From 099f99a96b8ac3684abbf8e34f2ff41a703accda Mon Sep 17 00:00:00 2001
From: Bruno Windels <bruno@windels.cloud>
Date: Thu, 17 Jun 2021 09:41:25 +0200
Subject: [PATCH] check power levels to see if we can react

---
 .../room/timeline/tiles/BaseMessageTile.js    |  3 +-
 src/matrix/room/timeline/PowerLevels.js       | 61 +++++++++++++++++--
 .../session/room/timeline/BaseMessageView.js  |  5 +-
 3 files changed, 61 insertions(+), 8 deletions(-)

diff --git a/src/domain/session/room/timeline/tiles/BaseMessageTile.js b/src/domain/session/room/timeline/tiles/BaseMessageTile.js
index 3c20f7f7..b73e1c26 100644
--- a/src/domain/session/room/timeline/tiles/BaseMessageTile.js
+++ b/src/domain/session/room/timeline/tiles/BaseMessageTile.js
@@ -119,8 +119,7 @@ export class BaseMessageTile extends SimpleTile {
     }
 
     get canReact() {
-        // TODO
-        return true;
+        return this._powerLevels.canSendType("m.reaction");
     }
 
     react(key, log = null) {
diff --git a/src/matrix/room/timeline/PowerLevels.js b/src/matrix/room/timeline/PowerLevels.js
index 87be562f..9161c8ed 100644
--- a/src/matrix/room/timeline/PowerLevels.js
+++ b/src/matrix/room/timeline/PowerLevels.js
@@ -29,8 +29,16 @@ export class PowerLevels {
         }
     }
 
+    canSendType(eventType) {
+        return this._myLevel >= this._getEventTypeLevel(eventType);
+    }
+
     get canRedact() {
-        return this._getUserLevel(this._ownUserId) >= this._getActionLevel("redact");
+        return this._myLevel >= this._getActionLevel("redact");
+    }
+
+    get _myLevel() {
+        return this._getUserLevel(this._ownUserId);
     }
 
     _getUserLevel(userId) {
@@ -59,25 +67,51 @@ export class PowerLevels {
             return 50;
         }
     }
+
+    _getEventTypeLevel(eventType) {
+        const level = this._plEvent?.content.events?.[eventType];
+        if (typeof level === "number") {
+            return level;
+        } else {
+            const level = this._plEvent?.content.events_default;
+            if (typeof level === "number") {
+                return level;
+            } else {
+                return 0;
+            }
+        }
+    }
 }
 
 export function tests() {
     const alice = "@alice:hs.tld";
     const bob = "@bob:hs.tld";
+    const charly = "@charly:hs.tld";
     const createEvent = {content: {creator: alice}};
-    const powerLevelEvent = {content: {
+    const redactPowerLevelEvent = {content: {
         redact: 50,
         users: {
             [alice]: 50
         },
         users_default: 0
     }};
+    const eventsPowerLevelEvent = {content: {
+        events_default: 5,
+        events: {
+            "m.room.message": 45
+        },
+        users: {
+            [alice]: 50,
+            [bob]: 10
+        },
+        users_default: 0
+    }};
 
     return {
         "redact somebody else event with power level event": assert => {
-            const pl1 = new PowerLevels({powerLevelEvent, ownUserId: alice});
+            const pl1 = new PowerLevels({powerLevelEvent: redactPowerLevelEvent, ownUserId: alice});
             assert.equal(pl1.canRedact, true);
-            const pl2 = new PowerLevels({powerLevelEvent, ownUserId: bob});
+            const pl2 = new PowerLevels({powerLevelEvent: redactPowerLevelEvent, ownUserId: bob});
             assert.equal(pl2.canRedact, false);
         },
         "redact somebody else event with create event": assert => {
@@ -91,5 +125,22 @@ export function tests() {
             assert.equal(pl.canRedactFromSender(alice), true);
             assert.equal(pl.canRedactFromSender(bob), false);
         },
+        "can send event without power levels": assert => {
+            const pl = new PowerLevels({createEvent, ownUserId: charly});
+            assert.equal(pl.canSendType("m.room.message"), true);
+        },
+        "can't send any event below events_default": assert => {
+            const pl = new PowerLevels({powerLevelEvent: eventsPowerLevelEvent, ownUserId: charly});
+            assert.equal(pl.canSendType("m.foo"), false);
+        },
+        "can't send event below events[type]": assert => {
+            const pl = new PowerLevels({powerLevelEvent: eventsPowerLevelEvent, ownUserId: bob});
+            assert.equal(pl.canSendType("m.foo"), true);
+            assert.equal(pl.canSendType("m.room.message"), false);
+        },
+        "can send event below events[type]": assert => {
+            const pl = new PowerLevels({powerLevelEvent: eventsPowerLevelEvent, ownUserId: alice});
+            assert.equal(pl.canSendType("m.room.message"), true);
+        },
     }
-}
\ No newline at end of file
+}
diff --git a/src/platform/web/ui/session/room/timeline/BaseMessageView.js b/src/platform/web/ui/session/room/timeline/BaseMessageView.js
index 9afd7609..8c98a3a2 100644
--- a/src/platform/web/ui/session/room/timeline/BaseMessageView.js
+++ b/src/platform/web/ui/session/room/timeline/BaseMessageView.js
@@ -110,12 +110,15 @@ export class BaseMessageView extends TemplateView {
 
     createMenuOptions(vm) {
         const options = [];
+        if (vm.canReact) {
+            options.push(Menu.option(vm.i18n`React with 👍`, () => vm.react("👍")))
+            options.push(Menu.option(vm.i18n`React with 🙈`, () => vm.react("🙈")))
+        }
         if (vm.canAbortSending) {
             options.push(Menu.option(vm.i18n`Cancel`, () => vm.abortSending()));
         } else if (vm.canRedact) {
             options.push(Menu.option(vm.i18n`Delete`, () => vm.redact()).setDestructive());
         }
-        options.push(Menu.option(vm.i18n`React with 👍`, () => vm.react("👍")))
         return options;
     }