channel: add reactions blueprint

SQL for instances:
```sql
DROP TABLE message_reactions;
```
Then rerun `schema.sql`.

litecord/blueprints/channel/messages.py

@@ -16,6 +16,18 @@ log = Logger(__name__)
 bp = Blueprint('channel_messages', __name__)
 
 
+def extract_limit(request, default: int = 50):
+    try:
+        limit = int(request.args.get('limit', 50))
+
+        if limit not in range(0, 100):
+            raise ValueError()
+    except (TypeError, ValueError):
+        raise BadRequest('limit not int')
+
+    return limit
+
+
 def query_tuple_from_args(args: dict, limit: int) -> tuple:
     before, after = None, None
 
@@ -41,13 +53,7 @@ async def get_messages(channel_id):
     # TODO: check READ_MESSAGE_HISTORY permission
     await channel_check(user_id, channel_id)
 
-    try:
-        limit = int(request.args.get('limit', 50))
-
-        if limit not in range(0, 100):
-            raise ValueError()
-    except (TypeError, ValueError):
-        raise BadRequest('limit not int')
+    limit = extract_limit(request, 50)
 
     where_clause = ''
     before, after = query_tuple_from_args(request.args, limit)

litecord/blueprints/channel/reactions.py

@@ -0,0 +1,224 @@
+from enum import IntEnum
+
+from quart import Blueprint, request, current_app as app, jsonify
+from logbook import Logger
+
+
+from litecord.utils import async_map
+from litecord.blueprints.auth import token_check
+from litecord.blueprints.checks import channel_check
+from litecord.blueprints.channel.messages import (
+    query_tuple_from_args, extract_limit
+)
+
+from litecord.errors import MessageNotFound, Forbidden, BadRequest
+from litecord.enums import GUILD_CHANS
+
+
+log = Logger(__name__)
+bp = Blueprint('channel_reactions', __name__)
+
+BASEPATH = '/<int:channel_id>/messages/<int:message_id>/reactions'
+
+
+class EmojiType(IntEnum):
+    CUSTOM = 0
+    UNICODE = 1
+
+
+def emoji_info_from_str(emoji: str) -> tuple:
+    """Extract emoji information from an emoji string
+    given on the reaction endpoints."""
+    # custom emoji have an emoji of name:id
+    # unicode emoji just have the raw unicode.
+
+    # try checking if the emoji is custom or unicode
+    emoji_type = 0 if ':' in emoji else 1
+    emoji_type = EmojiType(emoji_type)
+
+    # extract the emoji id OR the unicode value of the emoji
+    # depending if it is custom or not
+    emoji_id = (int(emoji.split(':')[1])
+                if emoji_type == EmojiType.CUSTOM
+                else emoji)
+
+    emoji_name = emoji.split(':')[0]
+
+    return emoji_type, emoji_id, emoji_name
+
+
+def _partial_emoji(emoji_type, emoji_id, emoji_name) -> dict:
+    return {
+        'id': None if emoji_type.UNICODE else emoji_id,
+        'name': emoji_id if emoji_type.UNICODE else emoji_name
+    }
+
+
+def _make_payload(user_id, channel_id, message_id, partial):
+    return {
+        'user_id': str(user_id),
+        'channel_id': str(channel_id),
+        'message_id': str(message_id),
+        'emoji': partial
+    }
+
+
+@bp.route(f'{BASEPATH}/<emoji>/@me', methods=['PUT'])
+async def add_reaction(channel_id: int, message_id: int, emoji: str):
+    """Put a reaction."""
+    user_id = await token_check()
+
+    # TODO: check READ_MESSAGE_HISTORY permission
+    #       and ADD_REACTIONS. look on route docs.
+    ctype, guild_id = await channel_check(user_id, channel_id)
+
+    emoji_type, emoji_id, emoji_name = emoji_info_from_str(emoji)
+
+    await app.db.execute(
+        """
+        INSERT INTO message_reactions (message_id, user_id,
+            emoji_type, emoji_id, emoji_text)
+        VALUES ($1, $2, $3, $4, $5)
+        """, message_id, user_id, emoji_type,
+
+        # if it is custom, we put the emoji_id on emoji_id
+        # column, if it isn't, we put it on emoji_text
+        # column.
+        emoji_id if emoji_type == EmojiType.CUSTOM else None,
+        emoji_id if emoji_type == EmojiType.UNICODE else None
+    )
+
+    partial = _partial_emoji(emoji_type, emoji_id, emoji_name)
+    payload = _make_payload(user_id, channel_id, message_id, partial)
+
+    if ctype in GUILD_CHANS:
+        payload['guild_id'] = str(guild_id)
+
+    await app.dispatcher.dispatch(
+        'channel', channel_id, 'MESSAGE_REACTION_ADD', payload)
+
+    return '', 204
+
+
+def _emoji_sql(emoji_type, emoji_id, emoji_name, param=4):
+    """Extract SQL clauses to search for specific emoji
+    in the message_reactions table."""
+    param = f'${param}'
+
+    # know which column to filter with
+    where_ext = (f'AND emoji_id = {param}'
+                 if emoji_type == EmojiType.CUSTOM else
+                 f'AND emoji_text = {param}')
+
+    # which emoji to remove (custom or unicode)
