So I'd like to write a new set of evaluators in Share based on the result of some repository webscripts.
The current existing Share evaluators are usable through some XML configuration and are related to Alfresco usual meta-data.
But, I'd like to know how to write my own Java evaluator while re using most of the logic already here (BaseEvaluator).
Suppose I have a repository webscript that returns some JSON like {"result" : "true"}:
How do I access it from my custom Evaluator? Mainly how do I access the proxy URL to alfresco webapp from the Spring context?
Do I need to write my own async call in Java?
Where do I find this JSONObject parameter of the required evaluate method?
thanks for your help
See if this helps. This goes into a class that extends BaseEvaluator. Wire the bean in through Spring, then set the evaluator on your actions.
public boolean evaluate(JSONObject jsonObject) {
boolean result = false;
final RequestContext rc = ThreadLocalRequestContext.getRequestContext();
final String userId = rc.getUserId();
try {
final Connector conn = rc.getServiceRegistry().getConnectorService().getConnector("alfresco", userId, ServletUtil.getSession());
final Response response = conn.call("/someco/example?echo=false");
if (response.getStatus().getCode() == Status.STATUS_OK) {
System.out.println(response.getResponse());
try {
org.json.JSONObject json = new org.json.JSONObject(response.getResponse());
result = Boolean.parseBoolean(((String) json.get("result")));
} catch (JSONException je) {
je.printStackTrace();
return false;
}
} else {
System.out.println("Call failed, code:" + response.getStatus().getCode());
return false;
}
} catch (ConnectorServiceException cse) {
cse.printStackTrace();
return false;
}
return result;
}
In this example I am using a simple example web script that echoes back your JSON and switches the result based on the value of the "echo" argument. So when it is called with "false", the JSON returns false and the evaluator returns false.
I should probably point out the name collision between the org.json.simple.JSONObject that the evaluate method expects and the org.json.JSONObject I am using to snag the result from the response JSON.
Related
I have dotnet WebAPI and I'm trying to get a specific behaviour but am constantly getting 415 responses.
I have reproduced this by starting a new webapi project using dotnet new webapi on the command line. From there, I added two things: a new controller, and a model class. In my real project the model class is obviously a bit more complex, with inheritance and methods etc...
Here they are:
[HttpGet("/data")]
public async Task<IActionResult> GetModel(BodyParams input)
{
var response = new { Message = "Hello", value = input.valueOne };
return Ok(response);
}
public class BodyParams {
public bool valueOne { get; set; } = true;
}
My goal is that the user can call https://localhost:7222/data with no headers or body needed at all, and will get the response - BodyParams will be used with the default value of true. Currently, from postman, or from the browser, I get a 415 response.
I've worked through several suggestions on stack and git but nothing seems to be working for me. Specifically, I have tried:
Adding [FromBody(EmptyBodyBehavior = EmptyBodyBehavior.Allow)] into the controller, but this makes no difference unless I provide an empty {} json object in the body. This is not what I want.
Making BodyParams nullable - again, no change.
Adding .AddControllers(opt => opt.AllowEmptyInputInBodyModelBinding = true)... again, no change.
I Implemented the solution suggested here using the attribute modification in the comment by #HappyGoLucky. Again, this did not give the desired outcome, but it did change the response to : 400 - "The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true."
I tried modifying the solution in (4) to manually set context.HttpContext.Request.Body to an empty json object... but I can't figure out the syntax for this because it need to be a byte array and at that point I feel like I am way over complicating this.
How can I get the controller to use BodyParams with default values in the case that the user provides no body and no headers at all?
You can achieve that using a Minimal API.
app.MapGet("/data",
async (HttpRequest httpRequest) =>
{
var value = true;
if (Equals(httpRequest.GetTypedHeaders().ContentType, MediaTypeHeaderValue.Parse("application/json")))
{
var bodyParams = await httpRequest.ReadFromJsonAsync<BodyParams>();
if (bodyParams is not null) value = bodyParams.ValueOne;
}
var response = new {Message = "Hello", value};
return Results.Ok(response);
});
So, as there doesn't seem to be a more straightforward answer, I have currently gone with the approach number 5) from the OP, and just tweaking the code from there very slightly.
