Frappe External API Connector

Generate robust API client code for integrating Frappe with external REST APIs, handling authentication, error recovery, and data transformation.

When to Use This Skill

Claude should invoke this skill when:

• User wants to integrate external REST APIs
• User needs to call third-party services
• User mentions API integration, external system connection
• User wants to integrate payment gateways, shipping APIs, etc.
• User needs OAuth or API key authentication

Capabilities

1. API Client Class

REST API Client Template:

import requests
import frappe
from frappe import _

class ExternalAPIClient:
    def __init__(self):
        self.base_url = frappe.conf.get('external_api_url')
        self.api_key = frappe.conf.get('external_api_key')
        self.timeout = 30

    def get_headers(self):
        return {
            'Authorization': f'Bearer {self.api_key}',
            'Content-Type': 'application/json',
            'User-Agent': 'Frappe/1.0'
        }

    def get(self, endpoint, params=None):
        """GET request with error handling"""
        try:
            response = requests.get(
                f'{self.base_url}/{endpoint}',
                params=params,
                headers=self.get_headers(),
                timeout=self.timeout
            )
            response.raise_for_status()
            return response.json()
        except requests.exceptions.Timeout:
            frappe.throw(_('Request timeout'))
        except requests.exceptions.HTTPError as e:
            self._handle_http_error(e)
        except Exception as e:
            frappe.log_error(frappe.get_traceback(),
                'External API Error')
            frappe.throw(_('API request failed'))

    def post(self, endpoint, data):
        """POST request"""
        response = requests.post(
            f'{self.base_url}/{endpoint}',
            json=data,
            headers=self.get_headers(),
            timeout=self.timeout
        )
        response.raise_for_status()
        return response.json()

    def _handle_http_error(self, error):
        """Handle HTTP errors"""
        status_code = error.response.status_code
        if status_code == 401:
            frappe.throw(_('API authentication failed'))
        elif status_code == 404:
            frappe.throw(_('Resource not found'))
        elif status_code == 429:
            frappe.throw(_('Rate limit exceeded'))
        else:
            frappe.throw(_(f'API error: {status_code}'))

2. OAuth Integration

OAuth 2.0 Flow:

def get_oauth_token():
    """Get OAuth access token with refresh"""
    # Check cache first
    token = frappe.cache().get_value('oauth_token:provider')
    if token:
        return token

    # Get from settings
    settings = frappe.get_single('OAuth Settings')

    response = requests.post(
        settings.token_url,
        data={
            'grant_type': 'client_credentials',
            'client_id': settings.client_id,
            'client_secret': settings.get_password('client_secret')
        }
    )

    if response.status_code == 200:
        token_data = response.json()
        access_token = token_data['access_token']

        # Cache token
        frappe.cache().set_value(
            'oauth_token:provider',
            access_token,
            expires_in_sec=token_data.get('expires_in', 3600) - 60
        )

        return access_token

    frappe.throw(_('OAuth authentication failed'))

References

Frappe Integration Patterns:

• Integrations: https://github.com/frappe/frappe/tree/develop/frappe/integrations
• ERPNext Integrations: https://github.com/frappe/erpnext/tree/develop/erpnext/erpnext_integrations