app-common/src/main/AndroidManifest.xml

@@ -30,7 +30,24 @@
         <activity
             android:exported="true"
             android:name="im.angry.openeuicc.ui.wizard.DownloadWizardActivity"
-            android:label="@string/download_wizard" />
+            android:label="@string/download_wizard">
+            <intent-filter tools:ignore="AppLinkUrlError">
+                <action android:name="android.intent.action.VIEW" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+
+                <!-- Accepts URIs that begin with "lpa:" -->
+                <!-- for example: "LPA:1$..." -->
+                <!-- refs: https://www.iana.org/assignments/uri-schemes/prov/lpa -->
+                <data
+                    android:scheme="lpa"
+                    android:sspPrefix="1$" />
+                <data
+                    android:scheme="LPA"
+                    android:sspPrefix="1$" />
+            </intent-filter>
+        </activity>
 
         <activity-alias
             android:exported="true"

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

@@ -21,7 +21,6 @@ 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() {
@@ -63,15 +62,15 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         })
 
         state = DownloadWizardState(
-            null,
+            currentStepFragmentClassName = null,
-            intent.getIntExtra("selectedLogicalSlot", 0),
+            selectedLogicalSlot = intent.getIntExtra("selectedLogicalSlot", 0),
-            "",
+            smdp = "",
-            null,
+            matchingId = null,
-            null,
+            confirmationCode = null,
-            null,
+            imei = null,
-            false,
+            downloadStarted = false,
-            -1,
+            downloadTaskID = -1,
-            null
+            downloadError = null
         )
 
         progressBar = requireViewById(R.id.progress)
@@ -254,18 +253,28 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         }
     }
 
+    internal fun getActivationCodeFromIntent(): String? {
+        val uri = intent.data ?: return null
+        if (uri.scheme != "lpa") return null
+        return uri.schemeSpecificPart
+    }
+
     abstract class DownloadWizardStepFragment : Fragment(), OpenEuiccContextMarker {
         protected val state: DownloadWizardState
-            get() = (requireActivity() as DownloadWizardActivity).state
+            get() = requireWizardActivity().state
 
         abstract val hasNext: Boolean
         abstract val hasPrev: Boolean
         abstract fun createNextFragment(): DownloadWizardStepFragment?
         abstract fun createPrevFragment(): DownloadWizardStepFragment?
 
+        protected fun requireWizardActivity(): DownloadWizardActivity {
+            return requireActivity() as DownloadWizardActivity
+        }
+
         protected fun gotoNextFragment(next: DownloadWizardStepFragment? = null) {
             val realNext = next ?: createNextFragment()
-            (requireActivity() as DownloadWizardActivity).showFragment(
+            requireWizardActivity().showFragment(
                 realNext!!,
                 R.anim.slide_in_right,
                 R.anim.slide_out_left
@@ -273,11 +282,11 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         }
 
         protected fun hideProgressBar() {
-            (requireActivity() as DownloadWizardActivity).progressBar.visibility = View.GONE
+            requireWizardActivity().progressBar.visibility = View.GONE
         }
 
         protected fun showProgressBar(progressValue: Int) {
-            (requireActivity() as DownloadWizardActivity).progressBar.apply {
+            requireWizardActivity().progressBar.apply {
                 visibility = View.VISIBLE
                 if (progressValue >= 0) {
                     isIndeterminate = false
@@ -289,7 +298,7 @@ class DownloadWizardActivity: BaseEuiccAccessActivity() {
         }
 
         protected fun refreshButtons() {
-            (requireActivity() as DownloadWizardActivity).refreshButtons()
+            requireWizardActivity().refreshButtons()
         }
 
         open fun beforeNext() {}

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

@@ -35,8 +35,12 @@ class DownloadWizardDetailsFragment : DownloadWizardActivity.DownloadWizardStepF
     override fun createNextFragment(): DownloadWizardActivity.DownloadWizardStepFragment =
         DownloadWizardProgressFragment()
 
-    override fun createPrevFragment(): DownloadWizardActivity.DownloadWizardStepFragment =
+    override fun createPrevFragment(): DownloadWizardActivity.DownloadWizardStepFragment {
-        DownloadWizardMethodSelectFragment()
+        if (requireWizardActivity().getActivationCodeFromIntent() != null) {
+            return DownloadWizardSlotSelectFragment()
+        }
+        return DownloadWizardMethodSelectFragment()
+    }
 
     override fun onCreateView(
         inflater: LayoutInflater,

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

@@ -4,6 +4,7 @@ import android.app.AlertDialog
 import android.content.ClipboardManager
 import android.graphics.BitmapFactory
 import android.os.Bundle
+import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
@@ -21,10 +22,16 @@ import com.journeyapps.barcodescanner.ScanOptions
 import im.angry.openeuicc.common.R
 import im.angry.openeuicc.util.*
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import kotlinx.coroutines.withContext
 
 class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizardStepFragment() {
+    companion object {
+        const val TAG = "DownloadWizardMethodSelectFragment"
+    }
+
     data class DownloadMethod(
         val iconRes: Int,
         val titleRes: Int,
@@ -89,6 +96,11 @@ class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizard
     override fun createPrevFragment(): DownloadWizardActivity.DownloadWizardStepFragment =
         DownloadWizardSlotSelectFragment()
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        requireWizardActivity().getActivationCodeFromIntent()?.let(::processLpaString)
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -125,28 +137,30 @@ class DownloadWizardMethodSelectFragment : DownloadWizardActivity.DownloadWizard
     }
 
