Cleanup hosts map

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

.drone.yml

@@ -3,6 +3,18 @@ name: default
 type: docker
 
 steps:
+  - name: test
+    image: golang:alpine
+    volumes:
+      - name: build
+        path: /build
+    commands:
+      - go mod download
+      - go install -mod=mod github.com/onsi/ginkgo/v2/ginkgo
+      - ginkgo --randomize-all --p --cover --coverprofile=cover.out .
+      - go tool cover -func=cover.out
+    environment:
+      CGO_ENABLED: '0'
   - name: build
     image: tystuyfzand/goc:latest
     volumes:
@@ -11,10 +23,12 @@ steps:
     commands:
       - mkdir -p /build
       - go mod download
+      - export CGO_ENABLED=0
       - goc -o /build/dlrouter
     environment:
       GOOS: linux,windows,darwin
       GOARCH: 386,amd64,arm,arm64
+    depends_on: [ test ]
   - name: release
     image: plugins/gitea-release
     volumes:
@@ -36,6 +50,19 @@ steps:
         from_secret: gitea_token
     when:
       event: tag
+    depends_on: [ build ]
+  - name: docker
+    image: plugins/docker
+    settings:
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+      repo: registry.meow.tf/tyler/armbian-router
+      registry: registry.meow.tf
+    depends_on: [ test ]
+    when:
+      event: tag
 volumes:
   - name: build
     temp: {}

.gitignore

@@ -1 +1,7 @@
 *.mmdb
+userdata.csv
+dlrouter-apt.yaml
+*.yaml
+!dlrouter.yaml
+*.exe
+cover.out

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:alpine AS builder
+
+ADD . /src
+
+WORKDIR /src
+
+RUN apk add --no-cache git && \
+	export CGO_ENABLED=0 && \
+    go build -o /src/dlrouter
+
+FROM alpine
+
+COPY --from=builder /src/dlrouter /usr/bin/dlrouter
+
+CMD "/usr/bin/dlrouter"

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2022 Tyler Stuyfzand <admin@meow.tf>
+Copyright (c) 2022 Tyler Stuyfzand <admin@meow.tf>, Armbian Project
 
 Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
 

README.md

@@ -0,0 +1,145 @@
+Armbian Redirector
+==================
+
+This repository contains a redirect service for Armbian downloads, apt, etc.
+
+It uses multiple current technologies and best practices, including:
+
+- Go 1.19
+- Ginkgo v2 and Gomega testing framework
+- GeoIP + Distance routing
+- Server weighting, pooling (top x servers are served instead of a single one)
+- Health checks (HTTP, TLS)
+
+Code Quality
+------------
+
+The code quality isn't the greatest/top tier. Work is being done towards cleaning it up and standardizing it, writing tests, etc.
+
+All contributions are welcome, see the `check_test.go` file for example tests.
+
+Checks
+------
+
+The supported checks are HTTP and TLS.
+
+### HTTP
+
+Verifies server accessibility via HTTP. If the server returns a forced redirect to an `https://` url, it is considered to be https-only.
+
+If the server responds on the `https` url with a forced `http` redirect, it will be marked down due to misconfiguration. Requests should never downgrade.
+
+### TLS
+
+Certificate checking to ensure no servers are used which have invalid/expired certificates. This check is written to use the Mozilla ca certificate list, loaded on start/config load, to verify roots.
+
+OS certificate trusts WERE being used to do this, however some issues with the date validation (which could be user error) caused the move to the ca bundle, which could be considered more usable.
+
+Note: This downloads from github every startup/reload. This should be a reliable process, as long as Mozilla doesn't deprecate their repo. Their HG URL is super slow.
+
+Configuration
+-------------
+
+### Modes
+
+#### Redirect
+
+Standard redirect functionality
+
+#### Download Mapping
+
+Uses the `dl_map` configuration variable to enable mapping of paths to new paths.
+
+Think symlinks, but in a generated file.
+
+### Mirrors
+Mirror targets with trailing slash are placed in the yaml configuration file.
+
+### Example YAML
+```yaml
+# GeoIP Database Path
+geodb: GeoLite2-City.mmdb
+
+# Comment out to disable
+dl_map: userdata.csv
+
+# LRU Cache Size (in items)
+cacheSize: 1024
+
+# Server definition
+# Weights are just like nginx, where if it's > 1 it'll be chosen x out of x + total times
+# By default, the top 3 servers are used for choosing the best.
+# server = full url or host+path
+# weight = int
+# optional: latitude, longitude (float)
+# optional: protocols (list/array)
+servers:
+  - server: armbian.12z.eu/apt/
+  - server: armbian.chi.auroradev.org/apt/
+    weight: 15
+    latitude: 41.8879
+    longitude: -88.1995
+  # Example of a server with additional protocols (rsync)
+  # Useful for defining servers which could be used for rsync sources
+  - server: mirrors.dotsrc.org/armbian-apt/
+    weight: 15
+    protocols:
+      - rsync
+````
+
+## API
+
+`/status`
+
+Meant for a simple health check (nginx/etc can 502 or similar if down)
+
+`/reload`
+
+Flushes cache and reloads configuration and mapping. Requires reloadToken to be set in the configuration, and a matching token provided in `Authorization: Bearer TOKEN`
+
+`/mirrors`
+
+Shows all mirrors in the legacy (by region) format
+
+`/mirrors.json`
+
+Shows all mirrors in the new JSON format. Example:
+
+```json
+[
+  {
+    "available":true,
+    "host":"imola.armbian.com",
+    "path":"/apt/",
+    "latitude":46.0503,
+    "longitude":14.5046,
+    "weight":10,
+    "continent":"EU",
+    "lastChange":"2022-08-12T06:52:35.029565986Z"
+  }
+]
+```
+
+`/mirrors/{server}.svg`
+
+Magic SVG path to show badges based on server status, for use in dynamic mirror lists.
+
+`/dl_map`
+
+Shows json-encoded download mappings
+
+`/geoip`
+
+Shows GeoIP information for the requester
+
+`/region/REGIONCODE/PATH`
+
+Using this magic path will redirect to the desired region:
+
+* NA - North America
+* EU - Europe
+* AS - Asia
+
+`/metrics`
+
+Prometheus metrics endpoint. Metrics aren't considered private, thus are exposed to the public.

