Massive refactoring, struct cleanup, supporting more features

Features:
- Protocol lists (http, https), managed by http responses
- Working TLS Checks
- Root certificate parsing for TLS checks
- Moving configuration into a Config struct, no more direct viper access

armbianmirror_suite_test.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	"testing"

check.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	"crypto/tls"
@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"net/url"
 	"runtime"
+	"strings"
 	"time"
 )
 
@@ -18,8 +19,14 @@ var (
 	ErrCertExpired   = errors.New("certificate is expired")
 )
 
+func (r *Redirector) checkHttp(scheme string) ServerCheck {
+	return func(server *Server, logFields log.Fields) (bool, error) {
+		return r.checkHttpScheme(server, scheme, logFields)
+	}
+}
+
 // checkHttp checks a URL for validity, and checks redirects
-func checkHttp(server *Server, logFields log.Fields) (bool, error) {
+func (r *Redirector) checkHttpScheme(server *Server, scheme string, logFields log.Fields) (bool, error) {
 	u := &url.URL{
 		Scheme: "http",
 		Host:   server.Host,
@@ -48,13 +55,20 @@ func checkHttp(server *Server, logFields log.Fields) (bool, error) {
 
 			logFields["url"] = location
 
-			// Check that we don't redirect to https from a http url
+			switch u.Scheme {
-			if u.Scheme == "http" {
+			case "http":
-				res, err := checkRedirect(location)
+				res, err := r.checkRedirect(u.Scheme, location)
 
 				if !res || err != nil {
-					return res, err
+					// If we don't support http, we remove it from supported protocols
+					server.Protocols = server.Protocols.Remove("http")
+				} else {
+					// Otherwise, we verify https support
+					r.checkProtocol(server, "https")
 				}
+			case "https":
+				// We don't want to allow downgrading, so this is an error.
+				return r.checkRedirect(u.Scheme, location)
 			}
 		}
 
@@ -66,8 +80,20 @@ func checkHttp(server *Server, logFields log.Fields) (bool, error) {
 	return false, nil
 }
 
+func (r *Redirector) checkProtocol(server *Server, scheme string) {
+	res, err := r.checkHttpScheme(server, scheme, log.Fields{})
+
+	if !res || err != nil {
+		return
+	}
+
+	if !server.Protocols.Contains(scheme) {
+		server.Protocols = server.Protocols.Append(scheme)
+	}
+}
+
 // checkRedirect parses a location header response and checks the scheme
-func checkRedirect(locationHeader string) (bool, error) {
+func (r *Redirector) checkRedirect(originatingScheme, locationHeader string) (bool, error) {
 	newUrl, err := url.Parse(locationHeader)
 
 	if err != nil {
@@ -76,20 +102,41 @@ func checkRedirect(locationHeader string) (bool, error) {
 
 	if newUrl.Scheme == "https" {
 		return false, ErrHttpsRedirect
+	} else if originatingScheme == "https" && newUrl.Scheme == "https" {
+		return false, ErrHttpsRedirect
 	}
 
 	return true, nil
 }
 
 // checkTLS checks tls certificates from a host, ensures they're valid, and not expired.
-func checkTLS(server *Server, logFields log.Fields) (bool, error) {
+func (r *Redirector) checkTLS(server *Server, logFields log.Fields) (bool, error) {
-	host, port, err := net.SplitHostPort(server.Host)
+	var host, port string
+	var err error
+
+	if strings.Contains(server.Host, ":") {
+		host, port, err = net.SplitHostPort(server.Host)
+
+		if err != nil {
+			return false, err
+		}
+	} else {
+		host = server.Host
+	}
+
+	log.WithFields(log.Fields{
+		"server": server.Host,
+		"host":   host,
+		"port":   port,
+	}).Info("Checking TLS server")
 
 	if port == "" {
 		port = "443"
 	}
 
-	conn, err := tls.Dial("tcp", host+":"+port, checkTLSConfig)
+	conn, err := tls.Dial("tcp", host+":"+port, &tls.Config{
+		RootCAs: r.config.RootCAs,
+	})
 
 	if err != nil {
 		return false, err
@@ -107,19 +154,39 @@ func checkTLS(server *Server, logFields log.Fields) (bool, error) {
 
 	state := conn.ConnectionState()
 
+	peerPool := x509.NewCertPool()
+
+	for _, intermediate := range state.PeerCertificates {
+		if !intermediate.IsCA {
+			continue
+		}
+
+		peerPool.AddCert(intermediate)
+	}
+
 	opts := x509.VerifyOptions{
+		Roots:         r.config.RootCAs,
+		Intermediates: peerPool,
 		CurrentTime:   time.Now(),
 	}
 
-	for _, cert := range state.PeerCertificates {
+	// We want only the leaf certificate, as this will verify up the chain for us.
+	cert := state.PeerCertificates[0]
+
 	if _, err := cert.Verify(opts); err != nil {
 		logFields["peerCert"] = cert.Subject.String()
+
+		if authErr, ok := err.(x509.UnknownAuthorityError); ok {
+			logFields["authCert"] = authErr.Cert.Subject.String()
+			logFields["ca"] = authErr.Cert.Issuer
+		}
 		return false, err
 	}
+
 	if now.Before(cert.NotBefore) || now.After(cert.NotAfter) {
+		logFields["peerCert"] = cert.Subject.String()
 		return false, err
 	}
-	}
 
 	for _, chain := range state.VerifiedChains {
 		for _, cert := range chain {
@@ -130,5 +197,10 @@ func checkTLS(server *Server, logFields log.Fields) (bool, error) {
 		}
 	}
 
+	// If https is valid, append it
+	if !server.Protocols.Contains("https") {
+		server.Protocols = server.Protocols.Append("https")
+	}
+
 	return true, nil
 }

check_test.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	"crypto/rand"
@@ -58,11 +58,15 @@ var _ = Describe("Check suite", func() {
 		httpServer *httptest.Server
 		server     *Server
 		handler    http.HandlerFunc
+		r          *Redirector
 	)
 	BeforeEach(func() {
 		httpServer = httptest.NewUnstartedServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			handler(w, r)
 		}))
+		r = New(&Config{
+			RootCAs: x509.NewCertPool(),
+		})
 	})
 	AfterEach(func() {
 		httpServer.Close()
@@ -89,7 +93,7 @@ var _ = Describe("Check suite", func() {
 				w.WriteHeader(http.StatusOK)
 			}
 
