106 lines
3.2 KiB
Go
106 lines
3.2 KiB
Go
// Contains the external API to the whisper sub-protocol.
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package xeth
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import (
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"fmt"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/whisper"
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)
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var qlogger = logger.NewLogger("XSHH")
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// Whisper represents the API wrapper around the internal whisper implementation.
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type Whisper struct {
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*whisper.Whisper
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}
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// NewWhisper wraps an internal whisper client into an external API version.
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func NewWhisper(w *whisper.Whisper) *Whisper {
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return &Whisper{w}
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}
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// NewIdentity generates a new cryptographic identity for the client, and injects
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// it into the known identities for message decryption.
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func (self *Whisper) NewIdentity() string {
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identity := self.Whisper.NewIdentity()
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return common.ToHex(crypto.FromECDSAPub(&identity.PublicKey))
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}
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// HasIdentity checks if the the whisper node is configured with the private key
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// of the specified public pair.
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func (self *Whisper) HasIdentity(key string) bool {
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return self.Whisper.HasIdentity(crypto.ToECDSAPub(common.FromHex(key)))
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}
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// Post injects a message into the whisper network for distribution.
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func (self *Whisper) Post(payload string, to, from string, topics []string, priority, ttl uint32) error {
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// Decode the topic strings
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topicsDecoded := make([][]byte, len(topics))
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for i, topic := range topics {
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topicsDecoded[i] = common.FromHex(topic)
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}
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// Construct the whisper message and transmission options
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message := whisper.NewMessage(common.FromHex(payload))
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options := whisper.Options{
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To: crypto.ToECDSAPub(common.FromHex(to)),
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TTL: time.Duration(ttl) * time.Second,
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Topics: whisper.NewTopics(topicsDecoded...),
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}
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if len(from) != 0 {
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if key := self.Whisper.GetIdentity(crypto.ToECDSAPub(common.FromHex(from))); key != nil {
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options.From = key
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} else {
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return fmt.Errorf("unknown identity to send from: %s", from)
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}
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}
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// Wrap and send the message
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pow := time.Duration(priority) * time.Millisecond
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envelope, err := message.Wrap(pow, options)
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if err != nil {
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return err
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}
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if err := self.Whisper.Send(envelope); err != nil {
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return err
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}
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return nil
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}
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// Watch installs a new message handler to run in case a matching packet arrives
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// from the whisper network.
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func (self *Whisper) Watch(to, from string, topics [][]string, fn func(WhisperMessage)) int {
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// Decode the topic strings
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topicsDecoded := make([][][]byte, len(topics))
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for i, condition := range topics {
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topicsDecoded[i] = make([][]byte, len(condition))
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for j, topic := range condition {
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topicsDecoded[i][j] = common.FromHex(topic)
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}
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}
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// Assemble and inject the filter into the whisper client
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filter := whisper.Filter{
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To: crypto.ToECDSAPub(common.FromHex(to)),
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From: crypto.ToECDSAPub(common.FromHex(from)),
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Topics: whisper.NewFilterTopics(topicsDecoded...),
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}
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filter.Fn = func(message *whisper.Message) {
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fn(NewWhisperMessage(message))
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}
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return self.Whisper.Watch(filter)
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}
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// Messages retrieves all the currently pooled messages matching a filter id.
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func (self *Whisper) Messages(id int) []WhisperMessage {
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pool := self.Whisper.Messages(id)
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messages := make([]WhisperMessage, len(pool))
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for i, message := range pool {
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messages[i] = NewWhisperMessage(message)
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}
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return messages
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}
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