path: root/ui/qt/qwhisper/whisper.go

package qwhisper

import (
    "fmt"
    "time"

    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethutil"
    "github.com/ethereum/go-ethereum/whisper"
    "gopkg.in/qml.v1"
)

func fromHex(s string) []byte {
    if len(s) > 1 {
        return ethutil.Hex2Bytes(s[2:])
    }
    return nil
}
func toHex(b []byte) string { return "0x" + ethutil.Bytes2Hex(b) }

type Whisper struct {
    *whisper.Whisper
    view qml.Object

    watches map[int]*Watch
}

func New(w *whisper.Whisper) *Whisper {
    return &Whisper{w, nil, make(map[int]*Watch)}
}

func (self *Whisper) SetView(view qml.Object) {
    self.view = view
}

func (self *Whisper) Post(data, to, from string, topics []string, priority, ttl uint32) {
    msg := whisper.NewMessage(fromHex(data))
    envelope, err := msg.Seal(time.Duration(priority*100000), whisper.Opts{
        Ttl:    time.Duration(ttl),
        To:     crypto.ToECDSAPub(fromHex(to)),
        From:   crypto.ToECDSA(fromHex(from)),
        Topics: whisper.TopicsFromString(topics...),
    })
    if err != nil {
        fmt.Println(err)
        // handle error
        return
    }

    if err := self.Whisper.Send(envelope); err != nil {
        fmt.Println(err)
        // handle error
        return
    }
}

func (self *Whisper) NewIdentity() string {
    return toHex(self.Whisper.NewIdentity().D.Bytes())
}

func (self *Whisper) HasIdentity(key string) bool {
    return self.Whisper.HasIdentity(crypto.ToECDSA(fromHex(key)))
}

func (self *Whisper) Watch(opts map[string]interface{}, view *qml.Common) int {
    filter := filterFromMap(opts)
    var i int
    filter.Fn = func(msg *whisper.Message) {
        if view != nil {
            view.Call("onShhMessage", ToQMessage(msg), i)
        }
    }

    i = self.Whisper.Watch(filter)
    self.watches[i] = &Watch{}

    return i
}

func filterFromMap(opts map[string]interface{}) (f whisper.Filter) {
    if to, ok := opts["to"].(string); ok {
        f.To = crypto.ToECDSA(fromHex(to))
    }
    if from, ok := opts["from"].(string); ok {
        f.From = crypto.ToECDSAPub(fromHex(from))
    }
    if topicList, ok := opts["topics"].(*qml.List); ok {
        var topics []string
        topicList.Convert(&topics)
        f.Topics = whisper.TopicsFromString(topics...)
    }

    return
}