app-ethereum/src_common/eth_plugin_interface.h

// clang-format off

#ifndef _ETH_PLUGIN_INTERFACE_H_
#define _ETH_PLUGIN_INTERFACE_H_

#include "os.h"
#include "cx.h"
#include "asset_info.h"
#include "tx_content.h"

/*************************************************************************************************
 * Comments provided in this file are quick reminders on the usage of the plugin interface       *
 * Reading the real plugin documentation is GREATLY recommended.                                 *
 * You can find the latest version here:                                                         *
 * https://github.com/LedgerHQ/app-ethereum/blob/develop/doc/ethapp_plugins.adoc                 *
 *************************************************************************************************/

// Interface version. Will be updated every time a breaking change in the interface is introduced.
typedef enum eth_plugin_interface_version_e {
    ETH_PLUGIN_INTERFACE_VERSION_1 = 1,
    ETH_PLUGIN_INTERFACE_VERSION_2 = 2,
    ETH_PLUGIN_INTERFACE_VERSION_3 = 3,
    ETH_PLUGIN_INTERFACE_VERSION_4 = 4,
    ETH_PLUGIN_INTERFACE_VERSION_5 = 5,
    ETH_PLUGIN_INTERFACE_VERSION_LATEST = 6,
} eth_plugin_interface_version_t;


// Codes for the different requests Ethereum can send to the plugin
// The dispatch is handled by the SDK itself, the plugin code does not have to handle it
typedef enum eth_plugin_msg_e {
    // Codes for actions the Ethereum app can ask the plugin to perform
    ETH_PLUGIN_INIT_CONTRACT = 0x0101,
    ETH_PLUGIN_PROVIDE_PARAMETER = 0x0102,
    ETH_PLUGIN_FINALIZE = 0x0103,
    ETH_PLUGIN_PROVIDE_INFO = 0x0104,
    ETH_PLUGIN_QUERY_CONTRACT_ID = 0x0105,
    ETH_PLUGIN_QUERY_CONTRACT_UI = 0x0106,

    // Special request: the Ethereum app is checking if we are installed on the device
    ETH_PLUGIN_CHECK_PRESENCE = 0x01FF,
} eth_plugin_msg_t;


// Reply codes when responding to the Ethereum application
typedef enum eth_plugin_result_e {
    // Unsuccessful return values
    ETH_PLUGIN_RESULT_ERROR = 0x00,
    ETH_PLUGIN_RESULT_UNAVAILABLE = 0x01,
    ETH_PLUGIN_RESULT_UNSUCCESSFUL = 0x02,  // Used for comparison

    // Successful return values
    ETH_PLUGIN_RESULT_SUCCESSFUL = 0x03,  // Used for comparison
    ETH_PLUGIN_RESULT_OK = 0x04,
    ETH_PLUGIN_RESULT_OK_ALIAS = 0x05,
    ETH_PLUGIN_RESULT_FALLBACK = 0x06,
} eth_plugin_result_t;


// Format of UI the Ethereum application has to use for this plugin
typedef enum eth_ui_type_e {
    // If uiType is UI_AMOUNT_ADDRESS, Ethereum will use the amount/address UI
    // the amount and address provided by the plugin will be used
    // If tokenLookup1 is set, the amount is provided for this token
    ETH_UI_TYPE_AMOUNT_ADDRESS = 0x01,

    // If uiType is UI_TYPE_GENERIC, Ethereum will use the dedicated ETH plugin UI
    // the ETH application provides tokens if requested then prompts for each UI field
    // The first field is forced by the ETH app to be the name + version of the plugin handling the
    // request. The last field is the fee amount
    ETH_UI_TYPE_GENERIC = 0x02,
} eth_ui_type_t;


// Scratch objects and utilities available to the plugin READ-WRITE
typedef struct ethPluginSharedRW_s {
    cx_sha3_t *sha3;
} ethPluginSharedRW_t;


// Transaction data available to the plugin READ-ONLY
typedef struct ethPluginSharedRO_s {
    txContent_t *txContent;
} ethPluginSharedRO_t;


// Plugin-only memory allocated by the Ethereum application and used by the plugin.
#define PLUGIN_CONTEXT_SIZE (5 * INT256_LENGTH)
// It is recommended to cast the raw uin8_t array to a structure meaningfull for your plugin
// Helper to check that the actual plugin context structure is not bigger than the allocated memory
#define ASSERT_SIZEOF_PLUGIN_CONTEXT(s) \
    _Static_assert(sizeof(s) <= PLUGIN_CONTEXT_SIZE, "Plugin context structure is too big.")