armbianmirror_suite_test.go

@@ -0,0 +1,13 @@
+package redirector
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+func TestArmbianMirror(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "ArmbianMirror Suite")
+}

assets/status-down.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="82" height="20" role="img" aria-label="status: down"><title>status: down</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="82" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="43" height="20" fill="#555"/><rect x="43" width="39" height="20" fill="#e05d44"/><rect width="82" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="225" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="330">status</text><text x="225" y="140" transform="scale(.1)" fill="#fff" textLength="330">status</text><text aria-hidden="true" x="615" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="290">down</text><text x="615" y="140" transform="scale(.1)" fill="#fff" textLength="290">down</text></g></svg>

assets/status-unknown.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="104" height="20" role="img" aria-label="status: unknown"><title>status: unknown</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="104" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="43" height="20" fill="#555"/><rect x="43" width="61" height="20" fill="#9f9f9f"/><rect width="104" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="225" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="330">status</text><text x="225" y="140" transform="scale(.1)" fill="#fff" textLength="330">status</text><text aria-hidden="true" x="725" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="510">unknown</text><text x="725" y="140" transform="scale(.1)" fill="#fff" textLength="510">unknown</text></g></svg>

assets/status-up.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="66" height="20" role="img" aria-label="status: up"><title>status: up</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="66" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="43" height="20" fill="#555"/><rect x="43" width="23" height="20" fill="#4c1"/><rect width="66" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="225" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="330">status</text><text x="225" y="140" transform="scale(.1)" fill="#fff" textLength="330">status</text><text aria-hidden="true" x="535" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="130">up</text><text x="535" y="140" transform="scale(.1)" fill="#fff" textLength="130">up</text></g></svg>

check.go

@@ -0,0 +1,207 @@
+package redirector
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"net"
+	"net/http"
+	"net/url"
+	"runtime"
+	"strings"
+	"time"
+)
+
+var (
+	ErrHttpsRedirect = errors.New("unexpected forced https redirect")
+	ErrHttpRedirect  = errors.New("unexpected redirect to insecure url")
+	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 (r *Redirector) checkHttpScheme(server *Server, scheme string, logFields log.Fields) (bool, error) {
+	u := &url.URL{
+		Scheme: scheme,
+		Host:   server.Host,
+		Path:   server.Path,
+	}
+
+	req, err := http.NewRequest(http.MethodGet, u.String(), nil)
+
+	req.Header.Set("User-Agent", "ArmbianRouter/1.0 (Go "+runtime.Version()+")")
+
+	if err != nil {
+		return false, err
+	}
+
+	res, err := r.config.checkClient.Do(req)
+
+	if err != nil {
+		return false, err
+	}
+
+	logFields["responseCode"] = res.StatusCode
+
+	if res.StatusCode == http.StatusOK || res.StatusCode == http.StatusMovedPermanently || res.StatusCode == http.StatusFound || res.StatusCode == http.StatusNotFound {
+		if res.StatusCode == http.StatusMovedPermanently || res.StatusCode == http.StatusFound {
+			location := res.Header.Get("Location")
+
+			logFields["url"] = location
+
+			switch u.Scheme {
+			case "http":
+				res, err := r.checkRedirect(u.Scheme, location)
+
+				if !res || err != nil {
+					// 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)
+			}
+		}
+
+		return true, nil
+	}
+
+	logFields["cause"] = fmt.Sprintf("Unexpected http status %d", res.StatusCode)
+
+	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 (r *Redirector) checkRedirect(originatingScheme, locationHeader string) (bool, error) {
+	newUrl, err := url.Parse(locationHeader)
+
+	if err != nil {
+		return false, err
+	}
+
+	if newUrl.Scheme == "https" {
+		return false, ErrHttpsRedirect
+	} else if originatingScheme == "https" && newUrl.Scheme == "http" {
+		return false, ErrHttpRedirect
+	}
+
+	return true, nil
+}
+
+// checkTLS checks tls certificates from a host, ensures they're valid, and not expired.
+func (r *Redirector) checkTLS(server *Server, logFields log.Fields) (bool, error) {
+	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, &tls.Config{
+		RootCAs: r.config.RootCAs,
+	})
+
+	if err != nil {
+		return false, err
+	}
+
+	defer conn.Close()
+
+	err = conn.VerifyHostname(server.Host)
+
+	if err != nil {
+		return false, err
+	}
+
+	now := time.Now()
+
+	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(),
+	}
+
+	// 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 {
+			if now.Before(cert.NotBefore) || now.After(cert.NotAfter) {
+				logFields["cert"] = cert.Subject.String()
+				return false, ErrCertExpired
+			}
+		}
+	}
+
+	// If https is valid, append it
+	if !server.Protocols.Contains("https") {
+		server.Protocols = server.Protocols.Append("https")
+	}
+
+	return true, nil
+}

