159 lines
3.5 KiB
Go
159 lines
3.5 KiB
Go
package main
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import (
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"encoding/csv"
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"fmt"
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"io/ioutil"
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"net/http"
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"os"
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"strings"
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"time"
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"github.com/dchest/safefile"
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"github.com/jedisct1/dlog"
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"github.com/jedisct1/go-minisign"
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)
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type SourceFormat int
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const (
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SourceFormatV1 = iota
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)
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type Source struct {
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url string
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format SourceFormat
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in string
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}
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func fetchFromCache(cacheFile string) ([]byte, error) {
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dlog.Infof("Loading source information from cache file [%s]", cacheFile)
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return ioutil.ReadFile(cacheFile)
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}
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func fetchWithCache(url string, cacheFile string, refreshDelay time.Duration) (in string, cached bool, err error) {
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var bin []byte
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cached, usableCache := false, false
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fi, err := os.Stat(cacheFile)
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if err == nil {
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elapsed := time.Since(fi.ModTime())
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if elapsed < refreshDelay && elapsed >= 0 {
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usableCache = true
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}
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}
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if usableCache {
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bin, err = fetchFromCache(cacheFile)
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if err == nil {
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cached = true
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}
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}
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if !cached {
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var resp *http.Response
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dlog.Infof("Loading source information from URL [%s]", url)
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resp, err = http.Get(url)
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if err != nil {
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if usableCache {
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bin, err = fetchFromCache(cacheFile)
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}
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if err != nil {
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return
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}
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} else {
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bin, err = ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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if err != nil {
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if usableCache {
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bin, err = fetchFromCache(cacheFile)
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}
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if err != nil {
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return
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}
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}
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}
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}
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in = string(bin)
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return
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}
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func AtomicFileWrite(file string, data []byte) error {
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return safefile.WriteFile(file, data, 0644)
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}
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func NewSource(url string, minisignKeyStr string, cacheFile string, formatStr string, refreshDelay time.Duration) (Source, error) {
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source := Source{url: url}
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if formatStr != "v1" {
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return source, fmt.Errorf("Unsupported source format: [%s]", formatStr)
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}
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source.format = SourceFormatV1
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minisignKey, err := minisign.NewPublicKey(minisignKeyStr)
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if err != nil {
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return source, err
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}
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in, cached, err := fetchWithCache(url, cacheFile, refreshDelay)
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if err != nil {
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return source, err
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}
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sigCacheFile := cacheFile + ".minisig"
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sigURL := url + ".minisig"
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sigStr, sigCached, err := fetchWithCache(sigURL, sigCacheFile, refreshDelay)
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if err != nil {
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return source, err
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}
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signature, err := minisign.DecodeSignature(sigStr)
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if err != nil {
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return source, err
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}
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res, err := minisignKey.Verify([]byte(in), signature)
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if err != nil || res != true {
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return source, err
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}
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if cached == false {
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if err = AtomicFileWrite(cacheFile, []byte(in)); err != nil {
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return source, err
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}
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}
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if sigCached == false {
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if err = AtomicFileWrite(sigCacheFile, []byte(sigStr)); err != nil {
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return source, err
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}
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}
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dlog.Noticef("Source [%s] loaded", url)
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source.in = in
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return source, nil
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}
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func (source *Source) Parse() ([]RegisteredServer, error) {
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var registeredServers []RegisteredServer
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csvReader := csv.NewReader(strings.NewReader(source.in))
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records, err := csvReader.ReadAll()
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if err != nil {
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return registeredServers, nil
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}
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for lineNo, record := range records {
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if len(record) == 0 {
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continue
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}
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if len(record) < 14 {
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return registeredServers, fmt.Errorf("Parse error at line %d", 1+lineNo)
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}
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if lineNo == 0 {
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continue
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}
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name := record[0]
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serverAddrStr := record[10]
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providerName := record[11]
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serverPkStr := record[12]
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stamp, err := NewServerStampFromLegacy(serverAddrStr, serverPkStr, providerName)
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if err != nil {
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return registeredServers, err
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}
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registeredServer := RegisteredServer{
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name: name, stamp: stamp,
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}
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registeredServers = append(registeredServers, registeredServer)
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}
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return registeredServers, nil
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}
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