All this does is act as an action which checks the if the user has passed in any body json. If not, then it adds in an empty anonymous type. The behaviour then is to use the default True value from the BodyParams class.
The full code for the action class is:
internal class AllowMissingContentTypeForEmptyBodyConvention : Attribute, IActionModelConvention
{
public void Apply(ActionModel action)
{
action.Filters.Add(new AllowMissingContentTypeForEmptyBodyFilter());
}
private class AllowMissingContentTypeForEmptyBodyFilter : IResourceFilter
{
public void OnResourceExecuting(ResourceExecutingContext context)
{
if (!context.HttpContext.Request.HasJsonContentType()
&& (context.HttpContext.Request.ContentLength == default
|| context.HttpContext.Request.ContentLength == 0))
{
context.HttpContext.Request.ContentType = "application/json";
var str = new { };
//convert string to jsontype
var json = JsonConvert.SerializeObject(str);
//modified stream
var requestData = Encoding.UTF8.GetBytes(json);
context.HttpContext.Request.Body = new MemoryStream(requestData);
}
}
public void OnResourceExecuted(ResourceExecutedContext context)
{
// Do nothing
}
}
}
Then you can add this to any of your controllers using [AllowMissingContentTypeForEmptyBodyConvention]
I am creating an app where user can upload their text file and find out about its most used word.
I have tried to follow this doc to get used to the idea of using AZURE STORAGE BLOBS - https://learn.microsoft.com/en-us/azure/storage/blobs/storage-quickstart-blobs-dotnet
But I am super newbie and having a hard time figuring it out how to adapt those blobs methods for my POST method.
This my sudo - what I think I need in my controller and what needs to happen when POST method is triggered.
a.No need for DELETE or PUT, not replacing the data nor deleting in this app
b.Maybe need a GET method, but as soon as POST method is triggered, it should pass the text context to the FE component
POST method
connect with azure storage account
if it is a first time of POST, create a container to store the text file
a. how can I connect with the existing container if the new container has already been made? I found this, but this is for the old CloudBlobContainer. Not the new SDK 12 version.
.GetContainerReference($"{containerName}");
upload the text file to the container
get the chosen file's text content and return
And here is my controller.
public class HomeController : Controller
{
private IConfiguration _configuration;
public HomeController(IConfiguration Configuration)
{
_configuration = Configuration;
}
public IActionResult Index()
{
return View();
}
[HttpPost("UploadText")]
public async Task<IActionResult> Post(List<IFormFile> files)
{
if (files != null)
{
try
{
string connectionString = Environment.GetEnvironmentVariable("AZURE_STORAGE_CONNECTION_STRING");
BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);
string containerName = "textdata" + Guid.NewGuid().ToString();
BlobContainerClient containerClient = await blobServiceClient.CreateBlobContainerAsync(containerName);
//Q. How to write a if condition here so if the POST method has already triggered and container already created, just upload the data. Do not create a new container?
string fileName = //Q. how to get the chosen file name and replace with newly assignmed name?
string localFilePath = //Q. how to get the local file path so I can pass on to the FileStream?
BlobClient blobClient = containerClient.GetBlobClient(fileName);
using FileStream uploadFileStream = System.IO.File.OpenRead(localFilePath);
await blobClient.UploadAsync(uploadFileStream, true);
uploadFileStream.Close();
string data = System.IO.File.ReadAllText(localFilePath, Encoding.UTF8);
//Q. If I use fetch('Home').then... from FE component, will it receive this data? in which form will it receive? JSON?
return Content(data);
}
catch
{
//Q. how to use storageExeption for the error messages
}
finally
{
//Q. what is suitable to execute in finally? return the Content(data) here?
if (files != null)
{
//files.Close();
}
}
}
//Q. what to pass on inside of the Ok() in this scenario?
return Ok();
}
}
Q1. How can I check if the POST method has been already triggered, and created the Container? If so how can I get the container name and connect to it?
