feat: added promocode creation and view

solution/api/v1/auth.py

@@ -7,6 +7,7 @@ from ninja.security import HttpBearer
 from pydantic import BaseModel, ValidationError
 
 import apps.business.models
+import apps.user.models
 
 
 class BusinessToken(BaseModel):
@@ -28,7 +29,7 @@ class BusinessAuth(HttpBearer):
 
         try:
             business = apps.business.models.Business.objects.get(
-                id=token_payload.business_id
+                id=token_payload.business_id,
             )
         except apps.business.models.Business.DoesNotExist:
             return None
@@ -37,3 +38,31 @@ class BusinessAuth(HttpBearer):
             return None
 
         return business
+
+
+class UserToken(BaseModel):
+    user_id: uuid.UUID
+    token_version: int
+
+
+class UserAuth(HttpBearer):
+    def authenticate(self, request: HttpRequest, token: str) -> str | None:
+        try:
+            decoded_payload = jwt.decode(
+                token,
+                settings.SECRET_KEY,
+                algorithms=["HS256"],
+            )
+            token_payload = UserToken(**decoded_payload)
+        except (jwt.PyJWTError, ValidationError):
+            return None
+
+        try:
+            user = apps.user.models.User.objects.get(id=token_payload.user_id)
+        except apps.user.models.User.DoesNotExist:
+            return None
+
+        if user.token_version != token_payload.token_version:
+            return None
+
+        return user

solution/api/v1/business/schemas.py

@@ -1,20 +1,20 @@
-import re
+import datetime
 import uuid
-from typing import ClassVar
+from typing import ClassVar, Literal
 
 from ninja import ModelSchema, Schema
-from pydantic import EmailStr, field_validator
+from pydantic import Field
 
 from apps.business.models import Business
+from apps.promo.models import Promocode, PromocodeTarget
 
 
 class BusinessSignUpIn(ModelSchema):
-    email: EmailStr
-
     class Meta:
         model = Business
         fields: ClassVar[list[str]] = [
             Business.name.field.name,
+            Business.email.field.name,
             Business.password.field.name,
         ]
 
@@ -24,27 +24,85 @@ class BusinessSignUpOut(Schema):
     company_id: uuid.UUID
 
 
-class BusinessSignInIn(Schema):
-    email: EmailStr
-    password: str
-
-    @field_validator("password")
-    def validate_password(cls, value: str) -> str:  # noqa: N805
-        pattern = r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,60}$"  # noqa: E501
-        if not re.match(pattern, value):
-            e = (
-                "Password must contain at least 8 characters, one uppercase "
-                "letter, one lowercase letter, one number, and one special "
-                "character (@$!%*?&)."
-            )
-            raise ValueError(e)
-        return value
+class BusinessSignInIn(ModelSchema):
+    class Meta:
+        model = Business
+        fields: ClassVar[list[str]] = [
+            Business.email.field.name,
+            Business.password.field.name,
+        ]
 
 
 class BusinessSignInOut(Schema):
     token: str
 
 
+class PromocodeTarget(ModelSchema):
+    categories: list[str] | None = None
+
+    class Meta:
+        model = PromocodeTarget
+        fields: ClassVar[list[str]] = [
+            PromocodeTarget.age_from.field.name,
+            PromocodeTarget.age_until.field.name,
+            PromocodeTarget.country.field.name,
+            PromocodeTarget.categories.field.name,
+        ]
+
+
+class CreatePromocodeIn(ModelSchema):
+    target: PromocodeTarget
+    promo_unique: list[str] | None = None
+
+    class Meta:
+        model = Promocode
+        fields: ClassVar[list[str]] = [
+            Promocode.description.field.name,
+            Promocode.image_url.field.name,
+            Promocode.max_count.field.name,
+            Promocode.active_from.field.name,
+            Promocode.active_until.field.name,
+            Promocode.mode.field.name,
+            Promocode.promo_common.field.name,
+        ]
+
+
+class CreatePromocodeOut(Schema):
+    id: uuid.UUID
+
+
+class PromocodeListFilters(Schema):
+    limit: int = 10
+    offset: int = 0
+    query: Literal["active_from", "active_until", None] = None
+    country__in: list[str] = Field(None, alias="country")
+
+
+class PromocodeTargetViewOut(Schema):
+    age_from: int | None
+    age_until: int | None
+    country: str | None
+    categories: list[str] | None
+
+
+class PromocodeViewOut(Schema):
+    promo_id: uuid.UUID
+    company_id: uuid.UUID
+    description: str
+    image_url: str | None
+    target: PromocodeTargetViewOut
+    max_count: int
+    active_from: datetime.date | None
+    active_until: datetime.date | None
+    mode: str
+    promo_common: str | None
+    promo_unique: list[str] | None
+    company_name: str
+    like_count: int
+    used_count: int
+    active: bool
+
+
 __all__ = [
     "BusinessSignInIn",
     "BusinessSignInOut",

