A Retrofit Interceptor for logging network requests as cURL commands in Android

CurlLoggingInterceptor.kt

import okhttp3.Interceptor
import okhttp3.Request
import okhttp3.Response
import java.io.IOException

/**
 * A Retrofit Interceptor for logging network requests as cURL commands in Android.
 */
class CurlLoggingInterceptor : Interceptor {

    @Throws(IOException::class)
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request()
        val curlCommand = buildCurlCommand(request)
        // Log the cURL command to the console
        println("CURL: $curlCommand")
        return chain.proceed(request)
    }

    private fun buildCurlCommand(request: Request): String {
        val curlCommand = StringBuilder("curl -X ${request.method}")
        
        // Add headers
        for ((name, value) in request.headers) {
            curlCommand.append(" -H \"$name: $value\"")
        }
        
        // Add body if present
        request.body?.let { body ->
            val buffer = okio.Buffer()
            body.writeTo(buffer)
            val bodyString = buffer.readUtf8()
            curlCommand.append(" -d '${bodyString.replace("'", "\\'")}'")
        }
        
        // Add URL
        curlCommand.append(" \"${request.url}\"")

        return curlCommand.toString()
    }
}