diff options
Diffstat (limited to 'vendor/golang.org/x/net/http/httpproxy/proxy.go')
| -rw-r--r-- | vendor/golang.org/x/net/http/httpproxy/proxy.go | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/vendor/golang.org/x/net/http/httpproxy/proxy.go b/vendor/golang.org/x/net/http/httpproxy/proxy.go deleted file mode 100644 index cbe1d2a..0000000 --- a/vendor/golang.org/x/net/http/httpproxy/proxy.go +++ /dev/null @@ -1,239 +0,0 @@ -// Copyright 2017 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// Package httpproxy provides support for HTTP proxy determination -// based on environment variables, as provided by net/http's -// ProxyFromEnvironment function. -// -// The API is not subject to the Go 1 compatibility promise and may change at -// any time. -package httpproxy - -import ( - "errors" - "fmt" - "net" - "net/url" - "os" - "strings" - "unicode/utf8" - - "golang.org/x/net/idna" -) - -// Config holds configuration for HTTP proxy settings. See -// FromEnvironment for details. -type Config struct { - // HTTPProxy represents the value of the HTTP_PROXY or - // http_proxy environment variable. It will be used as the proxy - // URL for HTTP requests and HTTPS requests unless overridden by - // HTTPSProxy or NoProxy. - HTTPProxy string - - // HTTPSProxy represents the HTTPS_PROXY or https_proxy - // environment variable. It will be used as the proxy URL for - // HTTPS requests unless overridden by NoProxy. - HTTPSProxy string - - // NoProxy represents the NO_PROXY or no_proxy environment - // variable. It specifies URLs that should be excluded from - // proxying as a comma-separated list of domain names or a - // single asterisk (*) to indicate that no proxying should be - // done. A domain name matches that name and all subdomains. A - // domain name with a leading "." matches subdomains only. For - // example "foo.com" matches "foo.com" and "bar.foo.com"; - // ".y.com" matches "x.y.com" but not "y.com". - NoProxy string - - // CGI holds whether the current process is running - // as a CGI handler (FromEnvironment infers this from the - // presence of a REQUEST_METHOD environment variable). - // When this is set, ProxyForURL will return an error - // when HTTPProxy applies, because a client could be - // setting HTTP_PROXY maliciously. See https://golang.org/s/cgihttpproxy. - CGI bool -} - -// FromEnvironment returns a Config instance populated from the -// environment variables HTTP_PROXY, HTTPS_PROXY and NO_PROXY (or the -// lowercase versions thereof). HTTPS_PROXY takes precedence over -// HTTP_PROXY for https requests. -// -// The environment values may be either a complete URL or a -// "host[:port]", in which case the "http" scheme is assumed. An error -// is returned if the value is a different form. -func FromEnvironment() *Config { - return &Config{ - HTTPProxy: getEnvAny("HTTP_PROXY", "http_proxy"), - HTTPSProxy: getEnvAny("HTTPS_PROXY", "https_proxy"), - NoProxy: getEnvAny("NO_PROXY", "no_proxy"), - CGI: os.Getenv("REQUEST_METHOD") != "", - } -} - -func getEnvAny(names ...string) string { - for _, n := range names { - if val := os.Getenv(n); val != "" { - return val - } - } - return "" -} - -// ProxyFunc returns a function that determines the proxy URL to use for -// a given request URL. Changing the contents of cfg will not affect -// proxy functions created earlier. -// -// A nil URL and nil error are returned if no proxy is defined in the -// environment, or a proxy should not be used for the given request, as -// defined by NO_PROXY. -// -// As a special case, if req.URL.Host is "localhost" (with or without a -// port number), then a nil URL and nil error will be returned. -func (cfg *Config) ProxyFunc() func(reqURL *url.URL) (*url.URL, error) { - // Prevent Config changes from affecting the function calculation. - // TODO Preprocess proxy settings for more