app-common/src/main/java/im/angry/openeuicc/service/EuiccChannelManagerService.kt

@@ -370,10 +370,7 @@ class EuiccChannelManagerService : LifecycleService(), OpenEuiccContextMarker {
     fun launchProfileDownloadTask(
         slotId: Int,
         portId: Int,
-        smdp: String,
+        activationCode: ActivationCode
-        matchingId: String?,
-        confirmationCode: String?,
-        imei: String?
     ): ForegroundTaskSubscriberFlow =
         launchForegroundTask(
             getString(R.string.task_profile_download),
@@ -383,10 +380,10 @@ class EuiccChannelManagerService : LifecycleService(), OpenEuiccContextMarker {
             euiccChannelManager.beginTrackedOperation(slotId, portId) {
                 euiccChannelManager.withEuiccChannel(slotId, portId) { channel ->
                     channel.lpa.downloadProfile(
-                        smdp,
+                        activationCode.address,
-                        matchingId,
+                        activationCode.matchingId,
-                        imei,
+                        activationCode.imei,
-                        confirmationCode,
+                        activationCode.confirmationCode,
                         object : ProfileDownloadCallback {
                             override fun onStateUpdate(state: ProfileDownloadCallback.DownloadState) {
                                 if (state.progress == 0) return

app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardActivity.kt

@@ -1,11 +1,11 @@
 package im.angry.openeuicc.ui.wizard
 
+import android.os.Build
 import android.os.Bundle
 import android.view.View
 import android.view.inputmethod.InputMethodManager
 import android.widget.Button
 import android.widget.ProgressBar
-import android.widget.Toast
 import androidx.activity.OnBackPressedCallback
 import androidx.activity.enableEdgeToEdge
 import androidx.core.view.ViewCompat
@@ -19,21 +19,50 @@ import im.angry.openeuicc.ui.BaseEuiccAccessActivity
 import im.angry.openeuicc.util.*
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import net.typeblog.lpac_jni.LocalProfileAssistant
 
 class DownloadWizardActivity: BaseEuiccAccessActivity() {
     data class DownloadWizardState(
-        var currentStepFragmentClassName: String?,
+        var currentStepFragmentClassName: String? = null,
         var selectedLogicalSlot: Int,
-        var smdp: String,
+        var activationCode: ActivationCode = ActivationCode(),
-        var matchingId: String?,
+        var downloadStarted: Boolean = false,
-        var confirmationCode: String?,
+        var downloadTaskID: Long = -1,
-        var imei: String?,
+        var downloadError: LocalProfileAssistant.ProfileDownloadException? = null,
-        var downloadStarted: Boolean,
+    ) {
-        var downloadTaskID: Long,
+        companion object {
-        var downloadError: LocalProfileAssistant.ProfileDownloadException?,
+            private const val FRAGMENT = "currentStepFragmentClassName"
-    )
+            private const val SLOT = "selectedLogicalSlot"
+            private const val ACT_CODE = "activationCode"
+            private const val DL_STARTED = "downloadStarted"
+            private const val DL_ID = "downloadTaskID"
+        }
+
+        fun onSaveInstanceState(outState: Bundle) {
+            outState.putString(FRAGMENT, currentStepFragmentClassName)
+            outState.putInt(SLOT, selectedLogicalSlot)
+            outState.putParcelable(ACT_CODE, activationCode)
+            outState.putBoolean(DL_STARTED, downloadStarted)
+            outState.putLong(DL_ID, downloadTaskID)
+        }
+
+        fun onRestoreInstanceState(savedInstanceState: Bundle) {
+            currentStepFragmentClassName = savedInstanceState
+                .getString(FRAGMENT, currentStepFragmentClassName)
+            selectedLogicalSlot = savedInstanceState
+                .getInt(SLOT, selectedLogicalSlot)
+            activationCode = savedInstanceState
+                .getCompatParcelable(ACT_CODE, ActivationCode::class.java) ?: ActivationCode()
+            downloadStarted = savedInstanceState
+                .getBoolean(DL_STARTED, downloadStarted)
+            downloadTaskID = savedInstanceState
+                .getLong(DL_ID, downloadTaskID)
+        }
+
+        private fun <T> Bundle.getCompatParcelable(key: String, clazz: Class<T>): T? =
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU)
+                getParcelable(key, clazz) else getParcelable(key)
+    }
 
