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Merge pull request #29 from rarimo/feat/poll-modification
Feat/poll modification
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,12 +1,7 @@ | ||
| type: object | ||
| required: | ||
| - id | ||
| - type | ||
| properties: | ||
| id: | ||
| type: string | ||
| description: Event ID | ||
| example: "059c81dd-2a54-44a8-8142-c15ad8f88949" | ||
| type: | ||
| type: string | ||
| enum: [ fulfill_poll_event ] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "math/big" | ||
| "os" | ||
|
|
||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/ethclient" | ||
| zkptypes "github.com/iden3/go-rapidsnark/types" | ||
| zkpverifier "github.com/iden3/go-rapidsnark/verifier" | ||
| "github.com/rarimo/geo-points-svc/internal/contracts/proposalsmt" | ||
| "github.com/rarimo/geo-points-svc/internal/contracts/proposalsstate" | ||
|
|
||
| "gitlab.com/distributed_lab/figure/v3" | ||
| "gitlab.com/distributed_lab/kit/comfig" | ||
| "gitlab.com/distributed_lab/kit/kv" | ||
| ) | ||
|
|
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| const pollVerificationKey = "./proof_keys/poll.json" | ||
|
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| var ( | ||
| ErrInvalidProposalEventID = errors.New("invalid proposal event id") | ||
| ErrInvalidRoot = errors.New("invalid root") | ||
| ErrInvalidChallengedEventID = errors.New("invalid challenged event id") | ||
| ) | ||
|
|
||
| const ( | ||
| PollChallengedNullifier = iota | ||
| PollNullifierTreeRoot | ||
| PollParticipationEventID | ||
| PollChallengedEventID | ||
| ) | ||
|
|
||
| type PollVerifierer interface { | ||
| PollVerifier() *PollVerifier | ||
| } | ||
|
|
||
| func NewPollVerifier(getter kv.Getter) PollVerifierer { | ||
| return &pollVerifier{ | ||
| getter: getter, | ||
| } | ||
| } | ||
|
|
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| type pollVerifier struct { | ||
| once comfig.Once | ||
| getter kv.Getter | ||
| } | ||
|
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| type PollVerifier struct { | ||
| RPC *ethclient.Client `fig:"rpc,required"` | ||
| ProposalStateAddress common.Address `fig:"proposal_state_address,required"` | ||
|
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| proposalsStateCaller *proposalsstate.ProposalsStateCaller | ||
| verificationKey []byte | ||
| } | ||
|
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| func (c *pollVerifier) PollVerifier() *PollVerifier { | ||
| return c.once.Do(func() interface{} { | ||
|
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| var cfg PollVerifier | ||
|
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| err := figure.Out(&cfg). | ||
| From(kv.MustGetStringMap(c.getter, "poll_verifier")). | ||
| With(figure.EthereumHooks, figure.BaseHooks). | ||
| Please() | ||
| if err != nil { | ||
| panic(fmt.Errorf("failed to figure out vote verifier config: %w", err)) | ||
| } | ||
|
|
||
| cfg.verificationKey, err = os.ReadFile(pollVerificationKey) | ||
| if err != nil { | ||
| panic(fmt.Errorf("failed to read pollVerificationKey: %w", err)) | ||
| } | ||
|
|
||
| cfg.proposalsStateCaller, err = proposalsstate.NewProposalsStateCaller(cfg.ProposalStateAddress, cfg.RPC) | ||
| if err != nil { | ||
| panic(fmt.Errorf("failed to create proposals state caller: %w", err)) | ||
| } | ||
|
|
||
| return &cfg | ||
| }).(*PollVerifier) | ||
| } | ||
|
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| func (v *PollVerifier) VerifyProof(proof zkptypes.ZKProof, proposalID, proposalEventID *big.Int) error { | ||
| proposalInfo, err := v.proposalsStateCaller.GetProposalInfo(nil, proposalID) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get proposal info: %w", err) | ||
| } | ||
|
|
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| proposalEventIDContract, err := v.proposalsStateCaller.GetProposalEventId(nil, proposalID) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get proposal event id: %w", err) | ||
| } | ||
|
|
||
| if proposalEventIDContract.Cmp(proposalEventID) != 0 { | ||
| return ErrInvalidProposalEventID | ||
| } | ||
|
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| proposalSMTAddress := proposalInfo.ProposalSMT | ||
| proposalSMTCaller, err := proposalsmt.NewProposalSMTCaller(proposalSMTAddress, v.RPC) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to create proposal smt caller: %w", err) | ||
| } | ||
|
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| root, err := proposalSMTCaller.GetRoot(nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to get root: %w", err) | ||
| } | ||
|
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| if new(big.Int).SetBytes(root[:]).String() != proof.PubSignals[PollNullifierTreeRoot] { | ||
| return ErrInvalidRoot | ||
| } | ||
|
|
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| if proof.PubSignals[PollChallengedEventID] != proofEventIDValue { | ||
| return ErrInvalidChallengedEventID | ||
| } | ||
|
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| if err = zkpverifier.VerifyGroth16(proof, v.verificationKey); err != nil { | ||
| return fmt.Errorf("failed to verify proof: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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