path: root/signer/fourbyte/fourbyte_test.go

// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package fourbyte

import (
    "fmt"
    "io/ioutil"
    "strings"
    "testing"

    "github.com/ethereum/go-ethereum/accounts/abi"
    "github.com/ethereum/go-ethereum/common"
)

// Tests that all the selectors contained in the 4byte database are valid.
func TestEmbeddedDatabase(t *testing.T) {
    db, err := New()
    if err != nil {
        t.Fatal(err)
    }
    for id, selector := range db.embedded {
        abistring, err := parseSelector(selector)
        if err != nil {
            t.Errorf("Failed to convert selector to ABI: %v", err)
            continue
        }
        abistruct, err := abi.JSON(strings.NewReader(string(abistring)))
        if err != nil {
            t.Errorf("Failed to parse ABI: %v", err)
            continue
        }
        m, err := abistruct.MethodById(common.Hex2Bytes(id))
        if err != nil {
            t.Errorf("Failed to get method by id (%s): %v", id, err)
            continue
        }
        if m.Sig() != selector {
            t.Errorf("Selector mismatch: have %v, want %v", m.Sig(), selector)
        }
    }
}

// Tests that custom 4byte datasets can be handled too.
func TestCustomDatabase(t *testing.T) {
    // Create a new custom 4byte database with no embedded component
    tmpdir, err := ioutil.TempDir("", "signer-4byte-test")
    if err != nil {
        t.Fatal(err)
    }
    filename := fmt.Sprintf("%s/4byte_custom.json", tmpdir)

    db, err := NewWithFile(filename)
    if err != nil {
        t.Fatal(err)
    }
    db.embedded = make(map[string]string)

    // Ensure the database is empty, insert and verify
    calldata := common.Hex2Bytes("a52c101edeadbeef")
    if _, err = db.Selector(calldata); err == nil {
        t.Fatalf("Should not find a match on empty database")
    }
    if err = db.AddSelector("send(uint256)", calldata); err != nil {
        t.Fatalf("Failed to save file: %v", err)
    }
    if _, err = db.Selector(calldata); err != nil {
        t.Fatalf("Failed to find a match for abi signature: %v", err)
    }
    // Check that the file as persisted to disk by creating a new instance
    db2, err := NewFromFile(filename)
    if err != nil {
        t.Fatalf("Failed to create new abidb: %v", err)
    }
    if _, err = db2.Selector(calldata); err != nil {
        t.Fatalf("Failed to find a match for persisted abi signature: %v", err)
    }
}