diff --git a/web/chatview.html b/web/chatview.html
index f4df001..cd88dbf 100644
--- a/web/chatview.html
+++ b/web/chatview.html
@@ -71,7 +71,7 @@
                 <path d="M0 0h24v24H0z" fill="none"/>
             </svg>
         </div>
-        <textarea id="message" autofocus placeholder="Type a message" onkeyup="grow_text_area()" rows="1" disabled="false"></textarea>
+        <textarea id="message" autofocus placeholder="Type a message" onkeyup="grow_text_area()" onkeydown="process_messagebar_keydown()" rows="1" disabled="false"></textarea>
         <div class="nav-button action-button" onclick="sendMessage()" title="Send">
             <svg class="svgicon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">
                 <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/>
@@ -83,335 +83,420 @@
 </body>
 
 <script>
+"use strict"
 
 /* Constants used at several places*/
-const messageBarPlaceHolder = "Type a message";
-const avatar_size = 35;
-var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame;
-var displayLinksEnabled = false;
-var historyBufferIndex = 0; // When showing a large amount of interactions, this counter store the interaction's index to show
-var historyBuffer = []; // Before showing a large amount of interactions, this array is used as a buffer.
-var hoverBackButtonAllowed = true;
+const messageBarPlaceHolder = "Type a message"
+const avatar_size = 35
+var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame
+var displayLinksEnabled = false
+var historyBufferIndex = 0 // When showing a large amount of interactions, this counter store the interaction's index to show
+var historyBuffer = [] // Before showing a large amount of interactions, this array is used as a buffer.
+var hoverBackButtonAllowed = true
 
 /* We retrieve refs to the most used navbar and message bar elements for efficiency purposes */
 /* NOTE: always use getElementById when possible, way more efficient */
-const backButton        = document.getElementById("backButton");
-const aliasField        = document.getElementById("nav-contactid-alias");
-const bestIdField       = document.getElementById("nav-contactid-bestId");
-const idField           = document.getElementById("nav-contactid");
-const messageBar        = document.getElementById('sendMessage');
-const messageBarInput   = document.getElementById("message");
-const messages          = document.getElementById("messages");
-const addToConvButton   = document.getElementById("addToConversationsButton");
-const invitation        = document.getElementById("invitation");
-const invitationText    = document.getElementById('text');
-const callButtons       = document.getElementById("callButtons");
-const addBannedContactButton = document.getElementById("addBannedContactButton");
+const backButton        = document.getElementById("backButton")
+const aliasField        = document.getElementById("nav-contactid-alias")
+const bestIdField       = document.getElementById("nav-contactid-bestId")
+const idField           = document.getElementById("nav-contactid")
+const messageBar        = document.getElementById("sendMessage")
+const messageBarInput   = document.getElementById("message")
+const messages          = document.getElementById("messages")
+const addToConvButton   = document.getElementById("addToConversationsButton")
+const invitation        = document.getElementById("invitation")
+const navbar            = document.getElementById("navbar")
+const invitationText    = document.getElementById("text")
 
 /* States: allows us to avoid re-doing something if it isn't meaningful */
-var isBanned = false;
-var isTemporary = false;
-var hasInvitation = false;
+var isBanned = false
+var isTemporary = false
+var hasInvitation = false
 
-messageBarInput.addEventListener("keydown", function (e) {
-    e = e || event;
-    var map = {};
-    map[e.keyCode] = e.type == 'keydown';
-    if (e.ctrlKey || e.shiftKey) {
-      return true;
-    }
-    if (map[13]) {
-      sendMessage();
-      e.preventDefault();
-    }
-    return true;
-});
-
-/* Update general view info */
+/**
+ * Update common frame between conversations.
+ *
+ * Whenever the current conversation is switched, information from the navbar
+ * and message bar have to be updated to match new contact. This function
+ * handles most of the required work (except the showing/hiding the invitation,
+ * which is handled by showInvitation()).
+ *
+ * @param banned 	whether contact is banned or not
+ * @param temporary	whether contact is temporary or not
+ * @param alias
+ * @param bestId
+ */
+/* exported update_chatview_frame */
 function update_chatview_frame(banned, temporary, alias, bestid) {
-  navbar.style.display = "none";
+    navbar.style.display = "none"
 
-  hoverBackButtonAllowed = true;
+    hoverBackButtonAllowed = true
 
-  aliasField.innerHTML = (alias ? alias : bestid);
+    aliasField.innerHTML = (alias ? alias : bestid)
 
-  if(alias) {
-      bestIdField.innerHTML = bestid;
-      idField.classList.remove("oneEntry");
-  } else {
-      idField.classList.add("oneEntry");
-  }
+    if(alias) {
+        bestIdField.innerHTML = bestid
+        idField.classList.remove("oneEntry")
+    } else {
+        idField.classList.add("oneEntry")
+    }
 
-  if (isBanned !== banned) {
-      isBanned = banned;
-      hideMessageBar(banned);
+    if (isBanned !== banned) {
+        isBanned = banned
+        hideMessageBar(banned)
 
-      if(banned) {
-          // contact is banned. update navbar and states
-          navbar.classList.add('onBannedState');
-      } else {
-          navbar.classList.remove('onBannedState');
-      }
-  } else if (isTemporary !== temporary) {
-      isTemporary = temporary;
-      if (temporary) {
-          addToConvButton.style.display = 'flex';
-          messageBarInput.placeholder = "Note: an interaction will create a new contact.";
-      } else {
-          addToConvButton.style.display = '';
-          messageBarInput.placeholder = messageBarPlaceHolder;
-      }
-  }
+        if(banned) {
+            // contact is banned. update navbar and states
+            navbar.classList.add("onBannedState")
+        } else {
+            navbar.classList.remove("onBannedState")
+        }
+    } else if (isTemporary !== temporary) {
+        isTemporary = temporary
+        if (temporary) {
+            addToConvButton.style.display = "flex"
+            messageBarInput.placeholder = "Note: an interaction will create a new contact."
+        } else {
+            addToConvButton.style.display = ""
+            messageBarInput.placeholder = messageBarPlaceHolder
+        }
+    }
 
-  navbar.style.display = "";
+    navbar.style.display = ""
 }
 
 /**
- * Hide or show invitation. Invitation is hidden if no contactAlias/invalid alias is passed.
+ * Hide or show invitation.
+ *
+ * Invitation is hidden if no contactAlias/invalid alias is passed.
  * Otherwise, invitation div is updated.
- * @param  contactAlias
+ *
+ * @param contactAlias
  */
+/* exported showInvitation */
 function showInvitation(contactAlias) {
-  if (!contactAlias) {
-      if (hasInvitation) {
-          hasInvitation = false;
-          invitation.style.visibility = '';
-      }
-  } else {
-      hasInvitation = true;
-      invitationText.innerHTML = '<h1>' + contactAlias + ' sends you an invitation</h1>'
-      + 'Do you want to add them to the conversations list?<br>'
-      + 'Note: you can automatically accept this invitation by sending a message.';
-      invitation.style.visibility = 'visible';
-  }
+    if (!contactAlias) {
+        if (hasInvitation) {
+            hasInvitation = false
+            invitation.style.visibility = ""
+        }
+    } else {
+        hasInvitation = true
+        invitationText.innerHTML = "<h1>" + contactAlias + " sends you an invitation</h1>"
+      + "Do you want to add them to the conversations list?<br>"
+      + "Note: you can automatically accept this invitation by sending a message."
+        invitation.style.visibility = "visible"
+    }
 }
 
 /**
  * Hide or show navbar, and update body top padding accordingly.
+ *
+ * @param isVisible whether navbar should be displayed or not
  */
+/* exported displayNavbar */
 function displayNavbar(isVisible)
 {
     if (isVisible) {
-        navbar.classList.remove("hiddenState");
-        document.documentElement.style.setProperty('--navbar-size', undefined);
+        navbar.classList.remove("hiddenState")
+        document.documentElement.style.setProperty("--navbar-size", undefined)
     } else {
-        navbar.classList.add("hiddenState");
-        document.documentElement.style.setProperty('--navbar-size', '0');
+        navbar.classList.add("hiddenState")
+        document.documentElement.style.setProperty("--navbar-size", "0")
     }
 }
 
 /**
  * Hide or show message bar, and update body bottom padding accordingly.
+ *
+ * @param isHidden whether message bar should be displayed or not
  */
+/* exported hideMessageBar */
 function hideMessageBar(isHidden) {
     if (isHidden) {
-        messageBar.classList.add("hiddenState");
-        document.documentElement.style.setProperty('--messagebar-size', '0');
+        messageBar.classList.add("hiddenState")
+        document.body.style.setProperty("--messagebar-size", "0")
     } else {
-        messageBar.classList.remove("hiddenState");
-        document.documentElement.style.removeProperty('--messagebar-size');
+        messageBar.classList.remove("hiddenState")
+        document.body.style.removeProperty("--messagebar-size")
     }
 }
 
+/* exported setDisplayLinks */
+function setDisplayLinks(display) {
+    displayLinksEnabled = display
+}
+
+/**
+ * This event handler dynamically resizes the message bar depending on the amount of
+ * text entered, while adjusting the body paddings so that that the message bar doesn't
+ * overlap messages when it grows.
+ */
+/* exported grow_text_area */
 function grow_text_area() {
-  var is_at_bottom = messages.scrollTop === (messages.scrollHeight - messages.offsetHeight);
+    var is_at_bottom = messages.scrollTop === (messages.scrollHeight - messages.offsetHeight)
 
