Migrate to go-acme/lego.

vendor/github.com/go-acme/lego/acme/errors.go

@@ -0,0 +1,58 @@
+package acme
+
+import (
+	"fmt"
+)
+
+// Errors types
+const (
+	errNS       = "urn:ietf:params:acme:error:"
+	BadNonceErr = errNS + "badNonce"
+)
+
+// ProblemDetails the problem details object
+// - https://tools.ietf.org/html/rfc7807#section-3.1
+// - https://tools.ietf.org/html/draft-ietf-acme-acme-16#section-7.3.3
+type ProblemDetails struct {
+	Type        string       `json:"type,omitempty"`
+	Detail      string       `json:"detail,omitempty"`
+	HTTPStatus  int          `json:"status,omitempty"`
+	Instance    string       `json:"instance,omitempty"`
+	SubProblems []SubProblem `json:"subproblems,omitempty"`
+
+	// additional values to have a better error message (Not defined by the RFC)
+	Method string `json:"method,omitempty"`
+	URL    string `json:"url,omitempty"`
+}
+
+// SubProblem a "subproblems"
+// - https://tools.ietf.org/html/draft-ietf-acme-acme-16#section-6.7.1
+type SubProblem struct {
+	Type       string     `json:"type,omitempty"`
+	Detail     string     `json:"detail,omitempty"`
+	Identifier Identifier `json:"identifier,omitempty"`
+}
+
+func (p ProblemDetails) Error() string {
+	msg := fmt.Sprintf("acme: error: %d", p.HTTPStatus)
+	if len(p.Method) != 0 || len(p.URL) != 0 {
+		msg += fmt.Sprintf(" :: %s :: %s", p.Method, p.URL)
+	}
+	msg += fmt.Sprintf(" :: %s :: %s", p.Type, p.Detail)
+
+	for _, sub := range p.SubProblems {
+		msg += fmt.Sprintf(", problem: %q :: %s", sub.Type, sub.Detail)
+	}
+
+	if len(p.Instance) == 0 {
+		msg += ", url: " + p.Instance
+	}
+
+	return msg
+}
+
+// NonceError represents the error which is returned
+// if the nonce sent by the client was not accepted by the server.
+type NonceError struct {
+	*ProblemDetails
+}