wip: feat: add formated text display

app/build.gradle.kts

@@ -1,7 +1,6 @@
 /*
  * Created by sweetbread
  * Copyright (c) 2025. All rights reserved.
- * Last modified 03.03.2025, 16:46
  */
 
 plugins {
@@ -86,5 +85,6 @@ dependencies {
     androidTestImplementation(libs.androidx.navigation.testing)
 
     // Others
-    implementation(libs.splitties.base)  // Syntax sugar
+    implementation(libs.splitties.base)           // Syntax sugar
+    implementation(libs.jsoup)                    // HTML parser
 }

app/src/main/java/ru/risdeveau/pixeldragon/ui/layout/Room.kt

@@ -1,11 +1,16 @@
 /*
  * Created by sweetbread
  * Copyright (c) 2025. All rights reserved.
- * Last modified 03.03.2025, 21:30
  */
 
 package ru.risdeveau.pixeldragon.ui.layout
 
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.webkit.WebResourceRequest
+import android.webkit.WebView
+import android.webkit.WebViewClient
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -15,9 +20,11 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -26,11 +33,17 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.toArgb
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import androidx.compose.ui.viewinterop.AndroidView
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
+import org.jsoup.Jsoup
+import org.jsoup.safety.Safelist
 import ru.risdeveau.pixeldragon.api.Event
 import ru.risdeveau.pixeldragon.api.getAccountData
 import ru.risdeveau.pixeldragon.api.getEventsAround
@@ -67,6 +80,7 @@ fun Room(modifier: Modifier = Modifier, rid: String) {
     }
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun EventItem(event: Event) {
     Box (Modifier.fillMaxWidth()) {
@@ -82,9 +96,225 @@ fun EventItem(event: Event) {
                     .padding(4.dp)
             ) {
                 Text(event.sender, maxLines = 1, fontWeight = FontWeight.Bold)
-                Text(event.content.getString("body"))
+
+                when (event.content.optString("format")) {
+                    "org.matrix.custom.html" ->
+                        HtmlRenderer(event.content.getString("formatted_body"))
+
+                    else -> Text(event.content.getString("body"))
+                }
             }
-            else -> Text(event.type, Modifier.padding(4.dp).background(MaterialTheme.colorScheme.errorContainer).padding(4.dp))
+            else -> Text(event.type,
+                Modifier
+                    .padding(4.dp)
+                    .background(MaterialTheme.colorScheme.errorContainer)
+                    .padding(4.dp)
+            )
         }
     }
+}
+
+private fun String.sanitizeHTML(): String {
+    val matrixSafelist = Safelist()
+        .addTags(
+            "h1", "h2", "h3", "h4", "h5", "h6",
+            "b", "i", "u", "strong", "s", "del",
+            "sup", "sub", "code",
+            "table", "thead", "tbody",
+            "tr", "th", "td", "ul", "ol", "li",
+            "blockquote", "details", "summary",
+            "em", "code", "div", "pre", "span", "img"
+        )
+//        .addAttributes("span",
+//            "data-mx-bg-color", "data-mx-color",
+//            "data-mx-spoiler", "data-mx-maths"
+//        )
+        .addAttributes("a",
+            "target", "href"
+        )
+        .addAttributes("img",
+            "width", "height", "alt", "title", "src"
+        )
+        .addAttributes("ol", "start")
+        .addAttributes("code", "class")
+        .addAttributes("div", "data-mx-maths")
+
+    val doc = Jsoup.parse(this)
+    doc.select("mx-reply").remove()
+
+    val out = Jsoup.clean(doc.body().wholeText(), matrixSafelist)
+    return out
+}
+
+
+@Composable
+fun HtmlRenderer(
+    htmlContent: String,
+    modifier: Modifier = Modifier
+) {
+    val context = LocalContext.current
+    val webView = remember { WebView(context).apply {
+        settings.apply {
+            javaScriptEnabled = false
+            loadWithOverviewMode = true
+            useWideViewPort = true
+        }
+        isVerticalScrollBarEnabled = false
+        setBackgroundColor(Color.Transparent.toArgb())
+    } }
+
+    val css = """
+        body {
+            font-family: -apple-system, sans-serif;
