mirror of
https://github.com/go-gitea/gitea.git
synced 2026-09-11 01:41:46 +02:00
silverwind
052bc4b496
Restore the toolchain pin renovate dropped. The go directive has to lose its patch version for that: go removes a toolchain equal to it, and every go command then refuses to run until go.mod is tidied. Go 1.27 changes the flate encoder, so the sizes and checksums pinned by package tests move with the compressed output. Hash the avatar test input directly instead of a png, which has no bearing on what it asserts. encoding/json v2 is no longer an experiment, so drop the v1 implementation and GOEXPERIMENT=jsonv2 with it. Assisted-by: Claude Code:Opus 5
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
// Copyright 2026 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package avatar
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import (
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"context"
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"errors"
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"net"
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"strconv"
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"strings"
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"time"
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"gitea.dev/modules/cache"
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)
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// LookupFederatedHost returns the avatar host from the email domain's SRV record. https://wiki.libravatar.org/api/
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func LookupFederatedHost(ctx context.Context, email string, secure bool) string {
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_, domain, found := strings.CutLast(email, "@")
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if !found {
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return ""
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}
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domain = strings.ToLower(domain)
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service, defaultPort := "avatars", uint16(80)
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if secure {
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service, defaultPort = "avatars-sec", 443
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}
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host, _ := cache.GetString(cache.SafeCacheKey("Avatar:SRV:"+service, domain), func() (string, error) {
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lookupCtx, cancel := context.WithTimeout(ctx, 3*time.Second) // a slow resolver must not stall the request
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defer cancel()
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// LookupSRV already sorts by priority and randomizes by weight (RFC 2782)
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_, records, err := net.DefaultResolver.LookupSRV(lookupCtx, service, "tcp", domain)
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var dnsErr *net.DNSError
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if err != nil && !(errors.As(err, &dnsErr) && dnsErr.IsNotFound) {
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return "", err // a timeout or a cancelled request must not cache as "no record"
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}
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if err != nil || len(records) == 0 {
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return "", nil
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}
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return srvHost(records[0], defaultPort), nil
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})
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return host
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}
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// a target of "." means the service is unavailable (RFC 2782)
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func srvHost(record *net.SRV, defaultPort uint16) string {
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target := strings.TrimSuffix(record.Target, ".")
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if target == "" || record.Port == defaultPort {
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return target
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}
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return net.JoinHostPort(target, strconv.Itoa(int(record.Port)))
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}
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