efficient evaluation. - cfg1 := *cfg - return cfg1.proxyForURL -} - -func (cfg *Config) proxyForURL(reqURL *url.URL) (*url.URL, error) { - var proxy string - if reqURL.Scheme == "https" { - proxy = cfg.HTTPSProxy - } - if proxy == "" { - proxy = cfg.HTTPProxy - if proxy != "" && cfg.CGI { - return nil, errors.New("refusing to use HTTP_PROXY value in CGI environment; see golang.org/s/cgihttpproxy") - } - } - if proxy == "" { - return nil, nil - } - if !cfg.useProxy(canonicalAddr(reqURL)) { - return nil, nil - } - proxyURL, err := url.Parse(proxy) - if err != nil || - (proxyURL.Scheme != "http" && - proxyURL.Scheme != "https" && - proxyURL.Scheme != "socks5") { - // proxy was bogus. Try prepending "http://" to it and - // see if that parses correctly. If not, we fall - // through and complain about the original one. - if proxyURL, err := url.Parse("http://" + proxy); err == nil { - return proxyURL, nil - } - } - if err != nil { - return nil, fmt.Errorf("invalid proxy address %q: %v", proxy, err) - } - return proxyURL, nil -} - -// useProxy reports whether requests to addr should use a proxy, -// according to the NO_PROXY or no_proxy environment variable. -// addr is always a canonicalAddr with a host and port. -func (cfg *Config) useProxy(addr string) bool { - if len(addr) == 0 { - return true - } - host, _, err := net.SplitHostPort(addr) - if err != nil { - return false - } - if host == "localhost" { - return false - } - if ip := net.ParseIP(host); ip != nil { - if ip.IsLoopback() { - return false - } - } - - noProxy := cfg.NoProxy - if noProxy == "*" { - return false - } - - addr = strings.ToLower(strings.TrimSpace(addr)) - if hasPort(addr) { - addr = addr[:strings.LastIndex(addr, ":")] - } - - for _, p := range strings.Split(noProxy, ",") { - p = strings.ToLower(strings.TrimSpace(p)) - if len(p) == 0 { - continue - } - if hasPort(p) { - p = p[:strings.LastIndex(p, ":")] - } - if addr == p { - return false - } - if len(p) == 0 { - // There is no host part, likely the entry is malformed; ignore. - continue - } - if p[0] == '.' && (strings.HasSuffix(addr, p) || addr == p[1:]) { - // no_proxy ".foo.com" matches "bar.foo.com" or "foo.com" - return false - } - if p[0] != '.' && strings.HasSuffix(addr, p) && addr[len(addr)-len(p)-1] == '.' { - // no_proxy "foo.com" matches "bar.foo.com" - return false - } - } - return true -} - -var portMap = map[string]string{ - "http": "80", - "https": "443", - "socks5": "1080", -} - -// canonicalAddr returns url.Host but always with a ":port" suffix -func canonicalAddr(url *url.URL) string { - addr := url.Hostname() - if v, err := idnaASCII(addr); err == nil { - addr = v - } - port := url.Port() - if port == "" { - port = portMap[url.Scheme] - } - return net.JoinHostPort(addr, port) -} - -// Given a string of the form "host", "host:port", or "[ipv6::address]:port", -// return true if the string includes a port. -func hasPort(s string) bool { return strings.LastIndex(s, ":") > strings.LastIndex(s, "]") } - -func idnaASCII(v string) (string, error) { - // TODO: Consider removing this check after verifying performance is okay. - // Right now punycode verification, length checks, context checks, and the - // permissible character tests are all omitted. It also prevents the ToASCII - // call from salvaging an invalid IDN, when possible. As a result it may be - // possible to have two IDNs that appear identical to the user where the - // ASCII-only version causes an error downstream whereas the non-ASCII - // version does not. - // Note that for correct ASCII IDNs ToASCII will only do considerably more - // work, but it will not cause an allocation. - if isASCII(v) { - return v, nil - } - return idna.Lookup.ToASCII(v) -} - -func isASCII(s string) bool { - for i := 0; i < len(s); i++ { - if s[i] >= utf8.RuneSelf { - return false - } - } - return true -} |