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Changing UMLS/VSAC API authentication
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| namespace Trifolia.DB.Migrations | ||
| { | ||
| using System; | ||
| using System.Data.Entity.Migrations; | ||
|
|
||
| public partial class umls : DbMigration | ||
| { | ||
| public override void Up() | ||
| { | ||
| AddColumn("dbo.user", "umlsApiKey", c => c.String(maxLength: 255)); | ||
| DropColumn("dbo.user", "umlsUsername"); | ||
| DropColumn("dbo.user", "umlsPassword"); | ||
| } | ||
|
|
||
| public override void Down() | ||
| { | ||
| AddColumn("dbo.user", "umlsPassword", c => c.String(maxLength: 255)); | ||
| AddColumn("dbo.user", "umlsUsername", c => c.String(maxLength: 255)); | ||
| DropColumn("dbo.user", "umlsApiKey"); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,113 +1,77 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.IO; | ||
| using System.Linq; | ||
| using System.Net; | ||
| using System.Text; | ||
| using System.Threading.Tasks; | ||
| using System.Xml; | ||
| using Trifolia.Config; | ||
| using Trifolia.Logging; | ||
|
|
||
| namespace Trifolia.Shared | ||
| { | ||
| public class UmlsHelper | ||
| { | ||
| private const string TGT_URL = "https://vsac.nlm.nih.gov/vsac/ws/Ticket"; | ||
| private const string TGT_BODY_FORMAT = "username={0}&password={1}"; | ||
|
|
||
| /// <summary> | ||
| /// Authenticates the user with the VSAC using the credentials specified. | ||
| /// </summary> | ||
| /// <param name="username">The VSAC username</param> | ||
| /// <param name="password">The VSAC password</param> | ||
| /// <returns>True if authenticated, otherwise false.</returns> | ||
| public static string Authenticate(string username, string password) | ||
| public static string GetTicketGrantingTicket(string apiKey) | ||
| { | ||
| HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(TGT_URL); | ||
| string body = string.Format(TGT_BODY_FORMAT, username, password); | ||
| byte[] rawBody = Encoding.UTF8.GetBytes(body); | ||
| webRequest.Method = "POST"; | ||
| webRequest.ContentType = "text/plain"; | ||
| webRequest.ContentLength = rawBody.Length; | ||
|
|
||
| using (var sw = webRequest.GetRequestStream()) | ||
| { | ||
| sw.Write(rawBody, 0, rawBody.Length); | ||
| } | ||
| string url = AppSettings.UMLSTicketGrantingTicketURL; | ||
| HttpWebRequest tgtRequest = (HttpWebRequest)HttpWebRequest.Create(url); | ||
| tgtRequest.Method = "POST"; | ||
| tgtRequest.ContentType = "application/x-www-form-urlencoded"; | ||
| tgtRequest.Accept = "application/xml"; | ||
|
|
||
| try | ||
| { | ||
| HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse(); | ||
|
|
||
| if (response.StatusCode == HttpStatusCode.OK) | ||
| using (StreamWriter sw = new StreamWriter(tgtRequest.GetRequestStream())) | ||
| { | ||
| using (StreamReader sr = new StreamReader(response.GetResponseStream())) | ||
| { | ||
| return sr.ReadToEnd(); | ||
| } | ||
| sw.Write("apikey=" + apiKey); | ||
| } | ||
| } | ||
| catch (WebException wex) | ||
| { | ||
| Log.For(typeof(UmlsHelper)).Error("Error authenticating with UMLS", wex); | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| public static bool ValidateCredentials(string username, string password) | ||
| { | ||
| string ticketGrantingTicket = Authenticate(username, password); | ||
| return !string.IsNullOrEmpty(ticketGrantingTicket); | ||
| } | ||
| HttpWebResponse tgtResponse = (HttpWebResponse)tgtRequest.GetResponse(); | ||
|
|
||
| public static bool ValidateLicense(string username, string password) | ||
| { | ||
| string licenseCode = AppSettings.UmlsLicenseCode; | ||
| string[] query = new string[] { | ||
| "user=" + Uri.EscapeDataString(username), | ||
| "password=" + Uri.EscapeDataString(password), | ||
| "licenseCode=" + Uri.EscapeDataString(licenseCode) | ||
| }; | ||
| string url = AppSettings.UmlsValidateUrl + "?" + string.Join("&", query); | ||
| HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(url); | ||
| webRequest.Method = "POST"; | ||
| webRequest.ContentType = "x-www-form-urlencoded"; | ||
| webRequest.Accept = "application/xml"; | ||
| if (tgtResponse.StatusCode != HttpStatusCode.Created) | ||
| return null; | ||
|
|
||
| var response = (HttpWebResponse) webRequest.GetResponse(); | ||
| string location = tgtResponse.GetResponseHeader("Location"); | ||
|
|
||
| if (response.StatusCode != HttpStatusCode.OK) | ||
| return false; | ||
| if (string.IsNullOrEmpty(location) || location.IndexOf("TGT") < 0) | ||
| return null; | ||
|
|
||
| using (StreamReader sr = new StreamReader(response.GetResponseStream())) | ||
| return location.Substring(location.IndexOf("TGT")); | ||
| } | ||
| catch | ||
| { | ||
| var responseContent = sr.ReadToEnd(); | ||
| bool isValid = false; | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| if (responseContent.StartsWith("\"") && responseContent.EndsWith("\"")) | ||
| responseContent = responseContent.Substring(0, responseContent.Length - 2); | ||
| public static string GetServiceTicket(string tgt) | ||
| { | ||
| HttpWebRequest serviceTicketRequest = (HttpWebRequest) HttpWebRequest.Create("https://utslogin.nlm.nih.gov/cas/v1/tickets/" + tgt); | ||
| serviceTicketRequest.Method = "POST"; | ||
| serviceTicketRequest.ContentType = "application/x-www-form-urlencoded"; | ||
|
|
||
| try | ||
| try | ||
| { | ||
| using (StreamWriter sw = new StreamWriter(serviceTicketRequest.GetRequestStream())) | ||
| { | ||
| XmlDocument doc = new XmlDocument(); | ||
| doc.LoadXml(responseContent); | ||
| sw.Write("service=http://umlsks.nlm.nih.gov"); | ||
| } | ||
|
|
||
| if (doc.DocumentElement.Name != "Result" || !Boolean.TryParse(doc.DocumentElement.InnerText, out isValid)) | ||
| { | ||
| Log.For(typeof(UmlsHelper)).Error("Unexpected response from UMLS validation service: {0}", responseContent); | ||
| return false; | ||
| } | ||
| HttpWebResponse stResponse = (HttpWebResponse)serviceTicketRequest.GetResponse(); | ||
|
|
||
| return isValid; | ||
| } | ||
| catch (Exception ex) | ||
| using (StreamReader sr = new StreamReader(stResponse.GetResponseStream())) | ||
| { | ||
| Log.For(typeof(UmlsHelper)).Error("Error validation UMLS license for {0}", ex, username); | ||
| return false; | ||
| return sr.ReadToEnd(); | ||
| } | ||
| } | ||
| catch | ||
| { | ||
| return null; | ||
| } | ||
| } | ||
|
|
||
| public static bool ValidateLicense(string apiKey) | ||
| { | ||
| string tgt = GetTicketGrantingTicket(apiKey); | ||
| if (string.IsNullOrEmpty(tgt)) return false; | ||
| string serviceTicket = GetServiceTicket(tgt); | ||
| return !string.IsNullOrEmpty(serviceTicket); | ||
| } | ||
| } | ||
| } |
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