check_test.go

@@ -0,0 +1,197 @@
+package redirector
+
+import (
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/tls"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"fmt"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	log "github.com/sirupsen/logrus"
+	"math/big"
+	"net"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"strings"
+	"time"
+)
+
+func genTestCerts(notBefore, notAfter time.Time) (*pem.Block, *pem.Block, error) {
+	// Create a Certificate Authority Cert
+	template := x509.Certificate{
+		SerialNumber:          big.NewInt(0),
+		Subject:               pkix.Name{CommonName: "localhost"},
+		SignatureAlgorithm:    x509.SHA256WithRSA,
+		NotBefore:             notBefore,
+		NotAfter:              notAfter,
+		BasicConstraintsValid: true,
+		IPAddresses:           []net.IP{net.ParseIP("127.0.0.1")},
+		KeyUsage:              x509.KeyUsageDigitalSignature | x509.KeyUsageKeyAgreement | x509.KeyUsageKeyEncipherment | x509.KeyUsageDataEncipherment,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
+	}
+
+	// Create a Private Key
+	key, err := rsa.GenerateKey(rand.Reader, 4096)
+	if err != nil {
+		return nil, nil, fmt.Errorf("Could not generate rsa key - %s", err)
+	}
+
+	// Use CA Cert to sign a CSR and create a Public Cert
+	csr := &key.PublicKey
+	cert, err := x509.CreateCertificate(rand.Reader, &template, &template, csr, key)
+	if err != nil {
+		return nil, nil, fmt.Errorf("Could not generate certificate - %s", err)
+	}
+
+	// Convert keys into pem.Block
+	c := &pem.Block{Type: "CERTIFICATE", Bytes: cert}
+	k := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
+	return c, k, nil
+}
+
+var _ = Describe("Check suite", func() {
+	var (
+		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{})
+		r.config.SetRootCAs(x509.NewCertPool())
+	})
+	AfterEach(func() {
+		httpServer.Close()
+	})
+	setupServer := func() {
+		u, err := url.Parse(httpServer.URL)
+
+		if err != nil {
+			panic(err)
+		}
+		server = &Server{
+			Host: u.Host,
+			Path: u.Path,
+		}
+	}
+
+	Context("HTTP Checks", func() {
+		BeforeEach(func() {
+			httpServer.Start()
+			setupServer()
+		})
+		It("Should successfully check for connectivity", func() {
+			handler = func(w http.ResponseWriter, r *http.Request) {
+				w.WriteHeader(http.StatusOK)
+			}
+
+			res, err := r.checkHttpScheme(server, "http", log.Fields{})
+
+			Expect(res).To(BeTrue())
+			Expect(err).To(BeNil())
+		})
+	})
+	Context("TLS Checks", func() {
+		var (
+			x509Cert *x509.Certificate
+		)
+		setupCerts := func(notBefore, notAfter time.Time) {
+			cert, key, err := genTestCerts(notBefore, notAfter)
+
+			if err != nil {
+				panic("Unable to generate test certs")
+			}
+
+			x509Cert, err = x509.ParseCertificate(cert.Bytes)
+
+			if err != nil {
+				panic("Unable to parse certificate from bytes: " + err.Error())
+			}
+
+			tlsPair, err := tls.X509KeyPair(pem.EncodeToMemory(cert), pem.EncodeToMemory(key))
+
+			if err != nil {
+				panic("Unable to load tls key pair: " + err.Error())
+			}
+
+			httpServer.TLS = &tls.Config{
+				Certificates: []tls.Certificate{tlsPair},
+			}
+
+			pool := x509.NewCertPool()
+
+			pool.AddCert(x509Cert)
+
+			r.config.SetRootCAs(pool)
+
+			httpServer.StartTLS()
+			setupServer()
+		}
+		Context("HTTPS Checks", func() {
+			BeforeEach(func() {
+				setupCerts(time.Now(), time.Now().Add(24*time.Hour))
+			})
+			It("Should return an error when redirected to http from https", func() {
+				handler = func(w http.ResponseWriter, r *http.Request) {
+					w.Header().Set("Location", strings.Replace(httpServer.URL, "https://", "http://", -1))
+					w.WriteHeader(http.StatusMovedPermanently)
+				}
+
+				logFields := log.Fields{}
+
+				res, err := r.checkHttpScheme(server, "https", logFields)
+
+				Expect(logFields["url"]).ToNot(BeEmpty())
+				Expect(logFields["url"]).ToNot(Equal(httpServer.URL))
+				Expect(err).To(Equal(ErrHttpRedirect))
+				Expect(res).To(BeFalse())
+			})
+		})
+		Context("CA Tests", func() {
+			BeforeEach(func() {
+				setupCerts(time.Now(), time.Now().Add(24*time.Hour))
+			})
+			It("Should fail due to invalid ca", func() {
+				r.config.SetRootCAs(x509.NewCertPool())
+
+				res, err := r.checkTLS(server, log.Fields{})
+
+				Expect(res).To(BeFalse())
+				Expect(err).ToNot(BeNil())
+			})
+			It("Should successfully validate certificates (valid ca, valid date/times, etc)", func() {
+				res, err := r.checkTLS(server, log.Fields{})
+
+				Expect(res).To(BeFalse())
+				Expect(err).ToNot(BeNil())
+			})
+		})
+		Context("Expiration tests", func() {
+			It("Should fail due to not yet valid certificate", func() {
+				setupCerts(time.Now().Add(5*time.Hour), time.Now().Add(10*time.Hour))
+
+				// Check TLS
+				res, err := r.checkTLS(server, log.Fields{})
+
+				Expect(res).To(BeFalse())
+				Expect(err).ToNot(BeNil())
+			})
+			It("Should fail due to expired certificate", func() {
+				setupCerts(time.Now().Add(-10*time.Hour), time.Now().Add(-5*time.Hour))
+
+				// Check TLS
+				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