-			res, err := checkHttp(server, log.Fields{})
+			res, err := r.checkHttpScheme(server, "http", log.Fields{})
 
 			Expect(res).To(BeTrue())
 			Expect(err).To(BeNil())
@@ -100,7 +104,7 @@ var _ = Describe("Check suite", func() {
 				w.WriteHeader(http.StatusMovedPermanently)
 			}
 
-			res, err := checkHttp(server, log.Fields{})
+			res, err := r.checkHttpScheme(server, "http", log.Fields{})
 
 			Expect(res).To(BeFalse())
 			Expect(err).To(Equal(ErrHttpsRedirect))
@@ -141,7 +145,7 @@ var _ = Describe("Check suite", func() {
 				setupCerts(time.Now(), time.Now().Add(24*time.Hour))
 			})
 			It("Should fail due to invalid ca", func() {
-				res, err := checkTLS(server, log.Fields{})
+				res, err := r.checkTLS(server, log.Fields{})
 
 				Expect(res).To(BeFalse())
 				Expect(err).ToNot(BeNil())
@@ -151,20 +155,15 @@ var _ = Describe("Check suite", func() {
 
 				pool.AddCert(x509Cert)
 
-				checkTLSConfig = &tls.Config{RootCAs: pool}
+				r.config.RootCAs = pool
 
-				res, err := checkTLS(server, log.Fields{})
+				res, err := r.checkTLS(server, log.Fields{})
 
 				Expect(res).To(BeFalse())
 				Expect(err).ToNot(BeNil())
-
-				checkTLSConfig = nil
 			})
 		})
 		Context("Expiration tests", func() {
-			AfterEach(func() {
-				checkTLSConfig = nil
-			})
 			It("Should fail due to not yet valid certificate", func() {
 				setupCerts(time.Now().Add(5*time.Hour), time.Now().Add(10*time.Hour))
 
@@ -173,10 +172,10 @@ var _ = Describe("Check suite", func() {
 
 				pool.AddCert(x509Cert)
 
-				checkTLSConfig = &tls.Config{RootCAs: pool}
+				r.config.RootCAs = pool
 
 				// Check TLS
-				res, err := checkTLS(server, log.Fields{})
+				res, err := r.checkTLS(server, log.Fields{})
 
 				Expect(res).To(BeFalse())
 				Expect(err).ToNot(BeNil())
@@ -189,10 +188,10 @@ var _ = Describe("Check suite", func() {
 
 				pool.AddCert(x509Cert)
 
-				checkTLSConfig = &tls.Config{RootCAs: pool}
+				r.config.RootCAs = pool
 
 				// Check TLS
-				res, err := checkTLS(server, log.Fields{})
+				res, err := r.checkTLS(server, log.Fields{})
 
 				Expect(res).To(BeFalse())
 				Expect(err).ToNot(BeNil())

cmd/main.go

@@ -0,0 +1,112 @@
+package main
+
+import (
+	"flag"
+	"github.com/armbian/redirector"
+	"github.com/armbian/redirector/util"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+var (
+	configFlag = flag.String("config", "", "configuration file path")
+	flagDebug  = flag.Bool("debug", false, "Enable debug logging")
+)
+
+func main() {
+	flag.Parse()
+
+	if *flagDebug {
+		log.SetLevel(log.DebugLevel)
+	}
+
+	viper.SetDefault("bind", ":8080")
+	viper.SetDefault("cacheSize", 1024)
+	viper.SetDefault("topChoices", 3)
+	viper.SetDefault("reloadKey", redirector.RandomSequence(32))
+
+	viper.SetConfigName("dlrouter")        // name of config file (without extension)
+	viper.SetConfigType("yaml")            // REQUIRED if the config file does not have the extension in the name
+	viper.AddConfigPath("/etc/dlrouter/")  // path to look for the config file in
+	viper.AddConfigPath("$HOME/.dlrouter") // call multiple times to add many search paths
+	viper.AddConfigPath(".")               // optionally look for config in the working directory
+
+	if *configFlag != "" {
+		viper.SetConfigFile(*configFlag)
+	}
+
+	config := &redirector.Config{}
+
+	loadConfig := func(fatal bool) {
+		log.Info("Reading configuration")
+
+		// Bind reload to reading in the viper config, then deserializing
+		if err := viper.ReadInConfig(); err != nil {
+			log.WithError(err).Error("Unable to unmarshal configuration")
+
+			if fatal {
+				os.Exit(1)
+			}
+		}
+
+		log.Info("Unmarshalling configuration")
+
+		if err := viper.Unmarshal(config); err != nil {
+			log.WithError(err).Error("Unable to unmarshal configuration")
+
+			if fatal {
+				os.Exit(1)
+			}
+		}
+
+		log.Info("Updating root certificates")
+
+		certs, err := util.LoadCACerts()
+
+		if err != nil {
+			log.WithError(err).Error("Unable to load certificates")
+
+			if fatal {
+				os.Exit(1)
+			}
+		}
+
+		config.RootCAs = certs
+	}
+
+	config.ReloadFunc = func() {
+		loadConfig(false)
+	}
+
+	loadConfig(true)
+
+	redir := redirector.New(config)
+
+	// Because we have a bind address, we can start it without the return value.
+	redir.Start()
+
+	log.Info("Ready")
+
+	c := make(chan os.Signal)
+
+	signal.Notify(c, syscall.SIGKILL, syscall.SIGTERM, syscall.SIGHUP)
+
+	for {
+		sig := <-c
+
+		if sig != syscall.SIGHUP {
+			break
+		}
+
+		loadConfig(false)
+
+		err := redir.ReloadConfig()
+
+		if err != nil {
+			log.WithError(err).Warning("Did not reload configuration due to error")
+		}
+	}
+}

config.go

@@ -1,109 +1,149 @@
-package main
+package redirector
 
 import (
+	"crypto/x509"
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/oschwald/maxminddb-golang"
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	log "github.com/sirupsen/logrus"
-	"github.com/spf13/viper"
 	"net"
 	"net/url"
 	"strings"
 	"sync"
 )
 
