Office Web Apps–WOPI Host and url paths

If you’re following along with the post on creating a WOPI host, it’s never fully apparent that you MUST adhere to the path shown in the article here:

http://blogs.msdn.com/b/officedevdocs/archive/2013/03/20/introducing-wopi.aspx

That is, the path to your host must contain ‘/wopi/files’.  It wasn’t clear to me in that article, nor could I find it in the WOPI spec. http://msdn.microsoft.com/en-us/library/hh622722(v=office.12).aspx

So, for example, here are some Routes I used in MVC

 

            config.Routes.MapHttpRoute(
                name: "Contents",
                routeTemplate: "api/wopi/files/{name}/contents",
                defaults: new { controller = "files", action = "GetFile" }
                );

        config.Routes.MapHttpRoute(
            name: "FileInfo",
            routeTemplate: "api/wopi/files/{name}",
            defaults: new { controller = "Files", action = "Get" }
            );

 

 

Here are the Actions

public class FilesController : ApiController
    {

    IFileHelper _fileHelper;
    public FilesController() : this(new FileHelper())
    {

    }

    public FilesController(IFileHelper fileHelper)
    {
        _fileHelper = fileHelper;
    }


    /// <summary>
    /// Required for WOPI interface - on initial view
    /// </summary>
    /// <param name="name"></param>
    /// <param name="access_token"></param>
    /// <returns></returns>
    public CheckFileInfo Get(string name, string access_token)
    {
        var fileInfo = _fileHelper.GetFileInfo(name);
        return fileInfo;
    }


    /// <summary>
    /// Required for View WOPI interface - returns stream of document.
    /// </summary>
    /// <param name="name"></param>
    /// <param name="access_token"></param>
    /// <returns></returns>
    public HttpResponseMessage GetFile(string name, string access_token)
    {
        try
        {
            var file = HostingEnvironment.MapPath("~/App_Data/" + name);
            var rv = new HttpResponseMessage(HttpStatusCode.OK);
            var stream = new FileStream(file, FileMode.Open, FileAccess.Read);

            rv.Content = new StreamContent(stream);
            rv.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            return rv;

        }
        catch (Exception ex)
        {
            var rv = new HttpResponseMessage(HttpStatusCode.InternalServerError);
            var stream = new MemoryStream(UTF8Encoding.Default.GetBytes(ex.Message ?? ""));
            rv.Content = new StreamContent(stream);
            return rv;
        }
    }





}</pre></div>



 


And here is the helper


 


    public interface IFileHelper
    {
        CheckFileInfo GetFileInfo(string name);
    }

public class FileHelper : IFileHelper
{
    public CheckFileInfo GetFileInfo(string name)
    {
        var fileName = GetFileName(name);
        FileInfo info = new FileInfo(fileName);
        string sha256 = "";

        using (FileStream stream = File.OpenRead(fileName))
        using (var sha = SHA256.Create())
        {
            byte[] checksum = sha.ComputeHash(stream);
            sha256 = Convert.ToBase64String(checksum);
        }

        var rv = new CheckFileInfo
        {
            BaseFileName = info.Name,
            OwnerId = "admin",
            Size = (int)info.Length,
            SHA256 = sha256,
            Version = DateTime.Now.ToString("s")
        };

        return rv;
    }


    internal string GetFileName(string name)
    {
        var file = HostingEnvironment.MapPath("~/App_Data/" + name);
        return file;
    }
}</pre></div>

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