     private lateinit var state: DownloadWizardState
 
@@ -61,15 +90,7 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         })
 
         state = DownloadWizardState(
-            null,
+            selectedLogicalSlot = intent.getIntExtra("selectedLogicalSlot", 0),
-            intent.getIntExtra("selectedLogicalSlot", 0),
-            "",
-            null,
-            null,
-            null,
-            false,
-            -1,
-            null
         )
 
         progressBar = requireViewById(R.id.progress)
@@ -113,30 +134,12 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putString("currentStepFragmentClassName", state.currentStepFragmentClassName)
+        state.onSaveInstanceState(outState)
-        outState.putInt("selectedLogicalSlot", state.selectedLogicalSlot)
-        outState.putString("smdp", state.smdp)
-        outState.putString("matchingId", state.matchingId)
-        outState.putString("confirmationCode", state.confirmationCode)
-        outState.putString("imei", state.imei)
-        outState.putBoolean("downloadStarted", state.downloadStarted)
-        outState.putLong("downloadTaskID", state.downloadTaskID)
     }
 
     override fun onRestoreInstanceState(savedInstanceState: Bundle) {
         super.onRestoreInstanceState(savedInstanceState)
-        state.currentStepFragmentClassName = savedInstanceState.getString(
+        state.onRestoreInstanceState(savedInstanceState)
-            "currentStepFragmentClassName",
-            state.currentStepFragmentClassName
-        )
-        state.selectedLogicalSlot =
-            savedInstanceState.getInt("selectedLogicalSlot", state.selectedLogicalSlot)
-        state.smdp = savedInstanceState.getString("smdp", state.smdp)
-        state.matchingId = savedInstanceState.getString("matchingId", state.matchingId)
-        state.imei = savedInstanceState.getString("imei", state.imei)
-        state.downloadStarted =
-            savedInstanceState.getBoolean("downloadStarted", state.downloadStarted)
-        state.downloadTaskID = savedInstanceState.getLong("downloadTaskID", state.downloadTaskID)
     }
 
     private fun onPrevPressed() {
@@ -168,11 +171,9 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
                         if (!channel.valid) throw EuiccChannelManager.EuiccChannelNotFoundException()
                     }
                 } catch (e: EuiccChannelManager.EuiccChannelNotFoundException) {
-                    Toast.makeText(
+                    this@DownloadWizardActivity
-                        this@DownloadWizardActivity,
+                        .makeLongToast(R.string.download_wizard_slot_removed)
-                        R.string.download_wizard_slot_removed,
+                        .show()
-                        Toast.LENGTH_LONG
-                    ).show()
                     finish()
                 }
             }
@@ -238,8 +239,11 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
     }
 
     abstract class DownloadWizardStepFragment : Fragment(), OpenEuiccContextMarker {
+        private val activity: DownloadWizardActivity
+            get() = requireActivity() as DownloadWizardActivity
+
         protected val state: DownloadWizardState
-            get() = (requireActivity() as DownloadWizardActivity).state
+            get() = activity.state
 
         abstract val hasNext: Boolean
         abstract val hasPrev: Boolean
@@ -247,20 +251,19 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         abstract fun createPrevFragment(): DownloadWizardStepFragment?
 
         protected fun gotoNextFragment(next: DownloadWizardStepFragment? = null) {
-            val realNext = next ?: createNextFragment()
+            activity.showFragment(
-            (requireActivity() as DownloadWizardActivity).showFragment(
+                next ?: createNextFragment()!!,
-                realNext!!,
                 R.anim.slide_in_right,
                 R.anim.slide_out_left
             )
         }
 
         protected fun hideProgressBar() {
-            (requireActivity() as DownloadWizardActivity).progressBar.visibility = View.GONE
+            activity.progressBar.visibility = View.GONE
         }
 
