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      "body": "Cheers!\nhttps://www.linkedin.com/pulse/why-cant-i-react-facebook-deepak-gupta/\nhttps://www.merchantcircle.com/blogs/iblog-alfred-ny/2021/8/Heres-What-You-Need-To-Know-About-Facebook-Dating/2067841\nhttps://www.vingle.net/posts/3923955\nhttps://ed.ted.com/on/QJJ3cQKX#digdeeper\nhttps://ed.ted.com/on/dLR2jL0d#digdeeper\nhttps://www.open.edu/openlearncreate/mod/oublog/viewpost.php?post=2872\nhttps://mytrendingstories.com/den-mark/how-to-find-out-if-you-have-been-tagged-on-facebook-tqrtuw\nhttps://www.eudaimedia.com/?p=8115\nhttps://murmur.csail.mit.edu/thread?group_name=iNews&tid=38231\nhttps://writer.zohopublic.com/writer/published/dhko6ba4b11d7c47241bfab73939701228ba6\nhttps://writer.zohopublic.com/writer/published/dhko6c89da48926154d7688f19d8c07c22028\nhttps://lms.eonreality.com/eportfolios/12/Technology/How_To_Change_The_Language_On_Facebook\nhttps://techunwrapped.com/how-to-find-out-if-someone-has-unfollowed-you-on-facebook/\nhttps://androidcure.com/how-to-change-your-facebook-password/\nhttps://www.sbnation.com/users/Facebook%20Login%20Guide",
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      "body": "Thank you for the contribution. It has been approved.\n\nYou can contact us on [Discord](https://discord.gg/uTyJkNm).\n**[[utopian-moderator]](https://utopian.io/moderators)**",
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      "title": "How to create facebook login in ASP.NET Core Web API",
      "body": "\n#### What Will I Learn?\n\n- How to use Facebook API\n- How to create facebook login to your application\n- How to use JWT tokens\n\n#### Requirements\n\n- C#\n- ASP.NET Core\n- Visual Studio 2015+/ Visual Studio Code\n\n#### Difficulty\n\n- Intermediate\n\n#### Tutorial Contents\nIn this tutorial I will present how to create logic for Facebook login, using ASP.NET Core Web API. I will show you how to make full service and REST communication with another part application witch can be mobile application or web application. \n\nAt the beginning we have to create new project. I will create new ASP.NET Core 2.0 Web API project. I will show you how do it using Visual Studio 2017. \n<center>![project_1.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293291/z0namoxydsjhy5aetk7z.jpg)\n</center>\n\n<center>![project_2.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293312/icufd2b9w51azciobdy6.jpg)\n</center>\n\n### How will it work?\nWhen user click in the mobile application that he want to login by facebook, mobile application will send login request to facebook API,  when credentials are correctly he will receive accessToken from facebook, this token is sending to our API where our API will send to facebook API request for identify user by accessToken. If everything will be ok  facebook will return all information about particular user. Our service will create ours tokens and return this to mobile application. Since then mobile appplication will be using our access token for all request.\n\nIn the new project I will create new folder with 4 classes. It will be Resource classes, in this classes we will define the models, witch we will be receiving or sending by REST.\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293452/nfhcsswlvytkh3lkn4eo.png)\n</center>\n\nI created 4 classes:\n- FacebookLoginresource\n- FacebookUserResource\n- TokenResource\n- AuthorizationTokenResource\n\nFirst and second class will be used for facebook login, next 2 classes will be used for authorization particular user in our application using JWT Tokens.\n\nFacebookLoginResource: \n```\n    public class FacebookLoginResource\n    {\n        [Required]\n        [StringLength(255)]\n        public string facebookToken { get; set; }\n    }\n```\nFacebookUserResource\n```\n    public class FacebookUserResource\n    {\n        public string FirstName { get; set; }\n        public string LastName { get; set; }\n        public string Email { get; set; }\n        public string Picture { get; set; }\n    }\n```\n\nTokenResource\n```\n    public class TokenResource\n    {\n        public string Token { get; set; }\n        public long Expiry { get; set; }\n    }\n```\nAuthorizationTokenResource\n```\n    public class AuthorizationTokensResource\n    {\n        public TokenResource AccessToken { get; set; }\n        public TokenResource RefreshToken { get; set; }\n    }\n```\n\nNext step is creating a couple of services responsible for logic. I will create 3 service, one for communication with our mobile application, second for communication with facebook API, and third for creating JWT tokens.