forked from toolshed/abra
decentral1se
1723025fbf
We were running behind and there were quite some deprecations to update. This was mostly in the upstream copy/pasta package but seems quite minimal.
117 lines
3.5 KiB
Go
117 lines
3.5 KiB
Go
/*
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*
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* Copyright 2017 gRPC 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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*
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*/
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package transport
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import (
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"bufio"
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"context"
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"encoding/base64"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"google.golang.org/grpc/internal"
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"google.golang.org/grpc/internal/proxyattributes"
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"google.golang.org/grpc/resolver"
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)
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const proxyAuthHeaderKey = "Proxy-Authorization"
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// To read a response from a net.Conn, http.ReadResponse() takes a bufio.Reader.
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// It's possible that this reader reads more than what's need for the response
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// and stores those bytes in the buffer. bufConn wraps the original net.Conn
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// and the bufio.Reader to make sure we don't lose the bytes in the buffer.
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type bufConn struct {
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net.Conn
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r io.Reader
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}
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func (c *bufConn) Read(b []byte) (int, error) {
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return c.r.Read(b)
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}
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func basicAuth(username, password string) string {
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auth := username + ":" + password
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return base64.StdEncoding.EncodeToString([]byte(auth))
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}
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func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, grpcUA string, opts proxyattributes.Options) (_ net.Conn, err error) {
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defer func() {
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if err != nil {
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conn.Close()
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}
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}()
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req := &http.Request{
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Method: http.MethodConnect,
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URL: &url.URL{Host: opts.ConnectAddr},
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Header: map[string][]string{"User-Agent": {grpcUA}},
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}
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if user := opts.User; user != nil {
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u := user.Username()
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p, _ := user.Password()
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req.Header.Add(proxyAuthHeaderKey, "Basic "+basicAuth(u, p))
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}
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if err := sendHTTPRequest(ctx, req, conn); err != nil {
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return nil, fmt.Errorf("failed to write the HTTP request: %v", err)
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}
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r := bufio.NewReader(conn)
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resp, err := http.ReadResponse(r, req)
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if err != nil {
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return nil, fmt.Errorf("reading server HTTP response: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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dump, err := httputil.DumpResponse(resp, true)
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if err != nil {
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return nil, fmt.Errorf("failed to do connect handshake, status code: %s", resp.Status)
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}
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return nil, fmt.Errorf("failed to do connect handshake, response: %q", dump)
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}
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// The buffer could contain extra bytes from the target server, so we can't
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// discard it. However, in many cases where the server waits for the client
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// to send the first message (e.g. when TLS is being used), the buffer will
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// be empty, so we can avoid the overhead of reading through this buffer.
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if r.Buffered() != 0 {
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return &bufConn{Conn: conn, r: r}, nil
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}
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return conn, nil
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}
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// proxyDial establishes a TCP connection to the specified address and performs an HTTP CONNECT handshake.
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func proxyDial(ctx context.Context, addr resolver.Address, grpcUA string, opts proxyattributes.Options) (net.Conn, error) {
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conn, err := internal.NetDialerWithTCPKeepalive().DialContext(ctx, "tcp", addr.Addr)
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if err != nil {
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return nil, err
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}
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return doHTTPConnectHandshake(ctx, conn, grpcUA, opts)
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}
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func sendHTTPRequest(ctx context.Context, req *http.Request, conn net.Conn) error {
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req = req.WithContext(ctx)
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if err := req.Write(conn); err != nil {
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return fmt.Errorf("failed to write the HTTP request: %v", err)
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}
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return nil
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}
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