OpenID Connect กับ Developer Experience DX —

OpenID Connect

OpenID Connect OIDC Identity Layer บน OAuth 2.0 Authentication ยืนยันตัวตน ID Token JWT SSO Single Sign-On Google GitHub Microsoft Login

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OIDC Authentication Flow

# oidc_auth.py — OpenID Connect Authentication
# pip install authlib httpx pyjwt cryptography

from dataclasses import dataclass, field
from typing import Dict, Optional, List
import hashlib
import base64
import secrets
import json
import time

@dataclass
class OIDCConfig:
    issuer: str
    client_id: str
    client_secret: str
    redirect_uri: str
    scopes: List[str] = field(default_factory=lambda: ["openid", "profile", "email"])
    authorization_endpoint: str = ""
    token_endpoint: str = ""
    userinfo_endpoint: str = ""
    jwks_uri: str = ""

    def __post_init__(self):
        if not self.authorization_endpoint:
            self.authorization_endpoint = f"{self.issuer}/authorize"
        if not self.token_endpoint:
            self.token_endpoint = f"{self.issuer}/oauth/token"
        if not self.userinfo_endpoint:
            self.userinfo_endpoint = f"{self.issuer}/userinfo"
        if not self.jwks_uri:
            self.jwks_uri = f"{self.issuer}/.well-known/jwks.json"

class OIDCClient:
    """OIDC Client with PKCE Support"""

    def __init__(self, config: OIDCConfig):
        self.config = config

    def generate_pkce(self) -> Dict[str, str]:
        """Generate PKCE Code Verifier and Challenge"""
        verifier = secrets.token_urlsafe(43)
        challenge = base64.urlsafe_b64encode(
            hashlib.sha256(verifier.encode()).digest()
        ).rstrip(b"=").decode()
        return {"verifier": verifier, "challenge": challenge}

    def get_authorization_url(self, state: str = "") -> Dict[str, str]:
        """สร้าง Authorization URL"""
        if not state:
            state = secrets.token_urlsafe(32)
        pkce = self.generate_pkce()

        params = {
            "response_type": "code",
            "client_id": self.config.client_id,
            "redirect_uri": self.config.redirect_uri,
            "scope": " ".join(self.config.scopes),
            "state": state,
            "code_challenge": pkce["challenge"],
            "code_challenge_method": "S256",
        }

        query = "&".join(f"{k}={v}" for k, v in params.items())
        url = f"{self.config.authorization_endpoint}?{query}"

        return {
            "url": url,
            "state": state,
            "code_verifier": pkce["verifier"],
        }

    def exchange_code(self, code: str, code_verifier: str) -> dict:
        """แลก Authorization Code เป็น Tokens"""
        # payload = {
        #     "grant_type": "authorization_code",
        #     "code": code,
        #     "redirect_uri": self.config.redirect_uri,
        #     "client_id": self.config.client_id,
        #     "client_secret": self.config.client_secret,
        #     "code_verifier": code_verifier,
        # }
        # response = httpx.post(self.config.token_endpoint, data=payload)
        # return response.json()

        return {
            "access_token": "eyJhbGciOiJSUzI1NiJ9...",
            "id_token": "eyJhbGciOiJSUzI1NiJ9...",
            "refresh_token": "dGhpcyBpcyBhIHJlZnJlc2g...",
            "token_type": "Bearer",
            "expires_in": 3600,
        }

    def refresh_token(self, refresh_token: str) -> dict:
        """Refresh Access Token"""
        print(f"  Refreshing token...")
        return {"access_token": "new_token...", "expires_in": 3600}

# ตัวอย่าง
config = OIDCConfig(
    issuer="https://auth.example.com",
    client_id="my-app-client-id",
    client_secret="my-app-client-secret",
    redirect_uri="http://localhost:3000/callback",
)

client = OIDCClient(config)

# OIDC Flows
flows = {
    "Authorization Code + PKCE": {
        "use": "Web App, SPA, Mobile App",
        "security": "สูงสุด",
        "steps": "1.Auth URL -> 2.User Login -> 3.Callback Code -> 4.Exchange Token",
    },
    "Client Credentials": {
        "use": "Machine-to-Machine, API-to-API",
        "security": "สูง",
        "steps": "1.Send Client ID+Secret -> 2.Get Access Token",
    },
    "Device Authorization": {
        "use": "Smart TV, CLI, IoT",
        "security": "สูง",
        "steps": "1.Get Device Code -> 2.User Login on Browser -> 3.Poll for Token",
    },
}

print("OIDC Authentication Flows:")
for flow, info in flows.items():
    print(f"\n  [{flow}]")
    for key, value in info.items():
        print(f"    {key}: {value}")

auth = client.get_authorization_url()
print(f"\n  Auth URL: {auth['url'][:80]}...")
print(f"  State: {auth['state'][:20]}...")

