A helper function to stub network requests

README.md

A helper function to stub network requests with OHHTTPStubs using raw response recorded with curl -is.

Inspired by the feature of Nocilla to stub raw responses recorded with curl -is and this gist by Denis Lebedev.

gistfile1.m

/// File at `rawResponseFilePath` contains a response recorded using `curl -is`
/// so we could read response headers and body from it.
void StubNetworkRequest(NSString *httpMethod, NSString *httpPath, NSString *rawResponseFilePath)
{
  NSData *rawResponseData = [NSData dataWithContentsOfFile:rawResponseFilePath];

  __block NSInteger statusCode = 0;
  __block NSDictionary *headers;
  __block NSData *body;

  CFHTTPMessageRef httpMessage = CFHTTPMessageCreateEmpty(kCFAllocatorDefault, FALSE);
  if (httpMessage) {
    CFHTTPMessageAppendBytes(httpMessage, [rawResponseData bytes], [rawResponseData length]);

    if (CFHTTPMessageIsHeaderComplete(httpMessage)) {
      statusCode = (NSInteger)CFHTTPMessageGetResponseStatusCode(httpMessage);
      headers = (__bridge_transfer NSDictionary *)CFHTTPMessageCopyAllHeaderFields(httpMessage);
      body = (__bridge_transfer NSData *)CFHTTPMessageCopyBody(httpMessage);
    }
    CFRelease(httpMessage);
  }

  [OHHTTPStubs stubRequestsPassingTest:^BOOL(NSURLRequest *request) {
    return ([request.URL.path isEqualToString:httpPath] && [request.HTTPMethod isEqualToString:httpMethod]);
  } withStubResponse:^OHHTTPStubsResponse *(NSURLRequest *request) {
    return [OHHTTPStubsResponse responseWithData:body statusCode:statusCode headers:headers];
  }];
}