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Copy pathMiddlewareExtension.cs
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Copy pathMiddlewareExtension.cs
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964 lines (904 loc) · 44.8 KB
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using System.Collections.Frozen;
using System.Data;
using System.Net;
using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
using Npgsql;
using NpgsqlTypes;
using Microsoft.Extensions.Primitives;
using Microsoft.AspNetCore.Http.Extensions;
using NpgsqlRest.Defaults;
using static System.Net.Mime.MediaTypeNames;
using static NpgsqlRest.ParameterParser;
using Tuple = (
NpgsqlRest.Routine routine,
NpgsqlRest.RoutineEndpoint endpoint,
NpgsqlRest.IRoutineSourceParameterFormatter formatter
);
namespace NpgsqlRest;
public static class NpgsqlRestMiddlewareExtensions
{
public static IApplicationBuilder UseNpgsqlRest(this IApplicationBuilder builder, NpgsqlRestOptions options)
{
if (options.ConnectionString is null && options.ConnectionFromServiceProvider is false)
{
throw new ArgumentException("Connection string is null and ConnectionFromServiceProvider is false. Set the connection string or use ConnectionFromServiceProvider");
}
ILogger? logger = null;
if (options.Logger is not null)
{
logger = options.Logger;
}
else if (builder is WebApplication app)
{
var factory = app.Services.GetRequiredService<ILoggerFactory>();
if (factory is not null)
{
logger = factory.CreateLogger(options.LoggerName ?? typeof(NpgsqlRestMiddlewareExtensions).Namespace ?? "NpgsqlRest");
}
else
{
logger = app.Logger;
}
}
var dict = BuildDictionary(builder, options, logger);
var serviceProvider = builder.ApplicationServices;
if (dict.Count == 0)
{
return builder;
}
builder.Use(async (context, next) =>
{
var path = context.Request.Path.ToString();
if (!dict.TryGetValue(string.Concat(context.Request.Method, path), out Tuple[]? tupleArray))
{
if (path.EndsWith('/'))
{
if (!dict.TryGetValue(string.Concat(context.Request.Method, path[..^1]), out tupleArray))
{
await next(context);
return;
}
}
else
{
if (!dict.TryGetValue(string.Concat(context.Request.Method, path, '/'), out tupleArray))
{
await next(context);
return;
}
}
}
JsonObject? jsonObj = null;
IDictionary<string, JsonNode?> bodyDict = default!;
string? body = null;
var len = tupleArray.Length;
bool overloaded = len > 1;
for (var index = len - 1; index >= 0; index--)
{
var (routine, endpoint, formatter) = tupleArray[index];
if (!string.Equals(context.Request.Method, endpoint.Method.ToString(), StringComparison.OrdinalIgnoreCase))
{
continue;
}
if (overloaded)
{
if (endpoint.RequestParamType == RequestParamType.QueryString)
{
var count = endpoint.BodyParameterName is null ? context.Request.Query.Count : context.Request.Query.Count + 1;
if (routine.ParamCount != count)
{
continue;
}
}
else
{
if (jsonObj is null)
{
await ParseJsonBody();
if (jsonObj is null && routine.ParamCount > 0)
{
continue;
}
}
if (routine.ParamCount != (jsonObj?.Count ?? 0))
{
continue;
}
}
}
List<NpgsqlRestParameter> paramsList = new(routine.ParamCount);
bool hasNulls = false;
int? headerParameterIndex = null;
if (routine.ParamCount > 0)
{
if (endpoint.RequestParamType == RequestParamType.QueryString)
{
bool shouldContinue = false;
foreach (var key in context.Request.Query.Keys)
{
if (endpoint.ParamsNameHash.Contains(key) is false)
{
shouldContinue = true;
break;
}
}
if (shouldContinue)
{
continue;
}
int setCount = 0;
for (var i = 0; i < routine.ParamCount; i++)
{
string p = endpoint.ParamNames[i];
var descriptor = routine.ParamTypeDescriptor[i];
var parameter = new NpgsqlRestParameter
{
NpgsqlDbType = descriptor.ActualDbType,
ActualName = routine.ParamNames[i],
TypeDescriptor = descriptor
};
if (context.Request.Query.TryGetValue(p, out var qsValue))
{
if (TryParseParameter(ref qsValue, ref descriptor, ref parameter, endpoint.QueryStringNullHandling))
{
if (options.ValidateParameters is not null || options.ValidateParametersAsync is not null)
{
if (options.ValidateParameters is not null)
{
