// makes a request to the specified URL using the given access token
// and parses the JSON response into a FileList object
public async Task <FileList> CallWebApiFileListAndProcessResultAsync(string webApiUrl, string accessToken)
{
if (string.IsNullOrEmpty(accessToken))
{
throw new Exception($"Invalid access token");
}
HttpResponseMessage response = await MakeHttpRequestAsync(webApiUrl, accessToken);
if (response.IsSuccessStatusCode)
{
FileList list = new FileList();
string json = await response.Content.ReadAsStringAsync();
// convert entire json response to object
JObject result = JObject.Parse(json);
// convert useful part of json reponse to array of file data
JArray children = (JArray)result["value"];
// for each file
for (int i = 0; i < children.Count; ++i)
{
JObject child = (JObject)children[i];
// make sure child is not actually a folder
if (!child.ContainsKey("folder"))
{
// pull each required piece of data
string name = (string)child["name"];
string id = (string)child["id"];
string type = (string)child["file"]["mimeType"];
string eTag = (string)child["eTag"];
long size = (long)child["size"];
// process result into file list object
list.AddLine(name, id, type, eTag, size);
}
}
return(list);
}
// throw an exception if the response has a failure status code
throw new Exception($"File list API call failed: {response.StatusCode}");
}
// filters a FileList object down to only files that do exist in the registry
// by looping through the File objects in the FileList and calling
// Eth function IsRegisteredFileId on each to determine whether to add it to the new filtered FileList
public async Task <FileList> OnlyRegistered(string registryAddress, FileList list)
{
FileList filtered = new FileList();
// for each file
for (int i = 0; i < list.NumFiles; ++i)
{
// check if the file has been registered
bool registered = await IsRegisteredFileId.SendRequestAsync(MyWeb3, registryAddress,
list.Files[i].FileId);
// if it has been registered, add to new list
if (registered)
{
filtered.AddLine(list.Files[i].Name, list.Files[i].FileId, list.Files[i].Type,
list.Files[i].Etag, list.Files[i].Size);
}
}
return(filtered);
}