From 0c90cde8f3a3b2e94cf7c6e00b80783dfed33244 Mon Sep 17 00:00:00 2001
From: Bob Mottram <bob@freedombone.net>
Date: Wed, 5 Aug 2020 13:47:15 +0100
Subject: [PATCH] Local decrypt dummy function

---
 devices.py      | 29 +++++++++++++++++++++++++++++
 webinterface.py |  6 ++++++
 2 files changed, 35 insertions(+)

diff --git a/devices.py b/devices.py
index 607b6ee3..9fd97b45 100644
--- a/devices.py
+++ b/devices.py
@@ -37,3 +37,32 @@ def devicesCollection(baseDir: str, nickname: str, domain: str,
         'items': deviceList
     }
     return devicesDict
+
+
+def decryptMessageFromDevice(messageJson: {}) -> str:
+    """Locally decrypts a message on the device.
+    This should probably be a link to a local script
+    or native app, such that what the user sees isn't
+    something which the server could get access to.
+    """
+    # TODO
+    #  {
+    #    "type": "EncryptedMessage",
+    #    "messageType": 0,
+    #    "cipherText": "...",
+    #    "digest": {
+    #      "type": "Digest",
+    #      "digestAlgorithm": "http://www.w3.org/2000/09/xmldsig#hmac-sha256",
+    #      "digestValue": "5f6ad31acd64995483d75c7..."
+    #    },
+    #    "messageFranking": "...",
+    #    "attributedTo": {
+    #      "type": "Device",
+    #      "deviceId": "11119"
+    #    },
+    #    "to": {
+    #      "type": "Device",
+    #      "deviceId": "11876"
+    #    }
+    #  }
+    return ''
diff --git a/webinterface.py b/webinterface.py
index aade59c8..45df3d27 100644
--- a/webinterface.py
+++ b/webinterface.py
@@ -78,6 +78,7 @@ from git import isGitPatch
 from theme import getThemesList
 from petnames import getPetName
 from followingCalendar import receivingCalendarEvents
+from devices import decryptMessageFromDevice
 
 
 def getAltPath(actor: str, domainFull: str, callingDomain: str) -> str:
@@ -4248,8 +4249,13 @@ def individualPostAsHtml(recentPostsCache: {}, maxRecentPosts: int,
     if not postJsonObject['object'].get('summary'):
         postJsonObject['object']['summary'] = ''
 
+    if postJsonObject['object'].get('cipherText'):
+        postJsonObject['object']['content'] = \
+            decryptMessageFromDevice(postJsonObject['object'])
+
     if not postJsonObject['object'].get('content'):
         return ''
+
     isPatch = isGitPatch(baseDir, nickname, domain,
                          postJsonObject['object']['type'],
                          postJsonObject['object']['summary'],