1
{"Common.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n 
     You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open
    -source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is distributed on an 
    \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing 
    permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\n/*\n  Common Utility 
    librarries.\n  I. Addresses (extending address).\n*/\nlibrary Addresses {\n    function isContract(address account) internal view returns (bool) 
    {\n        uint256 size;\n        assembly {\n            size := extcodesize(account)\n        }\n        return size \u003e 0;\n    }\n\n    
    function performEthTransfer(address recipient, uint256 amount) internal {\n        (bool success, ) = recipient.call{value: amount}(\"\"); // 
    NOLINT: low-level-calls.\n        require(success, \"ETH_TRANSFER_FAILED\");\n    }\n\n    /*\n      Safe wrapper around ERC20/ERC721 calls.\n     
     This is required because many deployed ERC20 contracts don\u0027t return a value.\n      See https://github.com/ethereum/solidity/issues/4116.\n  
      */\n    function safeTokenContractCall(address tokenAddress, bytes memory callData) internal {\n        require(isContract(tokenAddress), 
    \"BAD_TOKEN_ADDRESS\");\n        // NOLINTNEXTLINE: low-level-calls.\n        (bool success, bytes memory returndata) = tokenAddress.call(callData
    );\n        require(success, string(returndata));\n\n        if (returndata.length \u003e 0) {\n            require(abi.decode(returndata, (bool)), 
    \"TOKEN_OPERATION_FAILED\");\n        }\n    }\n\n    /*\n      Validates that the passed contract address is of a real contract,\n      and that 
    its id hash (as infered fromn identify()) matched the expected one.\n    */\n    function validateContractId(address contractAddress, bytes32 
    expectedIdHash) internal {\n        require(isContract(contractAddress), \"ADDRESS_NOT_CONTRACT\");\n        (bool success, bytes memory returndata
    ) = contractAddress.call( // NOLINT: low-level-calls.\n            abi.encodeWithSignature(\"identify()\")\n        );\n        require(success, 
    \"FAILED_TO_IDENTIFY_CONTRACT\");\n        string memory realContractId = abi.decode(returndata, (string));\n        require(\n            
    keccak256(abi.encodePacked(realContractId)) == expectedIdHash,\n            \"UNEXPECTED_CONTRACT_IDENTIFIER\"\n        );\n    }\n}\n\n/*\n  II. 
    StarkExTypes - Common data types.\n*/\nlibrary StarkExTypes {\n    // Structure representing a list of verifiers (validity/availability).\n    // A 
    statement is valid only if all the verifiers in the list agree on it.\n    // Adding a verifier to the list is immediate - this is used for fast 
    resolution of\n    // any soundness issues.\n    // Removing from the list is time-locked, to ensure that any user of the system\n    // not 
    content with the announced removal has ample time to leave the system before it is\n    // removed.\n    struct ApprovalChainData {\n        
    address[] list;\n        // Represents the time after which the verifier with the given address can be removed.\n        // Removal of the verifier 
    with address A is allowed only in the case the value\n        // of unlockedForRemovalTime[A] != 0 and unlockedForRemovalTime[A] \u003c (current 
    time).\n        mapping(address =\u003e uint256) unlockedForRemovalTime;\n    }\n}\n"},"Governance.sol":{"content":"/*\n  Copyright 2019-2022 
    StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance 
    with the License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable 
    law or agreed to in writing,\n  software distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF 
    ANY KIND, either express or implied.\n  See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n
    // SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\nimport \"MGovernance.sol\";\n\n/*\n  Implements Generic Governance, applicable 
    for both proxy and main contract, and possibly others.\n  Notes:\n   The use of the same function names by both the Proxy and a delegated 
    implementation\n   is not possible since calling the implementation functions is done via the default function\n   of the Proxy. For this reason, 
    for example, the implementation of MainContract (MainGovernance)\n   exposes mainIsGovernor, which calls the internal _isGovernor method.\n
    */\nabstract contract Governance is MGovernance {\n    event LogNominatedGovernor(address nominatedGovernor);\n    event LogNewGovernorAccepted
    (address acceptedGovernor);\n    event LogRemovedGovernor(address removedGovernor);\n    event LogNominationCancelled();\n\n    function 
    getGovernanceInfo() internal view virtual returns (GovernanceInfoStruct storage);\n\n    /*\n      Current code intentionally prevents governance 
    re-initialization.\n      This may be a problem in an upgrade situation, in a case that the upgrade-to implementation\n      performs an 
    initialization (for real) and within that calls initGovernance().\n\n      Possible workarounds:\n      1. Clearing the governance info altogether 
    by changing the MAIN_GOVERNANCE_INFO_TAG.\n         This will remove existing main governance information.\n      2. Modify the require part in 
    this function, so that it will exit quietly\n         when trying to re-initialize (uncomment the lines below).\n    */\n    function 
    initGovernance() internal {\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(!gub.initialized, 
    \"ALREADY_INITIALIZED\");\n        gub.initialized = true; // to ensure addGovernor() won\u0027t fail.\n        // Add the initial governer.\n     
       addGovernor(msg.sender);\n    }\n\n    function _isGovernor(address testGovernor) internal view override returns (bool) {\n        
    GovernanceInfoStruct storage gub = getGovernanceInfo();\n        return gub.effectiveGovernors[testGovernor];\n    }\n\n    /*\n      Cancels the 
    nomination of a governor candidate.\n    */\n    function _cancelNomination() internal onlyGovernance {\n        GovernanceInfoStruct storage gub = 
    getGovernanceInfo();\n        gub.candidateGovernor = address(0x0);\n        emit LogNominationCancelled();\n    }\n\n    function 
    _nominateNewGovernor(address newGovernor) internal onlyGovernance {\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        
    require(!_isGovernor(newGovernor), \"ALREADY_GOVERNOR\");\n        gub.candidateGovernor = newGovernor;\n        emit LogNominatedGovernor
    (newGovernor);\n    }\n\n    /*\n      The addGovernor is called in two cases:\n      1. by _acceptGovernance when a new governor accepts its role
    .\n      2. by initGovernance to add the initial governor.\n      The difference is that the init path skips the nominate step\n      that would 
    fail because of the onlyGovernance modifier.\n    */\n    function addGovernor(address newGovernor) private {\n        require(!_isGovernor
    (newGovernor), \"ALREADY_GOVERNOR\");\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        gub.effectiveGovernors[newGovernor] 
    = true;\n    }\n\n    function _acceptGovernance() internal {\n        // The new governor was proposed as a candidate by the current governor.\n  
          GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(msg.sender == gub.candidateGovernor, \"ONLY_CANDIDATE_GOVERNOR\"
    );\n\n        // Update state.\n        addGovernor(gub.candidateGovernor);\n        gub.candidateGovernor = address(0x0);\n\n        // Send a 
    notification about the change of governor.\n        emit LogNewGovernorAccepted(msg.sender);\n    }\n\n    /*\n      Remove a governor from office
    .\n    */\n    function _removeGovernor(address governorForRemoval) internal onlyGovernance {\n        require(msg.sender != governorForRemoval, 
    \"GOVERNOR_SELF_REMOVE\");\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(_isGovernor(governorForRemoval), 
