diff --git a/delivery1/server/app.py b/delivery1/server/app.py
index cb701d8..fc669fb 100644
--- a/delivery1/server/app.py
+++ b/delivery1/server/app.py
@@ -1,3 +1,4 @@
+import os
 import sqlalchemy.exc
 from flask import Flask, request, jsonify
 from routes import org_bp, user_bp, file_bp
@@ -37,6 +38,12 @@ def reset():
         with app.app_context():
             db_connection.drop_all()
             db_connection.create_all()
+        repos = os.path.join(os.path.dirname(os.path.abspath(__file__)), "repository")
+        for repo in os.listdir(repos):
+            if os.path.isdir(os.path.join(repos, repo)):
+                for file in os.listdir(os.path.join(repos, repo)):
+                    os.remove(os.path.join(repos, repo, file))
+                os.rmdir(os.path.join(repos, repo))
     except sqlalchemy.exc.OperationalError:
         return jsonify({"error": "Database error"}), 500
     return jsonify({"message": "Database reset"}), 200
diff --git a/delivery1/server/models/file.py b/delivery1/server/models/file.py
index b99847e..8288403 100644
--- a/delivery1/server/models/file.py
+++ b/delivery1/server/models/file.py
@@ -5,16 +5,16 @@ class File(db_connection.Model):
     __tablename__ = 'files'
 
     id = db_connection.Column(db_connection.Integer, primary_key=True, index=True)
-    file_handle = db_connection.Column(db_connection.String, unique=True, nullable=False)
-    document_handle = db_connection.Column(db_connection.String, unique=True, nullable=True)
+    file_handle = db_connection.Column(db_connection.String, unique=True, nullable=True)
+    document_handle = db_connection.Column(db_connection.String, unique=True, nullable=False)
     name = db_connection.Column(db_connection.String, nullable=False)
     created_at = db_connection.Column(db_connection.Integer, nullable=False)
-    # alg: db_connection.Column(db_connection.String, nullable=False)
-    # key: db_connection.Column(db_connection.String, nullable=False)
+    key = db_connection.Column(db_connection.String, nullable=False)
+    alg = db_connection.Column(db_connection.String, nullable=False)
     org_id = db_connection.Column(db_connection.Integer, db_connection.ForeignKey('organizations.id'), nullable=False)
     creator_id = db_connection.Column(db_connection.Integer, db_connection.ForeignKey('users.id'), nullable=False)
-    org = db_connection.relationship('Organization', back_populates='files')
-    creator = db_connection.relationship('User', back_populates='files')
+    org = db_connection.relationship('Organization', backref=db_connection.backref('org_files', uselist=False))
+    creator = db_connection.relationship('User', backref=db_connection.backref('created_files', uselist=False))
 
     def to_dict(self):
         return {
@@ -23,6 +23,8 @@ class File(db_connection.Model):
             "document_handle": self.document_handle,
             "name": self.name,
             "created_at": self.created_at,
+            "key": self.key,
+            "alg": self.alg,
             "org": {"id": self.org.id, "name": self.org.name},
             "creator": {"id": self.creator.id, "username": self.creator.username}
         }
\ No newline at end of file
diff --git a/delivery1/server/models/org.py b/delivery1/server/models/org.py
index 53c1adb..1a9b356 100644
--- a/delivery1/server/models/org.py
+++ b/delivery1/server/models/org.py
@@ -6,20 +6,19 @@ class Organization(db_connection.Model):
     id = db_connection.Column(db_connection.Integer, primary_key=True, index=True)
     name = db_connection.Column(db_connection.String, unique=True, index=True, nullable=False)
     users = db_connection.Column(db_connection.JSON, nullable=False, default=dict)
-    owner_id = db_connection.Column(db_connection.Integer, db_connection.ForeignKey('users.id'))
-    owner = db_connection.relationship('User', backref=db_connection.backref('owned_organization', uselist=False))
-    files = db_connection.relationship('File', back_populates='org')
+    users_id = db_connection.Column(db_connection.Integer, db_connection.ForeignKey('users.id'))
+    manager = db_connection.relationship('User', backref=db_connection.backref('owned_organization', uselist=False))
 