solution/api/v1/business/views.py

@@ -1,12 +1,18 @@
+import datetime
 from http import HTTPStatus as status
 
-from django.http import HttpRequest
-from ninja import Router
-from ninja.errors import AuthenticationError
+from django.core.exceptions import ValidationError
+from django.db.models import Count, Q, Value
+from django.db.models.functions import Coalesce
+from django.http import HttpRequest, HttpResponse
+from ninja import Query, Router
+from ninja.errors import AuthenticationError, HttpError
 
 from api.v1 import schemas as global_schemas
+from api.v1.auth import BusinessAuth
 from api.v1.business import schemas
 from apps.business.models import Business
+from apps.promo.models import Promocode, PromocodeTarget
 
 router = Router(tags=["business"])
 
@@ -20,13 +26,15 @@ router = Router(tags=["business"])
     },
 )
 def signup(
-    request: HttpRequest, business: schemas.BusinessSignUpIn
+    request: HttpRequest,
+    business: schemas.BusinessSignUpIn,
 ) -> tuple[int, schemas.BusinessSignUpOut]:
     business_obj = Business(**business.dict())
     business_obj.save()
 
     return status.OK, schemas.BusinessSignUpOut(
-        token=business_obj.generate_token(), company_id=business_obj.id
+        token=business_obj.generate_token(),
+        company_id=business_obj.id,
     )
 
 
@@ -39,8 +47,16 @@ def signup(
     },
 )
 def signin(
-    request: HttpRequest, login_data: schemas.BusinessSignInIn
+    request: HttpRequest,
+    login_data: schemas.BusinessSignInIn,
 ) -> tuple[int, schemas.BusinessSignInOut]:
+    business_obj = Business(**dict(login_data))
+    business_obj.validate(
+        include=[Business.email.field, Business.password.field],
+        validate_unique=False,
+        validate_constraints=False,
+    )
+
     try:
         business_obj = Business.objects.get(email=login_data.email)
     except Business.DoesNotExist:
@@ -53,5 +69,167 @@ def signin(
     business_obj.save()
 