    \"NOT_GOVERNOR\");\n        gub.effectiveGovernors[governorForRemoval] = false;\n        emit LogRemovedGovernor(governorForRemoval);\n    }\n}\n"}
    ,"GovernanceStorage.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the 
    \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www
    .starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is 
    distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific 
    language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\nimport 
    \"MGovernance.sol\";\n\n/*\n  Holds the governance slots for ALL entities, including proxy and the main contract.\n*/\ncontract GovernanceStorage 
    {\n    // A map from a Governor tag to its own GovernanceInfoStruct.\n    mapping(string =\u003e GovernanceInfoStruct) internal governanceInfo; 
    //NOLINT uninitialized-state.\n}\n"},"MGovernance.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed under the 
    Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the 
    License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software 
    distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  
    See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0
    .\npragma solidity ^0.6.12;\n\nstruct GovernanceInfoStruct {\n    mapping(address =\u003e bool) effectiveGovernors;\n    address candidateGovernor
    ;\n    bool initialized;\n}\n\nabstract contract MGovernance {\n    function _isGovernor(address testGovernor) internal view virtual returns (bool
    );\n\n    /*\n      Allows calling the function only by a Governor.\n    */\n    modifier onlyGovernance() {\n        require(_isGovernor(msg
    .sender), \"ONLY_GOVERNANCE\");\n        _;\n    }\n}\n"},"Proxy.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed 
    under the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a 
    copy of the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  
    software distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
    implied.\n  See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: 
    Apache-2.0.\npragma solidity ^0.6.12;\n\nimport \"ProxyGovernance.sol\";\nimport \"ProxyStorage.sol\";\nimport \"StorageSlots.sol\";\nimport 
    \"Common.sol\";\n\n/**\n  The Proxy contract implements delegation of calls to other contracts (`implementations`), with\n  proper forwarding of 
    return values and revert reasons. This pattern allows retaining the contract\n  storage while replacing implementation code.\n\n  The following 
    operations are supported by the proxy contract:\n\n  - :sol:func:`addImplementation`: Defines a new implementation, the data with which it should 
    be initialized and whether this will be the last version of implementation.\n  - :sol:func:`upgradeTo`: Once an implementation is added, the 
    governor may upgrade to that implementation only after a safety time period has passed (time lock), the current implementation is not the last 
    version and the implementation is not frozen (see :sol:mod:`FullWithdrawals`).\n  - :sol:func:`removeImplementation`: Any announced implementation 
    may be removed. Removing an implementation is especially important once it has been used for an upgrade in order to avoid an additional unwanted 
    revert to an older version.\n\n  The only entity allowed to perform the above operations is the proxy governor\n  (see :sol:mod:`ProxyGovernance`
    ).\n\n  Every implementation is required to have an `initialize` function that replaces the constructor\n  of a normal contract. Furthermore, the 
    only parameter of this function is an array of bytes\n  (`data`) which may be decoded arbitrarily by the `initialize` function. It is up to the\n  
    implementation to ensure that this function cannot be run more than once if so desired.\n\n  When an implementation is added (:sol:func
    :`addImplementation`) the initialization `data` is also\n  announced, allowing users of the contract to analyze the full effect of an upgrade to 
    the new\n  implementation. During an :sol:func:`upgradeTo`, the `data` is provided again and only if it is\n  identical to the announced `data` is 
    the upgrade performed by pointing the proxy to the new\n  implementation and calling its `initialize` function with this `data`.\n\n  It is the 
    responsibility of the implementation not to overwrite any storage belonging to the\n  proxy (`ProxyStorage`). In addition, upon upgrade, the new 
    implementation is assumed to be\n  backward compatible with previous implementations with respect to the storage used until that\n  point.\n
    */\ncontract Proxy is ProxyStorage, ProxyGovernance, StorageSlots {\n    // Emitted when the active implementation is replaced.\n    event 
    ImplementationUpgraded(address indexed implementation, bytes initializer);\n\n    // Emitted when an implementation is submitted as an upgrade 
    candidate and a time lock\n    // is activated.\n    event ImplementationAdded(address indexed implementation, bytes initializer, bool finalize
    );\n\n    // Emitted when an implementation is removed from the list of upgrade candidates.\n    event ImplementationRemoved(address indexed 
    implementation, bytes initializer, bool finalize);\n\n    // Emitted when the implementation is finalized.\n    event FinalizedImplementation
    (address indexed implementation);\n\n    using Addresses for address;\n\n    string public constant PROXY_VERSION = \"3.0.1\";\n\n    constructor
    (uint256 upgradeActivationDelay) public {\n        initGovernance();\n        setUpgradeActivationDelay(upgradeActivationDelay);\n    }\n\n    
    function setUpgradeActivationDelay(uint256 delayInSeconds) private {\n        bytes32 slot = UPGRADE_DELAY_SLOT;\n        assembly {\n            
    sstore(slot, delayInSeconds)\n        }\n    }\n\n    function getUpgradeActivationDelay() public view returns (uint256 delay) {\n        bytes32 
    slot = UPGRADE_DELAY_SLOT;\n        assembly {\n            delay := sload(slot)\n        }\n        return delay;\n    }\n\n    /*\n      Returns 
    the address of the current implementation.\n    */\n    // NOLINTNEXTLINE external-function.\n    function implementation() public view returns 
    (address _implementation) {\n        bytes32 slot = IMPLEMENTATION_SLOT;\n        assembly {\n            _implementation := sload(slot)\n        
    }\n    }\n\n    /*\n      Returns true if the implementation is frozen.\n      If the implementation was not assigned yet, returns false.\n    */\n 
       function implementationIsFrozen() private returns (bool) {\n        address _implementation = implementation();\n\n        // We can\u0027t call 
    low level implementation before it\u0027s assigned. (i.e. ZERO).\n        if (_implementation == address(0x0)) {\n            return false;\n      
      }\n\n        // NOLINTNEXTLINE: low-level-calls.\n        (bool success, bytes memory returndata) = _implementation.delegatecall(\n            
    abi.encodeWithSignature(\"isFrozen()\")\n        );\n        require(success, string(returndata));\n        return abi.decode(returndata, (bool
    ));\n    }\n\n    /*\n      This method blocks delegation to initialize().\n      Only upgradeTo should be able to delegate call to initialize().\n 
       */\n    function initialize(\n        bytes calldata /*data*/\n    ) external pure {\n        revert(\"CANNOT_CALL_INITIALIZE\");\n    }\n\n    
    modifier notFinalized() {\n        require(isNotFinalized(), \"IMPLEMENTATION_FINALIZED\");\n        _;\n    }\n\n    /*\n      Forbids calling the 
    function if the implementation is frozen.\n      This modifier relies on the lower level (logical contract) implementation of isFrozen().\n    */\n 
       modifier notFrozen() {\n        require(!implementationIsFrozen(), \"STATE_IS_FROZEN\");\n        _;\n    }\n\n    /*\n      This entry point 
    serves only transactions with empty calldata. (i.e. pure value transfer tx).\n      We don\u0027t expect to receive such, thus block them.\n    
