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config.go
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config.go
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package main
import (
"bufio"
"bytes"
"encoding/hex"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"runtime"
"strconv"
"strings"
)
func intEnvConfig(i *int, name string) {
if env, err := strconv.Atoi(os.Getenv(name)); err == nil {
*i = env
}
}
func megaIntEnvConfig(f *int, name string) {
if env, err := strconv.ParseFloat(os.Getenv(name), 64); err == nil {
*f = int(env * 1000000)
}
}
func strEnvConfig(s *string, name string) {
if env := os.Getenv(name); len(env) > 0 {
*s = env
}
}
func boolEnvConfig(b *bool, name string) {
*b = false
if env, err := strconv.ParseBool(os.Getenv(name)); err == nil {
*b = env
}
}
func hexEnvConfig(b *[]byte, name string) {
var err error
if env := os.Getenv(name); len(env) > 0 {
if *b, err = hex.DecodeString(env); err != nil {
log.Fatalf("%s expected to be hex-encoded string\n", name)
}
}
}
func hexFileConfig(b *[]byte, filepath string) {
if len(filepath) == 0 {
return
}
f, err := os.Open(filepath)
if err != nil {
log.Fatalf("Can't open file %s\n", filepath)
}
src, err := ioutil.ReadAll(f)
if err != nil {
log.Fatalln(err)
}
src = bytes.TrimSpace(src)
dst := make([]byte, hex.DecodedLen(len(src)))
n, err := hex.Decode(dst, src)
if err != nil {
log.Fatalf("%s expected to contain hex-encoded string\n", filepath)
}
*b = dst[:n]
}
func presetEnvConfig(p presets, name string) {
if env := os.Getenv(name); len(env) > 0 {
presetStrings := strings.Split(env, ",")
for _, presetStr := range presetStrings {
parsePreset(p, presetStr)
}
}
}
func presetFileConfig(p presets, filepath string) {
if len(filepath) == 0 {
return
}
f, err := os.Open(filepath)
if err != nil {
log.Fatalf("Can't open file %s\n", filepath)
}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
parsePreset(p, scanner.Text())
}
if err := scanner.Err(); err != nil {
log.Fatalf("Failed to read presets file: %s", err)
}
}
type config struct {
Bind string
ReadTimeout int
WaitTimeout int
WriteTimeout int
DownloadTimeout int
Concurrency int
MaxClients int
TTL int
MaxSrcDimension int
MaxSrcResolution int
JpegProgressive bool
PngInterlaced bool
Quality int
GZipCompression int
EnableWebpDetection bool
EnforceWebp bool
Key []byte
Salt []byte
AllowInsecure bool
Secret string
AllowOrigin string
IgnoreSslVerification bool
LocalFileSystemRoot string
S3Enabled bool
ETagEnabled bool
BaseURL string
Presets presets
}
var conf = config{
Bind: ":8080",
ReadTimeout: 10,
WriteTimeout: 10,
DownloadTimeout: 5,
Concurrency: runtime.NumCPU() * 2,
TTL: 3600,
IgnoreSslVerification: false,
MaxSrcDimension: 8192,
MaxSrcResolution: 16800000,
AllowInsecure: false,
Quality: 80,
GZipCompression: 5,
ETagEnabled: false,
S3Enabled: false,
}
func init() {
keyPath := flag.String("keypath", "", "path of the file with hex-encoded key")
saltPath := flag.String("saltpath", "", "path of the file with hex-encoded salt")
presetsPath := flag.String("presets", "", "path of the file with presets")
showVersion := flag.Bool("v", false, "show version")
flag.Parse()
if *showVersion {
fmt.Println(version)
os.Exit(0)
}
if port := os.Getenv("PORT"); len(port) > 0 {
conf.Bind = fmt.Sprintf(":%s", port)
}
strEnvConfig(&conf.Bind, "IMGPROXY_BIND")
intEnvConfig(&conf.ReadTimeout, "IMGPROXY_READ_TIMEOUT")
intEnvConfig(&conf.WriteTimeout, "IMGPROXY_WRITE_TIMEOUT")
intEnvConfig(&conf.DownloadTimeout, "IMGPROXY_DOWNLOAD_TIMEOUT")
