[wallet] show ToS markdown in expandable sections

3 files changed, 180 insertions, 4 deletions

diff --git a/wallet/src/main/java/net/taler/wallet/withdraw/ReviewExchangeTosFragment.kt b/wallet/src/main/java/net/taler/wallet/withdraw/ReviewExchangeTosFragment.kt
index 47b6f14..ffaef5a 100644
--- a/wallet/src/main/java/net/taler/wallet/withdraw/ReviewExchangeTosFragment.kt
+++ b/wallet/src/main/java/net/taler/wallet/withdraw/ReviewExchangeTosFragment.kt
@@ -16,7 +16,6 @@
 
 package net.taler.wallet.withdraw
 
-
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -25,16 +24,20 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.Observer
 import androidx.navigation.fragment.findNavController
+import io.noties.markwon.Markwon
 import kotlinx.android.synthetic.main.fragment_review_exchange_tos.*
 import net.taler.common.fadeIn
 import net.taler.common.fadeOut
-import net.taler.wallet.R
 import net.taler.wallet.MainViewModel
+import net.taler.wallet.R
+import java.text.ParseException
 
 class ReviewExchangeTosFragment : Fragment() {
 
     private val model: MainViewModel by activityViewModels()
     private val withdrawManager by lazy { model.withdrawManager }
+    private val markwon by lazy { Markwon.builder(requireContext()).build() }
+    private val adapter by lazy { TosAdapter(markwon) }
 
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -53,8 +56,18 @@ class ReviewExchangeTosFragment : Fragment() {
         withdrawManager.withdrawStatus.observe(viewLifecycleOwner, Observer {
             when (it) {
                 is WithdrawStatus.TermsOfServiceReviewRequired -> {
-                    tosTextView.text = it.tosText
-                    tosTextView.fadeIn()
+                    val sections = try {
+                        // TODO remove next line once exchange delivers proper markdown
+                        val text = it.tosText.replace("****************", "================")
+                        parseTos(markwon, text)
+                    } catch (e: ParseException) {
+                        onTosError(e.message ?: "Unknown Error")
+                        return@Observer
+                    }
+                    adapter.setSections(sections)
+                    tosList.adapter = adapter
+                    tosList.fadeIn()
+
                     acceptTosCheckBox.fadeIn()
                     progressBar.fadeOut()
                 }
@@ -68,4 +81,12 @@ class ReviewExchangeTosFragment : Fragment() {
         })
     }
 
+    private fun onTosError(msg: String) {
+        tosList.fadeIn()
+        progressBar.fadeOut()
+        buttonCard.fadeOut()
+        errorView.text = getString(R.string.exchange_tos_error, "\n\n$msg")
+        errorView.fadeIn()
+    }
+
 }
diff --git a/wallet/src/main/java/net/taler/wallet/withdraw/TosAdapter.kt b/wallet/src/main/java/net/taler/wallet/withdraw/TosAdapter.kt
new file mode 100644
index 0000000..74a798f
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/withdraw/TosAdapter.kt
@@ -0,0 +1,90 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.withdraw
+
+import android.transition.TransitionManager.beginDelayedTransition
+import android.view.LayoutInflater
+import android.view.View
+import android.view.View.GONE
+import android.view.View.VISIBLE
+import android.view.ViewGroup
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import io.noties.markwon.Markwon
+import net.taler.wallet.R
+
+class TosAdapter(
+    private val markwon: Markwon
+) : RecyclerView.Adapter<TosAdapter.TosSectionViewHolder>() {
+
+    private val items = ArrayList<TosSection>()
+
+    init {
+        setHasStableIds(true)
+    }
+
+    override fun getItemCount() = items.size
+
+    override fun getItemId(position: Int): Long {
+        return items[position].node.hashCode().toLong()
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TosSectionViewHolder {
+        val v = LayoutInflater.from(parent.context).inflate(R.layout.list_item_tos, parent, false)
+        return TosSectionViewHolder(v)
+    }
+
+    override fun onBindViewHolder(holder: TosSectionViewHolder, position: Int) {
+        holder.bind(items[position])
+    }
+
+    fun setSections(sections: List<TosSection>) {
+        items.clear()
+        items.addAll(sections)
+        notifyDataSetChanged()
+    }
+
+    inner class TosSectionViewHolder(private val v: View) : RecyclerView.ViewHolder(v) {
+        private val sectionTitle: TextView = v.findViewById(R.id.sectionTitle)
+        private val expandButton: ImageView = v.findViewById(R.id.expandButton)
+        private val sectionText: TextView = v.findViewById(R.id.sectionText)
+
+        fun bind(item: TosSection) {
+            sectionTitle.text = item.title
+            showSection(item, item.expanded)
+            val onClickListener = View.OnClickListener {
+                if (!item.expanded) beginDelayedTransition(v as ViewGroup)
+                item.expanded = !item.expanded
+                showSection(item, item.expanded)
+            }
+            sectionTitle.setOnClickListener(onClickListener)
+        }
+
+        private fun showSection(item: TosSection, show: Boolean) {
+            if (show) {
+                expandButton.setImageResource(R.drawable.ic_keyboard_arrow_up)
+                markwon.setParsedMarkdown(sectionText, markwon.render(item.node))
+                sectionText.visibility = VISIBLE
+            } else {
+                expandButton.setImageResource(R.drawable.ic_keyboard_arrow_down)
+                sectionText.visibility = GONE
+            }
+        }
+    }
+
+}
diff --git a/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt b/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt
new file mode 100644
index 0000000..72a9e34
--- /dev/null
+++ b/wallet/src/main/java/net/taler/wallet/withdraw/TosSection.kt
@@ -0,0 +1,65 @@
+/*
+ * This file is part of GNU Taler
+ * (C) 2020 Taler Systems S.A.
+ *
+ * GNU Taler is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 3, or (at your option) any later version.
+ *
+ * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ * A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package net.taler.wallet.withdraw
+
+import io.noties.markwon.Markwon
+import org.commonmark.node.Document
+import org.commonmark.node.Heading
+import org.commonmark.node.Node
+import org.commonmark.node.Text
+import java.text.ParseException
+
+data class TosSection(
+    val title: String,
+    val node: Node,
+    var expanded: Boolean = false
+)
+
+@Throws(ParseException::class)
+internal fun parseTos(markwon: Markwon, text: String): List<TosSection> {
+    var node: Node? =
+        markwon.parse(text).firstChild ?: throw ParseException("Invalid markdown", 0)
+    var lastHeading: String? = null
+    var section = Document()
+    val sections = ArrayList<TosSection>()
+    while (node != null) {
+        val next: Node? = node.next
+        if (node is Heading && node.level == 1) {
+            // if lastHeading exists, close previous section
+            if (lastHeading != null) {
+                sections.add(TosSection(lastHeading, section))
+                section = Document()
+            }
+            // check that this is a plain heading
+            if (node.firstChild !is Text || node.firstChild.next != null) {
+                throw ParseException(
+                    "Primary heading includes more than just text", sections.size
+                )
+            }
+            // start new section
+            lastHeading = (node.firstChild as Text).literal
+        } else if (lastHeading == null) {
+            throw ParseException("Found text before first primary heading", 0)
+        } else {
+            section.appendChild(node)
+        }
+        node = next
+    }
+    check(lastHeading != null)
+    sections.add(TosSection(lastHeading, section))
+    return sections
+}