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package gopher
import (
"bytes"
"errors"
"io"
"net"
neturl "net/url"
"tildegit.org/tjp/sliderule/internal/types"
)
// Client is used for sending gopher requests and producing the responses.
//
// It carries no state and is reusable simultaneously by multiple goroutines.
//
// The zero value is immediately usable.
type Client struct{}
// RoundTrip sends a single gopher request and returns its response.
func (c Client) RoundTrip(request *types.Request) (*types.Response, error) {
if request.Scheme != "gopher" && request.Scheme != "" {
return nil, errors.New("non-gopher protocols not supported")
}
host := request.Host
if _, port, _ := net.SplitHostPort(host); port == "" {
host = net.JoinHostPort(host, "70")
}
conn, err := net.Dial("tcp", host)
if err != nil {
return nil, err
}
defer conn.Close()
request.RemoteAddr = conn.RemoteAddr()
request.TLSState = nil
requestBody := request.Path
if request.RawQuery != "" {
requestBody += "\t" + request.UnescapedQuery()
}
requestBody += "\r\n"
if _, err := conn.Write([]byte(requestBody)); err != nil {
return nil, err
}
response, err := io.ReadAll(conn)
if err != nil {
return nil, err
}
return &types.Response{Body: bytes.NewBuffer(response)}, nil
}
// Fetch parses a URL string and fetches the gopher resource.
func (c Client) Fetch(url string) (*types.Response, error) {
u, err := neturl.Parse(url)
if err != nil {
return nil, err
}
return c.RoundTrip(&types.Request{URL: u})
}
func (c Client) IsRedirect(_ *types.Response) bool { return false }
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