dont access global vars inject them

server/domains.go

@@ -0,0 +1,113 @@
+package server
+
+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.
+// If everything is fine, it returns the target data.
+func getTargetFromDNS(domain, mainDomainSuffix 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, mainDomainSuffix) {
+			cname = ""
+			// TODO: check if the A record matches!
+			names, err := net.LookupTXT(domain)
+			if err == nil {
+				for _, name := range names {
+					name = strings.TrimSuffix(name, ".")
+					if strings.HasSuffix(name, mainDomainSuffix) {
+						cname = name
+						break
+					}
+				}
+			}
+		}
+		_ = dnsLookupCache.Set(domain, cname, DnsLookupCacheTimeout)
+	}
+	if cname == "" {
+		return
+	}
+	cnameParts := strings.Split(strings.TrimSuffix(cname, mainDomainSuffix), ".")
+	targetOwner = cnameParts[len(cnameParts)-1]
+	if len(cnameParts) > 1 {
+		targetRepo = cnameParts[len(cnameParts)-2]
+	}
+	if len(cnameParts) > 2 {
+		targetBranch = cnameParts[len(cnameParts)-3]
+	}
+	if targetRepo == "" {
+		targetRepo = "pages"
+	}
+	if targetBranch == "" && targetRepo != "pages" {
+		targetBranch = "pages"
+	}
+	// if targetBranch is still empty, the caller must find the default branch
+	return
+}
+
+// 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, actualDomain, mainDomainSuffix, giteaRoot, giteaApiToken string) (canonicalDomain string, valid bool) {
+	domains := []string{}
+	if cachedValue, ok := canonicalDomainCache.Get(targetOwner + "/" + targetRepo + "/" + targetBranch); ok {
+		domains = cachedValue.([]string)
+		for _, domain := range domains {
+			if domain == actualDomain {
+				valid = true
+				break
+			}
+		}
+	} else {
+		req := fasthttp.AcquireRequest()
+		req.SetRequestURI(giteaRoot + "/api/v1/repos/" + targetOwner + "/" + targetRepo + "/raw/" + targetBranch + "/.domains" + "?access_token=" + giteaApiToken)
+		res := fasthttp.AcquireResponse()
+
+		err := upstreamClient.Do(req, res)
+		if err == nil && res.StatusCode() == fasthttp.StatusOK {
+			for _, domain := range strings.Split(string(res.Body()), "\n") {
+				domain = strings.ToLower(domain)
+				domain = strings.TrimSpace(domain)
+				domain = strings.TrimPrefix(domain, "http://")
+				domain = strings.TrimPrefix(domain, "https://")
+				if len(domain) > 0 && !strings.HasPrefix(domain, "#") && !strings.ContainsAny(domain, "\t /") && strings.ContainsRune(domain, '.') {
+					domains = append(domains, domain)
+				}
+				if domain == actualDomain {
+					valid = true
+				}
+			}
+		}
+		domains = append(domains, targetOwner+mainDomainSuffix)
+		if domains[len(domains)-1] == actualDomain {
+			valid = true
+		}
+		if targetRepo != "" && targetRepo != "pages" {
+			domains[len(domains)-1] += "/" + targetRepo
+		}
+		_ = canonicalDomainCache.Set(targetOwner+"/"+targetRepo+"/"+targetBranch, domains, CanonicalDomainCacheTimeout)
+	}
+	canonicalDomain = domains[0]
+	return
+}