feat: add gravatar command

src/main/kotlin/cn/rtast/fancybot/Const.kt

@@ -126,5 +126,6 @@ val commands = listOf(
     ZDJDCommand(), ScanQRCodeCommand(), TTSCommand(), SlimeChunkHelperCommand(),
     SupportMeCommand(), TheCatCommand(), TheHistoryOfTodayCommand(), MCVersionCommand(),
     MinecraftWikiCommand(), GaoKaoDaysRemainCommand(), IdiomExplainCommand(), NiuziManagerCommand(),
-    TodayEatCommand(), TodayDrinkCommand(), MCLoginCommand(), RCONCommand()
+    TodayEatCommand(), TodayDrinkCommand(), MCLoginCommand(), RCONCommand(),
+    GravatarCommand()
 )

src/main/kotlin/cn/rtast/fancybot/commands/lookup/GravatarCommand.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2024 RTAkland
+ * Author: RTAkland
+ * Date: 2024/10/14
+ */
+
+
+package cn.rtast.fancybot.commands.lookup
+
+import cn.rtast.fancybot.annotations.CommandDescription
+import cn.rtast.fancybot.util.misc.toURL
+import cn.rtast.fancybot.util.str.encodeToBase64
+import cn.rtast.fancybot.util.str.getMD5
+import cn.rtast.rob.entity.GroupMessage
+import cn.rtast.rob.util.BaseCommand
+import cn.rtast.rob.util.ob.MessageChain
+import cn.rtast.rob.util.ob.OneBotListener
+
+@CommandDescription("查询用户的Gravatar头像")
+class GravatarCommand : BaseCommand() {
+    override val commandNames = listOf("/g", "/gravatar")
+
+    companion object {
+        private const val GRAVATAR_URL = "https://gravatar.rtast.cn/avatar"
+    }
+
+    override suspend fun executeGroup(listener: OneBotListener, message: GroupMessage, args: List<String>) {
+        val emailMD5 = if (args.first().trim().lowercase().contains("@")) args.first().trim().lowercase().getMD5()
+        else args.first().trim().lowercase()
+        val avatarImage = "$GRAVATAR_URL/$emailMD5?size=256".toURL().readBytes().encodeToBase64()
+        val msg = MessageChain.Builder().addImage(avatarImage, true).build()
+        message.reply(msg)
+    }
+}

src/main/kotlin/cn/rtast/fancybot/util/str/StringFormatter.kt

@@ -9,6 +9,7 @@ package cn.rtast.fancybot.util.str
 
 import java.awt.Graphics2D
 import java.net.URLEncoder
+import java.security.MessageDigest
 
 fun setTruncate(origin: String, g2d: Graphics2D, maxWidth: Int = 500): String {
     val fontMetrics = g2d.fontMetrics
@@ -50,4 +51,14 @@ fun Int.formatToMinutes(): String {
 
 val String.proxy get() = this.replace("https://", "https://proxy.rtast.cn/https/")
 
-val String.uriEncode get() = URLEncoder.encode(this, "UTF-8")
+val String.uriEncode get() = URLEncoder.encode(this, "UTF-8")
+
+fun String.getMD5(): String {
+    return this.toByteArray().getMD5()
+}
+
+fun ByteArray.getMD5(): String {
+    val md = MessageDigest.getInstance("MD5")
+    val hashBytes = md.digest(this)
+    return hashBytes.joinToString("") { "%02x".format(it) }
+}