bitmessage-js/docs/user-agent.js.html
Kagami Hiiragi fffa8c80d1 Publish docs
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<h1 class="page-title">Source: user-agent.js</h1>
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<pre class="prettyprint source linenums"><code>/**
* Working with Bitmessage user agents.
* @see {@link https://bitmessage.org/wiki/User_Agent}
* @module bitmessage/user-agent
*/
"use strict";
var var_str = require("./structs").var_str;
var BM_NAME = require("../package.json").name;
var BM_VERSION = require("../package.json").version;
/**
* User agent of the bitmessage library itself.
* @constant {Object[]}
* @static
*/
var SELF = exports.SELF = [{name: BM_NAME, version: BM_VERSION}];
/**
* Decode user agent's `var_str`. Just an alias for
* [var_str.decode]{@link module:bitmessage/structs.var_str.decode}.
* @function
*/
exports.decode = var_str.decode;
/**
* Parse raw user agent into software stack list. Most underlying
* software comes first.
* NOTE: Decoding is rather loose, it won't fail on bad user agent
* format because it's not that important.
* @param {string} str - Raw user agent string
* @return {Object[]} Parsed user agent.
*/
exports.parse = function(str) {
var software = [];
if (str.length > 2 &amp;&amp; str[0] === "/" &amp;&amp; str[str.length - 1] === "/") {
software = str.slice(1, -1).split("/");
software = software.map(function(str) {
// That's more readable than /([^:]*)(?::([^(]*)(?:\(([^)]*))?)?/
var soft = {name: str};
var semicolon = soft.name.indexOf(":");
if (semicolon !== -1) {
soft.version = soft.name.slice(semicolon + 1);
soft.name = soft.name.slice(0, semicolon);
var obracket = soft.version.indexOf("(");
if (obracket !== -1) {
soft.comments = soft.version.slice(obracket + 1);
soft.version = soft.version.slice(0, obracket);
var cbracket = soft.comments.indexOf(")");
if (cbracket !== -1) {
soft.comments = soft.comments.slice(0, cbracket);
}
}
}
return soft;
});
}
return software;
};
/**
* Encode user agent into `var_str` Buffer. Most underlying software
* comes first.
* @param {(Object[]|string[]|string|Buffer)} software - List of
* software to encode or just raw user agent string/Buffer
* @return {Buffer} Encoded user agent.
* @function
* @static
*/
var encode = exports.encode = function(software) {
var ua;
if (Array.isArray(software)) {
ua = software.map(function(soft) {
if (typeof soft === "string") {
return soft;
}
var version = soft.version || "0.0.0";
var str = soft.name + ":" + version;
if (soft.comments) {
str += "(" + soft.comments + ")";
}
return str;
}).join("/");
ua = "/" + ua + "/";
} else if (Buffer.isBuffer(software)) {
return software;
} else {
ua = software;
}
return var_str.encode(ua);
};
/**
* Encode user agent of bitmessage library.
* @return {Buffer} Encoded user agent.
*/
exports.encodeSelf = function() {
return encode(SELF);
};
/**
* Encode user agent with user agent of bitmessage library underneath.
* Most underlying software comes first.
* @param {(Object[]|string[]|Object|string)} software - List of
* software to encode
* @return {Buffer} Encoded user agent.
*/
exports.encodeSelfWith = function(software) {
software = SELF.concat(software);
return encode(software);
};
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