         protected fun showProgressBar(progressValue: Int) {
-            (requireActivity() as DownloadWizardActivity).progressBar.apply {
+            activity.progressBar.apply {
                 visibility = View.VISIBLE
                 if (progressValue >= 0) {
                     isIndeterminate = false
@@ -272,7 +275,7 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         }
 
         protected fun refreshButtons() {
-            (requireActivity() as DownloadWizardActivity).refreshButtons()
+            activity.refreshButtons()
         }
 
         open fun beforeNext() {}

app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardDetailsFragment.kt

@@ -1,10 +1,10 @@
 package im.angry.openeuicc.ui.wizard
 
 import android.os.Bundle
-import android.util.Patterns
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.EditText
 import androidx.core.widget.addTextChangedListener
 import com.google.android.material.textfield.TextInputLayout
 import im.angry.openeuicc.common.R
@@ -17,17 +17,19 @@ class DownloadWizardDetailsFragment : DownloadWizardActivity.DownloadWizardStepF
     override val hasPrev: Boolean
         get() = true
 
-    private lateinit var smdp: TextInputLayout
+    private lateinit var address: EditText
-    private lateinit var matchingId: TextInputLayout
+    private lateinit var matchingId: EditText
-    private lateinit var confirmationCode: TextInputLayout
+    private lateinit var confirmationCode: EditText
-    private lateinit var imei: TextInputLayout
+    private lateinit var imei: EditText
 
     private fun saveState() {
-        state.smdp = smdp.editText!!.text.toString().trim()
+        state.activationCode.let {
-        // Treat empty inputs as null -- this is important for the download step
+            it.address = address.text.toString().trim()
-        state.matchingId = matchingId.editText!!.text.toString().trim().ifBlank { null }
+            // Treat empty inputs as null -- this is important for the download step
-        state.confirmationCode = confirmationCode.editText!!.text.toString().trim().ifBlank { null }
+            it.matchingId = matchingId.text.toString().trim()
-        state.imei = imei.editText!!.text.toString().ifBlank { null }
+            it.confirmationCode = confirmationCode.text.toString().trim()
+            it.imei = imei.text.toString().trim()
+        }
     }
 
     override fun beforeNext() = saveState()
@@ -42,24 +44,23 @@ class DownloadWizardDetailsFragment : DownloadWizardActivity.DownloadWizardStepF
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
-    ): View? {
+    ): View = inflater.inflate(R.layout.fragment_download_details, container, false).apply {
-        val view = inflater.inflate(R.layout.fragment_download_details, container, false)
+        address = requireViewById<TextInputLayout>(R.id.profile_download_server).editText!!
-        smdp = view.requireViewById(R.id.profile_download_server)
+        matchingId = requireViewById<TextInputLayout>(R.id.profile_download_code).editText!!
-        matchingId = view.requireViewById(R.id.profile_download_code)
+        confirmationCode = requireViewById<TextInputLayout>(R.id.profile_download_confirmation_code).editText!!
-        confirmationCode = view.requireViewById(R.id.profile_download_confirmation_code)
+        imei = requireViewById<TextInputLayout>(R.id.profile_download_imei).editText!!
-        imei = view.requireViewById(R.id.profile_download_imei)
+
-        smdp.editText!!.addTextChangedListener {
+        address.addTextChangedListener { updateInputCompleteness() }
-            updateInputCompleteness()
-        }
-        return view
     }
 
     override fun onStart() {
         super.onStart()
-        smdp.editText!!.setText(state.smdp)
+        state.activationCode.let {
-        matchingId.editText!!.setText(state.matchingId)
+            address.setText(it.address)
-        confirmationCode.editText!!.setText(state.confirmationCode)
+            matchingId.setText(it.matchingId)
-        imei.editText!!.setText(state.imei)
+            confirmationCode.setText(it.confirmationCode)
+            imei.setText(it.imei)
+        }
         updateInputCompleteness()
     }
 
