Added custom scheme redirect

app/src/main/AndroidManifest.xml

@@ -242,6 +242,15 @@
                     android:path="/oauth/"
                     android:scheme="https" />
             </intent-filter>
+
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <data android:scheme="eu.faircode.email" />
+            </intent-filter>
         </activity>
 
         <service

app/src/main/java/eu/faircode/email/ActivitySetup.java

@@ -79,7 +79,8 @@ import net.openid.appauth.ClientSecretPost;
 import net.openid.appauth.NoClientAuthentication;
 import net.openid.appauth.ResponseTypeValues;
 import net.openid.appauth.TokenResponse;
-import net.openid.appauth.browser.BrowserBlacklist;
+import net.openid.appauth.browser.BrowserDescriptor;
+import net.openid.appauth.browser.BrowserMatcher;
 import net.openid.appauth.browser.Browsers;
 import net.openid.appauth.browser.VersionRange;
 import net.openid.appauth.browser.VersionedBrowserMatcher;
@@ -1157,13 +1158,17 @@ public class ActivitySetup extends ActivityBase implements FragmentManager.OnBac
 
     private AuthorizationService getAuthorizationService() {
         AppAuthConfiguration appAuthConfig = new AppAuthConfiguration.Builder()
-                .setBrowserMatcher(new BrowserBlacklist(
-                        new VersionedBrowserMatcher(
+                .setBrowserMatcher(new BrowserMatcher() {
+                    @Override
+                    public boolean matches(@NonNull BrowserDescriptor descriptor) {
+                        BrowserMatcher sbrowser = new VersionedBrowserMatcher(
                                 Browsers.SBrowser.PACKAGE_NAME,
                                 Browsers.SBrowser.SIGNATURE_SET,
                                 true,
-                                VersionRange.atMost("5.3")
-                        )))
+                                VersionRange.atMost("5.3"));
+                        return descriptor.useCustomTab && !sbrowser.matches(descriptor);
+                    }
+                })
                 .build();
 
         return new AuthorizationService(this, appAuthConfig);
@@ -1237,7 +1242,8 @@ public class ActivitySetup extends ActivityBase implements FragmentManager.OnBac
 
                                         Log.i("OAuth token provider=" + provider.name);
 
-                                        if ("Outlook/Office365".equals(provider.name)) {
+                                        if ("Gmail".equals(provider.name)) {
+                                        } else if ("Outlook/Office365".equals(provider.name)) {
                                             authState.performActionWithFreshTokens(getAuthorizationService(), new AuthState.AuthStateAction() {
                                                 @Override
                                                 public void execute(String accessToken, String idToken, AuthorizationException error) {

app/src/main/java/eu/faircode/email/FragmentSetup.java

@@ -169,13 +169,12 @@ public class FragmentSetup extends FragmentBase {
                 int order = 1;
                 popupMenu.getMenu().add(Menu.NONE, R.string.title_setup_gmail, order++, R.string.title_setup_gmail);
 
-                // Android 5 Lollipop does not support app links
-                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M)
-                    for (EmailProvider provider : EmailProvider.loadProfiles(getContext()))
-                        if (provider.oauth != null && (provider.oauth.enabled || BuildConfig.DEBUG))
-                            popupMenu.getMenu()
-                                    .add(Menu.NONE, -1, order++, getString(R.string.title_setup_oauth, provider.name))
-                                    .setIntent(new Intent(ActivitySetup.ACTION_QUICK_OAUTH).putExtra("name", provider.name));
+                for (EmailProvider provider : EmailProvider.loadProfiles(getContext()))
+                    if (provider.oauth != null && (provider.oauth.enabled || BuildConfig.DEBUG))
+                        popupMenu.getMenu()
+                                .add(Menu.NONE, -1, order++, getString(R.string.title_setup_oauth, provider.name))
+                                .setIntent(new Intent(ActivitySetup.ACTION_QUICK_OAUTH)
+                                        .putExtra("name", provider.name));
 
                 popupMenu.getMenu().add(Menu.NONE, R.string.title_setup_activesync, order++, R.string.title_setup_activesync);
                 popupMenu.getMenu().add(Menu.NONE, R.string.title_setup_other, order++, R.string.title_setup_other);

tools/assetlinks.json

@@ -0,0 +1,14 @@
+[{
+  "relation": ["delegate_permission/common.handle_all_urls"],
+  "target" : { "namespace": "android_app", "package_name": "eu.faircode.email",
+               "sha256_cert_fingerprints": ["E0:20:67:24:9F:5A:35:0E:0E:C7:03:FE:9D:F4:DD:68:2E:02:91:A0:9F:0C:2E:04:10:50:BB:E7:C0:64:F5:C9"] }
+},
+{
+  "relation": ["delegate_permission/common.handle_all_urls"],
+  "target" : { "namespace": "android_app", "package_name": "eu.faircode.email.debug",
+               "sha256_cert_fingerprints": ["83:9E:69:DC:B7:B6:28:EF:38:AE:C7:3E:03:1D:D4:8C:15:BC:8A:BC:F9:12:39:32:EF:FE:10:62:60:FD:7C:73"] }
+},
+{
+  "relation": ["delegate_permission/common.handle_all_urls"],
+  "target": { "namespace": "web", "site": "https://email.faircode.eu" }
+}]

tools/oauth.html

@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta http-equiv="x-ua-compatible" content="ie=edge" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <title>FairEmail - OAuth</title>
+</head>
+<body>
+    <h1>FairEmail OAuth</h1>
+    <script>
+        function oauth() {
+            document.location = 'eu.faircode.email://oauth' + window.location.search;
+        }
+    </script>
+    <button onclick="oauth()">Continue</button>
+</body>
+</html>