micro/api/server/acme/certmagic/certmagic.go

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// Package certmagic is the ACME provider from github.com/caddyserver/certmagic
package certmagic
import (
"crypto/tls"
"math/rand"
"net"
"time"
"github.com/caddyserver/certmagic"
"github.com/unistack-org/micro/v3/api/server/acme"
"github.com/unistack-org/micro/v3/logger"
)
type certmagicProvider struct {
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opts acme.Options
}
// TODO: set self-contained options
func (c *certmagicProvider) setup() {
certmagic.DefaultACME.CA = c.opts.CA
if c.opts.ChallengeProvider != nil {
// Enabling DNS Challenge disables the other challenges
certmagic.DefaultACME.DNSProvider = c.opts.ChallengeProvider
}
if c.opts.OnDemand {
certmagic.Default.OnDemand = new(certmagic.OnDemandConfig)
}
if c.opts.Cache != nil {
// already validated by new()
certmagic.Default.Storage = c.opts.Cache.(certmagic.Storage)
}
// If multiple instances of the provider are running, inject some
// randomness so they don't collide
// RenewalWindowRatio [0.33 - 0.50)
rand.Seed(time.Now().UnixNano())
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randomRatio := float64(rand.Intn(17)+33) * 0.01
certmagic.Default.RenewalWindowRatio = randomRatio
}
func (c *certmagicProvider) Listen(hosts ...string) (net.Listener, error) {
c.setup()
return certmagic.Listen(hosts)
}
func (c *certmagicProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
c.setup()
return certmagic.TLS(hosts)
}
// NewProvider returns a certmagic provider
func NewProvider(options ...acme.Option) acme.Provider {
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opts := acme.DefaultOptions()
for _, o := range options {
o(&opts)
}
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if opts.Cache != nil {
if _, ok := opts.Cache.(certmagic.Storage); !ok {
logger.Fatal("ACME: cache provided doesn't implement certmagic's Storage interface")
}
}
return &certmagicProvider{
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opts: opts,
}
}