nef: add Source field

Follow neo-project/neo#2605.

cli/contract_test.go

@@ -601,9 +601,9 @@ func TestCompileExamples(t *testing.T) {
 		})
 	}
 
-	t.Run("invalid events in manifest", func(t *testing.T) {
+	t.Run("invalid manifest", func(t *testing.T) {
 		const dir = "./testdata/"
-		for _, name := range []string{"invalid1", "invalid2", "invalid3"} {
+		for _, name := range []string{"invalid1", "invalid2", "invalid3", "invalid4"} {
 			outF := path.Join(tmpDir, name+".nef")
 			manifestF := path.Join(tmpDir, name+".manifest.json")
 			e.RunWithError(t, "neo-go", "contract", "compile",

cli/smartcontract/smart_contract.go

@@ -427,6 +427,7 @@ func initSmartContract(ctx *cli.Context) error {
 
 	m := ProjectConfig{
 		Name:               contractName,
+		SourceURL:          "http://example.com/",
 		SupportedStandards: []string{},
 		SafeMethods:        []string{},
 		Events: []manifest.Event{
@@ -489,6 +490,7 @@ func contractCompile(ctx *cli.Context) error {
 			return err
 		}
 		o.Name = conf.Name
+		o.SourceURL = conf.SourceURL
 		o.ContractEvents = conf.Events
 		o.ContractSupportedStandards = conf.SupportedStandards
 		o.Permissions = make([]manifest.Permission, len(conf.Permissions))
@@ -733,6 +735,7 @@ func testInvokeScript(ctx *cli.Context) error {
 // ProjectConfig contains project metadata.
 type ProjectConfig struct {
 	Name               string
+	SourceURL          string
 	SafeMethods        []string
 	SupportedStandards []string
 	Events             []manifest.Event

cli/smartcontract/smart_contract_test.go

@@ -59,6 +59,7 @@ func RuntimeNotify(args []interface{}) {
 	require.NoError(t, err)
 	require.Equal(t,
 		`name: testContract
+sourceurl: http://example.com/
 safemethods: []
 supportedstandards: []
 events:

cli/testdata/invalid4/invalid.go

@@ -0,0 +1,5 @@
+package invalid4
+
+func Verify() bool {
+	return true
+}

cli/testdata/invalid4/invalid.yml

@@ -0,0 +1,2 @@
+name: Test bad source url
+sourceurl: http://example.com/with/some/huge/path/that/cant/be/ever/normally/reached/but/we/need/to/test/for/it/anyway/because/there/is/some/path/in/the/code/that/does/this/check/and/it/should/be/triggered/to/ensure/proper/coverage/in/this/particular/component/of/our/perfect/compiler

examples/engine/engine.yml

@@ -1,4 +1,5 @@
 name: "Engine example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events:
   - name: Tx

examples/events/events.yml

@@ -1,4 +1,5 @@
 name: "Event types example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events:
   - name: SomeBytes

examples/iterator/iterator.yml

@@ -1,4 +1,5 @@
 name: "Iterator example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events:
   - name: found storage key-value pair

examples/nft-nd-nns/nns.yml

@@ -1,4 +1,5 @@
 name: "NameService"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: ["NEP-11"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply", "tokensOf", "ownerOf",
               "tokens", "properties", "roots", "getPrice", "isAvailable", "getRecord",

examples/nft-nd/nft.yml

@@ -1,4 +1,5 @@
 name: "HASHY NFT"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: ["NEP-11"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply", "tokensOf", "ownerOf", "tokens", "properties"]
 events:

examples/oracle/oracle.yml

@@ -1,4 +1,5 @@
 name: "Oracle example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events:
 permissions:

examples/runtime/runtime.yml

@@ -1,4 +1,5 @@
 name: "Runtime example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events:
   - name: Event

examples/storage/storage.yml

@@ -1,3 +1,4 @@
 name: "Storage example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events: []

examples/timer/timer.yml

@@ -1,4 +1,5 @@
 name: "Timer example"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: []
 events: []
 permissions:

examples/token-sale/token_sale.yml

@@ -1,4 +1,5 @@
 name: "My awesome token"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: ["NEP-17"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply"]
 events:

examples/token/token.yml

@@ -1,4 +1,5 @@
 name: "Awesome NEO Token"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: ["NEP-17"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply"]
 events:

pkg/compiler/compiler.go

@@ -52,6 +52,9 @@ type Options struct {
 	// Name is contract's name to be written to manifest.
 	Name string
 