+    main_emoji = emoji_id if emoji_type == EmojiType.CUSTOM else emoji_name
+
+    return where_ext, main_emoji
+
+
+def _emoji_sql_simple(emoji: str, param=4):
+    """Simpler version of _emoji_sql for functions that
+    don't need the results from emoji_info_from_str."""
+    emoji_type, emoji_id, emoji_name = emoji_info_from_str(emoji)
+    return _emoji_sql(emoji_type, emoji_id, emoji_name, param)
+
+
+async def remove_reaction(channel_id: int, message_id: int,
+                          user_id: int, emoji: str):
+    ctype, guild_id = await channel_check(user_id, channel_id)
+
+    emoji_type, emoji_id, emoji_name = emoji_info_from_str(emoji)
+    where_ext, main_emoji = _emoji_sql(emoji_type, emoji_id, emoji_name)
+
+    await app.db.execute(
+        f"""
+        DELETE FROM message_reactions
+        WHERE message_id = $1
+          AND user_id = $2
+          AND emoji_type = $3
+          {where_ext}
+        """, message_id, user_id, emoji_type, main_emoji)
+
+    partial = _partial_emoji(emoji_type, emoji_id, emoji_name)
+    payload = _make_payload(user_id, channel_id, message_id, partial)
+
+    if ctype in GUILD_CHANS:
+        payload['guild_id'] = str(guild_id)
+
+    await app.dispatcher.dispatch(
+        'channel', channel_id, 'MESSAGE_REACTION_REMOVE', payload)
+
+
+@bp.route(f'{BASEPATH}/<emoji>/@me', methods=['DELETE'])
+async def remove_own_reaction(channel_id, message_id, emoji):
+    """Remove a reaction."""
+    user_id = await token_check()
+
+    await remove_reaction(channel_id, message_id, user_id, emoji)
+
+    return '', 204
+
+
+@bp.route(f'{BASEPATH}/<emoji>/<int:other_id>', methods=['DELETE'])
+async def remove_user_reaction(channel_id, message_id, emoji, other_id):
+    """Remove a reaction made by another user."""
+    await token_check()
+
+    # TODO: check MANAGE_MESSAGES permission (and use user_id
+    # from token_check to do it)
+    await remove_reaction(channel_id, message_id, other_id, emoji)
+
+    return '', 204
+
+
+@bp.route(f'{BASEPATH}/<emoji>', methods=['GET'])
+async def list_users_reaction(channel_id, message_id, emoji):
+    """Get the list of all users who reacted with a certain emoji."""
+    user_id = await token_check()
+
+    # this is not using either ctype or guild_id
+    # that are returned by channel_check
+    await channel_check(user_id, channel_id)
+
+    limit = extract_limit(request, 25)
+    before, after = query_tuple_from_args(request.args, limit)
+
+    before_clause = 'AND user_id < $2' if before else ''
+    after_clause = 'AND user_id > $3' if after else ''
+
+    where_ext, main_emoji = _emoji_sql_simple(emoji, 4)
+
+    rows = await app.db.fetch(f"""
+    SELECT user_id
+    FROM message_reactions
+    WHERE message_id = $1 {before_clause} {after_clause} {where_ext}
+    """, message_id, before, after, main_emoji)
+
+    user_ids = [r['user_id'] for r in rows]
+    users = await async_map(app.storage.get_user, user_ids)
+    return jsonify(users)
+
+
+@bp.route(f'{BASEPATH}', methods=['DELETE'])
+async def remove_all_reactions(channel_id, message_id):
+    """Remove all reactions in a message."""
+    user_id = await token_check()
+
+    # TODO: check MANAGE_MESSAGES permission
+    ctype, guild_id = await channel_check(user_id, channel_id)
+
+    await app.db.execute("""
+    DELETE FROM message_reactions
+    WHERE message_id = $1
+    """, message_id)
+
+    payload = {
+        'channel_id': str(channel_id),
+        'message_id': str(message_id),
+    }
+
+    if ctype in GUILD_CHANS:
+        payload['guild_id'] = str(guild_id)
+
+    await app.dispatcher.dispatch(
+        'channel', channel_id, 'MESSAGE_REACTION_REMOVE_ALL', payload)

nginx.conf

@@ -5,13 +5,11 @@ server {
     location / {
         proxy_pass http://localhost:5000;
     }
-}
 
-# Main litecord websocket proxy.
-server {
-    server_name websocket.somewhere;
-
-    location / {
+    # if you don't want to keep the gateway
+    # domain as the main domain, you can
+    # keep a separate server block
+    location /ws {
         proxy_pass http://localhost:5001;
 
         # those options are required for websockets

schema.sql

@@ -528,9 +528,12 @@ CREATE TABLE IF NOT EXISTS message_reactions (
     message_id bigint REFERENCES messages (id),
     user_id bigint REFERENCES users (id),
 
-    -- since it can be a custom emote, or unicode emoji
+    -- emoji_type = 0 -> custom emoji
+    -- emoji_type = 1 -> unicode emoji
+    emoji_type int DEFAULT 0,
     emoji_id bigint REFERENCES guild_emoji (id),
-    emoji_text text NOT NULL,
+    emoji_text text,
+
     PRIMARY KEY (message_id, user_id, emoji_id, emoji_text)
 );