     return status.OK, schemas.BusinessSignInOut(
-        token=business_obj.generate_token()
+        token=business_obj.generate_token(),
+    )
+
+
+@router.post(
+    "/promo",
+    auth=BusinessAuth(),
+    response={
+        status.CREATED: schemas.CreatePromocodeOut,
+        status.BAD_REQUEST: global_schemas.ValidationError,
+        status.UNAUTHORIZED: global_schemas.UnauthorizedError,
+    },
+)
+def create_promocode(
+    request: HttpRequest,
+    promocode: schemas.CreatePromocodeIn,
+) -> schemas.CreatePromocodeOut:
+    business = request.auth
+    promocode = dict(promocode)
+    target = dict(promocode.pop("target"))
+
+    target_obj = PromocodeTarget(**target)
+    target_obj.save()
+
+    promocode_obj = Promocode(
+        business=business,
+        target=target_obj,
+        **promocode,
+    )
+    try:
+        promocode_obj.save()
+    except ValidationError as e:
+        target_obj.delete()
+        raise e  # noqa: TRY201
+
+    return status.CREATED, schemas.CreatePromocodeOut(id=promocode_obj.id)
+
+
+@router.get(
+    "/promo",
+    auth=BusinessAuth(),
+    response={
+        status.OK: list[schemas.PromocodeViewOut],
+        status.BAD_REQUEST: global_schemas.ValidationError,
+    },
+    exclude_none=True,
+)
+def list_promocode(
+    request: HttpRequest,
+    filters: Query[schemas.PromocodeListFilters],
+    response: HttpResponse,
+) -> list[schemas.PromocodeViewOut]:
+    business = request.auth
+
+    promocodes = Promocode.objects.filter(business=business)
+
+    if filters.country__in:
+        promocodes = promocodes.filter(
+            Q(target__country__in=filters.country__in)
+            | Q(target__country__isnull=True)
+        )
+
+    if filters.query == "active_from":
+        promocodes = promocodes.annotate(
+            active_from_sort=Coalesce("active_from", Value(datetime.min))
+        ).order_by("-active_from_sort")
+    elif filters.query == "active_until":
+        promocodes = promocodes.annotate(
+            active_until_sort=Coalesce("active_until", Value(datetime.max))
+        ).order_by("-active_until_sort")
+    else:
+        promocodes = promocodes.order_by("-created_at")
+
+    promocodes = promocodes.annotate(
+        used_count=Count("activations"),
+        like_count=Count("comments"),
+    )
+
+    response["X-Total-Count"] = promocodes.count()
+
+    promocodes = promocodes[filters.offset : filters.offset + filters.limit]
+
+    return [
+        schemas.PromocodeViewOut(
+            promo_id=promocode.id,
+            company_id=promocode.business.id,
+            company_name=promocode.business.name,
+            description=promocode.description,
+            image_url=promocode.image_url,
+            target=schemas.PromocodeTargetViewOut(
+                age_from=promocode.target.age_from,
+                age_until=promocode.target.age_until,
+                country=promocode.target.country.code
+                if promocode.target.country
+                else None,
+                categories=promocode.target.categories,
+            ),
+            max_count=promocode.max_count,
+            active_from=promocode.active_from,
+            active_until=promocode.active_until,
+            mode=promocode.mode,
+            promo_common=promocode.promo_common,
+            promo_unique=promocode.promo_unique,
+            like_count=promocode.like_count,
+            used_count=promocode.used_count,
+            active=promocode.active,
+        )
+        for promocode in promocodes
+    ]
+
+
+@router.get(
+    "/promo/{promocode_id}",
+    auth=BusinessAuth(),
+    response={
+        status.OK: schemas.PromocodeViewOut,
+        status.NOT_FOUND: global_schemas.NotFoundError,
+    },
+    exclude_none=True,
+)
+def product_get(
+    request: HttpRequest, promocode_id: str
+) -> schemas.PromocodeViewOut:
+    business = request.auth
+
+    promocodes = Promocode.objects.filter(id=promocode_id)
+
+    if len(promocodes) == 0:
+        raise HttpError(status.NOT_FOUND, status.NOT_FOUND.phrase)
+
+    promocodes = promocodes.annotate(
+        used_count=Count("activations"),
+        like_count=Count("comments"),
+    )
+
+    promocode = promocodes[0]
+
+    if promocode.business != business:
+        raise HttpError(status.FORBIDDEN, status.FORBIDDEN.phrase)
+
+    return schemas.PromocodeViewOut(
+        promo_id=promocode.id,
+        company_id=promocode.business.id,
+        company_name=promocode.business.name,
+        description=promocode.description,
+        image_url=promocode.image_url,
+        target=schemas.PromocodeTargetViewOut(
+            age_from=promocode.target.age_from,
+            age_until=promocode.target.age_until,
+            country=promocode.target.country.code
+            if promocode.target.country
+            else None,
+            categories=promocode.target.categories,
+        ),
+        max_count=promocode.max_count,
+        active_from=promocode.active_from,
+        active_until=promocode.active_until,
+        mode=promocode.mode,
+        promo_common=promocode.promo_common,
+        promo_unique=promocode.promo_unique,
+        like_count=promocode.like_count,
+        used_count=promocode.used_count,
+        active=promocode.active,
     )

solution/api/v1/handlers.py

@@ -46,7 +46,9 @@ def handle_django_validation_error(
 
 
 def handle_authentication_error(
-    request: HttpRequest, exc: errors.AuthenticationError, router: NinjaAPI
+    request: HttpRequest,
+    exc: errors.AuthenticationError,
+    router: NinjaAPI,
 ) -> HttpResponse:
     return router.create_response(
         request,
@@ -56,7 +58,9 @@ def handle_authentication_error(
 
 
 def handle_validation_error(
-    request: HttpRequest, exc: errors.ValidationError, router: NinjaAPI
+    request: HttpRequest,
+    exc: errors.ValidationError,
+    router: NinjaAPI,
 ) -> HttpResponse:
     return router.create_response(
         request,
@@ -66,7 +70,9 @@ def handle_validation_error(
 
