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111 lines
2.9 KiB
111 lines
2.9 KiB
1 month ago
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var fs = require('fs'),
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url = require('url'),
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stream = require('stream');
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function resolve_url(href, base) {
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if (url.URL)
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return new url.URL(href, base);
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// older Node version (< v6.13)
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return base ? url.resolve(base, href) : href;
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}
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function host_and_ports_match(url1, url2) {
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if (url1.indexOf('http') < 0) url1 = 'http://' + url1;
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if (url2.indexOf('http') < 0) url2 = 'http://' + url2;
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var a = url.parse(url1), b = url.parse(url2);
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return a.host == b.host
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&& String(a.port || (a.protocol == 'https:' ? 443 : 80))
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== String(b.port || (b.protocol == 'https:' ? 443 : 80));
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}
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// returns false if a no_proxy host or pattern matches given url
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function should_proxy_to(uri) {
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var no_proxy = get_env_var(['NO_PROXY'], true);
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if (!no_proxy) return true;
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// previous (naive, simple) strategy
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// var host, hosts = no_proxy.split(',');
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// for (var i in hosts) {
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// host = hosts[i];
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// if (host_and_ports_match(host, uri)) {
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// return false;
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// }
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// }
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var pattern, pattern_list = no_proxy.split(/[\s,]+/);
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for (var i in pattern_list) {
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pattern = pattern_list[i];
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if (pattern.trim().length == 0) continue;
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// replace leading dot by asterisk, escape dots and finally replace asterisk by .*
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var regex = new RegExp(pattern.replace(/^\./, "*").replace(/[.]/g, '\\$&').replace(/\*/g, '.*'))
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if (uri.match(regex)) return false;
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}
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return true;
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}
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function get_env_var(keys, try_lower) {
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var val, i = -1, env = process.env;
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while (!val && i < keys.length-1) {
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val = env[keys[++i]];
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if (!val && try_lower) {
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val = env[keys[i].toLowerCase()];
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}
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}
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return val;
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}
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function parse_content_type(header) {
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if (!header || header === '') return {};
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var found, charset = 'utf8', arr = header.split(';');
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if (arr.length > 1 && (found = arr[1].match(/charset=(.+)/)))
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charset = found[1];
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return { type: arr[0], charset: charset };
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}
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function is_stream(obj) {
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return typeof obj.pipe === 'function';
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}
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function get_stream_length(stream, given_length, cb) {
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if (given_length > 0)
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return cb(given_length);
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if (stream.end !== void 0 && stream.end !== Infinity && stream.start !== void 0)
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return cb((stream.end + 1) - (stream.start || 0));
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fs.stat(stream.path, function(err, stat) {
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cb(stat ? stat.size - (stream.start || 0) : null);
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});
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}
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function pump_streams(streams, cb) {
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if (stream.pipeline)
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return stream.pipeline.apply(null, streams.concat(cb));
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var tmp = streams.shift();
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while (streams.length) {
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tmp = tmp.pipe(streams.shift());
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tmp.once('error', function(e) {
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cb && cb(e);
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cb = null;
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})
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}
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}
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module.exports = {
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resolve_url: resolve_url,
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get_env_var: get_env_var,
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host_and_ports_match: host_and_ports_match,
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should_proxy_to: should_proxy_to,
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parse_content_type: parse_content_type,
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is_stream: is_stream,
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get_stream_length: get_stream_length,
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pump_streams: pump_streams
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}
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