feat: intercept invite links in md, mentions clickable

Signed-off-by: Infi <infi@infi.sh>

app/src/main/java/chat/revolt/api/RevoltAPI.kt

@@ -46,6 +46,7 @@ const val REVOLT_MARKETING = "https://revolt.chat"
 const val REVOLT_FILES = "https://autumn.revolt.chat"
 const val REVOLT_JANUARY = "https://jan.revolt.chat"
 const val REVOLT_APP = "https://app.revolt.chat"
+const val REVOLT_INVITES = "https://rvlt.gg"
 const val REVOLT_WEBSOCKET = "wss://ws.revolt.chat"
 
 fun buildUserAgent(accessMethod: String = "Ktor"): String {

app/src/main/java/chat/revolt/callbacks/ActionChannel.kt

@@ -0,0 +1,11 @@
+package chat.revolt.callbacks
+
+import kotlinx.coroutines.channels.Channel
+
+sealed class Action {
+    data class OpenUserSheet(val userId: String, val serverId: String?) : Action()
+}
+
+val ActionChannel = Channel<Action>(
+    Channel.BUFFERED
+)

app/src/main/java/chat/revolt/internals/markdown/LinkSpan.kt

@@ -1,13 +1,59 @@
 package chat.revolt.internals.markdown
 
+import android.content.Intent
 import android.net.Uri
 import android.text.TextPaint
 import android.text.style.ClickableSpan
 import android.view.View
 import androidx.browser.customtabs.CustomTabsIntent
+import chat.revolt.activities.InviteActivity
+import chat.revolt.api.REVOLT_APP
+import chat.revolt.api.REVOLT_INVITES
+import chat.revolt.callbacks.Action
+import chat.revolt.callbacks.ActionChannel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.runBlocking
 
-class LinkSpan(private val url: String) : ClickableSpan() {
+class LinkSpan(private val url: String, private val drawBackground: Boolean = false) :
+    ClickableSpan() {
     override fun onClick(widget: View) {
+        val uri = Uri.parse(url)
+
+        // Intercept invite links
+        if (uri.host == Uri.parse(REVOLT_INVITES).host!! ||
+            (uri.host?.endsWith(Uri.parse(REVOLT_APP).host!!) == true && uri.path?.startsWith(
+                "/invite"
+            ) == true)
+        ) {
+            val intent = Intent(
+                widget.context,
+                InviteActivity::class.java
+            ).setAction(Intent.ACTION_VIEW)
+
+            intent.data = uri
+            widget.context.startActivity(intent)
+
+            return
+        }
+
+        if (url.startsWith("revolt-android://link-action")) {
+            // parse action
+            val action = uri.pathSegments[0]
+
+            when (action) {
+                "user" -> {
+                    val userId = uri.getQueryParameter("user")
+                    val serverId = uri.getQueryParameter("server")
+
+                    runBlocking(Dispatchers.IO) {
+                        ActionChannel.send(Action.OpenUserSheet(userId!!, serverId))
+                    }
+                }
+            }
+
+            return
+        }
+
         val customTab = CustomTabsIntent.Builder()
             .setShowTitle(true)
             .build()
@@ -18,5 +64,8 @@ class LinkSpan(private val url: String) : ClickableSpan() {
     override fun updateDrawState(ds: TextPaint) {
         ds.color = ds.linkColor
         ds.isUnderlineText = false
+        if (drawBackground) {
+            ds.bgColor = ds.linkColor and 0x33ffffff // 20% alpha
+        }
     }
 }

app/src/main/java/chat/revolt/internals/markdown/MarkdownNodes.kt

@@ -14,10 +14,23 @@ import java.util.Locale
 
 class UserMentionNode(private val userId: String) : Node<MarkdownContext>() {
     override fun render(builder: SpannableStringBuilder, renderContext: MarkdownContext) {
-        builder.append(
-            renderContext.memberMap[userId]?.let { "@$it" }
-                ?: renderContext.userMap[userId]?.let { "@${it.username}" }
-                ?: "<@${userId}>"
+        val content = renderContext.memberMap[userId]?.let { "@$it" }
+            ?: renderContext.userMap[userId]?.let { "@${it.username}" }
+            ?: "<@${userId}>"
+
+        builder.append(content)
+        builder.setSpan(
+            LinkSpan(
+                "revolt-android://link-action/user?user=$userId${
+                    renderContext.serverId?.let {
+                        "&server=$it"
+                    }.orEmpty()
+                }",
+                drawBackground = true
+            ),
+            builder.length - content.length,
+            builder.length,
+            Spanned.SPAN_EXCLUSIVE_EXCLUSIVE
         )
     }
 }

app/src/main/java/chat/revolt/screens/chat/ChatRouterScreen.kt

@@ -72,6 +72,8 @@ import chat.revolt.api.schemas.ChannelType
 import chat.revolt.api.schemas.User
 import chat.revolt.api.settings.FeatureFlag
 import chat.revolt.api.settings.SyncedSettings
+import chat.revolt.callbacks.Action
+import chat.revolt.callbacks.ActionChannel
 import chat.revolt.components.chat.DisconnectedNotice
 import chat.revolt.components.generic.GroupIcon
 import chat.revolt.components.generic.UserAvatar
@@ -348,6 +350,20 @@ fun ChatRouterScreen(
             }
     }
 
+    LaunchedEffect(Unit) {
+        while (true) {
+            ActionChannel.receive().let { action ->
+                when (action) {
+                    is Action.OpenUserSheet -> {
+                        userContextSheetTarget = action.userId
+                        userContextSheetServer = action.serverId
+                        showUserContextSheet = true
+                    }
+                }
+            }
+        }
+    }
+
     if (!viewModel.latestChangelogRead) {
         val changelogSheetState = rememberModalBottomSheetState()