     def to_dict(self):
         return {
             "id": self.id,
             "name": self.name,
-            "owner": self.owner.to_dict(),
+            "manager": self.manager.to_dict(),
             "users": [{"id": user_id, "user_data": {
                 "username": user_data["username"],
                 "full_name": user_data["full_name"],
                 "email": user_data["email"],
                 "status": user_data["status"]
             }} for user_id, user_data in self.users.items()],
-            "files": [{"id": file.id, "name": file.name, "file_handle": file.file_handle} for file in self.files]
+            # "files": [{"id": file.id, "name": file.name, "file_handle": file.file_handle} for file in self.files]
         }
\ No newline at end of file
diff --git a/delivery1/server/models/user.py b/delivery1/server/models/user.py
index df03020..0e019eb 100644
--- a/delivery1/server/models/user.py
+++ b/delivery1/server/models/user.py
@@ -12,8 +12,6 @@ class User(db_connection.Model):
     public_keys = db_connection.Column(db_connection.JSON, nullable=False, default=dict)
     orgs = db_connection.Column(db_connection.JSON, nullable=False, default=dict)
 
-    files = db_connection.relationship('File', back_populates='creator')
-
     def to_dict(self):
         return {
             "id": self.id,
@@ -21,5 +19,5 @@ class User(db_connection.Model):
             "full_name": self.full_name,
             "email": self.email,
             "orgs": [{"id": org_id, "name": org_data["name"], "status": org_data["status"]} for org_id, org_data in self.orgs.items()],
-            "files": [{"id": file.id, "name": file.name, "file_handle": file.file_handle} for file in self.files]
+            # "files": [{"id": file.id, "name": file.name, "file_handle": file.file_handle} for file in self.files]
         }
\ No newline at end of file
diff --git a/delivery1/server/routes/file.py b/delivery1/server/routes/file.py
index 7373c46..b3ab3bc 100644
--- a/delivery1/server/routes/file.py
+++ b/delivery1/server/routes/file.py
@@ -1,14 +1,175 @@
-from flask import Blueprint, request, jsonify
-from services import FileService
+from flask import Blueprint, request, jsonify, send_file, Response
+
+import utils
+from services import FileService, OrganizationService, UserService, SessionService
 
 file_bp = Blueprint("file", __name__)
+upload_service = FileService()
 
-@file_bp.route("/get", methods=["GET"])
-def file_get():
-    data = request.json
-    file_handle = data["file_handle"]
+
+@file_bp.route("/get/<string:file_handle>/content", methods=["GET"])
+def file_get_content(file_handle: str):
     file = FileService.get_file_by_file_handle(file_handle)
     if not file:
         return jsonify({"error": "File not found"}), 404
-    return jsonify(file.to_dict()), 200
 
