105 lines
3.7 KiB
PL/PgSQL
105 lines
3.7 KiB
PL/PgSQL
CREATE TABLE IF NOT EXISTS "channel"
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(
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"id" UUID NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
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"name" VARCHAR NOT NULL,
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"type" INT2 NOT NULL,
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"position" INT2 NOT NULL,
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"server_id" UUID REFERENCES "server" ("id") ON DELETE CASCADE, -- only for server channels
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"parent" UUID REFERENCES "channel" ("id") ON DELETE SET NULL, -- only for server channels
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"owner_id" UUID REFERENCES "user" ("id") ON DELETE SET NULL -- only for group channels
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);
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-- only for dm or group channels
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CREATE TABLE IF NOT EXISTS "channel_recipient"
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(
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"channel_id" UUID NOT NULL REFERENCES "channel" ("id") ON DELETE CASCADE,
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"user_id" UUID NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE,
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PRIMARY KEY ("channel_id", "user_id")
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);
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CREATE TABLE IF NOT EXISTS "message"
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(
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"id" UUID NOT NULL PRIMARY KEY DEFAULT uuid_generate_v7(),
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"author_id" UUID NOT NULL REFERENCES "user" ("id") ON DELETE CASCADE,
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"channel_id" UUID NOT NULL REFERENCES "channel" ("id") ON DELETE CASCADE,
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"content" TEXT NOT NULL
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);
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CREATE TABLE IF NOT EXISTS "message_attachment"
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(
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"message_id" UUID NOT NULL REFERENCES "message" ON DELETE CASCADE,
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"file_id" UUID NOT NULL REFERENCES "file" ON DELETE CASCADE,
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"order" INT2 NOT NULL,
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PRIMARY KEY ("message_id", "file_id")
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);
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ALTER TABLE "channel"
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ADD COLUMN "last_message_id" UUID REFERENCES "message" ("id") ON DELETE SET NULL;
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CREATE OR REPLACE FUNCTION create_dm_channel(
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user1_id UUID,
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user2_id UUID,
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channel_type INT2
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)
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RETURNS UUID
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LANGUAGE plpgsql
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AS
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$$
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DECLARE
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new_channel_id UUID;
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channel_name VARCHAR;
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BEGIN
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-- Validate parameters
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IF user1_id IS NULL OR user2_id IS NULL THEN
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RAISE EXCEPTION 'Both user IDs must be provided';
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END IF;
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IF user1_id = user2_id THEN
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RAISE EXCEPTION 'Cannot create a DM channel with the same user';
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END IF;
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-- Check if users exist
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IF NOT exists (SELECT 1 FROM "user" WHERE id = user1_id) OR
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NOT exists (SELECT 1 FROM "user" WHERE id = user2_id) THEN
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RAISE EXCEPTION 'One or both users do not exist';
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END IF;
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-- Check if DM already exists between these users
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IF exists (SELECT 1
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FROM channel c
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JOIN channel_recipient cr1 ON c.id = cr1.channel_id AND cr1.user_id = user1_id
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JOIN channel_recipient cr2 ON c.id = cr2.channel_id AND cr2.user_id = user2_id
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WHERE c.type = channel_type
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AND (SELECT count(*) FROM channel_recipient WHERE channel_id = c.id) = 2) THEN
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-- Find and return the existing channel ID
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SELECT c.id
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INTO new_channel_id
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FROM channel c
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JOIN channel_recipient cr1 ON c.id = cr1.channel_id AND cr1.user_id = user1_id
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JOIN channel_recipient cr2 ON c.id = cr2.channel_id AND cr2.user_id = user2_id
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WHERE c.type = channel_type
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AND (SELECT count(*) FROM channel_recipient WHERE channel_id = c.id) = 2
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LIMIT 1;
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RAISE NOTICE 'DM channel already exists between these users with ID: %', new_channel_id;
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RETURN new_channel_id;
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END IF;
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-- Generate channel name (conventionally uses user IDs in DMs)
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channel_name := concat(user1_id, '-', user2_id);
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-- Create new channel
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INSERT INTO "channel" ("name", "type", "position")
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VALUES (channel_name, channel_type, 0)
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RETURNING id INTO new_channel_id;
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-- Add both users as recipients
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INSERT INTO "channel_recipient" ("channel_id", "user_id")
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VALUES (new_channel_id, user1_id),
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(new_channel_id, user2_id);
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RAISE NOTICE 'DM channel created with ID: %', new_channel_id;
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RETURN new_channel_id;
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END;
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$$; |