options.ValidateParameters(new(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: qsValue,
jsonBodyNode: null));
}
if (options.ValidateParametersAsync is not null)
{
await options.ValidateParametersAsync(new(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: qsValue,
jsonBodyNode: null));
}
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
paramsList.Add(parameter);
setCount++;
}
}
else
{
// set param endpoint.BodyParameterName here
if (endpoint.BodyParameterName is not null)
{
if (string.Equals(p, endpoint.BodyParameterName, StringComparison.Ordinal) ||
string.Equals(routine.ParamNames[i], endpoint.BodyParameterName, StringComparison.Ordinal))
{
await ParseJsonBody();
if (body is null)
{
parameter.Value = DBNull.Value;
}
else
{
StringValues bodyStringValues = body;
TryParseParameter(ref bodyStringValues, ref descriptor, ref parameter, endpoint.QueryStringNullHandling);
}
}
}
if (options.ValidateParameters is not null || options.ValidateParametersAsync is not null)
{
if (options.ValidateParameters is not null)
{
options.ValidateParameters(new(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: qsValue,
jsonBodyNode: null));
}
if (options.ValidateParametersAsync is not null)
{
await options.ValidateParametersAsync(new(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: qsValue,
jsonBodyNode: null));
}
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
if (parameter.Value is null)
{
if (endpoint.RequestHeadersMode == RequestHeadersMode.Parameter)
{
if (string.Equals(p, endpoint.RequestHeadersParameterName, StringComparison.Ordinal) ||
string.Equals(routine.ParamNames[i], endpoint.RequestHeadersParameterName, StringComparison.Ordinal))
{
headerParameterIndex = i;
}
}
}
if (parameter.Value is not null || headerParameterIndex is not null)
{
paramsList.Add(parameter);
setCount++;
}
else if (descriptor.HasDefault)
{
setCount++;
}
}
if (hasNulls is false && parameter?.Value == DBNull.Value)
{
hasNulls = true;
}
}
if (setCount != routine.ParamCount)
{
continue;
}
}
else
{
if (jsonObj is null)
{
await ParseJsonBody();
if (jsonObj is null)
{
continue;
}
}
bool shouldContinue = false;
foreach (var key in bodyDict.Keys)
{
if (endpoint.ParamsNameHash.Contains(key) is false)
{
shouldContinue = true;
break;
}
}
if (shouldContinue)
{
continue;
}
int setCount = 0;
for (var i = 0; i < endpoint.ParamNames.Length; i++)
{
string p = endpoint.ParamNames[i];
var descriptor = routine.ParamTypeDescriptor[i];
var parameter = new NpgsqlRestParameter
{
NpgsqlDbType = descriptor.ActualDbType,
ActualName = routine.ParamNames[i],
TypeDescriptor = descriptor
};
if (bodyDict.TryGetValue(p, out var value))
{
if (TryParseParameter(ref value, ref descriptor, ref parameter))
{
if (options.ValidateParameters is not null || options.ValidateParametersAsync is not null)
{
if (options.ValidateParameters is not null)
{
options.ValidateParameters(new ParameterValidationValues(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: null,
jsonBodyNode: value));
}
if (options.ValidateParametersAsync is not null)
{
await options.ValidateParametersAsync(new(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: null,
jsonBodyNode: value));
}
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
paramsList.Add(parameter);
setCount++;
}
}
else
{
if (options.ValidateParameters is not null || options.ValidateParametersAsync is not null)
{
if (options.ValidateParameters is not null)
{
options.ValidateParameters(new ParameterValidationValues(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: null,
jsonBodyNode: null));
}
if (options.ValidateParametersAsync is not null)
{
await options.ValidateParametersAsync(new ParameterValidationValues(
context,
routine,
parameter,
paramName: p,
typeDescriptor: descriptor,
requestParamType: endpoint.RequestParamType,
queryStringValues: null,
jsonBodyNode: null));
}
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
if (parameter.Value is null)
{
if (endpoint.RequestHeadersMode == RequestHeadersMode.Parameter)
{
if (string.Equals(p, endpoint.RequestHeadersParameterName, StringComparison.Ordinal) ||