@@ -69,7 +70,13 @@ class DownloadWizardDetailsFragment : DownloadWizardActivity.DownloadWizardStepF
     }
 
     private fun updateInputCompleteness() {
-        inputComplete = Patterns.DOMAIN_NAME.matcher(smdp.editText!!.text).matches()
+        saveState()
+        inputComplete = try {
+            state.activationCode.validate()
+            true
+        } catch (e: IllegalArgumentException) {
+            false
+        }
         refreshButtons()
     }
 }

app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardMethodSelectFragment.kt

@@ -9,7 +9,6 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.TextView
-import android.widget.Toast
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.DividerItemDecoration
@@ -113,11 +112,9 @@ class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizard
         val text = clipboard.primaryClip?.getItemAt(0)?.text
 
         if (text == null) {
-            Toast.makeText(
+            requireContext()
-                requireContext(),
+                .makeShortToast(R.string.profile_download_no_lpa_string)
-                R.string.profile_download_no_lpa_string,
+                .show()
-                Toast.LENGTH_SHORT
-            ).show()
             return
         }
 
@@ -126,10 +123,9 @@ class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizard
 
     private fun processLpaString(input: String) {
         try {
-            val parsed = ActivationCode.fromString(input)
+            state.activationCode.fromToken(input)
-            state.smdp = parsed.address
+            state.activationCode.validate()
-            state.matchingId = parsed.matchingId
+            if (state.activationCode.confirmationCodeRequired) {
-            if (parsed.confirmationCodeRequired) {
                 AlertDialog.Builder(requireContext()).apply {
                     setTitle(R.string.profile_download_required_confirmation_code)
                     setMessage(R.string.profile_download_required_confirmation_code_message)
@@ -176,6 +172,5 @@ class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizard
         override fun onBindViewHolder(holder: DownloadMethodViewHolder, position: Int) {
             holder.bind(downloadMethods[position])
         }
-
     }
 }

app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardProgressFragment.kt

@@ -79,19 +79,11 @@ class DownloadWizardProgressFragment : DownloadWizardActivity.DownloadWizardStep
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
-    ): View? {
+    ): View = inflater.inflate(R.layout.fragment_download_progress, container, false).apply {
-        val view = inflater.inflate(R.layout.fragment_download_progress, container, false)
+        val view = requireViewById<RecyclerView>(R.id.download_progress_list)
-        val recyclerView = view.requireViewById<RecyclerView>(R.id.download_progress_list)
+        view.adapter = adapter
-        recyclerView.adapter = adapter
+        view.layoutManager = LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false)
-        recyclerView.layoutManager =
+        view.addItemDecoration(DividerItemDecoration(context, LinearLayoutManager.VERTICAL))
-            LinearLayoutManager(view.context, LinearLayoutManager.VERTICAL, false)
-        recyclerView.addItemDecoration(
-            DividerItemDecoration(
-                requireContext(),
-                LinearLayoutManager.VERTICAL
-            )
-        )
-        return view
     }
 
     override fun onStart() {
@@ -119,8 +111,9 @@ class DownloadWizardProgressFragment : DownloadWizardActivity.DownloadWizardStep
                         // Change the state of the last InProgress item to success (or error)
                         progressItems.forEachIndexed { index, progressItem ->
                             if (progressItem.state == ProgressState.InProgress) {
-                                progressItem.state =
+                                progressItem.state = if (state.downloadError == null)
-                                    if (state.downloadError == null) ProgressState.Done else ProgressState.Error
+                                    ProgressState.Done else
+                                    ProgressState.Error
                             }
 
                             adapter.notifyItemChanged(index)
@@ -147,25 +140,15 @@ class DownloadWizardProgressFragment : DownloadWizardActivity.DownloadWizardStep
         } else {
             euiccChannelManagerService.waitForForegroundTask()
 
-            val (slotId, portId) = euiccChannelManager.withEuiccChannel(state.selectedLogicalSlot) { channel ->
+            val (slotId, portId) = euiccChannelManager.withEuiccChannel(state.selectedLogicalSlot)
-                Pair(channel.slotId, channel.portId)
+            { channel -> Pair(channel.slotId, channel.portId) }
-            }
 
             // Set started to true even before we start -- in case we get killed in the middle
             state.downloadStarted = true
 
