WIP checkpoint: US-1: Asset Import Pipeline \u2014 glTF upload endpoint with metadata extraction

- Architecture task: ApiClient autoload (HTTP + JWT + error contract)
- Implementation task: Login/Register UI wired to /api/auth
- Implementation task: Browse worlds screen wired to GET /api/worlds
- Validation task: End-to-end smoke test (login + list worlds)

backend/alembic/env.py

@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import create_async_engine
 
 from app.config import settings
 from app.database import Base
-from app.models import user, session, world, asset, group  # noqa: F401
+from app.models import user, session, world, asset  # noqa: F401
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.

backend/alembic/versions/0001_initial.py

@@ -19,16 +19,16 @@ depends_on: Union[str, Sequence[str], None] = None
 
 def upgrade() -> None:
     """Upgrade database schema."""
-    # Create ENUM types (create once, reuse below)
-    world_visibility_enum = postgresql.ENUM(
+    # Create ENUM types
+    world_visibility = postgresql.ENUM(
         "public", "private", "friends_only", name="world_visibility"
     )
-    world_visibility_enum.create(op.get_bind(), checkfirst=True)
+    world_visibility.create(op.get_bind(), checkfirst=True)
 
-    asset_type_enum = postgresql.ENUM(
+    asset_type = postgresql.ENUM(
         "image", "audio", "video", "document", "model_3d", "other", name="asset_type"
     )
-    asset_type_enum.create(op.get_bind(), checkfirst=True)
+    asset_type.create(op.get_bind(), checkfirst=True)
 
     # Create users table
     op.create_table(
@@ -59,7 +59,7 @@ def upgrade() -> None:
     )
     op.create_index(op.f("ix_sessions_token"), "sessions", ["token"], unique=True)
 
-    # Create worlds table — reuse world_visibility_enum (no second create)
+    # Create worlds table
     op.create_table(
         "worlds",
         sa.Column("id", sa.Integer(), primary_key=True),
@@ -68,7 +68,10 @@ def upgrade() -> None:
         sa.Column("owner_id", sa.Integer(), nullable=False),
         sa.Column(
             "visibility",
-            world_visibility_enum,
+            postgresql.ENUM(
+                "public", "private", "friends_only", name="world_visibility",
+                create_type=False,
+            ),
             nullable=True,
         ),
         sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
@@ -77,7 +80,7 @@ def upgrade() -> None:
     )
     op.create_index(op.f("ix_worlds_id"), "worlds", ["id"], unique=False)
 
-    # Create assets table — reuse asset_type_enum (no second create)
+    # Create assets table
     op.create_table(
         "assets",
         sa.Column("id", sa.Integer(), primary_key=True),
@@ -85,7 +88,10 @@ def upgrade() -> None:
         sa.Column("description", sa.Text(), nullable=True),
         sa.Column(
             "asset_type",
-            asset_type_enum,
+            postgresql.ENUM(
+                "image", "audio", "video", "document", "model_3d", "other",
+                name="asset_type", create_type=False,
+            ),
             nullable=False,
         ),
         sa.Column("file_path", sa.String(length=512), nullable=False),

backend/alembic/versions/0003_add_groups_and_members.py

@@ -1,78 +0,0 @@
-"""add groups and group_members tables
-
-Revision ID: 0003_add_groups_and_members
-Revises: 0002_add_date_of_birth_to_users
-Create Date: 2025-01-01 00:00:00.000000
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import postgresql
-
-# revision identifiers, used by Alembic.
-revision: str = "0003_add_groups_and_members"
-down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    """Create groups and group_members tables."""
-    # Create group_member_role ENUM type
-    group_member_role = postgresql.ENUM(
-        "owner", "admin", "member", name="group_member_role"
-    )
-    group_member_role.create(op.get_bind(), checkfirst=True)
-
-    # Create groups table
-    op.create_table(
-        "groups",
-        sa.Column("id", sa.Integer(), primary_key=True, index=True),
-        sa.Column("name", sa.String(length=255), nullable=False),
-        sa.Column("description", sa.Text(), nullable=True),
-        sa.Column(
-            "owner_id",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="CASCADE"),
-            nullable=False,
-        ),
-        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
-        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), onupdate=sa.func.now()),
-    )
-
-    # Create group_members table
-    op.create_table(
-        "group_members",
-        sa.Column(
-            "group_id",
-            sa.Integer(),
-            sa.ForeignKey("groups.id", ondelete="CASCADE"),
-            primary_key=True,
-        ),
-        sa.Column(
-            "user_id",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="CASCADE"),
-            primary_key=True,
-        ),
-        sa.Column(
-            "role",
-            postgresql.ENUM(
-                "owner", "admin", "member", name="group_member_role", create_type=False
-            ),
-            nullable=False,
-            default="member",
-        ),
-        sa.Column("joined_at", sa.DateTime(timezone=True), server_default=sa.func.now()),
-    )
-
-
-def downgrade() -> None:
-    """Drop group_members and groups tables."""
-    op.drop_table("group_members")
-    op.drop_table("groups")
-
-    # Drop group_member_role ENUM type
-    postgresql.ENUM(name="group_member_role").drop(op.get_bind(), checkfirst=True)