 
 def handle_not_found_error(
-    request: HttpRequest, exc: Exception, router: NinjaAPI
+    request: HttpRequest,
+    exc: Exception,
+    router: NinjaAPI,
 ) -> HttpResponse:
     return router.create_response(
         request,
@@ -76,7 +82,9 @@ def handle_not_found_error(
 
 
 def handle_unknown_exception(
-    request: HttpRequest, exc: Exception, router: NinjaAPI
+    request: HttpRequest,
+    exc: Exception,
+    router: NinjaAPI,
 ) -> HttpResponse:
     logger.exception(exc)
 

solution/apps/business/models.py

@@ -1,7 +1,10 @@
+from datetime import timedelta
+
 import jwt
 from django.conf import settings
 from django.core.validators import MinLengthValidator, RegexValidator
 from django.db import models
+from django.utils import timezone
 
 from apps.core.models import BaseModel
 
@@ -17,7 +20,7 @@ class Business(BaseModel):
         max_length=60,
         validators=[
             RegexValidator(
-                r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$"
+                r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$",
             ),
         ],
     )
@@ -31,6 +34,7 @@ class Business(BaseModel):
             {
                 "business_id": str(self.id),
                 "token_version": self.token_version,
+                "exp": timezone.now() + timedelta(hours=24),
             },
             settings.SECRET_KEY,
             algorithm="HS256",

solution/apps/core/models.py

@@ -1,4 +1,5 @@
 import uuid
+from typing import Any
 
 from django.core.exceptions import ValidationError
 from django.db import models
@@ -12,12 +13,35 @@ class BaseModel(models.Model):
     class Meta:
         abstract = True
 
-    def save(self, *args, **kwargs) -> None:  # noqa: ANN002, ANN003
-        self.full_clean(validate_unique=False)
-
-        try:
-            self.validate_unique()
-        except ValidationError as e:
-            raise UniqueConstraintError(e) from None
+    def save(self, *args: Any, **kwargs: Any) -> None:
+        self.validate()
 
         super().save(*args, **kwargs)
+
+    def validate(
+        self,
+        validate_unique: bool = True,
+        validate_constraints: bool = True,
+        include: list[models.Field] | None = None,
+    ) -> None:
+        self.full_clean(
+            validate_unique=False,
+            validate_constraints=False,
+            exclude=(
+                field.name
+                for field in set(self._meta.get_fields()) - set(include)
+            )
+            if include
+            else None,
+        )
+        if validate_unique:
+            try:
+                self.validate_unique()
+            except ValidationError as e:
+                raise UniqueConstraintError(e) from None
+
+        if validate_constraints:
+            try:
+                self.validate_constraints()
+            except ValidationError as e:
+                raise UniqueConstraintError(e) from None

solution/apps/promo/admin.py

@@ -0,0 +1,6 @@
+from django.contrib import admin
+
+from apps.promo.models import Promocode, PromocodeTarget
+
+admin.site.register(Promocode)
+admin.site.register(PromocodeTarget)

solution/apps/promo/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class PromoConfig(AppConfig):
+    name = "apps.promo"
+    label = "promo"

