fix: support credential extraction from Emby

src/screens/modals/SetJellyfinServer/components/CredentialGenerator.tsx

@@ -8,6 +8,47 @@ interface Props {
     onCredentialsRetrieved: (credentials: AppState['settings']['jellyfin']) => void;
 }
 
+type CredentialEventData = {
+    credentials: {
+        Servers: {
+            ManualAddress: string,
+            ManualAddressOnly: boolean,
+            IsLocalServer: boolean,
+            DateLastAccessed: number,
+            LastConnectionMode: number,
+            Type: string,
+            Name: string,
+            Id: string,
+            UserId: string | null,
+            AccessToken: string | null,
+            Users: {
+                UserId: string,
+                AccessToken: string,
+            }[]
+            LocalAddress: string,
+            RemoteAddress: string,
+        }[]
+    },
+    deviceId: string,
+    type: 'emby',
+} | {
+    credentials: {
+        Servers: {
+            ManualAddress: string,
+            manualAddressOnly: boolean,
+            DateLastAccessed: number,
+            LastConnectionMode: number,
+            Name: string,
+            Id: string,
+            UserId: string | null,
+            AccessToken: string | null,
+            LocalAddress: string,
+        }[]
+    },
+    deviceId: string,
+    type: 'jellyfin',
+} | undefined;
+
 class CredentialGenerator extends Component<Props> {
     ref = createRef<WebView>();
 
@@ -18,12 +59,18 @@ class CredentialGenerator extends Component<Props> {
 
     checkIfCredentialsAreThere = debounce(() => {
         // Inject some javascript to check if the credentials can be extracted
-        // from localstore
+        // from localstore. We simultaneously attempt to extract credentials for
+        // any back-end.
         this.ref.current?.injectJavaScript(`
             try { 
                 let credentials = JSON.parse(window.localStorage.getItem('jellyfin_credentials'));
                 let deviceId = window.localStorage.getItem('_deviceId2');
-                window.ReactNativeWebView.postMessage(JSON.stringify({ credentials, deviceId })) 
+                window.ReactNativeWebView.postMessage(JSON.stringify({ credentials, deviceId, type: 'jellyfin' })) 
+            } catch(e) { }; true;
+            try {  
+                let credentials = JSON.parse(window.localStorage.getItem('servercredentials3'));
+                let deviceId = window.localStorage.getItem('_deviceId2');
+                window.ReactNativeWebView.postMessage(JSON.stringify({ credentials, deviceId, type: 'emby' })) 
             } catch(e) { }; true;
         `);
     }, 500);
@@ -35,35 +82,71 @@ class CredentialGenerator extends Component<Props> {
         }
 
         // Parse the content
-        const data = JSON.parse(event.nativeEvent.data);
+        const data = JSON.parse(event.nativeEvent.data) as CredentialEventData;
+        if (__DEV__) {
+            console.log('Received credential event data: ', JSON.stringify(data));
+        }
 
-        if (!data.deviceId 
-            || !data.credentials?.Servers?.length 
-            || !data.credentials?.Servers[0]?.UserId 
-            || !data.credentials?.Servers[0]?.AccessToken) {
+        // Since Jellyfin and Emby are similar, we'll attempt to extract the
+        // credentials in a generic way.
+        let userId: string | undefined, accessToken: string | undefined;
+
+        // GUARD: Attempt to extract emby format credentials
+        if (data?.type === 'emby'
+            && data.credentials?.Servers?.length
+            && data.credentials?.Servers[0]?.Users?.length
+        ) {
+            userId = data.credentials.Servers[0].Users[0].UserId;
+            accessToken = data.credentials.Servers[0].Users[0].AccessToken;
+        // GUARD: Attempt to extract jellyfin format credentials
+        } else if (data?.type === 'jellyfin'
+            && data.credentials?.Servers?.length
+        ) {
+            userId = data.credentials.Servers[0].UserId || undefined;
+            accessToken = data.credentials.Servers[0].AccessToken || undefined;
+        }
+
+        // We can extract the deviceId and server address in the same way for
+        // both Jellyfin and Emby.
+        const deviceId = data?.deviceId;
+        const address = data?.credentials?.Servers?.length
+            && data?.credentials.Servers[0].ManualAddress;
+
+        // GUARD: log extract credentials in dev
+        if (__DEV__) {
+            console.log('Extracted the following credentials:', { userId, accessToken, deviceId, address });
+        }
+
+        // GUARD: Check that all the required credentials are available
+        if (!userId || !accessToken || !deviceId || !address) {
+            if (__DEV__) {
+                console.error('Failed to extract credentials from event');
+            }
             return;
         }
 
-        const { credentials: { Servers: [ credentials ] }, deviceId } = data;
-
         // Attempt to perform a request using the credentials to see if they're
         // good
-        const response = await fetch(`${credentials.ManualAddress}/Users/Me`, {
+        const response = await fetch(`${address}/Users/${userId}`, {
             headers: {
-                'X-Emby-Authorization': `MediaBrowser Client="", Device="", DeviceId="", Version="", Token="${credentials.AccessToken}"`
+                'X-Emby-Authorization': `MediaBrowser Client="", Device="", DeviceId="", Version="", Token="${accessToken}"`
             }
         });
 
         // GUARD: The request must succeed
         if (response.status !== 200) {
+            if (__DEV__) {
+                const body = await response.text();
+                console.error('Failed to retrieve user object using credentials:', response.status, body);
+            }
             return;
         }
 
         // If a message is received, the credentials should be there
         this.props.onCredentialsRetrieved({
-            uri: credentials.ManualAddress,
-            user_id: credentials.UserId,
-            access_token: credentials.AccessToken,
+            uri: address,
+            user_id: userId,
+            access_token: accessToken,
             device_id: deviceId,
         });
     };