fix onebot pic send problem

index.ts

-import { Adapter } from 'koishi';
+import { Adapter, Bot } from 'koishi';
 import _ from 'lodash';
 import { RegisterSchema, SchemaProperty } from 'schemastery-gen';
 
@@ -44,23 +44,37 @@ export class SendTarget {
     }
   }
 
+  private isOneBotBot(bot?: Bot) {
+    return (
+      bot &&
+      (bot.platform === 'onebot' || bot['parentBot']?.platform === 'onebot')
+    );
+  }
+
   async send(bots: Adapter.BotList, content: string) {
     const bot = this.getBot(bots);
     if (!bot) {
       throw new Error(`bot ${this.bot} not found`);
     }
+    let privateContent = content;
+    let channelContent = content;
+    if (this.isOneBotBot(bot)) {
+      content = content.replace(/,url=base64/g, ',file=base64');
+      privateContent = content.replace(/,url=http/g, ',file=http'); // private should be file
+      channelContent = content.replace(/,file=http/g, ',url=http'); // channel should be url
+    }
     return _.flatten(
       await Promise.all([
         ...this.users.map((userId) =>
           bot.sendPrivateMessage
-            ? bot.sendPrivateMessage(userId, content)
-            : bot.sendMessage(`@${userId}`, content),
+            ? bot.sendPrivateMessage(userId, privateContent)
+            : bot.sendMessage(`@${userId}`, privateContent),
         ),
         ...(this.channels?.length
           ? [
               bot.broadcast(
                 this.channels.map((c) => c.toDesc()),
-                content,
+                channelContent,
               ),
             ]
           : []),

package.json

@@ -54,7 +54,7 @@
     "typescript": "^4.6.2"
   },
   "peerDependencies": {
-    "koishi": "^4.7.1",
+    "koishi": "^4.7.4",
     "schemastery": "^3.4.3",
     "schemastery-gen": "^3.1.6"
   },