@@ -0,0 +1,332 @@
+package redirector
+
+import (
+	"crypto/tls"
+	"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"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+)
+
+type Config struct {
+	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
+	checkClient *http.Client
+}
+
+// SetRootCAs sets the root ca files, and creates the http client for checks
+// This **MUST** be called before r.checkClient is used.
+func (c *Config) SetRootCAs(cas *x509.CertPool) {
+	c.RootCAs = cas
+
+	t := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			RootCAs: cas,
+		},
+	}
+
+	c.checkClient = &http.Client{
+		Transport: t,
+		Timeout:   20 * time.Second,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+}
+
+type ProtocolList []string
+
+func (p ProtocolList) Contains(value string) bool {
+	for _, val := range p {
+		if value == val {
+			return true
+		}
+	}
+
+	return false
+}
+
+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
+	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 r.serverCache == nil {
+		r.serverCache, err = lru.New(r.config.CacheSize)
+	} else {
+		r.serverCache.Resize(r.config.CacheSize)
+	}
+
+	// Purge the cache to ensure we don't have any invalid servers in it
+	r.serverCache.Purge()
+
+	// Reload map file
+	if err := r.reloadMap(); err != nil {
+		return errors.Wrap(err, "Unable to load map file")
+	}
+
+	// Reload server list
+	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 r.servers {
+		mirrors[server.Continent] = append(mirrors[server.Continent], server)
+	}
+
+	mirrors["default"] = append(mirrors["NA"], mirrors["EU"]...)
+
+	r.regionMap = mirrors
+
+	hosts := make(map[string]*Server)
+
+	for _, server := range r.servers {
+		hosts[server.Host] = server
+	}
+
+	r.hostMap = hosts
+
+	// Check top choices size
+	if r.config.TopChoices > len(r.servers) {
+		r.config.TopChoices = len(r.servers)
+	}
+
+	// Force check
+	go r.servers.Check(r.checks)
+
+	return nil
+}
+
+func (r *Redirector) reloadServers() error {
+	log.WithField("count", len(r.config.ServerList)).Info("Loading servers")
+	var wg sync.WaitGroup
+
+	existing := make(map[string]int)
+
+	for i, server := range r.servers {
+		existing[server.Host] = i
+	}
+
+	hosts := make(map[string]bool)
+
+	var hostsLock sync.Mutex
+
+	for _, server := range r.config.ServerList {
+		wg.Add(1)
+
+		var prefix string
+
+		if !strings.HasPrefix(server.Server, "http") {
+			prefix = "https://"
+		}
+
+		u, err := url.Parse(prefix + server.Server)
+
+		if err != nil {
+			log.WithFields(log.Fields{
+				"error":  err,
+				"server": server,
+			}).Warning("Server is invalid")
+			return err
+		}
+
+		i := -1
+
+		if v, exists := existing[u.Host]; exists {
+			i = v
+		}
+
+		go func(i int, server ServerConfig, u *url.URL) {
+			defer wg.Done()
+
+			s, err := r.addServer(server, u)
+
+			if err != nil {
+				log.WithError(err).Warning("Unable to add server")
+				return
+			}
+
+			hostsLock.Lock()
+			hosts[u.Host] = true
+			hostsLock.Unlock()
+
+			if _, ok := existing[u.Host]; ok {
+				s.Redirects = r.servers[i].Redirects
+
+				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,
+				})
+
+				r.servers = append(r.servers, s)
+
+				log.WithFields(log.Fields{
+					"server":    u.Host,
+					"path":      u.Path,
+					"latitude":  s.Latitude,
+					"longitude": s.Longitude,
+				}).Info("Added server")
+			}
+		}(i, server, u)
+	}
+
+	wg.Wait()
+
+	// Remove servers that no longer exist in the config
+	for i := len(r.servers) - 1; i >= 0; i-- {
+		if _, exists := hosts[r.servers[i].Host]; exists {
+			continue
+		}
+
+		log.WithFields(log.Fields{
+			"server": r.servers[i].Host,
+		}).Info("Removed server")
+
+		r.servers = append(r.servers[:i], r.servers[i+1:]...)
+	}
+
+	return nil
+}
+
+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 (r *Redirector) addServer(server ServerConfig, u *url.URL) (*Server, error) {
+	s := &Server{
+		Available: true,
+		Host:      u.Host,
+		Path:      u.Path,
+		Latitude:  server.Latitude,
+		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
+	if s.Weight == 0 {
+		s.Weight = 10
+	}
+
+	ips, err := net.LookupIP(u.Host)
+
+	if err != nil {
+		log.WithFields(log.Fields{
+			"error":  err,
+			"server": s.Host,
+		}).Warning("Could not resolve address")
+		return nil, err
+	}
+
+	var city City
+	err = r.db.Lookup(ips[0], &city)
+
+	if err != nil {
+		log.WithFields(log.Fields{
+			"error":  err,
+			"server": s.Host,
+			"ip":     ips[0],
+		}).Warning("Could not geolocate address")
+		return nil, err
+	}
+
+	if s.Continent == "" {
+		s.Continent = city.Continent.Code
+	}
+
+	if s.Latitude == 0 && s.Longitude == 0 {
+		s.Latitude = city.Location.Latitude
+		s.Longitude = city.Location.Longitude
+	}
+
+	return s, nil
+}
+
+func (r *Redirector) reloadMap() error {
+	mapFile := r.config.MapFile
+
+	if mapFile == "" {
+		return nil
+	}
+
+	log.WithField("file", mapFile).Info("Loading download map")
+
+	newMap, err := loadMapFile(mapFile)
+
+	if err != nil {
+		return err
+	}
+
+	r.dlMap = newMap
+
+	return nil
+}

dlrouter.yaml

@@ -1,12 +1,51 @@
-geodb: GeoIP2-City.mmdb
+# GeoIP Database Path
+geodb: GeoLite2-City.mmdb
 dl_map: userdata.csv
 