Q2. Should I give a new assigned name to the chosen file? How can I do so?
Q3. How can I get the chosen file's name so I can pass in order to process Q2?
Q4. How to get the local file path so I can pass on to the FileStream?
Q5. How to return the Content data and pass to the FE? by using fetch('Home').then... like this?
Q6. How can I use storageExeption for the error messages
Q7. What is suitable to execute in finally? return the Content(data) here?
Q8. What to pass on inside of the Ok() in this scenario?
Any help is welcomed! I know I asked a lot of Qs here. Thanks a lot!
Update: add a sample code, you can modify it as per your need.
[HttpPost]
public async Task<IActionResult> SaveFile(List<IFormFile> files)
{
if (files == null || files.Count == 0) return Content("file not selected");
string connectionString = "xxxxxxxx";
BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);
string containerName = "textdata" + Guid.NewGuid().ToString();;
BlobContainerClient containerClient = blobServiceClient.GetBlobContainerClient(containerName);
containerClient.CreateIfNotExists();
foreach (var file in files)
{
//use this line of code to get file name
string fileName = Path.GetFileName(file.FileName);
BlobClient blobClient = containerClient.GetBlobClient(fileName);
//directly read file content
using (var stream = file.OpenReadStream())
{
await blobClient.UploadAsync(stream);
}
}
//other code
return View();
}
Original answer:
When using List<IFormFile>, you should use foreach code block to iterate each file in the list.
Q2. Should I give a new assigned name to the chosen file? How can I do
so?
If you want to keep the file original name, in the foreach statement like below:
foreach (var file in myfiles)
{
Path.GetFileName(file.FileName)
//other code
}
And if you want to assign a new file name when uploaded to blob storage, you should define the new name in this line of code: BlobClient blobClient = containerClient.GetBlobClient("the new file name").
Q3. How can I get the chosen file's name so I can pass in order to
process Q2?
refer to Q2.
Q4. How to get the local file path so I can pass on to the FileStream?
You can use code like this: string localFilePath = file.FileName; to get the path, and then combine with the file name. But there is a better way, you can directly use this line of code Stream uploadFileStream = file.OpenReadStream().
Q5. How to return the Content data and pass to the FE? by using
fetch('Home').then... like this?
Not clear what's it meaning. Can you provide more details?
Q6. How can I use storageExeption for the error messages
The storageExeption does not exist in the latest version, you should install the older one.
You can refer to this link for more details.
#Ivan's answer is what the documentation seems the recommend; however, I was having a strange issue where my stream was always prematurely closed before the upload had time to complete. To anyone else who might run into this problem, going the BinaryData route helped me. Here's what that looks like:
await using var ms = new MemoryStream();
await file.CopyToAsync(ms);
var data = new BinaryData(ms.ToArray());
await blobClient.UploadAsync(data);
In my Web API handler I need to get the name of the route that matched the request.
public class CurrentRequestMessageHandler : DelegatingHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
var route = request.GetRouteData().Route;
//now what?
return base.SendAsync(request, cancellationToken);
}
}
Currently there is no way to retrieve the route name of a route in Web API. You can take a look at the HttpRouteCollection source code here for more details. If route name is definitely required for your scenario, you could stick in the route name in the data tokens of a route. (note that currently attribute routing doesn't provide a way to access the data tokens)
Update - 6/23/2014
With latest improvements(5.2 RC) in the area of attribute routing, you can do something like following to insert route names into data tokens.
