𝚏𝚕𝚞𝚏𝚏𝚢-𝚘𝚔𝚑𝚝𝚝𝚙-𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛𝚜 📡

📡 𝙷𝚘𝚠 𝚝𝚘 𝚞𝚜𝚎 𝙾𝚔𝚑𝚝𝚝𝚙 𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛𝚜 𝚏𝚘𝚛 𝚗𝚎𝚝𝚠𝚘𝚛𝚔 𝚛𝚎𝚚𝚞𝚎𝚜𝚝𝚜, 𝚕𝚘𝚐 𝚝𝚑𝚎𝚖, 𝚊𝚗𝚍 𝚖𝚘𝚍𝚒𝚏𝚢 𝚝𝚑𝚎𝚖 𝚊𝚜 𝚛𝚎𝚚𝚞𝚒𝚛𝚎𝚍 𝚒𝚗 𝙰𝚗𝚍𝚛𝚘𝚒𝚍

---

Topics
𝚆𝚑𝚊𝚝 𝚒𝚜 𝙾𝚔𝙷𝚝𝚝𝚙 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛
𝙲𝚑𝚊𝚒𝚗𝚒𝚗𝚐 𝙾𝚔𝙷𝚝𝚝𝚙 𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛
𝚆𝚑𝚊𝚝 𝚊𝚛𝚎 𝚝𝚑𝚎 𝚍𝚒𝚏𝚏𝚎𝚛𝚎𝚗𝚝 𝚝𝚢𝚙𝚎𝚜 𝚘𝚏 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛𝚜
𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙰𝚗𝚊𝚕𝚢𝚝𝚒𝚌𝚜 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛
𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙰𝙿𝙸 𝚔𝚎𝚢 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛
𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙷𝚃𝚃𝙿 𝙻𝚘𝚐𝚐𝚒𝚗𝚐 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

Representation	𝙾𝚞𝚝𝚙𝚞𝚝

𝚆𝚑𝚊𝚝 𝚒𝚜 𝙾𝚔𝙷𝚝𝚝𝚙 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• OkHttp is a mechanism that helps you monitor and re-write network calls.
• In the image below we can see that a call is sent from the application -> Then it is received by the interceptor and modified -> Then further modified call is received at the server.

𝙲𝚑𝚊𝚒𝚗𝚒𝚗𝚐 𝙾𝚔𝙷𝚝𝚝𝚙 𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• We can chain multiple interceptors and modify the request
• Order of the chaining is important
• Okhttp keeps a list of interceptors and processes them in the same order in which they are added

𝚆𝚑𝚊𝚝 𝚊𝚛𝚎 𝚝𝚑𝚎 𝚍𝚒𝚏𝚏𝚎𝚛𝚎𝚗𝚝 𝚝𝚢𝚙𝚎𝚜 𝚘𝚏 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛𝚜

There are two types of interceptors

• Application Interceptors
• Network Interceptors

Application Interceptors	Network Interceptors
The application interceptors are the type of interceptors that are found between the application and the okhttp module.	The network interceptors are the type of interceptors that are found between the okhttp module and remote server.
They are not concerned with the intermediate responses and focus on the final response sent to the application.	They are concerned with the intermediary responses from the time of application making the call and receiving the final response.

𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙰𝚗𝚊𝚕𝚢𝚝𝚒𝚌𝚜 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• Even here we customize the regular interceptor to send certain specific user data to the server on each API request

𝚄𝚜𝚎 𝚌𝚊𝚜𝚎

• Suppose again if we are sending information like Device-ID, OS-version etc to the server to understand the customer who is using the API service.
• Now again instead of sending these details which can be of any length, we can send it from one place having a common interceptor