-            val ret = euiccChannelManagerService.launchProfileDownloadTask(
+            euiccChannelManagerService
-                slotId,
+                .launchProfileDownloadTask(slotId, portId, state.activationCode)
-                portId,
+                .also { state.downloadTaskID = it.taskId }
-                state.smdp,
-                state.matchingId,
-                state.confirmationCode,
-                state.imei
-            )
-
-            state.downloadTaskID = ret.taskId
-
-            ret
         }
 
     private fun updateProgress(progress: Int) {
@@ -189,10 +172,9 @@ class DownloadWizardProgressFragment : DownloadWizardActivity.DownloadWizardStep
         }
     }
 
-    private inner class ProgressItemHolder(val root: View) : RecyclerView.ViewHolder(root) {
+    private inner class ProgressItemHolder(root: View) : RecyclerView.ViewHolder(root) {
         private val title = root.requireViewById<TextView>(R.id.download_progress_item_title)
-        private val progressBar =
+        private val progressBar = root.requireViewById<ProgressBar>(R.id.download_progress_icon_progress)
-            root.requireViewById<ProgressBar>(R.id.download_progress_icon_progress)
         private val icon = root.requireViewById<ImageView>(R.id.download_progress_icon)
 
         fun bind(item: ProgressItem) {

app-common/src/main/java/im/angry/openeuicc/ui/wizard/DownloadWizardSlotSelectFragment.kt

@@ -19,7 +19,6 @@ import im.angry.openeuicc.util.*
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.toList
 import kotlinx.coroutines.launch
-import net.typeblog.lpac_jni.LocalProfileInfo
 
 class DownloadWizardSlotSelectFragment : DownloadWizardActivity.DownloadWizardStepFragment() {
     companion object {
@@ -130,7 +129,7 @@ class DownloadWizardSlotSelectFragment : DownloadWizardActivity.DownloadWizardSt
         }
 
         if (slots.isNotEmpty()) {
-            state.imei = slots[adapter.currentSelectedIdx].imei
+            state.activationCode.imei = slots[adapter.currentSelectedIdx].imei
         }
 
         adapter.notifyDataSetChanged()
@@ -165,7 +164,7 @@ class DownloadWizardSlotSelectFragment : DownloadWizardActivity.DownloadWizardSt
             adapter.notifyItemChanged(curIdx)
             // Selected index isn't logical slot ID directly, needs a conversion
             state.selectedLogicalSlot = adapter.slots[adapter.currentSelectedIdx].logicalSlotId
-            state.imei = adapter.slots[adapter.currentSelectedIdx].imei
+            state.activationCode.imei = adapter.slots[adapter.currentSelectedIdx].imei
         }
 