string.Equals(routine.ParamNames[i], endpoint.RequestHeadersParameterName, StringComparison.Ordinal))
{
headerParameterIndex = i;
}
}
}
if (parameter.Value is not null || headerParameterIndex is not null)
{
paramsList.Add(parameter);
setCount++;
}
else if (descriptor.HasDefault)
{
setCount++;
}
}
if (hasNulls is false && parameter?.Value == DBNull.Value)
{
hasNulls = true;
}
}
if (setCount != routine.ParamCount)
{
continue;
}
}
}
if (endpoint.RequiresAuthorization && context.User?.Identity?.IsAuthenticated is false)
{
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
await context.Response.CompleteAsync();
return;
}
if (hasNulls && routine.IsStrict)
{
context.Response.StatusCode = (int)HttpStatusCode.NoContent;
await context.Response.CompleteAsync();
return;
}
string? headers = null;
if (endpoint.RequestHeadersMode != RequestHeadersMode.Ignore)
{
headers = "{";
var i = 0;
foreach (var header in context.Request.Headers)
{
if (i++ > 0)
{
headers = string.Concat(headers, ",");
}
var key = header.Key;
var value = header.Value.ToString();
headers = string.Concat(
headers,
PgConverters.SerializeString(ref key),
":",
PgConverters.SerializeString(ref value));
}
headers = string.Concat(headers, "}");
if (endpoint.RequestHeadersMode == RequestHeadersMode.Parameter)
{
if (headerParameterIndex.HasValue)
{
paramsList[headerParameterIndex.Value].Value = headers;
}
}
}
NpgsqlConnection? connection = null;
try
{
if (options.ConnectionFromServiceProvider)
{
using IServiceScope? scope = options.ConnectionFromServiceProvider ? serviceProvider.CreateScope() : null;
connection = scope?.ServiceProvider.GetRequiredService<NpgsqlConnection>();
}
else
{
connection = new(options.ConnectionString);
}
if (connection is null)
{
continue;
}
if (options.LogConnectionNoticeEvents && logger != null)
{
connection.Notice += (sender, args) =>
{
Logger.LogConnectionNotice(ref logger, ref args);
};
}
if (connection.State != ConnectionState.Open)
{
await connection.OpenAsync();
}
await using var command = connection.CreateCommand();
if (endpoint.RequestHeadersMode == RequestHeadersMode.Context)
{
command.CommandText = string.Concat("select set_config('request.headers','",headers,"',false)");
command.ExecuteNonQuery();
}
var shouldLog = options.LogCommands && logger != null;
StringBuilder? cmdLog = shouldLog ?
new(string.Concat("-- ", context.Request.Method, " ", context.Request.GetDisplayUrl(), Environment.NewLine)) :
null;
int paramCount = paramsList.Count;
string? commandText;
if (formatter.RefContext)
{
commandText = formatter.IsFormattable ?
formatter.FormatCommand(ref routine, ref paramsList, ref context) :
routine.Expression;
if (formatter.IsFormattable)
{
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
}
else
{
commandText = formatter.IsFormattable ?
formatter.FormatCommand(ref routine, ref paramsList) :
routine.Expression;
}
if (paramCount == 0 && formatter.IsFormattable is false)
{
if (formatter.RefContext)
{
commandText = string.Concat(commandText, formatter.AppendEmpty(ref context));
if (formatter.IsFormattable)
{
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
}
else
{
commandText = string.Concat(commandText, formatter.AppendEmpty());
}
}
else
{
for (var i = 0; i < paramCount; i++)
{
var parameter = paramsList[i];
command.Parameters.Add(parameter);
if (formatter.IsFormattable is false)
{
if (formatter.RefContext)
{
commandText = string.Concat(commandText,
formatter.AppendCommandParameter(ref parameter, ref i, ref paramCount, ref context));
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
else
{
commandText = string.Concat(commandText,
formatter.AppendCommandParameter(ref parameter, ref i, ref paramCount));
}
}
if (shouldLog && options.LogCommandParameters)
{
object value = parameter.NpgsqlValue!;
var p = FormatParam(ref value, ref routine.ParamTypeDescriptor[i]);
cmdLog!.AppendLine(string.Concat(
"-- $",
(i+1).ToString(),
" ", routine.ParamTypeDescriptor[i].OriginalType,
" = ",
p));
}
} // end for parameters
}
if (commandText is null)
{
await next(context);