-func reloadConfig() error {
+type Config struct {
-	log.Info("Loading configuration...")
+	BindAddress string         `mapstructure:"bind"`
+	GeoDBPath   string         `mapstructure:"geodb"`
+	MapFile     string         `mapstructure:"dl_map"`
+	CacheSize   int            `mapstructure:"cacheSize"`
+	TopChoices  int            `mapstructure:"topChoices"`
+	ReloadToken string         `mapstructure:"reloadToken"`
+	ServerList  []ServerConfig `mapstructure:"servers"`
+	ReloadFunc  func()
+	RootCAs     *x509.CertPool
+}
 
-	err := viper.ReadInConfig() // Find and read the config file
+type ProtocolList []string
 
-	if err != nil { // Handle errors reading the config file
+func (p ProtocolList) Contains(value string) bool {
-		return errors.Wrap(err, "Unable to read configuration")
+	for _, val := range p {
+		if value == val {
+			return true
+		}
 	}
 
-	// db will never be reloaded.
+	return false
-	if db == nil {
+}
+
+func (p ProtocolList) Append(value string) ProtocolList {
+	return append(p, value)
+}
+
+func (p ProtocolList) Remove(value string) ProtocolList {
+	index := -1
+
+	for i, val := range p {
+		if value == val {
+			index = i
+			break
+		}
+	}
+
+	if index == -1 {
+		return p
+	}
+
+	p[index] = p[len(p)-1]
+	return p[:len(p)-1]
+}
+
+func (r *Redirector) ReloadConfig() error {
+	log.Info("Loading configuration...")
+
+	var err error
+
 	// Load maxmind database
-		db, err = maxminddb.Open(viper.GetString("geodb"))
+	if r.db != nil {
+		err = r.db.Close()
+
+		if err != nil {
+			return errors.Wrap(err, "Unable to close database")
+		}
+	}
+
+	// db can be hot-reloaded if the file changed
+	r.db, err = maxminddb.Open(r.config.GeoDBPath)
 
 	if err != nil {
 		return errors.Wrap(err, "Unable to open database")
 	}
-	}
 
 	// Refresh server cache if size changed
-	if serverCache == nil {
+	if r.serverCache == nil {
-		serverCache, err = lru.New(viper.GetInt("cacheSize"))
+		r.serverCache, err = lru.New(r.config.CacheSize)
 	} else {
-		serverCache.Resize(viper.GetInt("cacheSize"))
+		r.serverCache.Resize(r.config.CacheSize)
 	}
 
 	// Purge the cache to ensure we don't have any invalid servers in it
-	serverCache.Purge()
+	r.serverCache.Purge()
-
-	// Set top choice count
-	topChoices = viper.GetInt("topChoices")
 
 	// Reload map file
-	if err := reloadMap(); err != nil {
+	if err := r.reloadMap(); err != nil {
 		return errors.Wrap(err, "Unable to load map file")
 	}
 
 	// Reload server list
-	if err := reloadServers(); err != nil {
+	if err := r.reloadServers(); err != nil {
 		return errors.Wrap(err, "Unable to load servers")
 	}
 
 	// Create mirror map
 	mirrors := make(map[string][]*Server)
 
-	for _, server := range servers {
+	for _, server := range r.servers {
 		mirrors[server.Continent] = append(mirrors[server.Continent], server)
 	}
 
 	mirrors["default"] = append(mirrors["NA"], mirrors["EU"]...)
 
-	regionMap = mirrors
+	r.regionMap = mirrors
 
 	hosts := make(map[string]*Server)
 
-	for _, server := range servers {
+	for _, server := range r.servers {
 		hosts[server.Host] = server
 	}
 
-	hostMap = hosts
+	r.hostMap = hosts
 
 	// Check top choices size
-	if topChoices > len(servers) {
+	if r.config.TopChoices > len(r.servers) {
-		topChoices = len(servers)
+		r.config.TopChoices = len(r.servers)
 	}
 
 	// Force check
-	go servers.Check()
+	go r.servers.Check(r.checks)
 
 	return nil
 }
 
-func reloadServers() error {
+func (r *Redirector) reloadServers() error {
-	var serverList []ServerConfig
+	log.WithField("count", len(r.config.ServerList)).Info("Loading servers")
-
-	if err := viper.UnmarshalKey("servers", &serverList); err != nil {
-		return err
-	}
-
 	var wg sync.WaitGroup
 
 	existing := make(map[string]int)
 
-	for i, server := range servers {
+	for i, server := range r.servers {
 		existing[server.Host] = i
 	}
 
 	hosts := make(map[string]bool)
 
-	for _, server := range serverList {
+	for _, server := range r.config.ServerList {
 		wg.Add(1)
 
 		var prefix string
@@ -133,19 +173,19 @@ func reloadServers() error {
 		go func(i int, server ServerConfig, u *url.URL) {
 			defer wg.Done()
 
-			s := addServer(server, u)
+			s := r.addServer(server, u)
 
 			if _, ok := existing[u.Host]; ok {
-				s.Redirects = servers[i].Redirects
+				s.Redirects = r.servers[i].Redirects
 
-				servers[i] = s
+				r.servers[i] = s
 			} else {
 				s.Redirects = promauto.NewCounter(prometheus.CounterOpts{
 					Name: "armbian_router_redirects_" + metricReplacer.Replace(u.Host),
 					Help: "The number of redirects for server " + u.Host,
 				})
 
-				servers = append(servers, s)
+				r.servers = append(r.servers, s)
 
 				log.WithFields(log.Fields{
 					"server":    u.Host,
@@ -160,16 +200,16 @@ func reloadServers() error {
 	wg.Wait()
 
