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authorFabio Berger <me@fabioberger.com>2018-06-19 23:25:08 +0800
committerFabio Berger <me@fabioberger.com>2018-06-19 23:25:08 +0800
commit1a0b9e46120dd32b3df3bca5076b26ed8a9c932b (patch)
tree52cd30674372f6b63f2e50836cdb3560241acf30 /packages/contracts/src/utils
parent6641f34d76951273a0efa909d4abed72ab8b3472 (diff)
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Comments and cleanup
Diffstat (limited to 'packages/contracts/src/utils')
-rw-r--r--packages/contracts/src/utils/asset_wrapper.ts28
1 files changed, 8 insertions, 20 deletions
diff --git a/packages/contracts/src/utils/asset_wrapper.ts b/packages/contracts/src/utils/asset_wrapper.ts
index 462a5086a..2eb54f290 100644
--- a/packages/contracts/src/utils/asset_wrapper.ts
+++ b/packages/contracts/src/utils/asset_wrapper.ts
@@ -12,6 +12,10 @@ interface ProxyIdToAssetWrappers {
[proxyId: number]: AbstractAssetWrapper;
}
+/**
+ * This class abstracts away the differences between ERC20 and ERC721 tokens so that
+ * the logic that uses it does not need to care what standard a token belongs to.
+ */
export class AssetWrapper {
private _proxyIdToAssetWrappers: ProxyIdToAssetWrappers;
constructor(assetWrappers: AbstractAssetWrapper[]) {
@@ -29,7 +33,6 @@ export class AssetWrapper {
const balance = await assetWrapper.getBalanceAsync(userAddress, assetData);
return balance;
}
-
case constants.ERC721_PROXY_ID: {
const assetWrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
const assetProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
@@ -41,7 +44,6 @@ export class AssetWrapper {
const balance = isOwner ? new BigNumber(1) : new BigNumber(0);
return balance;
}
-
default:
throw errorUtils.spawnSwitchErr('proxyId', proxyId);
}
@@ -54,7 +56,6 @@ export class AssetWrapper {
await assetWrapper.setBalanceAsync(userAddress, assetData, desiredBalance);
return;
}
-
case constants.ERC721_PROXY_ID: {
if (!desiredBalance.eq(0) && !desiredBalance.eq(1)) {
throw new Error(`Balance for ERC721 token can only be set to 0 or 1. Got: ${desiredBalance}`);
@@ -82,11 +83,6 @@ export class AssetWrapper {
tokenOwner,
userAddress,
);
- } else if (
- (userAddress !== tokenOwner && desiredBalance.eq(0)) ||
- (tokenOwner === userAddress && desiredBalance.eq(1))
- ) {
- return; // noop
} else if (tokenOwner === userAddress && desiredBalance.eq(0)) {
// Burn token
await erc721Wrapper.burnAsync(assetProxyData.tokenAddress, assetProxyData.tokenId, userAddress);
@@ -94,7 +90,6 @@ export class AssetWrapper {
}
break;
}
-
default:
throw errorUtils.spawnSwitchErr('proxyId', proxyId);
}
@@ -107,7 +102,6 @@ export class AssetWrapper {
const allowance = await assetWrapper.getProxyAllowanceAsync(userAddress, assetData);
return allowance;
}
-
case constants.ERC721_PROXY_ID: {
const assetWrapper = this._proxyIdToAssetWrappers[proxyId] as ERC721Wrapper;
const erc721ProxyData = assetProxyUtils.decodeERC721AssetData(assetData);
@@ -123,7 +117,6 @@ export class AssetWrapper {
const allowance = isProxyApproved || isProxyApprovedForAllAsync ? new BigNumber(1) : new BigNumber(0);
return allowance;
}
-
default:
throw errorUtils.spawnSwitchErr('proxyId', proxyId);
}
@@ -140,7 +133,6 @@ export class AssetWrapper {
await assetWrapper.setAllowanceAsync(userAddress, assetData, desiredAllowance);
return;
}
-
case constants.ERC721_PROXY_ID: {
if (!desiredAllowance.eq(0) && !desiredAllowance.eq(1)) {
throw new Error(`Allowance for ERC721 token can only be set to 0 or 1. Got: ${desiredAllowance}`);
@@ -164,8 +156,9 @@ export class AssetWrapper {
assetProxyData.tokenAddress,
assetProxyData.tokenId,
);
- // TODO: We should have a way to deal with this. Things get hairier once we are testing
- // batch fills
+ // HACK: We do not currently support ApprovedForAll when setting proxy allowance
+ // This was intentional since unsetting ApprovedForAll, will unset approval for unrelated
+ // tokens other then the one specified in the call to this method.
if (isProxyApprovedForAll) {
throw new Error(`We don't currently support the use of "approveAll" functionality for ERC721.`);
}
@@ -177,21 +170,16 @@ export class AssetWrapper {
if (!isProxyApproved && desiredAllowance.eq(1)) {
await erc721Wrapper.approveProxyAsync(assetProxyData.tokenAddress, assetProxyData.tokenId);
} else if (isProxyApproved && desiredAllowance.eq(0)) {
+ // Remove approval
await erc721Wrapper.approveAsync(
constants.NULL_ADDRESS,
assetProxyData.tokenAddress,
assetProxyData.tokenId,
);
- } else if (
- (!isProxyApproved && desiredAllowance.eq(0)) ||
- (isProxyApproved && desiredAllowance.eq(1))
- ) {
- return; // noop
}
break;
}
-
default:
throw errorUtils.spawnSwitchErr('proxyId', proxyId);
}