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update go-libipfs and re-use golibipfs default dns resolvers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,88 +1,20 @@ | ||
| package node | ||
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| import ( | ||
| "fmt" | ||
| "math" | ||
| "strings" | ||
| "time" | ||
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| "github.com/ipfs/go-libipfs/gateway" | ||
| config "github.com/ipfs/kubo/config" | ||
| doh "github.com/libp2p/go-doh-resolver" | ||
| madns "github.com/multiformats/go-multiaddr-dns" | ||
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| "github.com/miekg/dns" | ||
| ) | ||
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| var defaultResolvers = map[string]string{ | ||
| "eth.": "https://resolver.cloudflare-eth.com/dns-query", | ||
| "crypto.": "https://resolver.cloudflare-eth.com/dns-query", | ||
| } | ||
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| func newResolver(url string, opts ...doh.Option) (madns.BasicResolver, error) { | ||
| if !strings.HasPrefix(url, "https://") { | ||
| return nil, fmt.Errorf("invalid resolver url: %s", url) | ||
| } | ||
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| return doh.NewResolver(url, opts...) | ||
| } | ||
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| func DNSResolver(cfg *config.Config) (*madns.Resolver, error) { | ||
| var opts []madns.Option | ||
| var err error | ||
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| var dohOpts []doh.Option | ||
| if !cfg.DNS.MaxCacheTTL.IsDefault() { | ||
| dohOpts = append(dohOpts, doh.WithMaxCacheTTL(cfg.DNS.MaxCacheTTL.WithDefault(time.Duration(math.MaxUint32)*time.Second))) | ||
| } | ||
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| domains := make(map[string]struct{}) // to track overridden default resolvers | ||
| rslvrs := make(map[string]madns.BasicResolver) // to reuse resolvers for the same URL | ||
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| for domain, url := range cfg.DNS.Resolvers { | ||
| if domain != "." && !dns.IsFqdn(domain) { | ||
| return nil, fmt.Errorf("invalid domain %s; must be FQDN", domain) | ||
| } | ||
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| domains[domain] = struct{}{} | ||
| if url == "" { | ||
| // allow overriding of implicit defaults with the default resolver | ||
| continue | ||
| } | ||
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| rslv, ok := rslvrs[url] | ||
| if !ok { | ||
| rslv, err = newResolver(url, dohOpts...) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("bad resolver for %s: %w", domain, err) | ||
| } | ||
| rslvrs[url] = rslv | ||
| } | ||
|
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| if domain != "." { | ||
| opts = append(opts, madns.WithDomainResolver(domain, rslv)) | ||
| } else { | ||
| opts = append(opts, madns.WithDefaultResolver(rslv)) | ||
| } | ||
| } | ||
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| // fill in defaults if not overridden by the user | ||
| for domain, url := range defaultResolvers { | ||
| _, ok := domains[domain] | ||
| if ok { | ||
| continue | ||
| } | ||
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| rslv, ok := rslvrs[url] | ||
| if !ok { | ||
| rslv, err = newResolver(url) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("bad resolver for %s: %w", domain, err) | ||
| } | ||
| rslvrs[url] = rslv | ||
| } | ||
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| opts = append(opts, madns.WithDomainResolver(domain, rslv)) | ||
| } | ||
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| return madns.NewResolver(opts...) | ||
| return gateway.NewDNSResolver(cfg.DNS.Resolvers, dohOpts...) | ||
| } |
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