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722 lines (646 loc) · 27.8 KB
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using System.Diagnostics;
using System.Text;
using System.Text.Json.Nodes;
using Npgsql;
using NpgsqlRest.HttpClientType;
namespace NpgsqlRest.Proxy;
/// <summary>
/// Handles forwarding HTTP requests to a proxy target and returning the response.
/// </summary>
public static class ProxyRequestHandler
{
private static readonly HttpClient SharedClient = new()
{
Timeout = Timeout.InfiniteTimeSpan // We handle timeout per-request
};
/// <summary>
/// HttpClient for self-referencing proxy calls (relative paths).
/// When set, relative URL proxy requests use this client (e.g., TestServer in-memory handler).
/// </summary>
private static HttpClient? _selfClient;
/// <summary>
/// Base URL for resolving relative proxy paths. Auto-detected from server addresses or set via ProxyOptions.SelfBaseUrl.
/// </summary>
internal static string? SelfBaseUrl { get; set; }
/// <summary>
/// Set a custom HttpClient for self-referencing proxy calls.
/// </summary>
internal static void SetSelfClient(HttpClient client)
{
_selfClient = client;
}
/// <summary>
/// Forward the incoming request to the proxy target and return the response.
/// </summary>
public static async Task<ProxyResponse> InvokeAsync(
HttpContext context,
RoutineEndpoint endpoint,
string? requestBody,
NpgsqlParameterCollection? parameters = null,
Dictionary<string, string>? userContextHeaders = null,
CancellationToken cancellationToken = default)
{
var startTimestamp = Stopwatch.GetTimestamp();
var proxyOptions = Options.ProxyOptions;
// Determine the target URL
var host = endpoint.ProxyHost ?? proxyOptions.Host;
if (string.IsNullOrEmpty(host))
{
return new ProxyResponse
{
StatusCode = 500,
IsSuccess = false,
ErrorMessage = "Proxy host is not configured. Set ProxyOptions.Host or specify host in proxy annotation."
};
}
// Resolve relative paths for self-referencing proxy calls
bool isSelfCall = host.StartsWith('/');
if (isSelfCall && _selfClient is null && SelfBaseUrl is not null)
{
host = string.Concat(SelfBaseUrl, host);
}
// Build the target URL with user claim parameters
var targetUrl = isSelfCall && _selfClient is not null
? BuildSelfTargetUrl(host)
: BuildTargetUrl(host, context.Request);
// Determine HTTP method
var method = endpoint.ProxyMethod?.ToString().ToUpperInvariant() ?? context.Request.Method;
// Forward server-filled HTTP Custom Type field params to the upstream the same way the
// endpoint takes its own parameters. Placement mirrors the endpoint, NOT the HTTP verb:
// - a param designated as the body parameter (@body_parameter_name) carries the raw body;
// - otherwise RequestParamType decides: BodyJson -> merged JSON body (when the proxy method
// can physically carry a JSON body), QueryString -> query string.
// Additive — the verbatim incoming request is still forwarded; this only adds filled values.
