Add shared web credentials support (#40)

README.md

@@ -43,10 +43,10 @@ pod 'RNKeychain', :path => 'node_modules/react-native-keychain'
 See `KeychainExample` for fully working project example.
 
 ```js
-var Keychain = require('react-native-keychain');
+import * as Keychain from 'react-native-keychain';
 
-var username = 'zuck';
+let username = 'zuck';
-var password = 'poniesRgr8';
+let password = 'poniesRgr8';
 
 // Generic Password, service argument optional
 Keychain
@@ -91,6 +91,14 @@ Keychain
     console.log('Credentials successfully deleted');
   });
 
+Keychain
+  .requestSharedWebCredentials()
+  .then(function(credentials) {
+    if (credentials) {
+      console.log('Shared web credentials successfully loaded for user ' + credentials.username);
+    } 
+  })
+
 ```
 
 ### Android

RNKeychainManager/RNKeychainManager.m

@@ -215,4 +215,48 @@ RCT_EXPORT_METHOD(resetInternetCredentialsForServer:(NSString*)server callback:(
 
 }
 
+RCT_EXPORT_METHOD(requestSharedWebCredentials:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
+{
+  SecRequestSharedWebCredential(NULL, NULL, ^(CFArrayRef credentials, CFErrorRef error) {
+    if (error != NULL) {
+      NSError *nsError = (__bridge NSError *)error;
+      return reject([NSString stringWithFormat:@"%li", (long)nsError.code], nsError.description, nil);
+    }
+    
+    if (CFArrayGetCount(credentials) > 0) {
+      
+      CFDictionaryRef credentialDict = CFArrayGetValueAtIndex(credentials, 0);
+      NSString *server = (__bridge NSString *)CFDictionaryGetValue(credentialDict, kSecAttrServer);
+      NSString *username = (__bridge NSString *)CFDictionaryGetValue(credentialDict, kSecAttrAccount);
+      NSString *password = (__bridge NSString *)CFDictionaryGetValue(credentialDict, kSecSharedPassword);
+      
+      return resolve(@{
+        @"server": server,
+        @"username": username,
+        @"password": password
+      });
+    }
+    return resolve(@(NO));
+  });
+}
+
+
+RCT_EXPORT_METHOD(setSharedWebCredentialsForServer:(NSString*)server withUsername:(NSString*)username withPassword:(NSString*)password resolver:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
+{
+  SecAddSharedWebCredential(
+    (__bridge CFStringRef)server,
+    (__bridge CFStringRef)username,
+    (__bridge CFStringRef)password,
+    ^(CFErrorRef error)
+  {
+
+    if (error != NULL) {
+      NSError *nsError = (__bridge NSError *)error;
+      return reject([NSString stringWithFormat:@"%li", (long)nsError.code], nsError.description, nil);
+    }
+
+    resolve(@(YES));
+  });
+}
+
 @end

index.js

@@ -155,3 +155,30 @@ export function resetGenericPassword(
     });
   });
 }
+
+/**
+ * Asks the user for a shared web credential, resolves to `{ server, username, password }` if approved
+ * `false` if denied and throws an error if not supported on platform or there's no shared credentials.
+ * Returns a `Promise` object.
+ */
+export function requestSharedWebCredentials() : Promise {
+  if (Platform.OS !== 'ios') {
+    return Promise.reject(new Error(`requestSharedWebCredentials() is not supported on ${Platform.OS} yet`));
+  }
+  return RNKeychainManager.requestSharedWebCredentials();
+}
+
+/**
+ * Sets a shared web credential.
+ * Returns a `Promise` object.
+ */
+export function setSharedWebCredentials(
+  server: string,
+  username: string,
+  password: string
+) : Promise {
+  if (Platform.OS !== 'ios') {
+    return Promise.reject(new Error(`setSharedWebCredentials() is not supported on ${Platform.OS} yet`));
+  }
+  return RNKeychainManager.setSharedWebCredentialsForServer(server, username, password);
+}