\n\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521294156/egahz4c37oqknfu96sih.png)\n</center>\n\nAccountService\n```\n public class AccountService\n    {\n        private readonly FacebookService _facebookService;\n        private readonly JwtHandler _jwtHandler;\n\n        public AccountService(FacebookService facebookService, JwtHandler jwtHandler)\n        {\n            _facebookService = facebookService;\n            _jwtHandler = jwtHandler;\n        }\n\n        public async Task<AuthorizationTokensResource> FacebookLoginAsync(FacebookLoginResource facebookLoginResource)\n        {\n            if (string.IsNullOrEmpty(facebookLoginResource.facebookToken))\n            {\n                throw new Exception(\"Token is null or empty\");\n            }\n\n            var facebookUser = await _facebookService.GetUserFromFacebookAsync(facebookLoginResource.facebookToken);\n            var domainUser = await unitOfWork.Users.GetAsync(facebookUser.Email);\n\n            return await CreateAccessTokens(domainUser, facebookLoginResource.DeviceId,\n                facebookLoginResource.DeviceName);\n        }\n\n        private async Task<AuthorizationTokensResource> CreateAccessTokens(User user, string deviceId,\n            string deviceName)\n        {\n            var accessToken = _jwtHandler.CreateAccessToken(user.Id, user.Email, user.Role);\n            var refreshToken = _jwtHandler.CreateRefreshToken(user.Id);\n\n            return new AuthorizationTokensResource { AccessToken = accessToken, RefreshToken = refreshToken };\n        }\n    }\n```\n\nFacebookService\n```\n    public class FacebookService\n    {\n        private readonly HttpClient _httpClient;\n\n        public FacebookService()\n        {\n            _httpClient = new HttpClient\n            {\n                BaseAddress = new Uri(\"https://graph.facebook.com/v2.8/\")\n            };\n            _httpClient.DefaultRequestHeaders\n                .Accept\n                .Add(new MediaTypeWithQualityHeaderValue(\"application/json\"));\n        }\n\n\n        public async Task<FacebookUserResource> GetUserFromFacebookAsync(string facebookToken)\n        {\n            var result = await GetAsync<dynamic>(facebookToken, \"me\", \"fields=first_name,last_name,email,picture.width(100).height(100)\");\n            if (result == null)\n            {\n                throw new Exception(\"User from this token not exist\");\n            }\n\n            var account = new FacebookUserResource()\n            {\n                Email = result.email,\n                FirstName = result.first_name,\n                LastName = result.last_name,\n                Picture = result.picture.data.url\n            };\n\n            return account;\n        }\n\n        private async Task<T> GetAsync<T>(string accessToken, string endpoint, string args = null)\n        {\n            var response = await _httpClient.GetAsync($\"{endpoint}?access_token={accessToken}&{args}\");\n            if (!response.IsSuccessStatusCode)\n                return default(T);\n\n            var result = await response.Content.ReadAsStringAsync();\n\n            return JsonConvert.DeserializeObject<T>(result);\n        }\n    }\n```\nJwtHandler\n```\npublic class JwtHandler\n    {\n        private readonly IConfiguration _configuration;\n\n        public JwtHandler(IConfiguration configuration)\n        {\n            _configuration = configuration;\n        }\n\n        public TokenResource CreateAccessToken(Guid userId, string email, Role role)\n        {\n            var now = DateTime.UtcNow;\n            var claims = new Claim[]\n            {\n            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.UniqueName, userId.ToString()),\n            new Claim(ClaimTypes.Email, email),\n            new Claim(ClaimTypes.Role, role.ToString()),\n            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),\n            new Claim(JwtRegisteredClaimNames.Iat, now.ToTimeStamp().ToString(), ClaimValueTypes.Integer64),\n            };\n\n            var signingCredentials = new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration[\"Tokens:Key\"])),\n                SecurityAlgorithms.HmacSha256);\n            var expiry = now.AddMinutes(double.Parse(_configuration[\"Tokens:AccessExpireMinutes\"]));\n            var jwt = CreateSecurityToken(claims, now, expiry, signingCredentials);\n            var token = new JwtSecurityTokenHandler().WriteToken(jwt);\n\n            return CreateTokenResource(token, expiry.ToTimeStamp());\n        }\n\n        public TokenResource CreateRefreshToken(Guid userId)\n        {\n            var now = DateTime.UtcNow;\n            var claims = new Claim[]\n            {\n            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.UniqueName, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),\n            new Claim(JwtRegisteredClaimNames.Iat, now.ToTimeStamp().ToString(), ClaimValueTypes.Integer64),\n            };\n\n            var signingCredentials = new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration[\"Tokens:Key\"])),\n                