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Add ERC20 allowance (approve) support in internal ERC20 plugin

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This commit is contained in:
TamtamHero
2020-09-24 17:02:57 +02:00
parent 193ff80cfc
commit 6a754b5189
3 changed files with 166 additions and 16 deletions
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169
src_plugins/erc20/erc20_plugin.c
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@@ -1,20 +1,86 @@
#include <string.h>
#include "eth_plugin_interface.h"
#include "eth_plugin_internal.h"
#include "eth_plugin_handler.h"
#include "shared_context.h"
#include "ethUtils.h"
#include "utils.h"
typedef enum {
ERC20_TRANSFER = 0,
ERC20_APPROVE
} erc20Selector_t;
typedef enum {
TARGET_ADDRESS = 0,
TARGET_CONTRACT,
TARGET_COMPOUND
} targetType_t;
typedef struct erc20_parameters_t {
uint8_t destinationAddress[20];
uint8_t selectorIndex;
uint8_t destinationAddress[21];
uint8_t amount[32];
uint8_t ticker_1[MAX_TICKER_LEN];
uint8_t ticker_2[MAX_TICKER_LEN];
uint8_t decimals;
uint8_t target;
} erc20_parameters_t;
typedef struct ticker_binding_t {
char ticker1[MAX_TICKER_LEN];
char ticker2[MAX_TICKER_LEN];
} ticker_binding_t;
#define NUM_COMPOUND_BINDINGS 9
const ticker_binding_t const COMPOUND_BINDINGS[NUM_COMPOUND_BINDINGS] = {
{"DAI", "CDAI"},
{"WETH", "CETH"},
{"USDC", "CUSDC"},
{"ZRX", "CZRX"},
{"USDT", "CUSDT"},
{"WBTC", "CBTC"},
{"BAT", "CBAT"},
{"REPv2", "CREP"},
{"SAI", "CSAI"},
};
bool check_token_binding(char* ticker1, char* ticker2, const ticker_binding_t* bindings, size_t num_bindings){
for(size_t i = 0; i < num_bindings; i++){
ticker_binding_t* binding = (ticker_binding_t *)PIC(&bindings[i]);
if (strncmp(binding->ticker1, ticker1, strnlen(binding->ticker1, MAX_TICKER_LEN)) == 0 &&
strncmp(binding->ticker2, ticker2, strnlen(binding->ticker2, MAX_TICKER_LEN)) == 0){
return true;
}
}
return false;
}
void erc20_plugin_call(int message, void *parameters) {
switch(message) {
case ETH_PLUGIN_INIT_CONTRACT: {
ethPluginInitContract_t *msg = (ethPluginInitContract_t*)parameters;
PRINTF("erc20 plugin init\n");
msg->result = ETH_PLUGIN_RESULT_OK;
erc20_parameters_t *context = (erc20_parameters_t*)msg->pluginContext;
// enforce that ETH amount should be 0
if (!allzeroes(msg->pluginSharedRO->txContent->value.value, 32)){
PRINTF("Err: Transaction amount is not 0\n");
msg->result = ETH_PLUGIN_RESULT_ERROR;
}
else {
size_t i;
for (i=0; i<NUM_ERC20_SELECTORS; i++) {
if (memcmp((uint8_t *)PIC(ERC20_SELECTORS[i]), msg->selector, SELECTOR_SIZE) == 0) {
context->selectorIndex = i;
break;
}
}
if (i == NUM_ERC20_SELECTORS) {
PRINTF("Unknown selector %.*H\n", SELECTOR_SIZE, msg->selector);
break;
}
PRINTF("erc20 plugin init\n");
msg->result = ETH_PLUGIN_RESULT_OK;
}
}
break;
@@ -42,18 +108,95 @@ void erc20_plugin_call(int message, void *parameters) {
ethPluginFinalize_t *msg = (ethPluginFinalize_t*)parameters;
erc20_parameters_t *context = (erc20_parameters_t*)msg->pluginContext;
PRINTF("erc20 plugin finalize\n");
msg->tokenLookup1 = msg->pluginSharedRO->txContent->destination;