-  var old_height = messageBarInput.style.height;
-  messageBarInput.style.height = "auto";
-  messageBarInput.style.height = messageBarInput.scrollHeight +"px";
+    var old_height = window.getComputedStyle(messageBar).height
+    messageBarInput.style.height = "auto" /* <-- necessary, no clue why */
+    messageBarInput.style.height = messageBarInput.scrollHeight + "px"
+    var new_height = window.getComputedStyle(messageBar).height
 
-  if (is_at_bottom) {
-    messages.scrollTop = messages.scrollHeight;
-  }
+    var msgbar_size = window.getComputedStyle(document.body).getPropertyValue("--messagebar-size")
+    var total_size = parseInt(msgbar_size) + parseInt(new_height) - parseInt(old_height)
+
+    document.body.style.setProperty("--messagebar-size", total_size.toString() + "px")
+
+    if (is_at_bottom) {
+        messages.scrollTop = messages.scrollHeight
+    }
+}
+
+/**
+ * This event handler processes keydown events in the navbar. When pressed key is
+ * the enter key, send the message unless shift or control was pressed too.
+ *
+ * @param key the pressed key
+ */
+/* exported process_messagebar_keydown */
+function process_messagebar_keydown(key) {
+    key = key || event
+    var map = {}
+    map[key.keyCode] = key.type == "keydown"
+    if (key.ctrlKey || key.shiftKey) {
+        return true
+    }
+    if (map[13]) {
+        sendMessage()
+        key.preventDefault()
+    }
+    return true
+}
+
+/**
+ * Disable or enable textarea.
+ *
+ * @param isDisabled whether message bar should be enabled or disabled
+ */
+/* exported disableSendMessage */
+function disableSendMessage(isDisabled)
+{
+    messageBarInput.disabled = isDisabled
+}
+
+/**
+ * This event handler adds the hover property back to the "back to welcome view"
+ * button.
+ *
+ * This is a hack. It needs some explanations.
+ *
+ * Problem: Whenever the "back to welcome view" button is clicked, the webview
+ * freezes and the GTK ring welcome view is displayed. While the freeze
+ * itself is perfectly fine (probably necessary for good performances), this
+ * is a big problem for us when the user opens a chatview again: Since the
+ * chatview was freezed, the back button has «remembered» the hover state and
+ * still displays the blue background for a small instant. This is a very bad
+ * looking artefact.
+ *
+ * In order to counter this problem, we introduced the following evil mechanism:
+ * Whenever a user clicks on the "back to welcome view" button, the hover
+ * property is disabled. The hover property stays disabled until the user calls
+ * this event handler by hover-ing the button.
+ */
+/* exported addBackButtonHoverProperty */
+function addBackButtonHoverProperty()
+{
+    if(hoverBackButtonAllowed) {
+        backButton.classList.add("non-action-button")
+    }
 }
 
 /*
- * Update timestamps messages
+ * Update timestamps messages.
  */
 function updateView() {
-    updateTimestamps();
+    updateTimestamps()
 }
 
-setInterval(updateView, 60000);
+setInterval(updateView, 60000)
 
-window.onresize = function(event) {
-  updateTimestamps();
-};
+window.onresize = function() {
+    updateTimestamps()
+}
 
+/* exported addBannedContact */
 function addBannedContact()
 {
-  window.prompt('UNBLOCK');
+    window.prompt("UNBLOCK")
 }
 
+/* exported addToConversations */
 function addToConversations()
 {
-  window.prompt('ADD_TO_CONVERSATIONS');
+    window.prompt("ADD_TO_CONVERSATIONS")
 }
 
-function addBackButtonHoverProperty()
-{
-  if(hoverBackButtonAllowed) {
-      backButton.classList.add("non-action-button");
-  }
-}
-
+/* exported placeCall */
 function placeCall()
 {
-  window.prompt('PLACE_CALL');
+    window.prompt("PLACE_CALL")
 }
 
+/* exported placeAudioCall */
 function placeAudioCall()
 {
-  window.prompt('PLACE_AUDIO_CALL');
+    window.prompt("PLACE_AUDIO_CALL")
 }
 
+/* exported backToWelcomeView */
 function backToWelcomeView()
 {
-  backButton.classList.remove("non-action-button");
-  hoverBackButtonAllowed = false;
-  window.prompt('CLOSE_CHATVIEW');
-}
-
-function setDisplayLinks(display) {
-  displayLinksEnabled = display;
+    backButton.classList.remove("non-action-button")
+    hoverBackButtonAllowed = false
+    window.prompt("CLOSE_CHATVIEW")
 }
 
 /**
  * Transform a date to a string group like "1 hour ago".
+ *
+ * @param date
  */
 function formatDate(date) {
-    const seconds = Math.floor((new Date() - date) / 1000);
-    var interval = Math.floor(seconds / (3600 * 24));
+    const seconds = Math.floor((new Date() - date) / 1000)
+    var interval = Math.floor(seconds / (3600 * 24))
     if (interval > 5) {
-        return date.toLocaleDateString();
+        return date.toLocaleDateString()
     }
     if (interval > 1) {
-        return interval + ' days ago';
+        return interval + " days ago"
     }
     if (interval === 1) {
-        return interval + ' day ago';
+        return interval + " day ago"
     }
-    interval = Math.floor(seconds / 3600);
+    interval = Math.floor(seconds / 3600)
     if (interval > 1) {
-        return interval + ' hours ago';
+        return interval + " hours ago"
     }
     if (interval === 1) {
-        return interval + ' hour ago';
+        return interval + " hour ago"
     }
-    interval = Math.floor(seconds / 60);
+    interval = Math.floor(seconds / 60)
     if (interval > 1) {
-        return interval + ' minutes ago';
+        return interval + " minutes ago"
     }
-    return 'just now';
+    return "just now"
 }
 
 /**
  * Send #sendMessage #message value
  */
- function sendMessage()
- {
-     var message = messageBarInput.value;
-     if (message.length > 0) {
-         messageBarInput.value = '';
-         window.prompt('SEND:' + message);
-     }
- }
-
-/**
-* Disable or enable textarea
-*/
-function disableSendMessage(isDisabled)
+function sendMessage()
 {
-    messageBarInput.disabled = isDisabled;
+    var message = messageBarInput.value
+    if (message.length > 0) {
+        messageBarInput.value = ""
+        window.prompt("SEND:" + message)
+    }
 }
 
+/* exported acceptInvitation */
 function acceptInvitation()
 {
-    window.prompt('ACCEPT');
+    window.prompt("ACCEPT")
 }
 
+/* exported refuseInvitation */
 function refuseInvitation()
 {
-    window.prompt('REFUSE');
+    window.prompt("REFUSE")
 }
 
+/* exported blockConversation */
 function blockConversation()
 {
-    window.prompt('BLOCK');
+    window.prompt("BLOCK")
+}
+
+/* exported sendFile */
+function sendFile()
+{
+    window.prompt("SEND_FILE")
 }
 
 /**
- * Clears all messages
+ * Clear all messages.
  */
+/* exported clearMessages */
 function clearMessages()
 {
-    messages.innerHTML = "";
+    messages.innerHTML = ""
 }
 
 /**
- * Converts text to HTML
+ * Convert text to HTML.
  */
 function escapeHtml(html)
 {
-    var text = document.createTextNode(html);
-    var div = document.createElement('div');
-    div.appendChild(text);
-    return div.innerHTML;
+    var text = document.createTextNode(html)
+    var div = document.createElement("div")
+    div.appendChild(text)
+    return div.innerHTML
 }
 
 
 /**
- * Get the youtube video id from a URI
+ * Get the youtube video id from a URL.
+ * @param url
  */
 function youtube_id(url) {
-    const regExp = /^.*(youtu\.be\/|v\/|\/u\/w|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
-    const match = url.match(regExp);
-    return (match && match[2].length == 11) ? match[2] : null;
+    const regExp = /^.*(youtu\.be\/|v\/|\/u\/w|embed\/|watch\?v=|&v=)([^#&?]*).*/
+    const match = url.match(regExp)
+    return (match && match[2].length == 11) ? match[2] : null
 }
 
 /**
- * Returns HTML message from the message text.
- * Cleaned and linkified.
+ * Returns HTML message from the message text, cleaned and linkified.
+ * @param message_text
  */
 function getMessageHtml(message_text)
 {
-  const escaped_message = escapeHtml(message_text);
-  var linkified_message = linkifyHtml(escaped_message, {});
+    const escaped_message = escapeHtml(message_text)
+    var linkified_message = linkifyHtml(escaped_message, {})  // eslint-disable-line no-undef
 
-  const textPart = document.createElement('pre');
-  textPart.innerHTML = linkified_message;
+    const textPart = document.createElement("pre")
+    textPart.innerHTML = linkified_message
 