solution/apps/promo/migrations/0001_initial.py

@@ -0,0 +1,80 @@
+# Generated by Django 5.1.5 on 2025-01-21 14:30
+
+import apps.promo.validators
+import django.core.validators
+import django.db.models.deletion
+import django_countries.fields
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('business', '0001_initial'),
+        ('user', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='PromocodeTarget',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('age_from', models.PositiveSmallIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(100)])),
+                ('age_until', models.PositiveSmallIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(0), django.core.validators.MaxValueValidator(100)])),
+                ('country', django_countries.fields.CountryField(blank=True, max_length=2, null=True)),
+                ('categories', models.JSONField(blank=True, default=list, null=True, validators=[apps.promo.validators.TargetCategoriesValidator()])),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='Promocode',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('description', models.TextField(max_length=300, validators=[django.core.validators.MinLengthValidator(10)])),
+                ('image_url', models.URLField(blank=True, max_length=350, null=True)),
+                ('max_count', models.PositiveIntegerField(validators=[django.core.validators.MaxValueValidator(100000000)])),
+                ('active_from', models.DateField(blank=True, null=True)),
+                ('active_until', models.DateField(blank=True, null=True)),
+                ('mode', models.CharField(choices=[('COMMON', 'Common'), ('UNIQUE', 'Unique')], max_length=6)),
+                ('promo_common', models.CharField(blank=True, max_length=30, null=True, validators=[django.core.validators.MinLengthValidator(5)])),
+                ('promo_unique', models.JSONField(blank=True, default=list, null=True, validators=[apps.promo.validators.PromocodeUniqueValidator()])),
+                ('promo_unique_activated', models.JSONField(blank=True, default=list, editable=False, null=True)),
+                ('created_at', models.DateTimeField(auto_now_add=True)),
+                ('business', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='promocodes', to='business.business')),
+                ('target', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='promocodes', to='promo.promocodetarget')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='PromocodeActivation',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('timestamp', models.DateTimeField(auto_now_add=True)),
+                ('promocode', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='activations', to='promo.promocode')),
+                ('user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='activations', to='user.user')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+        migrations.CreateModel(
+            name='PromocodeComment',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('text', models.TextField(max_length=1000, validators=[django.core.validators.MinLengthValidator(10)])),
+                ('date', models.DateTimeField(auto_now_add=True)),
+                ('author', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='comments', to='user.user')),
+                ('promocode', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='comments', to='promo.promocode')),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

solution/apps/promo/models.py

@@ -0,0 +1,171 @@
+from django.core.exceptions import ValidationError
+from django.core.validators import (
+    MaxValueValidator,
+    MinLengthValidator,
+    MinValueValidator,
+)
+from django.db import models
+from django.utils import timezone
+from django_countries.fields import CountryField
+
+from apps.business.models import Business
+from apps.core.models import BaseModel
+from apps.promo.validators import (
+    PromocodeDurationValidator,
+    PromocodeUniqueValidator,
+    TargetAgeValidator,
+    TargetCategoriesValidator,
+)
+from apps.user.models import User
+
+
+class PromocodeTarget(BaseModel):
+    age_from = models.PositiveSmallIntegerField(
+        blank=True,
+        null=True,
+        validators=[MinValueValidator(0), MaxValueValidator(100)],
+    )
+    age_until = models.PositiveSmallIntegerField(
+        blank=True,
+        null=True,
+        validators=[MinValueValidator(0), MaxValueValidator(100)],
+    )
+    country = CountryField(blank=True, null=True)
+    categories = models.JSONField(
+        blank=True,
+        null=True,
+        default=list,
+        validators=[TargetCategoriesValidator()],
+    )
+
+    def __str__(self) -> str:
+        return str(self.id)
+
+    def clean(self) -> None:
+        super().clean()
+
+        TargetAgeValidator()(self)
+
+
+class Promocode(BaseModel):
+    class ModeChoices(models.TextChoices):
+        COMMON = "COMMON"
+        UNIQUE = "UNIQUE"
+
+    business = models.ForeignKey(
+        Business,
+        on_delete=models.CASCADE,
+        related_name="promocodes",
+    )
+    description = models.TextField(
+        max_length=300,
+        validators=[MinLengthValidator(10)],
+    )
+    image_url = models.URLField(max_length=350, blank=True, null=True)
+    target = models.ForeignKey(
+        PromocodeTarget,
+        on_delete=models.CASCADE,
+        related_name="promocodes",
+    )
+    max_count = models.PositiveIntegerField(
+        validators=[MaxValueValidator(100000000)],
+    )
+    active_from = models.DateField(blank=True, null=True)
+    active_until = models.DateField(blank=True, null=True)
+    mode = models.CharField(max_length=6, choices=ModeChoices)
+    promo_common = models.CharField(
+        max_length=30,
+        blank=True,
+        null=True,
+        validators=[MinLengthValidator(5)],
+    )
+    promo_unique = models.JSONField(
+        blank=True,
+        null=True,
+        default=list,
+        validators=[PromocodeUniqueValidator()],
+    )
+    promo_unique_activated = models.JSONField(
+        blank=True,
+        null=True,
+        default=list,
+        editable=False,
+    )
+    created_at = models.DateTimeField(auto_now_add=True)
+
+    def clean(self) -> None:
+        super().clean()
+
+        if self.mode == self.ModeChoices.COMMON:
+            if not self.promo_common:
+                err = {
+                    "promo_common": "Field is required for COMMON mode.",
+                }
+                raise ValidationError(err)
+            if self.promo_unique:
+                err = {
+                    "promo_unique": "Field must be empty for COMMON mode.",
+                }
+                raise ValidationError(err)
+        elif self.mode == self.ModeChoices.UNIQUE:
+            if not self.promo_unique:
+                err = {
+                    "promo_unique": "Field is required for UNIQUE mode.",
+                }
+                raise ValidationError(err)
+            if self.promo_common:
+                err = {
+                    "promo_common": "Field must be empty for UNIQUE mode.",
+                }
+                raise ValidationError(err)
+
+        PromocodeDurationValidator()(self)
+
+    @property
+    def active(self) -> bool:
+        current_date = timezone.datetime.today().date()
+
+        is_active_by_date = (
+            self.active_from is None or self.active_from <= current_date
+        ) and (self.active_until is None or self.active_until >= current_date)
+
+        if self.mode == self.ModeChoices.COMMON:
+            is_active_by_mode = self.activations.count() < self.max_count
+        elif self.mode == self.ModeChoices.UNIQUE:
+            is_active_by_mode = len(self.promo_unique) > len(
+                self.promo_unique_activated
+            )
+
+        return is_active_by_date and is_active_by_mode
+
+
+class PromocodeActivation(BaseModel):
+    promocode = models.ForeignKey(
+        Promocode,
+        on_delete=models.CASCADE,
+        related_name="activations",
+    )
+    user = models.ForeignKey(
+        User,
+        on_delete=models.CASCADE,
+        related_name="activations",
+    )
+    timestamp = models.DateTimeField(auto_now_add=True)
+
+
+class PromocodeComment(BaseModel):
+    promocode = models.ForeignKey(
+        Promocode,
+        on_delete=models.CASCADE,
+        related_name="comments",
+    )
+    author = models.ForeignKey(
+        User,
+        on_delete=models.CASCADE,
+        related_name="comments",
+    )
+    text = models.TextField(
+        max_length=1000,
+        validators=[MinLengthValidator(10)],
+    )
+    date = models.DateTimeField(auto_now_add=True)

