Federation Data Exchange for FE2

fe2-android/app/src/main/java/com/github/dedis/popstellar/di/DataRegistryModule.kt

@@ -19,6 +19,8 @@ import com.github.dedis.popstellar.model.network.method.message.data.election.El
 import com.github.dedis.popstellar.model.network.method.message.data.election.ElectionResult
 import com.github.dedis.popstellar.model.network.method.message.data.election.ElectionSetup
 import com.github.dedis.popstellar.model.network.method.message.data.federation.Challenge
+import com.github.dedis.popstellar.model.network.method.message.data.federation.FederationResult
+import com.github.dedis.popstellar.model.network.method.message.data.federation.TokensExchange
 import com.github.dedis.popstellar.model.network.method.message.data.lao.CreateLao
 import com.github.dedis.popstellar.model.network.method.message.data.lao.GreetLao
 import com.github.dedis.popstellar.model.network.method.message.data.lao.StateLao
@@ -259,6 +261,18 @@ object DataRegistryModule {
       linkedOrganizationsHandler.handleChallenge(context, challenge)
     }
 
+    builder.add(Objects.FEDERATION, Action.RESULT, FederationResult::class.java) {
+        context: HandlerContext,
+        result: FederationResult ->
+      linkedOrganizationsHandler.handleResult(context, result)
+    }
+
+    builder.add(Objects.FEDERATION, Action.TOKENS_EXCHANGE, TokensExchange::class.java) {
+        context: HandlerContext,
+        tokenExchange: TokensExchange ->
+      linkedOrganizationsHandler.handleTokensExchange(context, tokenExchange)
+    }
+
     return builder.build()
   }
 
@@ -327,6 +341,8 @@ object DataRegistryModule {
 
     // Federation
     builder.add(Objects.FEDERATION, Action.CHALLENGE, Challenge::class.java, null)
+    builder.add(Objects.FEDERATION, Action.RESULT, FederationResult::class.java, null)
+    builder.add(Objects.FEDERATION, Action.TOKENS_EXCHANGE, TokensExchange::class.java, null)
 
     return builder.build()
   }

fe2-android/app/src/main/java/com/github/dedis/popstellar/model/network/method/message/data/Action.kt

@@ -44,6 +44,7 @@ enum class Action
   CHALLENGE("challenge"),
   INIT("init"),
   EXPECT("expect"),
+  TOKENS_EXCHANGE("tokens_exchange"),
   RUMOR("rumor");
 
   /**

fe2-android/app/src/main/java/com/github/dedis/popstellar/model/network/method/message/data/federation/FederationResult.kt

@@ -0,0 +1,82 @@
+package com.github.dedis.popstellar.model.network.method.message.data.federation
+
+import com.github.dedis.popstellar.model.network.method.message.MessageGeneral
+import com.github.dedis.popstellar.model.network.method.message.data.Action
+import com.github.dedis.popstellar.model.network.method.message.data.Data
+import com.github.dedis.popstellar.model.network.method.message.data.Objects
+import com.google.gson.annotations.SerializedName
+
+/** Informs about the result of the authentication procedure */
+class FederationResult
+/**
+ * Constructor for a data Federation Result
+ *
+ * @param status status of the result (either success or failure)
+ * @param reason reason of the failure
+ * @param publicKey public key of the other LAO organizer
+ * @param challenge challenge used to connect the LAOs
+ */
+(
+    val status: String,
+    val reason: String? = null,
+    @SerializedName("public_key") val publicKey: String? = null,
+    val challenge: MessageGeneral,
+) : Data {
+
+  init {
+    when (status) {
+      FAILURE -> {
+        require(reason != null) { "Reason must be provided for $FAILURE status." }
+        require(publicKey == null) { "Public key must be null for $FAILURE status." }
+      }
+      SUCCESS -> {
+        require(publicKey != null) { "Public key must be provided for $SUCCESS status." }
+        require(reason == null) { "Reason must be null for $SUCCESS status." }
+      }
+      else -> throw IllegalArgumentException("Status must be either '$FAILURE' or '$SUCCESS'.")
+    }
+  }
+
+  override val `object`: String
+    get() = Objects.FEDERATION.`object`
+
+  override val action: String
+    get() = Action.RESULT.action
+
+  override fun equals(other: Any?): Boolean {
+    if (this === other) {
+      return true
+    }
+    if (other == null || javaClass != other.javaClass) {
+      return false
+    }
+    val that = other as FederationResult
+    return status == that.status &&
+        reason == that.reason &&
+        publicKey == that.publicKey &&
+        challenge == that.challenge
+  }
+
+  override fun hashCode(): Int {
+    return java.util.Objects.hash(status, reason, publicKey, challenge)
+  }
+
+  override fun toString(): String {
+    if (status == FAILURE) {
+      return "FederationResult{status='$status', reason='$reason', challenge='$challenge'}"
+    } else if (status == SUCCESS) {
+      return "FederationResult{status='$status', public_key='$publicKey', " +
+          "challenge='$challenge'}"
+    }
+    return "FederationResult{ERROR}"
+  }
+
+  fun isSuccess(): Boolean {
+    return status == SUCCESS
+  }
+
+  companion object {
+    private const val SUCCESS = "success"
+    private const val FAILURE = "failure"
+  }
+}