+# LRU Cache Size (in items)
+cacheSize: 1024
+
+# Server definition
+# Weights are just like nginx, where if it's > 1 it'll be chosen x out of x + total times
+# By default, the top 3 servers are used for choosing the best.
+# server = full url or host+path
+# weight = int
+# optional: latitude, longitude (float)
 servers:
-    - mirrors.tuna.tsinghua.edu.cn/armbian/
+    - server: armbian.12z.eu/apt/
-    - armbian.tnahosting.net/apt/
+    - server: armbian.chi.auroradev.org/apt/
-    - us.mirrors.fossho.st/armbian/armbian/
+      weight: 15
-    - uk.mirrors.fossho.st/armbian/apt/
+      latitude: 41.8879
-    - armbian.systemonachip.net/apt/
+      longitude: -88.1995
-    - mirrors.netix.net/armbian/apt/
+    - server: armbian.hosthatch.com/apt/
-    - mirrors.dotsrc.org/armbian-apt/
+    - server: armbian.lv.auroradev.org/apt/
-    - armbian.lv.auroradev.org/apt/
+      weight: 15
+    - server: armbian.site-meganet.com/apt/
+    - server: armbian.systemonachip.net/apt/
+    - server: armbian.tnahosting.net/apt/
+      weight: 15
+    - server: au-mirror.bret.dk/armbian/apt/
+    - server: es-mirror.bret.dk/armbian/apt/
+    - server: imola.armbian.com/apt/
+    - server: mirror.iscas.ac.cn/armbian/
+    - server: mirror.sjtu.edu.cn/armbian/
+    - server: mirrors.aliyun.com/armbian/
+      continent: AS
+    - 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/
+    - server: mirrors.tuna.tsinghua.edu.cn/armbian/
+    - server: mirrors.ustc.edu.cn/armbian/
+    - server: mirrors.xtom.de/armbian/
+    - server: sg-mirror.bret.dk/armbian/apt/
+    - server: stpete-mirror.armbian.com/apt/
+    - server: xogium.performanceservers.nl/apt/
+    - server: github.com/armbian/mirror/releases/download/
+      continent: GITHUB

go.mod

@@ -1,26 +1,46 @@
-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
+	github.com/onsi/gomega v1.20.0
 	github.com/oschwald/maxminddb-golang v1.8.0
+	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.11.0
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/viper v1.10.1
 )
 
 require (
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.8 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/magiconair/properties v1.8.5 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/mitchellh/mapstructure v1.4.3 // indirect
 	github.com/pelletier/go-toml v1.9.4 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
 	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/subosito/gotenv v1.2.0 // indirect
-	golang.org/x/sys v0.0.0-20211210111614-af8b64212486 // indirect
+	golang.org/x/net v0.0.0-20220425223048-2871e0cb64e4 // indirect
+	golang.org/x/sys v0.0.0-20220422013727-9388b58f7150 // indirect
 	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,25 +1,370 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
+cloud.google.com/go v0.99.0/go.mod h1:w0Xx2nLzqWJPuozYQX+hFfCSI8WioryfRDzkoI/Y2ZA=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
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http.go

@@ -1,29 +1,31 @@
-package main
+package redirector
 
 import (
 	"encoding/json"
 	"fmt"
-	log "github.com/sirupsen/logrus"
+	"github.com/jmcvetta/randutil"
-	"github.com/spf13/viper"
 	"net"
 	"net/http"
 	"net/url"
+	"os"
 	"path"
 	"strings"
 )
 
-func statusHandler(w http.ResponseWriter, r *http.Request) {
+// statusHandler is a simple handler that will always return 200 OK with a body of "OK"
+func (r *Redirector) statusHandler(w http.ResponseWriter, req *http.Request) {
 	w.WriteHeader(http.StatusOK)
+
+	if req.Method != http.MethodHead {
+		w.Write([]byte("OK"))
+	}
 }
 
-func mirrorsHandler(w http.ResponseWriter, r *http.Request) {
+// redirectHandler is the default "not found" handler which handles redirects
-	w.Header().Set("Content-Type", "application/json")
+// 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
-	json.NewEncoder(w).Encode(servers)
+func (r *Redirector) redirectHandler(w http.ResponseWriter, req *http.Request) {
-}
+	ipStr, _, err := net.SplitHostPort(req.RemoteAddr)
-
-func redirectHandler(w http.ResponseWriter, r *http.Request) {
-	ipStr, _, err := net.SplitHostPort(r.RemoteAddr)
 
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
@@ -32,69 +34,166 @@ func redirectHandler(w http.ResponseWriter, r *http.Request) {
 
 	ip := net.ParseIP(ipStr)
 
-	// TODO: This is temporary to allow testing on private addresses.
+	if ip.IsLoopback() || ip.IsPrivate() {
-	if ip.IsPrivate() {
+		overrideIP := os.Getenv("OVERRIDE_IP")
-		ip = net.ParseIP("1.1.1.1")
+
+		if overrideIP == "" {
+			overrideIP = "1.1.1.1"
+		}
+
+		ip = net.ParseIP(overrideIP)
 	}
 
-	server, distance, err := servers.Closest(ip)
+	var server *Server
+	var distance float64
 
-	if err != nil {
+	// If the path has a prefix of region/NA, it will use specific regions instead
-		http.Error(w, err.Error(), http.StatusInternalServerError)
+	// of the default geographical distance
-		return
+	if strings.HasPrefix(req.URL.Path, "/region") {
+		parts := strings.Split(req.URL.Path, "/")
+
+		// region = parts[2]
+		if mirrors, ok := r.regionMap[parts[2]]; ok {
+			choices := make([]randutil.Choice, len(mirrors))
+
+			for i, item := range mirrors {
+				if !item.Available {
+					continue
+				}
+
+				choices[i] = randutil.Choice{
+					Weight: item.Weight,
+					Item:   item,
+				}
+			}
+
+			choice, err := randutil.WeightedChoice(choices)
+
+			if err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			server = choice.Item.(*Server)
+
+			req.URL.Path = strings.Join(parts[3:], "/")
+		}
 	}
 
-	scheme := r.URL.Scheme
+	// If we don't have a scheme, we'll use http by default
+	scheme := req.URL.Scheme
 
 	if scheme == "" {
-		scheme = "https"
+		scheme = "http"
 	}
 
-	redirectPath := path.Join(server.Path, r.URL.Path)
+	// If none of the above exceptions are matched, we use the geographical distance based on IP
+	if server == nil {
+		server, distance, err = r.servers.Closest(r, scheme, ip)
 
-	if dlMap != nil {
+		if err != nil {
-		if newPath, exists := dlMap[strings.TrimLeft(r.URL.Path, "/")]; exists {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	}
+
+	// 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, req.URL.Path)
+
+	// If we have a dlMap, we map the url to a final path instead
+	if r.dlMap != nil {
+		if newPath, exists := r.dlMap[strings.TrimLeft(req.URL.Path, "/")]; exists {
+			downloadsMapped.Inc()
 			redirectPath = path.Join(server.Path, newPath)
 		}
 	}
 
