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kotlinlang

Hi guys! I’m working on setting up a certificate pinning in my client app and struggle with catching a pinning error. I want to show a full-screen blocking banner if pinning error occurs.  Error handling is not a part of `CertificatePinner` api, but also pinning error doesn’t trigger `HttpResponseValidator` . How can I configure `HttpClient` to catch this error?

Do you mean the `CertificatePinner` for the Darwin engine? If so, have you tried catching the `TlsPeerUnverifiedException` introduced in Ktor 3.1.0?

Yes, I have Darwin and OkHttp implementations, but I’m struggling with finding a place where to catch the error, how to configure catching.

That’s what I have for Darwin, for example:
```    if (engineConfig is DarwinClientEngineConfig) {
        val builder = CertificatePinner.Builder()
        listOf("host" to "pinSHA").forEach { (host, pinSHA) -&gt;
            builder.add(host, pinSHA)
        }
        engineConfig.handleChallenge(builder.build())
    }```

for OkHttp is pretty similar:
``` if (engineConfig is OkHttpConfig) {
        engineConfig.config {
            certificatePinner(
                CertificatePinner.Builder().apply {
                    listOf("host" to "pinSHA").forEach { (host, pinSHA) -&gt;
                        add(host, pinSHA)
                    }

                }.build()
            )
        }
    }```

Have you tried catching the exception in the place where you initiate the request?

I wanted it to be generic, so if any request fails with this error, I want to handle it in generic way (show blocking screen). Similar to how we can manage http errors with `HttpResponseValidator` <https://ktor.io/docs/client-response-validation.html#non-2xx>

I’m probably looking for something not existing yet :disappointed:

Unfortunately, you have to catch the exceptions explicitly for each platform.