SecurityAlgorithms.HmacSha256);\n            var expiry = now.AddMinutes(double.Parse(_configuration[\"Tokens:RefreshExpireMinutes\"]));\n            var jwt = CreateSecurityToken(claims, now, expiry, signingCredentials);\n            var token = new JwtSecurityTokenHandler().WriteToken(jwt);\n\n            return CreateTokenResource(token, expiry.ToTimeStamp());\n        }\n\n        private JwtSecurityToken CreateSecurityToken(IEnumerable<Claim> claims, DateTime now, DateTime expiry, SigningCredentials credentials)\n            => new JwtSecurityToken(claims: claims, notBefore: now, expires: expiry, signingCredentials: credentials);\n\n        private static TokenResource CreateTokenResource(string token, long expiry)\n            => new TokenResource { Token = token, Expiry = expiry };\n    }\n```\nAccountService has 2 methods: \n- FacebookLogin\n- CreateAccessTokens\n\nFacebook Login method is taking facebookLoginresource as parameter, then check is facebokToken is null, next step is checking if user with this accesstoken exist in facebook. If everything is ok createaccess token method is calling.\n\nFacebookService has also 2 methods:\n- GetUserFromFacebook\n- GetAsync<T>\n\nfirst method is taking accessToken as parameter and is using this token to check if is in facebook exist user connected with this token. If facebook return basic information about this user is creating a facebookUser resource witch is returning to access token.\n\nJWTService has method responsible for creating JwtTokens, more information about it you can find in my other tutorial:\n[JwtTokens](https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api)\n\nLast part is creating a new Controller\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521295106/y3x8no59bid5uaplaovv.png)\n</center>\n\n```\n        private readonly AccountService _accountService;\n\n        public AccountController(AccountService accountService)\n        {\n            _accountService = accountService;\n        }\n\n        [HttpPost]\n        [Route(\"account/login/facebook\")]\n        public async Task<IActionResult> FacebookLoginAsync([FromBody] FacebookLoginResource resource)\n        {\n            var authorizationTokens = await _accountService.FacebookLoginAsync(resource);\n            return Ok(authorizationTokens);\n        }\n```\n\nThis controller has only one method for taking facebookLoginResource and returning a authorization tokens.\n\n\n#### Curriculum\n\n- [Saving image in database](https://utopian.io/utopian-io/@babelek/how-to-save-image-on-the-serwer-using-asp-net-core-2-0)\n- [Asp.Net Core with MSSql](https://utopian.io/utopian-io/@babelek/how-to-connect-asp-net-core-2-0-project-with-mssql-database-using-entity-framework-core)\n- [Email sending](https://utopian.io/utopian-io/@babelek/how-to-send-email-using-asp-net-core-2-0)\n- [Manage Refresh token](https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api)\n- [Custom error handling](https://utopian.io/utopian-io/@babelek/how-to-make-custom-error-handling-in-asp-net-core-2-0)\n    \n\n<br /><hr/><em>Posted on <a href=\"https://utopian.io/utopian-io/@babelek/how-to-create-facebook-login-in-asp-net-core-web-api\">Utopian.io -  Rewarding Open Source Contributors</a></em><hr/>",
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      "title": "How to create facebook login in ASP.NET Core Web API",
      "body": "\n#### What Will I Learn?\n\n- How to use Facebook API\n- How to create facebook login to your application\n- How to use JWT tokens\n\n#### Requirements\n\n- C#\n- ASP.NET Core\n- Visual Studio 2015+/ Visual Studio Code\n\n#### Difficulty\n\n- Intermediate\n\n#### Tutorial Contents\nIn this tutorial I will present how to create logic for Facebook login, using ASP.NET Core Web API. I will show you how to make full service and REST communication with another part application witch can be mobile application or web application. \n\nAt the beginning we have to create new project. I will create new ASP.NET Core 2.0 Web API project. I will show you how do it using Visual Studio 2017. \n<center>![project_1.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293291/z0namoxydsjhy5aetk7z.jpg)\n</center>\n\n<center>![project_2.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293312/icufd2b9w51azciobdy6.jpg)\n</center>\n\n### How will it work?\nWhen user click in the mobile application that he want to login by facebook, mobile application will send login request to facebook API,  when credentials are correctly he will receive accessToken from facebook, this token is sending to our API where our API will send to facebook API request for identify user by accessToken. If everything will be ok  facebook will return all information about particular user. Our service will create ours tokens and return this to mobile application. Since then mobile appplication will be using our access token for all request.