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proxy.go
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proxy.go
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// Copyright 2014 Jack Wakefield
//
// 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.
package main
import (
"errors"
"net/http"
"net/url"
"strings"
"github.com/jackwakefield/gopac"
)
var errorProxyRetrieval = errors.New("unable to retrieve proxy")
func newProxyClient(parser *gopac.Parser) *http.Client {
return &http.Client{Transport: &http.Transport{
Proxy: func(req *http.Request) (*url.URL, error) {
// retrieve the proxy entry for the requested URL and host
entry, err := parser.FindProxy(req.URL.String(), req.URL.Host)
if err == nil {
// strip the PROXY prefix, the server delimiter, and then split
// the entry to retrieve an array of proxy servers to be used for
// the request
entry = strings.Replace(entry, "PROXY ", "", -1)
entry = strings.Replace(entry, "; ", "", -1)
hosts := strings.Split(entry, " ")
// ensure a proxy server was found
if len(hosts) > 0 && hosts[0] != "" {
// return the proxy server to be used to load the request
return url.Parse("http://" + hosts[0])
}
}
return nil, errorProxyRetrieval
},
}}
}