mirror of
https://github.com/iv-org/invidious.git
synced 2024-08-14 22:35:50 +00:00
201 lines
4.9 KiB
JavaScript
201 lines
4.9 KiB
JavaScript
/**
|
|
* Copyright (C) 2016 Maxime Petazzoni <maxime.petazzoni@bulix.org>.
|
|
* All rights reserved.
|
|
*/
|
|
|
|
var SSE = function (url, options) {
|
|
if (!(this instanceof SSE)) {
|
|
return new SSE(url, options);
|
|
}
|
|
|
|
this.INITIALIZING = -1;
|
|
this.CONNECTING = 0;
|
|
this.OPEN = 1;
|
|
this.CLOSED = 2;
|
|
|
|
this.url = url;
|
|
|
|
options = options || {};
|
|
this.headers = options.headers || {};
|
|
this.payload = options.payload !== undefined ? options.payload : '';
|
|
this.method = options.method || (this.payload && 'POST' || 'GET');
|
|
|
|
this.FIELD_SEPARATOR = ':';
|
|
this.listeners = {};
|
|
|
|
this.xhr = null;
|
|
this.readyState = this.INITIALIZING;
|
|
this.progress = 0;
|
|
this.chunk = '';
|
|
|
|
this.addEventListener = function(type, listener) {
|
|
if (this.listeners[type] === undefined) {
|
|
this.listeners[type] = [];
|
|
}
|
|
|
|
if (this.listeners[type].indexOf(listener) === -1) {
|
|
this.listeners[type].push(listener);
|
|
}
|
|
};
|
|
|
|
this.removeEventListener = function(type, listener) {
|
|
if (this.listeners[type] === undefined) {
|
|
return;
|
|
}
|
|
|
|
var filtered = [];
|
|
this.listeners[type].forEach(function(element) {
|
|
if (element !== listener) {
|
|
filtered.push(element);
|
|
}
|
|
});
|
|
if (filtered.length === 0) {
|
|
delete this.listeners[type];
|
|
} else {
|
|
this.listeners[type] = filtered;
|
|
}
|
|
};
|
|
|
|
this.dispatchEvent = function(e) {
|
|
if (!e) {
|
|
return true;
|
|
}
|
|
|
|
e.source = this;
|
|
|
|
var onHandler = 'on' + e.type;
|
|
if (this.hasOwnProperty(onHandler)) {
|
|
this[onHandler].call(this, e);
|
|
if (e.defaultPrevented) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (this.listeners[e.type]) {
|
|
return this.listeners[e.type].every(function(callback) {
|
|
callback(e);
|
|
return !e.defaultPrevented;
|
|
});
|
|
}
|
|
|
|
return true;
|
|
};
|
|
|
|
this._setReadyState = function (state) {
|
|
var event = new CustomEvent('readystatechange');
|
|
event.readyState = state;
|
|
this.readyState = state;
|
|
this.dispatchEvent(event);
|
|
};
|
|
|
|
this._onStreamFailure = function(e) {
|
|
this.dispatchEvent(new CustomEvent('error'));
|
|
this.close();
|
|
}
|
|
|
|
this._onStreamProgress = function(e) {
|
|
if (this.xhr.status !== 200 && this.readyState !== this.CLOSED) {
|
|
this._onStreamFailure(e);
|
|
return;
|
|
}
|
|
|
|
if (this.readyState == this.CONNECTING) {
|
|
this.dispatchEvent(new CustomEvent('open'));
|
|
this._setReadyState(this.OPEN);
|
|
}
|
|
|
|
var data = this.xhr.responseText.substring(this.progress);
|
|
this.progress += data.length;
|
|
data.split(/(\r\n|\r|\n){2}/g).forEach(function(part) {
|
|
if (part.trim().length === 0) {
|
|
this.dispatchEvent(this._parseEventChunk(this.chunk.trim()));
|
|
this.chunk = '';
|
|
} else {
|
|
this.chunk += part;
|
|
}
|
|
}.bind(this));
|
|
};
|
|
|
|
this._onStreamLoaded = function(e) {
|
|
this._onStreamProgress(e);
|
|
|
|
// Parse the last chunk.
|
|
this.dispatchEvent(this._parseEventChunk(this.chunk));
|
|
this.chunk = '';
|
|
};
|
|
|
|
/**
|
|
* Parse a received SSE event chunk into a constructed event object.
|
|
*/
|
|
this._parseEventChunk = function(chunk) {
|
|
if (!chunk || chunk.length === 0) {
|
|
return null;
|
|
}
|
|
|
|
var e = {'id': null, 'retry': null, 'data': '', 'event': 'message'};
|
|
chunk.split(/\n|\r\n|\r/).forEach(function(line) {
|
|
line = line.trimRight();
|
|
var index = line.indexOf(this.FIELD_SEPARATOR);
|
|
if (index <= 0) {
|
|
// Line was either empty, or started with a separator and is a comment.
|
|
// Either way, ignore.
|
|
return;
|
|
}
|
|
|
|
var field = line.substring(0, index);
|
|
if (!(field in e)) {
|
|
return;
|
|
}
|
|
|
|
var value = line.substring(index + 1).trimLeft();
|
|
if (field === 'data') {
|
|
e[field] += value;
|
|
} else {
|
|
e[field] = value;
|
|
}
|
|
}.bind(this));
|
|
|
|
var event = new CustomEvent(e.event);
|
|
event.data = e.data;
|
|
event.id = e.id;
|
|
return event;
|
|
};
|
|
|
|
this._checkStreamClosed = function() {
|
|
if (this.xhr.readyState === XMLHttpRequest.DONE) {
|
|
this._setReadyState(this.CLOSED);
|
|
}
|
|
};
|
|
|
|
this.stream = function() {
|
|
this._setReadyState(this.CONNECTING);
|
|
|
|
this.xhr = new XMLHttpRequest();
|
|
this.xhr.addEventListener('progress', this._onStreamProgress.bind(this));
|
|
this.xhr.addEventListener('load', this._onStreamLoaded.bind(this));
|
|
this.xhr.addEventListener('readystatechange', this._checkStreamClosed.bind(this));
|
|
this.xhr.addEventListener('error', this._onStreamFailure.bind(this));
|
|
this.xhr.addEventListener('abort', this._onStreamFailure.bind(this));
|
|
this.xhr.open(this.method, this.url);
|
|
for (var header in this.headers) {
|
|
this.xhr.setRequestHeader(header, this.headers[header]);
|
|
}
|
|
this.xhr.send(this.payload);
|
|
};
|
|
|
|
this.close = function() {
|
|
if (this.readyState === this.CLOSED) {
|
|
return;
|
|
}
|
|
|
|
this.xhr.abort();
|
|
this.xhr = null;
|
|
this._setReadyState(this.CLOSED);
|
|
};
|
|
};
|
|
|
|
// Export our SSE module for npm.js
|
|
if (typeof exports !== 'undefined') {
|
|
exports.SSE = SSE;
|
|
}
|