    */\n    receive() external payable {\n        revert(\"CONTRACT_NOT_EXPECTED_TO_RECEIVE\");\n    }\n\n    /*\n      Contract\u0027s default 
    function. Delegates execution to the implementation contract.\n      It returns back to the external caller whatever the implementation delegated 
    code returns.\n    */\n    fallback() external payable {\n        address _implementation = implementation();\n        require(_implementation != 
    address(0x0), \"MISSING_IMPLEMENTATION\");\n\n        assembly {\n            // Copy msg.data. We take full control of memory in this inline 
    assembly\n            // block because it will not return to Solidity code. We overwrite the\n            // Solidity scratch pad at memory 
    position 0.\n            calldatacopy(0, 0, calldatasize())\n\n            // Call the implementation.\n            // out and outsize are 0 for 
    now, as we don\u0027t know the out size yet.\n            let result := delegatecall(gas(), _implementation, 0, calldatasize(), 0, 0)\n\n          
      // Copy the returned data.\n            returndatacopy(0, 0, returndatasize())\n\n            switch result\n            // delegatecall returns 
    0 on error.\n            case 0 {\n                revert(0, returndatasize())\n            }\n            default {\n                return(0, 
    returndatasize())\n            }\n        }\n    }\n\n    /*\n      Sets the implementation address of the proxy.\n    */\n    function 
    setImplementation(address newImplementation) private {\n        bytes32 slot = IMPLEMENTATION_SLOT;\n        assembly {\n            sstore(slot, 
    newImplementation)\n        }\n    }\n\n    /*\n      Returns true if the contract is not in the finalized state.\n    */\n    function 
    isNotFinalized() public view returns (bool notFinal) {\n        bytes32 slot = FINALIZED_STATE_SLOT;\n        uint256 slotValue;\n        assembly 
    {\n            slotValue := sload(slot)\n        }\n        notFinal = (slotValue == 0);\n    }\n\n    /*\n      Marks the current implementation 
    as finalized.\n    */\n    function setFinalizedFlag() private {\n        bytes32 slot = FINALIZED_STATE_SLOT;\n        assembly {\n            
    sstore(slot, 0x1)\n        }\n    }\n\n    /*\n      Introduce an implementation and its initialization vector,\n      and start the time-lock 
    before it can be upgraded to.\n      addImplementation is not blocked when frozen or finalized.\n      (upgradeTo API is blocked when finalized or 
    frozen).\n    */\n    function addImplementation(\n        address newImplementation,\n        bytes calldata data,\n        bool finalize\n    ) 
    external onlyGovernance {\n        require(newImplementation.isContract(), \"ADDRESS_NOT_CONTRACT\");\n\n        bytes32 implVectorHash = keccak256
    (abi.encode(newImplementation, data, finalize));\n\n        uint256 activationTime = block.timestamp + getUpgradeActivationDelay();\n\n        
    enabledTime[implVectorHash] = activationTime;\n        emit ImplementationAdded(newImplementation, data, finalize);\n    }\n\n    /*\n      Removes 
    a candidate implementation.\n      Note that it is possible to remove the current implementation. Doing so doesn\u0027t affect the\n      current 
    implementation, but rather revokes it as a future candidate.\n    */\n    function removeImplementation(\n        address removedImplementation,\n 
           bytes calldata data,\n        bool finalize\n    ) external onlyGovernance {\n        bytes32 implVectorHash = keccak256(abi.encode
    (removedImplementation, data, finalize));\n\n        // If we have initializer, we set the hash of it.\n        uint256 activationTime = 
    enabledTime[implVectorHash];\n        require(activationTime \u003e 0, \"UNKNOWN_UPGRADE_INFORMATION\");\n        delete 
    enabledTime[implVectorHash];\n        emit ImplementationRemoved(removedImplementation, data, finalize);\n    }\n\n    /*\n      Upgrades the proxy 
    to a new implementation, with its initialization.\n      to upgrade successfully, implementation must have been added time-lock agreeably\n      
    before, and the init vector must be identical ot the one submitted before.\n\n      Upon assignment of new implementation address,\n      its 
    initialize will be called with the initializing vector (even if empty).\n      Therefore, the implementation MUST must have such a method.\n\n     
     Note - Initialization data is committed to in advance, therefore it must remain valid\n      until the actual contract upgrade takes place.\n\n   
       Care should be taken regarding initialization data and flow when planning the contract upgrade.\n\n      When planning contract upgrade, special 
    care is also needed with regard to governance\n      (See comments in Governance.sol).\n    */\n    // NOLINTNEXTLINE: reentrancy-events timestamp
    .\n    function upgradeTo(\n        address newImplementation,\n        bytes calldata data,\n        bool finalize\n    ) external payable 
    onlyGovernance notFinalized notFrozen {\n        bytes32 implVectorHash = keccak256(abi.encode(newImplementation, data, finalize));\n        
    uint256 activationTime = enabledTime[implVectorHash];\n        require(activationTime \u003e 0, \"UNKNOWN_UPGRADE_INFORMATION\");\n        require
    (newImplementation.isContract(), \"ADDRESS_NOT_CONTRACT\");\n\n        // On the first time an implementation is set - time-lock should not be 
    enforced.\n        require(\n            activationTime \u003c= block.timestamp || implementation() == address(0x0),\n            
    \"UPGRADE_NOT_ENABLED_YET\"\n        );\n\n        setImplementation(newImplementation);\n\n        // NOLINTNEXTLINE: low-level-calls controlled
    -delegatecall.\n        (bool success, bytes memory returndata) = newImplementation.delegatecall(\n            abi.encodeWithSelector(this
    .initialize.selector, data)\n        );\n        require(success, string(returndata));\n\n        // Verify that the new implementation is not 
    frozen post initialization.\n        // NOLINTNEXTLINE: low-level-calls controlled-delegatecall.\n        (success, returndata) = newImplementation
    .delegatecall(\n            abi.encodeWithSignature(\"isFrozen()\")\n        );\n        require(success, \"CALL_TO_ISFROZEN_REVERTED\");\n        
    require(!abi.decode(returndata, (bool)), \"NEW_IMPLEMENTATION_FROZEN\");\n\n        if (finalize) {\n            setFinalizedFlag();\n            
    emit FinalizedImplementation(newImplementation);\n        }\n\n        emit ImplementationUpgraded(newImplementation, data);\n    }\n}\n"}
    ,"ProxyGovernance.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the 
    \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www
    .starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is 
    distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific 
    language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12
    ;\n\nimport \"Governance.sol\";\nimport \"GovernanceStorage.sol\";\n\n/**\n  The Proxy contract is governed by one or more Governors of which the 
    initial one is the\n  deployer of the contract.\n\n  A governor has the sole authority to perform the following operations:\n\n  1. Nominate 
    additional governors (:sol:func:`proxyNominateNewGovernor`)\n  2. Remove other governors (:sol:func:`proxyRemoveGovernor`)\n  3. Add new 
    `implementations` (proxied contracts)\n  4. Remove (new or old) `implementations`\n  5. Update `implementations` after a timelock allows it\n\n  
    Adding governors is performed in a two step procedure:\n\n  1. First, an existing governor nominates a new governor (:sol:func
    :`proxyNominateNewGovernor`)\n  2. Then, the new governor must accept governance to become a governor (:sol:func:`proxyAcceptGovernance`)\n\n  This 
    two step procedure ensures that a governor public key cannot be nominated unless there is an\n  entity that has the corresponding private key. This 