𝙴𝚡𝚊𝚖𝚙𝚕𝚎

class AnalyticsInterceptor(private val context: Context): Interceptor {

    private val APP_VERSION = "X-App-Version"
    private val DEVICE_MODEL = "X-Device-Model"
    private val DEVICE_PLATFORM = "X-Device-Platform"
    private val OS_VERSION = "X-Device-OS-Version"

    override fun intercept(chain: Interceptor.Chain): Response {
        val request: Request = chain.request()

        val requestBuilder: Request.Builder = request.newBuilder()

        val packageInfo = context.packageManager.getPackageInfo(context.packageName, 0)
        val version = packageInfo.versionName

        requestBuilder.addHeader(APP_VERSION, version)
        requestBuilder.addHeader(OS_VERSION, Build.VERSION.SDK_INT.toString())
        requestBuilder.addHeader(DEVICE_MODEL, Build.MODEL)
        requestBuilder.addHeader(DEVICE_PLATFORM, "android")

        return chain.proceed(requestBuilder.build())
    }
}

𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙰𝙿𝙸 𝚔𝚎𝚢 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• There is no such special thing as ApiKey or tolken Interceptor.
• We customize the interceptor in such a way

𝚄𝚜𝚎 𝚌𝚊𝚜𝚎

• Suppose in every API request we want to pass an auth token to the server in the header.
• We need not have to pass while creating every API request.
• Instead of it we can pass it in a custom interceptor

𝙴𝚡𝚊𝚖𝚙𝚕𝚎

class ApiKeyInterceptor: Interceptor {

    private val apiKeyQueryParameterKey = "api_key"

    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val originalUrl = originalRequest.url

        val url = originalUrl.newBuilder()
            .addQueryParameter(apiKeyQueryParameterKey, BuildConfig.THE_MOVIE_DB_API_TOKEN)
            .build()

        val newRequest = originalRequest.newBuilder()
            .url(url)
            .build()

        return chain.proceed(newRequest)
    }
}

• Add the object while creating the okhttp request

val okHttpClient = OkHttpClient.Builder()
.readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.addInterceptor(ApiKeyInterceptor()) 

𝚆𝚑𝚊𝚝 𝚒𝚜 𝚊𝚗 𝙷𝚃𝚃𝙿 𝙻𝚘𝚐𝚐𝚒𝚗𝚐 𝙸𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• The HTTP Logging Interceptor is an interceptor that helps to log all the HTTP requests that are being sent to the server.
• It also can log all the responses that are sent from the server to the application.

𝙷𝚘𝚠 𝚞𝚜𝚎𝚏𝚞𝚕 𝚒𝚜 𝙷𝚃𝚃𝙿 𝚕𝚘𝚐𝚐𝚒𝚗𝚐 𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛

• It is helpful in debugging the application on network-related issues when building the application.

𝚆𝚑𝚊𝚝 𝚒𝚜 𝚁𝚎𝚍𝚊𝚌𝚝𝙷𝚎𝚊𝚍𝚎𝚛 𝚒𝚗 𝙷𝚃𝚃𝙿 𝚕𝚘𝚐𝚐𝚒𝚗𝚐 𝚒𝚗𝚝𝚎𝚛𝚌𝚎𝚙𝚝𝚘𝚛.

• This is the ability to remove certain information from logging in to the terminal.
• For example, we can remove the API key getting logged if it is sent in a request to the server.

𝙴𝚡𝚊𝚖𝚙𝚕𝚎

• Add the code

 val loggingInterceptor = HttpLoggingInterceptor { message -> Timber.tag("OkHttp").d(message) }
      loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
      loggingInterceptor.redactHeader("x-amz-cf-id")

• And add it while building the okhttp client

object OkHttpProvider {

  // Timeout for the network requests
  private const val REQUEST_TIMEOUT = 3L

  private var okHttpClient: OkHttpClient? = null

  fun getOkHttpClient(context: Context): OkHttpClient {
    return if (okHttpClient == null) {
      val loggingInterceptor = HttpLoggingInterceptor { message -> Timber.tag("OkHttp").d(message) }
      loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
      loggingInterceptor.redactHeader("x-amz-cf-id")

      val okHttpClient = OkHttpClient.Builder()
          .readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
          .connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
          .addInterceptor(loggingInterceptor)
          .build()
      OkHttpProvider.okHttpClient = okHttpClient
      okHttpClient
    } else {
      okHttpClient!!
    }
  }
}