 	// Remove servers that no longer exist in the config
-	for i := len(servers) - 1; i >= 0; i-- {
+	for i := len(r.servers) - 1; i >= 0; i-- {
-		if _, exists := hosts[servers[i].Host]; exists {
+		if _, exists := hosts[r.servers[i].Host]; exists {
 			continue
 		}
 
 		log.WithFields(log.Fields{
-			"server": servers[i].Host,
+			"server": r.servers[i].Host,
 		}).Info("Removed server")
 
-		servers = append(servers[:i], servers[i+1:]...)
+		r.servers = append(r.servers[:i], r.servers[i+1:]...)
 	}
 
 	return nil
@@ -179,7 +219,7 @@ var metricReplacer = strings.NewReplacer(".", "_", "-", "_")
 
 // addServer takes ServerConfig and constructs a server.
 // This will create duplicate servers, but it will overwrite existing ones when changed.
-func addServer(server ServerConfig, u *url.URL) *Server {
+func (r *Redirector) addServer(server ServerConfig, u *url.URL) *Server {
 	s := &Server{
 		Available: true,
 		Host:      u.Host,
@@ -188,6 +228,15 @@ func addServer(server ServerConfig, u *url.URL) *Server {
 		Longitude: server.Longitude,
 		Continent: server.Continent,
 		Weight:    server.Weight,
+		Protocols: ProtocolList{"http", "https"},
+	}
+
+	if len(server.Protocols) > 0 {
+		for _, proto := range server.Protocols {
+			if !s.Protocols.Contains(proto) {
+				s.Protocols = s.Protocols.Append(proto)
+			}
+		}
 	}
 
 	// Defaults to 10 to allow servers to be set lower for lower priority
@@ -206,7 +255,7 @@ func addServer(server ServerConfig, u *url.URL) *Server {
 	}
 
 	var city City
-	err = db.Lookup(ips[0], &city)
+	err = r.db.Lookup(ips[0], &city)
 
 	if err != nil {
 		log.WithFields(log.Fields{
@@ -229,8 +278,8 @@ func addServer(server ServerConfig, u *url.URL) *Server {
 	return s
 }
 
-func reloadMap() error {
+func (r *Redirector) reloadMap() error {
-	mapFile := viper.GetString("dl_map")
+	mapFile := r.config.MapFile
 
 	if mapFile == "" {
 		return nil
@@ -244,7 +293,7 @@ func reloadMap() error {
 		return err
 	}
 
-	dlMap = newMap
+	r.dlMap = newMap
 
 	return nil
 }

dlrouter.yaml

@@ -34,6 +34,10 @@ servers:
     - server: mirrors.bfsu.edu.cn/armbian/
     - server: mirrors.dotsrc.org/armbian-apt/
       weight: 15
+      protocols:
+        - http
+        - https
+        - rsync
     - server: mirrors.netix.net/armbian/apt/
     - server: mirrors.nju.edu.cn/armbian/
     - server: mirrors.sustech.edu.cn/armbian/

go.mod

@@ -1,10 +1,11 @@
-module meow.tf/armbian-router
+module github.com/armbian/redirector
 
-go 1.17
+go 1.19
 
 require (
 	github.com/chi-middleware/logrus-logger v0.2.0
 	github.com/go-chi/chi/v5 v5.0.7
+	github.com/gwatts/rootcerts v0.0.0-20220501184621-6eac2dff0b8d
 	github.com/hashicorp/golang-lru v0.5.4
 	github.com/jmcvetta/randutil v0.0.0-20150817122601-2bb1b664bcff
 	github.com/onsi/ginkgo/v2 v2.1.4

go.sum

@@ -128,7 +128,6 @@ github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
 github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
@@ -198,7 +197,6 @@ github.com/google/pprof v0.0.0-20201023163331-3e6fc7fc9c4c/go.mod h1:kpwsk12EmLe
 github.com/google/pprof v0.0.0-20201203190320-1bf35d6f28c2/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210122040257-d980be63207e/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210226084205-cbba55b83ad5/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
-github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
 github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210601050228-01bbb1931b22/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210609004039-a478d1d731e9/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
@@ -210,6 +208,8 @@ github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5m
 github.com/googleapis/gax-go/v2 v2.1.0/go.mod h1:Q3nei7sK6ybPYH7twZdmQpAd1MKb7pfu6SK+H1/DsU0=
 github.com/googleapis/gax-go/v2 v2.1.1/go.mod h1:hddJymUZASv3XPyGkUpKj8pPO47Rmb0eJc8R6ouapiM=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
+github.com/gwatts/rootcerts v0.0.0-20220501184621-6eac2dff0b8d h1:Kp5G1kHMb2fAD9OiqWDXro4qLB8bQ2NusoorYya4Lbo=
+github.com/gwatts/rootcerts v0.0.0-20220501184621-6eac2dff0b8d/go.mod h1:5Kt9XkWvkGi2OHOq0QsGxebHmhCcqJ8KCbNg/a6+n+g=
 github.com/hashicorp/consul/api v1.12.0/go.mod h1:6pVBMo0ebnYdt2S3H87XhekM/HHrUoTD2XXb/VrZVy0=
 github.com/hashicorp/consul/sdk v0.8.0/go.mod h1:GBvyrGALthsZObzUGsfgHZQDXjg4lOjagTIwIR1vPms=
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
@@ -680,7 +680,6 @@ golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.3/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.4/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
-golang.org/x/tools v0.1.10 h1:QjFRCZxdOhBJ/UNgnBZLbNV13DlbnK0quyivTnXJM20=
 golang.org/x/tools v0.1.10/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=

http.go

@@ -1,10 +1,9 @@
-package main
+package redirector
 
 import (
 	"encoding/json"
 	"fmt"
 	"github.com/jmcvetta/randutil"
-	"github.com/spf13/viper"
 	"net"
 	"net/http"
 	"net/url"
@@ -14,10 +13,10 @@ import (
 )
 
 // statusHandler is a simple handler that will always return 200 OK with a body of "OK"
-func statusHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) statusHandler(w http.ResponseWriter, req *http.Request) {
 	w.WriteHeader(http.StatusOK)
 
