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Turns out we might not need DID as the public key is embedded in the To and From strings. So we have all we need. One public key per object or player.
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,100 @@ | ||
package message | ||
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import ( | ||
"encoding/json" | ||
"fmt" | ||
"time" | ||
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"github.com/libp2p/go-libp2p/core/crypto" | ||
"github.com/libp2p/go-libp2p/core/peer" | ||
) | ||
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const Version = "1" | ||
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type Message struct { | ||
From string `json:"from"` | ||
To string `json:"to"` | ||
Version string `json:"version"` | ||
Data []byte `json:"data"` | ||
Created time.Time `json:"created"` | ||
Received time.Time `json:"received"` | ||
Signature []byte `json:"signature"` | ||
} | ||
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func New(from string, to string, data []byte) *Message { | ||
return &Message{ | ||
From: from, | ||
To: to, | ||
Version: Version, | ||
Created: time.Now(), | ||
Data: data, | ||
} | ||
} | ||
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func Marshal(m *Message) ([]byte, error) { | ||
return json.Marshal(m) | ||
} | ||
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func (m *Message) UnsignedMessage() *Message { | ||
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// This returns | ||
c := &Message{ | ||
To: m.To, | ||
From: m.From, | ||
Data: m.Data, | ||
Created: m.Created, | ||
Version: m.Version, | ||
} | ||
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return c | ||
} | ||
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func Unmarshal(data []byte) (*Message, error) { | ||
var msg Message | ||
if err := json.Unmarshal(data, &msg); err != nil { | ||
return nil, err | ||
} | ||
return &msg, nil | ||
} | ||
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func (m *Message) Sign(privateKey crypto.PrivKey) error { | ||
data, err := Marshal(m.UnsignedMessage()) | ||
if err != nil { | ||
return fmt.Errorf("failed to marshal message: %v", err) | ||
} | ||
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sig, err := privateKey.Sign(data) | ||
if err != nil { | ||
return fmt.Errorf("failed to sign message: %v", err) | ||
} | ||
m.Signature = sig | ||
return nil | ||
} | ||
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func (m *Message) Verify() (bool, error) { | ||
publicKey, err := extractPublicKeyFromIPNS(m.From) | ||
if err != nil { | ||
return false, err | ||
} | ||
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data, err := Marshal(m.UnsignedMessage()) | ||
if err != nil { | ||
return false, fmt.Errorf("failed to marshal message: %v", err) | ||
} | ||
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isValid, err := publicKey.Verify(data, m.Signature) | ||
if err != nil { | ||
return false, fmt.Errorf("error verifying message: %v", err) | ||
} | ||
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return isValid, nil | ||
} | ||
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func extractPublicKeyFromIPNS(ipns string) (crypto.PubKey, error) { | ||
pid, err := peer.Decode(ipns) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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return pid.ExtractPublicKey() | ||
} |