return;
}
command.CommandText = commandText;
if (shouldLog)
{
Logger.LogEndpoint(ref logger, ref endpoint, cmdLog?.ToString() ?? "", command.CommandText);
}
if (endpoint.CommandTimeout.HasValue)
{
command.CommandTimeout = endpoint.CommandTimeout.Value;
}
//command callback
if (options.CommandCallbackAsync is not null)
{
await options.CommandCallbackAsync((routine, command, context));
if (context.Response.HasStarted || context.Response.StatusCode != (int)HttpStatusCode.OK)
{
return;
}
}
if (routine.IsVoid)
{
await command.ExecuteNonQueryAsync();
context.Response.StatusCode = (int)HttpStatusCode.NoContent;
await context.Response.CompleteAsync();
return;
}
else // end if (routine.IsVoid)
{
command.AllResultTypesAreUnknown = true;
await using var reader = await command.ExecuteReaderAsync();
if (routine.ReturnsSet == false && routine.ColumnCount == 1 && routine.ReturnsRecordType is false)
{
if (await reader.ReadAsync())
{
string? value = reader.GetValue(0) as string;
TypeDescriptor descriptor = routine.ColumnsTypeDescriptor[0];
if (endpoint.ResponseContentType is not null)
{
context.Response.ContentType = endpoint.ResponseContentType;
}
else if (descriptor.IsJson || descriptor.IsArray)
{
context.Response.ContentType = Application.Json;
}
else
{
context.Response.ContentType = Text.Plain;
}
if (endpoint.ResponseHeaders.Count > 0)
{
foreach ((string headerKey, StringValues headerValue) in endpoint.ResponseHeaders)
{
context.Response.Headers.Append(headerKey, headerValue);
}
}
context.Response.StatusCode = (int)HttpStatusCode.OK;
if (descriptor.IsArray && value is not null)
{
value = PgConverters.PgArrayToJsonArray(ref value, ref descriptor);
}
if (value is not null)
{
await context.Response.WriteAsync(value);
}
else
{
if (endpoint.TextResponseNullHandling == TextResponseNullHandling.NullLiteral)
{
await context.Response.WriteAsync("null");
}
else if (endpoint.TextResponseNullHandling == TextResponseNullHandling.NoContent)
{
context.Response.StatusCode = (int)HttpStatusCode.NoContent;
}
// else OK empty string
}
await context.Response.CompleteAsync();
return;
}
else
{
logger?.CouldNotReadCommand(command.CommandText, context.Request.Method, context.Request.Path);
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.CompleteAsync();
return;
}
}
else // end if (routine.ReturnsRecord == false)
{
if (endpoint.ResponseContentType is not null)
{
context.Response.ContentType = endpoint.ResponseContentType;
}
else
{
context.Response.ContentType = Application.Json;
}
if (endpoint.ResponseHeaders.Count > 0)
{
foreach (var (headerKey, headerValue) in endpoint.ResponseHeaders)
{
context.Response.Headers.Append(headerKey, headerValue);
}
}
context.Response.StatusCode = (int)HttpStatusCode.OK;
if (routine.ReturnsSet)
{
await context.Response.WriteAsync("[");
}
bool first = true;
var routineReturnRecordCount = routine.ColumnCount;
StringBuilder row = new();
ulong rowCount = 0;
while (await reader.ReadAsync())
{
rowCount++;
if (!first)
{
row.Append(',');
}
else
{
first = false;
}
for (var i = 0; i < routineReturnRecordCount; i++)
{
object value = reader.GetValue(i);
// AllResultTypesAreUnknown = true always returns string, except for null
string raw = value == DBNull.Value ? "" : (string)value;
if (routine.ReturnsUnnamedSet == false)
{
if (i == 0)
{
row.Append('{');
}
row.Append('\"');
row.Append(endpoint.ReturnRecordNames[i]);
row.Append("\":");
}
var descriptor = routine.ColumnsTypeDescriptor[i];
if (value == DBNull.Value)
{
row.Append("null");
}
else if (descriptor.IsArray && value is not null)
{
raw = PgConverters.PgArrayToJsonArray(ref raw, ref descriptor);
row.Append(raw);
}
else if ((descriptor.IsNumeric || descriptor.IsBoolean || descriptor.IsJson) && value is not null)
{
if (descriptor.IsBoolean)
{
if (string.Equals(raw, "t", StringComparison.Ordinal))
{
row.Append("true");
}
else if (string.Equals(raw, "f", StringComparison.Ordinal))
{
row.Append("false");
}
else
{
row.Append(raw);
}
}
else
{
// numeric and json
row.Append(raw);
}
}
else
{
if (descriptor.ActualDbType == NpgsqlDbType.Unknown)
{