string? effectiveBody = requestBody;
var forwardParams = GetForwardableParams(endpoint, parameters);
if (forwardParams is not null)
{
var bodyParam = FindForwardableBodyParam(endpoint, forwardParams);
if (bodyParam is not null)
{
if (bodyParam.Value is not null && bodyParam.Value != DBNull.Value)
{
effectiveBody = bodyParam.Value.ToString();
}
forwardParams.Remove(bodyParam);
}
if (forwardParams.Count > 0)
{
bool mergeIntoBody = bodyParam is null
&& endpoint.RequestParamType == RequestParamType.BodyJson
&& HasRequestBody(method)
&& IsJsonContentType(context.Request.ContentType);
if (mergeIntoBody)
{
effectiveBody = MergeParamsIntoJsonBody(effectiveBody, forwardParams);
}
else
{
targetUrl = AppendParamsToQuery(targetUrl, forwardParams);
}
}
}
Logger?.LogDebug("Proxy starting {Method} request to '{Url}'", method, targetUrl);
try
{
// Use internal request handler for self-calls (bypasses HTTP stack entirely)
if (isSelfCall && InternalRequestHandler.IsAvailable)
{
// Build headers from the proxy request
Dictionary<string, string>? proxyHeaders = null;
if (proxyOptions.ForwardHeaders)
{
proxyHeaders = new();
foreach (var header in context.Request.Headers)
{
if (!string.Equals(header.Key, "Host", StringComparison.OrdinalIgnoreCase))
{
proxyHeaders[header.Key] = header.Value.ToString();
}
}
}
if (userContextHeaders is not null)
{
proxyHeaders ??= new();
foreach (var header in userContextHeaders)
{
proxyHeaders[header.Key] = header.Value;
}
}
var internalResponse = await InternalRequestHandler.ExecuteAsync(
method,
targetUrl,
proxyHeaders,
effectiveBody,
context.Request.ContentType,
cancellationToken);
var elapsed = Stopwatch.GetElapsedTime(startTimestamp);
Logger?.LogDebug("Internal proxy request to '{Url}' completed with status {StatusCode} in {Elapsed}ms",
targetUrl, internalResponse.StatusCode, elapsed.TotalMilliseconds.ToString("F1"));
return new ProxyResponse
{
StatusCode = internalResponse.StatusCode,
Body = internalResponse.Body,
RawBody = internalResponse.Body is not null ? Encoding.UTF8.GetBytes(internalResponse.Body) : null,
ContentType = internalResponse.ContentType,
Headers = internalResponse.Headers,
IsSuccess = internalResponse.IsSuccess
};
}
using var request = await CreateRequestAsync(context, method, targetUrl, effectiveBody, proxyOptions, userContextHeaders);
using var cts = CreateTimeoutCancellationTokenSource(proxyOptions.DefaultTimeout, cancellationToken);
var client = isSelfCall && _selfClient is not null ? _selfClient : SharedClient;
using var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cts?.Token ?? cancellationToken);
return await ProcessResponseAsync(response, proxyOptions, startTimestamp, targetUrl);
}
catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
{
var timeoutSeconds = proxyOptions.DefaultTimeout.TotalSeconds;
Logger?.LogWarning("Proxy request to '{Url}' timed out after {Timeout}s", targetUrl, timeoutSeconds);
return new ProxyResponse
{
StatusCode = 504, // Gateway Timeout
IsSuccess = false,
ErrorMessage = $"Proxy request timed out after {timeoutSeconds} seconds"
};
}
catch (HttpRequestException ex)
{
Logger?.LogError(ex, "Proxy request to '{Url}' failed with status {StatusCode}", targetUrl, ex.StatusCode);
return new ProxyResponse
{
StatusCode = (int?)ex.StatusCode ?? 502, // Bad Gateway
IsSuccess = false,
ErrorMessage = ex.Message
};
}
catch (Exception ex)
{
Logger?.LogError(ex, "Proxy request to '{Url}' failed with unexpected error", targetUrl);
return new ProxyResponse
{
StatusCode = 502, // Bad Gateway
IsSuccess = false,
ErrorMessage = ex.Message
};
}
}
/// <summary>
/// Build target URL for self-referencing proxy calls. Uses the host as the full path (no appending of request path).