+    file_content = FileService.get_file_content(file)
+    return send_file(file_content, as_attachment=True, download_name=file.name)
+
+
+@file_bp.route("/get/<string:document_handle>/metadata", methods=["GET"])
+def file_get_metadata(document_handle: str):
+    session_token = request.headers.get("Authorization")
+    session = SessionService.validate_session(session_token)
+    if isinstance(session, tuple):
+        return session
+
+    org = OrganizationService.get_organization(session.org_id)
+    if not org:
+        return jsonify({"error": "Organization not found"}), 404
+
+    file = FileService.get_file_by_document_handle(document_handle)
+    if not file:
+        return jsonify({"error": "File not found"}), 404
+
+    return jsonify(file.to_dict())
+
+
+@file_bp.route("/upload/metadata", methods=["POST"])
+def file_upload_metadata():
+    session_token = request.headers.get("Authorization")
+    print(session_token)
+    session = SessionService.validate_session(session_token)
+    if isinstance(session, tuple):
+        return session
+
+    data = request.json
+    if "document_name" not in data or "key" not in data or "alg" not in data:
+        return jsonify({"error": "Missing required fields"}), 400
+
+    org = OrganizationService.get_organization(session.org_id)
+    if not org:
+        return jsonify({"error": "Organization not found"}), 404
+
+    user = UserService.get_user(session.user_id)
+    if not user:
+        return jsonify({"error": "User not found"}), 404
+
+    file = upload_service.create_file(session.token, org, user, data["document_name"], data["key"], data["alg"])
+    return jsonify(file.to_dict()), 201
+
+
+@file_bp.route("/upload/content", methods=["POST"])
+def file_upload_content():
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
+
+    session = SessionService.validate_session(session_token)
+    if isinstance(session, tuple):
+        return session
+
+    if "file" not in request.files:
+        return jsonify({"error": "No file data"}), 400
+
+    file = request.files.get("file")
+    if file.filename == "":
+        return jsonify({"error": "No file selected for uploading"}), 400
+
+    if not file:
+        return jsonify({"error": "Invalid file data"}), 400
+
+    file = upload_service.write_file(session_token, file.stream)
+    if isinstance(file, tuple):
+        return file
+
+    return jsonify(file.to_dict()), 201
+
+
+@file_bp.route("/list", methods=["GET"])
+def file_list():
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
+
+    session = SessionService.validate_session(session_token)
+    if isinstance(session, tuple):
+        return session
+
+
+    data = request.json
+
+    org = OrganizationService.get_organization(session.org_id)
+    if not org:
+        return jsonify({"error": "Organization not found"}), 404
+
+    if "datetime" in data:
+        try:
+            datetime_value = int(data["datetime"]["value"])
+            datetime_relation = data["datetime"]["relation"]
+        except ValueError:
+            return jsonify({"error": "Invalid datetime value"}), 400
+
+    if "username" in data:
+        user = UserService.get_user_by_username(data["username"])
+        if not user:
+            return jsonify({"error": "User not found"}), 404
+        files = FileService.list_files_in_org(org)
+        return jsonify([file.to_dict() for file in files if file.creator_id == user.id and (
+            utils.check_valid_time(file.created_at, datetime_value, datetime_relation)
+            if "datetime" in data else True
+        )])
+
+    files = FileService.list_files_in_org(org)
+    return jsonify([file.to_dict() for file in files if (utils.check_valid_time(file.created_at, datetime_value, datetime_relation) if "datetime" in data else True)])
+
+
+@file_bp.route("/delete/<string:document_handle>", methods=["POST"])
+def file_delete(document_handle: str):
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
+
+    session = SessionService.validate_session(session_token)
+    if isinstance(session, tuple):
+        return session
+
+    org = OrganizationService.get_organization(session.org_id)
+    if not org:
+        return jsonify({"error": "Organization not found"}), 404
+
+    file = FileService.get_file_by_document_handle(document_handle)
+    if not file:
+        return jsonify({"error": "File not found"}), 404
+
+    if file.creator_id != session.user_id:
+        return jsonify({"error": "Not authorized to delete file"}), 403
+
+    file = FileService.delete_file(file)
+    return jsonify(file.to_dict())
+
+
+################################################
+
+
+@file_bp.route("/create_dummy", methods=["POST"])
+def file_create_dummy():
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
+
+    session = SessionService.validate_session(session_token)
+
+    if isinstance(session, tuple):
+        return session
+
+    org = OrganizationService.get_organization(session.org_id)
+    if not org:
+        return jsonify({"error": "Organization not found"}), 404
+
+    user = UserService.get_user(session.user_id)
+    if not user:
+        return jsonify({"error": "User not found"}), 404
+
+    file = FileService.create_dummy_file(org, user)
+    return jsonify(file.to_dict()), 201
\ No newline at end of file
diff --git a/delivery1/server/routes/user.py b/delivery1/server/routes/user.py
index 5c1c670..7ac7a13 100644
--- a/delivery1/server/routes/user.py
+++ b/delivery1/server/routes/user.py
@@ -1,13 +1,17 @@
 import json
+import utils
 from flask import Blueprint, request, jsonify
 from services import UserService, SessionService, OrganizationService
-from utils import data_checks
 
 user_bp = Blueprint("user", __name__)
 