-	if r.Method != http.MethodHead {
+	if req.Method != http.MethodHead {
 		w.Write([]byte("OK"))
 	}
 }
@@ -25,8 +24,8 @@ func statusHandler(w http.ResponseWriter, r *http.Request) {
 // redirectHandler is the default "not found" handler which handles redirects
 // if the environment variable OVERRIDE_IP is set, it will use that ip address
 // this is useful for local testing when you're on the local network
-func redirectHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) redirectHandler(w http.ResponseWriter, req *http.Request) {
-	ipStr, _, err := net.SplitHostPort(r.RemoteAddr)
+	ipStr, _, err := net.SplitHostPort(req.RemoteAddr)
 
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -50,11 +49,11 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 
 	// If the path has a prefix of region/NA, it will use specific regions instead
 	// of the default geographical distance
-	if strings.HasPrefix(r.URL.Path, "/region") {
+	if strings.HasPrefix(req.URL.Path, "/region") {
-		parts := strings.Split(r.URL.Path, "/")
+		parts := strings.Split(req.URL.Path, "/")
 
 		// region = parts[2]
-		if mirrors, ok := regionMap[parts[2]]; ok {
+		if mirrors, ok := r.regionMap[parts[2]]; ok {
 			choices := make([]randutil.Choice, len(mirrors))
 
 			for i, item := range mirrors {
@@ -77,13 +76,20 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 
 			server = choice.Item.(*Server)
 
-			r.URL.Path = strings.Join(parts[3:], "/")
+			req.URL.Path = strings.Join(parts[3:], "/")
 		}
 	}
 
+	// If we don't have a scheme, we'll use http by default
+	scheme := req.URL.Scheme
+
+	if scheme == "" {
+		scheme = "http"
+	}
+
 	// If none of the above exceptions are matched, we use the geographical distance based on IP
 	if server == nil {
-		server, distance, err = servers.Closest(ip)
+		server, distance, err = r.servers.Closest(r, scheme, ip)
 
 		if err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -91,27 +97,20 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	// If we don't have a scheme, we'll use https by default
-	scheme := r.URL.Scheme
-
-	if scheme == "" {
-		scheme = "https"
-	}
-
 	// redirectPath is a combination of server path (which can be something like /armbian)
 	// and the URL path.
 	// Example: /armbian + /some/path = /armbian/some/path
-	redirectPath := path.Join(server.Path, r.URL.Path)
+	redirectPath := path.Join(server.Path, req.URL.Path)
 
 	// If we have a dlMap, we map the url to a final path instead
-	if dlMap != nil {
+	if r.dlMap != nil {
-		if newPath, exists := dlMap[strings.TrimLeft(r.URL.Path, "/")]; exists {
+		if newPath, exists := r.dlMap[strings.TrimLeft(req.URL.Path, "/")]; exists {
 			downloadsMapped.Inc()
 			redirectPath = path.Join(server.Path, newPath)
 		}
 	}
 
-	if strings.HasSuffix(r.URL.Path, "/") && !strings.HasSuffix(redirectPath, "/") {
+	if strings.HasSuffix(req.URL.Path, "/") && !strings.HasSuffix(redirectPath, "/") {
 		redirectPath += "/"
 	}
 
@@ -136,15 +135,13 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 
 // reloadHandler is an http handler which lets us reload the server configuration
 // It is only enabled when the reloadToken is set in the configuration
-func reloadHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) reloadHandler(w http.ResponseWriter, req *http.Request) {
-	expectedToken := viper.GetString("reloadToken")
+	if r.config.ReloadToken == "" {
-
-	if expectedToken == "" {
 		w.WriteHeader(http.StatusUnauthorized)
 		return
 	}
 
-	token := r.Header.Get("Authorization")
+	token := req.Header.Get("Authorization")
 
 	if token == "" || !strings.HasPrefix(token, "Bearer") || !strings.Contains(token, " ") {
 		w.WriteHeader(http.StatusUnauthorized)
@@ -153,12 +150,12 @@ func reloadHandler(w http.ResponseWriter, r *http.Request) {
 
 	token = token[strings.Index(token, " ")+1:]
 
-	if token != expectedToken {
+	if token != r.config.ReloadToken {
 		w.WriteHeader(http.StatusUnauthorized)
 		return
 	}
 
-	if err := reloadConfig(); err != nil {
+	if err := r.ReloadConfig(); err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))
 		return
@@ -168,19 +165,19 @@ func reloadHandler(w http.ResponseWriter, r *http.Request) {
 	w.Write([]byte("OK"))
 }
 
-func dlMapHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) dlMapHandler(w http.ResponseWriter, req *http.Request) {
-	if dlMap == nil {
+	if r.dlMap == nil {
 		w.WriteHeader(http.StatusNotFound)
 		return
 	}
 
 	w.Header().Set("Content-Type", "application/json")
 
-	json.NewEncoder(w).Encode(dlMap)
+	json.NewEncoder(w).Encode(r.dlMap)
 }
 
-func geoIPHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) geoIPHandler(w http.ResponseWriter, req *http.Request) {
-	ipStr, _, err := net.SplitHostPort(r.RemoteAddr)
+	ipStr, _, err := net.SplitHostPort(req.RemoteAddr)
 
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -190,7 +187,7 @@ func geoIPHandler(w http.ResponseWriter, r *http.Request) {
 	ip := net.ParseIP(ipStr)
 
 	var city City
-	err = db.Lookup(ip, &city)
+	err = r.db.Lookup(ip, &city)
 
