Capture New Document

/// <summary>
/// Creates an empty document then uploads a file or "page" associated with the document
/// 
/// https://docs.hyland.com/Developer/IS/en_US/7.4/operations.html#call_Document_V3_POST-document
/// </summary>
/// <param name="Doc">Object containing the new document's metadata</param>
public static async Task<Document> CreateDocument(DocumentPost Doc)
{
    //Convert incoming JSON data to string
    string postData = JsonConvert.SerializeObject(Doc);

    //Create the new document getting its detail url from the response location header
    var NewDocURL = await PostRequestReturnLocationHeader(BaseURL + $"document", postData);

    //Creating the document returns the URL location but 
    //does not return any metadata so we need to go get it 
    var newDocData = await GetRequest(NewDocURL);
    var newDocObject = JsonConvert.DeserializeObject<Document>(newDocData);  //parse the JSON to object

    //grab a file to be used as a new page
    byte[] arr = System.IO.File.ReadAllBytes("C:/Users/nwelker/Documents/Projects/Perceptive-Content-API/Content/unnamed.tiff");

    //add the page to the new document using the new id we retrieved
    await AddPageToDocument(newDocObject.info.id, arr);

    //get the doc data again now that we have added a page
    newDocData = await GetRequest(NewDocURL);
    var json = JsonConvert.DeserializeObject<Document>(newDocData);

    return json;
}

/// <summary>
/// Helper for making a POST request to the Integration Server API
/// that returns the value of the resulting Location response header
/// </summary>
/// <param name="url">URL for this request</param>
/// <param name="postData">Data payload for this request, defaults to empty string</param>
/// <returns></returns>
private static async Task<string> PostRequestReturnLocationHeader(string url, string postData = null) //post data defaults to null
{
    try
    {
        //http client data persists so first we clear headers
        client.DefaultRequestHeaders.Clear();

        //API will default to returning XML if we do not 
        //specify the Accept header
        client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));

        //Retrieve the access token from memory and 
        //add it to the request as a custom header
        client.DefaultRequestHeaders.Add("X-IntegrationServer-Session-Hash", Token);

        //This line adds the post data and sets the content-type 
        //header to application/json
        var data = new StringContent(postData, Encoding.UTF8, "application/json");

        //Send the POST request
        HttpResponseMessage response = await client.PostAsync(url, data);

        //throws exception if not a success
        response.EnsureSuccessStatusCode();
        
        //Get the location header value
        var location = response.Headers.GetValues("Location").FirstOrDefault();

        return location;
    }
    catch (Exception e) //if anything goes wrong end the session
    {
        await CloseSession();
        throw;
    }
}

/// <summary>
/// Add a file or "page" to the given document.  Returns the newly updated
/// document object
/// 
/// </summary>
/// <param name="docID">ID of target document</param>
/// <param name="arr">Byte array for the file to be uploaded</param>
public static async Task<string> AddPageToDocument(string docID, byte[] arr)
{
    //upload a file or "page" to the given document, including the file and file name
    var retval = await UploadPage(BaseURL + $"document/{docID}/page", arr, "unnamed.tiff");

    return retval;
}

/// <summary>
/// Uploads a file or "page" associated with the given document.  Document id 
/// comes in as a part of the URL
/// </summary>
/// <param name="url">URL for the request, should include doc id</param>
/// <param name="file">Byte array derived from given file</param>
/// <param name="filename">Name of the given file</param>
/// <returns></returns>
public static async Task<string> UploadPage(string url, byte[] file, string filename)
{
    try
    {
        string responseFromServer = "";

        //http client data persists so first we clear headers
        client.DefaultRequestHeaders.Clear();

        //Integration API will default to returning XML if we do not 
        //specify the Accept header
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        //Always add token for auth
        client.DefaultRequestHeaders.Add("X-IntegrationServer-Session-Hash", Token);

        //Add special headers for file name and size
        client.DefaultRequestHeaders.Add("X-IntegrationServer-Resource-Name", filename);

        //File size should be the number of bytes to be uploaded
        client.DefaultRequestHeaders.Add("X-IntegrationServer-File-Size", file.Length.ToString());

        //add the byte array to the request 
        using (var content = new ByteArrayContent(file))
        {
            //set the proper content type
            content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                    
            //make the POST request
            var response = await client.PostAsync(url, content);

            //Read the server response text
            responseFromServer = await response.Content.ReadAsStringAsync();
        }

        return responseFromServer;
    }
    catch (Exception ex)
    {
        //Always close session on fail
        await CloseSession();

        throw;
    }
           
}

/// <summary>
/// Helper for making a POST request to Integration Server API
/// </summary>
/// <param name="url">URL for this request</param>
/// <param name="postData">Data payload for this request, defaults to empty string</param>
private static async Task<string> PostRequest(string url, string postData = "") //post data defaults to null
{
    try
    {
        //http client data persists so first we clear headers
        client.DefaultRequestHeaders.Clear();

        //API will default to returning XML if we do not 
        //specify the Accept header
        client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));

        //Retrieve the access token from memory and 
        //add it to the request as a custom header
        client.DefaultRequestHeaders.Add("X-IntegrationServer-Session-Hash", Token);

        //This line adds the post data and sets the content-type 
        //header to application/json
        var data = new StringContent(postData, Encoding.UTF8, "application/json");

        //Send the POST2 request
        HttpResponseMessage response = await client.PostAsync(url, data);

        //throws exception if not a success
        response.EnsureSuccessStatusCode();

        //Read the response text and return it
        string responseBody = await response.Content.ReadAsStringAsync();

        return responseBody;

    }
    catch (Exception e) //if anything goes wrong end the session
    {
        await CloseSession();
        throw;
    }
}