From 09af83576a877eda40512bfba30b47a1b13061fb Mon Sep 17 00:00:00 2001
From: Rutger Broekhoff
Date: Wed, 13 Nov 2024 20:47:40 +0100
Subject: Initial (public) commit

---
 config.go | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 config.go

(limited to 'config.go')

diff --git a/config.go b/config.go
new file mode 100644
index 0000000..d9a2e30
--- /dev/null
+++ b/config.go
@@ -0,0 +1,74 @@
+package main
+
+import (
+	"encoding/base64"
+	"encoding/json"
+	"log"
+	"net/url"
+	"os"
+	"regexp"
+)
+
+type userToken struct {
+	Hash []byte `json:"hash"`
+	Salt []byte `json:"salt"`
+}
+
+type config struct {
+	CalendarURL url.URL              `json:"calendar_url"`
+	Ignore      ignoreRules          `json:"ignore"`
+	Port        string               `json:"port"`
+	UserTokens  map[string]userToken `json:"user_tokens"`
+}
+
+type ignoreRules struct {
+	LocationRegexes []regexp.Regexp `json:"location_regexes"`
+	SummaryRegexes  []regexp.Regexp `json:"summary_regexes"`
+}
+
+func printConfig(cfg *config) {
+	b64 := base64.StdEncoding
+
+	log.Print("Loaded configuration: ")
+	log.Print("  HTTP Port:  ", cfg.Port)
+	log.Print("  User Tokens:")
+	for user, token := range cfg.UserTokens {
+		log.Print("    User ", user, ":")
+		log.Print("      Hash:  ", b64.EncodeToString(token.Hash))
+		log.Print("      Salt:  ", b64.EncodeToString(token.Salt))
+	}
+	if len(cfg.UserTokens) == 0 {
+		log.Print("    <no users configured>")
+	}
+	log.Print("  Ignoring:")
+	for _, entry := range cfg.Ignore.LocationRegexes {
+		log.Printf("    Events with locations matching %s", entry.String())
+	}
+	for _, entry := range cfg.Ignore.SummaryRegexes {
+		log.Printf("    Events with summaries matching %s", entry.String())
+	}
+	if len(cfg.Ignore.LocationRegexes)+len(cfg.Ignore.SummaryRegexes) == 0 {
+		log.Printf("    <no ignore rules configured>")
+	}
+}
+
+func loadConfigFrom(filename string) config {
+	bytes, err := os.ReadFile(filename)
+	if err != nil {
+		log.Fatal("Could not read config file (at ", filename, ")")
+	}
+	var cfg config
+	if err = json.Unmarshal(bytes, &cfg); err != nil {
+		log.Fatalln("Could not parse config file:", err)
+	}
+	return cfg
+}
+
+func loadConfig() config {
+	configFile := os.Getenv("CONFIG_FILE")
+	if configFile == "" {
+		log.Fatal("Environment variable CONFIG_FILE not specified")
+	}
+	log.Print("Loading configuration from ", configFile)
+	return loadConfigFrom(configFile)
+}
-- 
cgit v1.2.3