-  return textPart.outerHTML;
+    return textPart.outerHTML
 }
 
 /**
  * Returns the message status, formatted for display
+ * @param message_delivery_status
  */
+/* exported getMessageDeliveryStatusText */
 function getMessageDeliveryStatusText(message_delivery_status)
 {
-    var formatted_delivery_status = message_delivery_status;
+    var formatted_delivery_status = message_delivery_status
 
     switch(message_delivery_status)
     {
-        case "sending":
-        case "ongoing":
-            formatted_delivery_status = "Sending<svg overflow='visible' viewBox='0 -2 16 14' height='16px' width='16px'><circle class='status_circle anim-first' cx='4' cy='12' r='1'/><circle class='status_circle anim-second' cx='8' cy='12' r='1'/><circle class='status_circle anim-third' cx='12' cy='12' r='1'/></svg>";
-            break;
-        case "failure":
-            formatted_delivery_status = "Failure <svg overflow='visible' viewBox='0 -2 16 14' height='16px' width='16px'><path class='status-x x-first' stroke='#AA0000' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' fill='none' d='M4,4 L12,12'/><path class='status-x x-second' stroke='#AA0000' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' fill='none' d='M12,4 L4,12'/></svg>";
-            break;
-        case "sent":
-        case "finished":
-        case "unknown":
-        case "read":
-            formatted_delivery_status = "";
-            break;
-        default:
-            console.log("getMessageDeliveryStatusText: unknown delivery status: " + message_delivery_status);
-            break;
+    case "sending":
+    case "ongoing":
+        formatted_delivery_status = "Sending<svg overflow='visible' viewBox='0 -2 16 14' height='16px' width='16px'><circle class='status_circle anim-first' cx='4' cy='12' r='1'/><circle class='status_circle anim-second' cx='8' cy='12' r='1'/><circle class='status_circle anim-third' cx='12' cy='12' r='1'/></svg>"
+        break
+    case "failure":
+        formatted_delivery_status = "Failure <svg overflow='visible' viewBox='0 -2 16 14' height='16px' width='16px'><path class='status-x x-first' stroke='#AA0000' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' fill='none' d='M4,4 L12,12'/><path class='status-x x-second' stroke='#AA0000' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' fill='none' d='M12,4 L4,12'/></svg>"
+        break
+    case "sent":
+    case "finished":
+    case "unknown":
+    case "read":
+        formatted_delivery_status = ""
+        break
+    default:
+        break
     }
 
-    return formatted_delivery_status;
+    return formatted_delivery_status
 }
 
 /**
@@ -419,64 +504,68 @@
  */
 function getMessageTimestampText(message_timestamp, custom_format)
 {
-  const date = new Date(1000 * message_timestamp);
-  if(custom_format) {
-      return formatDate(date);
-  } else {
-      return date.toLocaleString();
-  }
+    const date = new Date(1000 * message_timestamp)
+    if(custom_format) {
+        return formatDate(date)
+    } else {
+        return date.toLocaleString()
+    }
 }
 
 /**
- * Merge timestamps if they are from the same group (likes: "1 hour ago")
+ * Merge timestamps if they are from the same group. For instance, several "1 hour ago"
+ * timestamps will be merged into a single one.
+ *
+ * @param baseNode
+ * @param endIndex
  */
 function cleanPreviousTimestamps (baseNode, endIndex) {
     // Remove previous elements with the same formatted timestamp
     for (var c = endIndex - 1 ; c >= 0 ; --c) {
-        const child = messages.children[c];
-        if (child.className.indexOf('timestamp') !== -1) {
+        const child = messages.children[c]
+        if (child.className.indexOf("timestamp") !== -1) {
             if (child.className === baseNode.className &&
             child.innerHTML === baseNode.innerHTML) {
-                messages.removeChild(child);
+                messages.removeChild(child)
             } else {
-                break; // A different timestamp is met, we can stop here.
+                break // A different timestamp is met, we can stop here.
             }
         }
     }
 }
 
 /**
- * Update timestamps
+ * Update timestamps.
  */
 function updateTimestamps() {
-    const timestamps = messages.querySelectorAll('.timestamp');
-    const is_image_out = messages.querySelector('.message_out .sender_image')
-    const is_image_in = messages.querySelector('.message_in .sender_image')
+    const timestamps = messages.getElementsByClassName(".timestamp")
+    const is_image_out = messages.querySelector(".message_out .sender_image")
+    const is_image_in = messages.querySelector(".message_in .sender_image")
     if (timestamps) {
         for ( var c = 0 ; c < messages.children.length ; ++c) {
-          const child = messages.children[c];
-          if (child.className.indexOf('timestamp') !== -1) {
+            const child = messages.children[c]
+            if (child.className.indexOf("timestamp") !== -1) {
                 // Update timestamp
-                child.innerHTML = getMessageTimestampText(child.getAttribute('message_timestamp'), true)
+                child.innerHTML = getMessageTimestampText(child.getAttribute("message_timestamp"), true)
 
-                var desktop_margin = '25%'
+                var desktop_margin = "25%"
                 const height = document.body.clientHeight
                 const width = document.body.clientWidth
                 if (width <= 1920 || height <= 1080) {
-                  desktop_margin = '15%'
+                    desktop_margin = "15%"
                 }
                 if (width <= 1000 || height <= 480) {
-                  desktop_margin = '0px'
+                    desktop_margin = "0px"
                 }
-                if (child.className.indexOf('timestamp_out') !== -1) {
-                  const avatar_px = is_image_out ? (is_image_out.offsetHeight === avatar_size ? '60px' : '20px') : '20px'
-                  child.style.paddingRight = `calc(${desktop_margin} + ${avatar_px})`
-                } else if (child.className.indexOf('timestamp_in') !== -1) {
-                  const avatar_px = is_image_in ? (is_image_in.offsetHeight === avatar_size ? '60px' : '20px') : '20px'
-                  child.style.paddingLeft = `calc(${desktop_margin} + ${avatar_px})`
+                if (child.className.indexOf("timestamp_out") !== -1) {
+                    const avatar_px = is_image_out ? (is_image_out.offsetHeight === avatar_size ? "60px" : "20px") : "20px"
+                    child.style.paddingRight = `calc(${desktop_margin} + ${avatar_px})`
+                } else if (child.className.indexOf("timestamp_in") !== -1) {
+                    const avatar_px = is_image_in ? (is_image_in.offsetHeight === avatar_size ? "60px" : "20px") : "20px"
+                    child.style.paddingLeft = `calc(${desktop_margin} + ${avatar_px})`
                 }
                 // Remove previous elements with the same formatted timestamp
-                cleanPreviousTimestamps(child, c);
+                cleanPreviousTimestamps(child, c)
             }
         }
     }
@@ -485,43 +574,47 @@
 /**
  * Convert a value in filesize
  */
- function humanFileSize(bytes) {
-    var thresh = 1024;
+function humanFileSize(bytes) {
+    var thresh = 1024
     if(Math.abs(bytes) < thresh) {
-        return bytes + ' B';
+        return bytes + " B"
     }
-    var units = ['kB','MB','GB','TB','PB','EB','ZB','YB']
-    var u = -1;
+    var units = ["kB","MB","GB","TB","PB","EB","ZB","YB"]
+    var u = -1
     do {
-        bytes /= thresh;
-        ++u;
-    } while(Math.abs(bytes) >= thresh && u < units.length - 1);
-    return bytes.toFixed(1)+' '+units[u];
+        bytes /= thresh
+        ++u
+    } while(Math.abs(bytes) >= thresh && u < units.length - 1)
+    return bytes.toFixed(1)+" "+units[u]
 }
 
 /**
- * Change the value of the progress bar
+ * Change the value of the progress bar.
+ *
+ * @param progress_bar
+ * @param message_object
  */
-function updateProgressBar(progress_bar, message_object, message_delivery_status) {
-  var delivery_status = message_object["delivery_status"];
-  if ("progress" in message_object && !isErrorStatus(delivery_status) && message_object["progress"] !== 100) {
-    var progress_percent = (100 * message_object["progress"] / message_object["totalSize"]);
-    if (progress_percent !== 100)
-      progress_bar.childNodes[0].setAttribute("style", "width: " + progress_percent + "%");
-    else
-      progress_bar.setAttribute("style", "display: none");
-  } else
-    progress_bar.setAttribute("style", "display: none");
+function updateProgressBar(progress_bar, message_object) {
+    var delivery_status = message_object["delivery_status"]
+    if ("progress" in message_object && !isErrorStatus(delivery_status) && message_object["progress"] !== 100) {
+        var progress_percent = (100 * message_object["progress"] / message_object["totalSize"])
+        if (progress_percent !== 100)
+            progress_bar.childNodes[0].setAttribute("style", "width: " + progress_percent + "%")
+        else
+            progress_bar.setAttribute("style", "display: none")
+    } else
+        progress_bar.setAttribute("style", "display: none")
 }
 
 /**
  * Check if a status is an error status
+ * @param
  */
 function isErrorStatus(status) {
-  return (status === 'failure'
-         || status === 'awaiting peer timeout'
-         || status === 'canceled'
-         || status === 'unjoinable peer');
+    return (status === "failure"
+         || status === "awaiting peer timeout"
+         || status === "canceled"
+         || status === "unjoinable peer")
 }
 
 /**
@@ -529,142 +622,147 @@
  * @param message_id
  */
 function fileInteraction(message_id) {
-  var message_wrapper = document.createElement('div')
-  message_wrapper.setAttribute('class', 'message_wrapper')
+    var message_wrapper = document.createElement("div")
+    message_wrapper.setAttribute("class", "message_wrapper")
 
