public key pinning

gistfile1.m

- (void)connection:(NSURLConnection *)connection
willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
        SecTrustRef serverTrust = challenge.protectionSpace.serverTrust;
        
        BOOL shouldPerformConnectionSecurityMeasures = [[MINetworkSecurityManager sharedManager] shouldPerformConnectionSecurityMeasuresForURLConnection:connection];
        
        BOOL trusted = shouldPerformConnectionSecurityMeasures ? [[MINetworkSecurityManager sharedManager] evaluateServerTrust:serverTrust] : [[MINetworkSecurityManager sharedManager] evaluateTrust:serverTrust forSecurityModel:MINetworkSecurityModelStandard error:nil];
        
        if (trusted) {
            NSURLCredential *credential = [NSURLCredential credentialForTrust:serverTrust];
            [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
        } else {
            self.networkSecurityErrorDetected = YES;
            [[challenge sender] cancelAuthenticationChallenge:challenge];
        }
    }
}