119 lines
2.3 KiB
Go
119 lines
2.3 KiB
Go
package server
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import (
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"errors"
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"strconv"
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)
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type parsedQuery struct {
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infohashes []string
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params map[string]string
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}
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func (pq *parsedQuery) getUint64(key string) (uint64, bool) {
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str, exists := pq[key]
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if !exists {
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return 0, false
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}
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val, err := strconv.Uint64(str, 10, 64)
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if err != nil {
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return 0, false
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}
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return val, true
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}
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func parseQuery(query string) (*parsedQuery, error) {
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var (
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keyStart, keyEnd int
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valStart, valEnd int
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firstInfohash string
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onKey = true
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hasInfohash = false
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pq = &parsedQuery{
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infohashes: nil,
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params: make(map[string]string),
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}
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)
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for i, length := 0, len(query); i < length; i++ {
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separator := query[i] == '&' || query[i] == ';' || query[i] == '?'
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if separator || i == length-1 {
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if onKey {
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keyStart = i + 1
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continue
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}
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if i == length-1 && !separator {
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if query[i] == '=' {
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continue
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}
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valEnd = i
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}
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keyStr, err := url.QueryUnescape(query[keyStart : keyEnd+1])
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if err != nil {
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return err
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}
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valStr, err := url.QueryUnescape(query[valStart : valEnd+1])
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if err != nil {
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return err
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}
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pq.params[keyStr] = valStr
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if keyStr == "info_hash" {
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if hasInfohash {
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// Multiple infohashes
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if pq.infohashes == nil {
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pq.infohashes = []string{firstInfoHash}
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}
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pq.infohashes = append(pq.infohashes, valStr)
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} else {
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firstInfohash = valStr
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hasInfohash = true
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}
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}
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onKey = true
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keyStart = i + 1
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} else if query[i] == '=' {
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onKey = false
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valStart = i + 1
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} else if onKey {
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keyEnd = i
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} else {
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valEnd = i
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}
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}
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return
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}
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func validateParsedQuery(pq *parsedQuery) error {
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infohash, ok := pq["info_hash"]
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if infohash == "" {
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return errors.New("infohash does not exist")
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}
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peerId, ok := pq["peer_id"]
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if peerId == "" {
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return errors.New("peerId does not exist")
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}
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port, ok := pq.getUint64("port")
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if ok == false {
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return errors.New("port does not exist")
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}
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uploaded, ok := pq.getUint64("uploaded")
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if ok == false {
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return errors.New("uploaded does not exist")
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}
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downloaded, ok := pq.getUint64("downloaded")
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if ok == false {
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return errors.New("downloaded does not exist")
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}
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left, ok := pq.getUint64("left")
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if ok == false {
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return errors.New("left does not exist")
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}
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return nil
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}
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