+	if strings.HasSuffix(req.URL.Path, "/") && !strings.HasSuffix(redirectPath, "/") {
+		redirectPath += "/"
+	}
+
+	// We need to build the final url now
 	u := &url.URL{
 		Scheme: scheme,
 		Host:   server.Host,
 		Path:   redirectPath,
 	}
 
-	w.Header().Set("X-Geo-Distance", fmt.Sprintf("%f", distance))
+	server.Redirects.Inc()
+	redirectsServed.Inc()
+
+	// If we used geographical distance, we add an X-Geo-Distance header for debug.
+	if distance > 0 {
+		w.Header().Set("X-Geo-Distance", fmt.Sprintf("%f", distance))
+	}
+
 	w.Header().Set("Location", u.String())
 	w.WriteHeader(http.StatusFound)
 }
 
-func reloadHandler(w http.ResponseWriter, r *http.Request) {
+// reloadHandler is an http handler which lets us reload the server configuration
-	if mapFile := viper.GetString("dl_map"); mapFile != "" {
+// It is only enabled when the reloadToken is set in the configuration
-		log.WithField("file", mapFile).Info("Loading download map")
+func (r *Redirector) reloadHandler(w http.ResponseWriter, req *http.Request) {
-
+	if r.config.ReloadToken == "" {
-		newMap, err := loadMap(mapFile)
+		w.WriteHeader(http.StatusUnauthorized)
-
-		if err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
-		}
-
-		dlMap = newMap
-
 		return
 	}
 
-	w.WriteHeader(http.StatusNotFound)
+	token := req.Header.Get("Authorization")
+
+	if token == "" || !strings.HasPrefix(token, "Bearer") || !strings.Contains(token, " ") {
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	token = token[strings.Index(token, " ")+1:]
+
+	if token != r.config.ReloadToken {
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	if err := r.ReloadConfig(); err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte(err.Error()))
+		return
+	}
+
+	w.WriteHeader(http.StatusOK)
+	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 (r *Redirector) geoIPHandler(w http.ResponseWriter, req *http.Request) {
+	ipStr, _, err := net.SplitHostPort(req.RemoteAddr)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	ip := net.ParseIP(ipStr)
+
+	var city City
+	err = r.db.Lookup(ip, &city)
+
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	json.NewEncoder(w).Encode(city)
 }

main.go

@@ -1,131 +0,0 @@
-package main
-
-import (
-	"github.com/oschwald/maxminddb-golang"
-	log "github.com/sirupsen/logrus"
-	"github.com/spf13/viper"
-	"net"
-	"net/http"
-	"net/url"
-	"strings"
-)
-
-var (
-	db      *maxminddb.Reader
-	servers ServerList
-
-	dlMap map[string]string
-)
-
-// City represents a MaxmindDB city
-type City struct {
-	Location struct {
-		Latitude  float64 `maxminddb:"latitude"`
-		Longitude float64 `maxminddb:"longitude"`
-	} `maxminddb:"location"`
-}
-
-func main() {
-	viper.SetDefault("bind", ":8080")
-
-	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
-	err := viper.ReadInConfig()            // Find and read the config file
-
-	if err != nil { // Handle errors reading the config file
-		log.WithError(err).Fatalln("Unable to load config file")
-	}
-
-	db, err = maxminddb.Open(viper.GetString("geodb"))
-
-	if err != nil {
-		log.WithError(err).Fatalln("Unable to open database")
-	}
-
-	if mapFile := viper.GetString("dl_map"); mapFile != "" {
-		log.WithField("file", mapFile).Info("Loading download map")
-
-		dlMap, err = loadMap(mapFile)
-
-		if err != nil {
-			log.WithError(err).Fatalln("Unable to load download map")
-		}
-	}
-
-	serverList := viper.GetStringSlice("servers")
-
-	for _, server := range serverList {
-		var prefix string
-
-		if !strings.HasPrefix(server, "http") {
-			prefix = "https://"
-		}
-
-		u, err := url.Parse(prefix + server)
-
-		if err != nil {
-			log.WithFields(log.Fields{
-				"error":  err,
-				"server": server,
-			}).Warning("Server is invalid")
-			continue
-		}
-
-		ips, err := net.LookupIP(u.Host)
-
-		if err != nil {
-			log.WithFields(log.Fields{
-				"error":  err,
-				"server": server,
-			}).Warning("Could not resolve address")
-			continue
-		}
-
-		var city City
-		err = db.Lookup(ips[0], &city)
-
-		if err != nil {
-			log.WithFields(log.Fields{
-				"error":  err,
-				"server": server,
-			}).Warning("Could not geolocate address")
-			continue
-		}
-
-		servers = append(servers, &Server{
-			Host:      u.Host,
-			Path:      u.Path,
-			Latitude:  city.Location.Latitude,
-			Longitude: city.Location.Longitude,
-		})
-
-		log.WithFields(log.Fields{
-			"server":    u.Host,
-			"path":      u.Path,
-			"latitude":  city.Location.Latitude,
-			"longitude": city.Location.Longitude,
-		}).Info("Added server")
-	}
-
-	log.Info("Servers added, checking statuses")
-	// Force initial check before running
-	servers.Check()
-
-	// Start check loop
-	go servers.checkLoop()
-
-	log.Info("Starting")
-
-	mux := http.NewServeMux()
-
-	mux.HandleFunc("/status", statusHandler)
-	mux.HandleFunc("/mirrors", mirrorsHandler)
-	mux.HandleFunc("/reload", reloadHandler)
-	mux.HandleFunc("/dl_map", dlMapHandler)
-	mux.HandleFunc("/", RealIPMiddleware(redirectHandler))
-
-	http.ListenAndServe(viper.GetString("bind"), mux)
-}

map.go

@@ -1,4 +1,4 @@
-package main
+package redirector
 
 import (
 	"encoding/csv"
@@ -7,7 +7,8 @@ import (
 	"strings"
 )
 
