chore: generate openzeppelin go bindings from sources

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "contracts/lib/openzeppelin-contracts"]
 	path = contracts/lib/openzeppelin-contracts
 	url = https://github.com/OpenZeppelin/openzeppelin-contracts
+[submodule "contracts/lib/openzeppelin-contracts-v3.4.1-solc-0.7-2"]
+	path = contracts/lib/openzeppelin-contracts-v3.4.1-solc-0.7-2
+	url = https://github.com/OpenZeppelin/openzeppelin-contracts

contracts/Makefile

@@ -8,14 +8,32 @@ gen:
 	$(call gen_go_binding,Swapper,src/tokens/Swapper,tokens,src/tokens)
 	$(call gen_go_binding,WETH9,src/tokens/WETH9,tokens,src/tokens)
 
-# Generate go binding.
+test:
+	$(call gen_go_binding_from_lib,openzeppelin-contracts-v3.4.1-solc-0.7-2,ProxyAdmin,src/openzeppelin/ProxyAdmin,openzeppelin,src/openzeppelin)
+	$(call gen_go_binding_from_lib,openzeppelin-contracts-v3.4.1-solc-0.7-2,TransparentUpgradeableProxy,src/openzeppelin/TransparentUpgradeableProxy,openzeppelin,src/openzeppelin)
+
+# Generate simple go bindings.
 # - $1: smart contract name.
 # - $2: smart contract folder path.
 # - $3: go package name.
 # - $4: go file output path.
 define gen_go_binding
-	echo "Generating ABI, bytecode and go bindings for $1..."
+	echo "Generating ABI, bytecode and go binding for $1..."
 	cat ./out/$1.sol/$1.json | jq -r '.abi' 						> ./$2/$1.abi
 	cat ./out/$1.sol/$1.json | jq -r '.bytecode.object' > ./$2/$1.bin
 	abigen --abi ./$2/$1.abi --bin ./$2/$1.bin --pkg $3 --type $1 --out ./$4/$1.go
 endef
+
+# Generate go bindings for smart contracts under `lib/`.
+# - $1: library name.
+# - $2: smart contract name.
+# - $3: smart contract folder path.
+# - $4: go package name.
+# - $5: go file output path.
+define gen_go_binding_from_lib
+	echo "Generating ABI, bytecode and go binding for $2..."
+	cd "./lib/$1" && forge build
+	cat "./lib/$1/out/$2.sol/$2.json" | jq -r '.abi' 						 > "./$3/$2.abi"
+	cat "./lib/$1/out/$2.sol/$2.json" | jq -r '.bytecode.object' > "./$3/$2.bin"
+	abigen --abi "./$3/$2.abi" --bin "./$3/$2.bin" --pkg $4 --type $2 --out ./$5/$2.go
+endef