\n\nIn the new project I will create new folder with 4 classes. It will be Resource classes, in this classes we will define the models, witch we will be receiving or sending by REST.\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293452/nfhcsswlvytkh3lkn4eo.png)\n</center>\n\nI created 4 classes:\n- FacebookLoginresource\n- FacebookUserResource\n- TokenResource\n- AuthorizationTokenResource\n\nFirst and second class will be used for facebook login, next 2 classes will be used for authorization particular user in our application using JWT Tokens.\n\nFacebookLoginResource: \n```\n    public class FacebookLoginResource\n    {\n        [Required]\n        [StringLength(255)]\n        public string facebookToken { get; set; }\n    }\n```\nFacebookUserResource\n```\n    public class FacebookUserResource\n    {\n        public string FirstName { get; set; }\n        public string LastName { get; set; }\n        public string Email { get; set; }\n        public string Picture { get; set; }\n    }\n```\n\nTokenResource\n```\n    public class TokenResource\n    {\n        public string Token { get; set; }\n        public long Expiry { get; set; }\n    }\n```\nAuthorizationTokenResource\n```\n    public class AuthorizationTokensResource\n    {\n        public TokenResource AccessToken { get; set; }\n        public TokenResource RefreshToken { get; set; }\n    }\n```\n\nNext step is creating a couple of services responsible for logic. I will create 3 service, one for communication with our mobile application, second for communication with facebook API, and third for creating JWT tokens.\n\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521294156/egahz4c37oqknfu96sih.png)\n</center>\n\nAccountService\n```\n public class AccountService\n    {\n        private readonly FacebookService _facebookService;\n        private readonly JwtHandler _jwtHandler;\n\n        public AccountService(FacebookService facebookService, JwtHandler jwtHandler)\n        {\n            _facebookService = facebookService;\n            _jwtHandler = jwtHandler;\n        }\n\n        public async Task<AuthorizationTokensResource> FacebookLoginAsync(FacebookLoginResource facebookLoginResource)\n        {\n            if (string.IsNullOrEmpty(facebookLoginResource.facebookToken))\n            {\n                throw new Exception(\"Token is null or empty\");\n            }\n\n            var facebookUser = await _facebookService.GetUserFromFacebookAsync(facebookLoginResource.facebookToken);\n            var domainUser = await unitOfWork.Users.GetAsync(facebookUser.Email);\n\n            return await CreateAccessTokens(domainUser, facebookLoginResource.DeviceId,\n                facebookLoginResource.DeviceName);\n        }\n\n        private async Task<AuthorizationTokensResource> CreateAccessTokens(User user, string deviceId,\n            string deviceName)\n        {\n            var accessToken = _jwtHandler.CreateAccessToken(user.Id, user.Email, user.Role);\n            var refreshToken = _jwtHandler.CreateRefreshToken(user.Id);\n\n            return new AuthorizationTokensResource { AccessToken = accessToken, RefreshToken = refreshToken };\n        }\n    }\n```\n\nFacebookService\n```\n    public class FacebookService\n    {\n        private readonly HttpClient _httpClient;\n\n        public FacebookService()\n        {\n            _httpClient = new HttpClient\n            {\n                BaseAddress = new Uri(\"https://graph.facebook.com/v2.8/\")\n            };\n            _httpClient.DefaultRequestHeaders\n                .Accept\n                .Add(new MediaTypeWithQualityHeaderValue(\"application/json\"));\n        }\n\n\n        public async Task<FacebookUserResource> GetUserFromFacebookAsync(string facebookToken)\n        {\n            var result = await GetAsync<dynamic>(facebookToken, \"me\", \"fields=first_name,last_name,email,picture.width(100).height(100)\");\n            if (result == null)\n            {\n                throw new Exception(\"User from this token not exist\");\n            }\n\n            var account = new FacebookUserResource()\n            {\n                Email = result.email,\n                FirstName = result.first_name,\n                LastName = result.last_name,\n                Picture = result.picture.data.url\n            };\n\n            return account;\n        }\n\n        private async Task<T> GetAsync<T>(string accessToken, string endpoint, string args = null)\n        {\n            var response = await _httpClient.GetAsync($\"{endpoint}?access_token={accessToken}&{args}\");\n            if (!response.IsSuccessStatusCode)\n                return default(T);\n\n            var result = await response.Content.ReadAsStringAsync();\n\n            return