fe2-android/app/src/main/java/com/github/dedis/popstellar/model/network/method/message/data/federation/TokensExchange.kt

@@ -0,0 +1,52 @@
+package com.github.dedis.popstellar.model.network.method.message.data.federation
+
+import com.github.dedis.popstellar.model.network.method.message.data.Action
+import com.github.dedis.popstellar.model.network.method.message.data.Data
+import com.github.dedis.popstellar.model.network.method.message.data.Objects
+import com.google.gson.annotations.SerializedName
+
+/** Token exchange to be broadcast in the LAO */
+class TokensExchange
+/**
+ * Constructor for a data TokenExchange
+ *
+ * @param laoId ID of the remote LAO
+ * @param rollCallId ID of the rollCall of the remote LAO
+ * @param tokens array of tokens contained in the rollCall
+ * @param timestamp timestamp of the message
+ */
+(
+    @SerializedName("lao_id") val laoId: String,
+    @SerializedName("roll_call_id") val rollCallId: String,
+    val tokens: Array<String>,
+    val timestamp: Long
+) : Data {
+  override val `object`: String
+    get() = Objects.FEDERATION.`object`
+
+  override val action: String
+    get() = Action.TOKENS_EXCHANGE.action
+
+  override fun equals(other: Any?): Boolean {
+    if (this === other) {
+      return true
+    }
+    if (other == null || javaClass != other.javaClass) {
+      return false
+    }
+    val that = other as TokensExchange
+    return laoId == that.laoId &&
+        rollCallId == that.rollCallId &&
+        tokens.contentEquals(that.tokens) &&
+        timestamp == that.timestamp
+  }
+
+  override fun hashCode(): Int {
+    return java.util.Objects.hash(laoId, rollCallId, tokens, timestamp)
+  }
+
+  override fun toString(): String {
+    return "TokensExchange{lao_id='$laoId', roll_call_id='$rollCallId', " +
+        "tokens='$tokens', timestamp='$timestamp'}"
+  }
+}

fe2-android/app/src/main/java/com/github/dedis/popstellar/model/objects/Chirp.kt

@@ -13,14 +13,16 @@ class Chirp : Copyable<Chirp> {
   val timestamp: Long
   val isDeleted: Boolean
   val parentId: MessageID
+  val laoId: String
 
   constructor(
       id: MessageID,
       sender: PublicKey,
       text: String,
       timestamp: Long,
       isDeleted: Boolean,
-      parentId: MessageID
+      parentId: MessageID,
+      laoId: String
   ) {
     require(id.encoded.isNotEmpty()) { "The id of the Chirp is empty" }
     require(timestamp >= 0) { "The timestamp of the Chirp is negative" }
@@ -32,15 +34,17 @@ class Chirp : Copyable<Chirp> {
     this.timestamp = timestamp
     this.parentId = parentId
     this.isDeleted = isDeleted
+    this.laoId = laoId
   }
 