+	// SourceURL is contract's source URL to be written to manifest.
+	SourceURL string
+
 	// Runtime notifications.
 	ContractEvents []manifest.Event
 
@@ -199,6 +202,13 @@ func CompileAndSave(src string, o *Options) ([]byte, error) {
 	if err != nil {
 		return nil, fmt.Errorf("error while trying to create .nef file: %w", err)
 	}
+	if o.SourceURL != "" {
+		if len(o.SourceURL) > nef.MaxSourceURLLength {
+			return nil, errors.New("too long source URL")
+		}
+		f.Source = o.SourceURL
+		f.Checksum = f.CalculateChecksum()
+	}
 	bytes, err := f.Bytes()
 	if err != nil {
 		return nil, fmt.Errorf("error while serializing .nef file: %w", err)

pkg/rpc/server/testdata/test_contract.yml

@@ -1,4 +1,5 @@
 name: "Rubl"
+sourceurl: https://github.com/nspcc-dev/neo-go/
 supportedstandards: ["NEP-17"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply"]
 events:

pkg/smartcontract/nef/nef.go

@@ -18,8 +18,9 @@ import (
 // +------------+-----------+------------------------------------------------------------+
 // | Magic      | 4 bytes   | Magic header                                               |
 // | Compiler   | 64 bytes  | Compiler used and it's version                             |
+// | Source     | Var bytes | Source file URL.                                           |
 // +------------+-----------+------------------------------------------------------------+
-// | Reserved   | 2-bytes   | Reserved for extensions. Must be 0.                        |
+// | Reserved   | 1 byte    | Reserved for extensions. Must be 0.                        |
 // | Tokens     | Var array | List of method tokens                                      |
 // | Reserved   | 2-bytes   | Reserved for extensions. Must be 0.                        |
 // | Script     | Var bytes | Var bytes for the payload                                  |
@@ -32,6 +33,8 @@ const (
 	Magic uint32 = 0x3346454E
 	// MaxScriptLength is the maximum allowed contract script length.
 	MaxScriptLength = 512 * 1024
+	// MaxSourceURLLength is the maximum allowed source URL length.
+	MaxSourceURLLength = 256
 	// compilerFieldSize is the length of `Compiler` File header field in bytes.
 	compilerFieldSize = 64
 )
@@ -39,6 +42,7 @@ const (
 // File represents compiled contract file structure according to the NEF3 standard.
 type File struct {
 	Header
+	Source   string        `json:"source"`
 	Tokens   []MethodToken `json:"tokens"`
 	Script   []byte        `json:"script"`
 	Checksum uint32        `json:"checksum"`
@@ -106,7 +110,12 @@ func (n *File) CalculateChecksum() uint32 {
 // EncodeBinary implements io.Serializable interface.
 func (n *File) EncodeBinary(w *io.BinWriter) {
 	n.Header.EncodeBinary(w)
-	w.WriteU16LE(0)
+	if len(n.Source) > MaxSourceURLLength {
+		w.Err = errors.New("source url too long")
+		return
+	}
+	w.WriteString(n.Source)
+	w.WriteB(0)
 	w.WriteArray(n.Tokens)
 	w.WriteU16LE(0)
 	w.WriteVarBytes(n.Script)
@@ -118,13 +127,14 @@ var errInvalidReserved = errors.New("reserved bytes must be 0")
 // DecodeBinary implements io.Serializable interface.
 func (n *File) DecodeBinary(r *io.BinReader) {
 	n.Header.DecodeBinary(r)
-	reserved := r.ReadU16LE()
-	if r.Err == nil && reserved != 0 {
+	n.Source = r.ReadString(MaxSourceURLLength)
+	reservedB := r.ReadB()
+	if r.Err == nil && reservedB != 0 {
 		r.Err = errInvalidReserved
 		return
 	}
 	r.ReadArray(&n.Tokens)
-	reserved = r.ReadU16LE()
+	reserved := r.ReadU16LE()
 	if r.Err == nil && reserved != 0 {
 		r.Err = errInvalidReserved
 		return

pkg/smartcontract/nef/nef_test.go

@@ -149,6 +149,7 @@ func TestMarshalUnmarshalJSON(t *testing.T) {
 	require.JSONEq(t, `{
 		"magic":`+strconv.FormatUint(uint64(Magic), 10)+`,
 		"compiler": "test.compiler-test.ver",
+		"source": "",
 		"tokens": [
 			{
 	"hash": "0x`+expected.Tokens[0].Hash.StringLE()+`",