114 lines
3.7 KiB
Go
114 lines
3.7 KiB
Go
package server
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import (
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"github.com/OrlovEvgeny/go-mcache"
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"github.com/valyala/fasthttp"
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"net"
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"strings"
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"time"
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)
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// DnsLookupCacheTimeout specifies the timeout for the DNS lookup cache.
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var DnsLookupCacheTimeout = 15 * time.Minute
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// dnsLookupCache stores DNS lookups for custom domains
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var dnsLookupCache = mcache.New()
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// getTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix.
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// If everything is fine, it returns the target data.
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func getTargetFromDNS(domain, mainDomainSuffix string) (targetOwner, targetRepo, targetBranch string) {
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// Get CNAME or TXT
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var cname string
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var err error
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if cachedName, ok := dnsLookupCache.Get(domain); ok {
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cname = cachedName.(string)
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} else {
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cname, err = net.LookupCNAME(domain)
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cname = strings.TrimSuffix(cname, ".")
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if err != nil || !strings.HasSuffix(cname, mainDomainSuffix) {
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cname = ""
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// TODO: check if the A record matches!
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names, err := net.LookupTXT(domain)
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if err == nil {
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for _, name := range names {
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name = strings.TrimSuffix(name, ".")
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if strings.HasSuffix(name, mainDomainSuffix) {
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cname = name
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break
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}
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}
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}
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}
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_ = dnsLookupCache.Set(domain, cname, DnsLookupCacheTimeout)
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}
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if cname == "" {
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return
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}
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cnameParts := strings.Split(strings.TrimSuffix(cname, mainDomainSuffix), ".")
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targetOwner = cnameParts[len(cnameParts)-1]
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if len(cnameParts) > 1 {
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targetRepo = cnameParts[len(cnameParts)-2]
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}
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if len(cnameParts) > 2 {
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targetBranch = cnameParts[len(cnameParts)-3]
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}
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if targetRepo == "" {
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targetRepo = "pages"
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}
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if targetBranch == "" && targetRepo != "pages" {
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targetBranch = "pages"
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}
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// if targetBranch is still empty, the caller must find the default branch
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return
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}
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// CanonicalDomainCacheTimeout specifies the timeout for the canonical domain cache.
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var CanonicalDomainCacheTimeout = 15 * time.Minute
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// canonicalDomainCache stores canonical domains
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var canonicalDomainCache = mcache.New()
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// checkCanonicalDomain returns the canonical domain specified in the repo (using the file `.canonical-domain`).
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func checkCanonicalDomain(targetOwner, targetRepo, targetBranch, actualDomain, mainDomainSuffix, giteaRoot, giteaApiToken string) (canonicalDomain string, valid bool) {
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domains := []string{}
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if cachedValue, ok := canonicalDomainCache.Get(targetOwner + "/" + targetRepo + "/" + targetBranch); ok {
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domains = cachedValue.([]string)
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for _, domain := range domains {
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if domain == actualDomain {
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valid = true
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break
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}
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}
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} else {
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req := fasthttp.AcquireRequest()
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req.SetRequestURI(giteaRoot + "/api/v1/repos/" + targetOwner + "/" + targetRepo + "/raw/" + targetBranch + "/.domains" + "?access_token=" + giteaApiToken)
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res := fasthttp.AcquireResponse()
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err := upstreamClient.Do(req, res)
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if err == nil && res.StatusCode() == fasthttp.StatusOK {
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for _, domain := range strings.Split(string(res.Body()), "\n") {
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domain = strings.ToLower(domain)
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domain = strings.TrimSpace(domain)
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domain = strings.TrimPrefix(domain, "http://")
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domain = strings.TrimPrefix(domain, "https://")
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if len(domain) > 0 && !strings.HasPrefix(domain, "#") && !strings.ContainsAny(domain, "\t /") && strings.ContainsRune(domain, '.') {
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domains = append(domains, domain)
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}
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if domain == actualDomain {
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valid = true
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}
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}
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}
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domains = append(domains, targetOwner+mainDomainSuffix)
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if domains[len(domains)-1] == actualDomain {
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valid = true
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}
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if targetRepo != "" && targetRepo != "pages" {
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domains[len(domains)-1] += "/" + targetRepo
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}
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_ = canonicalDomainCache.Set(targetOwner+"/"+targetRepo+"/"+targetBranch, domains, CanonicalDomainCacheTimeout)
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}
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canonicalDomain = domains[0]
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return
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}
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