/// </summary>
private static string BuildSelfTargetUrl(string host)
{
// For self-calls, host IS the full relative path (e.g., /api/hello-world)
// Don't append the incoming request path
return host;
}
private static string BuildTargetUrl(string host, HttpRequest request)
{
// Ensure host doesn't end with /
host = host.TrimEnd('/');
// Get the path and query string. Automatic (server-filled) parameters — user claims, IP,
// HTTP Custom Type fields, resolved-parameter expressions — are appended consistently by the
// unified forwarding step in InvokeAsync (query string or JSON body, per the endpoint shape).
var path = request.Path.Value ?? "";
var queryString = request.QueryString.Value ?? "";
return $"{host}{path}{queryString}";
}
private static bool IsJsonContentType(string? contentType) =>
contentType is not null && contentType.Contains("json", StringComparison.OrdinalIgnoreCase);
/// <summary>
/// True when a parameter is filled by the server (not supplied by the client) and so should be
/// forwarded to the proxy upstream the same way the endpoint receives it. All automatic parameter
/// sources are treated consistently: user claims, IP address, HTTP Custom Type fields (the expanded
/// per-field params on DB functions), and resolved-parameter expressions. Single-composite HTTP
/// params (SQL-file shape, CustomTypeName null) are not forwarded.
/// </summary>
private static bool IsAutomaticParam(RoutineEndpoint endpoint, NpgsqlRestParameter p)
{
if (p.IsFromUserClaims || p.IsIpAddress)
{
return true;
}
if (p.TypeDescriptor.CustomType is not null
&& p.TypeDescriptor.CustomTypeName is not null
&& HttpClientTypes.Definitions.ContainsKey(p.TypeDescriptor.CustomType))
{
return true;
}
if (endpoint.ResolvedParameterExpressions is not null
&& (endpoint.ResolvedParameterExpressions.ContainsKey(p.ActualName)
|| endpoint.ResolvedParameterExpressions.ContainsKey(p.ConvertedName)))
{
return true;
}
return false;
}
/// <summary>
/// The forwardable parameter (if any) designated as the request body parameter
/// (<c>@body_parameter_name</c>) — it carries the raw request body rather than a query/JSON field.
/// </summary>
private static NpgsqlRestParameter? FindForwardableBodyParam(RoutineEndpoint endpoint, List<NpgsqlRestParameter> parameters)
{
if (!endpoint.HasBodyParameter)
{
return null;
}
foreach (var p in parameters)
{
if (endpoint.IsBodyParameter(p))
{
return p;
}
}
return null;
}
/// <summary>
/// Collects all server-filled (automatic) parameters to forward to the proxy upstream.
/// </summary>
private static List<NpgsqlRestParameter>? GetForwardableParams(RoutineEndpoint endpoint, NpgsqlParameterCollection? parameters)
{
if (parameters is null)
{
return null;
}
List<NpgsqlRestParameter>? result = null;
for (var i = 0; i < parameters.Count; i++)
{
if (parameters[i] is NpgsqlRestParameter rp && IsAutomaticParam(endpoint, rp))
{
(result ??= []).Add(rp);
}
}
return result;
}
private static string AppendParamsToQuery(string url, List<NpgsqlRestParameter> parameters)
{
var maxLen = Options.ProxyOptions.MaxForwardedQueryParamLength;
var sb = new StringBuilder();
foreach (var p in parameters)
{
if (p.Value is null || p.Value == DBNull.Value)
{
continue;
}
var value = p.Value.ToString() ?? "";
// Guard: a large value (typically an HTTP Custom Type body/text field) cannot be carried
// in a query string — percent-encoding it produces an unusable request line that the
// upstream rejects (HTTP 414/431) or resets. Skip it and warn rather than build a doomed URL.
// To forward such a value, use a body-carrying proxy method (POST/PUT/PATCH).
