discourse/backend/cmd/api/main.go

package main

import (
	"fmt"
	"log"
	"math/big"
	"net/http"
	"os"

	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/blockchain"
	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/feedback"
	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/identity"
	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/ipfs"
	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/moderation"
	"4vif5i.gitea.cloud/numenor-labs/discourse/backend/perspective"
	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/ethclient"
	"github.com/gin-gonic/gin"
	"github.com/go-redis/redis/v8"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)

var (
	rpcURL          = os.Getenv("RPC_URL")
	contractAddress = os.Getenv("CONTRACT_ADDRESS")
	privateKey      = os.Getenv("PRIVATE_KEY")
	redisAddr       = getEnv("REDIS_ADDR", "localhost:6379")
	redisPassword   = getEnv("REDIS_PASSWORD", "")
	redisDB         = 0
	dbDSN           = getEnv("DATABASE_URL", "postgres://postgres:postgres@localhost:5432/voxpop?sslmode=disable")
)

// getEnv gets an environment variable or returns a default value
func getEnv(key, defaultValue string) string {
	value := os.Getenv(key)
	if value == "" {
		return defaultValue
	}
	return value
}

func main() {
	// Connect to Sepolia
	client, err := ethclient.Dial(rpcURL)
	if err != nil {
		log.Fatalf("Failed to connect to Ethereum client: %v", err)
	}

	// Connect to Redis
	redisClient := redis.NewClient(&redis.Options{
		Addr:     redisAddr,
		Password: redisPassword,
		DB:       redisDB,
	})

	// Connect to PostgreSQL
	db, err := gorm.Open(postgres.Open(dbDSN), &gorm.Config{})
	if err != nil {
		log.Fatalf("Failed to connect to database: %v", err)
	}
	log.Println("Connected to PostgreSQL database")

	// Set up HTTP server
	router := gin.Default()

	// Initialize the verification handler
	verificationHandler := identity.NewVerificationHandler()

	// Register the verification routes
	verificationHandler.RegisterRoutes(router)

	// Initialize the IPFS service (or use mock for development)
	var ipfsService perspective.IPFSServiceInterface
	pinataProd := os.Getenv("PINATA_PRODUCTION")
	if pinataProd == "true" {
		ipfsServiceReal, err := ipfs.NewIPFSService()
		if err != nil {
			log.Printf("Warning: Failed to initialize Pinata IPFS service: %v", err)
			log.Println("Falling back to mock IPFS service")
			ipfsService = ipfs.NewMockIPFSService()
		} else {
			ipfsService = ipfsServiceReal
			log.Println("Initialized Pinata IPFS service")
		}
	} else {
		ipfsService = ipfs.NewMockIPFSService()
		log.Println("Using mock IPFS service")
	}

	// Initialize the perspective service and handler
	perspectiveService := perspective.NewPerspectiveService(redisClient, db, ipfsService)
	perspectiveHandler := perspective.NewPerspectiveHandler(perspectiveService)

	// Register the perspective routes
	perspectiveHandler.RegisterRoutes(router)

	// Initialize the moderation service and handler
	moderationService := moderation.NewModerationService(db)
	moderationHandler := moderation.NewModerationHandler(moderationService)

	// Register the moderation routes
	moderationHandler.RegisterRoutes(router)

	// Initialize the blockchain service and handler
	blockchainService, err := blockchain.NewBlockchainService()
	if err != nil {
		log.Fatalf("Failed to initialize blockchain service: %v", err)
	}
	defer blockchainService.Close()

	blockchainHandler := blockchain.NewHandler(blockchainService)

	// Register the blockchain routes
	blockchainHandler.RegisterRoutes(router)

	// Existing feedback submission endpoint
	router.OPTIONS(
		"/submit-feedback", func(c *gin.Context) {
			c.Header("Access-Control-Allow-Origin", "*")
			c.Header("Access-Control-Allow-Methods", "POST, OPTIONS")
			c.Header("Access-Control-Allow-Headers", "Content-Type")
			c.Status(http.StatusOK)
		},
	)
	router.POST(
		"/submit-feedback", func(c *gin.Context) {
			c.Header("Access-Control-Allow-Origin", "*")
			c.Header("Access-Control-Allow-Methods", "POST, OPTIONS")
			c.Header("Access-Control-Allow-Headers", "Content-Type")
			var request struct {
				Proof    string `json:"proof"`
				Feedback string `json:"feedback"`
			}
			if err := c.BindJSON(&request); err != nil {
				c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request"})
				return
			}

			// Mocked ZKP verification
			if request.Proof != "valid_proof" {
				c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid proof"})
				return
			}

			privateKeyECDSA, err := crypto.HexToECDSA(privateKey)
			if err != nil {
				fmt.Println("Failed to parse private key:", err)
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to parse private key"})
				return
			}

			// Create the transactor (chain ID 11155111 is for Sepolia testnet, adjust as needed)
			auth, err := bind.NewKeyedTransactorWithChainID(privateKeyECDSA, big.NewInt(11155111))
			if err != nil {
				log.Fatalf("Failed to create transactor: %v", err)
			}

			// Instantiate the contract
			contract, err := feedback.NewFeedback(common.HexToAddress(contractAddress), client)
			if err != nil {
				fmt.Println("Failed to instantiate contract:", err)
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to instantiate contract"})
				return
			}

			// Submit feedback to blockchain
			tx, err := contract.SubmitFeedback(auth, request.Feedback)
			if err != nil {
				fmt.Println("Failed to submit feedback:", err)
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to submit feedback"})
				return
			}

			fmt.Println("Submitted feedback:", tx.Hash().Hex())
			c.JSON(http.StatusOK, gin.H{"transaction": tx.Hash().Hex()})
		},
	)

	log.Println("Server running on :3000")
	router.Run(":3000")
}