JsonConvert.DeserializeObject<T>(result);\n        }\n    }\n```\nJwtHandler\n```\npublic class JwtHandler\n    {\n        private readonly IConfiguration _configuration;\n\n        public JwtHandler(IConfiguration configuration)\n        {\n            _configuration = configuration;\n        }\n\n        public TokenResource CreateAccessToken(Guid userId, string email, Role role)\n        {\n            var now = DateTime.UtcNow;\n            var claims = new Claim[]\n            {\n            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.UniqueName, userId.ToString()),\n            new Claim(ClaimTypes.Email, email),\n            new Claim(ClaimTypes.Role, role.ToString()),\n            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),\n            new Claim(JwtRegisteredClaimNames.Iat, now.ToTimeStamp().ToString(), ClaimValueTypes.Integer64),\n            };\n\n            var signingCredentials = new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration[\"Tokens:Key\"])),\n                SecurityAlgorithms.HmacSha256);\n            var expiry = now.AddMinutes(double.Parse(_configuration[\"Tokens:AccessExpireMinutes\"]));\n            var jwt = CreateSecurityToken(claims, now, expiry, signingCredentials);\n            var token = new JwtSecurityTokenHandler().WriteToken(jwt);\n\n            return CreateTokenResource(token, expiry.ToTimeStamp());\n        }\n\n        public TokenResource CreateRefreshToken(Guid userId)\n        {\n            var now = DateTime.UtcNow;\n            var claims = new Claim[]\n            {\n            new Claim(JwtRegisteredClaimNames.Sub, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.UniqueName, userId.ToString()),\n            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),\n            new Claim(JwtRegisteredClaimNames.Iat, now.ToTimeStamp().ToString(), ClaimValueTypes.Integer64),\n            };\n\n            var signingCredentials = new SigningCredentials(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_configuration[\"Tokens:Key\"])),\n                SecurityAlgorithms.HmacSha256);\n            var expiry = now.AddMinutes(double.Parse(_configuration[\"Tokens:RefreshExpireMinutes\"]));\n            var jwt = CreateSecurityToken(claims, now, expiry, signingCredentials);\n            var token = new JwtSecurityTokenHandler().WriteToken(jwt);\n\n            return CreateTokenResource(token, expiry.ToTimeStamp());\n        }\n\n        private JwtSecurityToken CreateSecurityToken(IEnumerable<Claim> claims, DateTime now, DateTime expiry, SigningCredentials credentials)\n            => new JwtSecurityToken(claims: claims, notBefore: now, expires: expiry, signingCredentials: credentials);\n\n        private static TokenResource CreateTokenResource(string token, long expiry)\n            => new TokenResource { Token = token, Expiry = expiry };\n    }\n```\nAccountService has 2 methods: \n- FacebookLogin\n- CreateAccessTokens\n\nFacebook Login method is taking facebookLoginresource as parameter, then check is facebokToken is null, next step is checking if user with this accesstoken exist in facebook. If everything is ok createaccess token method is calling.\n\nFacebookService has also 2 methods:\n- GetUserFromFacebook\n- GetAsync<T>\n\nfirst method is taking accessToken as parameter and is using this token to check if is in facebook exist user connected with this token. If facebook return basic information about this user is creating a facebookUser resource witch is returning to access token.\n\nJWTService has method responsible for creating JwtTokens, more information about it you can find in my other tutorial:\n[JwtTokens](https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api)\n\nLast part is creating a new Controller\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1521295106/y3x8no59bid5uaplaovv.png)\n</center>\n\n```\n        private readonly AccountService _accountService;\n\n        public AccountController(AccountService accountService)\n        {\n            _accountService = accountService;\n        }\n\n        [HttpPost]\n        [Route(\"account/login/facebook\")]\n        public async Task<IActionResult> FacebookLoginAsync([FromBody] FacebookLoginResource resource)\n        {\n            var authorizationTokens = await _accountService.FacebookLoginAsync(resource);\n            return Ok(authorizationTokens);\n        }\n```\n\nThis controller has only one method for taking facebookLoginResource and returning a authorization tokens.\n\n\n#### Curriculum\n\n- [Saving image in database](https://utopian.io/utopian-io/@babelek/how-to-save-image-on-the-serwer-using-asp-net-core-2-0)\n- [Asp.Net Core with MSSql](https://utopian.io/utopian-io/@babelek/how-to-connect-asp-net-core-2-0-project-with-mssql-database-using-entity-framework-core)\n- [Email sending](https://utopian.io/utopian-io/@babelek/how-to-send-email-using-asp-net-core-2-0)\n- [Manage Refresh token](https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api)\n- [Custom error handling](https://utopian.io/utopian-io/@babelek/how-to-make-custom-error-handling-in-asp-net-core-2-0)\n    \n\n<br /><hr/><em>Posted on <a href=\"https://utopian.io/utopian-io/@babelek/how-to-create-facebook-login-in-asp-net-core-web-api\">Utopian.io -  Rewarding Open Source Contributors</a></em><hr/>",