solution/apps/promo/validators.py

@@ -0,0 +1,82 @@
+from django.core.exceptions import ValidationError
+from django.core.validators import BaseValidator
+from django.utils.deconstruct import deconstructible
+
+MAX_CATEGORIES_LIST_LEN = 20
+MIN_CATEGORY_LEN = 2
+MAX_CATEGORY_LEN = 20
+
+MIN_UNIQUE_PROMOCODES_LIST_LEN = 1
+MAX_UNIQUE_PROMOCODES_LIST_LEN = 5000
+MIN_UNIQUE_PROMOCODE_LEN = 3
+MAX_UNIQUE_PROMOCODE_LEN = 30
+
+
+class TargetAgeValidator:
+    def __call__(self, instance) -> None:  # noqa: ANN001
+        if (
+            instance.age_from is not None
+            and instance.age_until is not None
+            and instance.age_from > instance.age_until
+        ):
+            err = "age_from can't be greater than age_until"
+            raise ValidationError(err)
+
+
+class PromocodeDurationValidator:
+    def __call__(self, instance) -> None:  # noqa: ANN001
+        if (
+            instance.active_from is not None
+            and instance.active_until is not None
+            and instance.active_from > instance.active_until
+        ):
+            err = "active_from can't be greater than active_until"
+            raise ValidationError(err)
+
+
+@deconstructible
+class TargetCategoriesValidator(BaseValidator):
+    def __init__(self) -> None:
+        pass
+
+    def __call__(self, categories: list) -> None:
+        if not isinstance(categories, list):
+            err = "categories must be a list"
+            raise ValidationError(err)
+
+        if len(categories) > MAX_CATEGORIES_LIST_LEN:
+            err = "max. categories length is 20"
+            raise ValidationError(err)
+
+        for category in categories:
+            if not (MIN_CATEGORY_LEN <= len(category) <= MAX_CATEGORY_LEN):
+                err = "category name length must be >=2 and <=20"
+                raise ValidationError(err)
+
+
+@deconstructible
+class PromocodeUniqueValidator(BaseValidator):
+    def __init__(self) -> None:
+        pass
+
+    def __call__(self, promocodes: list) -> None:
+        if not isinstance(promocodes, list):
+            err = "unque promocodes must be a list"
+            raise ValidationError(err)
+
+        if not (
+            MIN_UNIQUE_PROMOCODES_LIST_LEN
+            <= len(promocodes)
+            <= MAX_UNIQUE_PROMOCODES_LIST_LEN
+        ):
+            err = "unique promocodes length must be >=1 and <=5000"
+            raise ValidationError(err)
+
+        for promocode in promocodes:
+            if not (
+                MIN_UNIQUE_PROMOCODE_LEN
+                <= len(promocode)
+                <= MAX_UNIQUE_PROMOCODE_LEN
+            ):
+                err = "unique promocode length must be >=3 and <=30"
+                raise ValidationError(err)

