[WIP] add USPS support

app/src/main/java/dev/itsvic/parceltracker/api/USPSDeliveryService.kt

@@ -0,0 +1,105 @@
+package dev.itsvic.parceltracker.api
+
+import dev.itsvic.parceltracker.R
+import okhttp3.MediaType
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.Request
+import okhttp3.RequestBody
+import okhttp3.RequestBody.Companion.toRequestBody
+import okhttp3.coroutines.executeAsync
+import android.util.Log
+import com.squareup.moshi.Json
+import com.squareup.moshi.JsonClass
+import kotlinx.coroutines.ExperimentalForInheritanceCoroutinesApi
+import org.json.JSONObject
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import retrofit2.Retrofit
+import retrofit2.http.Body
+import retrofit2.http.Path
+import retrofit2.http.GET
+import retrofit2.http.Header
+import retrofit2.http.POST
+import java.time.LocalDateTime
+
+object USPSDeliveryService : DeliveryService {
+    override val nameResource: Int = R.string.service_usps
+    override val acceptsPostCode: Boolean = false
+    override val requiresPostCode: Boolean = false
+
+    override suspend fun getParcel(trackingId: String, postCode: String?): Parcel {
+        // dummy stuff just so this compiles
+        return Parcel(
+            trackingId,
+            listOf(ParcelHistoryItem("", LocalDateTime.now(), "")),
+            Status.DeliveryFailure
+        )
+    }
+
+    private val retrofit = Retrofit.Builder().baseUrl("https://api.usps.com/").client(api_client)
+        .addConverterFactory(api_factory).build()
+
+    private val service = retrofit.create(API::class.java)
+
+    private interface API {
+        @POST("oauth2/v3/token")
+        suspend fun getOauthToken(
+            @Body data: GetOauthToken
+        ): OauthTokenResponse
+
+        @GET("tracking/v3/tracking")
+        suspend fun getStatus(
+            @Path("trackingId") trackingId: String,
+            @Header("Authorization") authorization: String
+        ): StatusResponse
+    }
+
+    @JsonClass(generateAdapter = true)
+    internal data class GetOauthToken(
+        // from https://developers.usps.com/Oauth
+        val clientId: String,
+        val clientSecret: String,
+        val grantType: String = "authorization_code",
+        val scopes: List<String> = listOf("tracking"),
+        val tokenUrl: String = "https://apis.usps.com/oauth2/v3/token",
+    )
+
+    @JsonClass(generateAdapter = true)
+    internal data class OauthTokenResponse(
+        val oauthToken: String
+    )
+
+    @JsonClass(generateAdapter = true)
+    internal data class StatusResponse(
+        val expectedDeliveryDate: String,
+        val expectedDeliveryTime: String,
+        val guaranteedDeliveryDate: String,
+        val eventSummaries: List<EventSummary>
+    )
+
+    @JsonClass(generateAdapter = true)
+    internal data class EventSummary(
+        val eventDescription: String
+    )
+
+/*
+    @OptIn(ExperimentalCoroutinesApi::class)
+    private suspend fun getOauthToken(clientId: String, clientSecret: String): String {
+
+        // this should work trust me
+        val tokenResp = service.getOauthToken()
+
+        val request = Request.Builder().post(body).url(TOKEN_URL).build()
+
+        api_client.newCall(request).executeAsync().use { response ->
+            Log.d("USPS", "Got Response")
+            var jsonWebToken = ""
+            if (response.code == 200) {
+                jsonWebToken = JSONObject(response.body.string()).optString("access_token", "")
+                Log.d("USPS", "Got Oauth2 token! $jsonWebToken")
+                // TODO: verify access token with provided public key
+                // if the USPS gets hacked we may have bigger problems on our hands than inaccurate package tracking
+            } else Log.d("USPS", "Couldn't get Oauth2 token ): response code was ${response.code}")
+            return jsonWebToken
+        }
+    }*/
+}

app/src/main/res/values/strings.xml

@@ -84,4 +84,5 @@
     <string name="settings_api_keys">API keys</string>
     <string name="service_ukrposhta">Ukrposhta</string>
     <string name="service_gls_hungary">GLS Hungary</string>
+    <string name="service_usps">USPS</string>
 </resources>

gradle/libs.versions.toml

@@ -17,6 +17,7 @@ kotlinxSerializationJson = "1.7.3"
 room = "2.6.1"
 datastorePreferences = "1.1.4"
 retrofit = "2.11.0"
+skrapeit = "1.2.2"
 work = "2.10.0"
 kotlinxCoroutinesGuava = "1.10.1"
 material3 = "1.4.0-alpha11"
@@ -53,6 +54,7 @@ room-ktx = { group = "androidx.room", name = "room-ktx", version.ref = "room" }
 androidx-datastore-preferences = { group = "androidx.datastore", name = "datastore-preferences", version.ref = "datastorePreferences" }
 retrofit = { group = "com.squareup.retrofit2", name = "retrofit", version.ref = "retrofit" }
 converter-moshi = { group = "com.squareup.retrofit2", name = "converter-moshi", version.ref = "retrofit" }
+skrapeit = { module = "it.skrape:skrapeit", version.ref = "skrapeit" }
 work-runtime = { group = "androidx.work", name = "work-runtime", version.ref = "work" }
 work-runtime-ktx = { group = "androidx.work", name = "work-runtime-ktx", version.ref = "work" }
 kotlinx-coroutines-guava = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-guava", version.ref = "kotlinxCoroutinesGuava" }