-func loadMap(file string) (map[string]string, error) {
+// loadMapFile loads a file as a map
+func loadMapFile(file string) (map[string]string, error) {
 	f, err := os.Open(file)
 
 	if err != nil {
@@ -16,10 +17,17 @@ func loadMap(file string) (map[string]string, error) {
 
 	defer f.Close()
 
+	return loadMap(f)
+}
+
+// loadMap loads a pipe separated file of mappings
+func loadMap(f io.Reader) (map[string]string, error) {
 	m := make(map[string]string)
 
 	r := csv.NewReader(f)
 
+	r.Comma = '|'
+
 	for {
 		row, err := r.Read()
 

map_test.go

@@ -0,0 +1,16 @@
+package redirector
+
+import (
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+	"strings"
+)
+
+var _ = Describe("Map", func() {
+	It("Should successfully load the map", func() {
+		m, err := loadMap(strings.NewReader(`bananapi/Bullseye_current|bananapi/archive/Armbian_21.08.1_Bananapi_bullseye_current_5.10.60.img.xz|Aug 26 2021|332M`))
+
+		Expect(err).To(BeNil())
+		Expect(m["bananapi/Bullseye_current"]).To(Equal("bananapi/archive/Armbian_21.08.1_Bananapi_bullseye_current_5.10.60.img.xz"))
+	})
+})

middleware/middleware.go

@@ -1,4 +1,4 @@
-package main
+package middleware
 
 import (
 	"net"
@@ -15,8 +15,8 @@ var (
 
 // RealIPMiddleware is an implementation of reverse proxy checks.
 // It uses the remote address to find the originating IP, as well as protocol
-func RealIPMiddleware(f http.HandlerFunc) http.HandlerFunc {
+func RealIPMiddleware(f http.Handler) http.Handler {
-	return func(w http.ResponseWriter, r *http.Request) {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		// Treat unix socket as 127.0.0.1
 		if r.RemoteAddr == "@" {
 			r.RemoteAddr = "127.0.0.1:0"
@@ -29,7 +29,9 @@ func RealIPMiddleware(f http.HandlerFunc) http.HandlerFunc {
 			return
 		}
 
-		if net.ParseIP(host).IsPrivate() {
+		netIP := net.ParseIP(host)
+
+		if !netIP.IsLoopback() && !netIP.IsPrivate() {
 			f.ServeHTTP(w, r)
 			return
 		}
@@ -43,7 +45,7 @@ func RealIPMiddleware(f http.HandlerFunc) http.HandlerFunc {
 		}
 
 		f.ServeHTTP(w, r)
-	}
+	})
 }
 
 func realIP(r *http.Request) string {

mirrors.go

@@ -0,0 +1,94 @@
+package redirector
+
+import (
+	_ "embed"
+	"encoding/json"
+	"github.com/go-chi/chi/v5"
+	"net/http"
+	"strconv"
+	"strings"
+)
+
+// 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 (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 r.regionMap {
+		list := make([]string, len(mirrors))
+
+		for i, mirror := range mirrors {
+			list[i] = req.URL.Scheme + "://" + mirror.Host + "/" + strings.TrimLeft(mirror.Path, "/")
+		}
+
+		mirrorOutput[region] = list
+	}
+
+	json.NewEncoder(w).Encode(mirrorOutput)
+}
+
+// mirrorsHandler is a simple handler that will return the list of servers
+func (r *Redirector) mirrorsHandler(w http.ResponseWriter, req *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(r.servers)
+}
+
+var (
+	//go:embed assets/status-up.svg
+	statusUp []byte
+
+	//go:embed assets/status-down.svg
+	statusDown []byte
+
+	//go:embed assets/status-unknown.svg
+	statusUnknown []byte
+)
+
+// mirrorStatusHandler is a fancy svg-returning handler.
+// it is used to display mirror statuses on a config repo of sorts
+func (r *Redirector) mirrorStatusHandler(w http.ResponseWriter, req *http.Request) {
+	serverHost := chi.URLParam(req, "server")
+
+	w.Header().Set("Content-Type", "image/svg+xml;charset=utf-8")
+	w.Header().Set("Cache-Control", "max-age=120")
+
+	if serverHost == "" {
+		w.Write(statusUnknown)
+		return
+	}
+
+	serverHost = strings.Replace(serverHost, "_", ".", -1)
+
+	server, ok := r.hostMap[serverHost]
+
+	if !ok {
+		w.Header().Set("Content-Length", strconv.Itoa(len(statusUnknown)))
+		w.Write(statusUnknown)
+		return
+	}
+
+	key := "offline"
+
+	if server.Available {
+		key = "online"
+	}
+
+	w.Header().Set("ETag", "\""+key+"\"")
+
+	if match := req.Header.Get("If-None-Match"); match != "" {
+		if strings.Trim(match, "\"") == key {
+			w.WriteHeader(http.StatusNotModified)
+			return
+		}
+	}
+
+	if server.Available {
+		w.Header().Set("Content-Length", strconv.Itoa(len(statusUp)))
+		w.Write(statusUp)
+	} else {
+		w.Header().Set("Content-Length", strconv.Itoa(len(statusDown)))
+		w.Write(statusDown)
+	}
+}

redirector.go

@@ -0,0 +1,131 @@
+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
+	checkClient *http.Client
+}
+
+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

@@ -1,114 +1,186 @@
-package main
+package redirector
 
 import (
+	"github.com/jmcvetta/randutil"
+	"github.com/prometheus/client_golang/prometheus"
 	log "github.com/sirupsen/logrus"
 	"math"
 	"net"
-	"net/http"
+	"sort"
-	"runtime"
-	"strings"
 	"sync"
 	"time"
 )
 