      "json_metadata": "{\"community\":\"utopian\",\"app\":\"utopian/1.0.0\",\"format\":\"markdown\",\"repository\":{\"id\":17620347,\"name\":\"Home\",\"full_name\":\"aspnet/Home\",\"html_url\":\"https://github.com/aspnet/Home\",\"fork\":false,\"owner\":{\"login\":\"aspnet\"}},\"pullRequests\":[],\"platform\":\"github\",\"type\":\"tutorials\",\"tags\":[\"utopian-io\",\"utopina-io\",\"tutorial\",\"facebook\"],\"users\":[\"babelek\"],\"links\":[\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293291/z0namoxydsjhy5aetk7z.jpg\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293312/icufd2b9w51azciobdy6.jpg\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293452/nfhcsswlvytkh3lkn4eo.png\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521294156/egahz4c37oqknfu96sih.png\",\"https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521295106/y3x8no59bid5uaplaovv.png\",\"https://utopian.io/utopian-io/@babelek/how-to-save-image-on-the-serwer-using-asp-net-core-2-0\",\"https://utopian.io/utopian-io/@babelek/how-to-connect-asp-net-core-2-0-project-with-mssql-database-using-entity-framework-core\",\"https://utopian.io/utopian-io/@babelek/how-to-send-email-using-asp-net-core-2-0\",\"https://utopian.io/utopian-io/@babelek/how-to-make-custom-error-handling-in-asp-net-core-2-0\"],\"image\":[\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293291/z0namoxydsjhy5aetk7z.jpg\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293312/icufd2b9w51azciobdy6.jpg\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521293452/nfhcsswlvytkh3lkn4eo.png\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521294156/egahz4c37oqknfu96sih.png\",\"https://res.cloudinary.com/hpiynhbhq/image/upload/v1521295106/y3x8no59bid5uaplaovv.png\"]}"
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      "body": "### Hey @babelek I am @utopian-io. I have just upvoted you!\n#### Achievements\n- You have less than 500 followers. Just gave you a gift to help you succeed!\n- Seems like you contribute quite often. AMAZING!\n#### Suggestions\n- Contribute more often to get higher and higher rewards. I wish to see you often!\n- Work on your followers to increase the votes/rewards. I follow what humans do and my vote is mainly based on that. Good luck!\n#### Get Noticed!\n- Did you know project owners can manually vote with their own voting power or by voting power delegated to their projects? Ask the project owner to review your contributions!\n#### Community-Driven Witness!\nI am the first and only Steem Community-Driven Witness. <a href=\"https://discord.gg/zTrEMqB\">Participate on Discord</a>. Lets GROW TOGETHER!\n- <a href=\"https://v2.steemconnect.com/sign/account-witness-vote?witness=utopian-io&approve=1\">Vote for my Witness With SteemConnect</a>\n- <a href=\"https://v2.steemconnect.com/sign/account-witness-proxy?proxy=utopian-io&approve=1\">Proxy vote to Utopian Witness with SteemConnect</a>\n- Or vote/proxy on <a href=\"https://steemit.com/~witnesses\">Steemit Witnesses</a>\n\n[![mooncryption-utopian-witness-gif](https://steemitimages.com/DQmYPUuQRptAqNBCQRwQjKWAqWU3zJkL3RXVUtEKVury8up/mooncryption-s-utopian-io-witness-gif.gif)](https://steemit.com/~witnesses)\n\n**Up-vote this comment to grow my power and help Open Source contributions like this one. Want to chat? Join me on Discord https://discord.gg/Pc8HG9x**",
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      "title": "",
      "body": "Thank you for the contribution. It has been approved.\n\nYou can contact us on [Discord](https://discord.gg/uTyJkNm).\n**[[utopian-moderator]](https://utopian.io/moderators)**",
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      "permlink": "how-to-save-image-on-the-serwer-using-asp-net-core-2-0",
      "title": "How to save image on the serwer using ASP.NET Core 2.0",
