From 50219005def9175f0bd635d9853cdbf6a2fc2c60 Mon Sep 17 00:00:00 2001
From: biezhi <biezhi.me@gmail.com>
Date: Sun, 31 Dec 2017 17:24:02 +0800
Subject: [PATCH] :sparkles: resolved (#333)

---
 src/main/java/com/tale/init/TaleConst.java  |  9 +++++-
 src/main/java/com/tale/utils/TaleUtils.java | 31 ++++++++++++++++-----
 2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/src/main/java/com/tale/init/TaleConst.java b/src/main/java/com/tale/init/TaleConst.java
index 6717084e..7362cfdc 100644
--- a/src/main/java/com/tale/init/TaleConst.java
+++ b/src/main/java/com/tale/init/TaleConst.java
@@ -86,5 +86,12 @@ public class TaleConst {
      */
     public static final String PLUGINS_MENU_NAME = "plugin_menus";
 
-
+    public static final String ENV_SUPPORT_163_MUSIC = "app.support_163_music";
+    public static final String ENV_SUPPORT_GIST      = "app.support_gist";
+    public static final String MP3_PREFIX            = "[mp3:";
+    public static final String MUSIC_IFRAME          = "<iframe frameborder=\"no\" border=\"0\" marginwidth=\"0\" marginheight=\"0\" width=350 height=106 src=\"//music.163.com/outchain/player?type=2&id=$1&auto=0&height=88\"></iframe>";
+    public static final String MUSIC_REG_PATTERN     = "\\[mp3:(\\d+)\\]";
+    public static final String GIST_PREFIX_URL       = "https://gist.github.com/";
+    public static final String GIST_REG_PATTERN      = "&lt;script src=\"https://gist.github.com/(\\w+)/(\\w+)\\.js\">&lt;/script>";
+    public static final String GIST_REPLATE_PATTERN  = "<script src=\"https://gist.github.com/$1/$2\\.js\"></script>";
 }
\ No newline at end of file
diff --git a/src/main/java/com/tale/utils/TaleUtils.java b/src/main/java/com/tale/utils/TaleUtils.java
index 694a7d3a..23677cb4 100644
--- a/src/main/java/com/tale/utils/TaleUtils.java
+++ b/src/main/java/com/tale/utils/TaleUtils.java
@@ -19,8 +19,12 @@
 import com.tale.model.entity.Users;
 import org.commonmark.Extension;
 import org.commonmark.ext.gfm.tables.TablesExtension;
+import org.commonmark.node.Link;
 import org.commonmark.node.Node;
 import org.commonmark.parser.Parser;
+import org.commonmark.renderer.html.AttributeProvider;
+import org.commonmark.renderer.html.AttributeProviderContext;
+import org.commonmark.renderer.html.AttributeProviderFactory;
 import org.commonmark.renderer.html.HtmlRenderer;
 
 import javax.imageio.ImageIO;
@@ -34,6 +38,8 @@
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
+import static com.tale.init.TaleConst.*;
+
 /**
  * Tale工具类
  * <p>
@@ -156,22 +162,33 @@ public static String mdToHtml(String markdown) {
         List<Extension> extensions = Arrays.asList(TablesExtension.create());
         Parser          parser     = Parser.builder().extensions(extensions).build();
         Node            document   = parser.parse(markdown);
-        HtmlRenderer    renderer   = HtmlRenderer.builder().extensions(extensions).build();
-        String          content    = renderer.render(document);
+        HtmlRenderer renderer = HtmlRenderer.builder()
+                .attributeProviderFactory(context -> new LinkAttributeProvider())
+                .extensions(extensions).build();
+
+        String content = renderer.render(document);
         content = Commons.emoji(content);
 
         // 支持网易云音乐输出
-        if (TaleConst.BCONF.getBoolean("app.support_163_music", true) && content.contains("[mp3:")) {
-            content = content.replaceAll("\\[mp3:(\\d+)\\]", "<iframe frameborder=\"no\" border=\"0\" marginwidth=\"0\" marginheight=\"0\" width=350 height=106 src=\"//music.163.com/outchain/player?type=2&id=$1&auto=0&height=88\"></iframe>");
+        if (TaleConst.BCONF.getBoolean(ENV_SUPPORT_163_MUSIC, true) && content.contains(MP3_PREFIX)) {
+            content = content.replaceAll(MUSIC_REG_PATTERN, MUSIC_IFRAME);
         }
         // 支持gist代码输出
-        if (TaleConst.BCONF.getBoolean("app.support_gist", true) && content.contains("https://gist.github.com/")) {
-            content = content.replaceAll("&lt;script src=\"https://gist.github.com/(\\w+)/(\\w+)\\.js\">&lt;/script>", "<script src=\"https://gist.github.com/$1/$2\\.js\"></script>");
+        if (TaleConst.BCONF.getBoolean(ENV_SUPPORT_GIST, true) && content.contains(GIST_PREFIX_URL)) {
+            content = content.replaceAll(GIST_REG_PATTERN, GIST_REPLATE_PATTERN);
         }
-
         return content;
     }
 
+    static class LinkAttributeProvider implements AttributeProvider {
+        @Override
+        public void setAttributes(Node node, String tagName, Map<String, String> attributes) {
+            if (node instanceof Link) {
+                attributes.put("target", "_blank");
+            }
+        }
+    }
+
     /**
      * 提取html中的文字
      *