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gitea/vendor/github.com/mholt/acmez/solver.go

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// Copyright 2020 Matthew Holt
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package acmez
import (
"context"
"github.com/mholt/acmez/acme"
)
// Solver is a type that can solve ACME challenges. All
// implementations MUST honor context cancellation.
type Solver interface {
// Present is called just before a challenge is initiated.
// The implementation MUST prepare anything that is necessary
// for completing the challenge; for example, provisioning
// an HTTP resource, TLS certificate, or a DNS record.
//
// It MUST return quickly. If presenting the challenge token
// will take time, then the implementation MUST do the
// minimum amount of work required in this method, and
// SHOULD additionally implement the Waiter interface.
// For example, a DNS challenge solver might make a quick
// HTTP request to a provider's API to create a new DNS
// record, but it might be several minutes or hours before
// the DNS record propagates. The API request should be
// done in Present(), and waiting for propagation should
// be done in Wait().
Present(context.Context, acme.Challenge) error
// CleanUp is called after a challenge is finished, whether
// successful or not. It MUST free/remove any resources it
// allocated/created during Present. It SHOULD NOT require
// that Present ran successfully. It MUST return quickly.
CleanUp(context.Context, acme.Challenge) error
}
// Waiter is an optional interface for Solvers to implement. Its
// primary purpose is to help ensure the challenge can be solved
// before the server gives up trying to verify the challenge.
//
// If implemented, it will be called after Present() but just
// before the challenge is initiated with the server. It blocks
// until the challenge is ready to be solved. (For example,
// waiting on a DNS record to propagate.) This allows challenges
// to succeed that would normally fail because they take too long
// to set up (i.e. the ACME server would give up polling DNS or
// the client would timeout its polling). By separating Present()
// from Wait(), it allows the slow part of all solvers to begin
// up front, rather than waiting on each solver one at a time.
//
// It MUST NOT do anything exclusive of Present() that is required
// for the challenge to succeed. In other words, if Present() is
// called but Wait() is not, then the challenge should still be able
// to succeed assuming infinite time.
//
// Implementations MUST honor context cancellation.
type Waiter interface {
Wait(context.Context, acme.Challenge) error
}