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)

main.go

@@ -1,154 +0,0 @@
-package main
-
-import (
-	"flag"
-	"github.com/chi-middleware/logrus-logger"
-	"github.com/go-chi/chi/v5"
-	lru "github.com/hashicorp/golang-lru"
-	"github.com/oschwald/maxminddb-golang"
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
-	log "github.com/sirupsen/logrus"
-	"github.com/spf13/viper"
-	"net/http"
-	"os"
-	"os/signal"
-	"syscall"
-)
-
-var (
-	db         *maxminddb.Reader
-	servers    ServerList
-	regionMap  map[string][]*Server
-	hostMap    map[string]*Server
-	dlMap      map[string]string
-	topChoices int
-
-	redirectsServed = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "armbian_router_redirects",
-		Help: "The total number of processed redirects",
-	})
-
-	downloadsMapped = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "armbian_router_download_maps",
-		Help: "The total number of mapped download paths",
-	})
-
-	serverCache *lru.Cache
-)
-
-type LocationLookup struct {
-	Location struct {
-		Latitude  float64 `maxminddb:"latitude"`
-		Longitude float64 `maxminddb:"longitude"`
-	} `maxminddb:"location"`
-}
-
-// City represents a MaxmindDB city
-type City struct {
-	Continent struct {
-		Code      string            `maxminddb:"code" json:"code"`
-		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
-		Names     map[string]string `maxminddb:"names" json:"names"`
-	} `maxminddb:"continent" json:"continent"`
-	Country struct {
-		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
-		IsoCode   string            `maxminddb:"iso_code" json:"iso_code"`
-		Names     map[string]string `maxminddb:"names" json:"names"`
-	} `maxminddb:"country" json:"country"`
-	Location struct {
-		AccuracyRadius uint16  `maxminddb:"accuracy_radius" json:'accuracy_radius'`
-		Latitude       float64 `maxminddb:"latitude" json:"latitude"`
-		Longitude      float64 `maxminddb:"longitude" json:"longitude"`
-	} `maxminddb:"location"`
-	RegisteredCountry struct {
-		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
-		IsoCode   string            `maxminddb:"iso_code" json:"iso_code"`
-		Names     map[string]string `maxminddb:"names" json:"names"`
-	} `maxminddb:"registered_country" json:"registered_country"`
-}
-
-type ServerConfig struct {
-	Server    string  `mapstructure:"server" yaml:"server"`
-	Latitude  float64 `mapstructure:"latitude" yaml:"latitude"`
-	Longitude float64 `mapstructure:"longitude" yaml:"longitude"`
-	Continent string  `mapstructure:"continent"`
-	Weight    int     `mapstructure:"weight" yaml:"weight"`
-}
-
-var (
-	configFlag = flag.String("config", "", "configuration file path")
-	flagDebug  = flag.Bool("debug", false, "Enable debug logging")
-)
-
-func main() {
-	flag.Parse()
-
-	if *flagDebug {
-		log.SetLevel(log.DebugLevel)
-	}
-
-	viper.SetDefault("bind", ":8080")
-	viper.SetDefault("cacheSize", 1024)
-	viper.SetDefault("topChoices", 3)
-	viper.SetDefault("reloadKey", randSeq(32))
-
-	viper.SetConfigName("dlrouter")        // name of config file (without extension)
-	viper.SetConfigType("yaml")            // REQUIRED if the config file does not have the extension in the name
-	viper.AddConfigPath("/etc/dlrouter/")  // path to look for the config file in
-	viper.AddConfigPath("$HOME/.dlrouter") // call multiple times to add many search paths
-	viper.AddConfigPath(".")               // optionally look for config in the working directory
-
-	if *configFlag != "" {
-		viper.SetConfigFile(*configFlag)
-	}
-
-	if err := reloadConfig(); err != nil {
-		log.WithError(err).Fatalln("Unable to load configuration")
-	}
-
-	// Start check loop
-	go servers.checkLoop()
-
-	log.Info("Starting")
-
-	r := chi.NewRouter()
-
-	r.Use(RealIPMiddleware)
-	r.Use(logger.Logger("router", log.StandardLogger()))
-
-	r.Head("/status", statusHandler)
-	r.Get("/status", statusHandler)
-	r.Get("/mirrors", legacyMirrorsHandler)
-	r.Get("/mirrors/{server}.svg", mirrorStatusHandler)
-	r.Get("/mirrors.json", mirrorsHandler)
-	r.Post("/reload", reloadHandler)
-	r.Get("/dl_map", dlMapHandler)
-	r.Get("/geoip", geoIPHandler)
-	r.Get("/metrics", promhttp.Handler().ServeHTTP)
-
-	r.NotFound(redirectHandler)
-
-	go http.ListenAndServe(viper.GetString("bind"), r)
-
-	log.Info("Ready")
-
-	c := make(chan os.Signal)
-
-	signal.Notify(c, syscall.SIGKILL, syscall.SIGTERM, syscall.SIGHUP)
-
-	for {
-		sig := <-c
-
-		if sig != syscall.SIGHUP {
-			break
-		}
-
-		err := reloadConfig()
-
-		if err != nil {
-			log.WithError(err).Warning("Did not reload configuration due to error")
-		}
-	}
-}

map.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	"encoding/csv"

map_test.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	. "github.com/onsi/ginkgo/v2"

middleware/middleware.go

@@ -1,4 +1,4 @@
-package main
+package middleware
 
 import (
 	"net"

mirrors.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	_ "embed"
@@ -11,16 +11,16 @@ import (
 
 // legacyMirrorsHandler will list the mirrors by region in the legacy format
 // it is preferred to use mirrors.json, but this handler is here for build support
-func legacyMirrorsHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) legacyMirrorsHandler(w http.ResponseWriter, req *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 
 	mirrorOutput := make(map[string][]string)
 
-	for region, mirrors := range regionMap {
+	for region, mirrors := range r.regionMap {
 		list := make([]string, len(mirrors))
 
 		for i, mirror := range mirrors {
-			list[i] = r.URL.Scheme + "://" + mirror.Host + "/" + strings.TrimLeft(mirror.Path, "/")
+			list[i] = req.URL.Scheme + "://" + mirror.Host + "/" + strings.TrimLeft(mirror.Path, "/")
 		}
 
 		mirrorOutput[region] = list
@@ -30,9 +30,9 @@ func legacyMirrorsHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 // mirrorsHandler is a simple handler that will return the list of servers
-func mirrorsHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) mirrorsHandler(w http.ResponseWriter, req *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
-	json.NewEncoder(w).Encode(servers)
+	json.NewEncoder(w).Encode(r.servers)
 }
 
 var (
@@ -48,8 +48,8 @@ var (
 
 // mirrorStatusHandler is a fancy svg-returning handler.
 // it is used to display mirror statuses on a config repo of sorts
-func mirrorStatusHandler(w http.ResponseWriter, r *http.Request) {
+func (r *Redirector) mirrorStatusHandler(w http.ResponseWriter, req *http.Request) {
-	serverHost := chi.URLParam(r, "server")
+	serverHost := chi.URLParam(req, "server")
 
 	w.Header().Set("Content-Type", "image/svg+xml;charset=utf-8")
 	w.Header().Set("Cache-Control", "max-age=120")
@@ -61,7 +61,7 @@ func mirrorStatusHandler(w http.ResponseWriter, r *http.Request) {
 
 	serverHost = strings.Replace(serverHost, "_", ".", -1)
 