intEnvConfig(&conf.Concurrency, "IMGPROXY_CONCURRENCY")
intEnvConfig(&conf.MaxClients, "IMGPROXY_MAX_CLIENTS")
intEnvConfig(&conf.TTL, "IMGPROXY_TTL")
intEnvConfig(&conf.MaxSrcDimension, "IMGPROXY_MAX_SRC_DIMENSION")
megaIntEnvConfig(&conf.MaxSrcResolution, "IMGPROXY_MAX_SRC_RESOLUTION")
boolEnvConfig(&conf.JpegProgressive, "IMGPROXY_JPEG_PROGRESSIVE")
boolEnvConfig(&conf.PngInterlaced, "IMGPROXY_PNG_INTERLACED")
intEnvConfig(&conf.Quality, "IMGPROXY_QUALITY")
intEnvConfig(&conf.GZipCompression, "IMGPROXY_GZIP_COMPRESSION")
boolEnvConfig(&conf.EnableWebpDetection, "IMGPROXY_ENABLE_WEBP_DETECTION")
boolEnvConfig(&conf.EnforceWebp, "IMGPROXY_ENFORCE_WEBP")
hexEnvConfig(&conf.Key, "IMGPROXY_KEY")
hexEnvConfig(&conf.Salt, "IMGPROXY_SALT")
hexFileConfig(&conf.Key, *keyPath)
hexFileConfig(&conf.Salt, *saltPath)
strEnvConfig(&conf.Secret, "IMGPROXY_SECRET")
strEnvConfig(&conf.AllowOrigin, "IMGPROXY_ALLOW_ORIGIN")
boolEnvConfig(&conf.IgnoreSslVerification, "IMGPROXY_IGNORE_SSL_VERIFICATION")
strEnvConfig(&conf.LocalFileSystemRoot, "IMGPROXY_LOCAL_FILESYSTEM_ROOT")
boolEnvConfig(&conf.S3Enabled, "IMGPROXY_USE_S3")
boolEnvConfig(&conf.ETagEnabled, "IMGPROXY_USE_ETAG")
strEnvConfig(&conf.BaseURL, "IMGPROXY_BASE_URL")
conf.Presets = make(presets)
presetEnvConfig(conf.Presets, "IMGPROXY_PRESETS")
presetFileConfig(conf.Presets, *presetsPath)
if len(conf.Key) == 0 {
warning("Key is not defined, so signature checking is disabled")
conf.AllowInsecure = true
}
if len(conf.Salt) == 0 {
warning("Salt is not defined, so signature checking is disabled")
conf.AllowInsecure = true
}
if len(conf.Bind) == 0 {
log.Fatalln("Bind address is not defined")
}
if conf.ReadTimeout <= 0 {
log.Fatalf("Read timeout should be greater than 0, now - %d\n", conf.ReadTimeout)
}
if conf.WriteTimeout <= 0 {
log.Fatalf("Write timeout should be greater than 0, now - %d\n", conf.WriteTimeout)
}
if conf.DownloadTimeout <= 0 {
log.Fatalf("Download timeout should be greater than 0, now - %d\n", conf.DownloadTimeout)
}
if conf.Concurrency <= 0 {
log.Fatalf("Concurrency should be greater than 0, now - %d\n", conf.Concurrency)
}
if conf.MaxClients <= 0 {
conf.MaxClients = conf.Concurrency * 10
}
if conf.TTL <= 0 {
log.Fatalf("TTL should be greater than 0, now - %d\n", conf.TTL)
}
if conf.MaxSrcDimension <= 0 {
log.Fatalf("Max src dimension should be greater than 0, now - %d\n", conf.MaxSrcDimension)
}
if conf.MaxSrcResolution <= 0 {
log.Fatalf("Max src resolution should be greater than 0, now - %d\n", conf.MaxSrcResolution)
}
if conf.Quality <= 0 {
log.Fatalf("Quality should be greater than 0, now - %d\n", conf.Quality)
} else if conf.Quality > 100 {
log.Fatalf("Quality can't be greater than 100, now - %d\n", conf.Quality)
}
if conf.GZipCompression < 0 {
log.Fatalf("GZip compression should be greater than or quual to 0, now - %d\n", conf.GZipCompression)
} else if conf.GZipCompression > 9 {
log.Fatalf("GZip compression can't be greater than 9, now - %d\n", conf.GZipCompression)
}
if conf.IgnoreSslVerification {
warning("Ignoring SSL verification is very unsafe")
}
if conf.LocalFileSystemRoot != "" {
stat, err := os.Stat(conf.LocalFileSystemRoot)
if err != nil {
log.Fatalf("Cannot use local directory: %s", err)
} else {
if !stat.IsDir() {
log.Fatalf("Cannot use local directory: not a directory")
}
}
if conf.LocalFileSystemRoot == "/" {
log.Print("Exposing root via IMGPROXY_LOCAL_FILESYSTEM_ROOT is unsafe")
}
}
checkPresets(conf.Presets)
initVips()
initDownloading()
}