         fun bind(item: SlotInfo, idx: Int) {

app-common/src/main/java/im/angry/openeuicc/util/ActivationCode.kt

@@ -1,23 +1,141 @@
 package im.angry.openeuicc.util
 
-data class ActivationCode(
+import android.os.Parcel
-    val address: String,
+import android.os.Parcelable
-    val matchingId: String? = null,
+import java.util.Objects
-    val oid: String? = null,
+
-    val confirmationCodeRequired: Boolean = false,
+class ActivationCode : Parcelable, Cloneable {
-) {
+    var address: String
-    companion object {
+    var matchingId: String
-        fun fromString(input: String): ActivationCode {
+    var oid: String
-            val components = input.removePrefix("LPA:").split('$')
+    var confirmationCodeRequired: Boolean
-            if (components.size < 2 || components[0] != "1") {
+        get() = field || confirmationCode.isNotBlank()
-                throw IllegalArgumentException("Invalid activation code format")
+    var confirmationCode: String
-            }
+    var imei: String
-            return ActivationCode(
+
-                address = components[1].trim(),
+    constructor() {
-                matchingId = components.getOrNull(2)?.trim()?.ifBlank { null },
+        address = ""
-                oid = components.getOrNull(3)?.trim()?.ifBlank { null },
+        matchingId = ""
-                confirmationCodeRequired = components.getOrNull(4)?.trim() == "1"
+        oid = ""
-            )
+        confirmationCodeRequired = false
+        confirmationCode = ""
+        imei = ""
+    }
+
+    private constructor(parcel: Parcel) {
+        address = parcel.readString() ?: ""
+        matchingId = parcel.readString() ?: ""
+        oid = parcel.readString() ?: ""
+        confirmationCodeRequired = parcel.readByte() != 0.toByte()
+        confirmationCode = parcel.readString() ?: ""
+        imei = parcel.readString() ?: ""
+    }
+
+    fun validate() {
+        require(isValidDomain(address)) { "SM-DP+ address is invalid" }
+        require(isValidMatchingId(matchingId)) { "Matching ID is invalid" }
+        require(isValidOID(oid)) { "OID is invalid" }
+        require(confirmationCodeRequired && confirmationCode.isNotBlank()) { "Confirmation code is required" }
+        require(isValidIMEI(imei)) { "IMEI is invalid" }
+    }
+
+    fun fromToken(token: String) {
+        val components = token.removePrefix("LPA:").split('$')
+            .map { it.trim().ifEmpty { null } }
+        if (components.size < 2 || components[0] != "1" || components[1] == null) {
+            throw IllegalArgumentException("Invalid activation code format")
         }
+        address = components[1]!!
+        matchingId = components.getOrNull(2) ?: ""
+        oid = components.getOrNull(3) ?: ""
+        confirmationCodeRequired = components.getOrNull(4) == "1"
+    }
+
+    override fun toString(): String {
+        val parts = listOf(
+            "1",
+            address,
+            matchingId,
+            oid,
+            if (confirmationCodeRequired) "1" else ""
+        )
+        return parts.joinToString("$").trimEnd('$')
+    }
+
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) {
+        parcel.writeString(address)
+        parcel.writeString(matchingId)
+        parcel.writeString(oid)
+        parcel.writeByte(if (confirmationCodeRequired) 1 else 0)
+        parcel.writeString(confirmationCode)
+        parcel.writeString(imei)
+    }
+
+    override fun describeContents(): Int = 0
+
+    override fun hashCode(): Int = Objects.hash(
+        address,
+        matchingId,
+        oid,
+        confirmationCodeRequired,
+        confirmationCode,
+        imei
+    )
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other !is ActivationCode) return false
+        if (other.address != address) return false
+        if (other.matchingId != matchingId) return false
+        if (other.oid != oid) return false
+        if (other.confirmationCodeRequired != confirmationCodeRequired) return false
+        if (other.confirmationCode != confirmationCode) return false
+        if (other.imei != imei) return false
+        return true
+    }
+
+    public override fun clone() = ActivationCode().also {
+        it.address = address
+        it.matchingId = matchingId
+        it.oid = oid
+        it.confirmationCodeRequired = confirmationCodeRequired
+        it.confirmationCode = confirmationCode
+        it.imei = imei
+    }
+
+    companion object CREATOR : Parcelable.Creator<ActivationCode> {
+        override fun createFromParcel(parcel: Parcel) = ActivationCode(parcel)
+        override fun newArray(size: Int): Array<ActivationCode?> = arrayOfNulls(size)
     }
 }
+
+private fun isValidSegment(segment: String): Boolean {
+    return segment.all { it.isLetterOrDigit() || it == '-' }
+}
+
+private fun isValidDomain(fqdn: String): Boolean {
+    val name = fqdn.trimEnd('.')
+    if (name.length !in 1..<255) return false
+    if (!name.contains('.')) return false
+    return name.split('.').all { it.length < 64 && isValidSegment(it) }
+}
+
+private fun isValidMatchingId(matchingId: String): Boolean {
+    // TODO: matching id string max length in specs not defined
+    if (matchingId.isBlank()) return true
+    return isValidSegment(matchingId)
+}
+
+private fun isValidOID(oid: String): Boolean {
+    if (oid.isBlank()) return true
+    if (!oid.contains('.')) return false
+    return oid.split('.').all { it.all(Char::isDigit) }
+}
+
+private fun isValidIMEI(imei: String): Boolean {
+    // TODO: Strong IMEI validation
+    if (imei.isBlank()) return true
+    if (imei.length !in 14..16) return false
+    return imei.all(Char::isDigit)
+}