backend/app/models/__init__.py

@@ -2,6 +2,5 @@ from app.models.user import User
 from app.models.session import Session
 from app.models.world import World
 from app.models.asset import Asset
-from app.models.group import Group, GroupMember, GroupMemberRole
 
-__all__ = ["User", "Session", "World", "Asset", "Group", "GroupMember", "GroupMemberRole"]
+__all__ = ["User", "Session", "World", "Asset"]

backend/app/models/group.py

@@ -1,56 +0,0 @@
-import enum
-
-from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, Enum
-from sqlalchemy.orm import relationship
-from sqlalchemy.sql import func
-
-from app.database import Base
-
-
-class GroupMemberRole(str, enum.Enum):
-    OWNER = "owner"
-    ADMIN = "admin"
-    MEMBER = "member"
-
-
-class Group(Base):
-    __tablename__ = "groups"
-
-    id = Column(Integer, primary_key=True, index=True)
-    name = Column(String(255), nullable=False)
-    description = Column(Text, nullable=True)
-    owner_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False)
-    created_at = Column(DateTime(timezone=True), server_default=func.now())
-    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
-
-    owner = relationship("User", back_populates="owned_groups")
-    members = relationship(
-        "GroupMember",
-        back_populates="group",
-        cascade="all, delete-orphan",
-        order_by="GroupMember.joined_at",
-    )
-
-
-class GroupMember(Base):
-    __tablename__ = "group_members"
-
-    group_id = Column(
-        Integer,
-        ForeignKey("groups.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    user_id = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="CASCADE"),
-        primary_key=True,
-    )
-    role = Column(
-        Enum(GroupMemberRole, name="group_member_role", create_type=False),
-        nullable=False,
-        default=GroupMemberRole.MEMBER,
-    )
-    joined_at = Column(DateTime(timezone=True), server_default=func.now())
-
-    group = relationship("Group", back_populates="members")
-    user = relationship("User", back_populates="group_memberships")

backend/app/models/user.py

@@ -23,8 +23,6 @@ class User(Base):
     sessions = relationship("Session", back_populates="user", cascade="all, delete-orphan")
     worlds = relationship("World", back_populates="owner")
     assets = relationship("Asset", back_populates="owner")
-    owned_groups = relationship("Group", back_populates="owner")
-    group_memberships = relationship("GroupMember", back_populates="user")
 
     @property
     def is_adult(self) -> bool:

backend/app/routers/assets.py

@@ -1,5 +1,6 @@
 """Asset management router."""
 
+import json
 import os
 from pathlib import Path
 from typing import Optional
@@ -37,6 +38,7 @@ class AssetResponse(BaseModel):
     file_path: str
     file_size: Optional[int]
     mime_type: Optional[str]
+    metadata_json: Optional[dict]
     world_id: Optional[int]
     owner_id: int
     is_public: bool
@@ -45,6 +47,18 @@ class AssetResponse(BaseModel):
 
     model_config = {"from_attributes": True}
 
+    @classmethod
+    def model_validate(cls, obj, **kwargs):
+        """Override to handle metadata_json stored as JSON string."""
+        if isinstance(obj, dict):
+            obj = dict(obj)
+            if "metadata_json" in obj and isinstance(obj["metadata_json"], str):
+                try:
+                    obj["metadata_json"] = json.loads(obj["metadata_json"])
+                except (json.JSONDecodeError, TypeError):
+                    obj["metadata_json"] = None
+        return super().model_validate(obj, **kwargs)
+
 
 class AssetUpdate(BaseModel):
     """Schema for updating an asset."""
@@ -64,6 +78,144 @@ def _sanitize_filename(filename: str) -> str:
     return safe or "file"
 
