feat(Spotify): Add Fix Facebook login patch (#5023)

Author: Nuckyz

patches/api/patches.api

@@ -1,3 +1,7 @@
+public final class FixFacebookLoginPatchKt {
+	public static final fun getFixFacebookLoginPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
+}
+
 public final class app/revanced/patches/all/misc/activity/exportall/ExportAllActivitiesPatchKt {
 	public static final fun getExportAllActivitiesPatch ()Lapp/revanced/patcher/patch/ResourcePatch;
 }

patches/src/main/kotlin/app/revanced/patches/spotify/misc/fix/SpoofSignaturePatch.kt

@@ -7,7 +7,5 @@ import app.revanced.patcher.patch.bytecodePatch
 val spoofSignaturePatch = bytecodePatch(
     description = "Spoofs the signature of the app fix various functions of the app.",
 ) {
-    compatibleWith("com.spotify.music")
-
     dependsOn(spoofPackageInfoPatch)
 }

patches/src/main/kotlin/app/revanced/patches/spotify/misc/fix/login/Fingerprints.kt

@@ -0,0 +1,13 @@
+package app.revanced.patches.spotify.misc.fix.login
+
+import app.revanced.patcher.fingerprint
+import app.revanced.util.literal
+
+internal val katanaProxyLoginMethodHandlerClassFingerprint = fingerprint {
+    strings("katana_proxy_auth")
+}
+
+internal val katanaProxyLoginMethodTryAuthorizeFingerprint = fingerprint {
+    strings("e2e")
+    literal { 0 }
+}

patches/src/main/kotlin/app/revanced/patches/spotify/misc/fix/login/FixFacebookLoginPatch.kt

@@ -0,0 +1,29 @@
+package app.revanced.patches.spotify.misc.fix.login
+
+import app.revanced.patcher.patch.bytecodePatch
+import app.revanced.util.returnEarly
+
+@Suppress("unused")
+val fixFacebookLoginPatch = bytecodePatch(
+    name = "Fix Facebook login",
+    description =
+        "Fix logging in with Facebook when the app is patched by always opening the login in a web browser window.",
+) {
+    compatibleWith("com.spotify.music")
+
+    execute {
+        // The Facebook SDK tries to handle the login using the Facebook app in case it is installed.
+        // However, the Facebook app does signature checks with the app that is requesting the authentication,
+        // which ends up making the Facebook server reject with an invalid key hash for the app signature.
+        // Override the Faceboook SDK to always handle the login using the web browser, which does not perform
+        // signature checks.
+
+        val katanaProxyLoginMethodHandlerClass = katanaProxyLoginMethodHandlerClassFingerprint.originalClassDef
+        // Always return 0 (no Intent was launched) as the result of trying to authorize with the Facebook app to 
+        // make the login fallback to a web browser window.
+        katanaProxyLoginMethodTryAuthorizeFingerprint
+            .match(katanaProxyLoginMethodHandlerClass)
+            .method
+            .returnEarly(0)
+    }
+}