row.Append(PgConverters.PgUnknownToJsonArray(ref raw));
}
else if (descriptor.NeedsEscape)
{
row.Append(PgConverters.SerializeString(ref raw));
}
else
{
if (descriptor.IsDateTime)
{
row.Append('\"');
row.Append(raw.Replace(' ', 'T'));
row.Append('\"');
}
else
{
row.Append('\"');
row.Append(raw);
row.Append('\"');
}
}
}
if (routine.ReturnsUnnamedSet == false && i == routine.ColumnCount - 1)
{
row.Append('}');
}
if (i < routine.ColumnCount - 1)
{
row.Append(',');
}
} // end for
if (options.BufferRows != 1 && rowCount % options.BufferRows == 0)
{
await context.Response.WriteAsync(row.ToString());
row.Clear();
}
} // end while
if (row.Length > 0)
{
await context.Response.WriteAsync(row.ToString());
}
if (routine.ReturnsSet)
{
await context.Response.WriteAsync("]");
}
await context.Response.CompleteAsync();
return;
} // end if (routine.ReturnsRecord == true)
} // end if (routine.IsVoid is false)
}
finally
{
if (connection is not null && options.ConnectionFromServiceProvider is false)
{
await connection.DisposeAsync();
}
}
}
await next(context);
return;
async Task ParseJsonBody()
{
if (jsonObj is null)
{
context.Request.EnableBuffering();
context.Request.Body.Position = 0;
if (body is null)
{
using var reader = new StreamReader(context.Request.Body, Encoding.UTF8, detectEncodingFromByteOrderMarks: false, leaveOpen: true);
body = await reader.ReadToEndAsync();
}
JsonNode? node;
try
{
node = JsonNode.Parse(string.IsNullOrWhiteSpace(body) ? "{}" : body);
}
catch (JsonException)
{
return;
}
try
{
jsonObj = node?.AsObject();
#pragma warning disable CS8600 // Converting null literal or possible null value to non-nullable type.
bodyDict = jsonObj?.ToDictionary();
#pragma warning restore CS8600 // Converting null literal or possible null value to non-nullable type.
}
catch (Exception e)
{
logger?.CouldNotParseJson(body, context.Request.Path, e.Message);
}
}
}
});
return builder;
}
private static FrozenDictionary<string, Tuple[]> BuildDictionary(
IApplicationBuilder builder,
NpgsqlRestOptions options,
ILogger? logger)
{
var dict = new Dictionary<string, List<Tuple>>();
foreach (var handler in options.EndpointCreateHandlers)
{
handler.Setup(builder, logger, options);
}
options.SourcesCreated(options.RoutineSources);
CommentsMode optionsCommentsMode = options.CommentsMode;
foreach (var source in options.RoutineSources)
{
if (source.CommentsMode.HasValue)
{
options.CommentsMode = source.CommentsMode.Value;
}
else
{
options.CommentsMode = optionsCommentsMode;
}
foreach (var (routine, formatter) in source.Read(options))
{
RoutineEndpoint? result = DefaultEndpoint.Create(routine, options, logger);
if (result is null)
{
continue;
}
if (options.EndpointCreated is not null)
{
result = options.EndpointCreated(routine, result.Value);
}
if (result is null)
{
continue;
}
RoutineEndpoint endpoint = result.Value;
var method = endpoint.Method.ToString();
if (endpoint.BodyParameterName is not null && endpoint.RequestParamType == RequestParamType.BodyJson)
{
endpoint = endpoint with { RequestParamType = RequestParamType.QueryString };
logger?.EndpointTypeChanged(method, endpoint.Url, endpoint.BodyParameterName);
}
var key = string.Concat(method, endpoint.Url);
List<Tuple> list = dict.TryGetValue(key, out var value) ? value : [];
list.Add((routine, endpoint, formatter));
dict[key] = list;
foreach (var handler in options.EndpointCreateHandlers)
{
handler.Handle(routine, endpoint);
}
if (options.LogEndpointCreatedInfo)
{
logger?.EndpointCreated(method, endpoint.Url);
}
}
}
if (options.EndpointsCreated is not null)
{
options.EndpointsCreated(dict.Values.SelectMany(x => x).Select(x => (x.routine, x.endpoint)).ToArray());
}
(Routine routine, RoutineEndpoint endpoint)[]? array = null;
foreach (var handler in options.EndpointCreateHandlers)
{
array ??= dict.Values.SelectMany(x => x).Select(x => (x.routine, x.endpoint)).ToArray();
handler.Cleanup(ref array);
handler.Cleanup();
}
return dict
.ToDictionary(
x => x.Key,
x => x.Value.ToArray())
.ToFrozenDictionary();
}
}
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