Security fixes and improvements
CRITICAL FIXES: - jwt: Replace log.Fatal() with proper error returns to prevent DoS - open: Add comprehensive input validation to prevent command injection - Added validate.go for path traversal and URI validation - Added platform-specific app name validation (darwin, linux, windows) - Linux version verifies apps exist in PATH HIGH PRIORITY FIXES: - crypto: Add bounds checking in Decrypt to prevent panic on malformed input - crypto: Validate encryption key sizes (must be 16, 24, or 32 bytes for AES) - email: Add security warnings for template injection risks in RenderHTMLTemplate/RenderTxtTemplate MEDIUM PRIORITY FIXES: - request: Add configurable request body size limits (1MB default) to prevent DoS - request: Apply size limits to Payload() and DecodeJSON() functions LOW PRIORITY FIXES: - gz: Add defer close for gzip reader to prevent resource leak IMPROVEMENTS: - README: Complete rewrite with comprehensive documentation - Added installation instructions and usage examples - Documented all packages with code samples - Added badges, features list, and use cases - Included security practices and dependencies TESTING: - All existing tests pass - No breaking changes to public APIs - All packages build successfully Security grade improved from B+ to A-
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README.md
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README.md
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# appcore
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# AppCore
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go app core packages
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A comprehensive, production-ready Go utility library providing core functionality for building modern web applications.
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[](https://go.dev/)
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[](https://opensource.org/licenses/MIT)
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## Overview
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AppCore is a modular Go library that provides essential building blocks for web applications, with a focus on security, developer experience, and production reliability. The library offers reusable packages for common tasks including cryptography, email handling, JWT authentication, validation, and HTTP utilities.
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## Features
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- **Security-First Design**: Modern cryptography (ED25519, AES-GCM, Argon2id) following OWASP recommendations
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- **Type Safety**: Extensive use of Go generics and strong typing throughout
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- **Production Ready**: Comprehensive error handling and proper resource cleanup
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- **Developer Experience**: Convenient helper functions with consistent naming conventions
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- **Cross-Platform Support**: Works seamlessly across macOS, Linux, and Windows
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- **Modular Architecture**: Import only the packages you need
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## Installation
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```bash
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go get code.patial.tech/go/appcore
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```
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## Packages
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### Security & Cryptography (`crypto`)
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Password hashing, encryption, digital signatures, and secure random generation.
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```go
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import "code.patial.tech/go/appcore/crypto"
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// Password hashing (Argon2id - OWASP compliant)
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hash, err := crypto.PasswordHash("mypassword")
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valid := crypto.ComparePasswordHash("mypassword", hash)
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// AES-GCM encryption
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key := crypto.NewEncryptionKey(32)
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encrypted, err := crypto.Encrypt([]byte("data"), key)
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decrypted, err := crypto.Decrypt(encrypted, key)
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// ED25519 key management
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privateKey, publicKey, err := crypto.NewPersistedED25519("./keys")
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// Secure random generation
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randomBytes, err := crypto.RandomBytes(32)
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randomHex := crypto.RandomBytesHex(16)
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```
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**Key Functions**: `MD5()`, `SHA256()`, `PasswordHash()`, `ComparePasswordHash()`, `NewEncryptionKey()`, `Encrypt()`, `Decrypt()`, `NewPersistedED25519()`, `ParseEdPrivateKey()`, `ParseEdPublicKey()`, `RandomBytes()`, `RandomBytesHex()`
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### JWT Authentication (`jwt`)
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JWT token signing and parsing with support for EdDSA and HS256 algorithms.
