59 lines
1.9 KiB
Go
59 lines
1.9 KiB
Go
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package applications
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import (
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"cwtch.im/tapir"
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"cwtch.im/tapir/primitives/privacypass"
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"encoding/json"
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"git.openprivacy.ca/openprivacy/libricochet-go/log"
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)
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// TokenApplication provides Tokens for PoW
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type TokenApplication struct {
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TranscriptApp
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TokenService *privacypass.TokenServer
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Tokens []*privacypass.Token
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}
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// HasTokensCapability is granted once the client has obtained signed tokens
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const HasTokensCapability = tapir.Capability("HasTokensCapability")
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// NewInstance should always return a new instantiation of the application.
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func (powapp *TokenApplication) NewInstance() tapir.Application {
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app := new(TokenApplication)
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app.TokenService = powapp.TokenService
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return app
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}
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// Init is run when the connection is first started.
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func (powapp *TokenApplication) Init(connection tapir.Connection) {
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powapp.Transcript().NewProtocol("token-app")
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log.Debugf(powapp.Transcript().OutputTranscriptToAudit())
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if connection.IsOutbound() {
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tokens, blinded := privacypass.GenerateBlindedTokenBatch(10)
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data, _ := json.Marshal(blinded)
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connection.Send(data)
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var signedBatch privacypass.SignedBatchWithProof
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err := json.Unmarshal(connection.Expect(), &signedBatch)
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if err == nil {
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verified := privacypass.UnblindSignedTokenBatch(tokens, blinded, signedBatch.SignedTokens, powapp.TokenService.Y, signedBatch.Proof, powapp.Transcript())
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if verified {
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log.Debugf("Successfully obtained signed tokens")
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powapp.Tokens = tokens
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connection.SetCapability(HasTokensCapability)
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return
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}
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log.Debugf("Failed to verify signed token batch")
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}
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} else {
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var blinded []privacypass.BlindedToken
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err := json.Unmarshal(connection.Expect(), &blinded)
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if err == nil {
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batchProof := powapp.TokenService.SignBlindedTokenBatch(blinded, powapp.Transcript())
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log.Debugf(powapp.Transcript().OutputTranscriptToAudit())
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data, _ := json.Marshal(batchProof)
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connection.Send(data)
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return
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}
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}
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}
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