pages-server/domains.go

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package main
import (
"github.com/OrlovEvgeny/go-mcache"
"github.com/valyala/fasthttp"
"net"
"strings"
"time"
)
// DnsLookupCacheTimeout specifies the timeout for the DNS lookup cache.
var DnsLookupCacheTimeout = 15*time.Minute
// dnsLookupCache stores DNS lookups for custom domains
var dnsLookupCache = mcache.New()
// getTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix, and checks if
// the domain equals the repository's ".canonical-domain" file. If everything is fine, it returns the target data.
func getTargetFromDNS(domain string) (targetOwner, targetRepo, targetBranch string) {
// Get CNAME or TXT
var cname string
var err error
if cachedName, ok := dnsLookupCache.Get(domain); ok {
cname = cachedName.(string)
} else {
cname, err = net.LookupCNAME(domain)
cname = strings.TrimSuffix(cname, ".")
if err != nil || !strings.HasSuffix(cname, string(MainDomainSuffix)) {
cname = ""
names, err := net.LookupTXT(domain)
if err == nil {
for _, name := range names {
name = strings.TrimSuffix(name, ".")
if strings.HasSuffix(name, string(MainDomainSuffix)) {
cname = name
break
}
}
}
}
_ = dnsLookupCache.Set(domain, cname, DnsLookupCacheTimeout)
}
if cname == "" {
return
}
cnameParts := strings.Split(strings.TrimSuffix(cname, string(MainDomainSuffix)), ".")
targetOwner = cnameParts[len(cnameParts)-1]
if len(cnameParts) > 1 {
targetRepo = cnameParts[len(cnameParts)-1]
}
if len(cnameParts) > 2 {
targetBranch = cnameParts[len(cnameParts)-2]
}
if targetRepo == "" {
targetRepo = "pages"
}
if targetBranch == "" && targetRepo != "pages" {
targetBranch = "pages"
}
// if targetBranch is still empty, the caller must find the default branch
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return
}
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// CanonicalDomainCacheTimeout specifies the timeout for the canonical domain cache.
var CanonicalDomainCacheTimeout = 15*time.Minute
// canonicalDomainCache stores canonical domains
var canonicalDomainCache = mcache.New()
// checkCanonicalDomain returns the canonical domain specified in the repo (using the file `.canonical-domain`).
func checkCanonicalDomain(targetOwner, targetRepo, targetBranch string) (canonicalDomain string) {
// Check if the canonical domain matches
req := fasthttp.AcquireRequest()
req.SetRequestURI(string(GiteaRoot) + "/api/v1/repos/" + targetOwner + "/" + targetRepo + "/raw/" + targetBranch + "/.canonical-domain")
res := fasthttp.AcquireResponse()
if cachedValue, ok := canonicalDomainCache.Get(string(req.RequestURI())); ok {
canonicalDomain = cachedValue.(string)
} else {
err := upstreamClient.Do(req, res)
if err == nil && res.StatusCode() == fasthttp.StatusOK {
canonicalDomain = strings.TrimSpace(string(res.Body()))
if strings.Contains(canonicalDomain, "/") {
canonicalDomain = ""
}
}
if canonicalDomain == "" {
canonicalDomain = targetOwner + string(MainDomainSuffix)
if targetRepo != "" && targetRepo != "pages" {
canonicalDomain += "/" + targetRepo
}
}
_ = canonicalDomainCache.Set(string(req.RequestURI()), canonicalDomain, CanonicalDomainCacheTimeout)
}
return
}