feat(goctl): api dart support flutter v2 (#1603)

0. support null-safety code gen
1. supports -legacy flag for legacy code gen
2. supports -hostname flag for server hostname
3. use dart official format
4. fix some some bugs

Resolves: #1602

tools/goctl/api/dartgen/vars.go

@@ -3,6 +3,7 @@ package dartgen
 import "text/template"
 
 var funcMap = template.FuncMap{
+	"getBaseName":           getBaseName,
 	"getPropertyFromMember": getPropertyFromMember,
 	"isDirectType":          isDirectType,
 	"isClassListType":       isClassListType,
@@ -99,6 +100,96 @@ Future _apiRequest(String method, String path, dynamic data,
 }
 `
 
+	apiFileContentV2 = `import 'dart:io';
+	import 'dart:convert';
+	import '../vars/kv.dart';
+	import '../vars/vars.dart';
+
+	/// send request with post method
+	///
+	/// data: any request class that will be converted to json automatically
+	/// ok: is called when request succeeds
+	/// fail: is called when request fails
+	/// eventually: is always called until the nearby functions returns
+	Future apiPost(String path, dynamic data,
+			{Map<String, String>? header,
+			Function(Map<String, dynamic>)? ok,
+			Function(String)? fail,
+			Function? eventually}) async {
+		await _apiRequest('POST', path, data,
+				header: header, ok: ok, fail: fail, eventually: eventually);
+	}
+
+	/// send request with get method
+	///
+	/// ok: is called when request succeeds
+	/// fail: is called when request fails
+	/// eventually: is always called until the nearby functions returns
+	Future apiGet(String path,
+			{Map<String, String>? header,
+			Function(Map<String, dynamic>)? ok,
+			Function(String)? fail,
+			Function? eventually}) async {
+		await _apiRequest('GET', path, null,
+				header: header, ok: ok, fail: fail, eventually: eventually);
+	}
+
+	Future _apiRequest(String method, String path, dynamic data,
+			{Map<String, String>? header,
+			Function(Map<String, dynamic>)? ok,
+			Function(String)? fail,
+			Function? eventually}) async {
+		var tokens = await getTokens();
+		try {
+			var client = HttpClient();
+			HttpClientRequest r;
+			if (method == 'POST') {
+				r = await client.postUrl(Uri.parse('https://' + serverHost + path));
+			} else {
+				r = await client.getUrl(Uri.parse('https://' + serverHost + path));
+			}
+
+			r.headers.set('Content-Type', 'application/json');
+			if (tokens != null) {
+				r.headers.set('Authorization', tokens.accessToken);
+			}
+			if (header != null) {
+				header.forEach((k, v) {
+					r.headers.set(k, v);
+				});
+			}
+			var strData = '';
+			if (data != null) {
+				strData = jsonEncode(data);
+			}
+			r.write(strData);
+			var rp = await r.close();
+			var body = await rp.transform(utf8.decoder).join();
+			print('${rp.statusCode} - $path');
+			print('-- request --');
+			print(strData);
+			print('-- response --');
+			print('$body \n');
+			if (rp.statusCode == 404) {
+				if (fail != null) fail('404 not found');
+			} else {
+				Map<String, dynamic> base = jsonDecode(body);
+				if (rp.statusCode == 200) {
+					if (base['code'] != 0) {
+						if (fail != null) fail(base['desc']);
+					} else {
+						if (ok != null) ok(base['data']);
+					}
+				} else if (base['code'] != 0) {
+					if (fail != null) fail(base['desc']);
+				}
+			}
+		} catch (e) {
+			if (fail != null) fail(e.toString());
+		}
+		if (eventually != null) eventually();
+	}`
+
 	tokensFileContent = `class Tokens {
   /// 用于访问的token, 每次请求都必须带在Header里面
   final String accessToken;
@@ -132,5 +223,41 @@ Future _apiRequest(String method, String path, dynamic data,
     };
   }
 }
+`
+
+	tokensFileContentV2 = `class Tokens {
+  /// 用于访问的token, 每次请求都必须带在Header里面
+  final String accessToken;
+  final int accessExpire;
+
+  /// 用于刷新token
+  final String refreshToken;
+  final int refreshExpire;
+  final int refreshAfter;
+  Tokens({
+		required this.accessToken,
+		required this.accessExpire,
+		required this.refreshToken,
+		required this.refreshExpire,
+		required this.refreshAfter
+	});
+  factory Tokens.fromJson(Map<String, dynamic> m) {
+    return Tokens(
+        accessToken: m['access_token'],
+        accessExpire: m['access_expire'],
+        refreshToken: m['refresh_token'],
+        refreshExpire: m['refresh_expire'],
+        refreshAfter: m['refresh_after']);
+  }
+  Map<String, dynamic> toJson() {
+    return {
+      'access_token': accessToken,
+      'access_expire': accessExpire,
+      'refresh_token': refreshToken,
+      'refresh_expire': refreshExpire,
+      'refresh_after': refreshAfter,
+    };
+  }
+}
 `
 )