1

我正在尝试从我的 wordpress 网站http://crunchbox.epizy.com/wp-json/wp/v2/解析 json，该应用程序从所有现有帖子中获取标题和特色图像，代码如下：

final String apiUrl = "http://crunchbox.epizy.com/wp-json/wp/v2/";
  List posts;

  Future<String> getPosts() async {
    var res = await http.get(apiUrl,
        headers: {"Accept": "application/json"});

    setState(() {
      var resBody = jsonDecode(res.body);
      print(resBody);
      posts = resBody;
    });
    return "Success!";

运行此代码后，我收到此错误：

E/flutter ( 2931): [ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 2931): FormatException: Unexpected character (at character 1)
E/flutter ( 2931): <html><body><script type="text/javascript" src="/aes.js" ></script><script>...
E/flutter ( 2931): ^
E/flutter ( 2931): 
E/flutter ( 2931): #0      _ChunkedJsonParser.fail (dart:convert/runtime/libconvert_patch.dart:1362:5)
E/flutter ( 2931): #1      _ChunkedJsonParser.parseNumber (dart:convert/runtime/libconvert_patch.dart:1258:9)
E/flutter ( 2931): #2      _ChunkedJsonParser.parse (dart:convert/runtime/libconvert_patch.dart:926:22)
E/flutter ( 2931): #3      _parseJson (dart:convert/runtime/libconvert_patch.dart:29:10)
E/flutter ( 2931): #4      JsonDecoder.convert (dart:convert/json.dart:542:36)
E/flutter ( 2931): #5      JsonCodec.decode (dart:convert/json.dart:169:41)
E/flutter ( 2931): #6      jsonDecode (dart:convert/json.dart:101:10)
E/flutter ( 2931): #7      _WordpressHomeState.getPosts.<anonymous closure> (file:///C:/Users/Arbaaz_AJ/IdeaProjects/wordpress_flutter/lib/main.dart:31:21)
E/flutter ( 2931): #8      State.setState (package:flutter/src/widgets/framework.dart:1125:30)
E/flutter ( 2931): #9      _WordpressHomeState.getPosts (file:///C:/Users/Arbaaz_AJ/IdeaProjects/wordpress_flutter/lib/main.dart:30:5)
E/flutter ( 2931): <asynchronous suspension>
E/flutter ( 2931): #10     _WordpressHomeState.initState (file:///C:/Users/Arbaaz_AJ/IdeaProjects/wordpress_flutter/lib/main.dart:41:10)
E/flutter ( 2931): #11     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3751:58)
E/flutter ( 2931): #12     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3617:5)
E/flutter ( 2931): #13     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #14     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #15     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4654:14)
E/flutter ( 2931): #16     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #17     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #18     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3653:16)
E/flutter ( 2931): #19     Element.rebuild (package:flutter/src/widgets/framework.dart:3495:5)
E/flutter ( 2931): #20     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3622:5)
E/flutter ( 2931): #21     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3617:5)
E/flutter ( 2931): #22     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #23     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #24     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4654:14)
E/flutter ( 2931): #25     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #26     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #27     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4654:14)
E/flutter ( 2931): #28     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #29     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #30     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4654:14)
E/flutter ( 2931): #31     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #32     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #33     SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:4654:14)
E/flutter ( 2931): #34     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #35     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #36     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3653:16)
E/flutter ( 2931): #37     Element.rebuild (package:flutter/src/widgets/framework.dart:3495:5)
E/flutter ( 2931): #38     ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:3622:5)
E/flutter ( 2931): #39     StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3769:11)
E/flutter ( 2931): #40     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3617:5)
E/flutter ( 2931): #41     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2907:14)
E/flutter ( 2931): #42     Element.updateChild (package:flutter/src/widgets/framework.dart:2710:12)
E/flutter ( 2931): #43     ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:3653:16)
E/flutter ( 2931): #44     Element.rebuild (package:flutter/src/widg

我想要实现的是在列表视图中获取标题和摘录，这里是代码：

FadeInImage.memoryNetwork(
                        placeholder: kTransparentImage,
                        image: posts[index]["featured_media"] == 0
                            ? 'images/placeholder.png'
                            : posts[index]["_embedded"]["wp:featuredmedia"][0]
                                ["source_url"],
                      ),
                      Padding(
                        padding: EdgeInsets.all(10.0),
                        child: ListTile(
                          title: Padding(
                            padding: EdgeInsets.symmetric(vertical: 10.0),
                            child: Text(posts[index]["title"]["rendered"]),
                          ),
                          subtitle: Text(posts[index]["excerpt"]["rendered"]
                              .replaceAll(new RegExp(r'<[^>]*>'), '')),
                        ),

请帮帮我，谢谢。

4

1 回答 1

0

您的 API 正在返回一个 html 响应，作为其机器人保护的一部分。响应实际上是一些代码，需要在服务器允许它访问 API 之前在您的客户端上运行。

这是它返回的 html（不是故意格式化的）：

<html><body><script type="text/javascript" src="/aes.js" ></script><script>function toNumbers(d){var e=[];d.replace(/(..)/g,function(d){e.push(parseInt(d,16))});return e}function toHex(){for(var d=[],d=1==arguments.length&&arguments[0].constructor==Array?arguments[0]:arguments,e="",f=0;f<d.length;f++)e+=(16>d[f]?"0":"")+d[f].toString(16);return e.toLowerCase()}var a=toNumbers("..................."),b=toNumbers(".................."),c=toNumbers("...........");document.cookie="__test="+toHex(slowAES.decrypt(c,2,a,b))+"; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/"; location.href="http://crunchbox.epizy.com/wp-json/wp/v2/posts?i=1";</script><noscript>This site requires Javascript to work, please enable Javascript in your browser or use a browser with Javascript support</noscript></body></html>

重要的部分是中间的javascript：

function toNumbers(d) {
    var e = [];
    d.replace(/(..)/g, function(d) {
        e.push(parseInt(d, 16))
    });
    return e
}

function toHex() {
    for (var d = [], d = 1 == arguments.length && arguments[0].constructor == Array ? arguments[0] : arguments, e = "", f = 0; f < d.length; f++) e += (16 > d[f] ? "0" : "") + d[f].toString(16);
    return e.toLowerCase()
}
var a = toNumbers("..............."),
    b = toNumbers("..............."),
    c = toNumbers("...............");
document.cookie = "__test=" + toHex(slowAES.decrypt(c, 2, a, b)) + "; expires=Thu, 31-Dec-37 23:55:55 GMT; path=/";
location.href = "http://crunchbox.epizy.com/wp-json/wp/v2/posts?i=1"; < /script>

请注意，我已经替换了toNumber("abcd1234") with.....`中的三个二进制序列。

如果您有权访问为 wordpress 站点提供服务的 NGINX 服务器（我假设），则可以禁用此功能。或者您可以使用 wordpress 的身份验证并使用插件添加额外的身份验证方法 - 请参阅wordpress 文档底部的 api 身份验证。

第三种选择是您可以“运行” js 代码并使用标头将 cookie 设置到您的请求中。显然flutter无法原生运行js。但是理论上你可以在 android 和 ios 上使用 webviews 来做到这一点，或者你可以解析代码以找到“a”、“b”和“c”并使用某种库执行 AES-128 cbc 解密（这 可能工作，但没有承诺）。

于 2018-09-05T09:16:40.113 回答