing around with the sites while all of this is happening, something interesting happened, and I saved the code just in case.

First file I got was the steamcommunity.js file while trying to access my own steam profile (It quickly got "fixed" and now it does not display anything).

Second file is just a generic html to explain that the site could not load properly because the site was down.

Raw
steamcommunity.html
<!DOCTYPE html>
<html>
<head>
<title>Sorry!</title>
</head>
<body style="background-color: #000000; color: #ffffff;font-family: Arial, Helvetica, sans-serif; font-size: 12px; background-image: url( 'http://cdn.store.steampowered.com/public/images/v5/content_bg.png'); background-repeat: repeat-x; background-position: top;) ">
<div style="width: 940px; margin: 16px auto;">
<img src="http://cdn.store.steampowered.com/public/images/v5/globalheader_logo.png" style="float: right; margin-top: 30px;">
<br><h1>Sorry</h1>
<h2>The site is currently unavailable. Please try again later.</h2>
</div>
</body>
</html>
Raw
steamcommunity.js
/**
* Copyright 2017 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Significantly modified by Valve to work as an audio worklet not a ScriptProcessorNode!
*/
class CNoiseGateProcessor extends AudioWorkletProcessor {
static get parameterDescriptors()
{
return [
{ name: 'attack', defaultValue: 2.0 },
{ name: 'release', defaultValue: 0.01 },
{ name: 'threshold', defaultValue: -80 },
{ name: 'sampleRate', defaultValue: 48000 },
];
}
constructor()
{
super();
}
process( inputs, outputs, parameters )
{
let bReInit = false;
if ( this.parameters == undefined )
{
this.parameters = new Object();
this.parameters.attack = parameters.attack[0];
this.parameters.release = parameters.release[0];
this.parameters.threshold = parameters.threshold[0];
this.parameters.bufferSize = inputs[0][0].length; // Should always be 128, but make sure we adjust to make sure
this.parameters.sampleRate = parameters.sampleRate[0];
bReInit = true;
this.port.postMessage( "NoiseGate setup: " + JSON.stringify( this.parameters ) );
this.port.postMessage( "Inputs: " + inputs.length + " channels: " + inputs[0].length + " samples: " + inputs[0][0].length );
this.port.postMessage( "Outputs: " + outputs.length + " channels: " + outputs[0].length + " samples: " + outputs[0][0].length );
}
if ( this.parameters.attack != parameters.attack[0] )
{
this.parameters.attack = parameters.attack[0];
}
if ( this.parameters.release != parameters.release[0] )
{
this.parameters.release = parameters.release[0];
}
if ( this.parameters.threshold != parameters.threshold[0] )
{
this.parameters.threshold = parameters.threshold[0];
}
if ( this.parameters.bufferSize != inputs[0][0].length )
{
this.parameters.bufferSize = parameters.bufferSize[0];
bReInit = true;
}
if ( this.parameters.sampleRate != parameters.sampleRate[0] )
{
this.parameters.sampleRate = parameters.sampleRate[0];
bReInit = true;
}
if ( bReInit )
{
this.port.postMessage( "Noise gate had to re-initialize due to parameters changing" );
// The time constant of the filter has been set experimentally to balance
// roughly delay for high frequency suppression.
let timeConstant = 0.0025;
// Alpha controls a tradeoff between the smoothness of the
// envelope and its delay, with a higher value giving more smoothness at
// the expense of delay and vice versa.
this.alpha_ = this.getAlphaFromTimeConstant_( timeConstant, this.parameters.sampleRate );
// The previous envelope level, a float representing signal amplitude.
this.previousLevel_ = 0;
// The last weight (between 0 and 1) assigned, where 1 means the gate
// is open and 0 means it is closed and the sample in the output buffer is
// muted. When attacking, the weight will linearly decrease from 1 to 0, and
// when releasing the weight linearly increase from 0 to 1.
this.previousWeight_ = 1.0;
this.channelIndex = 0;
this.channel_ = new Float32Array( this.parameters.bufferSize );
this.envelope_ = new Float32Array (this.parameters.bufferSize );
this.weights_ = new Float32Array( this.parameters.bufferSize );
}
let channel0 = inputs[0][0];
let numChannels = inputs[0].length;
//console.log( "Level: " + channel0[0] );