    is intended to prevent errors in the addition\n  process.\n\n  The governor private key should typically be held in a secure cold wallet or managed 
    via a\n  multi-sig contract.\n*/\n/*\n  Implements Governance for the proxy contract.\n  It is a thin wrapper to the Governance contract,\n  which 
    is needed so that it can have non-colliding function names,\n  and a specific tag (key) to allow unique state storage.\n*/\ncontract 
    ProxyGovernance is GovernanceStorage, Governance {\n    // The tag is the string key that is used in the Governance storage mapping.\n    string 
    public constant PROXY_GOVERNANCE_TAG = \"StarkEx.Proxy.2019.GovernorsInformation\";\n\n    /*\n      Returns the GovernanceInfoStruct associated 
    with the governance tag.\n    */\n    function getGovernanceInfo() internal view override returns (GovernanceInfoStruct storage) {\n        return 
    governanceInfo[PROXY_GOVERNANCE_TAG];\n    }\n\n    function proxyIsGovernor(address testGovernor) external view returns (bool) {\n        return 
    _isGovernor(testGovernor);\n    }\n\n    function proxyNominateNewGovernor(address newGovernor) external {\n        _nominateNewGovernor
    (newGovernor);\n    }\n\n    function proxyRemoveGovernor(address governorForRemoval) external {\n        _removeGovernor(governorForRemoval);\n   
     }\n\n    function proxyAcceptGovernance() external {\n        _acceptGovernance();\n    }\n\n    function proxyCancelNomination() external {\n    
        _cancelNomination();\n    }\n}\n"},"ProxyStorage.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare Industries Ltd.\n\n  Licensed under the 
    Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the 
    License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software 
    distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  
    See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0
    .\npragma solidity ^0.6.12;\n\nimport \"GovernanceStorage.sol\";\n\n/*\n  Holds the Proxy-specific state variables.\n  This contract is inherited 
    by the GovernanceStorage (and indirectly by MainStorage)\n  to prevent collision hazard.\n*/\ncontract ProxyStorage is GovernanceStorage {\n    // 
    NOLINTNEXTLINE: naming-convention uninitialized-state.\n    mapping(address =\u003e bytes32) internal initializationHash_DEPRECATED;\n\n    // The 
    time after which we can switch to the implementation.\n    // Hash(implementation, data, finalize) =\u003e time.\n    mapping(bytes32 =\u003e 
    uint256) internal enabledTime;\n\n    // A central storage of the flags whether implementation has been initialized.\n    // Note - it can be used 
    flexibly enough to accommodate multiple levels of initialization\n    // (i.e. using different key salting schemes for different initialization 
    levels).\n    mapping(bytes32 =\u003e bool) internal initialized;\n}\n"},"StorageSlots.sol":{"content":"/*\n  Copyright 2019-2022 StarkWare 
    Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the 
    License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or 
    agreed to in writing,\n  software distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY 
    KIND, either express or implied.\n  See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// 
    SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\n/**\n  StorageSlots holds the arbitrary storage slots used throughout the Proxy 
    pattern.\n  Storage address slots are a mechanism to define an arbitrary location, that will not be\n  overlapped by the logical contracts.\n
    */\ncontract StorageSlots {\n    // Storage slot with the address of the current implementation.\n    // The address of the slot is keccak256
    (\"StarkWare2019.implemntation-slot\").\n    // We need to keep this variable stored outside of the commonly used space,\n    // so that it\u0027s 
    not overrun by the logical implementation (the proxied contract).\n    bytes32 internal constant IMPLEMENTATION_SLOT =\n        
    0x177667240aeeea7e35eabe3a35e18306f336219e1386f7710a6bf8783f761b24;\n\n    // Storage slot with the address of the call-proxy current 
    implementation.\n    // The address of the slot is keccak256(\"\u0027StarkWare2020.CallProxy.Implemntation.Slot\u0027\").\n    // We need to keep 
    this variable stored outside of the commonly used space.\n    // so that it\u0027s not overrun by the logical implementation (the proxied contract
    ).\n    bytes32 internal constant CALL_PROXY_IMPL_SLOT =\n        0x7184681641399eb4ad2fdb92114857ee6ff239f94ad635a1779978947b8843be;\n\n    // 
    This storage slot stores the finalization flag.\n    // Once the value stored in this slot is set to non-zero\n    // the proxy blocks 
    implementation upgrades.\n    // The current implementation is then referred to as Finalized.\n    // Web3.solidityKeccak([\u0027string\u0027], 
    [\"StarkWare2019.finalization-flag-slot\"]).\n    bytes32 internal constant FINALIZED_STATE_SLOT =\n        
    0x7d433c6f837e8f93009937c466c82efbb5ba621fae36886d0cac433c5d0aa7d2;\n\n    // Storage slot to hold the upgrade delay (time-lock).\n    // The 
    intention of this slot is to allow modification using an EIC.\n    // Web3.solidityKeccak([\u0027string\u0027], [\u0027StarkWare.Upgradibility
    .Delay.Slot\u0027]).\n    bytes32 public constant UPGRADE_DELAY_SLOT =\n        0xc21dbb3089fcb2c4f4c6a67854ab4db2b0f233ea4b21b21f912d52d18fc5db1f
    ;\n}\n"}}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

1
{"Common.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n 
     You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open
    -source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is distributed on an 
    \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific language governing 
    permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\n/*\n  Common Utility 
    librarries.\n  I. Addresses (extending address).\n*/\nlibrary Addresses {\n    function isContract(address account) internal view returns (bool) 
    {\n        uint256 size;\n        assembly {\n            size := extcodesize(account)\n        }\n        return size \u003e 0;\n    }\n\n    
    function performEthTransfer(address recipient, uint256 amount) internal {\n        (bool success, ) = recipient.call{value: amount}(\"\"); // 
    NOLINT: low-level-calls.\n        require(success, \"ETH_TRANSFER_FAILED\");\n    }\n\n    /*\n      Safe wrapper around ERC20/ERC721 calls.\n     
     This is required because many deployed ERC20 contracts don\u0027t return a value.\n      See https://github.com/ethereum/solidity/issues/4116.\n  
      */\n    function safeTokenContractCall(address tokenAddress, bytes memory callData) internal {\n        require(isContract(tokenAddress), 
    \"BAD_TOKEN_ADDRESS\");\n        // NOLINTNEXTLINE: low-level-calls.\n        (bool success, bytes memory returndata) = tokenAddress.call(callData
    );\n        require(success, string(returndata));\n\n        if (returndata.length \u003e 0) {\n            require(abi.decode(returndata, (bool)), 
    \"TOKEN_OPERATION_FAILED\");\n        }\n    }\n\n    /*\n      Validates that the passed contract address is of a real contract,\n      and that 
    its id hash (as infered fromn identify()) matched the expected one.\n    */\n    function validateContractId(address contractAddress, bytes32 
    expectedIdHash) internal {\n        require(isContract(contractAddress), \"ADDRESS_NOT_CONTRACT\");\n        (bool success, bytes memory returndata
    ) = contractAddress.call( // NOLINT: low-level-calls.\n            abi.encodeWithSignature(\"identify()\")\n        );\n        require(success, 
    \"FAILED_TO_IDENTIFY_CONTRACT\");\n        string memory realContractId = abi.decode(returndata, (string));\n        require(\n            
    keccak256(abi.encodePacked(realContractId)) == expectedIdHash,\n            \"UNEXPECTED_CONTRACT_IDENTIFIER\"\n        );\n    }\n}\n\n/*\n  II. 