 @user_bp.route("/login", methods=["POST"])
 def user_login():
     data = request.json
+
+    if "username" not in data or "org" not in data:
+        return jsonify({"error": "Missing required fields"}), 400
+
     user = UserService.get_user_by_username(data["username"])
     if not user:
         return jsonify({"error": "User not found"}), 404
@@ -16,25 +20,17 @@ def user_login():
     if not org:
         return jsonify({"error": "Organization not found"}), 404
 
-    id_str = str(org.id)
-    if id_str not in user.public_keys:
-        return jsonify({"error": "User not associated with organization"}), 403
-
-    if user.public_keys[id_str] != data["public_key"]:
-        return jsonify({"error": "Invalid public key"}), 403
-
     session = SessionService.create_session(user, org)
     return jsonify(session.to_dict()), 201
 
 
 @user_bp.route("/logout", methods=["POST"])
 def user_logout():
-    data = request.json
-    session_file = data["session_file"]
-    session_data = json.loads(session_file)
-    session_token = session_data["token"]
-    session = SessionService.get_session(session_token)
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
 
+    session = SessionService.get_session(session_token)
     if not session:
         return jsonify({"error": "Not authenticated"}), 401
 
@@ -44,17 +40,16 @@ def user_logout():
 
 @user_bp.route("/list", methods=["GET"])
 def user_list():
-    data = request.json
-    if "session_file" not in data:
-        return jsonify({"error": "No session file"}), 400
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
 
-    session_file = data["session_file"]
-    session_data = json.loads(session_file)
-
-    session = data_checks.validate_session_file(session_data)
+    session = SessionService.validate_session(session_token)
     if isinstance(session, tuple):
         return session
 
+    data = request.json
+
     org = OrganizationService.get_organization(session.org_id)
     if not org:
         return jsonify({"error": "Organization not found"}), 404
@@ -71,22 +66,23 @@ def user_list():
 
 @user_bp.route("/create", methods=["POST"])
 def user_create():
-    data = request.json
-    if "session_file" not in data or "username" not in data or "full_name" not in data or "email" not in data or "public_key" not in data:
-        return jsonify({"error": "Missing required fields"}), 400
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
 
-    session_file = data["session_file"]
-    session_data = json.loads(session_file)
-
-    session = data_checks.validate_session_file(session_data)
+    session = SessionService.validate_session(session_token)
     if isinstance(session, tuple):
         return session
 
+    data = request.json
+    if "username" not in data or "full_name" not in data or "email" not in data or "public_key" not in data:
+        return jsonify({"error": "Missing required fields"}), 400
+
     org = OrganizationService.get_organization(session.org_id)
     if not org:
         return jsonify({"error": "Organization not found"}), 404
 
-    if org.owner.id != session.user_id:
+    if org.manager.id != session.user_id:
         return jsonify({"error": "Not authorized to create users"}), 403
 
     user = UserService.get_user_by_username(data["username"])
@@ -102,52 +98,46 @@ def user_create():
     return jsonify(user.to_dict()), 201
 
 
-@user_bp.route("/suspend", methods=["POST"])
-def user_suspend():
-    data = request.json
-    if "session_file" not in data or "username" not in data:
-        return jsonify({"error": "Missing required fields"}), 400
+@user_bp.route("/<string:username>/suspend", methods=["POST"])
+def user_suspend(username):
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
 
-    session_file = data["session_file"]
-    session_data = json.loads(session_file)
-
-    session = data_checks.validate_session_file(session_data)
+    session = SessionService.validate_session(session_token)
     if isinstance(session, tuple):
         return session
 
     org = OrganizationService.get_organization(session.org_id)
     if not org:
         return jsonify({"error": "Organization not found"}), 404
-    if org.owner.id != session.user_id:
+    if org.manager.id != session.user_id:
         return jsonify({"error": "Not authorized to suspend users"}), 403
 
