SDK-753 update readme for sample apps for ios sdk

Author: skyflow-bharti

Samples/README.md

@@ -1,13 +1,118 @@
-Please follow these below steps to run samples
-
-- Navigate to the desired sample
-- In CMD, run the command, pod install
-- Open the .xcworkspace file using xcode
-- Click on Build and run
-
-`Note`:
-In every sample, in Skyflow.Config(), replace with the following fields:
-1. Replace the placeholder "<VAULT_ID>" with the correct vaultId you want to connect
-2. Replace the placeholder "<VAULT_URL>" with the correct vaultURL
-3. Implement the bearer token endpoint using server side auth SDK and service account file.
-   Replace the placeholder "<TOKEN_END_POINT_URL>" with the  bearer token endpoint which gives the bearerToken, implemented at your backend. 
+# iOS SDK samples
+Test the SDK by adding `VAULT-ID`, `VAULT-URL`, and `SERVICE-ACCOUNT` details in the required places for each sample.
+
+### Prerequisites
+- iOS 13.0.0 or higher
+- [cocoapods](https://cocoapods.org)
+- Xcode
+- [Node.js](https://nodejs.org/en/) 10 or higher
+- [npm](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) 6.x.x or higher
+
+- [express.js](http://expressjs.com/en/starter/hello-world.html)
+
+
+### Create the vault
+1.  In a browser, sign in to Skyflow Studio.
+2. Create a vault by clicking **Create Vault** > **Start With a Template** > **PIIData**.
+3. Once the vault is ready, click the gear icon and select **Edit Vault Details**.
+4. Note your **Vault URL** and **Vault ID** values, then click Cancel. You'll need these later.
+
+### Create a service account
+1. In the side navigation click, **IAM** > **Service Accounts** > **New Service Account**.
+2. For **Name**, enter "SDK Samples". For Roles, choose **Vault Editor**.
+3. Click **Create**. Your browser downloads a **credentials.json** file. Keep this file secure. You'll need it to generate bearer tokens.
+
+### Create a bearer token generation endpoint
+1. Create a new directory named `bearer-token-generator`.
+
+        mkdir bearer-token-generator
+2. Navigate to `bearer-token-generator` directory.
+
+        cd bearer-token-generator
+3. Initialize npm
+
+        npm init
+4. Install `skyflow-node`
+
+        npm i skyflow-node
+5. Move the downloaded “credentials.json” file #Create a service account account into the bearer-token-generator directory.
+6. Create `index.js` file
+7. Open `index.js` file
+8. populate `index.js` file with below code snippet
+```javascript
+const express = require("express");
+const app = express();
+const cors = require("cors");
+const port = 3000;
+const {
+   generateBearerToken,
+   isExpired
+} = require("skyflow-node");
+
+app.use(cors());
+
+let filepath = "credentials.json";
+let bearerToken = "";
+
+const getSkyflowBearerToken = () => {
+   return new Promise(async (resolve, reject) => {
+       try {
+           if (!isExpired(bearerToken)) {
+               resolve(bearerToken);
+           }
+           else {
+               let response = await generateBearerToken(filepath);
+               bearerToken = response.accessToken;
+               resolve(bearerToken);
+           }
+       } catch (e) {
+           reject(e);
+       }
+   });
+}
+app.get("/", async (req, res) => {
+ let bearerToken = await getSkyflowBearerToken();
+ res.json({"accessToken" : bearerToken});
+});
+
+app.listen(port, () => {
+ console.log(`Server is listening on port ${port}`);
+})
+```
+9. Start the server
+
+        node index.js
+    server will start at `localhost:3000`
+10. Your **<TOKEN_END_POINT_URL>** with `http://localhost:3000/`
+
+## The samples
+### Collect and reveal
+This sample demonstrates how to use Skyflow Elements to collect sensitive user information and reveal it to a user.
+#### Configure
+1. In `Skyflow.Configuration()` of [ViewController.swift](CollectAndRevealSample/CollectAndRevealSample/ViewController.swift), replace with the following fields:
+         - The placeholder "<VAULT_ID>" with the vault ID you noted previously.
+         - The placeholder "<VAULT_URL>" with the vault URL you noted previously.
+2. Replace the placeholder "<TOKEN_END_POINT_URL>" in [ExampleTokenProvider.swift](https://github.com/skyflowapi/skyflow-iOS/blob/SDK-753-update-sample-app-readme/Samples/CollectAndRevealSample/CollectAndRevealSample/ExampleTokenProvider.swift) with the service account bearer token endpoint.
+ 
+#### Running the sample
+    1. Open terminal
+    2. Navigate to CollectAndRevealSample
+    3. Run
+        pod install
+    4. Open the CollectAndRevealSample.xcworkspace file using xcode.
+    5. Build and run using command + R.
+    
+### Custom validation
+This sample demonstrates how to apply custom validation rules to Skyflow elements to restrict the type of input a user can provide.
+#### Configure
+In `Skyflow.Configuration()` of [ViewController.swift](Validations/Validations/ViewController.swift), replace with the following fields:
+1. Replace the placeholder "<VAULT_ID>" in the configuration with the vault ID previously noted. Replace the placeholder "<VAULT_URL>" with the vault URL previously noted.
+2. Replace the placeholder "<TOKEN_END_POINT_URL>" in [ExampleTokenProvider.swift](https://github.com/skyflowapi/skyflow-iOS/blob/SDK-753-update-sample-app-readme/Samples/Validations/Validations/ExampleTokenProvider.swift) with the service account bearer token endpoint.
+
+#### Running the sample
+      1. Open terminal
+      2. Navigate to Validations
+      3. Run       
+          pod install
+      4. Open the Validations.xcworkspace file using xcode
+      5. Build and run using command + R.