   constructor(
       id: MessageID,
       sender: PublicKey,
       text: String,
       timestamp: Long,
-      parentId: MessageID
-  ) : this(id, sender, text, timestamp, false, parentId)
+      parentId: MessageID,
+      laoId: String
+  ) : this(id, sender, text, timestamp, false, parentId, laoId)
 
   constructor(chirp: Chirp, deleted: Boolean) {
     id = chirp.id
@@ -49,6 +53,7 @@ class Chirp : Copyable<Chirp> {
     timestamp = chirp.timestamp
     parentId = chirp.parentId
     isDeleted = deleted
+    laoId = chirp.laoId
   }
 
   constructor(chirp: Chirp) {
@@ -58,6 +63,7 @@ class Chirp : Copyable<Chirp> {
     timestamp = chirp.timestamp
     isDeleted = chirp.isDeleted
     parentId = chirp.parentId
+    laoId = chirp.laoId
   }
 
   override fun copy(): Chirp {

fe2-android/app/src/main/java/com/github/dedis/popstellar/repository/LinkedOrganizationsRepository.kt

@@ -13,15 +13,14 @@ import javax.inject.Singleton
 class LinkedOrganizationsRepository @Inject constructor() {
   private var challenge: Challenge? = null
   private var onChallengeUpdatedCallback: ((Challenge) -> Unit)? = null
+  private var linkedLaos: MutableMap<String, MutableMap<String, Array<String>>> = mutableMapOf()
+  private var onLinkedLaosUpdatedCallback: ((String, MutableMap<String, Array<String>>) -> Unit)? =
+      null
+  private var newTokensNotifyFunction: ((String, String, String, Array<String>) -> Unit)? = null
   var otherLaoId: String? = null
   var otherServerAddr: String? = null
   var otherPublicKey: String? = null
 
-  /**
-   * Updates the challenge
-   *
-   * @param challenge the new Challenge
-   */
   fun updateChallenge(challenge: Challenge) {
     this.challenge = challenge
     onChallengeUpdatedCallback?.invoke(challenge)
@@ -35,6 +34,36 @@ class LinkedOrganizationsRepository @Inject constructor() {
     return challenge
   }
 
+  fun addLinkedLao(laoId: String, otherLaoId: String, tokens: Array<String>) {
+    val laoMap = linkedLaos.getOrPut(laoId) { mutableMapOf() }
+    laoMap[otherLaoId] = tokens
+    onLinkedLaosUpdatedCallback?.invoke(laoId, laoMap)
+  }
+
+  fun updateAndNotifyLinkedLao(
+      laoId: String,
+      otherLaoId: String,
+      tokens: Array<String>,
+      rollCallId: String
+  ) {
+    addLinkedLao(laoId, otherLaoId, tokens)
+    newTokensNotifyFunction?.invoke(laoId, otherLaoId, rollCallId, tokens)
+  }
+
+  fun setOnLinkedLaosUpdatedCallback(
+      callback: (String, MutableMap<String, Array<String>>) -> Unit
+  ) {
+    onLinkedLaosUpdatedCallback = callback
+  }
+
+  fun setNewTokensNotifyFunction(function: (String, String, String, Array<String>) -> Unit) {
+    newTokensNotifyFunction = function
+  }
+
+  fun getLinkedLaos(laoId: String): MutableMap<String, Array<String>> {
+    return linkedLaos.getOrDefault(laoId, mutableMapOf())
+  }
+
   fun flush() {
     otherLaoId = null
     otherServerAddr = null

fe2-android/app/src/main/java/com/github/dedis/popstellar/ui/lao/federation/LinkedOrganizationsFragment.kt

