142 lines
3.7 KiB
Go
142 lines
3.7 KiB
Go
package http
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import (
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"net"
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"net/http"
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"github.com/chihaya/chihaya/bittorrent"
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)
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// ParseAnnounce parses an bittorrent.AnnounceRequest from an http.Request.
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//
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// If allowIPSpoofing is true, IPs provided via params will be used.
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// If realIPHeader is not empty string, the first value of the HTTP Header with
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// that name will be used.
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func ParseAnnounce(r *http.Request, realIPHeader string, allowIPSpoofing bool) (*bittorrent.AnnounceRequest, error) {
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qp, err := bittorrent.ParseURLData(r.RequestURI)
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if err != nil {
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return nil, err
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}
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request := &bittorrent.AnnounceRequest{Params: qp}
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eventStr, _ := qp.String("event")
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request.Event, err = bittorrent.NewEvent(eventStr)
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if err != nil {
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return nil, bittorrent.ClientError("failed to provide valid client event")
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}
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compactStr, _ := qp.String("compact")
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request.Compact = compactStr != "" && compactStr != "0"
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infoHashes := qp.InfoHashes()
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if len(infoHashes) < 1 {
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return nil, bittorrent.ClientError("no info_hash parameter supplied")
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}
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if len(infoHashes) > 1 {
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return nil, bittorrent.ClientError("multiple info_hash parameters supplied")
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}
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request.InfoHash = infoHashes[0]
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peerID, ok := qp.String("peer_id")
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if !ok {
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return nil, bittorrent.ClientError("failed to parse parameter: peer_id")
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}
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if len(peerID) != 20 {
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return nil, bittorrent.ClientError("failed to provide valid peer_id")
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}
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request.Peer.ID = bittorrent.PeerIDFromString(peerID)
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request.Left, err = qp.Uint64("left")
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if err != nil {
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return nil, bittorrent.ClientError("failed to parse parameter: left")
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}
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request.Downloaded, err = qp.Uint64("downloaded")
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if err != nil {
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return nil, bittorrent.ClientError("failed to parse parameter: downloaded")
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}
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request.Uploaded, err = qp.Uint64("uploaded")
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if err != nil {
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return nil, bittorrent.ClientError("failed to parse parameter: uploaded")
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}
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numwant, err := qp.Uint64("numwant")
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if err != nil {
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return nil, bittorrent.ClientError("failed to parse parameter: numwant")
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}
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request.NumWant = uint32(numwant)
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port, err := qp.Uint64("port")
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if err != nil {
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return nil, bittorrent.ClientError("failed to parse parameter: port")
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}
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request.Peer.Port = uint16(port)
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request.Peer.IP = requestedIP(r, qp, realIPHeader, allowIPSpoofing)
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if request.Peer.IP == nil {
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return nil, bittorrent.ClientError("failed to parse peer IP address")
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}
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// Sanitize IPv4 addresses to 4 bytes.
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if ip := request.Peer.IP.To4(); ip != nil {
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request.Peer.IP = ip
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}
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return request, nil
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}
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// ParseScrape parses an bittorrent.ScrapeRequest from an http.Request.
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func ParseScrape(r *http.Request) (*bittorrent.ScrapeRequest, error) {
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qp, err := bittorrent.ParseURLData(r.RequestURI)
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if err != nil {
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return nil, err
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}
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infoHashes := qp.InfoHashes()
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if len(infoHashes) < 1 {
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return nil, bittorrent.ClientError("no info_hash parameter supplied")
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}
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request := &bittorrent.ScrapeRequest{
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InfoHashes: infoHashes,
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Params: qp,
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}
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return request, nil
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}
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// requestedIP determines the IP address for a BitTorrent client request.
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//
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// If allowIPSpoofing is true, IPs provided via params will be used.
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// If realIPHeader is not empty string, the first value of the HTTP Header with
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// that name will be used.
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func requestedIP(r *http.Request, p bittorrent.Params, realIPHeader string, allowIPSpoofing bool) net.IP {
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if allowIPSpoofing {
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if ipstr, ok := p.String("ip"); ok {
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ip := net.ParseIP(ipstr)
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return ip
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}
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if ipstr, ok := p.String("ipv4"); ok {
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ip := net.ParseIP(ipstr)
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return ip
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}
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if ipstr, ok := p.String("ipv6"); ok {
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ip := net.ParseIP(ipstr)
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return ip
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}
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}
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if realIPHeader != "" {
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if ips, ok := r.Header[realIPHeader]; ok && len(ips) > 0 {
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ip := net.ParseIP(ips[0])
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return ip
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}
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}
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host, _, _ := net.SplitHostPort(r.RemoteAddr)
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return net.ParseIP(host)
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}
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