/
server.go
214 lines (180 loc) · 5.09 KB
/
server.go
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package wellknownips
import (
"fmt"
"net/http"
"os"
"path/filepath"
"sort"
"sync"
"github.com/gregjones/httpcache"
"github.com/gregjones/httpcache/diskcache"
"github.com/rs/zerolog/log"
"golang.org/x/sync/errgroup"
"github.com/pomerium/datasource/internal/jsonutil"
)
var DefaultIP2ASNURL = "https://iptoasn.com/data/ip2asn-v4.tsv.gz"
type serverConfig struct {
ip2asnURL string
}
// A ServerOption customizes the server config.
type ServerOption func(*serverConfig)
// WithIP2ASNURL sets the ip2asn url in the config.
func WithIP2ASNURL(url string) ServerOption {
return func(cfg *serverConfig) {
cfg.ip2asnURL = url
}
}
func getServerConfig(options ...ServerOption) *serverConfig {
cfg := new(serverConfig)
WithIP2ASNURL(DefaultIP2ASNURL)(cfg)
for _, option := range options {
option(cfg)
}
return cfg
}
// Server serves well-known-ip records
type Server struct {
cfg *serverConfig
cacheInit sync.Once
cache httpcache.Cache
cacheErr error
}
// NewServer creates a new Server.
func NewServer(options ...ServerOption) *Server {
cfg := getServerConfig(options...)
return &Server{
cfg: cfg,
}
}
// ServeHTTP implements the http.Handler interface.
func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
err := srv.serveHTTP(w, r)
if err != nil {
log.Error().Err(err).Send()
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
func (srv *Server) serveHTTP(w http.ResponseWriter, r *http.Request) error {
if r.URL.Path != "/" {
http.NotFound(w, r)
return nil
}
cache, err := srv.getCache()
if err != nil {
return fmt.Errorf("error getting cache: %w", err)
}
transport := httpcache.NewTransport(cache)
eg, ctx := errgroup.WithContext(r.Context())
recordLookup := map[string][]Record{}
recordLookup[AmazonASNumber] = nil
eg.Go(func() error {
amazonAWSIPRanges, err := FetchAmazonAWSIPRanges(ctx, transport.Client(), DefaultAmazonAWSIPRangesURL)
if err != nil {
return fmt.Errorf("error fetching amazon aws ip ranges: %w", err)
}
recordLookup[AmazonASNumber] = RecordsFromAmazonAWSIPRanges(amazonAWSIPRanges)
return nil
})
recordLookup[AppleASNumber] = nil
eg.Go(func() error {
recordLookup[AppleASNumber] = RecordsFromAppleDomainVerificationIPAddresses(AppleDomainVerificationIPAddresses)
return nil
})
recordLookup[AtlassianASNumber] = nil
eg.Go(func() error {
atlassianRanges, err := FetchAtlassianIPRanges(ctx, transport.Client(), DefaultAtlassianIPRangesURL)
if err != nil {
return fmt.Errorf("error fetching atlassian ip ranges: %w", err)
}
recordLookup[AtlassianASNumber] = RecordsFromAtlassianIPRanges(atlassianRanges)
return nil
})
recordLookup[MicrosoftASNumber] = nil
eg.Go(func() error {
azureRanges, err := FetchAzureIPRanges(ctx)
if err != nil {
return fmt.Errorf("error fetching azure ip ranges: %w", err)
}
recordLookup[MicrosoftASNumber] = RecordsFromAzureIPRanges(azureRanges)
return err
})
recordLookup[GitHubASNumber] = nil
eg.Go(func() error {
githubMeta, err := FetchGitHubMeta(ctx, transport.Client(), DefaultGitHubMetaURL)
if err != nil {
return fmt.Errorf("error fetching github ip ranges: %w", err)
}
recordLookup[GitHubASNumber] = RecordsFromGitHubMeta(githubMeta)
return err
})
recordLookup[StripeASNumber] = nil
eg.Go(func() error {
stripeRanges, err := FetchStripeIPRanges(ctx, transport.Client(), DefaultStripeIPRangesURL)
if err != nil {
return fmt.Errorf("error fetching stripe ip ranges: %w", err)
}
recordLookup[StripeASNumber] = RecordsFromStripeIPRanges(stripeRanges)
return err
})
err = eg.Wait()
if err != nil {
return fmt.Errorf("error fetching well known ip ranges: %w", err)
}
stream, err := FetchIP2ASNDatabase(r.Context(), transport.Client(), srv.cfg.ip2asnURL)
if err != nil {
return fmt.Errorf("error fetching ip2asn database: %w", err)
}
dst := jsonutil.NewJSONArrayStream(w)
for stream.Next(r.Context()) {
_, ok := recordLookup[stream.Record().ASNumber]
if ok {
// skip well-defined ip ranges
continue
}
for _, record := range RecordsFromIP2ASNRecord(stream.Record()) {
err := dst.Encode(record)
if err != nil {
return fmt.Errorf("failed to write record to destination: %w", err)
}
}
}
var keys []string
for key := range recordLookup {
keys = append(keys, key)
}
sort.Strings(keys)
for _, key := range keys {
for _, record := range recordLookup[key] {
err := dst.Encode(record)
if err != nil {
return fmt.Errorf("failed to write record to destination: %w", err)
}
}
}
err = stream.Err()
if err != nil {
return err
}
err = dst.Close()
if err != nil {
return err
}
return nil
}
func (srv *Server) getCache() (httpcache.Cache, error) {
srv.cacheInit.Do(func() {
userCacheDir, err := os.UserCacheDir()
if err != nil {
srv.cacheErr = fmt.Errorf("failed to get user cache directory: %w", err)
return
}
dir := filepath.Join(userCacheDir, "pomerium-datasource", "wellknownips")
err = os.MkdirAll(dir, 0755)
if err != nil {
srv.cacheErr = fmt.Errorf("failed to create wellknownips directory")
return
}
srv.cache = diskcache.New(dir)
})
return srv.cache, srv.cacheErr
}