solution/apps/user/admin.py

@@ -0,0 +1,5 @@
+from django.contrib import admin
+
+from apps.user.models import User
+
+admin.site.register(User)

solution/apps/user/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class UserConfig(AppConfig):
+    name = "apps.user"
+    label = "user"

solution/apps/user/migrations/0001_initial.py

@@ -0,0 +1,34 @@
+# Generated by Django 5.1.5 on 2025-01-21 11:05
+
+import django.core.validators
+import django_countries.fields
+import uuid
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='User',
+            fields=[
+                ('id', models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
+                ('name', models.CharField(max_length=100, validators=[django.core.validators.MinLengthValidator(1)])),
+                ('surname', models.CharField(max_length=120, validators=[django.core.validators.MinLengthValidator(1)])),
+                ('email', models.EmailField(max_length=120, unique=True, validators=[django.core.validators.MinLengthValidator(8)])),
+                ('avatar_url', models.URLField(blank=True, max_length=350, null=True)),
+                ('age', models.PositiveSmallIntegerField(validators=[django.core.validators.MaxValueValidator(100)])),
+                ('country', django_countries.fields.CountryField(max_length=2)),
+                ('password', models.CharField(max_length=60, validators=[django.core.validators.RegexValidator('^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[@$!%*?&])[A-Za-z\\d@$!%*?&]{8,}$')])),
+                ('token_version', models.BigIntegerField(default=0)),
+            ],
+            options={
+                'abstract': False,
+            },
+        ),
+    ]

solution/apps/user/models.py

@@ -0,0 +1,53 @@
+from datetime import timedelta
+
+import jwt
+from django.conf import settings
+from django.core.validators import (
+    MaxValueValidator,
+    MinLengthValidator,
+    RegexValidator,
+)
+from django.db import models
+from django.utils import timezone
+from django_countries.fields import CountryField
+
+from apps.core.models import BaseModel
+
+
+class User(BaseModel):
+    name = models.CharField(max_length=100, validators=[MinLengthValidator(1)])
+    surname = models.CharField(
+        max_length=120,
+        validators=[MinLengthValidator(1)],
+    )
+    email = models.EmailField(
+        unique=True,
+        max_length=120,
+        validators=[MinLengthValidator(8)],
+    )
+    avatar_url = models.URLField(max_length=350, blank=True, null=True)
+    age = models.PositiveSmallIntegerField(validators=[MaxValueValidator(100)])
+    country = CountryField(max_length=2)
+    password = models.CharField(
+        max_length=60,
+        validators=[
+            RegexValidator(
+                r"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$",
+            ),
+        ],
+    )
+    token_version = models.BigIntegerField(default=0)
+
+    def __str__(self) -> str:
+        return f"{self.surname} {self.name}"
+
+    def generate_token(self) -> str:
+        return jwt.encode(
+            {
+                "user_id": str(self.id),
+                "token_version": self.token_version,
+                "exp": timezone.now() + timedelta(hours=24),
+            },
+            settings.SECRET_KEY,
+            algorithm="HS256",
+        )

solution/config/handlers.py

@@ -4,7 +4,8 @@ from django.http import HttpRequest, JsonResponse
 
 
 def handler400(
-    request: HttpRequest, exception: Exception | None = None
+    request: HttpRequest,
+    exception: Exception | None = None,
 ) -> JsonResponse:
     return JsonResponse(
         status=status.BAD_REQUEST,
@@ -13,7 +14,8 @@ def handler400(
 