-  // An file interaction contains buttons at the left of the interaction
-  // for the status or accept/refuse
-  var left_buttons = document.createElement('div')
-  left_buttons.setAttribute('class', 'left_buttons')
-  message_wrapper.appendChild(left_buttons)
-  // Also contains a bold clickable text
-  var text_div = document.createElement('div')
-  text_div.setAttribute('class', 'text')
-  text_div.addEventListener('click', function (event) {
-    // ask ring to open the file
-    const filename = document.querySelector('#message_' + message_id + ' .full').innerText
-    window.prompt('OPEN_FILE:' + filename)
-  });
-  var full_div = document.createElement('div')
-  full_div.setAttribute('class', 'full')
-  full_div.style = 'visibility: hidden; display: none;'
-  var message_text = document.createElement('div')
-  message_text.setAttribute('class', 'filename')
-  // And some informations like size or error message.
-  var informations_div = document.createElement('div')
-  informations_div.setAttribute('class', 'informations')
-  text_div.appendChild(message_text)
-  text_div.appendChild(full_div)
-  text_div.appendChild(informations_div)
-  message_wrapper.appendChild(text_div)
-  // And finally, a progress bar
-  message_transfer_progress_bar = document.createElement('span')
-  message_transfer_progress_bar.setAttribute('class', 'message_progress_bar')
-  message_transfer_progress_completion = document.createElement('span')
-  message_transfer_progress_bar.appendChild(message_transfer_progress_completion)
-  message_wrapper.appendChild(message_transfer_progress_bar)
-  return message_wrapper
+    /* A file interaction contains buttons at the left for status information
+       or accept/refuse actions. The text is bold and clickable. */
+    var left_buttons = document.createElement("div")
+    left_buttons.setAttribute("class", "left_buttons")
+    message_wrapper.appendChild(left_buttons)
+    var text_div = document.createElement("div")
+    text_div.setAttribute("class", "text")
+
+    text_div.addEventListener("click", function () {
+        // ask ring to open the file
+        const filename = document.querySelector("#message_" + message_id + " .full").innerText
+        window.prompt("OPEN_FILE:" + filename)
+    })
+
+    var full_div = document.createElement("div")
+    full_div.setAttribute("class", "full")
+    full_div.style = "visibility: hidden; display: none;"
+    var message_text = document.createElement("div")
+    message_text.setAttribute("class", "filename")
+
+    // And some informations like size or error message.
+    var informations_div = document.createElement("div")
+    informations_div.setAttribute("class", "informations")
+    text_div.appendChild(message_text)
+    text_div.appendChild(full_div)
+    text_div.appendChild(informations_div)
+    message_wrapper.appendChild(text_div)
+
+    // And finally, a progress bar
+    var message_transfer_progress_bar = document.createElement("span")
+    message_transfer_progress_bar.setAttribute("class", "message_progress_bar")
+    var message_transfer_progress_completion = document.createElement("span")
+    message_transfer_progress_bar.appendChild(message_transfer_progress_completion)
+    message_wrapper.appendChild(message_transfer_progress_bar)
+    return message_wrapper
 }
 
 /**
  * Update a file interaction (icons + filename + status + progress bar)
+ *
  * @param message_div the message to update
  * @param message_object new informations
+ * @param forceTypeToFile
  */
- function updateFileInteraction(message_div, message_object, forceTypeToFile = false) {
-   if (!message_div.querySelector('.informations')) return // media
+function updateFileInteraction(message_div, message_object, forceTypeToFile = false) {
+    if (!message_div.querySelector(".informations")) return // media
 
-   var acceptSvg = '<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z" fill="none"/><path d="M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4L9 16.2z"/></svg>',
-       refuseSvg = '<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z"/><path d="M0 0h24v24H0z" fill="none"/></svg>',
-       fileSvg = '<svg fill="#000000" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M16.5 6v11.5c0 2.21-1.79 4-4 4s-4-1.79-4-4V5c0-1.38 1.12-2.5 2.5-2.5s2.5 1.12 2.5 2.5v10.5c0 .55-.45 1-1 1s-1-.45-1-1V6H10v9.5c0 1.38 1.12 2.5 2.5 2.5s2.5-1.12 2.5-2.5V5c0-2.21-1.79-4-4-4S7 2.79 7 5v12.5c0 3.04 2.46 5.5 5.5 5.5s5.5-2.46 5.5-5.5V6h-1.5z"/><path d="M0 0h24v24H0z" fill="none"/></svg>',
-       warningSvg = '<svg fill="#000000" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z" fill="none"/><path d="M1 21h22L12 2 1 21zm12-3h-2v-2h2v2zm0-4h-2v-4h2v4z"/></svg>'
-   var message_delivery_status = message_object["delivery_status"]
-   var message_direction = message_object["direction"]
-   var message_id = message_object["id"]
-   var message_text = message_object['text']
+    var acceptSvg = "<svg height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M0 0h24v24H0z\" fill=\"none\"/><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4L9 16.2z\"/></svg>",
+        refuseSvg = "<svg height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M19 6.41L17.59 5 12 10.59 6.41 5 5 6.41 10.59 12 5 17.59 6.41 19 12 13.41 17.59 19 19 17.59 13.41 12z\"/><path d=\"M0 0h24v24H0z\" fill=\"none\"/></svg>",
+        fileSvg = "<svg fill=\"#000000\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M16.5 6v11.5c0 2.21-1.79 4-4 4s-4-1.79-4-4V5c0-1.38 1.12-2.5 2.5-2.5s2.5 1.12 2.5 2.5v10.5c0 .55-.45 1-1 1s-1-.45-1-1V6H10v9.5c0 1.38 1.12 2.5 2.5 2.5s2.5-1.12 2.5-2.5V5c0-2.21-1.79-4-4-4S7 2.79 7 5v12.5c0 3.04 2.46 5.5 5.5 5.5s5.5-2.46 5.5-5.5V6h-1.5z\"/><path d=\"M0 0h24v24H0z\" fill=\"none\"/></svg>",
+        warningSvg = "<svg fill=\"#000000\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M0 0h24v24H0z\" fill=\"none\"/><path d=\"M1 21h22L12 2 1 21zm12-3h-2v-2h2v2zm0-4h-2v-4h2v4z\"/></svg>"
+    var message_delivery_status = message_object["delivery_status"]
+    var message_direction = message_object["direction"]
+    var message_id = message_object["id"]
+    var message_text = message_object["text"]
 
 
-   if (isImage(message_text) && message_delivery_status === 'finished' && displayLinksEnabled && !forceTypeToFile) {
-     // Replace the old wrapper by the downloaded image
-     if (message_div.querySelector('.message_wrapper')) {
-       wrapper = message_div.querySelector('.message_wrapper')
-       wrapper.parentNode.removeChild(wrapper)
-     }
-     message_div.append(mediaInteraction(message_id, message_text))
-     message_div.querySelector('img').id = message_id
-     message_div.querySelector('img').msg_obj = message_object
-     message_div.querySelector('img').onerror = function() {
-       message_div = document.getElementById('#message_' + this.id);
-       if (message_div.querySelector('.message_wrapper')) {
-         wrapper = message_div.querySelector('.message_wrapper')
-         wrapper.parentNode.removeChild(wrapper)
-       }
-       message_div.append(fileInteraction(message_id))
-       updateFileInteraction(message_div, this.msg_obj, true)
-     }
-     return
-   }
+    if (isImage(message_text) && message_delivery_status === "finished" && displayLinksEnabled && !forceTypeToFile) {
+        // Replace the old wrapper by the downloaded image
+        if (message_div.querySelector(".message_wrapper")) {
+            var wrapper = message_div.querySelector(".message_wrapper")
+            wrapper.parentNode.removeChild(wrapper)
+        }
+        message_div.append(mediaInteraction(message_id, message_text))
+        message_div.querySelector("img").id = message_id
+        message_div.querySelector("img").msg_obj = message_object
+        message_div.querySelector("img").onerror = function() {
+            message_div = document.getElementById("#message_" + this.id)
+            var wrapper = message_div.querySelector(".message_wrapper")
+            if (wrapper) {
+                wrapper.parentNode.removeChild(wrapper)
+            }
+            message_div.append(fileInteraction(message_id))
+            updateFileInteraction(message_div, this.msg_obj, true)
+        }
+        return
+    }
 
-   // Set informations text
-   var informations_div = message_div.querySelector(".informations");
-   var informations_txt = getMessageTimestampText(message_object["timestamp"], true);
-   if (message_object["totalSize"] && message_object["progress"]) {
-     if (message_delivery_status === 'finished') {
-       informations_txt += " - " + humanFileSize(message_object["totalSize"]);
-     } else {
-       informations_txt += " - " + humanFileSize(message_object["progress"])
-                         + " / " + humanFileSize(message_object["totalSize"]);
-     }
-   }
-   informations_txt += " - " + message_delivery_status;
-   informations_div.innerText = informations_txt;
+    // Set informations text
+    var informations_div = message_div.querySelector(".informations")
+    var informations_txt = getMessageTimestampText(message_object["timestamp"], true)
+    if (message_object["totalSize"] && message_object["progress"]) {
+        if (message_delivery_status === "finished") {
+            informations_txt += " - " + humanFileSize(message_object["totalSize"])
+        } else {
+            informations_txt += " - " + humanFileSize(message_object["progress"])
+                         + " / " + humanFileSize(message_object["totalSize"])
+        }
+    }
+    informations_txt += " - " + message_delivery_status
+    informations_div.innerText = informations_txt
 
