diff --git a/litecord/blueprints/channel/messages.py b/litecord/blueprints/channel/messages.py
index 1a3d6b5..8e375b1 100644
--- a/litecord/blueprints/channel/messages.py
+++ b/litecord/blueprints/channel/messages.py
@@ -17,65 +17,37 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 """
 
-import json
 from pathlib import Path
 
-from PIL import Image
 from quart import Blueprint, request, current_app as app, jsonify
 from logbook import Logger
 
 from litecord.blueprints.auth import token_check
 from litecord.blueprints.checks import channel_check, channel_perm_check
 from litecord.blueprints.dms import try_dm_state
-from litecord.errors import MessageNotFound, Forbidden, BadRequest
+from litecord.errors import MessageNotFound, Forbidden
 from litecord.enums import MessageType, ChannelType, GUILD_CHANS
 from litecord.snowflake import get_snowflake
 from litecord.schemas import validate, MESSAGE_CREATE
-from litecord.utils import pg_set_json
+from litecord.utils import pg_set_json, query_tuple_from_args, extract_limit
 from litecord.permissions import get_permissions
 
 from litecord.embed.sanitizer import fill_embed
 from litecord.embed.messages import process_url_embed
-from litecord.blueprints.channel.dm_checks import dm_pre_check
+from litecord.common.channels import dm_pre_check, try_dm_state
 from litecord.images import try_unlink
+from litecord.common.messages import (
+    msg_create_request,
+    msg_create_check_content,
+    msg_add_attachment,
+    msg_guild_text_mentions,
+)
 
 
 log = Logger(__name__)
 bp = Blueprint("channel_messages", __name__)
 
 
-def extract_limit(request_, default: int = 50, max_val: int = 100):
-    """Extract a limit kwarg."""
-    try:
-        limit = int(request_.args.get("limit", default))
-
-        if limit not in range(0, max_val + 1):
-            raise ValueError()
-    except (TypeError, ValueError):
-        raise BadRequest("limit not int")
-
-    return limit
-
-
-def query_tuple_from_args(args: dict, limit: int) -> tuple:
-    """Extract a 2-tuple out of request arguments."""
-    before, after = None, None
-
-    if "around" in request.args:
-        average = int(limit / 2)
-        around = int(args["around"])
-
-        after = around - average
-        before = around + average
-
-    elif "before" in args:
-        before = int(args["before"])
-    elif "after" in args:
-        before = int(args["after"])
-
-    return before, after
-
-
 @bp.route("/<int:channel_id>/messages", methods=["GET"])
 async def get_messages(channel_id):
     user_id = await token_check()
@@ -204,185 +176,6 @@ async def create_message(
     return message_id
 
 
-async def msg_guild_text_mentions(
-    payload: dict, guild_id: int, mentions_everyone: bool, mentions_here: bool
-):
-    """Calculates mention data side-effects."""
-    channel_id = int(payload["channel_id"])
-
-    # calculate the user ids we'll bump the mention count for
-    uids = set()
-
-    # first is extracting user mentions
-    for mention in payload["mentions"]:
-        uids.add(int(mention["id"]))
-
-    # then role mentions
-    for role_mention in payload["mention_roles"]:
-        role_id = int(role_mention)
-        member_ids = await app.storage.get_role_members(role_id)
-
-        for member_id in member_ids:
-            uids.add(member_id)
-
-    # at-here only updates the state
-    # for the users that have a state
-    # in the channel.
-    if mentions_here:
-        uids = set()
-
-        await app.db.execute(
-            """
-        UPDATE user_read_state
-        SET mention_count = mention_count + 1
-        WHERE channel_id = $1
-        """,
-            channel_id,
-        )
-
-    # at-here updates the read state
-    # for all users, including the ones
-    # that might not have read permissions
-    # to the channel.
-    if mentions_everyone:
-        uids = set()
-
-        member_ids = await app.storage.get_member_ids(guild_id)
-
-        await app.db.executemany(
-            """
-        UPDATE user_read_state
-        SET mention_count = mention_count + 1
-        WHERE channel_id = $1 AND user_id = $2
-        """,
-            [(channel_id, uid) for uid in member_ids],
-        )
-
-    for user_id in uids:
-        await app.db.execute(
-            """
-        UPDATE user_read_state
-        SET mention_count = mention_count + 1
-        WHERE user_id = $1
-            AND channel_id = $2
-        """,
-            user_id,
-            channel_id,
-        )
-
-
-async def msg_create_request() -> tuple:
-    """Extract the json input and any file information
-    the client gave to us in the request.
-
-    This only applies to create message route.
-    """
-    form = await request.form
-    request_json = await request.get_json() or {}
-
-    # NOTE: embed isn't set on form data
-    json_from_form = {
-        "content": form.get("content", ""),
-        "nonce": form.get("nonce", "0"),
-        "tts": json.loads(form.get("tts", "false")),
-    }
-
-    payload_json = json.loads(form.get("payload_json", "{}"))
-
-    json_from_form.update(request_json)
-    json_from_form.update(payload_json)
-
-    files = await request.files
-
-    # we don't really care about the given fields on the files dict, so
-    # we only extract the values
-    return json_from_form, [v for k, v in files.items()]
-
-
-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_files = len(files) > 0
-
-    embed_field = "embeds" if use_embeds else "embed"
-    has_embed = embed_field in payload and payload.get(embed_field) is not None
-
-    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 msg_add_attachment(message_id: int, channel_id: int, attachment_file) -> int:
-    """Add an attachment to a message.
-
-    Parameters
-    ----------
-    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.
-    """
-
-    attachment_id = get_snowflake()
-    filename = attachment_file.filename
-
-    # understand file info
-    mime = attachment_file.mimetype
-    is_image = mime.startswith("image/")
-
-    img_width, img_height = None, None
-
-    # extract file size
-    # TODO: this is probably inneficient
-    file_size = attachment_file.stream.getbuffer().nbytes
-
-    if is_image:
-        # open with pillow, extract image size
-        image = Image.open(attachment_file.stream)
-        img_width, img_height = image.size
-
-        # NOTE: DO NOT close the image, as closing the image will
-        # also close the stream.
-
-        # reset it to 0 for later usage
-        attachment_file.stream.seek(0)
-
-    await app.db.execute(
-        """
-        INSERT INTO attachments
-            (id, channel_id, message_id,
-             filename, filesize,
-             image, width, height)
-        VALUES
-            ($1, $2, $3, $4, $5, $6, $7, $8)
-        """,
-        attachment_id,
-        channel_id,
-        message_id,
-        filename,
-        file_size,
-        is_image,
-        img_width,
-        img_height,
-    )
-
-    ext = filename.split(".")[-1]
-
-    with open(f"attachments/{attachment_id}.{ext}", "wb") as attach_file:
-        attach_file.write(attachment_file.stream.read())
-
-    log.debug("written {} bytes for attachment id {}", file_size, attachment_id)
-
-    return attachment_id
-
-
 async def _spawn_embed(payload, **kwargs):
     app.sched.spawn(process_url_embed(payload, **kwargs))