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package finger
import (
"bytes"
"context"
"errors"
"os/exec"
"tildegit.org/tjp/sliderule/internal/types"
)
// ListingDenied is returned to reject online user listing requests.
var ListingDenied = errors.New("Finger online user list denied.")
// SystemFinger handles finger requests by invoking the finger(1) command-line utility.
func SystemFinger(allowListings bool) types.Handler {
return types.HandlerFunc(func(ctx context.Context, request *types.Request) *types.Response {
fingerPath, err := exec.LookPath("finger")
if err != nil {
_ = request.Server.LogError(
"msg", "handler failure",
"ctx", "exec.LookPath(\"finger\")",
"err", err,
)
return Error("Could not resolve request.")
}
path := request.Path[1:]
if len(path) == 0 && !allowListings {
return Error(ListingDenied.Error())
}
args := make([]string, 0, 1)
if len(path) > 0 {
args = append(args, path)
}
cmd := exec.CommandContext(ctx, fingerPath, args...)
outbuf := &bytes.Buffer{}
cmd.Stdout = outbuf
if err := cmd.Run(); err != nil {
return Error(err.Error())
}
return Success(outbuf)
})
}
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