114 lines
2.9 KiB
Go
114 lines
2.9 KiB
Go
package http
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import (
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"net/http"
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"github.com/chihaya/chihaya/bittorrent"
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"github.com/chihaya/chihaya/frontend/http/bencode"
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)
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// WriteError communicates an error to a BitTorrent client over HTTP.
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func WriteError(w http.ResponseWriter, err error) error {
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message := "internal server error"
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if _, clientErr := err.(bittorrent.ClientError); clientErr {
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message = err.Error()
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}
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w.WriteHeader(http.StatusOK)
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return bencode.NewEncoder(w).Encode(bencode.Dict{
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"failure reason": message,
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})
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}
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// WriteAnnounceResponse communicates the results of an Announce to a
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// BitTorrent client over HTTP.
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func WriteAnnounceResponse(w http.ResponseWriter, resp *bittorrent.AnnounceResponse) error {
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bdict := bencode.Dict{
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"complete": resp.Complete,
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"incomplete": resp.Incomplete,
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"interval": resp.Interval,
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"min interval": resp.MinInterval,
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}
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// Add the peers to the dictionary in the compact format.
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if resp.Compact {
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var IPv4CompactDict, IPv6CompactDict []byte
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// Add the IPv4 peers to the dictionary.
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for _, peer := range resp.IPv4Peers {
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IPv4CompactDict = append(IPv4CompactDict, compact4(peer)...)
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}
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if len(IPv4CompactDict) > 0 {
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bdict["peers"] = IPv4CompactDict
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}
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// Add the IPv6 peers to the dictionary.
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for _, peer := range resp.IPv6Peers {
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IPv6CompactDict = append(IPv6CompactDict, compact6(peer)...)
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}
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if len(IPv6CompactDict) > 0 {
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bdict["peers6"] = IPv6CompactDict
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}
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return bencode.NewEncoder(w).Encode(bdict)
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}
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// Add the peers to the dictionary.
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var peers []bencode.Dict
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for _, peer := range resp.IPv4Peers {
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peers = append(peers, dict(peer))
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}
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for _, peer := range resp.IPv6Peers {
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peers = append(peers, dict(peer))
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}
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bdict["peers"] = peers
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return bencode.NewEncoder(w).Encode(bdict)
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}
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// WriteScrapeResponse communicates the results of a Scrape to a BitTorrent
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// client over HTTP.
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func WriteScrapeResponse(w http.ResponseWriter, resp *bittorrent.ScrapeResponse) error {
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filesDict := bencode.NewDict()
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for infohash, scrape := range resp.Files {
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filesDict[string(infohash[:])] = bencode.Dict{
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"complete": scrape.Complete,
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"incomplete": scrape.Incomplete,
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}
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}
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return bencode.NewEncoder(w).Encode(bencode.Dict{
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"files": filesDict,
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})
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}
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func compact4(peer bittorrent.Peer) (buf []byte) {
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if ip := peer.IP.To4(); ip == nil {
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panic("non-IPv4 IP for Peer in IPv4Peers")
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} else {
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buf = []byte(ip)
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}
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buf = append(buf, byte(peer.Port>>8))
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buf = append(buf, byte(peer.Port&0xff))
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return
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}
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func compact6(peer bittorrent.Peer) (buf []byte) {
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if ip := peer.IP.To16(); ip == nil {
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panic("non-IPv6 IP for Peer in IPv6Peers")
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} else {
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buf = []byte(ip)
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}
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buf = append(buf, byte(peer.Port>>8))
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buf = append(buf, byte(peer.Port&0xff))
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return
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}
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func dict(peer bittorrent.Peer) bencode.Dict {
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return bencode.Dict{
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"peer id": string(peer.ID[:]),
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"ip": peer.IP.String(),
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"port": peer.Port,
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}
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}
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