for( let i=0; i < channel0.length; ++i )
{
let val = channel0[i];
// More than one channel, take max channel value for each input
for( let iChan = 1; iChan < numChannels; ++iChan )
{
val = Math.max( val, inputs[0][iChan][i] );
}
this.channel_[this.channelIndex] = val;
this.channelIndex++;
// wrap around if needed to where we are copying
if ( this.channelIndex >= this.parameters.bufferSize )
this.channelIndex = 0;
}
this.detectLevel_();
this.computeWeights_();
let input = inputs[0];
for( let iOutput = 0; iOutput < outputs.length; ++iOutput )
{
let output = outputs[iOutput];
for ( let channel = 0; channel < input.length; ++channel )
{
let inputChannel = input[channel];
let outputChannel = output[channel];
for ( let i = 0; i < inputChannel.length; ++i )
{
let weight = this.weights_[i];
if ( weight < 0.2 && !this.m_bWasLastCutting )
{
this.m_bWasLastCutting = true;
this.m_bWasLastOpen = false;
this.port.postMessage( "Mic input below threshold, cutting output." );
}
else if ( weight >= 0.9 && !this.m_bWasLastOpen )
{
this.port.postMessage( "Mic input now above threshold." );
this.m_bWasLastOpen = true;
this.m_bWasLastCutting = false;
}
outputChannel[i] = inputChannel[i] * weight;
}
}
}
// To keep processor alive!
return true;
}
detectLevel_()
{
// The signal level is determined by filtering the square of the signal
// with exponential smoothing. See
// http://www.aes.org/e-lib/browse.cfm?elib=16354 for details.
this.envelope_[0] = this.alpha_ * this.previousLevel_ +
(1 - this.alpha_) * Math.pow(this.channel_[0], 2);
for (let j = 1; j < this.parameters.bufferSize; j++)
{
this.envelope_[j] = this.alpha_ * this.envelope_[j-1] +
(1 - this.alpha_) * Math.pow(this.channel_[j], 2);
}
this.previousLevel_ = this.envelope_[this.parameters.bufferSize-1];
//console.log ( "startIndex " + startIndex + " PreviousLevel: " + this.previousLevel_ );
}
computeWeights_()
{
// When attack or release are 0, the weight changes between 0 and 1
// in one step.
let attackSteps = 1;
let releaseSteps = 1;
let attackLossPerStep = 1;
let releaseGainPerStep = 1;
// TODO: Replace this weights-based approach for enabling attack/release
// parameters with the method described on page 22 in
// "Signal Processing Techniques for Digital Audio Effects".
// When attack or release are > 0, the associated weight changes between 0
// and 1 in the number of steps corresponding to the millisecond attack
// or release time parameters.
if (this.parameters.attack > 0)
{
attackSteps = Math.ceil(this.parameters.sampleRate * this.parameters.attack);
attackLossPerStep = 1 / attackSteps;
}
if (this.parameters.release > 0)
{
releaseSteps = Math.ceil(this.parameters.sampleRate * this.parameters.release);
releaseGainPerStep = 1 / releaseSteps;
}
/*
let firstVal = CNoiseGateProcessor.toDecibel(2 * this.envelope_[0]);
if ( firstVal < this.parameters.threshold )
{
console.log( firstVal + " is less than " + this.parameters.threshold );
}
else
{
console.log( firstVal + " is not less than " + this.parameters.threshold );
}
*/
// Compute an array of weights between 0 and 1 which will be multiplied with
// the channel depending on if the noise gate is open, attacking, releasing,
// or closed.
for ( let i = 0; i < this.parameters.bufferSize; i++ )
{
// For sine waves, the envelope eventually reaches an average power of
// a^2 / 2. Sine waves are therefore scaled back to the original
// amplitude, but other waveforms or constant sources can only be
// approximated.
const scaledEnvelopeValue = CNoiseGateProcessor.toDecibel(2 * this.envelope_[i]);
if (scaledEnvelopeValue < this.parameters.threshold)
{
const weight = this.previousWeight_ - attackLossPerStep;
this.weights_[i] = Math.max(weight, 0);
}
else
{
const weight = this.previousWeight_ + releaseGainPerStep;
this.weights_[i] = Math.min(weight, 1);
}
this.previousWeight_ = this.weights_[i];
}
}
getAlphaFromTimeConstant_(timeConstant, sampleRate) {
return Math.exp(-1 / (sampleRate * timeConstant));
}
static toDecibel(powerLevel) {
return 10 * Math.log10(powerLevel);
}
}
registerProcessor( 'noisegate-processor', CNoiseGateProcessor );
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