𝚂𝚞𝚙𝚙𝚘𝚛𝚝 ☕

𝙸𝚏 𝚢𝚘𝚞 𝚏𝚎𝚎𝚕 𝚕𝚒𝚔𝚎 𝚜𝚞𝚙𝚙𝚘𝚛𝚝 𝚖𝚎 𝚊 𝚌𝚘𝚏𝚏𝚎𝚎 𝚏𝚘𝚛 𝚖𝚢 𝚎𝚏𝚏𝚘𝚛𝚝𝚜, 𝙸 𝚠𝚘𝚞𝚕𝚍 𝚐𝚛𝚎𝚊𝚝𝚕𝚢 𝚊𝚙𝚙𝚛𝚎𝚌𝚒𝚊𝚝𝚎 𝚒𝚝.

𝙲𝚘𝚗𝚝𝚛𝚒𝚋𝚞𝚝𝚎 🙋‍♂️

𝚁𝚎𝚊𝚍 𝚌𝚘𝚗𝚝𝚛𝚒𝚋𝚞𝚝𝚒𝚘𝚗 𝚐𝚞𝚒𝚍𝚎𝚕𝚒𝚗𝚎𝚜 𝚏𝚘𝚛 𝚖𝚘𝚛𝚎 𝚒𝚗𝚏𝚘𝚛𝚖𝚊𝚝𝚒𝚘𝚗 𝚛𝚎𝚐𝚊𝚛𝚍𝚒𝚗𝚐 𝚌𝚘𝚗𝚝𝚛𝚒𝚋𝚞𝚝𝚒𝚘𝚗.

𝙵𝚎𝚎𝚍𝚋𝚊𝚌𝚔 ✍️

𝙵𝚎𝚊𝚝𝚞𝚛𝚎 𝚛𝚎𝚚𝚞𝚎𝚜𝚝𝚜 𝚊𝚛𝚎 𝚊𝚕𝚠𝚊𝚢𝚜 𝚠𝚎𝚕𝚌𝚘𝚖𝚎, 𝙵𝚒𝚕𝚎 𝚊𝚗 𝚒𝚜𝚜𝚞𝚎 𝚑𝚎𝚛𝚎.

𝙵𝚒𝚗𝚍 𝚝𝚑𝚒𝚜 𝚙𝚛𝚘𝚓𝚎𝚌𝚝 𝚞𝚜𝚎𝚏𝚞𝚕 ? ❤️

𝚂𝚞𝚙𝚙𝚘𝚛𝚝 𝚒𝚝 𝚋𝚢 𝚌𝚕𝚒𝚌𝚔𝚒𝚗𝚐 𝚝𝚑𝚎 ⭐ 𝚋𝚞𝚝𝚝𝚘𝚗 𝚘𝚗 𝚝𝚑𝚎 𝚞𝚙𝚙𝚎𝚛 𝚛𝚒𝚐𝚑𝚝 𝚘𝚏 𝚝𝚑𝚒𝚜 𝚙𝚊𝚐𝚎. ✌️

𝙻𝚒𝚌𝚎𝚗𝚜𝚎 💳

𝚃𝚑𝚒𝚜 𝚙𝚛𝚘𝚓𝚎𝚌𝚝 𝚒𝚜 𝚕𝚒𝚌𝚎𝚗𝚜𝚎𝚍 𝚞𝚗𝚍𝚎𝚛 𝚝𝚑𝚎 𝙰𝚙𝚊𝚌𝚑𝚎 𝙻𝚒𝚌𝚎𝚗𝚜𝚎 𝟸.𝟶 - 𝚜𝚎𝚎 𝚝𝚑𝚎 𝙻𝙸𝙲𝙴𝙽𝚂𝙴 𝚏𝚒𝚕𝚎 𝚏𝚘𝚛 𝚍𝚎𝚝𝚊𝚒𝚕𝚜.