mirror of
https://github.com/caddyserver/caddy.git
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113 lines
3.9 KiB
Go
113 lines
3.9 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package reverseproxy
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import (
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"fmt"
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"net"
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"net/url"
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"strings"
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"github.com/caddyserver/caddy/v2"
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)
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// parseUpstreamDialAddress parses configuration inputs for
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// the dial address, including support for a scheme in front
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// as a shortcut for the port number, and a network type,
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// for example 'unix' to dial a unix socket.
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//
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// TODO: the logic in this function is kind of sensitive, we
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// need to write tests before making any more changes to it
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func parseUpstreamDialAddress(upstreamAddr string) (string, string, error) {
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var network, scheme, host, port string
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if strings.Contains(upstreamAddr, "://") {
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// we get a parsing error if a placeholder is specified
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// so we return a more user-friendly error message instead
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// to explain what to do instead
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if strings.Contains(upstreamAddr, "{") {
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return "", "", fmt.Errorf("due to parsing difficulties, placeholders are not allowed when an upstream address contains a scheme")
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}
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toURL, err := url.Parse(upstreamAddr)
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if err != nil {
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return "", "", fmt.Errorf("parsing upstream URL: %v", err)
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}
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// there is currently no way to perform a URL rewrite between choosing
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// a backend and proxying to it, so we cannot allow extra components
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// in backend URLs
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if toURL.Path != "" || toURL.RawQuery != "" || toURL.Fragment != "" {
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return "", "", fmt.Errorf("for now, URLs for proxy upstreams only support scheme, host, and port components")
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}
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// ensure the port and scheme aren't in conflict
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urlPort := toURL.Port()
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if toURL.Scheme == "http" && urlPort == "443" {
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return "", "", fmt.Errorf("upstream address has conflicting scheme (http://) and port (:443, the HTTPS port)")
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}
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if toURL.Scheme == "https" && urlPort == "80" {
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return "", "", fmt.Errorf("upstream address has conflicting scheme (https://) and port (:80, the HTTP port)")
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}
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if toURL.Scheme == "h2c" && urlPort == "443" {
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return "", "", fmt.Errorf("upstream address has conflicting scheme (h2c://) and port (:443, the HTTPS port)")
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}
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// if port is missing, attempt to infer from scheme
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if toURL.Port() == "" {
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var toPort string
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switch toURL.Scheme {
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case "", "http", "h2c":
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toPort = "80"
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case "https":
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toPort = "443"
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}
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toURL.Host = net.JoinHostPort(toURL.Hostname(), toPort)
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}
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scheme, host, port = toURL.Scheme, toURL.Hostname(), toURL.Port()
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} else {
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// extract network manually, since caddy.ParseNetworkAddress() will always add one
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if idx := strings.Index(upstreamAddr, "/"); idx >= 0 {
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network = strings.ToLower(strings.TrimSpace(upstreamAddr[:idx]))
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upstreamAddr = upstreamAddr[idx+1:]
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}
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var err error
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host, port, err = net.SplitHostPort(upstreamAddr)
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if err != nil {
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host = upstreamAddr
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}
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// we can assume a port if only a hostname is specified, but use of a
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// placeholder without a port likely means a port will be filled in
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if port == "" && !strings.Contains(host, "{") {
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port = "80"
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}
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}
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// for simplest possible config, we only need to include
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// the network portion if the user specified one
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if network != "" {
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return caddy.JoinNetworkAddress(network, host, port), scheme, nil
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}
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// if the host is a placeholder, then we don't want to join with an empty port,
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// because that would just append an extra ':' at the end of the address.
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if port == "" && strings.Contains(host, "{") {
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return host, scheme, nil
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}
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return net.JoinHostPort(host, port), scheme, nil
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}
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