Add fonts support

app/build.gradle.kts

@@ -13,7 +13,7 @@ android {
         minSdk = 24
         targetSdk = 33
         versionCode = 1
-        versionName = "0.1.0"
+        versionName = "0.1.1"
     }
 
     buildTypes {

app/src/main/kotlin/com/pyoncord/xposed/FontsModule.kt

@@ -0,0 +1,153 @@
+// credits to janisslsm from his PR: https://github.com/vendetta-mod/VendettaXposed/pull/17
+// the functions hooked are based on the RN codebase, just modified to add fonts
+
+package com.pyoncord.xposed
+
+import android.content.res.AssetManager
+import android.os.Build
+import android.graphics.Color
+import android.graphics.Typeface
+import android.graphics.Typeface.CustomFallbackBuilder
+import android.graphics.fonts.Font
+import android.graphics.fonts.FontFamily
+import android.webkit.URLUtil
+import de.robv.android.xposed.XC_MethodReplacement
+import de.robv.android.xposed.XposedBridge
+import de.robv.android.xposed.XposedHelpers
+import de.robv.android.xposed.callbacks.XC_LoadPackage
+import kotlinx.serialization.json.*
+import java.io.IOException
+import java.io.File
+
+class FontsModule: PyonModule() {
+    private val EXTENSIONS = arrayOf("", "_bold", "_italic", "_bold_italic")
+    private val FILE_EXTENSIONS = arrayOf(".ttf", ".otf")
+    private val FONTS_ASSET_PATH = "fonts/"
+    private lateinit var fontsDir: File
+    private lateinit var fontsAbsPath: String
+
+    override fun buildJson(builder: JsonObjectBuilder) {
+        builder.apply {
+            put("supportFonts", true)
+        }
+    }
+
+    override fun onInit(packageParam: XC_LoadPackage.LoadPackageParam) = with (packageParam) {
+        fontsDir = File(appInfo.dataDir, "files/pyoncord/fonts").also { it.mkdirs() }
+        fontsAbsPath = fontsDir.absolutePath + "/"
+
+        XposedHelpers.findAndHookMethod("com.facebook.react.views.text.ReactFontManager", classLoader, "createAssetTypeface",
+            String::class.java,
+            Int::class.java,
+            "android.content.res.AssetManager", object : XC_MethodReplacement() {
+                override fun replaceHookedMethod(param: MethodHookParam): Typeface? {
+                    val fontFamilyName: String = param.args[0].toString();
+                    val style: Int = param.args[1] as Int;
+                    val assetManager: AssetManager = param.args[2] as AssetManager;
+                    return createAssetTypeface(fontFamilyName, style, assetManager)
+                }
+            });
+
+        return@with
+    }
+
+    private fun createAssetTypefaceWithFallbacks(
+        fontFamilyNames: Array<String>,
+        style: Int,
+        assetManager: AssetManager
+    ): Typeface? {
+        val fontFamilies: MutableList<FontFamily> = ArrayList()
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            // Iterate over the list of fontFamilyNames, constructing new FontFamily objects
+            // for use in the CustomFallbackBuilder below.
+            for (fontFamilyName in fontFamilyNames) {
+                for (fontRootPath in arrayOf(fontsAbsPath, FONTS_ASSET_PATH)) {
+                    for (fileExtension in FILE_EXTENSIONS) {
+                        val fileName = java.lang.StringBuilder()
+                            .append(fontRootPath)
+                            .append(fontFamilyName)
+                            .append(fileExtension)
+                            .toString()
+                        try {
+                            val builder = if (fileName[0] == '/') Font.Builder(File(fileName)) else Font.Builder(assetManager, fileName)
+                            val font = builder.build()
+                            val family = FontFamily.Builder(font).build()
+                            fontFamilies.add(family)
+                        } catch (e: java.lang.RuntimeException) {
+                            // If the typeface asset does not exist, try another extension.
+                            continue
+                        } catch (e: IOException) {
+                            // If the font asset does not exist, try another extension.
+                            continue
+                        }
+                    }
+                }
+            }
+
+            // If there's some problem constructing fonts, fall back to the default behavior.
+            if (fontFamilies.size == 0) {
+                return createAssetTypeface(fontFamilyNames[0], style, assetManager)
+            }
+            val fallbackBuilder = CustomFallbackBuilder(fontFamilies[0])
+            for (i in 1 until fontFamilies.size) {
+                fallbackBuilder.addCustomFallback(fontFamilies[i])
+            }
+            return fallbackBuilder.build()
+        }
+        return null
+    }
+
+    private fun createAssetTypeface(
+        fontFamilyName_: String, style: Int, assetManager: AssetManager
+    ): Typeface? {
+        // This logic attempts to safely check if the frontend code is attempting to use
+        // fallback fonts, and if it is, to use the fallback typeface creation logic.
+        var fontFamilyName: String = fontFamilyName_
+        val fontFamilyNames =
+            fontFamilyName.split(",".toRegex())
+                .dropLastWhile { it.isEmpty() }
+                .toTypedArray()
+        for (i in fontFamilyNames.indices) {
+            fontFamilyNames[i] = fontFamilyNames[i].trim()
+        }
+
+        // If there are multiple font family names:
+        //   For newer versions of Android, construct a Typeface with fallbacks
+        //   For older versions of Android, ignore all the fallbacks and just use the first font family
+        if (fontFamilyNames.size > 1) {
+            fontFamilyName = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                return createAssetTypefaceWithFallbacks(fontFamilyNames, style, assetManager)
+            } else {
+                fontFamilyNames[0]
+            }
+        }
+
+        val extension = EXTENSIONS[style]
+
+        // Lastly, after all those checks above, this is the original RN logic for
+        // getting the typeface.
+        for (fontRootPath in arrayOf(fontsAbsPath, FONTS_ASSET_PATH)) {
+            for (fileExtension in FILE_EXTENSIONS) {
+                val fileName = java.lang.StringBuilder()
+                    .append(fontRootPath)
+                    .append(fontFamilyName)
+                    .append(extension)
+                    .append(fileExtension)
+                    .toString()
+
+                return try {
+                    if (fileName[0] == '/')
+                        Typeface.createFromFile(fileName)
+                    else
+                        Typeface.createFromAsset(assetManager, fileName)
+                } catch (e: java.lang.RuntimeException) {
+                    // If the typeface asset does not exist, try another extension.
+                    XposedBridge.log("(under) acquiring $fileName font failed ${e.cause}")
+                    continue
+                }
+            }
+        }
+
+        return Typeface.create(fontFamilyName, style)
+    }
+}

app/src/main/kotlin/com/pyoncord/xposed/Main.kt

@@ -34,7 +34,8 @@ data class LoaderConfig(
 class Main : IXposedHookLoadPackage {
     private val pyonModules: Array<PyonModule> = arrayOf(
         ThemeModule(),
-        SysColorsModule()
+        SysColorsModule(),
+        FontsModule()
     )
 
     fun buildLoaderJsonString(): String {
@@ -152,7 +153,7 @@ class Main : IXposedHookLoadPackage {
                         )
                     }
 
-                XposedBridge.invokeOriginalMethod(
+                if (bundle.exists()) XposedBridge.invokeOriginalMethod(
                     loadScriptFromFile, 
                     param.thisObject, 
                     arrayOf(bundle.absolutePath, bundle.absolutePath, param.args[2])