/// <summary>
/// Handles deleting existing data files. Requires authentication and a special privilege.
/// </summary>
/// <param name="shandler"></param>
/// <param name="request"></param>
/// <param name="body"></param>
/// <param name="encoder"></param>
/// <returns></returns>
public static async Task <Task> Action(ServerHandler shandler, HTTPRequest request, Stream body, IProxyHTTPEncoder encoder)
{
var auth_resp = await Helpers.ReadMessageFromStreamAndAuthenticate(shandler, 1024 * 16, body);
if (!auth_resp.success)
{
return(encoder.Response(403, "Denied").SendNothing());
}
if (!auth_resp.user.can_delete)
{
return(encoder.Response(403, "Denied").SendNothing());
}
var sreq = JsonConvert.DeserializeObject <DeleteRequest>(auth_resp.payload);
var sid = sreq.sid;
if (shandler.items.ContainsKey(sid))
{
var item = shandler.items[sid];
try
{
File.Delete(item.fqpath);
} catch (Exception)
{
await encoder.WriteQuickHeaderAndStringBody(
500, "Error", JsonConvert.SerializeObject(new DeleteResponse()
{
success = false,
})
);
return(Task.CompletedTask);
}
if (item.fqpath != null && item.fqpath.Length > 0)
{
shandler.UsedSpaceSubtract((long)item.datasize);
}
item.fqpath = null;
await shandler.WriteItemToJournal(item);
}
await encoder.WriteQuickHeaderAndStringBody(
200, "Deleted", JsonConvert.SerializeObject(new DeleteResponse()
{
success = true,
})
);
return(Task.CompletedTask);
}
/// <summary>
/// Handles reading header and data for data upload. A critical routine that employs as many checks as needed
/// to ensure that written data is verified as written and correct.
/// </summary>
/// <param name="shandler"></param>
/// <param name="request"></param>
/// <param name="body"></param>
/// <param name="encoder"></param>
/// <returns></returns>
public static async Task <Task> Action(ServerHandler shandler, HTTPRequest request, Stream body, IProxyHTTPEncoder encoder)
{
var buf = new byte[1024 * 32];
int bufndx = 0;
int cnt;
int tndx;
do
{
cnt = await body.ReadAsync(buf, bufndx, buf.Length - bufndx);
if (cnt > 0)
{
bufndx += cnt;
}
tndx = Array.IndexOf(buf, (byte)'\n');
if (bufndx >= buf.Length && tndx < 0)
{
throw new ProgramException("On receiving upload header. The header size exceeded 4096-bytes.");
}
} while (cnt > 0 && tndx < 0);
var hdrstr = Encoding.UTF8.GetString(buf, 0, tndx).Trim();
Debug.WriteLine(hdrstr);
var auth_package = JsonConvert.DeserializeObject <MDACS.API.Auth.Msg>(hdrstr);
var payload = auth_package.payload;
/*var info = await MDACS.API.Auth.AuthenticateMessageAsync(shandler.auth_url, auth_package);
*
* if (!info.success)
* {
* throw new UnauthorizedException();
* }
*/
var hdr = JsonConvert.DeserializeObject <MDACS.API.Requests.UploadHeader>(payload);
Array.Copy(buf, tndx + 1, buf, 0, bufndx - (tndx + 1));
// Quasi-repurpose the variable `bufndx` to mark end of the slack data.
bufndx = bufndx - (tndx + 1);
var data_node = String.Format("{0}_{1}_{2}_{3}.{4}",
hdr.datestr,
hdr.userstr,
hdr.devicestr,
hdr.timestr,
hdr.datatype
);
var data_node_path = Path.Combine(shandler.data_path, data_node);
// Make the name unique and keep pertinent information in the event something fails.
var temp_data_node_path = Path.Combine(
shandler.data_path,
$"temp_{DateTime.Now.ToFileTime().ToString()}_{data_node}"
);
// TODO: hash data then rehash data after writing to storage, maybe?