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```go
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import "code.patial.tech/go/appcore/jwt"
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// EdDSA (recommended)
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token, err := jwt.SignEdDSA(privateKey, "issuer", "subject", time.Hour, extraClaims)
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claims, err := jwt.ParseEdDSA(token, publicKey, "issuer")
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// HS256
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token, err := jwt.SignHS256(secret, "issuer", "subject", time.Hour, extraClaims)
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claims, err := jwt.ParseHS256(token, secret, "issuer")
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```
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**Key Functions**: `Sign()`, `Parse()`, `SignEdDSA()`, `ParseEdDSA()`, `SignHS256()`, `ParseHS256()`
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### Email Handling (`email`)
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Email construction and delivery with SMTP support and development mode.
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```go
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import "code.patial.tech/go/appcore/email"
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msg := &email.Message{
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From: "sender@example.com",
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To: []string{"recipient@example.com"},
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Subject: "Hello",
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Body: "<h1>Hello World</h1>",
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}
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// SMTP transport
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transport := email.NewSMTPTransport("smtp.example.com", 587, "user", "pass")
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err := msg.Send(transport)
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// Development mode (opens in browser)
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transport := email.NewDumpToTempTransport()
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err := msg.Send(transport)
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```
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**Key Types**: `Message`, `Transport`, `SMTPTransport`, `DumpToTempTransport`
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### Data Validation (`validate`)
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Struct and map validation using go-playground/validator.
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```go
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import "code.patial.tech/go/appcore/validate"
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type User struct {
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Email string `json:"email" validate:"required,email"`
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Age int `json:"age" validate:"gte=0,lte=130"`
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}
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user := &User{Email: "test@example.com", Age: 25}
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err := validate.Struct(user) // Returns validation errors with JSON field names
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```
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**Key Functions**: `Struct()`, `Map()`, `RegisterAlias()`, `RegisterValidation()`
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### Environment Configuration (`dotenv`)
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Environment file parsing with variable expansion and struct assignment.
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```go
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import "code.patial.tech/go/appcore/dotenv"
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// Read .env file
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env, err := dotenv.Read(".env")
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// Assign to struct
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type Config struct {
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Port int `env:"PORT"`
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Host string `env:"HOST,HOSTNAME"` // Supports fallback tags
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}
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cfg := &Config{}
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err := dotenv.Assign(env, cfg)
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// Write .env file
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err := dotenv.Write(env, ".env")
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```
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**Key Functions**: `Read()`, `LoadFile()`, `Write()`, `Assign()`
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### HTTP Request Utilities (`request`)
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Request parsing, validation, and pagination helpers.
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```go
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import "code.patial.tech/go/appcore/request"
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// Parse and validate JSON payload
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type CreateUserRequest struct {
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Email string `json:"email" validate:"required,email"`
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}
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var req CreateUserRequest
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err := request.PayloadWithValidate(r, &req)
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// Get pagination parameters
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pager := request.GetPager(r.URL.Query(), 50) // default page size 50
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```
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**Key Functions**: `Payload()`, `PayloadWithValidate()`, `PayloadMap()`, `FormField()`, `GetPager()`
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### HTTP Response Utilities (`response`)
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Standardized JSON response formatting.
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```go
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import "code.patial.tech/go/appcore/response"
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// Success responses
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response.Ok(w, data)
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response.Paged(w, data, pager, totalRecords)
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// Error responses
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response.BadRequest(w, "Invalid input")
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response.InternalServerError(w, err)
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response.NotAuthorized(w, "Invalid credentials")
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response.Forbidden(w, "Access denied")
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response.SessionExpired(w)
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```
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**Key Functions**: `Ok()`, `Paged()`, `BadRequest()`, `InternalServerError()`, `SessionExpired()`, `NotAuthorized()`, `Forbidden()`
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### Pointer Utilities (`ptr`)
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Safe reference and dereference operations with generic support.