if (maxLen > 0 && value.Length > maxLen)
{
Logger?.LogWarning(
"Proxy: skipping forwarded query parameter '{Name}' — value length {Length} exceeds ProxyOptions.MaxForwardedQueryParamLength ({Max}). " +
"Large values cannot be carried in a query string; use a body-carrying proxy method (POST/PUT/PATCH) to forward them in the request body.",
p.ConvertedName, value.Length, maxLen);
continue;
}
if (sb.Length > 0)
{
sb.Append('&');
}
sb.Append(Uri.EscapeDataString(p.ConvertedName));
sb.Append('=');
sb.Append(Uri.EscapeDataString(value));
}
if (sb.Length == 0)
{
return url;
}
return url.Contains('?') ? $"{url}&{sb}" : $"{url}?{sb}";
}
private static string MergeParamsIntoJsonBody(string? body, List<NpgsqlRestParameter> parameters)
{
JsonObject obj;
if (string.IsNullOrWhiteSpace(body))
{
obj = [];
}
else
{
try
{
obj = JsonNode.Parse(body) as JsonObject ?? [];
}
catch
{
obj = [];
}
}
foreach (var p in parameters)
{
obj[p.ConvertedName] = ToJsonNode(p);
}
return obj.ToJsonString();
}
// Typed JSON value for a server-filled HTTP-type field, following the field's declared type:
// numeric/boolean fields become JSON numbers/bools, json fields are embedded as JSON, the rest
// become JSON strings. The value was already typed by the HTTP-type fill (asText vs native).
private static JsonNode? ToJsonNode(NpgsqlRestParameter p)
{
var v = p.Value;
if (v is null || v == DBNull.Value)
{
return null;
}
if (p.TypeDescriptor.IsJson)
{
var s = v.ToString();
if (string.IsNullOrEmpty(s))
{
return null;
}
try { return JsonNode.Parse(s); }
catch { return JsonValue.Create(s); }
}
return v switch
{
bool b => JsonValue.Create(b),
int i => JsonValue.Create(i),
long l => JsonValue.Create(l),
short sh => JsonValue.Create((int)sh),
decimal dec => JsonValue.Create(dec),
double d => JsonValue.Create(d),
_ => JsonValue.Create(v.ToString())
};
}
private static async Task<HttpRequestMessage> CreateRequestAsync(
HttpContext context,
string method,
string targetUrl,
string? requestBody,
ProxyOptions proxyOptions,
Dictionary<string, string>? userContextHeaders)
{
var request = new HttpRequestMessage(new HttpMethod(method), targetUrl);
// Forward headers if enabled
if (proxyOptions.ForwardHeaders)
{
foreach (var header in context.Request.Headers)
{
if (proxyOptions.ExcludeHeaders.Contains(header.Key))
{
continue;
}
// Skip content headers - they'll be set with content
if (IsContentHeader(header.Key))
{
continue;
}
request.Headers.TryAddWithoutValidation(header.Key, header.Value.ToArray());
}
}
// Add user context headers (from UserContext feature)
if (userContextHeaders is not null)
{
foreach (var header in userContextHeaders)
{
request.Headers.TryAddWithoutValidation(header.Key, header.Value);
}
}
// Forward body for methods that support it
if (HasRequestBody(method))
{
var contentType = context.Request.ContentType;
var isMultipart = contentType?.StartsWith("multipart/", StringComparison.OrdinalIgnoreCase) == true;
// For multipart uploads when ForwardUploadContent is enabled, forward raw stream
if (isMultipart && proxyOptions.ForwardUploadContent)
{
context.Request.EnableBuffering();
context.Request.Body.Position = 0;
// Use StreamContent for efficient streaming without loading into memory
request.Content = new StreamContent(context.Request.Body);
if (!string.IsNullOrEmpty(contentType))
{
request.Content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse(contentType);
}
}
else if (!string.IsNullOrEmpty(requestBody))
{
request.Content = new StringContent(requestBody, Encoding.UTF8);
