github.com/kaydxh/golang@v0.0.131/go/net/http/http_host_context.go (about)

     1  /*
     2   *Copyright (c) 2023, kaydxh
     3   *
     4   *Permission is hereby granted, free of charge, to any person obtaining a copy
     5   *of this software and associated documentation files (the "Software"), to deal
     6   *in the Software without restriction, including without limitation the rights
     7   *to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   *copies of the Software, and to permit persons to whom the Software is
     9   *furnished to do so, subject to the following conditions:
    10   *
    11   *The above copyright notice and this permission notice shall be included in all
    12   *copies or substantial portions of the Software.
    13   *
    14   *THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   *IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   *FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   *AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   *LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   *OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   *SOFTWARE.
    21   */
    22  package http
    23  
    24  import (
    25  	"context"
    26  	"fmt"
    27  	"net/url"
    28  
    29  	"github.com/kaydxh/golang/go/net/resolver"
    30  )
    31  
    32  type hostContextKey struct{}
    33  
    34  type Host struct {
    35  	HostTarget           string
    36  	ReplaceHostInRequest bool
    37  
    38  	HostTargetAddrResolved resolver.Address
    39  }
    40  
    41  func FromContextHost(ctx context.Context) *Host {
    42  	host, _ := ctx.Value(hostContextKey{}).(*Host)
    43  	return host
    44  }
    45  
    46  func WithContextHost(ctx context.Context, host *Host) context.Context {
    47  	if host == nil {
    48  		panic("nil host")
    49  	}
    50  	return context.WithValue(ctx, hostContextKey{}, host)
    51  }
    52  
    53  func ParseTargetUrl(host string) (*url.URL, error) {
    54  	if host == "" {
    55  		return nil, nil
    56  	}
    57  
    58  	hostURL, err := url.Parse(host)
    59  	if err != nil {
    60  		return nil, fmt.Errorf("invalid host address %q: %v", host, err)
    61  	}
    62  	return hostURL, nil
    63  }