@@ -17,6 +17,9 @@ import com.github.dedis.popstellar.ui.lao.event.LaoDetailAnimation.showIn
 import com.github.dedis.popstellar.ui.lao.event.LaoDetailAnimation.showOut
 import com.github.dedis.popstellar.ui.qrcode.QrScannerFragment
 import com.github.dedis.popstellar.ui.qrcode.ScanningAction
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 /**
  * A simple [Fragment] subclass. Use the [LinkedOrganizationsFragment.newInstance] factory method to
@@ -41,9 +44,6 @@ class LinkedOrganizationsFragment : Fragment() {
     linkedOrganizationsViewModel =
         obtainLinkedOrganizationsViewModel(requireActivity(), laoViewModel.laoId)
 
-    // Starts from a clean repository
-    linkedOrganizationsViewModel.flushRepository()
-
     // Sets the text and the button depending on the user's role
     laoViewModel.role.observe(viewLifecycleOwner) { role: Role ->
       if (role == Role.ORGANIZER) {
@@ -59,6 +59,19 @@ class LinkedOrganizationsFragment : Fragment() {
     binding.inviteOtherOrganization.setOnClickListener(invitationPage)
     binding.joinOtherOrganizationInvitation.setOnClickListener(joinButton)
 
+    // Displaying the linked organizations
+    val laos = linkedOrganizationsViewModel.getLinkedLaosMap().keys
+    displayLinkedOrganizations(laos)
+    linkedOrganizationsViewModel.doWhenLinkedLaosIsUpdated { laoId, laoMap ->
+      if (laoId == laoViewModel.laoId) {
+        CoroutineScope(Dispatchers.Main).launch {
+          val currentLaos = laoMap.keys
+          displayLinkedOrganizations(currentLaos)
+        }
+      }
+    }
+
+    linkedOrganizationsViewModel.setLinkedLaosNotifyFunction()
     handleBackNav()
 
     return binding.root
@@ -97,13 +110,27 @@ class LinkedOrganizationsFragment : Fragment() {
 
   private var joinButton =
       View.OnClickListener {
+        linkedOrganizationsViewModel.flushRepository()
         laoViewModel.setIsTab(false)
         linkedOrganizationsViewModel.manager = parentFragmentManager
         LaoActivity.setCurrentFragment(parentFragmentManager, R.id.fragment_qr_scanner) {
           QrScannerFragment.newInstance(ScanningAction.FEDERATION_JOIN)
         }
       }
 
+  private fun displayLinkedOrganizations(laos: Set<String>) {
+    if (laos.isNotEmpty()) {
+      val laosText = laos.joinToString(separator = "\n\n")
+      val textToDisplay = context?.getString(R.string.list_organizations, laosText)
+      binding.noOrganizationsText.visibility = View.GONE
+      binding.listOrganizationsText.visibility = View.VISIBLE
+      binding.listOrganizationsText.text = textToDisplay
+    } else {
+      binding.listOrganizationsText.visibility = View.GONE
+      binding.noOrganizationsText.visibility = View.VISIBLE
+    }
+  }
+
   private fun handleBackNav() {
     LaoActivity.addBackNavigationCallbackToEvents(requireActivity(), viewLifecycleOwner, TAG)
   }

fe2-android/app/src/main/java/com/github/dedis/popstellar/ui/lao/federation/LinkedOrganizationsInviteFragment.kt

@@ -106,13 +106,19 @@ class LinkedOrganizationsInviteFragment(createsInvitation: Boolean) : Fragment()
   }
 
   private fun createInvitationSetup(binding: LinkedOrganizationsInviteFragmentBinding) {
+    // Setup buttons
     binding.nextStepButton.setText(R.string.next_step)
     binding.nextStepButton.visibility = View.GONE
     binding.nextStepButton.setOnClickListener { openScanner() }
     binding.scanQrText.visibility = View.GONE
     binding.loadingText.visibility = View.VISIBLE
     binding.linkedOrganizationsNameTitle.visibility = View.GONE
     binding.linkedOrganizationsServerTitle.visibility = View.GONE
+
+    // Starts with a clean repository
+    linkedOrganizationsViewModel.flushRepository()
+
+    // Sends the challenge request
     laoViewModel.addDisposable(
         linkedOrganizationsViewModel
             .sendChallengeRequest(Instant.now().epochSecond)