if (!string.IsNullOrEmpty(contentType))
{
request.Content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse(contentType);
}
}
else if (context.Request.ContentLength > 0)
{
// Read body from request if not already provided
context.Request.EnableBuffering();
context.Request.Body.Position = 0;
using var reader = new StreamReader(context.Request.Body, Encoding.UTF8, detectEncodingFromByteOrderMarks: false, leaveOpen: true);
var body = await reader.ReadToEndAsync();
if (!string.IsNullOrEmpty(body))
{
request.Content = new StringContent(body, Encoding.UTF8);
if (!string.IsNullOrEmpty(contentType))
{
request.Content.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse(contentType);
}
}
}
}
return request;
}
private static bool HasRequestBody(string method)
{
return method is "POST" or "PUT" or "PATCH";
}
private static bool IsContentHeader(string headerName)
{
return headerName.StartsWith("Content-", StringComparison.OrdinalIgnoreCase);
}
private static CancellationTokenSource? CreateTimeoutCancellationTokenSource(TimeSpan timeout, CancellationToken cancellationToken)
{
var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
cts.CancelAfter(timeout);
return cts;
}
private static async Task<ProxyResponse> ProcessResponseAsync(
HttpResponseMessage response,
ProxyOptions proxyOptions,
long startTimestamp,
string targetUrl)
{
var result = new ProxyResponse
{
StatusCode = (int)response.StatusCode,
IsSuccess = response.IsSuccessStatusCode,
ContentType = response.Content.Headers.ContentType?.ToString()
};
// Read body
result.RawBody = await response.Content.ReadAsByteArrayAsync();
result.Body = Encoding.UTF8.GetString(result.RawBody);
// Build headers
result.RawHeaders = new Dictionary<string, string[]>();
var headersJson = new StringBuilder();
headersJson.Append('{');
bool first = true;
foreach (var header in response.Headers)
{
result.RawHeaders[header.Key] = header.Value.ToArray();
if (!first) headersJson.Append(',');
first = false;
headersJson.Append(PgConverters.SerializeString(header.Key));
headersJson.Append(':');
headersJson.Append(PgConverters.SerializeString(string.Join(", ", header.Value)));
}
foreach (var header in response.Content.Headers)
{
result.RawHeaders[header.Key] = header.Value.ToArray();
if (!first) headersJson.Append(',');
first = false;
headersJson.Append(PgConverters.SerializeString(header.Key));
headersJson.Append(':');
headersJson.Append(PgConverters.SerializeString(string.Join(", ", header.Value)));
}
headersJson.Append('}');
result.Headers = headersJson.ToString();
var duration = Stopwatch.GetElapsedTime(startTimestamp);
Logger?.LogDebug("Proxy request to '{Url}' completed with status {StatusCode}, content-type: {ContentType}, body length: {BodyLength}, duration: {Duration}ms",
targetUrl, result.StatusCode, result.ContentType, result.Body?.Length ?? 0, duration.TotalMilliseconds);
return result;
}
/// <summary>
/// Forward the function result body to an upstream proxy target (proxy_out mode).
/// </summary>
public static async Task<ProxyResponse> InvokeOutAsync(
HttpContext context,
RoutineEndpoint endpoint,
byte[] functionBodyBytes,
CancellationToken cancellationToken = default)
{
var startTimestamp = Stopwatch.GetTimestamp();
var proxyOptions = Options.ProxyOptions;
var host = endpoint.ProxyOutHost ?? proxyOptions.Host;
if (string.IsNullOrEmpty(host))
{
return new ProxyResponse
{
StatusCode = 500,
IsSuccess = false,
ErrorMessage = "Proxy host is not configured. Set ProxyOptions.Host or specify host in proxy_out annotation."