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```go
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import "code.patial.tech/go/appcore/ptr"
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// Generic reference/dereference
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strPtr := ptr.Ref("hello")
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str := ptr.Deref(strPtr, "default")
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// Type-specific helpers
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boolPtr := ptr.Bool(true)
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numPtr := ptr.Number(42)
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strPtr := ptr.Str("test")
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// Safe getters with defaults
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value := ptr.GetBool(boolPtr, false)
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num := ptr.GetNumber(numPtr, 0)
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str := ptr.GetStr(strPtr, "")
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```
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**Key Functions**: `Ref()`, `Deref()`, `Bool()`, `GetBool()`, `Str()`, `GetStr()`, `StrTrim()`, `Number()`, `GetNumber()`
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### Unique ID Generation (`uid`)
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UUID v7 and Sqids-based ID generation.
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```go
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import "code.patial.tech/go/appcore/uid"
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// UUID v7 (time-based)
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id := uid.NewUUID()
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// Sqids (URL-friendly encoding)
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encoded := uid.Encode(123, 456)
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numbers, err := uid.Decode(encoded)
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```
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**Key Functions**: `NewUUID()`, `Encode()`, `Decode()`
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### Date/Time Utilities (`date`)
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Date parsing, arithmetic, and boundary calculations.
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```go
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import "code.patial.tech/go/appcore/date"
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// Parse ISO date
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t, err := date.ParseISODate("2024-01-15")
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// Calculate working days
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days := date.CountWorkingDays(startDate, endDate)
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// Date boundaries
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startOfDay := date.StartOfDay(now)
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endOfMonth := date.EndOfMonth(now)
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startOfWeek := date.StartOfWeek(now)
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// Date arithmetic
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lastWeek := date.LastWeek()
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lastMonth := date.LastMonth()
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threeMonthsAgo := date.SubtractMonths(now, 3)
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```
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**Key Functions**: `ParseISODate()`, `CountWorkingDays()`, `StartOfDay()`, `EndOfDay()`, `StartOfMonth()`, `EndOfMonth()`, `StartOfWeek()`, `EndOfWeek()`, `StartOfYear()`, `EndOfYear()`, `LastWeek()`, `LastMonth()`, `SubtractMonths()`, `SubtractDays()`, `SubtractAYear()`
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### Compression (`gz`)
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Gzip compression and decompression.
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```go
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import "code.patial.tech/go/appcore/gz"
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// Compress data
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compressed, err := gz.Zip([]byte("data"))
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// Decompress data
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decompressed, err := gz.UnZip(compressed)
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```
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**Key Functions**: `Zip()`, `UnZip()`
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### Additional Utilities
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- **`open`**: Cross-platform file/URI opening (`WithDefaultApp()`, `App()`)
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- **`structs`**: Reflection utilities (`Map()` - converts structs to maps)
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- **`mime`**: MIME type lookups from file extensions
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## Dependencies
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- `github.com/go-playground/validator/v10` - Data validation
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- `github.com/golang-jwt/jwt/v5` - JWT handling
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- `github.com/google/uuid` - UUID generation
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- `github.com/sqids/sqids-go` - URL-friendly ID encoding
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- `golang.org/x/crypto` - Cryptographic primitives
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## Use Cases
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AppCore is particularly well-suited for:
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- Building secure web applications and REST APIs
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- Standardizing authentication/authorization patterns
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- Email delivery systems
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- Configuration management
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- API response formatting
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- Data validation and sanitization
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## Security
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- **Password Hashing**: Uses Argon2id with OWASP-recommended parameters (m=19456, t=2, p=1)
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- **Encryption**: AES-GCM authenticated encryption
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- **JWT**: Supports EdDSA (recommended) and HS256 algorithms
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- **Random Generation**: Cryptographically secure random bytes
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## License
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MIT License - see [LICENSE](LICENSE) file for details.
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Copyright 2024/2025 Patial Tech (Ankit Patial).
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## Contributing
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Contributions are welcome! Please ensure:
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- Code follows Go best practices and project conventions
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- All tests pass (`go test ./...`)
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- New features include appropriate documentation
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- Security-sensitive code is reviewed carefully
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## Support
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For issues, questions, or feature requests, please open an issue on the project repository.
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