webhooks: add drafts for execution impl

- channel.messages: export msg_create_request,
    msg_create_check_payload, msg_add_attachment
 - schemas: add WEBHOOK_MESSAGE_CREATE

litecord/blueprints/channel/messages.py

@@ -249,7 +249,7 @@ async def _guild_text_mentions(payload: dict, guild_id: int,
         """, user_id, channel_id)
 
 
-async def _msg_input() -> tuple:
+async def msg_create_request() -> tuple:
     """Extract the json input and any file information
     the client gave to us in the request.
 
@@ -277,19 +277,21 @@ async def _msg_input() -> tuple:
     return json_from_form, [v for k, v in files.items()]
 
 
-def _check_content(payload: dict, files: list):
+def msg_create_check_content(payload: dict, files: list, *, use_embeds=False):
     """Check if there is actually any content being sent to us."""
     has_content = bool(payload.get('content', ''))
-    has_embed = 'embed' in payload
     has_files = len(files) > 0
 
+    embed_field = 'embeds' if use_embeds else 'embed'
+    has_embed = embed_field in payload
+
     has_total_content = has_content or has_embed or has_files
 
     if not has_total_content:
         raise BadRequest('No content has been provided.')
 
 
-async def _add_attachment(message_id: int, channel_id: int,
+async def msg_add_attachment(message_id: int, channel_id: int,
                              attachment_file) -> int:
     """Add an attachment to a message.
 
@@ -297,6 +299,12 @@ async def _add_attachment(message_id: int, channel_id: int,
     ----------
     message_id: int
         The ID of the message getting the attachment.
+    channel_id: int
+        The ID of the channel the message belongs to.
+
+        Exists because the attachment URL scheme contains
+        a channel id. The purpose is unknown, but we are
+        implementing Discord's behavior.
     attachment_file: quart.FileStorage
         quart FileStorage instance of the file.
     """
@@ -362,10 +370,10 @@ async def _create_message(channel_id):
         await channel_perm_check(user_id, channel_id, 'send_messages')
         actual_guild_id = guild_id
 
-    payload_json, files = await _msg_input()
+    payload_json, files = await msg_create_request()
     j = validate(payload_json, MESSAGE_CREATE)
 
-    _check_content(payload_json, files)
+    msg_create_check_content(payload_json, files)
 
     # TODO: check connection to the gateway
 
@@ -399,7 +407,7 @@ async def _create_message(channel_id):
 
     # for each file given, we add it as an attachment
     for pre_attachment in files:
-        await _add_attachment(message_id, channel_id, pre_attachment)
+        await msg_add_attachment(message_id, channel_id, pre_attachment)
 
     payload = await app.storage.get_message(message_id, user_id)
 

litecord/blueprints/webhooks.py

@@ -27,12 +27,21 @@ from litecord.blueprints.checks import (
     channel_check, channel_perm_check, guild_check, guild_perm_check
 )
 
-from litecord.schemas import validate, WEBHOOK_CREATE, WEBHOOK_UPDATE
+from litecord.schemas import (
+    validate, WEBHOOK_CREATE, WEBHOOK_UPDATE, WEBHOOK_MESSAGE_CREATE
+)
 from litecord.enums import ChannelType
 from litecord.snowflake import get_snowflake
 from litecord.utils import async_map
 from litecord.errors import WebhookNotFound, Unauthorized
 
+from litecord.blueprints.channel.messages import (
+    msg_create_request, msg_create_check_content, msg_add_attachment,
+    # create_message
+)
+from litecord.embed.sanitizer import fill_embed
+from litecord.embed.messages import process_url_embed
+
 bp = Blueprint('webhooks', __name__)
 
 
@@ -108,15 +117,17 @@ async def _webhook_many(where_clause, arg: int):
 
 async def webhook_token_check(webhook_id: int, webhook_token: str):
     """token_check() equivalent for webhooks."""
-    webhook_id_fetch = await app.db.fetchrow("""
-    SELECT id
+    row = await app.db.fetchrow("""
+    SELECT guild_id, channel_id
     FROM webhooks
     WHERE id = $1 AND token = $2
     """, webhook_id, webhook_token)
 