-    user = UserService.get_user_by_username(data["username"])
+    user = UserService.get_user_by_username(username)
     if not user:
         return jsonify({"error": "User not found"}), 404
 
     return OrganizationService.suspend_user(org, user)
 
 
-@user_bp.route("/activate", methods=["POST"])
-def user_unsuspend():
-    data = request.json
-    if "session_file" not in data or "username" not in data:
-        return jsonify({"error": "Missing required fields"}), 400
+@user_bp.route("/<string:username>/activate", methods=["POST"])
+def user_unsuspend(username):
+    session_token = request.headers.get("Authorization")
+    if not session_token:
+        return jsonify({"error": "No session token"}), 400
 
-    session_file = data["session_file"]
-    session_data = json.loads(session_file)
-
-    session = data_checks.validate_session_file(session_data)
+    session = SessionService.validate_session(session_token)
     if isinstance(session, tuple):
         return session
 
     org = OrganizationService.get_organization(session.org_id)
     if not org:
         return jsonify({"error": "Organization not found"}), 404
-    if org.owner.id != session.user_id:
+    if org.manager.id != session.user_id:
         return jsonify({"error": "Not authorized to unsuspend users"}), 403
 
-    user = UserService.get_user_by_username(data["username"])
+    user = UserService.get_user_by_username(username)
     if not user:
         return jsonify({"error": "User not found"}), 404
 
diff --git a/delivery1/server/services/files.py b/delivery1/server/services/files.py
index 83c465b..28498a1 100644
--- a/delivery1/server/services/files.py
+++ b/delivery1/server/services/files.py
@@ -1,12 +1,57 @@
 import os
+import io
 from datetime import datetime
 from typing import List, Type
+from flask import jsonify
 
 from database import db
 from models import File, Organization, User
+from utils import get_hash
 
 
 class FileService:
+    def __init__(self):
+        self.current_requests = {}
+
+    def create_file(self, session_token: str, org: Organization, user: User, file_name: str, key: str, alg: str) -> File:
+        file = File(
+            file_handle = None,
+            document_handle = get_hash(file_name),
+            name = file_name,
+            created_at = int(datetime.now().timestamp()),
+            key = key,
+            alg = alg,
+            org_id = org.id,
+            creator_id = user.id,
+            org = org,
+            creator = user
+        )
+
+        self.current_requests[session_token] = file
+
+        db.add(file)
+        db.commit()
+        db.refresh(file)
+        return file
+
+
+    def write_file(self, session_token: str, file_data: bytes) -> File | tuple:
+        if session_token not in self.current_requests:
+            return jsonify({"error": "No file upload request found"}), 400
+
+        file = self.current_requests[session_token]
+        file_path = os.path.join(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "repository"), file.org.name, file.document_handle)
+        with open(file_path, "wb") as f:
+            f.write(file_data)
+
+        file.file_handle = get_hash(file_data)
+        db.commit()
+        db.refresh(file)
+
+        del self.current_requests[session_token]
+        return file
+
+
     @staticmethod
     def create_dummy_file(org: Organization, user: User) -> File:
         file = File(
@@ -41,6 +86,12 @@ class FileService:
     def get_file_by_file_handle(file_handle: str) -> File | None:
         return db.query(File).filter(File.file_handle == file_handle).first()
 
+    @staticmethod
+    def get_file_content(file: File) -> io.BytesIO:
+        file_path = os.path.join(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "repository"), file.org.name, file.document_handle)
+        with open(file_path, "rb") as f:
+            return io.BytesIO(f.read())
+
     @staticmethod
     def list_files() -> list[Type[File]]:
         return db.query(File).all()
@@ -51,9 +102,9 @@ class FileService:
 
