70 lines
2 KiB
Go
70 lines
2 KiB
Go
// Package websteps implements the websteps test helper.
|
|
//
|
|
// See the https://github.com/ooni/spec/blob/master/backends/th-007-websteps.md
|
|
// related specification document.
|
|
//
|
|
// This implementation uses version 202108.17.1114 of the spec.
|
|
package websteps
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
|
|
"github.com/ooni/probe-cli/v3/internal/engine/netx/archival"
|
|
"github.com/ooni/probe-cli/v3/internal/netxlite/iox"
|
|
"github.com/ooni/probe-cli/v3/internal/runtimex"
|
|
"github.com/ooni/probe-cli/v3/internal/version"
|
|
)
|
|
|
|
// newfailure is a convenience shortcut to save typing
|
|
var newfailure = archival.NewFailure
|
|
|
|
// maxAcceptableBody is _at the same time_ the maximum acceptable body for incoming
|
|
// API requests and the maximum acceptable body when fetching arbitrary URLs. See
|
|
// https://github.com/ooni/probe/issues/1727 for statistics regarding the test lists
|
|
// including the empirical CDF of the body size for test lists URLs.
|
|
const maxAcceptableBody = 1 << 24
|
|
|
|
// Handler implements the websteps test helper HTTP API.
|
|
type Handler struct {
|
|
Config *Config
|
|
}
|
|
|
|
// ServeHTTP implements http.Handler.ServeHTTP.
|
|
func (h *Handler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
|
|
w.Header().Add("Server", fmt.Sprintf(
|
|
"oohelperd/%s ooniprobe-engine/%s", version.Version, version.Version,
|
|
))
|
|
if req.Method != "POST" {
|
|
w.WriteHeader(400)
|
|
return
|
|
}
|
|
reader := &io.LimitedReader{R: req.Body, N: maxAcceptableBody}
|
|
data, err := iox.ReadAllContext(req.Context(), reader)
|
|
if err != nil {
|
|
w.WriteHeader(400)
|
|
return
|
|
}
|
|
var creq CtrlRequest
|
|
if err := json.Unmarshal(data, &creq); err != nil {
|
|
w.WriteHeader(400)
|
|
return
|
|
}
|
|
cresp, err := Measure(req.Context(), &creq, h.Config)
|
|
if err != nil {
|
|
if err == ErrInternalServer {
|
|
w.WriteHeader(500)
|
|
return
|
|
}
|
|
w.WriteHeader(400)
|
|
return
|
|
}
|
|
// We assume that the following call cannot fail because it's a
|
|
// clearly serializable data structure.
|
|
data, err = json.Marshal(cresp)
|
|
runtimex.PanicOnError(err, "json.Marshal failed")
|
|
w.Header().Add("Content-Type", "application/json")
|
|
w.Write(data)
|
|
}
|