};
}
bool isSelfCall = host.StartsWith('/');
if (isSelfCall && _selfClient is null && SelfBaseUrl is not null)
{
host = string.Concat(SelfBaseUrl, host);
}
string targetUrl;
if (isSelfCall && _selfClient is not null)
{
targetUrl = host; // relative path, _selfClient handles BaseAddress
}
else
{
host = host.TrimEnd('/');
var path = context.Request.Path.Value ?? "";
var queryString = context.Request.QueryString.Value ?? "";
targetUrl = $"{host}{path}{queryString}";
}
var method = endpoint.ProxyOutMethod?.ToString().ToUpperInvariant() ?? context.Request.Method;
Logger?.LogDebug("ProxyOut starting {Method} request to '{Url}'", method, targetUrl);
try
{
// Use internal request handler for self-calls (bypasses HTTP stack entirely)
if (isSelfCall && InternalRequestHandler.IsAvailable)
{
var bodyStr = functionBodyBytes.Length > 0 ? Encoding.UTF8.GetString(functionBodyBytes) : null;
var internalResponse = await InternalRequestHandler.ExecuteAsync(
method, targetUrl, null, bodyStr, "application/json", cancellationToken);
var elapsed = Stopwatch.GetElapsedTime(startTimestamp);
Logger?.LogDebug("Internal proxyOut request to '{Url}' completed with status {StatusCode} in {Elapsed}ms",
targetUrl, internalResponse.StatusCode, elapsed.TotalMilliseconds.ToString("F1"));
return new ProxyResponse
{
StatusCode = internalResponse.StatusCode,
Body = internalResponse.Body,
ContentType = internalResponse.ContentType,
Headers = internalResponse.Headers,
IsSuccess = internalResponse.IsSuccess
};
}
using var request = new HttpRequestMessage(new HttpMethod(method), targetUrl);
if (HasRequestBody(method) && functionBodyBytes.Length > 0)
{
request.Content = new ByteArrayContent(functionBodyBytes);
request.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/json") { CharSet = "utf-8" };
}
using var cts = CreateTimeoutCancellationTokenSource(proxyOptions.DefaultTimeout, cancellationToken);
var client = isSelfCall && _selfClient is not null ? _selfClient : SharedClient;
using var response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cts?.Token ?? cancellationToken);
return await ProcessResponseAsync(response, proxyOptions, startTimestamp, targetUrl);
}
catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
{
var timeoutSeconds = proxyOptions.DefaultTimeout.TotalSeconds;
Logger?.LogWarning("ProxyOut request to '{Url}' timed out after {Timeout}s", targetUrl, timeoutSeconds);
return new ProxyResponse
{
StatusCode = 504,
IsSuccess = false,
ErrorMessage = $"ProxyOut request timed out after {timeoutSeconds} seconds"
};
}
catch (HttpRequestException ex)
{
Logger?.LogError(ex, "ProxyOut request to '{Url}' failed with status {StatusCode}", targetUrl, ex.StatusCode);
return new ProxyResponse
{
StatusCode = (int?)ex.StatusCode ?? 502,
IsSuccess = false,
ErrorMessage = ex.Message
};
}
catch (Exception ex)
{
Logger?.LogError(ex, "ProxyOut request to '{Url}' failed with unexpected error", targetUrl);
return new ProxyResponse
{
StatusCode = 502,
IsSuccess = false,
ErrorMessage = ex.Message
};
}
}
/// <summary>
/// Write the proxy response directly to the HTTP context response.
/// Used when the routine has no proxy response parameters.
/// </summary>
public static async Task WriteResponseAsync(
HttpContext context,
ProxyResponse proxyResponse,
ProxyOptions proxyOptions,
CancellationToken cancellationToken = default)
{
context.Response.StatusCode = proxyResponse.StatusCode;
// Set content type
if (!string.IsNullOrEmpty(proxyResponse.ContentType))
{
context.Response.ContentType = proxyResponse.ContentType;
}
// Forward response headers if enabled
if (proxyOptions.ForwardResponseHeaders && proxyResponse.RawHeaders is not null)
{
foreach (var header in proxyResponse.RawHeaders)
{
if (proxyOptions.ExcludeResponseHeaders.Contains(header.Key))
{
continue;
}
// Skip content-type as it's set separately
if (string.Equals(header.Key, "Content-Type", StringComparison.OrdinalIgnoreCase))
{
continue;
}
context.Response.Headers.TryAdd(header.Key, header.Value);
}
}
// Write body
if (proxyResponse.RawBody is not null && proxyResponse.RawBody.Length > 0)
{
await context.Response.Body.WriteAsync(proxyResponse.RawBody, cancellationToken);
}
}
}
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