    StarkExTypes - Common data types.\n*/\nlibrary StarkExTypes {\n    // Structure representing a list of verifiers (validity/availability).\n    // A 
    statement is valid only if all the verifiers in the list agree on it.\n    // Adding a verifier to the list is immediate - this is used for fast 
    resolution of\n    // any soundness issues.\n    // Removing from the list is time-locked, to ensure that any user of the system\n    // not 
    content with the announced removal has ample time to leave the system before it is\n    // removed.\n    struct ApprovalChainData {\n        
    address[] list;\n        // Represents the time after which the verifier with the given address can be removed.\n        // Removal of the verifier 
    with address A is allowed only in the case the value\n        // of unlockedForRemovalTime[A] != 0 and unlockedForRemovalTime[A] \u003c (current 
    time).\n        mapping(address =\u003e uint256) unlockedForRemovalTime;\n    }\n}\n"},"Governance.sol":{"content":"/*\n  Copyright 2019-2021 
    StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance 
    with the License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable 
    law or agreed to in writing,\n  software distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF 
    ANY KIND, either express or implied.\n  See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n
    // SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\nimport \"MGovernance.sol\";\n\n/*\n  Implements Generic Governance, applicable 
    for both proxy and main contract, and possibly others.\n  Notes:\n   The use of the same function names by both the Proxy and a delegated 
    implementation\n   is not possible since calling the implementation functions is done via the default function\n   of the Proxy. For this reason, 
    for example, the implementation of MainContract (MainGovernance)\n   exposes mainIsGovernor, which calls the internal isGovernor method.\n
    */\nabstract contract Governance is MGovernance {\n    event LogNominatedGovernor(address nominatedGovernor);\n    event LogNewGovernorAccepted
    (address acceptedGovernor);\n    event LogRemovedGovernor(address removedGovernor);\n    event LogNominationCancelled();\n\n    function 
    getGovernanceInfo() internal view virtual returns (GovernanceInfoStruct storage);\n\n    /*\n      Current code intentionally prevents governance 
    re-initialization.\n      This may be a problem in an upgrade situation, in a case that the upgrade-to implementation\n      performs an 
    initialization (for real) and within that calls initGovernance().\n\n      Possible workarounds:\n      1. Clearing the governance info altogether 
    by changing the MAIN_GOVERNANCE_INFO_TAG.\n         This will remove existing main governance information.\n      2. Modify the require part in 
    this function, so that it will exit quietly\n         when trying to re-initialize (uncomment the lines below).\n    */\n    function 
    initGovernance() internal {\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(!gub.initialized, 
    \"ALREADY_INITIALIZED\");\n        gub.initialized = true; // to ensure addGovernor() won\u0027t fail.\n        // Add the initial governer.\n     
       addGovernor(msg.sender);\n    }\n\n    function isGovernor(address testGovernor) internal view override returns (bool) {\n        
    GovernanceInfoStruct storage gub = getGovernanceInfo();\n        return gub.effectiveGovernors[testGovernor];\n    }\n\n    /*\n      Cancels the 
    nomination of a governor candidate.\n    */\n    function cancelNomination() internal onlyGovernance {\n        GovernanceInfoStruct storage gub = 
    getGovernanceInfo();\n        gub.candidateGovernor = address(0x0);\n        emit LogNominationCancelled();\n    }\n\n    function 
    nominateNewGovernor(address newGovernor) internal onlyGovernance {\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        
    require(!isGovernor(newGovernor), \"ALREADY_GOVERNOR\");\n        gub.candidateGovernor = newGovernor;\n        emit LogNominatedGovernor
    (newGovernor);\n    }\n\n    /*\n      The addGovernor is called in two cases:\n      1. by acceptGovernance when a new governor accepts its role
    .\n      2. by initGovernance to add the initial governor.\n      The difference is that the init path skips the nominate step\n      that would 
    fail because of the onlyGovernance modifier.\n    */\n    function addGovernor(address newGovernor) private {\n        require(!isGovernor
    (newGovernor), \"ALREADY_GOVERNOR\");\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        gub.effectiveGovernors[newGovernor] 
    = true;\n    }\n\n    function acceptGovernance() internal {\n        // The new governor was proposed as a candidate by the current governor.\n   
         GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(msg.sender == gub.candidateGovernor, \"ONLY_CANDIDATE_GOVERNOR\"
    );\n\n        // Update state.\n        addGovernor(gub.candidateGovernor);\n        gub.candidateGovernor = address(0x0);\n\n        // Send a 
    notification about the change of governor.\n        emit LogNewGovernorAccepted(msg.sender);\n    }\n\n    /*\n      Remove a governor from office
    .\n    */\n    function removeGovernor(address governorForRemoval) internal onlyGovernance {\n        require(msg.sender != governorForRemoval, 
    \"GOVERNOR_SELF_REMOVE\");\n        GovernanceInfoStruct storage gub = getGovernanceInfo();\n        require(isGovernor(governorForRemoval), 
    \"NOT_GOVERNOR\");\n        gub.effectiveGovernors[governorForRemoval] = false;\n        emit LogRemovedGovernor(governorForRemoval);\n    }\n}\n"}
    ,"GovernanceStorage.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the 
    \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www
    .starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is 
    distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific 
    language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\nimport 
    \"MGovernance.sol\";\n\n/*\n  Holds the governance slots for ALL entities, including proxy and the main contract.\n*/\ncontract GovernanceStorage 
    {\n    // A map from a Governor tag to its own GovernanceInfoStruct.\n    mapping(string =\u003e GovernanceInfoStruct) internal governanceInfo; 
    //NOLINT uninitialized-state.\n}\n"},"MGovernance.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under the 
    Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the 
    License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software 
    distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  
    See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0
    .\npragma solidity ^0.6.12;\n\nstruct GovernanceInfoStruct {\n    mapping(address =\u003e bool) effectiveGovernors;\n    address candidateGovernor
    ;\n    bool initialized;\n}\n\nabstract contract MGovernance {\n    function isGovernor(address testGovernor) internal view virtual returns (bool
    );\n\n    /*\n      Allows calling the function only by a Governor.\n    */\n    modifier onlyGovernance() {\n        require(isGovernor(msg.sender
    ), \"ONLY_GOVERNANCE\");\n        _;\n    }\n}\n"},"Proxy.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under 
    the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of 
    the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software 
    distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  
    See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0
    .\npragma solidity ^0.6.12;\n\nimport \"ProxyGovernance.sol\";\nimport \"ProxyStorage.sol\";\nimport \"StorageSlots.sol\";\nimport \"Common.sol\"
    ;\n\n/**\n  The Proxy contract implements delegation of calls to other contracts (`implementations`), with\n  proper forwarding of return values 
    and revert reasons. This pattern allows retaining the contract\n  storage while replacing implementation code.\n\n  The following operations are 
    supported by the proxy contract:\n\n  - :sol:func:`addImplementation`: Defines a new implementation, the data with which it should be initialized 
    and whether this will be the last version of implementation.\n  - :sol:func:`upgradeTo`: Once an implementation is added, the governor may upgrade 
    to that implementation only after a safety time period has passed (time lock), the current implementation is not the last version and the 
    implementation is not frozen (see :sol:mod:`FullWithdrawals`).\n  - :sol:func:`removeImplementation`: Any announced implementation may be removed. 