-    if webhook_id_fetch is None:
+    if row is None:
         raise Unauthorized('webhook not found or unauthorized')
 
+    return row['guild_id'], row['channel_id']
+
 
 @bp.route('/channels/<int:channel_id>/webhooks', methods=['POST'])
 async def create_webhook(channel_id: int):
@@ -259,17 +270,64 @@ async def del_webhook_tokened(webhook_id, webhook_token):
     return '', 204
 
 
-@bp.route('/webhooks/<int:webhook_id>/<webhook_token>', methods=['POST'])
-async def execute_webhook(webhook_id, webhook_token):
+async def create_message_webhook(guild_id, channel_id, webhook_id, j):
+    # TODO: impl
     pass
 
 
+@bp.route('/webhooks/<int:webhook_id>/<webhook_token>', methods=['POST'])
+async def execute_webhook(webhook_id: int, webhook_token):
+    """Execute a webhook. Sends a message to the channel the webhook
+    is tied to."""
+    guild_id, channel_id = await webhook_token_check(webhook_id, webhook_token)
+
+    # TODO: ensure channel_id points to guild text channel
+
+    payload_json, files = await msg_create_request()
+    j = validate(payload_json, WEBHOOK_MESSAGE_CREATE)
+
+    msg_create_check_content(j, files)
+
+    # webhooks don't need permissions.
+    mentions_everyone = '@everyone' in j['content']
+    mentions_here = '@here' in j['content']
+
+    message_id = await create_message_webhook(
+        guild_id, channel_id, webhook_id, {
+            'content': j.get('content', ''),
+            'tts': j.get('tts', False),
+
+            'everyone_mention': mentions_everyone or mentions_here,
+            'embeds': [await fill_embed(e) for e in j['embeds']]
+        }
+    )
+
+    for pre_attachment in files:
+        await msg_add_attachment(message_id, channel_id, pre_attachment)
+
+    payload = await app.storage.get_message(message_id)
+
+    # spawn embedder in the background, even when we're on a webhook.
+    app.sched.spawn(
+        process_url_embed(
+            app.config, app.storage, app.dispatcher, app.session,
+            payload
+        )
+    )
+
+    # TODO: is it really 204?
+    return '', 204
+
 @bp.route('/webhooks/<int:webhook_id>/<webhook_token>/slack',
           methods=['POST'])
 async def execute_slack_webhook(webhook_id, webhook_token):
-    pass
+    """Execute a webhook but expecting Slack data."""
+    # TODO: know slack webhooks
+    await webhook_token_check(webhook_id, webhook_token)
 
 
 @bp.route('/webhooks/<int:webhook_id>/<webhook_token>/github', methods=['POST'])
 async def execute_github_webhook(webhook_id, webhook_token):
-    pass
+    """Execute a webhook but expecting GitHub data."""
+    # TODO: know github webhooks
+    await webhook_token_check(webhook_id, webhook_token)

litecord/schemas.py

@@ -697,3 +697,27 @@ WEBHOOK_UPDATE = {
     'avatar': {'type': 'b64_icon', 'required': False, 'nullable': False},
     'channel_id': {'coerce': int, 'required': False, 'nullable': False}
 }
+
+WEBHOOK_MESSAGE_CREATE = {
+    'content': {
+        'type': 'string',
+        'minlength': 0, 'maxlength': 2000, 'required': False
+    },
+    'tts': {'type': 'boolean', 'required': False},
+
+    'username': {
+        'type': 'string',
+        'minlength': 2, 'maxlength': 32, 'required': False
+    },
+
+    # TODO: url type, or something...
+    'avatar_url': {
+        'type': 'url', 'required': False
+    },
+
+    'embeds': {
+        'type': list,
+        'required': False,
+        'schema': {'type': 'dict', 'schema': EMBED_OBJECT}
+    }
+}