      "body": "\n#### What Will I Learn?\n\n- You will learn how to correctly save image on the server using ASP.NET Core. I will show You how to save original image and his smaller copy. I will use avatar and thumbnail as example. What is more this tutorial will show you how to save image made directly from smartphone, set him correctly position and save, resize and delete old.\n\n#### Requirements\n\n- C#\n- ASP.NET\n- Visual Studio 2015+/Visual Studio Core\n\n#### Difficulty\n\n- Intermediate\n\n#### Tutorial Contents\nAt the beginning we have to create new project. I will create new ASP.NET Core 2.0 Web API project. I will show you how do it using Visual Studio 2017.\n![project_1.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516827765/g5iss7rsg77ehpsdgppx.jpg)\n\n![project_2.JPG](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516827769/bp77yqypijk4r5tlvtuc.jpg)\n\nIn the new project I will create new folder with one class. It will be ImageService class, in this class we will define the whole logic for image management.\n\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516828177/wz1psjildgfycqgtmcoj.png)\n</center>\n\nIn this service we have main function witch is: SaveImage. This function is define in this way:\n```\npublic async Task<string> SaveImage(User user, Stream imageStream)\n        {\n            if (imageStream == null || imageStream.Length == 0)\n            {\n                throw new ServiceException(ServiceErrorCodes.InvalidPhoto, \"There is no photo.\");\n            }\n\n            if (imageStream.Length > 5120000)\n            {\n                throw new ServiceException(ServiceErrorCodes.InvalidPhoto, \"Photo cannot be bigger than 5120000 bytes.\");\n            }\n\n            string[] photos;\n\n            try\n            {\n                photos = SetThumbnails(imageStream);\n            }\n            catch (ArgumentException)\n            {\n                throw new ServiceException(ServiceErrorCodes.InvalidPhoto, \"Invalid file format.\");\n            }\n\n            if (photos != null)\n            {\n                bool userHasThumbnail = user.WebThumbnail != null;\n                var oldPhoto = user.WebThumbnail;\n                var oldThumbnail = user.Thumbnail;\n                if (userHasThumbnail)\n                {\n                    DeletePhotoIfExist(oldPhoto);\n                    DeletePhotoIfExist(oldThumbnail);\n                }\n            }\n            return user.Thumbnail;\n        }\n```\nAs parameters take image as stream and user. User because we will save this image as his avatar.\nAt the beginning we have to check if stream i null or has no length, then if the image is too big.\n\nIn this function we have few more functions, the first one, and the most important is \"SetThumbnails()\"\n```\n public string[] SetThumbnails(Stream imageStream)\n        {\n            var originalImage = Image.FromStream(imageStream);\n\n            if (!ValidateImageFormat(originalImage))\n            {\n                throw new ArgumentException();\n            }\n\n            SetCorrectOrientation(originalImage);\n\n            var photoId = Guid.NewGuid().ToString();\n\n            var mobileThumbnail = $\"Content/Photos/Users/Thumbnails/500/{photoId}.jpg\";\n            var webThumbnail = $\"Content/Photos/Users/Thumbnails/100/{photoId}.jpg\";\n            CreateAndSaveThumbnail(originalImage, 500, mobileThumbnail);\n            CreateAndSaveThumbnail(originalImage, 100, webThumbnail);\n            originalImage.Dispose();\n\n            return new[] { webThumbnail, mobileThumbnail };\n        }\n```\nAs I said earlier we will validate our image if he has correctly format and right position.\n\nValidation image format:\n```\n private static bool ValidateImageFormat(Image image)\n        {\n            if (ImageFormat.Jpeg.Equals(image.RawFormat))\n            {\n                return true;\n            }\n            if (ImageFormat.Png.Equals(image.RawFormat))\n            {\n                return true;\n            }\n            if (ImageFormat.Gif.Equals(image.RawFormat))\n            {\n                return true;\n            }\n            if (ImageFormat.Bmp.Equals(image.RawFormat))\n            {\n                return true;\n            }\n            return false;\n        }\n```\nNow we have to  set correct image orientation, I'm using this function because photos made by samsung and directly save on the server are rotate about 90 degrees, I don't want to display photos like this, so I rotate them.\n```\nprivate static void SetCorrectOrientation(Image image)\n        {\n            //property id = 274 describe EXIF orientation parameter\n            if (Array.IndexOf(image.PropertyIdList, 274) > -1)\n            {\n                var orientation = (int)image.GetPropertyItem(274).Value[0];\n                switch (orientation)\n                {\n                    case 1:\n                        // No rotation required.