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