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* Base platform handler interface and common functionality\n * All platform handlers extend this base class\n */\n\nimport type { \n NormalizedMessage, \n PlatformMessage, \n PlatformResponse, \n Platform,\n WebhookValidation \n} from '../../shared/types.ts';\nimport { generateId, generateConversationId, generateUserId } from '../../shared/utils.ts';\nimport { SystemLogQueries } from '../database/queries.ts';\n\nexport abstract class BasePlatformHandler {\n protected platform: Platform;\n \n constructor(platform: Platform) {\n this.platform = platform;\n }\n \n /**\n * Normalize incoming platform message to internal format\n * Must be implemented by each platform handler\n */\n abstract normalizeMessage(payload: any): Promise;\n \n /**\n * Send response back to platform\n * Must be implemented by each platform handler\n */\n abstract sendMessage(conversationId: string, content: string, metadata?: any): Promise;\n \n /**\n * Validate webhook signature and payload\n * Must be implemented by each platform handler\n */\n abstract validateWebhook(payload: any, signature: string): boolean;\n \n /**\n * Handle platform-specific authentication\n * Can be overridden by platform handlers if needed\n */\n async authenticate(): Promise {\n // Default implementation - check for required environment variables\n const requiredEnvVars = this.getRequiredEnvVars();\n \n for (const envVar of requiredEnvVars) {\n if (!Deno.env.get(envVar)) {\n await SystemLogQueries.log(\n 'error',\n `platform-${this.platform}`,\n `Missing required environment variable: ${envVar}`\n );\n return false;\n }\n }\n \n return true;\n }\n \n /**\n * Get required environment variables for this platform\n * Should be overridden by each platform handler\n */\n protected getRequiredEnvVars(): string[] {\n return [];\n }\n \n /**\n * Extract user information from platform payload\n * Helper method for platform handlers\n */\n protected extractUserInfo(payload: any): { id: string; displayName: string } {\n // Default implementation - should be overridden by platform handlers\n return {\n id: generateUserId(this.platform, 'unknown'),\n displayName: 'Unknown User'\n };\n }\n \n /**\n * Extract conversation information from platform payload\n * Helper method for platform handlers\n */\n protected extractConversationInfo(payload: any): { id: string; name?: string } {\n // Default implementation - should be overridden by platform handlers\n return {\n id: generateConversationId(this.platform, 'unknown'),\n name: undefined\n };\n }\n \n /**\n * Check if message should be processed (not from bot, not system message, etc.)\n * Helper method for platform handlers\n */\n protected shouldProcessMessage(payload: any): boolean {\n // Default implementation - should be overridden by platform handlers\n return true;\n }\n \n /**\n * Log platform-specific activity\n */\n protected async logActivity(\n level: 'debug' | 'info' | 'warn' | 'error',\n message: string,\n metadata?: any,\n conversationId?: string,\n userId?: string\n ): Promise {\n await SystemLogQueries.log(\n level,\n `platform-${this.platform}`,\n message,\n metadata,\n conversationId,\n userId\n );\n }\n \n /**\n * Create a normalized message from platform data\n * Helper method for platform handlers\n */\n protected createNormalizedMessage(\n content: string,\n conversationId: string,\n userId: string,\n metadata: any = {}\n ): NormalizedMessage {\n return {\n id: generateId('msg'),\n conversationId,\n userId,\n content: content.trim(),\n timestamp: new Date(),\n platform: this.platform,\n messageType: 'text',\n metadata: {\n ...metadata,\n platform: this.platform,\n originalPayload: metadata.originalPayload || {}\n }\n };\n }\n \n /**\n * Validate common webhook requirements\n * Helper method for platform handlers\n */\n protected validateCommonWebhook(payload: any, signature: string): WebhookValidation {\n if (!payload) {\n return {\n isValid: false,\n platform: this.platform,\n error: 'Empty payload'\n };\n }\n \n if (!signature) {\n return {\n isValid: false,\n platform: this.platform,\n error: 'Missing signature'\n };\n }\n \n return {\n isValid: true,\n platform: this.platform,\n signature,\n timestamp: new Date()\n };\n }\n \n /**\n * Handle rate limiting for platform API calls\n * Helper method for platform handlers\n */\n protected async handleRateLimit(operation: string): Promise {\n // Simple rate limiting implementation\n // In production, this would use a more sophisticated rate limiter\n \n const rateLimitKey = `${this.platform}:${operation}`;\n const now = Date.now();\n \n // For now, just log the operation\n await this.logActivity(\n 'debug',\n `Rate limit check for ${operation}`,\n { rateLimitKey, timestamp: now }\n );\n \n return true; // Allow all operations for now\n }\n \n /**\n * Retry failed API calls with exponential backoff\n * Helper method for platform handlers\n */\n protected async retryOperation(\n operation: () => Promise,\n maxRetries: number = 3,\n baseDelay: number = 1000\n ): Promise {\n let lastError: Error;\n \n for (let attempt = 1; attempt <= maxRetries; attempt++) {\n try {\n return await operation();\n } catch (error) {\n lastError = error as Error;\n \n if (attempt === maxRetries) {\n break;\n }\n \n const delay = baseDelay * Math.pow(2, attempt - 1);\n await this.logActivity(\n 'warn',\n `Operation failed, retrying in ${delay}ms (attempt ${attempt}/${maxRetries})`,\n { error: error.message }\n );\n \n await new Promise(resolve => setTimeout(resolve, delay));\n }\n }\n \n throw lastError!;\n }\n \n /**\n * Format error message for platform response\n * Helper method for platform handlers\n */\n protected formatErrorMessage(error: Error): string {\n // Don't expose internal error details to users\n return \"I'm having trouble processing that message right now. Please try again later.\";\n }\n \n /**\n * Check if content contains mentions of the bot\n * Helper method for platform handlers\n */\n protected containsBotMention(content: string): boolean {\n const botMentions = ['yaptrap', '@yaptrap', 'bot', '@bot'];\n const lowerContent = content.toLowerCase();\n \n return botMentions.some(mention => lowerContent.includes(mention));\n }\n \n /**\n * Clean and sanitize message content\n * Helper method for platform handlers\n */\n protected sanitizeContent(content: string): string {\n return content\n .replace(/[<>]/g, '') // Remove potential HTML tags\n .replace(/javascript:/gi, '') // Remove javascript: protocols\n .trim();\n }\n}","deleted","label",[167,168,149],"backend","platforms","permalink","https://www.val.town/x/lantholin/YapTrap/code/backend/platforms/base.ts","extension","actionData","errors"]