+            font-size: 16px;
+            line-height: 1.6;
+            color: ${colorToCss(MaterialTheme.colorScheme.onBackground)};
+            margin: 0;
+            padding: 0;
+        }
+        h1, h2, h3, h4, h5, h6 {
+            font-weight: bold;
+            padding: 0;
+        }
+        h1 { font-size: 24px; }
+        h2 { font-size: 22px; }
+        h3 { font-size: 20px; }
+        h4 { font-size: 18px; }
+        h5 { font-size: 16px; }
+        h6 { font-size: 14px; }
+        a {
+            color: ${colorToCss(MaterialTheme.colorScheme.primary)};
+            text-decoration: none;
+        }
+        img {
+            max-width: 100%;
+            height: auto;
+            display: block;
+            margin: 12px 0;
+        }
+        table {
+            width: 100%;
+            border-collapse: collapse;
+            margin: 16px 0;
+        }
+        th, td {
+            border: 1px solid ${colorToCss(MaterialTheme.colorScheme.outline)};
+            padding: 12px;
+            text-align: left;
+        }
+        th {
+            background-color: ${colorToCss(MaterialTheme.colorScheme.surfaceVariant)};
+            font-weight: bold;
+        }
+        blockquote {
+            border-left: 4px solid ${colorToCss(MaterialTheme.colorScheme.primary)};
+            padding-left: 16px;
+            margin-left: 0;
+            color: ${colorToCss(MaterialTheme.colorScheme.onSurfaceVariant)};
+        }
+        pre {
+            background-color: ${colorToCss(MaterialTheme.colorScheme.surfaceVariant)};
+            padding: 16px;
+            overflow: auto;
+            border-radius: 4px;
+        }
+        code {
+            font-family: monospace;
+            background-color: ${colorToCss(MaterialTheme.colorScheme.surfaceVariant)};
+            padding: 2px 4px;
+            border-radius: 4px;
+        }
+        hr {
+            border: 0;
+            height: 1px;
+            background-color: ${colorToCss(MaterialTheme.colorScheme.outline)};
+            margin: 24px 0;
+        }
+        ul, ol {
+            padding-left: 24px;
+            margin: 12px 0;
+        }
+        li {
+            margin-bottom: 8px;
+        }
+        details {
+            margin: 12px 0;
+        }
+        summary {
+            font-weight: bold;
+            cursor: pointer;
+        }
+        @media (prefers-color-scheme: dark) {
+            :root {
+                --border-color: ${colorToCss(MaterialTheme.colorScheme.outline)};
+            }
+        }
+    """.trimIndent()
+
+    LaunchedEffect(htmlContent) {
+        webView.loadDataWithBaseURL(
+            null,
+            wrapHtml(htmlContent, css),
+            "text/html",
+            "UTF-8",
+            null
+        )
+    }
+
+    DisposableEffect(webView) {
+        onDispose {
+            webView.destroy()
+        }
+    }
+
+    AndroidView(
+        factory = { webView },
+        modifier = modifier,
+        update = { view ->
+            view.webViewClient = SafeWebViewClient(context)
+        }
+    )
+}
+
+private class SafeWebViewClient(
+    private val context: Context
+) : WebViewClient() {
+    override fun shouldOverrideUrlLoading(
+        view: WebView,
+        request: WebResourceRequest
+    ): Boolean {
+        val url = request.url.toString()
+        try {
+            // Открываем ссылки во внешнем браузере
+            context.startActivity(
+                Intent(Intent.ACTION_VIEW, Uri.parse(url))
+            )
+            return true
+        } catch (e: Exception) {
+            // Обработка ошибок открытия ссылки
+            return false
+        }
+    }
+}
+
+private fun wrapHtml(content: String, css: String): String {
+    return """
+    <!DOCTYPE html>
+    <html>
+    <head>
+        <meta name="viewport" content="width=device-width, initial-scale=1">
+        <style>
+            $css
+        </style>
+    </head>
+    <body>
+        ${content.sanitizeHTML()}
+    </body>
+    </html>
+    """.trimIndent()
+}
+
+private fun colorToCss(color: Color): String {
+    val argb = color.toArgb()
+    return String.format("#%06X", 0xFFFFFF and argb)
 }