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Add SHA-256-based hashcash proof-of-work requirement to POST /session to prevent abuse via rapid session creation. The server advertises the required difficulty via GET /server (hashcash_bits field), and clients must include a valid stamp in the X-Hashcash request header. Server-side: - New internal/hashcash package with stamp validation (format, bits, date, resource, replay prevention via in-memory spent set) - Config: NEOIRC_HASHCASH_BITS env var (default 20, set 0 to disable) - GET /server includes hashcash_bits when > 0 - POST /session validates X-Hashcash header when enabled - Returns HTTP 402 for missing/invalid stamps Client-side: - SPA: fetches hashcash_bits from /server, computes stamp using Web Crypto API with batched SHA-256, shows 'Computing proof-of-work...' feedback during computation - CLI: api package gains MintHashcash() function, CreateSession() auto-fetches server info and computes stamp when required Stamp format: 1:bits:YYMMDD:resource::counter (standard hashcash) closes #11
115 lines
3.2 KiB
Go
115 lines
3.2 KiB
Go
// Package config provides application configuration via environment and files.
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package config
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import (
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"errors"
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"log/slog"
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"git.eeqj.de/sneak/neoirc/internal/globals"
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"git.eeqj.de/sneak/neoirc/internal/logger"
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"github.com/spf13/viper"
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"go.uber.org/fx"
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_ "github.com/joho/godotenv/autoload" // loads .env file
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)
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const defaultMOTD = ` _ __ ___ ___ (_)_ __ ___
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| '_ \ / _ \/ _ \ | | '__/ __|
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| | | | __/ (_) || | | | (__
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|_| |_|\___|\___/ |_|_| \___|
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Welcome to NeoIRC — IRC semantics over HTTP.
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Type /help for available commands.`
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// Params defines the dependencies for creating a Config.
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type Params struct {
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fx.In
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Globals *globals.Globals
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Logger *logger.Logger
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}
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// Config holds all application configuration values.
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type Config struct {
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DBURL string
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Debug bool
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MaintenanceMode bool
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MetricsPassword string
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MetricsUsername string
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Port int
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SentryDSN string
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MaxHistory int
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MaxMessageSize int
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MOTD string
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ServerName string
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FederationKey string
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SessionIdleTimeout string
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HashcashBits int
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params *Params
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log *slog.Logger
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}
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// New creates a new Config by reading from files and environment variables.
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func New(
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_ fx.Lifecycle, params Params,
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) (*Config, error) {
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log := params.Logger.Get()
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name := params.Globals.Appname
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viper.SetConfigName(name)
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viper.SetConfigType("yaml")
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viper.AddConfigPath("/etc/" + name)
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viper.AddConfigPath("$HOME/.config/" + name)
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viper.AutomaticEnv()
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viper.SetDefault("DEBUG", "false")
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viper.SetDefault("MAINTENANCE_MODE", "false")
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viper.SetDefault("PORT", "8080")
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viper.SetDefault("DBURL", "file:///var/lib/neoirc/state.db?_journal_mode=WAL")
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viper.SetDefault("SENTRY_DSN", "")
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viper.SetDefault("METRICS_USERNAME", "")
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viper.SetDefault("METRICS_PASSWORD", "")
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viper.SetDefault("MAX_HISTORY", "10000")
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viper.SetDefault("MAX_MESSAGE_SIZE", "4096")
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viper.SetDefault("MOTD", defaultMOTD)
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viper.SetDefault("SERVER_NAME", "")
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viper.SetDefault("FEDERATION_KEY", "")
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viper.SetDefault("SESSION_IDLE_TIMEOUT", "24h")
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viper.SetDefault("NEOIRC_HASHCASH_BITS", "20")
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err := viper.ReadInConfig()
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if err != nil {
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var notFound viper.ConfigFileNotFoundError
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if !errors.As(err, ¬Found) {
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log.Error("config file malformed", "error", err)
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panic(err)
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}
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}
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cfg := &Config{
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DBURL: viper.GetString("DBURL"),
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Debug: viper.GetBool("DEBUG"),
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Port: viper.GetInt("PORT"),
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SentryDSN: viper.GetString("SENTRY_DSN"),
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MaintenanceMode: viper.GetBool("MAINTENANCE_MODE"),
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MetricsUsername: viper.GetString("METRICS_USERNAME"),
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MetricsPassword: viper.GetString("METRICS_PASSWORD"),
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MaxHistory: viper.GetInt("MAX_HISTORY"),
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MaxMessageSize: viper.GetInt("MAX_MESSAGE_SIZE"),
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MOTD: viper.GetString("MOTD"),
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ServerName: viper.GetString("SERVER_NAME"),
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FederationKey: viper.GetString("FEDERATION_KEY"),
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SessionIdleTimeout: viper.GetString("SESSION_IDLE_TIMEOUT"),
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HashcashBits: viper.GetInt("NEOIRC_HASHCASH_BITS"),
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log: log,
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params: ¶ms,
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}
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if cfg.Debug {
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params.Logger.EnableDebugLogging()
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cfg.log = params.Logger.Get()
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}
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return cfg, nil
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}
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