-	server, ok := hostMap[serverHost]
+	server, ok := r.hostMap[serverHost]
 
 	if !ok {
 		w.Header().Set("Content-Length", strconv.Itoa(len(statusUnknown)))
@@ -77,7 +77,7 @@ func mirrorStatusHandler(w http.ResponseWriter, r *http.Request) {
 
 	w.Header().Set("ETag", "\""+key+"\"")
 
-	if match := r.Header.Get("If-None-Match"); match != "" {
+	if match := req.Header.Get("If-None-Match"); match != "" {
 		if strings.Trim(match, "\"") == key {
 			w.WriteHeader(http.StatusNotModified)
 			return

redirector.go

@@ -0,0 +1,130 @@
+package redirector
+
+import (
+	"github.com/armbian/redirector/middleware"
+	"github.com/chi-middleware/logrus-logger"
+	"github.com/go-chi/chi/v5"
+	lru "github.com/hashicorp/golang-lru"
+	"github.com/oschwald/maxminddb-golang"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+)
+
+var (
+	redirectsServed = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "armbian_router_redirects",
+		Help: "The total number of processed redirects",
+	})
+
+	downloadsMapped = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "armbian_router_download_maps",
+		Help: "The total number of mapped download paths",
+	})
+)
+
+type Redirector struct {
+	config      *Config
+	db          *maxminddb.Reader
+	servers     ServerList
+	regionMap   map[string][]*Server
+	hostMap     map[string]*Server
+	dlMap       map[string]string
+	topChoices  int
+	serverCache *lru.Cache
+	checks      []ServerCheck
+}
+
+type LocationLookup struct {
+	Location struct {
+		Latitude  float64 `maxminddb:"latitude"`
+		Longitude float64 `maxminddb:"longitude"`
+	} `maxminddb:"location"`
+}
+
+// City represents a MaxmindDB city
+type City struct {
+	Continent struct {
+		Code      string            `maxminddb:"code" json:"code"`
+		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
+		Names     map[string]string `maxminddb:"names" json:"names"`
+	} `maxminddb:"continent" json:"continent"`
+	Country struct {
+		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
+		IsoCode   string            `maxminddb:"iso_code" json:"iso_code"`
+		Names     map[string]string `maxminddb:"names" json:"names"`
+	} `maxminddb:"country" json:"country"`
+	Location struct {
+		AccuracyRadius uint16  `maxminddb:"accuracy_radius" json:'accuracy_radius'`
+		Latitude       float64 `maxminddb:"latitude" json:"latitude"`
+		Longitude      float64 `maxminddb:"longitude" json:"longitude"`
+	} `maxminddb:"location"`
+	RegisteredCountry struct {
+		GeoNameID uint              `maxminddb:"geoname_id" json:"geoname_id"`
+		IsoCode   string            `maxminddb:"iso_code" json:"iso_code"`
+		Names     map[string]string `maxminddb:"names" json:"names"`
+	} `maxminddb:"registered_country" json:"registered_country"`
+}
+
+type ServerConfig struct {
+	Server    string   `mapstructure:"server" yaml:"server"`
+	Latitude  float64  `mapstructure:"latitude" yaml:"latitude"`
+	Longitude float64  `mapstructure:"longitude" yaml:"longitude"`
+	Continent string   `mapstructure:"continent"`
+	Weight    int      `mapstructure:"weight" yaml:"weight"`
+	Protocols []string `mapstructure:"protocols" yaml:"protocols"`
+}
+
+// New creates a new instance of Redirector
+func New(config *Config) *Redirector {
+	r := &Redirector{
+		config: config,
+	}
+
+	r.checks = []ServerCheck{
+		r.checkHttp("http"),
+		r.checkTLS,
+	}
+
+	return r
+}
+
+func (r *Redirector) Start() http.Handler {
+	if err := r.ReloadConfig(); err != nil {
+		log.WithError(err).Fatalln("Unable to load configuration")
+	}
+
+	log.Info("Starting check loop")
+
+	// Start check loop
+	go r.servers.checkLoop(r.checks)
+
+	log.Info("Setting up routes")
+
+	router := chi.NewRouter()
+
+	router.Use(middleware.RealIPMiddleware)
+	router.Use(logger.Logger("router", log.StandardLogger()))
+
+	router.Head("/status", r.statusHandler)
+	router.Get("/status", r.statusHandler)
+	router.Get("/mirrors", r.legacyMirrorsHandler)
+	router.Get("/mirrors/{server}.svg", r.mirrorStatusHandler)
+	router.Get("/mirrors.json", r.mirrorsHandler)
+	router.Post("/reload", r.reloadHandler)
+	router.Get("/dl_map", r.dlMapHandler)
+	router.Get("/geoip", r.geoIPHandler)
+	router.Get("/metrics", promhttp.Handler().ServeHTTP)
+
+	router.NotFound(r.redirectHandler)
+
+	if r.config.BindAddress != "" {
+		log.WithField("bind", r.config.BindAddress).Info("Binding to address")
+
+		go http.ListenAndServe(r.config.BindAddress, router)
+	}
+
+	return router
+}

servers.go

@@ -1,7 +1,6 @@
-package main
+package redirector
 
 import (
-	"crypto/tls"
 	"github.com/jmcvetta/randutil"
 	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
@@ -20,13 +19,6 @@ var (
 			return http.ErrUseLastResponse
 		},
 	}
-
-	checkTLSConfig *tls.Config = nil
-
-	checks = []serverCheck{
-		checkHttp,
-		checkTLS,
-	}
 )
 
