Update to version 8.5.5 | Read HISTORY.md

Former-commit-id: dced7d472edabbab4f80c76051f13261928a8dea

core/maintenance/authenticate.go

@@ -0,0 +1,93 @@
+package maintenance
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/url"
+
+	"github.com/kataras/iris/core/maintenance/client"
+	"github.com/kataras/iris/core/maintenance/encoding"
+
+	"github.com/kataras/survey"
+)
+
+// question describes the question which will be used
+// for the survey in order to authenticate the local iris.
+type question struct {
+	Message string `json:"message"`
+}
+
+func hasInternetConnection() (bool, bool) {
+	r, err := client.PostForm("", nil)
+	if err != nil {
+		// no internet connection
+		return false, false
+	}
+	defer r.Body.Close()
+	return true, r.StatusCode == 204
+}
+
+func ask() bool {
+	qs := fetchQuestions()
+	var lastResponseUnsed string
+	for _, q := range qs {
+		survey.AskOne(&survey.Input{Message: q.Message}, &lastResponseUnsed, validate(q))
+	}
+
+	return lastResponseUnsed != ""
+}
+
+// fetchQuestions returns a list of questions
+// fetched by the authority server.
+func fetchQuestions() (qs []question) {
+	r, err := client.PostForm("/survey/ask", nil)
+	if err != nil {
+		return
+	}
+	defer r.Body.Close()
+	if err := encoding.UnmarshalBody(r.Body, &qs, json.Unmarshal); err != nil {
+		return
+	}
+
+	return
+}
+
+func validate(q question) survey.Validator {
+	return func(answer interface{}) error {
+		if err := survey.Required(answer); err != nil {
+			return err
+		}
+
+		ans, ok := answer.(string)
+		if !ok {
+			return fmt.Errorf("bug: expected string but got %v", answer)
+		}
+		data := url.Values{
+			"q":               []string{q.Message},
+			"ans":             []string{ans},
+			"current_version": []string{Version},
+		}
+
+		r, err := client.PostForm("/survey/submit", data)
+		if err != nil {
+			// error from server-side, allow.
+			return nil
+		}
+		defer r.Body.Close()
+
+		if r.StatusCode == 200 {
+			// read the whole thing, it has nothing.
+			io.Copy(ioutil.Discard, r.Body)
+			return nil // pass, no any errors.
+		}
+		// now, if invalid;
+		got, err := ioutil.ReadAll(r.Body)
+		if err != nil {
+			return nil
+		}
+		errMsg := string(got)
+		return fmt.Errorf(errMsg)
+	}
+}