    Removing an implementation is especially important once it has been used for an upgrade in order to avoid an additional unwanted revert to an older 
    version.\n\n  The only entity allowed to perform the above operations is the proxy governor\n  (see :sol:mod:`ProxyGovernance`).\n\n  Every 
    implementation is required to have an `initialize` function that replaces the constructor\n  of a normal contract. Furthermore, the only parameter 
    of this function is an array of bytes\n  (`data`) which may be decoded arbitrarily by the `initialize` function. It is up to the\n  implementation 
    to ensure that this function cannot be run more than once if so desired.\n\n  When an implementation is added (:sol:func:`addImplementation`) the 
    initialization `data` is also\n  announced, allowing users of the contract to analyze the full effect of an upgrade to the new\n  implementation. 
    During an :sol:func:`upgradeTo`, the `data` is provided again and only if it is\n  identical to the announced `data` is the upgrade performed by 
    pointing the proxy to the new\n  implementation and calling its `initialize` function with this `data`.\n\n  It is the responsibility of the 
    implementation not to overwrite any storage belonging to the\n  proxy (`ProxyStorage`). In addition, upon upgrade, the new implementation is 
    assumed to be\n  backward compatible with previous implementations with respect to the storage used until that\n  point.\n*/\ncontract Proxy is 
    ProxyStorage, ProxyGovernance, StorageSlots {\n    // Emitted when the active implementation is replaced.\n    event ImplementationUpgraded(address 
    indexed implementation, bytes initializer);\n\n    // Emitted when an implementation is submitted as an upgrade candidate and a time lock\n    // 
    is activated.\n    event ImplementationAdded(address indexed implementation, bytes initializer, bool finalize);\n\n    // Emitted when an 
    implementation is removed from the list of upgrade candidates.\n    event ImplementationRemoved(address indexed implementation, bytes initializer, 
    bool finalize);\n\n    // Emitted when the implementation is finalized.\n    event FinalizedImplementation(address indexed implementation);\n\n    
    using Addresses for address;\n\n    string public constant PROXY_VERSION = \"3.0.0\";\n\n    constructor(uint256 upgradeActivationDelay) public {\n 
           initGovernance();\n        setUpgradeActivationDelay(upgradeActivationDelay);\n    }\n\n    function setUpgradeActivationDelay(uint256 
    delayInSeconds) private {\n        bytes32 slot = UPGRADE_DELAY_SLOT;\n        assembly {\n            sstore(slot, delayInSeconds)\n        }\n   
     }\n\n    function getUpgradeActivationDelay() public view returns (uint256 delay) {\n        bytes32 slot = UPGRADE_DELAY_SLOT;\n        assembly 
    {\n            delay := sload(slot)\n        }\n        return delay;\n    }\n\n    /*\n      Returns the address of the current implementation.\n 
       */\n    // NOLINTNEXTLINE external-function.\n    function implementation() public view returns (address _implementation) {\n        bytes32 
    slot = IMPLEMENTATION_SLOT;\n        assembly {\n            _implementation := sload(slot)\n        }\n    }\n\n    /*\n      Returns true if the 
    implementation is frozen.\n      If the implementation was not assigned yet, returns false.\n    */\n    function implementationIsFrozen() private 
    returns (bool) {\n        address _implementation = implementation();\n\n        // We can\u0027t call low level implementation before it\u0027s 
    assigned. (i.e. ZERO).\n        if (_implementation == address(0x0)) {\n            return false;\n        }\n\n        // NOLINTNEXTLINE: low
    -level-calls.\n        (bool success, bytes memory returndata) = _implementation.delegatecall(\n            abi.encodeWithSignature(\"isFrozen()\"
    )\n        );\n        require(success, string(returndata));\n        return abi.decode(returndata, (bool));\n    }\n\n    /*\n      This method 
    blocks delegation to initialize().\n      Only upgradeTo should be able to delegate call to initialize().\n    */\n    function initialize(\n      
      bytes calldata /*data*/\n    ) external pure {\n        revert(\"CANNOT_CALL_INITIALIZE\");\n    }\n\n    modifier notFinalized() {\n        
    require(isNotFinalized(), \"IMPLEMENTATION_FINALIZED\");\n        _;\n    }\n\n    /*\n      Forbids calling the function if the implementation is 
    frozen.\n      This modifier relies on the lower level (logical contract) implementation of isFrozen().\n    */\n    modifier notFrozen() {\n      
      require(!implementationIsFrozen(), \"STATE_IS_FROZEN\");\n        _;\n    }\n\n    /*\n      This entry point serves only transactions with empty 
    calldata. (i.e. pure value transfer tx).\n      We don\u0027t expect to receive such, thus block them.\n    */\n    receive() external payable {\n 
           revert(\"CONTRACT_NOT_EXPECTED_TO_RECEIVE\");\n    }\n\n    /*\n      Contract\u0027s default function. Delegates execution to the 
    implementation contract.\n      It returns back to the external caller whatever the implementation delegated code returns.\n    */\n    fallback() 
    external payable {\n        address _implementation = implementation();\n        require(_implementation != address(0x0), 
    \"MISSING_IMPLEMENTATION\");\n\n        assembly {\n            // Copy msg.data. We take full control of memory in this inline assembly\n         
       // block because it will not return to Solidity code. We overwrite the\n            // Solidity scratch pad at memory position 0.\n            
    calldatacopy(0, 0, calldatasize())\n\n            // Call the implementation.\n            // out and outsize are 0 for now, as we don\u0027t know 
    the out size yet.\n            let result := delegatecall(gas(), _implementation, 0, calldatasize(), 0, 0)\n\n            // Copy the returned data
    .\n            returndatacopy(0, 0, returndatasize())\n\n            switch result\n            // delegatecall returns 0 on error.\n            
    case 0 {\n                revert(0, returndatasize())\n            }\n            default {\n                return(0, returndatasize())\n         
       }\n        }\n    }\n\n    /*\n      Sets the implementation address of the proxy.\n    */\n    function setImplementation(address 
    newImplementation) private {\n        bytes32 slot = IMPLEMENTATION_SLOT;\n        assembly {\n            sstore(slot, newImplementation)\n       
