[Add] 初步添加成人内容检测器, 尚未使用;

src/main/java/net/lamgc/cgj/pixiv/ModerateContentDetector.java

@@ -0,0 +1,65 @@
+package net.lamgc.cgj.pixiv;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonObject;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.util.EntityUtils;
+
+import java.io.IOException;
+
+/**
+ * 使用ModerateContent服务开发的检测器.<br/>
+ * ModerateContent: www.moderatecontent.com
+ */
+public class ModerateContentDetector implements AdultContentDetector {
+
+    private final static HttpClient httpClient = HttpClientBuilder.create().build();
+    private final static Gson gson = new Gson();
+    private final String requestUrl;
+
+    private final static String API_URL = "https://www.moderatecontent.com/api/v2?key={key}&url=https://pixiv.cat/";
+
+    /**
+     * 创建一个使用ModerateContent鉴黄服务的检测器
+     * @param apiKey API密钥
+     */
+    public ModerateContentDetector(String apiKey) {
+        requestUrl = API_URL.replace("{key}", apiKey);
+    }
+
+    private JsonObject accessInterface(int illustId, boolean isUgoira, int pageIndex) throws IOException {
+        HttpResponse response;
+        if(pageIndex <= 0) {
+            response = httpClient.execute(new HttpGet(requestUrl + illustId + (isUgoira ? ".gif" : ".jpg")));
+        } else {
+            response = httpClient.execute(new HttpGet(requestUrl + illustId + "-" + pageIndex + (isUgoira ? ".gif" : ".jpg")));
+        }
+        if(response.getStatusLine().getStatusCode() != 200) {
+            throw new IOException("Http response error: " + response.getStatusLine());
+        }
+
+        JsonObject result = gson.fromJson(EntityUtils.toString(response.getEntity()), JsonObject.class);
+        if (result.get("error_code").getAsInt() != 0) {
+            throw new IOException("Interface result error: " + (result.has("error") ? result.get("error").getAsString() : "(error message is empty)"));
+        }
+        return result;
+    }
+
+    @Override
+    public double detect(int illustId, boolean isUgoira, int pageIndex) throws IOException {
+        return accessInterface(illustId, isUgoira,  pageIndex).getAsJsonObject("predictions").get("adult").getAsDouble();
+    }
+
+    @Override
+    public boolean isAdultContent(int illustId, boolean isUgoira, int pageIndex) throws IOException {
+        return accessInterface(illustId, isUgoira, pageIndex).get("rating_index").getAsInt() == 3;
+    }
+
+    @Override
+    public boolean isAdultContent(int illustId, boolean isUgoira, int pageIndex, double threshold) throws IOException {
+        return detect(illustId, isUgoira,  pageIndex) >= threshold;
+    }
+}