-   // Update flat buttons
-   var left_buttons = message_div.querySelector(".left_buttons");
-   left_buttons.innerHTML = '';
-   if (message_delivery_status === 'awaiting peer' || message_delivery_status === 'awaiting host' || message_delivery_status.indexOf('ongoing') === 0) {
-     if (message_direction === 'in' && message_delivery_status.indexOf('ongoing') !== 0) {
-       // add buttons to accept or refuse a call.
-       var accept_button = document.createElement('div');
-       accept_button.innerHTML = acceptSvg;
-       accept_button.setAttribute("title", "Accept");
-       accept_button.setAttribute("class", "flat-button accept");
-       accept_button.onclick = function() {
-         window.prompt('ACCEPT_FILE:' + message_id);
-       }
-       left_buttons.appendChild(accept_button);
-     }
-     var refuse_button = document.createElement('div');
-     refuse_button.innerHTML = refuseSvg;
-     refuse_button.setAttribute("title", "Refuse");
-     refuse_button.setAttribute("class", "flat-button refuse");
-     refuse_button.onclick = function() {
-       window.prompt('REFUSE_FILE:' + message_id);
-     }
-     left_buttons.appendChild(refuse_button);
-   } else {
-     var status_button = document.createElement('div');
-     var statusFile = fileSvg;
-     if (isErrorStatus(message_delivery_status))
-       statusFile = warningSvg;
-     status_button.innerHTML = statusFile;
-     status_button.setAttribute("class", "flat-button");
-     left_buttons.appendChild(status_button);
-   }
+    // Update flat buttons
+    var left_buttons = message_div.querySelector(".left_buttons")
+    left_buttons.innerHTML = ""
+    if (message_delivery_status === "awaiting peer" || message_delivery_status === "awaiting host" || message_delivery_status.indexOf("ongoing") === 0) {
+        if (message_direction === "in" && message_delivery_status.indexOf("ongoing") !== 0) {
+            // add buttons to accept or refuse a call.
+            var accept_button = document.createElement("div")
+            accept_button.innerHTML = acceptSvg
+            accept_button.setAttribute("title", "Accept")
+            accept_button.setAttribute("class", "flat-button accept")
+            accept_button.onclick = function() {
+                window.prompt("ACCEPT_FILE:" + message_id)
+            }
+            left_buttons.appendChild(accept_button)
+        }
+        var refuse_button = document.createElement("div")
+        refuse_button.innerHTML = refuseSvg
+        refuse_button.setAttribute("title", "Refuse")
+        refuse_button.setAttribute("class", "flat-button refuse")
+        refuse_button.onclick = function() {
+            window.prompt("REFUSE_FILE:" + message_id)
+        }
+        left_buttons.appendChild(refuse_button)
+    } else {
+        var status_button = document.createElement("div")
+        var statusFile = fileSvg
+        if (isErrorStatus(message_delivery_status))
+            statusFile = warningSvg
+        status_button.innerHTML = statusFile
+        status_button.setAttribute("class", "flat-button")
+        left_buttons.appendChild(status_button)
+    }
 
-   message_div.querySelector('.full').innerText = message_text
-   message_div.querySelector('.filename').innerText = message_text.split('/').pop()
-   message_div.querySelector('.filename').innerText = message_text.split('/').pop()
-   updateProgressBar(message_div.querySelector('.message_progress_bar'), message_object);
-   updateProgressBar(message_div.querySelector('.message_progress_bar'), message_object);
- }
+    message_div.querySelector(".full").innerText = message_text
+    message_div.querySelector(".filename").innerText = message_text.split("/").pop()
+    message_div.querySelector(".filename").innerText = message_text.split("/").pop()
+    updateProgressBar(message_div.querySelector(".message_progress_bar"), message_object)
+    updateProgressBar(message_div.querySelector(".message_progress_bar"), message_object)
+}
 
 /**
  * Return if a file is an image
  * @param file
  */
 function isImage(file) {
-  return file.toLowerCase().match(/\.(jpeg|jpg|gif|png)$/) !== null
+    return file.toLowerCase().match(/\.(jpeg|jpg|gif|png)$/) !== null
 }
 
 /**
@@ -672,11 +770,11 @@
  * @param file
  */
 function isVideo(file) {
-  const availableProtocols = ['http:', 'https:']
-  const videoHostname = ['youtube.com', 'www.youtube.com', 'youtu.be']
-  const urlParser = document.createElement('a')
-  urlParser.href = file
-  return (availableProtocols.includes(urlParser.protocol) && videoHostname.includes(urlParser.hostname))
+    const availableProtocols = ["http:", "https:"]
+    const videoHostname = ["youtube.com", "www.youtube.com", "youtu.be"]
+    const urlParser = document.createElement("a")
+    urlParser.href = file
+    return (availableProtocols.includes(urlParser.protocol) && videoHostname.includes(urlParser.hostname))
 }
 
 /**
@@ -684,43 +782,44 @@
  * @param message_id
  * @param link to show
  * @param ytid if it's a youtube video
+ * @param
  */
 function mediaInteraction(message_id, link, ytid, noerror) {
-  // TODO promise?
-  // Try to display images.
-  const media_wrapper = document.createElement('div')
-  media_wrapper.setAttribute('class', 'media_wrapper')
-  const linkElt = document.createElement('a')
-  linkElt.href = link
-  linkElt.style = 'text-decoration: none;'
-  const imageElt = document.createElement('img')
-  // Note, here, we don't check the size of the image.
-  // in the future, we can check the content-type and content-length with a request
-  // and maybe disable svg
-  if (noerror)
-    imageElt.setAttribute('onerror', 'this.style.display=\'none\'')
-  if (ytid) {
-    imageElt.src = `http://img.youtube.com/vi/${ytid}/0.jpg`
-  } else {
-    imageElt.src = link
-  }
-  linkElt.appendChild(imageElt)
-  if (ytid) {
-    const containerElt = document.createElement('div');
-    containerElt.setAttribute('class', 'containerVideo');
-    const playDiv = document.createElement('div')
-    playDiv.setAttribute('class', 'playVideo')
-    playDiv.innerHTML = '<svg fill="#ffffff" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">\
-        <path d="M8 5v14l11-7z"/>\
-        <path d="M0 0h24v24H0z" fill="none"/>\
-    </svg>'
-    linkElt.appendChild(playDiv)
-    containerElt.appendChild(linkElt)
-    media_wrapper.appendChild(containerElt)
-  } else {
-    media_wrapper.appendChild(linkElt)
-  }
-  return media_wrapper
+    /* TODO promise?
+     Try to display images. */
+    const media_wrapper = document.createElement("div")
+    media_wrapper.setAttribute("class", "media_wrapper")
+    const linkElt = document.createElement("a")
+    linkElt.href = link
+    linkElt.style = "text-decoration: none; border:none;"
+    const imageElt = document.createElement("img")
+    /* Note, here, we don't check the size of the image.
+     in the future, we can check the content-type and content-length with a request
+     and maybe disable svg */
+    if (noerror)
+        imageElt.setAttribute("onerror", "this.style.display='none'")
+    if (ytid) {
+        imageElt.src = `http://img.youtube.com/vi/${ytid}/0.jpg`
+    } else {
+        imageElt.src = link
+    }
+    linkElt.appendChild(imageElt)
+    if (ytid) {
+        const containerElt = document.createElement("div")
+        containerElt.setAttribute("class", "containerVideo")
+        const playDiv = document.createElement("div")
+        playDiv.setAttribute("class", "playVideo")
+        playDiv.innerHTML = "<svg fill=\"#ffffff\" viewBox=\"0 0 24 24\" xmlns=\"http://www.w3.org/2000/svg\">\
+        <path d=\"M8 5v14l11-7z\"/>\
+        <path d=\"M0 0h24v24H0z\" fill=\"none\"/>\
+    </svg>"
+        linkElt.appendChild(playDiv)
+        containerElt.appendChild(linkElt)
+        media_wrapper.appendChild(containerElt)
+    } else {
+        media_wrapper.appendChild(linkElt)
+    }
+    return media_wrapper
 }
 
 /**
@@ -729,14 +828,14 @@
  * @param htmlText the DOM to show
  */
 function textInteraction(message_id, htmlText) {
-  const message_wrapper = document.createElement('div')
-  message_wrapper.setAttribute('class', 'message_wrapper')
-  var message_text = document.createElement('span')
-  message_text.setAttribute('class', 'message_text')
-  message_text.innerHTML = htmlText
-  message_wrapper.appendChild(message_text)
-  // TODO STATUS
-  return message_wrapper
+    const message_wrapper = document.createElement("div")
+    message_wrapper.setAttribute("class", "message_wrapper")
+    var message_text = document.createElement("span")
+    message_text.setAttribute("class", "message_text")
+    message_text.innerHTML = htmlText
+    message_wrapper.appendChild(message_text)
+    // TODO STATUS
+    return message_wrapper
 }
 