 
+def _extract_gltf_metadata(content: bytes) -> Optional[dict]:
+    """Extract metadata from a glTF/GLB file.
+
+    Returns a dict with mesh_count, vertex_count, has_animation, texture_refs
+    if the file is a valid glTF/GLB, or None otherwise.
+
+    Uses only the standard library (struct, json) so no extra dependencies
+    are required.
+    """
+    if not content:
+        return None
+
+    # --- GLB detection ---
+    # GLB magic: 0x676C5442 ("glTF") followed by version 2 and payload length.
+    if len(content) >= 12:
+        magic = int.from_bytes(content[0:4], "little")
+        if magic == 0x46546C67:  # "glTF"
+            version = int.from_bytes(content[4:8], "little")
+            if version == 2:
+                return _parse_glb(content)
+
+    # --- .gltf JSON detection ---
+    # Try parsing as JSON; if it has a top-level "scene" or "scenes" key,
+    # it's likely a .gltf file.
+    try:
+        data = json.loads(content)
+    except (json.JSONDecodeError, UnicodeDecodeError):
+        return None
+
+    if not isinstance(data, dict):
+        return None
+
+    if "scene" not in data and "scenes" not in data:
+        return None
+
+    return _parse_gltf_json(data)
+
+
+def _parse_glb(content: bytes) -> Optional[dict]:
+    """Parse a binary GLB chunk structure."""
+    # Header: magic(4) + version(4) + length(4) = 12 bytes
+    # Then chunks: length(4) + type(4) + data...
+    offset = 12
+    json_start = None
+    json_length = 0
+    binary_start = None
+    binary_length = 0
+
+    while offset < len(content):
+        if offset + 8 > len(content):
+            break
+        chunk_length = int.from_bytes(content[offset:offset + 4], "little")
+        chunk_type = int.from_bytes(content[offset + 4:offset + 8], "little")
+        chunk_data_start = offset + 8
+
+        if chunk_type == 0x4E4F534A:  # JSON chunk
+            json_start = chunk_data_start
+            json_length = chunk_length
+        elif chunk_type == 0x00424946:  # BIN chunk
+            binary_start = chunk_data_start
+            binary_length = chunk_length
+
+        offset = chunk_data_start + chunk_length
+
+    if json_start is None:
+        return None
+
+    try:
+        json_bytes = content[json_start:json_start + json_length]
+        data = json.loads(json_bytes)
+    except (json.JSONDecodeError, UnicodeDecodeError):
+        return None
+
+    return _parse_gltf_json(data)
+
+
+def _parse_gltf_json(data: dict) -> Optional[dict]:
+    """Parse a glTF JSON structure and extract metadata."""
+    meshes = data.get("meshes") or []
+    animations = data.get("animations") or []
+    textures = data.get("textures") or []
+    images = data.get("images") or []
+    accessors = data.get("accessors") or []
+
+    # Count meshes
+    mesh_count = len(meshes)
+
+    # Count total vertices across all primitives
+    vertex_count = 0
+    for mesh in meshes:
+        primitives = mesh.get("primitives") or []
+        for primitive in primitives:
+            indices = primitive.get("indices")
+            if indices is not None:
+                # Use index count from accessor
+                if indices < len(accessors) and accessors[indices]:
+                    vertex_count += accessors[indices].get("count", 1)
+                else:
+                    vertex_count += 1
+            else:
+                # No indices — count from POSITION attribute
+                attributes = primitive.get("attributes") or {}
+                pos_accessor = attributes.get("POSITION")
+                if pos_accessor is not None:
+                    if pos_accessor < len(accessors) and accessors[pos_accessor]:
+                        vertex_count += accessors[pos_accessor].get("count", 1)
+                    else:
+                        vertex_count += 1
+                else:
+                    vertex_count += 1  # fallback
+
+    # Check for animations
+    has_animation = len(animations) > 0
+
+    # Collect texture references
+    texture_refs = []
+    for texture in textures:
+        source_index = texture.get("source")
+        ref = {}
+        if source_index is not None and source_index < len(images):
+            image = images[source_index]
+            if isinstance(image, dict):
+                if image.get("name"):
+                    ref["name"] = image["name"]
+                if image.get("uri"):
+                    ref["uri"] = image["uri"]
+                if image.get("mimeType"):
+                    ref["mime_type"] = image["mimeType"]
+        texture_refs.append(ref)
+
+    return {
+        "mesh_count": mesh_count,
+        "vertex_count": vertex_count,
+        "has_animation": has_animation,
+        "texture_refs": texture_refs,
+    }
+
+
 # --- Endpoints ---
 