 
 def handler403(
-    request: HttpRequest, exception: Exception | None = None
+    request: HttpRequest,
+    exception: Exception | None = None,
 ) -> JsonResponse:
     return JsonResponse(
         status=status.FORBIDDEN,
@@ -22,7 +24,8 @@ def handler403(
 
 
 def handler404(
-    request: HttpRequest, exception: Exception | None = None
+    request: HttpRequest,
+    exception: Exception | None = None,
 ) -> JsonResponse:
     return JsonResponse(
         status=status.NOT_FOUND,
@@ -31,7 +34,8 @@ def handler404(
 
 
 def handler500(
-    request: HttpRequest, exception: Exception | None = None
+    request: HttpRequest,
+    exception: Exception | None = None,
 ) -> JsonResponse:
     return JsonResponse(
         status=status.INTERNAL_SERVER_ERROR,

solution/config/notifiers/telegram.py

@@ -69,7 +69,9 @@ class LoggingHandler(logging.Handler):
 
         for attempt in range(1, self.retries + 1):
             response = httpx.post(
-                self.api_url, data=payload, timeout=self.timeout
+                self.api_url,
+                data=payload,
+                timeout=self.timeout,
             )
             if response.status_code != httpx.codes.OK:
                 if attempt == self.retries:
@@ -86,7 +88,8 @@ class LoggingHandler(logging.Handler):
     def format(self, record: logging.LogRecord) -> str:
         try:
             asctime = datetime.datetime.fromtimestamp(
-                record.created, tz=get_current_timezone()
+                record.created,
+                tz=get_current_timezone(),
             ).strftime("%Y-%m-%d %H:%M:%S %Z")
             level_emoji = LEVEL_EMOJIS.get(record.levelname, "")
 
@@ -111,7 +114,8 @@ class LoggingHandler(logging.Handler):
                 formatted_message += f" #{record.correlation_id}"
         except Exception as format_error:  # noqa: BLE001
             TELEGRAM_LOG_HANDLER.exception(
-                "Error formatting log record: %s", format_error
+                "Error formatting log record: %s",
+                format_error,
             )
             return f"Error formatting log record: {format_error}"
         else:

solution/config/settings.py

@@ -52,7 +52,7 @@ CACHES = {
         "LOCATION": REDIS_URI,
         "TIMEOUT": None,
         "KEY_PREFIX": "django",
-    }
+    },
 }
 
 
@@ -72,22 +72,22 @@ AUTH_PASSWORD_VALIDATORS = [
         "NAME": (
             "django.contrib.auth."
             "password_validation.UserAttributeSimilarityValidator"
-        )
+        ),
     },
     {
         "NAME": (
             "django.contrib.auth.password_validation.MinimumLengthValidator"
-        )
+        ),
     },
     {
         "NAME": (
             "django.contrib.auth.password_validation.CommonPasswordValidator"
-        )
+        ),
     },
     {
         "NAME": (
             "django.contrib.auth.password_validation.NumericPasswordValidator"
-        )
+        ),
     },
 ]
 
@@ -244,15 +244,18 @@ WSGI_APPLICATION = "config.wsgi.application"
 # Telegram
 
 NOTIFIER_TELEGRAM_BOT_TOKEN = env(
-    "DJANGO_NOTIFIER_TELEGRAM_BOT_TOKEN", default=None
+    "DJANGO_NOTIFIER_TELEGRAM_BOT_TOKEN",
+    default=None,
 )
 
 NOTIFIER_TELEGRAM_CHAT_ID = env(
-    "DJANGO_NOTIFIER_TELEGRAM_CHAT_ID", default=None
+    "DJANGO_NOTIFIER_TELEGRAM_CHAT_ID",
+    default=None,
 )
 
 NOTIFIER_TELEGRAM_THREAD_ID = env(
-    "DJANGO_NOTIFIER_TELEGRAM_THREAD_ID", default=None
+    "DJANGO_NOTIFIER_TELEGRAM_THREAD_ID",
+    default=None,
 )
 
 
@@ -416,6 +419,8 @@ INSTALLED_APPS = [
     # Internal apps
     "apps.core",
     "apps.business",
+    "apps.user",
+    "apps.promo",
     # API v1 apps
     "api.v1.ping",
     "api.v1.business",
@@ -531,7 +536,7 @@ TEMPLATES = [
             "string_if_invalid": "",
             "file_charset": "utf-8",
         },
-    }
+    },
 ]