ionic FacebookConnectPlugin Addition

facebook.m

/**
  *The following mimics thefunctionality of showDialog in how to call the function but instead of using the method
  * to know what dialog to show we use the passed method name to check for that permssion e.g. "email". 
  */
  
// In www/facebook-native.js 
exports.checkPermissions = function checkPermissions (options, s, f) {
  exec(s, f, 'FacebookConnectPlugin', 'checkPermissions', [options])
}

// In src/ios/FacebookConnectPlugin.h
- (void) checkPermissions:(CDVInvokedUrlCommand*)command 

// In src/ios/FacebookConnectPlugin.m
-(void) checkPermissions:(CDVInvokedUrlCommand*)command
{
    
    //["email","user_friends","user_likes","user_birthday","user_photos”]

    if ([command.arguments count] == 0) {
        CDVPluginResult *pluginResult;
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR
                                         messageAsString:@"No method provided"];
        [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
        return;
    }
    
    NSMutableDictionary *options = [[command.arguments lastObject] mutableCopy];
    NSString* method = options[@"method"];
    if (!method) {
        CDVPluginResult *pluginResult;
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR
                                         messageAsString:@"No method provided"];
        [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
        return;
    }
    
    [options removeObjectForKey:@"method"];
    NSDictionary *params = [options copy];

    NSSet *grantedPermissions = [FBSDKAccessToken currentAccessToken].permissions; //gets current list of permissions
    
    for (NSString* key in params) {
        NSString value = [xyz objectForKey:key];
        
        if !([grantedPermissions containsObject:value]) { //checks if permissions exists
            CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR];
            [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
            return;
        }
        
    }
    
    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK];
    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
    return;
    
}