 // Server represents a download server
@@ -38,14 +30,15 @@ type Server struct {
 	Longitude  float64            `json:"longitude"`
 	Weight     int                `json:"weight"`
 	Continent  string             `json:"continent"`
+	Protocols  ProtocolList       `json:"protocols"`
 	Redirects  prometheus.Counter `json:"-"`
 	LastChange time.Time          `json:"lastChange"`
 }
 
-type serverCheck func(server *Server, logFields log.Fields) (bool, error)
+type ServerCheck func(server *Server, logFields log.Fields) (bool, error)
 
 // checkStatus runs all status checks against a server
-func (server *Server) checkStatus() {
+func (server *Server) checkStatus(checks []ServerCheck) {
 	logFields := log.Fields{
 		"host": server.Host,
 	}
@@ -87,19 +80,19 @@ func (server *Server) checkStatus() {
 
 type ServerList []*Server
 
-func (s ServerList) checkLoop() {
+func (s ServerList) checkLoop(checks []ServerCheck) {
 	t := time.NewTicker(60 * time.Second)
 
 	for {
 		<-t.C
-		s.Check()
+		s.Check(checks)
 	}
 }
 
 // Check will request the index from all servers
 // If a server does not respond in 10 seconds, it is considered offline.
 // This will wait until all checks are complete.
-func (s ServerList) Check() {
+func (s ServerList) Check(checks []ServerCheck) {
 	var wg sync.WaitGroup
 
 	for _, server := range s {
@@ -108,7 +101,7 @@ func (s ServerList) Check() {
 		go func(server *Server) {
 			defer wg.Done()
 
-			server.checkStatus()
+			server.checkStatus(checks)
 		}(server)
 	}
 
@@ -127,12 +120,12 @@ type DistanceList []ComputedDistance
 // Closest will use GeoIP on the IP provided and find the closest servers.
 // When we have a list of x servers closest, we can choose a random or weighted one.
 // Return values are the closest server, the distance, and if an error occurred.
-func (s ServerList) Closest(ip net.IP) (*Server, float64, error) {
+func (s ServerList) Closest(r *Redirector, scheme string, ip net.IP) (*Server, float64, error) {
-	choiceInterface, exists := serverCache.Get(ip.String())
+	choiceInterface, exists := r.serverCache.Get(scheme + "_" + ip.String())
 
 	if !exists {
 		var city LocationLookup
-		err := db.Lookup(ip, &city)
+		err := r.db.Lookup(ip, &city)
 
 		if err != nil {
 			return nil, -1, err
@@ -141,7 +134,7 @@ func (s ServerList) Closest(ip net.IP) (*Server, float64, error) {
 		c := make(DistanceList, len(s))
 
 		for i, server := range s {
-			if !server.Available {
+			if !server.Available || !server.Protocols.Contains(scheme) {
 				continue
 			}
 
@@ -158,9 +151,9 @@ func (s ServerList) Closest(ip net.IP) (*Server, float64, error) {
 			return c[i].Distance < c[j].Distance
 		})
 
-		choiceCount := topChoices
+		choiceCount := r.config.TopChoices
 
-		if len(c) < topChoices {
+		if len(c) < r.config.TopChoices {
 			choiceCount = len(c)
 		}
 
@@ -179,7 +172,7 @@ func (s ServerList) Closest(ip net.IP) (*Server, float64, error) {
 
 		choiceInterface = choices
 
-		serverCache.Add(ip.String(), choiceInterface)
+		r.serverCache.Add(scheme+"_"+ip.String(), choiceInterface)
 	}
 
 	choice, err := randutil.WeightedChoice(choiceInterface.([]randutil.Choice))
@@ -192,9 +185,9 @@ func (s ServerList) Closest(ip net.IP) (*Server, float64, error) {
 
 	if !dist.Server.Available {
 		// Choose a new server and refresh cache
-		serverCache.Remove(ip.String())
+		r.serverCache.Remove(scheme + "_" + ip.String())
 
-		return s.Closest(ip)
+		return s.Closest(r, scheme, ip)
 	}
 
 	return dist.Server, dist.Distance, nil
@@ -206,6 +199,7 @@ func hsin(theta float64) float64 {
 }
 
 // Distance function returns the distance (in meters) between two points of
+//
 //	a given longitude and latitude relatively accurately (using a spherical
 //	approximation of the Earth) through the Haversine Distance Formula for
 //	great arc distance on a sphere with accuracy for small distances

util.go

@@ -1,10 +1,10 @@
-package main
+package redirector
 
 import "math/rand"
 
 var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 
-func randSeq(n int) string {
+func RandomSequence(n int) string {
 	b := make([]rune, n)
 	for i := range b {
 		b[i] = letters[rand.Intn(len(letters))]

util/certificates.go

@@ -0,0 +1,46 @@
+package util
+
+import (
+	"crypto/x509"
+	"github.com/gwatts/rootcerts/certparse"
+	log "github.com/sirupsen/logrus"
+	"net/http"
+)
+
+const (
+	defaultDownloadURL = "https://github.com/mozilla/gecko-dev/blob/master/security/nss/lib/ckfw/builtins/certdata.txt?raw=true"
+)
+
+func LoadCACerts() (*x509.CertPool, error) {
+	res, err := http.Get(defaultDownloadURL)
+
+	if err != nil {
+		return nil, err
+	}
+
+	defer res.Body.Close()
+
+	certs, err := certparse.ReadTrustedCerts(res.Body)
+
+	if err != nil {
+		return nil, err
+	}
+
+	pool := x509.NewCertPool()
+
+	var count int
+
+	for _, cert := range certs {
+		if cert.Trust&certparse.ServerTrustedDelegator == 0 {
+			continue
+		}
+
+		count++
+
+		pool.AddCert(cert.Cert)
+	}
+
+	log.WithField("certs", count).Info("Loaded root cas")
+
+	return pool, nil
+}