     @staticmethod
     def delete_file(file: File) -> File:
-        file_path = os.path.join(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "repository"), file.document_handle)
+        file_path = os.path.join(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "repository"), file.org.name, file.document_handle)
         os.remove(file_path)
-        file.document_handle = None
+        file.file_handle = None
         db.commit()
         db.refresh(file)
         return file
\ No newline at end of file
diff --git a/delivery1/server/services/orgs.py b/delivery1/server/services/orgs.py
index 746b4e2..a5e7388 100644
--- a/delivery1/server/services/orgs.py
+++ b/delivery1/server/services/orgs.py
@@ -20,7 +20,7 @@ class OrganizationService:
 
         organization = Organization(
             name=name,
-            owner=user,
+            manager=user,
             users={user.id: {
                 "username": user.username,
                 "full_name": user.full_name,
@@ -76,8 +76,8 @@ class OrganizationService:
         if OrganizationService.get_user_status(org, user.id) != "active":
             return {"error": "User already suspended"}, 400
 
-        if org.owner.id == user.id:
-            return {"error": "Cannot suspend owner"}, 400
+        if org.manager.id == user.id:
+            return {"error": "Cannot suspend manager"}, 400
 
         org.users[str(user.id)]["status"] = "suspended"
         flag_modified(org, "users")
diff --git a/delivery1/server/services/sessions.py b/delivery1/server/services/sessions.py
index 9885e92..c322a1f 100644
--- a/delivery1/server/services/sessions.py
+++ b/delivery1/server/services/sessions.py
@@ -1,6 +1,7 @@
 import secrets
 from database import db
 from models import Session, User, Organization
+from flask import jsonify
 
