04e2d74406
This commit adds a new DNS provider for [acme-dns](https://github.com/joohoi/acme-dns) to allow Lego to set DNS-01 challenge response TXT with an ACME-DNS server automatically. ACME-DNS allows ceding minimal zone editing permissions to the ACME client and can be useful when the primary DNS provider for the zone does not allow scripting/API access but can set a CNAME to an ACME-DNS server. Lower level ACME-DNS API calls & account loading/storing is handled by the `github.com/cpu/goacmedns` library. The provider loads existing ACME-DNS accounts from the specified JSON file on disk. Any accounts the provider registers on behalf of the user will also be saved to this JSON file. When required, the provider handles registering accounts with the ACME-DNS server domains that do not already have an ACME-DNS account. This will halt issuance with an error prompting the user to set the one-time manual CNAME required to delegate the DNS-01 challenge record to the ACME-DNS server. Subsequent runs will use the account from disk and assume the CNAME is in-place.
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MIT License
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Copyright (c) 2018 Daniel McCarney
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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