使用OneDrive API的Azure功能会返回编译错误

Question

I want to create an Azure function (C# API Generic HTTP) method that uploads a file to an Office365 Sharepoint document library.
Because OneDrive API allows me to upload large files (using daemon process & certificate auth.), I have succeeded in achieving the goal with a C# Console Application. The idea would be now to move the code into an Azure function. However, I receive an error during save/compilation.

Code:

#r "Newtonsoft.Json"

using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System.Security.Cryptography.X509Certificates;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Threading.Tasks;

public class DriveResult
{
    [JsonProperty("@odata.id")]
    public string id { get; set; }

    [JsonProperty("name")]
    public string Name { get; set; }
}

const string appId = "<myAppId>";
const string tenantName = "<tenantName>";
const string tenantId = "<myTenantId>";


private static string GetResourceUrl()
{
    return "https://" + tenantName + ".sharepoint.com";
}

private static string GetAuthority()
{
    return "https://login.windows.net/" + tenantId + "/oauth2/authorize";
}

public static async Task<bool> Run(HttpRequestMessage req, TraceWriter log)
{
    var token = await GetAccessTokenAsync();
    return true; //temporary code
}

private static async Task<string> GetAccessTokenAsync()
{
    AuthenticationContext authenticationContext = new AuthenticationContext(GetAuthority(), false);
    string certfile = @"mykeyfile.pfx";

    X509Certificate2 cert = new X509Certificate2(certfile, "<myinsanepwd>");

    ClientAssertionCertificate cac = new ClientAssertionCertificate(appId, cert);
    var authenticationResult = await authenticationContext.AcquireTokenAsync("GetResourceUrl()", cac);
    return authenticationResult.AccessToken;
}

Project.json
{
  "frameworks": {
    "net46":{
      "dependencies": {
        "Microsoft.IdentityModel.Clients.ActiveDirectory": "3.13.5",
          "System.Security.Cryptography.X509Certificates": "4.1.0"
      }
    }
   }
}

Function.json
{
  "bindings": [
    {
      "authLevel": "function",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in"
    },
    {
      "name": "res",
      "type": "http",
      "direction": "out"
    }
  ],
  "disabled": false
}

Errors during compilation :

2016-10-22T13:05:24.625 run.csx(50,60): error CS0012: The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
2016-10-22T13:05:24.625 run.csx(50,38): error CS0012: The type 'Task<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Threading.Tasks, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

Why is it complaining? The functions runs on .NET 4.6.

Best regards, Jens

Answer 1

As an alternative, if you want to read/write from/to OneDrive or in fact any other file based SaaS provider such as DropBox, GoogleDrive, Box, ... you may want to try the SaaS File trigger, input or output in Azure functions.

Here is a C# sample:

https://github.com/Azure/azure-webjobs-sdk-templates/tree/dev/Templates/SaaSFileTrigger-CSharp

Answer 2

Jens,

This is an issue triggered by some cases when referencing PCLs.

We have a plan for a more permanent solution, but in the meantime, you should be able to compile your function by adding explicitly references to the assemblies you need as you've done with JSON.NET. So in your case, the following:

#r "System.Runtime"
#r "System.Threading.Tasks"

Hope this helps!