 
 class SessionService:
@@ -23,4 +24,25 @@ class SessionService:
     @staticmethod
     def delete_session(session: Session) -> None:
         db.delete(session)
-        db.commit()
\ No newline at end of file
+        db.commit()
+
+    @staticmethod
+    def validate_session(token: str) -> tuple | Session:
+        from services import OrganizationService
+
+        if "Bearer" in token:
+            token = token.split(" ")[1]
+
+        session = SessionService.get_session(token)
+        if not session:
+            return jsonify({"error": "Not authenticated"}), 401
+
+        org = OrganizationService.get_organization(session.org_id)
+        if not org:
+            return jsonify({"error": "Organization not found"}), 404
+
+        status = OrganizationService.get_user_status(org, session.user_id)
+        if status != "active":
+            return jsonify({"error": "User is not active"}), 403
+
+        return session
diff --git a/delivery1/server/tests/file_management.http b/delivery1/server/tests/file_management.http
new file mode 100644
index 0000000..167b431
--- /dev/null
+++ b/delivery1/server/tests/file_management.http
@@ -0,0 +1,106 @@
+### Reset database
+POST http://localhost:5000/reset
+Content-Type: application/json
+
+{
+  "password": "123"
+}
+
+### Create a new organization
+POST http://localhost:5000/org/create
+Content-Type: application/json
+
+{
+  "name": "org",
+  "username": "username",
+  "full_name": "Full Name",
+  "email": "user@mail.com",
+  "public_key": "null"
+}
+
+### Login
+POST http://localhost:5000/user/login
+Content-Type: application/json
+
+{
+  "username": "username",
+  "org": "org"
+}
+
+> {% client.global.set("token", response.body["token"]) %}
+
+### Upload dummy file metadata
+POST http://localhost:5000/file/upload/metadata
+Content-Type: application/json
+Authorization: {{token}}
+
+{
+  "document_name": "dummy_file.txt",
+  "key": "arfarf",
+  "alg": "ftgtrg"
+}
+
+> {% client.global.set("document_handle", response.body["document_handle"]) %}
+
+
+#### Upload dummy file content, through send file
+#POST http://localhost:5000/file/upload/content
+#Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
+#Authorization: {{token}}
+#
+#----WebKitFormBoundary7MA4YWxkTrZu0gW
+#Content-Disposition: form-data; name="file"; filename="dummy_file.txt"
+#Content-Type: text/plain
+#
+#This is a dummy file
+#----WebKitFormBoundary7MA4YWxkTrZu0gW
+
+### List files (with no data)
+GET http://localhost:5000/file/list
+Content-Type: application/json
+Authorization: {{token}}
+
+{}
+
+### List files by user
+GET http://localhost:5000/file/list
+Content-Type: application/json
+Authorization: {{token}}
+
+{
+  "username": "username"
+}
+
+### List files by datetime
+GET http://localhost:5000/file/list
+Content-Type: application/json
+Authorization: {{token}}
+
+{
+  "datetime": {
+    "relation": "ot",
+    "value": "1731863876"
+  }
+}
+
+### Get file metadata
+GET http://localhost:5000/file/get/{{document_handle}}/metadata
+Content-Type: application/json
+Authorization: {{token}}
+
+> {% client.global.set("file_handle", response.body["file_handle"]) %}
+
+### Get file content
+GET http://localhost:5000/file/get/{{file_handle}}/content
+Content-Type: application/json
+Authorization: {{token}}
+
+### Delete dummy file
+POST http://localhost:5000/file/delete/{{document_handle}}
+Content-Type: application/json
+Authorization: {{token}}
+
+### Logout
+POST http://localhost:5000/user/logout
+Content-Type: application/json
+Authorization: {{token}}
diff --git a/delivery1/server/utils/__init__.py b/delivery1/server/utils/__init__.py
index 5edd78f..cfb2387 100644
--- a/delivery1/server/utils/__init__.py
+++ b/delivery1/server/utils/__init__.py
@@ -1 +1,2 @@
-from .data_checks import validate_session_file
\ No newline at end of file
+from .checks import check_valid_time
+from .hashing import get_hash
\ No newline at end of file
diff --git a/delivery1/server/utils/checks.py b/delivery1/server/utils/checks.py
new file mode 100644
index 0000000..2d8755c
--- /dev/null
+++ b/delivery1/server/utils/checks.py
@@ -0,0 +1,9 @@
+def check_valid_time(time: int, relation_time: int, relation: str) -> bool:
+    if relation == 'ot':
+        return time < relation_time
+    elif relation == 'nt':
+        return time > relation_time
+    elif relation == 'eq':
+        return time == relation_time
+    else:
+        raise ValueError('Invalid relation: {}'.format(relation))
diff --git a/delivery1/server/utils/data_checks.py b/delivery1/server/utils/data_checks.py
deleted file mode 100644
index 7f31068..0000000
--- a/delivery1/server/utils/data_checks.py
+++ /dev/null
@@ -1,28 +0,0 @@
-import json
-from flask import jsonify
-from services import SessionService, OrganizationService
-from models import Session
-
-def validate_session_file(data) -> tuple | Session:
-    """
-    Check if the session file is valid, and return the session object if it is
-    :param data: session file data (json)
-    :return: Session object or error response
-    """
-    if "token" not in data:
-        return jsonify({"error": "No session token"}), 400
-    session_token = data["token"]
-
-    session = SessionService.get_session(session_token)
-    if not session:
-        return jsonify({"error": "Not authenticated"}), 401
-
-    org = OrganizationService.get_organization(session.org_id)
-    if not org:
-        return jsonify({"error": "Organization not found"}), 404
-
-    status = OrganizationService.get_user_status(org, session.user_id)
-    if status != "active":
-        return jsonify({"error": "User is not active"}), 403
-
-    return session
\ No newline at end of file
diff --git a/delivery1/server/utils/hashing.py b/delivery1/server/utils/hashing.py
new file mode 100644
index 0000000..f03531c
--- /dev/null
+++ b/delivery1/server/utils/hashing.py
@@ -0,0 +1,8 @@
+import cryptography.hazmat.primitives.hashes
+
+def get_hash(data):
+    if isinstance(data, str):
+        data = data.encode('utf-8')
+    digest = cryptography.hazmat.primitives.hashes.Hash(cryptography.hazmat.primitives.hashes.SHA256())
+    digest.update(data)
+    return digest.finalize().hex()
\ No newline at end of file