config.MapHttpAttributeRoutes(new CustomDefaultDirectRouteProvider());
public class CustomDefaultDirectRouteProvider : DefaultDirectRouteProvider
{
public override IReadOnlyList<RouteEntry> GetDirectRoutes(HttpControllerDescriptor controllerDescriptor,
IReadOnlyList<HttpActionDescriptor> actionDescriptors, IInlineConstraintResolver constraintResolver)
{
IReadOnlyList<RouteEntry> coll = base.GetDirectRoutes(controllerDescriptor, actionDescriptors, constraintResolver);
foreach(RouteEntry routeEntry in coll)
{
if (!string.IsNullOrEmpty(routeEntry.Name))
{
routeEntry.Route.DataTokens["Route_Name"] = routeEntry.Name;
}
}
return coll;
}
}
Access it like this:
reequest.GetRouteData().Route.DataTokens["Route_Name"]
It's perhaps a bit late to answer this, but I found myself in the same situation (that is I need to generate an URL while not having the corresponding IHttpRoute name). You can however generate an URL with just the Route and the HttpRequestMessage.
var parameters = new Dictionary{{"id" , 123}, {HttpRoute.HttpRouteKey, true}};
var path = Route.GetVirtualPath(request, parameters);
var uri = path.VirtualPath;
The important part is to add HttpRoute.HttpRouteKey to the parameters, if this value is not used GetVirtualPath returns null.
see code in HttpRoute.cs
// Only perform URL generation if the "httproute" key was specified. This allows these
// routes to be ignored when a regular MVC app tries to generate URLs. Without this special
// key an HTTP route used for Web API would normally take over almost all the routes in a
// typical app.
if (values != null && !values.Keys.Contains(HttpRouteKey, StringComparer.OrdinalIgnoreCase))
{
return null;
}
I am writing an MVC 4 application, and using Entity Framework 4.1. I have a validation question which I cannot seem to find the answer to.
Essentially, I have an Entity (object) called "Product" which contains a field "Name", which must follow strict naming conventions which are defined in a separate Entity called "NamingConvention". When the user enters a value, the system needs to check it against the rules established in the NamingConvention entity, and return an error if need be.
Where should this validation be done, and how? I need to check the NamingConvention entity when doing the validation, which means I would need a database context since I'm referencing a different entity. Is there any validation method which won't require me to create a new context? I was thinking of doing the validation in the Controller, since it already creates a data context, but this doesn't seem like the right place to do it.
Thanks for any help!
I have done things like this using a JQuery post (ajax) call from the webpage where the name is being entered. You then post (the value of name) to a method on your controller which can return a JSON value that contains a flag saying if the validation passed and also a message that you want to return to your user. For example :
Javascript in webpage :
$("#name").change(function () {
var nameVal = $(this).val();
$.post(getRoot() + "/NameController/ValidateName", { name: nameVal },
function (data) {
if (data.valid == "true") {
alert("A valid name was chosen");
} else
{
alert(data.message);
}
}, "json");
});
Controller (NameController) Code :
[HttpPost]
public ActionResult ValidateName(string name)
{
// actual validation carried out in a static utility class (Utils.IsNameValid)
// if you are loading the same validation rules from your table each time
// consider caching the data in the application cache or a static List.
bool nameIsValid = Utils.IsNameValid(name, out string ErrorMessage);
JsonResult result = new JsonResult();
result.Data = new { valid = (nameIsValid "true" : "false"), message = ErrorMessage };
return result;
}
I'm using EF 5 but believe you can use this method ... apologies in advance if I'm misleading you with this answer.
You could do the validation within your context (or a context decorator)
public override int SaveChanges()
{
var products = this.GetChangedProducts();
foreach (var product in products)
{
this.ValidateName(product);
}
return base.SaveChanges();
}
private IEnumerable<Product> GetChangedProducts()
{
return (
from entry in _context.ChangeTracker.Entries()
where entry.State != EntityState.Unchanged
select entry.Entity)
.OfType<Product>();
}
private void ValidateName(Product product)
{
//validate here
}
I'm trying to use WebRequest.RegisterPrefix to register a decorator IWebRequestCreate implementation with the intention being to add "debug" scenarios (like emulating different connectivity scenarios).