-var (
+// Server represents a download server
-	checkClient = &http.Client{
-		Timeout: 10 * time.Second,
-	}
-)
-
 type Server struct {
-	Available bool
+	Available  bool               `json:"available"`
-	Host      string
+	Host       string             `json:"host"`
-	Path      string
+	Path       string             `json:"path"`
-	Latitude  float64
+	Latitude   float64            `json:"latitude"`
-	Longitude float64
+	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)
+
+// checkStatus runs all status checks against a server
+func (server *Server) checkStatus(checks []ServerCheck) {
+	logFields := log.Fields{
+		"host": server.Host,
+	}
+
+	var res bool
+	var err error
+
+	for _, check := range checks {
+		res, err = check(server, logFields)
+
+		if err != nil {
+			logFields["error"] = err
+		}
+
+		if !res {
+			break
+		}
+	}
+
+	if !res {
+		if server.Available {
+			log.WithFields(logFields).Info("Server went offline")
+
+			server.Available = false
+			server.LastChange = time.Now()
+		} else {
+			log.WithFields(logFields).Debug("Server is still offline")
+		}
+
+		return
+	} else {
+		if !server.Available {
+			server.Available = true
+			server.LastChange = time.Now()
+			log.WithFields(logFields).Info("Server is online")
+		}
+	}
 }
 
 type ServerList []*Server
 
-func (s ServerList) checkLoop() {
+func (s ServerList) checkLoop(checks []ServerCheck) {
 	t := time.NewTicker(60 * time.Second)
 
 	for {
 		<-t.C
-
+		s.Check(checks)
-		s.Check()
 	}
 }
 
 // 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 {
 		wg.Add(1)
 
 		go func(server *Server) {
-			req, err := http.NewRequest(http.MethodGet, "https://"+server.Host+"/"+strings.TrimLeft(server.Path, "/"), nil)
+			defer wg.Done()
 
-			req.Header.Set("User-Agent", "ArmbianRouter/1.0 (Go "+runtime.Version()+")")
+			server.checkStatus(checks)
-
-			if err != nil {
-				// This should never happen.
-				log.WithError(err).Warning("Invalid request! This should not happen, please check config.")
-				wg.Done()
-				return
-			}
-
-			res, err := checkClient.Do(req)
-
-			if err != nil {
-				if server.Available {
-					log.WithField("server", server.Host).Info("Server went offline")
-					server.Available = false
-				}
-				wg.Done()
-				return
-			}
-
-			if (res.StatusCode == http.StatusOK || res.StatusCode == http.StatusMovedPermanently || res.StatusCode == http.StatusFound) &&
-				!server.Available {
-				server.Available = true
-				log.WithField("server", server.Host).Info("Server is online")
-			}
-
-			wg.Done()
 		}(server)
 	}
 
 	wg.Wait()
 }
 
-// Closest will use GeoIP on the IP provided and find the closest server.
+// ComputedDistance is a wrapper that contains a Server and Distance.
+type ComputedDistance struct {
+	Server   *Server
+	Distance float64
+}
+
+// DistanceList is a list of Computed Distances with an easy "Choices" func
+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) {
-	var city City
+	choiceInterface, exists := r.serverCache.Get(scheme + "_" + ip.String())
-	err := db.Lookup(ip, &city)
+
+	if !exists {
+		var city LocationLookup
+		err := r.db.Lookup(ip, &city)
+
+		if err != nil {
+			return nil, -1, err
+		}
+
+		c := make(DistanceList, len(s))
+
+		for i, server := range s {
+			if !server.Available || !server.Protocols.Contains(scheme) {
+				continue
+			}
+
+			distance := Distance(city.Location.Latitude, city.Location.Longitude, server.Latitude, server.Longitude)
+
+			c[i] = ComputedDistance{
+				Server:   server,
+				Distance: distance,
+			}
+		}
+
+		// Sort by distance
+		sort.Slice(c, func(i int, j int) bool {
+			return c[i].Distance < c[j].Distance
+		})
+
+		choiceCount := r.config.TopChoices
+
+		if len(c) < r.config.TopChoices {
+			choiceCount = len(c)
+		}
+
+		choices := make([]randutil.Choice, choiceCount)
+
+		for i, item := range c[0:choiceCount] {
+			if item.Server == nil {
+				continue
+			}
+
+			choices[i] = randutil.Choice{
+				Weight: item.Server.Weight,
+				Item:   item,
+			}
+		}
+
+		choiceInterface = choices
+
+		r.serverCache.Add(scheme+"_"+ip.String(), choiceInterface)
+	}
+
+	choice, err := randutil.WeightedChoice(choiceInterface.([]randutil.Choice))
 
 	if err != nil {
 		return nil, -1, err
 	}
 
-	var closest *Server
+	dist := choice.Item.(ComputedDistance)
-	var closestDistance float64 = -1
 
-	for _, server := range s {
+	if !dist.Server.Available {
-		if !server.Available {
+		// Choose a new server and refresh cache
-			continue
+		r.serverCache.Remove(scheme + "_" + ip.String())
-		}
 
-		distance := Distance(city.Location.Latitude, city.Location.Longitude, server.Latitude, server.Longitude)
+		return s.Closest(r, scheme, ip)
-
-		if closestDistance == -1 || distance < closestDistance {
-			closestDistance = distance
-			closest = server
-		}
 	}
 
-	return closest, closestDistance, nil
+	return dist.Server, dist.Distance, nil
 }
 
 // haversin(θ) function
@@ -117,9 +189,10 @@ 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 Haversin Distance Formula for
+//	a given longitude and latitude relatively accurately (using a spherical
-//     great arc distance on a sphere with accuracy for small distances
+//	approximation of the Earth) through the Haversine Distance Formula for
+//	great arc distance on a sphere with accuracy for small distances
 //
 // point coordinates are supplied in degrees and converted into rad. in the func
 //

userdata.csv

@@ -1 +0,0 @@
-bananapi/Bullseye_current,bananapi/archive/Armbian_21.08.1_Bananapi_bullseye_current_5.10.60.img.xz

util.go

@@ -0,0 +1,13 @@
+package redirector
+
+import "math/rand"
+
+var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func RandomSequence(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}

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
+}