app-common/src/main/java/im/angry/openeuicc/util/Toast.kt

@@ -0,0 +1,18 @@
+package im.angry.openeuicc.util
+
+import android.app.Activity
+import android.content.Context
+import android.widget.Toast
+import androidx.annotation.StringRes
+
+fun Activity.makeLongToast(@StringRes resId: Int): Toast =
+    Toast.makeText(this, resId, Toast.LENGTH_LONG)
+
+fun Activity.makeShortToast(@StringRes resId: Int): Toast =
+    Toast.makeText(this, resId, Toast.LENGTH_SHORT)
+
+fun Context.makeLongToast(@StringRes resId: Int): Toast =
+    Toast.makeText(this, resId, Toast.LENGTH_LONG)
+
+fun Context.makeShortToast(@StringRes resId: Int): Toast =
+    Toast.makeText(this, resId, Toast.LENGTH_SHORT)

app-common/src/test/java/im/angry/openeuicc/util/ActivationCodeTest.kt

@@ -0,0 +1,65 @@
+package im.angry.openeuicc.util
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertThrows
+import org.junit.Test
+
+class ActivationCodeTest {
+    /**
+     * @see {https://www.gsma.com/esim/wp-content/uploads/2020/06/SGP.22-v2.2.2.pdf#page=112}
+     */
+    @Suppress("SpellCheckingInspection")
+    private val expectedFixtures = buildMap {
+        val ac = ActivationCode()
+        ac.address = "SMDP.GSMA.COM"
+        ac.matchingId = "04386-AGYFT-A74Y8-3F815"
+        // if SM-DP+ OID and Confirmation Code Required Flag are not present
+        put("1\$SMDP.GSMA.COM\$04386-AGYFT-A74Y8-3F815", ac.clone())
+        // if SM-DP+ OID is not present and Confirmation Code Required Flag is present
+        ac.confirmationCodeRequired = true
+        put("1\$SMDP.GSMA.COM\$04386-AGYFT-A74Y8-3F815\$\$1", ac.clone())
+        // if SM-DP+ OID and Confirmation Code Required flag are present
+        ac.oid = "1.3.6.1.4.1.31746"
+        put("1\$SMDP.GSMA.COM\$04386-AGYFT-A74Y8-3F815\$1.3.6.1.4.1.31746\$1", ac.clone())
+        // if SM-DP+ OID is present and Confirmation Code Required Flag is not present
+        ac.confirmationCodeRequired = false
+        put("1\$SMDP.GSMA.COM\$04386-AGYFT-A74Y8-3F815\$1.3.6.1.4.1.31746", ac.clone())
+        // if SM-DP+ OID is present, Activation token is left blank and Confirmation Code Required Flag is not present
+        ac.matchingId = ""
+        put("1\$SMDP.GSMA.COM\$\$1.3.6.1.4.1.31746", ac.clone())
+    }
+
+    @Suppress("SpellCheckingInspection")
+    private val unexpectedFixtures = listOf(
+        "", "LPA:",
+        "1", "LPA:1",
+        "1$", "LPA:1$",
+        "1$$", "LPA:1$$",
+        "2\$SMDP.GSMA.COM", "LPA:2\$SMDP.GSMA.COM",
+    )
+
+    @Test
+    fun testParsing() {
+        val actual = ActivationCode()
+        for ((input, expected) in expectedFixtures) {
+            actual.fromToken(input)
+            assertEquals(expected.address, actual.address)
+            assertEquals(expected.matchingId, actual.matchingId)
+            assertEquals(expected.oid, actual.oid)
+            assertEquals(expected.confirmationCodeRequired, actual.confirmationCodeRequired)
+            assertEquals(expected, actual)
+            assertEquals(expected.toString(), input)
+            assertEquals(expected.hashCode(), actual.hashCode())
+        }
+    }
+
+    @Test
+    fun testUnexpected() {
+        for (fixture in unexpectedFixtures) {
+            assertThrows(IllegalArgumentException::class.java) {
+                val activationCode = ActivationCode()
+                activationCode.fromToken(fixture)
+            }
+        }
+    }
+}