msg->amount = context->amount;
msg->address = context->destinationAddress;
msg->uiType = ETH_UI_TYPE_AMOUNT_ADDRESS;
msg->result = ETH_PLUGIN_RESULT_OK;
if (context->selectorIndex == ERC20_TRANSFER){
msg->tokenLookup1 = msg->pluginSharedRO->txContent->destination;
msg->amount = context->amount;
msg->address = context->destinationAddress;
msg->uiType = ETH_UI_TYPE_AMOUNT_ADDRESS;
msg->result = ETH_PLUGIN_RESULT_OK;
}
else if (context->selectorIndex == ERC20_APPROVE){
msg->tokenLookup1 = msg->pluginSharedRO->txContent->destination;
msg->tokenLookup2 = context->destinationAddress;
msg->numScreens = 2;
msg->uiType = ETH_UI_TYPE_GENERIC;
msg->result = ETH_PLUGIN_RESULT_OK;
}
}
break;
case ETH_PLUGIN_PROVIDE_TOKEN: {
ethPluginProvideToken_t *msg = (ethPluginProvideToken_t*)parameters;
PRINTF("erc20 plugin provide token %d\n", (msg->token1 != NULL));
msg->result = (msg->token1 != NULL ? ETH_PLUGIN_RESULT_OK : ETH_PLUGIN_RESULT_FALLBACK);
erc20_parameters_t *context = (erc20_parameters_t*)msg->pluginContext;
PRINTF("erc20 plugin provide token 1: %d - 2: %d\n", (msg->token1 != NULL), (msg->token2 != NULL));
if (msg->token1 != NULL) {
context->target = TARGET_ADDRESS;
strcpy((char *)context->ticker_1, (char *)msg->token1->ticker);
context->decimals = msg->token1->decimals;
if (context->selectorIndex == ERC20_APPROVE){
if(msg->token2 != NULL){
context->target = TARGET_CONTRACT;
strcpy((char *)context->ticker_2, (char *)msg->token2->ticker);
// test if we're doing a Compound allowance
if (check_token_binding((char *)msg->token1->ticker, (char *)msg->token2->ticker, COMPOUND_BINDINGS, NUM_COMPOUND_BINDINGS)){
context->target = TARGET_COMPOUND;
}
}
}
msg->result = ETH_PLUGIN_RESULT_OK;
}
else {
msg->result = ETH_PLUGIN_RESULT_FALLBACK;
}
}
break;
case ETH_PLUGIN_QUERY_CONTRACT_ID: {
ethQueryContractID_t *msg = (ethQueryContractID_t*)parameters;
strcpy(msg->name, "Approve");
strcpy(msg->version, "");
msg->result = ETH_PLUGIN_RESULT_OK;
}
break;
case ETH_PLUGIN_QUERY_CONTRACT_UI: {
ethQueryContractUI_t *msg = (ethQueryContractUI_t*)parameters;
erc20_parameters_t *context = (erc20_parameters_t*)msg->pluginContext;
switch(msg->screenIndex) {
case 0:
strcpy(msg->title, "Amount");
if(ismaxint(context->amount, sizeof(context->amount))){
strcpy(msg->msg, "Unlimited ");
strcat(msg->msg, (char *)context->ticker_1);
}
else{
amountToString(context->amount, sizeof(context->amount), context->decimals, (char *)context->ticker_1, msg->msg, 100);
}
msg->result = ETH_PLUGIN_RESULT_OK;
break;
case 1:
if(context->target >= TARGET_CONTRACT){
strcpy(msg->title, "Contract");
if (context->target == TARGET_COMPOUND){
strcpy(msg->msg, "Compound ");
strcat(msg->msg, (char *)context->ticker_2 + 1); // remove the 'c' char at beginning of compound ticker
}
else {
strcpy(msg->msg, (char *)context->ticker_2);
}
}
else{
strcpy(msg->title, "Address");
msg->msg[0] = '0';
msg->msg[1] = 'x';
getEthAddressStringFromBinary(context->destinationAddress, (uint8_t *)msg->msg + 2, msg->pluginSharedRW->sha3, chainConfig);
}
msg->result = ETH_PLUGIN_RESULT_OK;
break;
default:
break;
}
}
break;