 @router.post("/", response_model=AssetResponse, status_code=201)
@@ -204,6 +356,13 @@ async def upload_asset_file(
     asset.mime_type = file.content_type
     asset.file_size = file_size
 
+    # Extract glTF metadata for glTF/GLB files.
+    filename_lower = (file.filename or "").lower()
+    if filename_lower.endswith(".glb") or filename_lower.endswith(".gltf"):
+        metadata = _extract_gltf_metadata(content)
+        if metadata is not None:
+            asset.metadata_json = json.dumps(metadata)
+
     await db.commit()
     await db.refresh(asset)
     return asset

backend/docker-compose.yml

@@ -8,7 +8,7 @@ services:
       POSTGRES_PASSWORD: agp_password
       POSTGRES_DB: agp_db
     ports:
-      - "${POSTGRES_PORT:-5432}:5432"
+      - "${POSTGRES_HOST_PORT:-5432}:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
     healthcheck:
@@ -20,7 +20,7 @@ services:
   redis:
     image: redis:7-alpine
     ports:
-      - "${REDIS_PORT:-6379}:6379"
+      - "${REDIS_HOST_PORT:-6379}:6379"
     volumes:
       - redis_data:/data
     healthcheck:

docs/planning/client-server-wiring.md

@@ -0,0 +1,37 @@
+# MVP Vertical Slice: Client-Server Wiring — Plan
+
+## Goal
+Prove the real Godot client and the real backend can talk: **a user can register/log in
+and see a list of worlds from the game client**. Nothing more. Gameplay, join-a-world,
+chat, avatar, Discovery search/tags/trending, Social/Economy/Trust & Safety are all
+explicitly out of scope.
+
+## Verified backend contract (as of this writing)
+- `POST /api/auth/register` — JSON body `{username, email, password, date_of_birth}`.
+  `date_of_birth` is a `YYYY-MM-DD` string. Returns `201 {access_token, token_type}`.
+  Rejects under-18 with `400`.
+- `POST /api/auth/login` — OAuth2 **form-encoded** (`application/x-www-form-urlencoded`)
+  `username` + `password` (this is NOT a JSON endpoint). Returns `{access_token, token_type}`.
+- `GET /api/worlds` — **requires auth** (`CurrentUser`), returns a JSON array of
+  `{id, name, description, visibility, owner_id, created_at}`. There is no unauthenticated
+  public-worlds path, so the worlds list screen can only be shown after login/register.
+- `GET /api/health` — unauthenticated, `{status, app}`.
+- Base URL: uvicorn default `http://127.0.0.1:8000` (must be configurable in the client).
+- CORS is irrelevant to the native Godot `HTTPRequest` client (no browser origin).
+
+## Task breakdown
+| # | Type | Task | Depends on |
+|---|------|------|-----------|
+| 1 | architecture | `ApiClient` autoload: HTTP + JWT storage + error contract | — |
+| 2 | implementation | Main-menu **login** wiring (form-encoded) | 1 |
+| 3 | implementation | Main-menu **register** wiring (JSON + age gate) | 2 |
+| 4 | implementation | **World list** screen consuming `GET /api/worlds` | 2 |
+| 5 | testing | End-to-end headless smoke test + manual verify | 1,3,4 |
+
+## Design decisions captured (resolved in task 1)
+- Token storage: in-memory singleton property for the MVP; a `save_to_disk` seam is left
+  open but not required yet (no re-login on restart in this slice).
+- Error contract: every call returns a discriminated result (`ok`/`error`) so callers
+  never crash on network failure; non-2xx surfaces `{status, detail}` from the backend.
+- Base URL: read from a ProjectSetting, defaulting to `http://127.0.0.1:8000`.
+- Login is form-encoded; register is JSON — the client helper must support both content types.