 /**
@@ -746,69 +845,65 @@
  * @TODO retry button
  */
 function updateTextInteraction(message_div, delivery_status) {
-  if (!message_div.querySelector('.message_text')) return // media
-  switch(delivery_status)
-  {
+    if (!message_div.querySelector(".message_text")) return // media
+    var sending = message_div.querySelector(".sending")
+    switch(delivery_status)
+    {
     case "ongoing":
     case "sending":
-      var sending_div = message_div.querySelector('.sending')
-      if (!sending_div) {
-        sending_div = document.createElement('div')
-        sending_div.setAttribute('class', 'sending')
-        sending_div.innerHTML = '<svg overflow="hidden" viewBox="0 -2 16 14" height="16px" width="16px"><circle class="status_circle anim-first" cx="4" cy="12" r="1"/><circle class="status_circle anim-second" cx="8" cy="12" r="1"/><circle class="status_circle anim-third" cx="12" cy="12" r="1"/></svg>'
-        // add sending animation to message
-        message_div.appendChild(sending_div)
-      }
-      message_div.querySelector('.message_text').style = 'color: #888'
-      break
+        if (!sending) {
+            sending = document.createElement("div")
+            sending.setAttribute("class", "sending")
+            sending.innerHTML = "<svg overflow=\"hidden\" viewBox=\"0 -2 16 14\" height=\"16px\" width=\"16px\"><circle class=\"status_circle anim-first\" cx=\"4\" cy=\"12\" r=\"1\"/><circle class=\"status_circle anim-second\" cx=\"8\" cy=\"12\" r=\"1\"/><circle class=\"status_circle anim-third\" cx=\"12\" cy=\"12\" r=\"1\"/></svg>"
+            // add sending animation to message;
+            message_div.appendChild(sending)
+        }
+        message_div.querySelector(".message_text").style = "color: #888"
+        break
     case "failure":
-      // change text color to red
-      message_div.querySelector('.message_wrapper').style = 'background-color: #f3a6a6'
-      message_div.querySelector('.message_text').style = 'color: #000'
-      var failure_div = message_div.querySelector('.failure')
-      if (!failure_div) {
-        failure_div = document.createElement('div')
-        failure_div.setAttribute('class', 'failure')
-        failure_div.innerHTML = '<svg overflow="visible" viewBox="0 -2 16 14" height="16px" width="16px"><path class="status-x x-first" stroke="#AA0000" stroke-linecap="round" stroke-linejoin="round" stroke-width="3" fill="none" d="M4,4 L12,12"/><path class="status-x x-second" stroke="#AA0000" stroke-linecap="round" stroke-linejoin="round" stroke-width="3" fill="none" d="M12,4 L4,12"/></svg>'
-        // add failure animation to message
-        message_div.appendChild(failure_div)
-      }
-      var sending = message_div.querySelector('.sending')
-      if (sending) sending.style.visibility = 'hidden'
-      break
+        // change text color to red
+        message_div.querySelector(".message_wrapper").style = "background-color: #f3a6a6"
+        message_div.querySelector(".message_text").style = "color: #000"
+        var failure_div = message_div.querySelector(".failure")
+        if (!failure_div) {
+            failure_div = document.createElement("div")
+            failure_div.setAttribute("class", "failure")
+            failure_div.innerHTML = "<svg overflow=\"visible\" viewBox=\"0 -2 16 14\" height=\"16px\" width=\"16px\"><path class=\"status-x x-first\" stroke=\"#AA0000\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"3\" fill=\"none\" d=\"M4,4 L12,12\"/><path class=\"status-x x-second\" stroke=\"#AA0000\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"3\" fill=\"none\" d=\"M12,4 L4,12\"/></svg>"
+            // add failure animation to message
+            message_div.appendChild(failure_div)
+        }
+        if (sending) sending.style.display = "none"
+        break
     case "sent":
     case "finished":
     case "unknown":
     case "read":
-      // change text color to black
-      message_div.querySelector('.message_text').style = 'color: #000'
-      var sending = message_div.querySelector('.sending')
-      if (sending) sending.style.visibility = 'hidden'
-      break
+        // change text color to black
+        message_div.querySelector(".message_text").style = "color: #000"
+        if (sending) sending.style.display = "none"
+        break
     default:
-      console.log("getMessageDeliveryStatusText: unknown delivery status: " + delivery_status)
-      break
-  }
+        break
+    }
 }
 
 /**
  * Build a new interaction (call or contact)
- * @param message_id
  */
-function actionInteraction(message_id) {
-  var message_wrapper = document.createElement('div')
-  message_wrapper.setAttribute('class', 'message_wrapper')
+function actionInteraction() {
+    var message_wrapper = document.createElement("div")
+    message_wrapper.setAttribute("class", "message_wrapper")
 
-  // An file interaction contains buttons at the left of the interaction
-  // for the status or accept/refuse
-  var left_buttons = document.createElement('div')
-  left_buttons.setAttribute('class', 'left_buttons')
-  message_wrapper.appendChild(left_buttons)
-  // Also contains a bold clickable text
-  var text_div = document.createElement('div')
-  text_div.setAttribute('class', 'text')
-  message_wrapper.appendChild(text_div)
-  return message_wrapper
+    // An file interaction contains buttons at the left of the interaction
+    // for the status or accept/refuse
+    var left_buttons = document.createElement("div")
+    left_buttons.setAttribute("class", "left_buttons")
+    message_wrapper.appendChild(left_buttons)
+    // Also contains a bold clickable text
+    var text_div = document.createElement("div")
+    text_div.setAttribute("class", "text")
+    message_wrapper.appendChild(text_div)
+    return message_wrapper
 }
 
 /**
@@ -817,28 +912,28 @@
  * @param message_object new informations
  */
 function updateCallInteraction(message_div, message_object) {
-  const outgoingCall = '<svg fill="#219d55" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z" fill="none"/><path d="M9 5v2h6.59L4 18.59 5.41 20 17 8.41V15h2V5z"/></svg>'
-  const callMissed = '<svg fill="#dc2719" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z" fill="none"/><path d="M19.59 7L12 14.59 6.41 9H11V7H3v8h2v-4.59l7 7 9-9z"/></svg>'
-  const outgoingMissed = '<svg fill="#dc2719" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><defs><path d="M24 24H0V0h24v24z" id="a"/></defs><clipPath id="b"><use overflow="visible" xlink:href="#a"/></clipPath><path clip-path="url(#b)" d="M3 8.41l9 9 7-7V15h2V7h-8v2h4.59L12 14.59 4.41 7 3 8.41z"/></svg>'
-  const callReceived = '<svg fill="#219d55" height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg"><path d="M0 0h24v24H0z" fill="none"/><path d="M20 5.41L18.59 4 7 15.59V9H5v10h10v-2H8.41z"/></svg>'
+    const outgoingCall = "<svg fill=\"#219d55\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M0 0h24v24H0z\" fill=\"none\"/><path d=\"M9 5v2h6.59L4 18.59 5.41 20 17 8.41V15h2V5z\"/></svg>"
+    const callMissed = "<svg fill=\"#dc2719\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M0 0h24v24H0z\" fill=\"none\"/><path d=\"M19.59 7L12 14.59 6.41 9H11V7H3v8h2v-4.59l7 7 9-9z\"/></svg>"
+    const outgoingMissed = "<svg fill=\"#dc2719\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><defs><path d=\"M24 24H0V0h24v24z\" id=\"a\"/></defs><clipPath id=\"b\"><use overflow=\"visible\" xlink:href=\"#a\"/></clipPath><path clip-path=\"url(#b)\" d=\"M3 8.41l9 9 7-7V15h2V7h-8v2h4.59L12 14.59 4.41 7 3 8.41z\"/></svg>"
+    const callReceived = "<svg fill=\"#219d55\" height=\"24\" viewBox=\"0 0 24 24\" width=\"24\" xmlns=\"http://www.w3.org/2000/svg\"><path d=\"M0 0h24v24H0z\" fill=\"none\"/><path d=\"M20 5.41L18.59 4 7 15.59V9H5v10h10v-2H8.41z\"/></svg>"
 
-  const message_text = message_object['text']
-  const message_direction = (message_text.toLowerCase().indexOf('incoming') !== -1) ? 'in' : 'out'
-  const missed = message_text.indexOf('Missed') !== -1
+    const message_text = message_object["text"]
+    const message_direction = (message_text.toLowerCase().indexOf("incoming") !== -1) ? "in" : "out"
+    const missed = message_text.indexOf("Missed") !== -1
 
-  message_div.querySelector('.text').innerText = message_text.substring(2)
+    message_div.querySelector(".text").innerText = message_text.substring(2)
 
-  var left_buttons = message_div.querySelector('.left_buttons')
-  left_buttons.innerHTML = ''
-  var status_button = document.createElement('div')
-  var statusFile = ''
-  if (missed)
-    statusFile = (message_direction === 'in') ? callMissed : outgoingMissed
-  else
-    statusFile = (message_direction === 'in') ? callReceived : outgoingCall
-  status_button.innerHTML = statusFile
-  status_button.setAttribute('class', 'flat-button')
-  left_buttons.appendChild(status_button)
+    var left_buttons = message_div.querySelector(".left_buttons")
+    left_buttons.innerHTML = ""
+    var status_button = document.createElement("div")
+    var statusFile = ""
+    if (missed)
+        statusFile = (message_direction === "in") ? callMissed : outgoingMissed
+    else
+        statusFile = (message_direction === "in") ? callReceived : outgoingCall
+    status_button.innerHTML = statusFile
+    status_button.setAttribute("class", "flat-button")
+    left_buttons.appendChild(status_button)
 }
 