I'm using the Mango beta 2 SDK and the RegisterPrefix method always returns true when used with "http://" as a prefix (or "http" for that matter), but the registered IWebRequestCreate instance is not being used.
I can see from the documentation that it should return false for duplicates, but it doesn't seem to be functioning as documented.
Is there any other way of achieving what I'm after in a way that is transparent to consumers?
I'm using WebRequest.RegisterPrefix for unit testing, registering an IWebRequestCreate implementation for a prefix of test://, and this does work.
I found that after registering an IWebRequestCreate for http://, calling WebRequest.Create with an http:// uri would return a request created from the registered IWebRequestCreate, but calling WebRequest.CreateHttp would still return an HttpWebRequest.
The following code should verify this, and I'm using the Mango Beta 2 SDK (6-29-11):
public partial class MainPage : PhoneApplicationPage
{
public class FakeRequest : WebRequest
{
private Uri _uri;
public FakeRequest(Uri uri)
{
_uri = uri;
}
public override Uri RequestUri { get { return _uri; } }
}
public class FakeRequestFactory : IWebRequestCreate
{
public WebRequest Create(Uri uri)
{
return new FakeRequest(uri);
}
}
// Constructor
public MainPage()
{
InitializeComponent();
// returns System.Net.Browser.ClientHttpWebRequest
var request1 = WebRequest.Create("http://www.foo.com");
// returns System.Net.Browser.ClientHttpWebRequest
var request2 = WebRequest.CreateHttp("http://www.foo.com");
// returns true
bool result1 = WebRequest.RegisterPrefix("http://", new FakeRequestFactory());
// returns FakeRequest
var request3 = WebRequest.Create("http://www.foo.com");
// returns System.Net.Browser.ClientHttpWebRequest
var request4 = WebRequest.CreateHttp("http://www.foo.com");
// returns false
bool result2 = WebRequest.RegisterPrefix("http://", new FakeRequestFactory());
// returns false, as per the note in the documention
bool result3 = HttpWebRequest.RegisterPrefix("http://", new FakeRequestFactory());
}
}
Hey I know this question is 2 years old but I came across the same problem. I think you'll find that WebRequest.RegisterPrefix() does return false if you try to register http: (notice the single colon, no forward slashes). If I ever find a workaround, I'll try to remember to update this post.
EDIT
In my particular case I wanted to throw out System.Net.FtpWebRequest and roll my own FTP client implementation (because the framework's implementation sucks).
In order to do that, I used reflection (and a bunch of late binding tricks) to get the arraylist of registered prefix and remove the ones that are linked to the internal System.Net.FtpWebRequestCreator class.
I'm not sure if all of these APIs are available for windows phone, but here's what I did:
Type webRequest = typeof(System.Net.WebRequest);
Assembly system = Assembly.GetAssembly(webRequest);
Type ftpWebRequestCreator = system.GetType("System.Net.FtpWebRequestCreator");
ArrayList prefixList = (ArrayList)webRequest.GetProperty("PrefixList", BindingFlags.Static | BindingFlags.NonPublic).GetValue(null, null);
IEnumerator enumerator = prefixList.GetEnumerator();
while (enumerator != null && enumerator.MoveNext()) {
if (object.ReferenceEquals(enumerator.Current.Creator.GetType(), ftpWebRequestCreator)) {
prefixList.Remove(enumerator.Current);
if (System.Net.WebRequest.RegisterPrefix(enumerator.Current.Prefix, new CustomWebRequestCreator())) {
enumerator = null;
} else {
enumerator = prefixList.GetEnumerator();
}
}
}
// Now I can use Create() on the base class
System.Net.WebRequest myCustomWebRequest = System.Net.WebRequest.Create("ftp://example.com/public");
This works by finding all prefixes that are registered with FtpWebRequestCreator and replacing them with my own creator. It should be fairly straightforward to adapt this for http(s).
The phone only has a client stack so RegisterPrefix has no effect on the phone.