\n                        break;\n                    case 2:\n                        image.RotateFlip(RotateFlipType.RotateNoneFlipX);\n                        break;\n                    case 3:\n                        image.RotateFlip(RotateFlipType.Rotate180FlipNone);\n                        break;\n                    case 4:\n                        image.RotateFlip(RotateFlipType.Rotate180FlipX);\n                        break;\n                    case 5:\n                        image.RotateFlip(RotateFlipType.Rotate90FlipX);\n                        break;\n                    case 6:\n                        image.RotateFlip(RotateFlipType.Rotate90FlipNone);\n                        break;\n                    case 7:\n                        image.RotateFlip(RotateFlipType.Rotate270FlipX);\n                        break;\n                    case 8:\n                        image.RotateFlip(RotateFlipType.Rotate270FlipNone);\n                        break;\n                }\n                // This EXIF data is now invalid and should be removed.\n                image.RemovePropertyItem(274);\n            }\n        }\n```\nIf we have correctly oriented photo we can save it.\n\n```\nprivate void CreateAndSaveThumbnail(Image image, int size, string thumbnailPath)\n        {\n            var thumbnailSize = GetThumbnailSize(image, size);\n\n            using (var bitmap = ResizeImage(image, thumbnailSize.Width, thumbnailSize.Height))\n            {\n                bitmap.Save(_serverPath.ServerPath + thumbnailPath, ImageFormat.Jpeg);\n            }\n        }\n```\n\nWe will save original and one smaller photo, so we have to resize it:\n```\nprivate static Size GetThumbnailSize(Image original, int size = 500)\n        {\n            var originalWidth = original.Width;\n            var originalHeight = original.Height;\n\n            double factor;\n            if (originalWidth > originalHeight)\n            {\n                factor = (double)size / originalWidth;\n            }\n            else\n            {\n                factor = (double)size / originalHeight;\n            }\n\n            return new Size((int)(originalWidth * factor), (int)(originalHeight * factor));\n        }\n```\n```\nprivate Bitmap ResizeImage(Image image, int width, int height)\n        {\n            var result = new Bitmap(width, height);\n\n            using (var graphics = Graphics.FromImage(result))\n            {\n                graphics.CompositingQuality = CompositingQuality.HighQuality;\n                graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;\n                graphics.SmoothingMode = SmoothingMode.HighQuality;\n\n                graphics.DrawImage(image, 0, 0, result.Width, result.Height);\n            }\n\n            return result;\n        }\n```\nNow we have complete logic for saving images, at the end I will show you how to delete photos from server:\n```\n        public void DeletePhotoIfExist(string photoPath)\n        {\n            if (photoPath == null) \n                throw new ArgumentNullException(nameof(photoPath));\n\n            if (File.Exists(Path.Combine(_serverPath.ServerPath, photoPath)))\n            {\n                File.Delete(Path.Combine(_serverPath.ServerPath, photoPath));\n            }\n        }\n```\nThis are all functions what ImageServis consist. If we want to save photo we have to create new Controller. I will name it ImageController:\n<center>![image.png](https://res.cloudinary.com/hpiynhbhq/image/upload/v1516829370/uknd34qlzns7ugx3ezsz.png)\n</center>\n\n```\npublic class ImageController1 : Controller\n    {\n        private readonly ImageService _imageService;\n\n        public ImageController1(ImageService imageService)\n        {\n            _imageService = imageService;\n        }\n\n        [HttpPost]\n        [Route(\"image\")]\n        public async Task<IActionResult> SaveImage(User user, IFormFile image)\n        {\n            var filePath = Path.GetTempFileName();\n\n            using (var stream = new FileStream(filePath, FileMode.Create))\n            {\n                await image.CopyToAsync(stream);\n                var avatar = _imageService.SaveImage(user, stream);\n            }\n\n            return Ok();\n        }\n    }\n```\n\nController has injected imageService using Dependency Injection. The Post method i taking as parametr IFormatFile, which is new interface from ASP.NET Core.\n\nThis is the end, now You know how to correctly save image using ASP.NET Core 2.0.\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n#### Curriculum\n\n- [Refresh Token](https://utopian.io/utopian-io/@babelek/how-to-manage-with-refresh-token-in-asp-net-core-2-0-web-api)\n- [Connection with MSSql](https://utopian.io/utopian-io/@babelek/how-to-connect-asp-net-core-2-0-project-with-mssql-database-using-entity-framework-core)\n- [Email sending](https://utopian.io/utopian-io/@babelek/how-to-send-email-using-asp-net-core-2-0)\n- [Custom Error Handling](https://utopian.io/utopian-io/@babelek/how-to-make-custom-error-handling-in-asp-net-core-2-0)\n    \n\n<br /><hr/><em>Posted on <a href=\"https://utopian.io/utopian-io/@babelek/how-to-save-image-on-the-serwer-using-asp-net-core-2-0\">Utopian.io -  Rewarding Open Source Contributors</a></em><hr/>",
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