 /**
@@ -847,18 +942,18 @@
  * @param message_object new informations
  */
 function updateContactInteraction(message_div, message_object) {
-  const message_text = message_object['text']
+    const message_text = message_object["text"]
 
-  message_div.querySelector('.text').innerText = message_text
+    message_div.querySelector(".text").innerText = message_text
 
-  var left_buttons = message_div.querySelector('.left_buttons')
-  left_buttons.innerHTML = ''
-  var status_button = document.createElement('div')
-  status_button.innerHTML = '<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24">\
-<path d="M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z"/>\
-<path d="M0 0h24v24H0z" fill="none"/></svg>'
-  status_button.setAttribute('class', 'flat-button')
-  left_buttons.appendChild(status_button)
+    var left_buttons = message_div.querySelector(".left_buttons")
+    left_buttons.innerHTML = ""
+    var status_button = document.createElement("div")
+    status_button.innerHTML = "<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"24\" height=\"24\" viewBox=\"0 0 24 24\">\
+<path d=\"M12 12c2.21 0 4-1.79 4-4s-1.79-4-4-4-4 1.79-4 4 1.79 4 4 4zm0 2c-2.67 0-8 1.34-8 4v2h16v-2c0-2.66-5.33-4-8-4z\"/>\
+<path d=\"M0 0h24v24H0z\" fill=\"none\"/></svg>"
+    status_button.setAttribute("class", "flat-button")
+    left_buttons.appendChild(status_button)
 }
 
 /**
@@ -868,218 +963,219 @@
  * @param insert_after if we want the message at the end or the top of the conversation
  */
 function addOrUpdateMessage(message_object, new_message, insert_after = true) {
-  const message_id = message_object['id']
-  const message_type = message_object['type']
-  const message_text = message_object['text']
-  const message_direction = message_object['direction']
-  const message_timestamp = message_object['timestamp']
-  const delivery_status = message_object['delivery_status']
-  const message_sender_contact_method = message_object['sender_contact_method']
+    const message_id = message_object["id"]
+    const message_type = message_object["type"]
+    const message_text = message_object["text"]
+    const message_direction = message_object["direction"]
+    const message_timestamp = message_object["timestamp"]
+    const delivery_status = message_object["delivery_status"]
+    const message_sender_contact_method = message_object["sender_contact_method"]
 
-  var message_div = document.querySelector('#message_' + message_id);
-  var type = ''
-  if (new_message) {
+    var message_div = document.getElementById("message_" + message_id)
+    var type = ""
+    if (new_message) {
     // Build new message
-    var classes = [
-        'message',
-        `message_${message_direction}`,
-        `message_type_${message_type}`
-    ]
+        var classes = [
+            "message",
+            `message_${message_direction}`,
+            `message_type_${message_type}`
+        ]
 
-    message_div = document.createElement('div')
-    message_div.setAttribute('id', `message_${message_id}`)
-    message_div.setAttribute('class', classes.join(' '))
+        message_div = document.createElement("div")
+        message_div.setAttribute("id", `message_${message_id}`)
+        message_div.setAttribute("class", classes.join(" "))
 
-    // Build message for each types.
-    // Add sender images if necessary (like if the interaction doesn't take the whole width)
-    const need_sender = (message_type === 'data_transfer' || message_type === 'text');
-    if (need_sender) {
-      var message_sender_image = document.createElement('span')
-      message_sender_image.setAttribute('class', `sender_image sender_image_${message_sender_contact_method}`)
-      message_div.appendChild(message_sender_image)
-    }
-
-    // Build main content
-    if (message_type === 'data_transfer') {
-      if (isImage(message_text) && delivery_status === 'finished' && displayLinksEnabled) {
-        message_div.append(mediaInteraction(message_id, message_text, null, false))
-        message_div.querySelector('img').id = message_id
-        message_div.querySelector('img').msg_obj = message_object
-        message_div.querySelector('img').onerror = function() {
-          message_div = document.getElementById('#message_' + this.id);
-          if (message_div.querySelector('.message_wrapper')) {
-            wrapper = message_div.querySelector('.message_wrapper')
-            wrapper.parentNode.removeChild(wrapper)
-          }
-          message_div.append(fileInteraction(message_id))
-          updateFileInteraction(message_div, this.msg_obj, true)
+        // Build message for each types.
+        // Add sender images if necessary (like if the interaction doesn't take the whole width)
+        const need_sender = (message_type === "data_transfer" || message_type === "text")
+        if (need_sender) {
+            var message_sender_image = document.createElement("span")
+            message_sender_image.setAttribute("class", `sender_image sender_image_${message_sender_contact_method}`)
+            message_div.appendChild(message_sender_image)
         }
-      } else {
-        message_div.append(fileInteraction(message_id))
-      }
-    } else if (message_type === 'text') {
-      // TODO add the possibility to update messages (remove and rebuild)
-      const htmlText = getMessageHtml(message_text)
-      if (displayLinksEnabled) {
-        const parser = new DOMParser();
-        const DOMMsg = parser.parseFromString(htmlText, 'text/xml');
-        const links = DOMMsg.querySelectorAll('a');
-        if (DOMMsg.childNodes.length && links.length) {
-          var isTextToShow = (DOMMsg.childNodes[0].childNodes.length > 1)
-          const ytid = (isVideo(message_text))? youtube_id(message_text) : ''
-          if (!isTextToShow && (ytid || isImage(message_text))) {
-            type = 'media'
-            message_div.append(mediaInteraction(message_id, message_text, ytid))
-          }
+
+        // Build main content
+        if (message_type === "data_transfer") {
+            if (isImage(message_text) && delivery_status === "finished" && displayLinksEnabled) {
+                message_div.append(mediaInteraction(message_id, message_text, null, false))
+                message_div.querySelector("img").id = message_id
+                message_div.querySelector("img").msg_obj = message_object
+                message_div.querySelector("img").onerror = function() {
+                    message_div = document.getElementById("#message_" + this.id)
+                    /* FIXME in many cases, message_div is null here and this code doesn't do anything */
+                    if (message_div.querySelector(".message_wrapper")) {
+                        var wrapper = message_div.querySelector(".message_wrapper")
+                        wrapper.parentNode.removeChild(wrapper)
+                    }
+                    message_div.append(fileInteraction(message_id))
+                    updateFileInteraction(message_div, this.msg_obj, true)
+                }
+            } else {
+                message_div.append(fileInteraction(message_id))
+            }
+        } else if (message_type === "text") {
+            // TODO add the possibility to update messages (remove and rebuild)
+            const htmlText = getMessageHtml(message_text)
+            if (displayLinksEnabled) {
+                const parser = new DOMParser()
+                const DOMMsg = parser.parseFromString(htmlText, "text/xml")
+                const links = DOMMsg.querySelectorAll("a")
+                if (DOMMsg.childNodes.length && links.length) {
+                    var isTextToShow = (DOMMsg.childNodes[0].childNodes.length > 1)
+                    const ytid = (isVideo(message_text))? youtube_id(message_text) : ""
+                    if (!isTextToShow && (ytid || isImage(message_text))) {
+                        type = "media"
+                        message_div.append(mediaInteraction(message_id, message_text, ytid))
+                    }
+                }
+            }
+            if (type !== "media") {
+                type = "text"
+                message_div.append(textInteraction(message_id, htmlText))
+            }
+        } else if (message_type === "call" || message_type === "contact") {
+            message_div.append(actionInteraction())
+        } else {
+            const temp = document.createElement("div")
+            temp.innerText = message_type
+            message_div.appendChild(temp)
         }
-      }
-      if (type !== 'media') {
-        type = 'text'
-        message_div.append(textInteraction(message_id, htmlText))
-      }
-    } else if (message_type === 'call' || message_type === 'contact') {
-      message_div.append(actionInteraction(message_id))
-    } else {
-      const temp = document.createElement('div')
-      temp.innerText = message_type
-      message_div.appendChild(temp)
+
+        // Get timestamp to add
+        const formattedTimestamp = getMessageTimestampText(message_timestamp, true)
+        // Create the timestamp object
+        const date_elt = document.createElement("div")
+        date_elt.innerText = formattedTimestamp
+        var typeIsCallOrContact = (message_type === "call" || message_type === "contact")
+        var timestamp_div_classes = ["timestamp", typeIsCallOrContact ? "timestamp_action" : `timestamp_${message_direction}`]
+        date_elt.setAttribute("class", timestamp_div_classes.join(" "))
+        date_elt.setAttribute("message_timestamp", message_timestamp)
+
+        // Remove last timestamp if it's the same<h6></h6>
+        if (messages.getElementsByClassName(".timestamp"))
+            cleanPreviousTimestamps(date_elt, messages.children.length)
+
+        // Add message and the new timestamp
+        if (insert_after) {
+            if (message_type === "call" || message_type === "contact") {
+                message_div.querySelector(".message_wrapper").appendChild(date_elt)
+                messages.appendChild(message_div)
+            } else {
+                messages.appendChild(message_div)
+                messages.appendChild(date_elt)
+            }
+        } else {
+            if (message_type === "call" || message_type === "contact") {
+                message_div.querySelector(".message_wrapper").appendChild(date_elt)
+                messages.insertBefore(message_div, messages.firstChild)
+            } else {
+                messages.insertBefore(date_elt, messages.firstChild)
+                messages.insertBefore(message_div, messages.firstChild)
+            }
+        }
     }
 
