Add S3 configuration and presigned URL logic for file upload and download

app/internal/svc/servicecontext.go

@@ -1,15 +1,80 @@
 package svc
 
 import (
+	"context"
+	"database/sql"
+
 	"git.cialloo.com/CiallooWeb/Blog/app/internal/config"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsconfig "github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/credentials"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	_ "github.com/lib/pq"
 )
 
 type ServiceContext struct {
-	Config config.Config
+	Config   config.Config
+	S3Client *s3.Client
+	DB       *sql.DB
 }
 
 func NewServiceContext(c config.Config) *ServiceContext {
 	return &ServiceContext{
-		Config: c,
+		Config:   c,
+		S3Client: initS3Client(c.S3),
+		DB:       initDatabase(c.Database),
 	}
 }
+
+func initDatabase(dbConfig config.DatabaseConfig) *sql.DB {
+	db, err := sql.Open("postgres", dbConfig.DSN)
+	if err != nil {
+		panic(err)
+	}
+
+	// Verify connection
+	if err := db.Ping(); err != nil {
+		panic(err)
+	}
+
+	return db
+}
+
+func initS3Client(s3Config config.S3Config) *s3.Client {
+	var cfg aws.Config
+	var err error
+
+	if s3Config.Endpoint != "" {
+		// Custom endpoint (e.g., MinIO)
+		cfg, err = awsconfig.LoadDefaultConfig(context.Background(),
+			awsconfig.WithRegion(s3Config.Region),
+			awsconfig.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
+				s3Config.AccessKeyID,
+				s3Config.SecretAccessKey,
+				"",
+			)),
+		)
+		if err != nil {
+			panic(err)
+		}
+		return s3.NewFromConfig(cfg, func(o *s3.Options) {
+			o.BaseEndpoint = aws.String(s3Config.Endpoint)
+			o.UsePathStyle = true
+		})
+	}
+
+	// Standard AWS S3
+	cfg, err = awsconfig.LoadDefaultConfig(context.Background(),
+		awsconfig.WithRegion(s3Config.Region),
+		awsconfig.WithCredentialsProvider(credentials.NewStaticCredentialsProvider(
+			s3Config.AccessKeyID,
+			s3Config.SecretAccessKey,
+			"",
+		)),
+	)
+	if err != nil {
+		panic(err)
+	}
+
+	return s3.NewFromConfig(cfg)
+}