Developer Experience SDK

# dx_sdk.py — Developer Experience SDK Design
from dataclasses import dataclass
from typing import Dict, Optional, Callable
import time

@dataclass
class SDKConfig:
    api_key: str
    base_url: str = "https://api.example.com"
    timeout: int = 30
    retry_count: int = 3
    auto_refresh: bool = True

class DeveloperSDK:
    """SDK ที่ออกแบบเพื่อ Developer Experience ที่ดี"""

    def __init__(self, config: SDKConfig):
        self.config = config
        self._access_token: Optional[str] = None
        self._token_expiry: float = 0

    def _ensure_auth(self):
        """Auto-refresh token (ไม่ต้อง Handle เอง)"""
        if time.time() >= self._token_expiry:
            self._refresh_token()

    def _refresh_token(self):
        """Refresh token อัตโนมัติ"""
        self._access_token = "refreshed_token"
        self._token_expiry = time.time() + 3600
        print("  [SDK] Token refreshed automatically")

    def _request(self, method: str, path: str, **kwargs) -> dict:
        """HTTP Request พร้อม Auto-retry และ Error Handling"""
        self._ensure_auth()

        for attempt in range(self.config.retry_count):
            try:
                # response = httpx.request(
                #     method, f"{self.config.base_url}{path}",
                #     headers={"Authorization": f"Bearer {self._access_token}"},
                #     timeout=self.config.timeout,
                #     **kwargs
                # )
                # response.raise_for_status()
                # return response.json()
                return {"status": "ok", "data": {}}
            except Exception as e:
                if attempt == self.config.retry_count - 1:
                    raise
                time.sleep(2 ** attempt)

    # DX-friendly API Methods
    def get_user(self, user_id: str) -> dict:
        """ดึงข้อมูลผู้ใช้"""
        return self._request("GET", f"/users/{user_id}")

    def list_users(self, page: int = 1, limit: int = 20) -> dict:
        """ดึงรายชื่อผู้ใช้"""
        return self._request("GET", "/users", params={"page": page, "limit": limit})

    def create_user(self, email: str, name: str, **kwargs) -> dict:
        """สร้างผู้ใช้ใหม่"""
        return self._request("POST", "/users", json={"email": email, "name": name, **kwargs})

# DX Best Practices
dx_practices = {
    "Quick Start": {
        "goal": "First API Call ภายใน 5 นาที",
        "how": "3 บรรทัด: Install -> Config -> Call",
        "example": "sdk = SDK(api_key='xxx'); sdk.get_user('123')",
    },
    "Auto Auth": {
        "goal": "ไม่ต้อง Handle Token เอง",
        "how": "SDK จัดการ Token Refresh อัตโนมัติ",
        "example": "ใส่ API Key ครั้งเดียว ใช้ได้ตลอด",
    },
    "Clear Errors": {
        "goal": "Error Messages เข้าใจง่าย",
        "how": "บอกสาเหตุ + วิธีแก้ + Link Docs",
        "example": "AuthError: API key expired. Refresh at dashboard.example.com/keys",
    },
    "Type Safety": {
        "goal": "IDE Autocomplete ทำงานได้",
        "how": "TypeScript Types, Python Type Hints",
        "example": "Response มี Type ชัดเจน ไม่ต้องเดา",
    },
    "Pagination": {
        "goal": "ใช้ Pagination ง่าย",
        "how": "Iterator Pattern หรือ cursor-based",
        "example": "for user in sdk.list_users(): ...",
    },
}

print("Developer Experience Best Practices:")
for practice, info in dx_practices.items():
    print(f"\n  [{practice}]")
    print(f"    Goal: {info['goal']}")
    print(f"    How: {info['how']}")
    print(f"    Example: {info['example']}")

Developer Portal

# dev_portal.py — Developer Portal Components
portal_components = {
    "Documentation": {
        "tools": "Mintlify, Docusaurus, ReadMe.io",
        "must_have": "Quick Start, API Reference, Guides, FAQ",
        "dx_tip": "ทุกหน้ามี Code Example Copy-paste ได้",
    },
    "API Playground": {
        "tools": "Swagger UI, Stoplight, Custom React",
        "must_have": "Interactive API Testing, Auth Built-in",
        "dx_tip": "ทดสอบ API ได้ทันทีไม่ต้องเขียนโค้ด",
    },
    "Dashboard": {
        "tools": "Custom Next.js + Shadcn UI",
        "must_have": "API Keys, Usage Stats, Billing, Logs",
        "dx_tip": "สร้าง API Key ได้ทันที ดู Usage Real-time",
    },
    "SDKs": {
        "tools": "OpenAPI Generator, Stainless, Fern",
        "must_have": "Python, JavaScript, Go, Java, Ruby",
        "dx_tip": "Auto-generate จาก OpenAPI Spec ทุกภาษา",
    },
    "Changelog": {
        "tools": "GitHub Releases, Headway, LaunchNotes",
        "must_have": "Breaking Changes, New Features, Fixes",
        "dx_tip": "แจ้ง Breaking Changes ล่วงหน้า Migration Guide",
    },
    "Status Page": {
        "tools": "Statuspage, Instatus, Upptime",
        "must_have": "Uptime, Incidents, Maintenance",
        "dx_tip": "แจ้ง Incident ทันที Transparent",
    },
}

print("Developer Portal Components:")
for component, info in portal_components.items():
    print(f"\n  [{component}]")
    for key, value in info.items():
        print(f"    {key}: {value}")

# DX Metrics
metrics = {
    "TTFHW": "Time to First Hello World — เวลาที่ Dev ใช้ทำ First API Call",
    "TTFC": "Time to First Commit — เวลาจาก Signup ถึง Commit Code จริง",
    "API Error Rate": "อัตรา Error ที่ Dev พบ ควรต่ำกว่า 1%",
    "Doc Bounce Rate": "อัตราที่ Dev ออกจาก Docs ทันที ควรต่ำ",
    "Support Ticket Rate": "จำนวน Support Tickets ต่อ Developer ควรลดลง",
    "NPS (Net Promoter Score)": "Dev แนะนำ API ให้คนอื่นไหม ควรมากกว่า 40",
}

print(f"\n\nDX Metrics:")
for metric, desc in metrics.items():
    print(f"  {metric}")
    print(f"    {desc}")