/*
 * HANDLERS AND PARAMETERS
 * Parameters associated with the requests the Ethereum application can ask the plugin to perform
 * The plugin SDK will automatically call the relevant handler for the received code, so the plugin
 * has to define each of the handler functions declared below.
 */


// Init Contract

typedef struct ethPluginInitContract_s {
    eth_plugin_interface_version_t interfaceVersion;
    eth_plugin_result_t result;

    // in
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    uint8_t *pluginContext;
    size_t pluginContextLength;
    const uint8_t *selector;  // 4 bytes selector
    size_t dataSize;

    char *alias;  // 29 bytes alias if ETH_PLUGIN_RESULT_OK_ALIAS set

} ethPluginInitContract_t;
// void handle_init_contract(ethPluginInitContract_t *parameters);


// Provide parameter

typedef struct ethPluginProvideParameter_s {
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    uint8_t *pluginContext; // PLUGIN_CONTEXT_SIZE
    const uint8_t *parameter;  // 32 bytes parameter
    uint32_t parameterOffset;

    eth_plugin_result_t result;

} ethPluginProvideParameter_t;
// void handle_provide_parameter(ethPluginProvideParameter_t *parameters);


// Finalize

typedef struct ethPluginFinalize_s {
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    uint8_t *pluginContext; // PLUGIN_CONTEXT_SIZE

    uint8_t *tokenLookup1;  // set by the plugin if a token should be looked up
    uint8_t *tokenLookup2;

    const uint8_t *amount;   // set an uint256 pointer if uiType is UI_AMOUNT_ADDRESS
    const uint8_t *address;  // set to the destination address if uiType is UI_AMOUNT_ADDRESS. Set
                             // to the user's address if uiType is UI_TYPE_GENERIC

    eth_ui_type_t uiType;
    uint8_t numScreens;  // ignored if uiType is UI_AMOUNT_ADDRESS
    eth_plugin_result_t result;

} ethPluginFinalize_t;
// void handle_finalize(ethPluginFinalize_t *parameters);


// Provide token

typedef struct ethPluginProvideInfo_s {
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    uint8_t *pluginContext; // PLUGIN_CONTEXT_SIZE

    union extraInfo_t *item1;  // set by the ETH application, to be saved by the plugin
    union extraInfo_t *item2;

    uint8_t additionalScreens;  // Used by the plugin if it needs to display additional screens
                                // based on the information received from the token definitions.

    eth_plugin_result_t result;

} ethPluginProvideInfo_t;
// void handle_provide_token(ethPluginProvideInfo_t *parameters);


// Query Contract name and version

// This is always called on the non aliased contract

typedef struct ethQueryContractID_s {
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    uint8_t *pluginContext; // PLUGIN_CONTEXT_SIZE

    char *name;
    size_t nameLength;
    char *version;
    size_t versionLength;

    eth_plugin_result_t result;

} ethQueryContractID_t;
// void handle_query_contract_id(ethQueryContractID_t *parameters);


// Query Contract UI

typedef struct ethQueryContractUI_s {
    ethPluginSharedRW_t *pluginSharedRW;
    ethPluginSharedRO_t *pluginSharedRO;
    union extraInfo_t *item1;
    union extraInfo_t *item2;
    char network_ticker[MAX_TICKER_LEN];
    uint8_t *pluginContext; // PLUGIN_CONTEXT_SIZE
    uint8_t screenIndex;

    char *title;
    size_t titleLength;
    char *msg;
    size_t msgLength;

    eth_plugin_result_t result;

} ethQueryContractUI_t;
// void handle_query_contract_ui(ethQueryContractUI_t *parameters);

#endif  // _ETH_PLUGIN_INTERFACE_H_

// clang-format on