-    // Get timestamp to add
-    const formattedTimestamp = getMessageTimestampText(message_timestamp, true)
-    // Create the timestamp object
-    const date_elt = document.createElement('div')
-    date_elt.innerText = formattedTimestamp
-    if (message_type === 'call' || message_type === 'contact') {
-      timestamp_div_classes = [
-        'timestamp',
-        `timestamp_action`
-      ]
-    } else {
-      timestamp_div_classes = [
-        'timestamp',
-        `timestamp_${message_direction}`
-      ]
-    }
-    date_elt.setAttribute('class', timestamp_div_classes.join(' '))
-    date_elt.setAttribute('message_timestamp', message_timestamp)
-    // Remove last timestamp if it's the same<h6></h6>
-    if (messages.querySelectorAll('.timestamp'))
-        cleanPreviousTimestamps(date_elt, messages.children.length)
-
-    // Add message and the new timestamp
-    if (insert_after) {
-      if (message_type === 'call' || message_type === 'contact') {
-        message_div.querySelector('.message_wrapper').appendChild(date_elt)
-        messages.appendChild(message_div)
-      } else {
-        messages.appendChild(message_div)
-        messages.appendChild(date_elt)
-      }
-    } else {
-      if (message_type === 'call' || message_type === 'contact') {
-        message_div.querySelector('.message_wrapper').appendChild(date_elt)
-        messages.insertBefore(message_div, messages.firstChild)
-      } else {
-        messages.insertBefore(date_elt, messages.firstChild)
-        messages.insertBefore(message_div, messages.firstChild)
-      }
-    }
-  }
-
-  // Update informations if needed
-  if (message_type === 'data_transfer')
-    updateFileInteraction(message_div, message_object)
-  if (message_type === 'text' && message_direction === 'out')
+    // Update informations if needed
+    if (message_type === "data_transfer")
+        updateFileInteraction(message_div, message_object)
+    if (message_type === "text" && message_direction === "out")
     // Modify sent status if necessary
-    updateTextInteraction(message_div, delivery_status)
-  if (message_type === 'call')
-    updateCallInteraction(message_div, message_object)
-  if (message_type === 'contact')
-    updateContactInteraction(message_div, message_object)
+        updateTextInteraction(message_div, delivery_status)
+    if (message_type === "call")
+        updateCallInteraction(message_div, message_object)
+    if (message_type === "contact")
+        updateContactInteraction(message_div, message_object)
 
-  // Clean timestamps
-  updateTimestamps();
+    // Clean timestamps
+    updateTimestamps()
 }
 
-
 /**
- * Add a message to the buffer
+ * Add a message to the buffer.
+ *
+ * @param message_object message to be added
  */
+/* exported addMessage */
 function addMessage(message_object)
 {
-    var atEnd = messages.scrollTop >= messages.scrollHeight - messages.clientHeight - 5;
-    addOrUpdateMessage(message_object, true);
+    var atEnd = messages.scrollTop >= messages.scrollHeight - messages.clientHeight - 5
+    addOrUpdateMessage(message_object, true)
     if (atEnd) {
         var startTime = Date.now(),
             durTime = 250.,
             scrollStartHeight = messages.scrollHeight,
             scrollStart = messages.scrollTop,
-            scrollDiff = scrollStartHeight - messages.clientHeight - scrollStart;
-
+            scrollDiff = scrollStartHeight - messages.clientHeight - scrollStart
         function loop() {
             var time = Date.now() - startTime,
                 scrollHeight = messages.scrollHeight,
-                diff = messages.scrollTop - scrollStart; // If user scrolls up (diff > 0).
+                diff = messages.scrollTop - scrollStart // If user scrolls up (diff > 0).
 
             if (time >= durTime || scrollHeight != scrollStartHeight || diff < 0) {
                 if (diff >= 0) { // User scrolled up, don't autoscroll.
-                    messages.scrollTop = scrollHeight;
+                    messages.scrollTop = scrollHeight
                 }
-                return false;
+                return false
             } else {
-                messages.scrollTop = scrollStart + (scrollDiff * (time/durTime));
-                raf(loop);
+                messages.scrollTop = scrollStart + (scrollDiff * (time/durTime))
+                raf(loop)
             }
         }
-        raf(loop); // Start the animation loop
+
+
+        raf(loop) // Start the animation loop
     }
 }
 
 /**
  * Show the history in reverse order
  */
-function printHistoryPart () {
-  if(historyBuffer.length == 0) {
-      // nothing to print
-      return;
-  }
+function printHistoryPart() {
+    if(historyBuffer.length == 0 || historyBufferIndex === historyBuffer.length) {
+        // nothing to print
+        return
+    }
 
-  var previousScrollHeightMinusTop = messages.scrollHeight - messages.scrollTop;
+    var previousScrollHeightMinusTop = messages.scrollHeight - messages.scrollTop
 
-  // Show 10 messages
-  for (var i = 0; i < 10; ++i) {
-    addOrUpdateMessage(historyBuffer[historyBuffer.length - 1 - historyBufferIndex], true, false);
-    historyBufferIndex ++;
-    if (historyBufferIndex === historyBuffer.length)
-      break;
-  }
+    // Show 10 messages
+    for (var i = 0; i < 10; ++i) {
+        addOrUpdateMessage(historyBuffer[historyBuffer.length - 1 - historyBufferIndex], true, false)
+        historyBufferIndex ++
 
-  // Replace the scrollbar to the wanted position
-  messages.scrollTop = messages.scrollHeight - previousScrollHeightMinusTop;
+        if (historyBufferIndex === historyBuffer.length)
+            break
+    }
 
-  // Make a short pause to minimize ressources consumption
-  // show quickly the first hundred messages
-  if (historyBufferIndex !== historyBuffer.length)
-    setTimeout(printHistoryPart, (historyBufferIndex > 100) ? 100 : 1);
+    // Replace the scrollbar to the wanted position
+    messages.scrollTop = messages.scrollHeight - previousScrollHeightMinusTop
+
+    // Make a short pause to minimize ressources consumption
+    // show quickly the first hundred messages
+    if (historyBufferIndex !== historyBuffer.length)
+        setTimeout(printHistoryPart, (historyBufferIndex > 100) ? 100 : 1)
 }
 
 /**
  * Show the whole history in the chatview.
+ * @param messages_array array containing history to be printed
  */
+/* exported printHistory */
 function printHistory(messages_array)
 {
-    historyBuffer = messages_array;
-    historyBufferIndex = 0;
-    setTimeout(printHistoryPart, 0);
+    historyBuffer = messages_array
+    historyBufferIndex = 0
+    setTimeout(printHistoryPart, 0)
 }
 
 /**
- * Updated a message that was previously added with addMessage
+ * Update a message that was previously added with addMessage
+ * @param message_object message to be updated
  */
+/* exported updateMessage */
 function updateMessage(message_object)
 {
-    addOrUpdateMessage(message_object, false);
+    addOrUpdateMessage(message_object, false)
 }
 
 /**
@@ -1087,42 +1183,41 @@
  * set_sender_image object should contain the following keys:
  * - sender: the name of the sender
  * - sender_image: base64 png encoding of the sender image
+ *
+ * @param set_sender_image_object sender image object as previously described
  */
+/* exported setSenderImage */
 function setSenderImage(set_sender_image_object)
 {
-    var sender_contact_method = set_sender_image_object['sender_contact_method'],
-        sender_image = set_sender_image_object['sender_image'],
+    var sender_contact_method = set_sender_image_object["sender_contact_method"],
+        sender_image = set_sender_image_object["sender_image"],
         sender_image_id = "sender_image_" + sender_contact_method,
         currentSenderImage = document.getElementById("#" + sender_image_id), // Remove the currently set sender image
-        style;
+        style
 
     if (currentSenderImage) {
-        currentSenderImage.parentNode.removeChild(currentSenderImage);
+        currentSenderImage.parentNode.removeChild(currentSenderImage)
     }
 
     // Create a new style element
-    style = document.createElement('style');
+    style = document.createElement("style")
 
-    style.type = 'text/css';
-    style.id = sender_image_id;
-    style.innerHTML = '.' + sender_image_id + " {content: url(data:image/png;base64," + sender_image + ");height: 35px;width: 35px;}";
-    document.head.appendChild(style);
+    style.type = "text/css"
+    style.id = sender_image_id
+    style.innerHTML = "." + sender_image_id + " {content: url(data:image/png;base64," + sender_image + ");height: 35px;width: 35px;}"
+    document.head.appendChild(style)
 }
 
+/* exported clearSenderImages */
 function clearSenderImages()
 {
     var styles = document.head.querySelectorAll("style"),
-    i = styles.length;
+        i = styles.length
 
     while (i--){
-      document.head.removeChild(styles[i]);
+        document.head.removeChild(styles[i])
     }
 }
 
-function sendFile()
-{
-  window.prompt('SEND_FILE');
-}
-
 </script>
 </html>