SHA512 hasher;
var fhash_sha512 = new byte[512 / 8];
FileStream fp = null;
try
{
#if DEBUG
//Logger.WriteDebugString($"Opening {temp_data_node_path} as temporary output for upload.");
#endif
fp = File.Open(temp_data_node_path, FileMode.Create);
await fp.WriteAsync(buf, 0, bufndx);
long total = 0;
hasher = SHA512Managed.Create();
hasher.Initialize();
while (true)
{
var _cnt = await body.ReadAsync(buf, 0, buf.Length);
if (_cnt < 1)
{
break;
}
Debug.WriteLine($"buf={buf} _cnt={_cnt}");
// https://stackoverflow.com/questions/20634827/how-to-compute-hash-of-a-large-file-chunk
hasher.TransformBlock(buf, 0, _cnt, null, 0);
total += _cnt;
await fp.WriteAsync(buf, 0, _cnt);
}
hasher.TransformFinalBlock(buf, 0, 0);
fhash_sha512 = hasher.Hash;
#if DEBUG
//Logger.WriteDebugString($"Wrote {total} bytes to {temp_data_node_path} as temporary output for upload.");
#endif
await body.CopyToAsync(fp);
await fp.FlushAsync();
fp.Dispose();
}
catch (Exception ex)
{
if (fp != null)
{
fp.Dispose();
}
#if DEBUG
//Logger.WriteDebugString($"Exception on {temp_data_node_path} with:\n{ex}");
#endif
File.Delete(temp_data_node_path);
await encoder.WriteQuickHeader(500, "Problem");
await encoder.BodyWriteSingleChunk("Problem during write to file from body stream.");
return(Task.CompletedTask);
}
#if DEBUG
//Logger.WriteDebugString($"Upload for {temp_data_node_path} is done.");
#endif
if (!await WaitForFileSizeMatch(temp_data_node_path, (long)hdr.datasize, 3))
{
File.Delete(temp_data_node_path);
await encoder.WriteQuickHeader(504, "Timeout");
await encoder.BodyWriteSingleChunk("The upload byte length of the destination never reached the intended stream size.");
return(Task.CompletedTask);
}
try
{
if (File.Exists(data_node_path))
{
await CheckedFileMoveAsync(data_node_path, $"{data_node_path}.moved.{DateTime.Now.ToFileTime().ToString()}");
}
await CheckedFileMoveAsync(temp_data_node_path, data_node_path);
}
catch (Exception)
{
// Delete the temporary since we should have saved the original.
File.Delete(temp_data_node_path);
// Move the original back to the original filename.
await CheckedFileMoveAsync($"{data_node_path}.moved.{DateTime.Now.ToFileTime().ToString()}", data_node_path);
await encoder.WriteQuickHeader(500, "Problem");
await encoder.BodyWriteSingleChunk("Unable to do a CheckFileMoveAsync.");
return(Task.CompletedTask);
}
if (!await WaitForFileSizeMatch(data_node_path, (long)hdr.datasize, 3))
{
await encoder.WriteQuickHeader(504, "Timeout");
await encoder.BodyWriteSingleChunk("Timeout waiting for size change.");
return(Task.CompletedTask);
}
Item item = new Item();
hasher = new SHA512Managed();
var security_id_bytes = hasher.ComputeHash(Encoding.UTF8.GetBytes(data_node));
item.datasize = hdr.datasize;
item.datatype = hdr.datatype;
item.datestr = hdr.datestr;
item.devicestr = hdr.devicestr;
item.duration = -1.0;
item.fqpath = data_node_path;
item.metatime = DateTime.Now.ToFileTimeUtc();
item.node = data_node;
item.note = "";
item.security_id = BitConverter.ToString(security_id_bytes).Replace("-", "").ToLower();
item.timestr = hdr.timestr;
item.userstr = hdr.userstr;
item.state = "";
item.manager_uuid = shandler.manager_uuid;
item.data_hash_sha512 = Convert.ToBase64String(fhash_sha512);
item.duration = MDACS.Database.MediaTools.MP4Info.GetDuration(item.fqpath);
await shandler.WriteItemToJournal(item);
var uresponse = new MDACS.API.Responses.UploadResponse();
uresponse.success = true;
uresponse.fqpath = item.fqpath;
uresponse.security_id = item.security_id;
shandler.UsedSpaceAdd((long)hdr.datasize);
await encoder.WriteQuickHeader(200, "OK");
await encoder.BodyWriteSingleChunk(JsonConvert.SerializeObject(uresponse));
// Allow current execution to continue while spinning off the
// a handler for this successful upload.
