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package finger
import (
"bytes"
"context"
"errors"
"io"
"net"
"strings"
"tildegit.org/tjp/sliderule/internal/types"
)
// Client is used for sending finger requests and reading 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 finger request and returns its response.
func (c Client) RoundTrip(ctx context.Context, request *types.Request) (*types.Response, error) {
if request.Scheme != "finger" && request.Scheme != "" {
return nil, errors.New("non-finger protocols not supported")
}
host := request.Host
if _, port, _ := net.SplitHostPort(host); port == "" {
host = net.JoinHostPort(host, "79")
}
conn, err := (&net.Dialer{}).DialContext(ctx, "tcp", host)
if err != nil {
return nil, err
}
defer conn.Close()
request.RemoteAddr = conn.RemoteAddr()
request.TLSState = nil
username := request.User.String()
if username == "" {
username = strings.TrimPrefix(request.Path, "/")
}
if _, err := conn.Write([]byte(username + "\r\n")); err != nil {
return nil, err
}
response, err := io.ReadAll(conn)
if err != nil {
return nil, err
}
return &types.Response{Body: bytes.NewBuffer(response), Request: request}, nil
}
// Fetch resolves a finger query.
func (c Client) Fetch(ctx context.Context, query string) (*types.Response, error) {
req, err := ParseRequest(bytes.NewBufferString(query + "\r\n"))
if err != nil {
return nil, err
}
return c.RoundTrip(ctx, req)
}
func (c Client) IsRedirect(_ *types.Response) bool { return false }
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