     }\n    }\n\n    /*\n      Returns true if the contract is not in the finalized state.\n    */\n    function isNotFinalized() public view returns 
    (bool notFinal) {\n        bytes32 slot = FINALIZED_STATE_SLOT;\n        uint256 slotValue;\n        assembly {\n            slotValue := sload
    (slot)\n        }\n        notFinal = (slotValue == 0);\n    }\n\n    /*\n      Marks the current implementation as finalized.\n    */\n    
    function setFinalizedFlag() private {\n        bytes32 slot = FINALIZED_STATE_SLOT;\n        assembly {\n            sstore(slot, 0x1)\n        }\n 
       }\n\n    /*\n      Introduce an implementation and its initialization vector,\n      and start the time-lock before it can be upgraded to.\n    
      addImplementation is not blocked when frozen or finalized.\n      (upgradeTo API is blocked when finalized or frozen).\n    */\n    function 
    addImplementation(\n        address newImplementation,\n        bytes calldata data,\n        bool finalize\n    ) external onlyGovernance {\n     
       require(newImplementation.isContract(), \"ADDRESS_NOT_CONTRACT\");\n\n        bytes32 implVectorHash = keccak256(abi.encode(newImplementation, 
    data, finalize));\n\n        uint256 activationTime = block.timestamp + getUpgradeActivationDelay();\n\n        // First implementation should not 
    have time-lock.\n        if (implementation() == address(0x0)) {\n            activationTime = block.timestamp;\n        }\n\n        
    enabledTime[implVectorHash] = activationTime;\n        emit ImplementationAdded(newImplementation, data, finalize);\n    }\n\n    /*\n      Removes 
    a candidate implementation.\n      Note that it is possible to remove the current implementation. Doing so doesn\u0027t affect the\n      current 
    implementation, but rather revokes it as a future candidate.\n    */\n    function removeImplementation(\n        address removedImplementation,\n 
           bytes calldata data,\n        bool finalize\n    ) external onlyGovernance {\n        bytes32 implVectorHash = keccak256(abi.encode
    (removedImplementation, data, finalize));\n\n        // If we have initializer, we set the hash of it.\n        uint256 activationTime = 
    enabledTime[implVectorHash];\n        require(activationTime \u003e 0, \"UNKNOWN_UPGRADE_INFORMATION\");\n        delete 
    enabledTime[implVectorHash];\n        emit ImplementationRemoved(removedImplementation, data, finalize);\n    }\n\n    /*\n      Upgrades the proxy 
    to a new implementation, with its initialization.\n      to upgrade successfully, implementation must have been added time-lock agreeably\n      
    before, and the init vector must be identical ot the one submitted before.\n\n      Upon assignment of new implementation address,\n      its 
    initialize will be called with the initializing vector (even if empty).\n      Therefore, the implementation MUST must have such a method.\n\n     
     Note - Initialization data is committed to in advance, therefore it must remain valid\n      until the actual contract upgrade takes place.\n\n   
       Care should be taken regarding initialization data and flow when planning the contract upgrade.\n\n      When planning contract upgrade, special 
    care is also needed with regard to governance\n      (See comments in Governance.sol).\n    */\n    // NOLINTNEXTLINE: reentrancy-events timestamp
    .\n    function upgradeTo(\n        address newImplementation,\n        bytes calldata data,\n        bool finalize\n    ) external payable 
    onlyGovernance notFinalized notFrozen {\n        bytes32 implVectorHash = keccak256(abi.encode(newImplementation, data, finalize));\n        
    uint256 activationTime = enabledTime[implVectorHash];\n        require(activationTime \u003e 0, \"UNKNOWN_UPGRADE_INFORMATION\");\n        require
    (newImplementation.isContract(), \"ADDRESS_NOT_CONTRACT\");\n        // NOLINTNEXTLINE: timestamp.\n        require(activationTime \u003c= block
    .timestamp, \"UPGRADE_NOT_ENABLED_YET\");\n\n        setImplementation(newImplementation);\n\n        // NOLINTNEXTLINE: low-level-calls controlled
    -delegatecall.\n        (bool success, bytes memory returndata) = newImplementation.delegatecall(\n            abi.encodeWithSelector(this
    .initialize.selector, data)\n        );\n        require(success, string(returndata));\n\n        // Verify that the new implementation is not 
    frozen post initialization.\n        // NOLINTNEXTLINE: low-level-calls controlled-delegatecall.\n        (success, returndata) = newImplementation
    .delegatecall(\n            abi.encodeWithSignature(\"isFrozen()\")\n        );\n        require(success, \"CALL_TO_ISFROZEN_REVERTED\");\n        
    require(!abi.decode(returndata, (bool)), \"NEW_IMPLEMENTATION_FROZEN\");\n\n        if (finalize) {\n            setFinalizedFlag();\n            
    emit FinalizedImplementation(newImplementation);\n        }\n\n        emit ImplementationUpgraded(newImplementation, data);\n    }\n}\n"}
    ,"ProxyGovernance.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the 
    \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the License at\n\n  https://www
    .starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under the License is 
    distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License for the specific 
    language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12
    ;\n\nimport \"Governance.sol\";\nimport \"GovernanceStorage.sol\";\n\n/**\n  The Proxy contract is governed by one or more Governors of which the 
    initial one is the\n  deployer of the contract.\n\n  A governor has the sole authority to perform the following operations:\n\n  1. Nominate 
    additional governors (:sol:func:`proxyNominateNewGovernor`)\n  2. Remove other governors (:sol:func:`proxyRemoveGovernor`)\n  3. Add new 
    `implementations` (proxied contracts)\n  4. Remove (new or old) `implementations`\n  5. Update `implementations` after a timelock allows it\n\n  
    Adding governors is performed in a two step procedure:\n\n  1. First, an existing governor nominates a new governor (:sol:func
    :`proxyNominateNewGovernor`)\n  2. Then, the new governor must accept governance to become a governor (:sol:func:`proxyAcceptGovernance`)\n\n  This 
    two step procedure ensures that a governor public key cannot be nominated unless there is an\n  entity that has the corresponding private key. This 
    is intended to prevent errors in the addition\n  process.\n\n  The governor private key should typically be held in a secure cold wallet or managed 