shandler.HouseworkAfterUploadSuccess(item);
return(Task.CompletedTask);
}
/// <summary>
///
/// </summary>
/// <param name="request"></param>
/// <param name="body"></param>
/// <param name="encoder"></param>
/// <exception cref="UnauthorizedException">User has insufficient priviledges to modify the item.</exception>
/// <exception cref="AuthenticationException">User is not valid for access of any type.</exception>
/// <exception cref="InvalidArgumentException">One of the arguments was not correct or the reason for failure.</exception>
/// <exception cref="ProgramException">Anything properly handled but needs handling for acknowlegement purposes.</exception>
/// <exception cref="Exception">Anything else could result in instability.</exception>
public static async Task <Task> Action(ServerHandler shandler, HTTPRequest request, Stream body, IProxyHTTPEncoder encoder)
{
var auth_resp = await Helpers.ReadMessageFromStreamAndAuthenticate(shandler, 1024 * 16, body);
if (!auth_resp.success)
{
throw new UnauthorizedException();
}
var sreq = JsonConvert.DeserializeObject <API.Requests.CommitSetRequest>(auth_resp.payload);
Monitor.Enter(shandler.items);
Item item;
#if DEBUG
//Logger.WriteDebugString($"sreq.security_id={sreq.security_id}");
#endif
try
{
if (!shandler.items.ContainsKey(sreq.security_id))
{
await encoder.WriteQuickHeader(404, "Not Found");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
item = shandler.items[sreq.security_id];
}
catch (Exception ex)
{
#if DEBUG
//Logger.WriteDebugString($"Exception on getting item was:\n{ex}");
#endif
await encoder.WriteQuickHeader(500, "Error");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
finally
{
Monitor.Exit(shandler.items);
}
if (!Helpers.CanUserModifyItem(auth_resp.user, item))
{
#if DEBUG
//Logger.WriteDebugString($"User was not authorized to write to item.");
#endif
await encoder.WriteQuickHeader(403, "Not Authorized");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
// Check fields to see if the user is authorized to modify them.
foreach (var pair in sreq.meta)
{
if (!await shandler.FieldModificationValidForUser(auth_resp.user, pair.Key))
{
await encoder.WriteQuickHeader(403, "Not Authorized");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
}
try
{
foreach (var pair in sreq.meta)
{
// Reflection simplified coding time at the expense of performance.
var field = item.GetType().GetField(pair.Key);
field.SetValue(item, pair.Value.ToObject(field.FieldType));
#if DEBUG
//Logger.WriteDebugString($"Set field {field} of {sreq.meta} to {pair.Value.ToString()}.");
#endif
}
shandler.items[sreq.security_id] = item;
if (!await shandler.WriteItemToJournal(item))
{
#if DEBUG
//Logger.WriteDebugString($"Error happened when writing to the journal for a commit set operation.");
#endif
await encoder.WriteQuickHeader(500, "Error");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
}
catch (Exception)
{
#if DEBUG
//Logger.WriteDebugString($"Error happened when writing to journal or setting item fields during commit set operation.");
#endif
await encoder.WriteQuickHeader(500, "Error");
await encoder.BodyWriteSingleChunk("");
return(Task.CompletedTask);
}
var resp = new MDACS.API.Responses.CommitSetResponse();
resp.success = true;
await encoder.WriteQuickHeader(200, "OK");
await encoder.BodyWriteSingleChunk(JsonConvert.SerializeObject(resp));
return(Task.CompletedTask);
}
public static async Task <Task> Action(ServerHandler shandler, HTTPRequest request, Stream body, IProxyHTTPEncoder encoder)
{
var auth = await Helpers.ReadMessageFromStreamAndAuthenticate(shandler, 1024 * 16, body);
if (!auth.success)
{
return(encoder.Response(403, "Denied").SendNothing());
}
var req = JsonConvert.DeserializeObject <HandleBatchSingleOpsRequest>(auth.payload);
var failed = new List <BatchSingleOp>();
var tasks = new List <Task <bool> >();
foreach (var op in req.ops)
{
var sid = op.sid;
var field_name = op.field_name;
if (!await shandler.FieldModificationValidForUser(auth.user, field_name))
{
return(encoder.Response(403, $"Denied Change On Field {field_name}").SendNothing());
}
}
foreach (var op in req.ops)
{
var sid = op.sid;
var field_name = op.field_name;
var value = op.value;
lock (shandler.items)
{
if (shandler.items.ContainsKey(sid))
{
try
{
var tmp = shandler.items[sid];
var field = tmp.GetType().GetField(field_name);
field.SetValue(tmp, value.ToObject(field.FieldType));
tasks.Add(shandler.WriteItemToJournal(tmp));
}
catch (Exception ex)
{
//Logger.WriteDebugString(
// $"Failed during batch single operation. The SID was {sid}. The field name was {field_name}. The value was {value}. The error was:\n{ex}"
//);
failed.Add(new BatchSingleOp()
{
field_name = field_name,
sid = sid,
value = value,
});
}
}
else
{
failed.Add(new BatchSingleOp()
{
field_name = field_name,
sid = sid,
value = value,
});
}
}
}
Task.WaitAll(tasks.ToArray());
var resp = new HandleBatchSingleOpsResponse();
resp.success = true;
resp.failed = failed.ToArray();
await encoder.Response(200, "OK")
.CacheControlDoNotCache()
.SendJsonFromObject(resp);
return(Task.CompletedTask);
}