     private fun processLpaString(input: String) {
+        if (runBlocking { preferenceRepository.verboseLoggingFlow.first() }) {
+            Log.i(TAG, "Processing LPA string: $input")
+        }
         try {
             val parsed = ActivationCode.fromString(input)
             state.smdp = parsed.address
             state.matchingId = parsed.matchingId
             if (parsed.confirmationCodeRequired) {
-                AlertDialog.Builder(requireContext()).apply {
+                AlertDialog.Builder(requireContext())
-                    setTitle(R.string.profile_download_required_confirmation_code)
+                    .setTitle(R.string.profile_download_required_confirmation_code)
-                    setMessage(R.string.profile_download_required_confirmation_code_message)
+                    .setMessage(R.string.profile_download_required_confirmation_code_message)
-                    setCancelable(true)
+                    .setCancelable(true)
-                    setPositiveButton(android.R.string.ok, null)
+                    .setPositiveButton(android.R.string.ok, null)
-                    show()
+                    .show()
-                }
             }
             gotoNextFragment(DownloadWizardDetailsFragment())
-        } catch (e: IllegalArgumentException) {
+        } catch (e: IllegalStateException) {
-            AlertDialog.Builder(requireContext()).apply {
+            Log.d(TAG, "Failed to parse LPA string", e)
-                setTitle(R.string.profile_download_incorrect_lpa_string)
+            AlertDialog.Builder(requireContext())
-                setMessage(R.string.profile_download_incorrect_lpa_string_message)
+                .setTitle(R.string.profile_download_incorrect_lpa_string)
-                setCancelable(true)
+                .setMessage(R.string.profile_download_incorrect_lpa_string_message)
-                setNegativeButton(android.R.string.cancel, null)
+                .setCancelable(true)
-                show()
+                .setNegativeButton(android.R.string.cancel, null)
-            }
+                .show()
         }
     }
 

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

@@ -7,20 +7,26 @@ data class ActivationCode(
     val confirmationCodeRequired: Boolean = false,
 ) {
     companion object {
-        fun fromString(input: String): ActivationCode {
+        fun fromString(token: String): ActivationCode {
-            val components = input.removePrefix("LPA:").split('$')
+            val input = if (token.startsWith("LPA:", true)) token.drop(4) else token
-            if (components.size < 2 || components[0] != "1") {
+            val components = input.split('$').map { it.trim().ifEmpty { null } }
-                throw IllegalArgumentException("Invalid activation code format")
+            check(components.size >= 2) { "Invalid activation code format" }
-            }
+            check(components[0] == "1") { "Invalid activation code version" }
             return ActivationCode(
-                address = components[1].trim(),
+                checkNotNull(components[1]) { "Invalid SM-DP+ address" },
-                matchingId = components.getOrNull(2)?.trim()?.ifBlank { null },
+                components.getOrNull(2),
-                oid = components.getOrNull(3)?.trim()?.ifBlank { null },
+                components.getOrNull(3),
-                confirmationCodeRequired = components.getOrNull(4)?.trim() == "1"
+                components.getOrNull(4) == "1",
             )
         }
     }
 
+    init {
+        check(isFQDN(address)) { "Invalid SM-DP+ address" }
+        check(matchingId == null || isMatchingID(matchingId)) { "Invalid Matching ID" }
+        check(oid == null || isObjectIdentifier(oid)) { "Invalid OID" }
+    }
+
     override fun toString(): String {
         val parts = arrayOf(
             "1",
@@ -31,4 +37,40 @@ data class ActivationCode(
         )
         return parts.joinToString("$").trimEnd('$')
     }
-}
+}
+
+/**
+ * SGP.22 4.1 Activation Code (v2.2.2, p111)
+ *
+ * FQDN (Fully Qualified Domain Name) of the SM-DP+ (e.g., SMDP.GSMA.COM)
+ * restricted to the Alphanumeric mode character set defined in table 5 of ISO/IEC 18004 [15]
+ * excluding '$'
+ */
+private fun isFQDN(input: CharSequence): Boolean {
+    if (input.isEmpty() || input.length > 255) return false
+    val parts = input.split('.')
+    if (parts.size < 2) return false
+    for (part in parts) {
+        if (part.isEmpty() || part.length > 63) return false
+        if (part.all { it.isLetterOrDigit() || it == '-' }) continue
+        return false
+    }
+    return true
+}
+
+/**
+ * SGP.22 4.1.1 Matching ID (v2.2.2, p112)
+ *
+ * Matching ID is a string of alphanumeric characters and hyphens.
+ */
+private fun isMatchingID(input: CharSequence) =
+    input.all { it.isLetterOrDigit() || it == '-' }
+
+/**
+ * SGP.22 4.1 Activation Code (v2.2.2, p111)
+ *
+ * SM-DP+ OID in the CERT.DPauth.ECDSA
+ */
+private fun isObjectIdentifier(input: CharSequence) = input.length < 255 &&
+        input.count { it == '.' } > 2 &&
+        input.split('.').all { it.isNotEmpty() && it.all(Char::isDigit) }