    via a\n  multi-sig contract.\n*/\n/*\n  Implements Governance for the proxy contract.\n  It is a thin wrapper to the Governance contract,\n  which 
    is needed so that it can have non-colliding function names,\n  and a specific tag (key) to allow unique state storage.\n*/\ncontract 
    ProxyGovernance is GovernanceStorage, Governance {\n    // The tag is the string key that is used in the Governance storage mapping.\n    string 
    public constant PROXY_GOVERNANCE_TAG = \"StarkEx.Proxy.2019.GovernorsInformation\";\n\n    /*\n      Returns the GovernanceInfoStruct associated 
    with the governance tag.\n    */\n    function getGovernanceInfo() internal view override returns (GovernanceInfoStruct storage) {\n        return 
    governanceInfo[PROXY_GOVERNANCE_TAG];\n    }\n\n    function proxyIsGovernor(address testGovernor) external view returns (bool) {\n        return 
    isGovernor(testGovernor);\n    }\n\n    function proxyNominateNewGovernor(address newGovernor) external {\n        nominateNewGovernor(newGovernor
    );\n    }\n\n    function proxyRemoveGovernor(address governorForRemoval) external {\n        removeGovernor(governorForRemoval);\n    }\n\n    
    function proxyAcceptGovernance() external {\n        acceptGovernance();\n    }\n\n    function proxyCancelNomination() external {\n        
    cancelNomination();\n    }\n}\n"},"ProxyStorage.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare Industries Ltd.\n\n  Licensed under the Apache 
    License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the License.\n  You may obtain a copy of the License 
    at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or agreed to in writing,\n  software distributed under 
    the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n  See the License 
    for the specific language governing permissions\n  and limitations under the License.\n*/\n// SPDX-License-Identifier: Apache-2.0.\npragma solidity 
    ^0.6.12;\n\nimport \"GovernanceStorage.sol\";\n\n/*\n  Holds the Proxy-specific state variables.\n  This contract is inherited by the 
    GovernanceStorage (and indirectly by MainStorage)\n  to prevent collision hazard.\n*/\ncontract ProxyStorage is GovernanceStorage {\n    // 
    NOLINTNEXTLINE: naming-convention uninitialized-state.\n    mapping(address =\u003e bytes32) internal initializationHash_DEPRECATED;\n\n    // The 
    time after which we can switch to the implementation.\n    // Hash(implementation, data, finalize) =\u003e time.\n    mapping(bytes32 =\u003e 
    uint256) internal enabledTime;\n\n    // A central storage of the flags whether implementation has been initialized.\n    // Note - it can be used 
    flexibly enough to accommodate multiple levels of initialization\n    // (i.e. using different key salting schemes for different initialization 
    levels).\n    mapping(bytes32 =\u003e bool) internal initialized;\n}\n"},"StorageSlots.sol":{"content":"/*\n  Copyright 2019-2021 StarkWare 
    Industries Ltd.\n\n  Licensed under the Apache License, Version 2.0 (the \"License\").\n  You may not use this file except in compliance with the 
    License.\n  You may obtain a copy of the License at\n\n  https://www.starkware.co/open-source-license/\n\n  Unless required by applicable law or 
    agreed to in writing,\n  software distributed under the License is distributed on an \"AS IS\" BASIS,\n  WITHOUT WARRANTIES OR CONDITIONS OF ANY 
    KIND, either express or implied.\n  See the License for the specific language governing permissions\n  and limitations under the License.\n*/\n// 
    SPDX-License-Identifier: Apache-2.0.\npragma solidity ^0.6.12;\n\n/**\n  StorageSlots holds the arbitrary storage slots used throughout the Proxy 
    pattern.\n  Storage address slots are a mechanism to define an arbitrary location, that will not be\n  overlapped by the logical contracts.\n
    */\ncontract StorageSlots {\n    // Storage slot with the address of the current implementation.\n    // The address of the slot is keccak256
    (\"StarkWare2019.implemntation-slot\").\n    // We need to keep this variable stored outside of the commonly used space,\n    // so that it\u0027s 
    not overrun by the logical implementation (the proxied contract).\n    bytes32 internal constant IMPLEMENTATION_SLOT =\n        
    0x177667240aeeea7e35eabe3a35e18306f336219e1386f7710a6bf8783f761b24;\n\n    // Storage slot with the address of the call-proxy current 
    implementation.\n    // The address of the slot is keccak256(\"\u0027StarkWare2020.CallProxy.Implemntation.Slot\u0027\").\n    // We need to keep 
    this variable stored outside of the commonly used space.\n    // so that it\u0027s not overrun by the logical implementation (the proxied contract
    ).\n    bytes32 internal constant CALL_PROXY_IMPL_SLOT =\n        0x7184681641399eb4ad2fdb92114857ee6ff239f94ad635a1779978947b8843be;\n\n    // 
    This storage slot stores the finalization flag.\n    // Once the value stored in this slot is set to non-zero\n    // the proxy blocks 
    implementation upgrades.\n    // The current implementation is then referred to as Finalized.\n    // Web3.solidityKeccak([\u0027string\u0027], 
    [\"StarkWare2019.finalization-flag-slot\"]).\n    bytes32 internal constant FINALIZED_STATE_SLOT =\n        
    0x7d433c6f837e8f93009937c466c82efbb5ba621fae36886d0cac433c5d0aa7d2;\n\n    // Storage slot to hold the upgrade delay (time-lock).\n    // The 
    intention of this slot is to allow modification using an EIC.\n    // Web3.solidityKeccak([\u0027string\u0027], [\u0027StarkWare.Upgradibility
    .Delay.Slot\u0027]).\n    bytes32 public constant UPGRADE_DELAY_SLOT =\n        0xc21dbb3089fcb2c4f4c6a67854ab4db2b0f233ea4b21b21f912d52d18fc5db1f
    ;\n}\n"}}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
/*
  Copyright 2019-2023 StarkWare Industries Ltd.
  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  https://www.starkware.co/open-source-license/
  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
// SPDX-License-Identifier: Apache-2.0.
pragma solidity ^0.6.12;
/*
  Common Utility Libraries.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
/*
  Copyright 2019-2022 StarkWare Industries Ltd.
  Licensed under the Apache License, Version 2.0 (the "License").
  You may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  https://www.starkware.co/open-source-license/
  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions
  and limitations under the License.
*/
// SPDX-License-Identifier: Apache-2.0.
pragma solidity ^0.6.12;
/*
  Common Utility Libraries.
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX