config.go

package main

import (
	"encoding/json"
	"fmt"
	"os"
)

// Config holds everything the scraper needs for one run. Values that identify the
// browser (UserAgent / SecChUa / Platform) MUST stay internally consistent — the
// reese84 sensor, the client hints and the TLS fingerprint all have to agree.
type Config struct {
	// Hyper Solutions API key (https://hypersolutions.co/keys).
	HyperAPIKey string
	// Sticky/session proxy in the form http://user:pass@host:port. The SAME IP must be
	// used for every target request AND reported to the Hyper API — never rotating.
	ProxyURL string

	// Browser identity — taken verbatim from the recorded session.
	UserAgent       string
	SecChUa         string
	SecChUaPlatform string
	AcceptLanguage  string

	// Search parameters.
	Search SearchParams
}

// SearchParams describes one air-bounds availability search.
type SearchParams struct {
	Origin        string // e.g. "CDG"
	Destination   string // e.g. "ICN"
	DepartureDate string // "2006-01-02"
	OriginCountry string // e.g. "FR" — used in the OAuth "fact" blob
	Market        string // e.g. "AU"
	Flow          string // "AWARD" (miles) or "REVENUE" (cash)
	Adults        int
	FareFamilies  []string // e.g. ["ECONOMY","BUSINESS"]
}

// LoadConfig builds a Config from environment variables, falling back to the values
// captured in the recorded browser session so the program is runnable out of the box.
func LoadConfig() (*Config, error) {
	key := os.Getenv("HYPER_API_KEY")
	if key == "" {
		return nil, fmt.Errorf("HYPER_API_KEY is required (get one at https://hypersolutions.co/keys)")
	}

	cfg := &Config{
		HyperAPIKey: key,
		ProxyURL:    os.Getenv("PROXY_URL"),

		// Chrome 150 on Windows — matches the recorded session. Keep these three in sync
		// with each other and with the TLS profile in tlsclient.go.
		UserAgent:       "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36",
		SecChUa:         `"Not;A=Brand";v="8", "Chromium";v="150", "Google Chrome";v="150"`,
		SecChUaPlatform: `"Windows"`,
		AcceptLanguage:  "en-US,en;q=0.9",

		Search: SearchParams{
			Origin:        envOr("EY_ORIGIN", "CDG"),
			Destination:   envOr("EY_DEST", "ICN"),
			DepartureDate: envOr("EY_DATE", "2026-07-17"),
			OriginCountry: envOr("EY_ORIGIN_COUNTRY", "FR"),
			Market:        envOr("EY_MARKET", "AU"),
			Flow:          envOr("EY_FLOW", "AWARD"),
			Adults:        1,
			FareFamilies:  []string{"ECONOMY", "BUSINESS"},
		},
	}
	return cfg, nil
}

func envOr(key, def string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return def
}

func mustJSON(v any) string {
	b, err := json.Marshal(v)
	if err != nil {
		panic(err)
	}
	return string(b)
}