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package app
import (
"encoding/json"
"os"
"regexp"
"skunkyart/static"
"strconv"
"time"
"github.com/zerolabsco/devianter"
)
// Release carries the build's version and description, set at link time and
// shown by --help and the API.
var Release struct {
Version string
Description string
}
type cacheConfig struct {
Enabled bool `json:"enabled"`
MemCache bool `json:"memcache"`
Path string `json:"path"`
MaxSize int64 `json:"max-size"`
Lifetime string `json:"lifetime"`
UpdateInterval int64 `json:"update-interval"`
}
type config struct {
cfg string
Listen string `json:"listen"`
URI string `json:"uri"`
Cache cacheConfig `json:"cache"`
Proxy bool `json:"proxy"`
Nsfw bool `json:"nsfw"`
UserAgent string `json:"user-agent"`
DownloadProxy string `json:"download-proxy"`
StaticPath string `json:"static-path"`
}
// CFG is the running instance's configuration, holding the defaults below until
// ExecuteConfig overwrites them from the config file.
var CFG = config{
cfg: "config.json",
Listen: "127.0.0.1:3003",
URI: "/",
Cache: cacheConfig{
Enabled: false,
Path: "cache",
UpdateInterval: 1,
},
StaticPath: "static",
UserAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36",
Proxy: true,
Nsfw: true,
}
var lifetimeParsed int64
// checkCacheWritable creates the cache directory if it is missing and confirms
// this process can actually write into it, returning the error that a real cache
// write would hit.
//
// An unwritable cache directory is otherwise a silent cliff: every media request
// still succeeds by re-downloading from the CDN, so the only symptom is one
// "permission denied" line per request and a cache that never fills.
func checkCacheWritable(path string) error {
if err := os.MkdirAll(path, 0700); err != nil {
return err
}
probe := path + "/.skunkyart-write-probe"
if err := os.WriteFile(probe, nil, 0600); err != nil {
return err
}
return os.Remove(probe)
}
// ExecuteConfig loads the config file into CFG, validates it, and starts the
// cache rotation loop if caching is on. It exits the process on a config that
// cannot be read, that asks for caching without proxying, or that points caching
// at a directory this process cannot write.
func ExecuteConfig() {
if CFG.cfg != "" {
f, err := os.ReadFile(CFG.cfg)
tryWithExitStatus(err, 1)
tryWithExitStatus(json.Unmarshal(f, &CFG), 1)
if CFG.Cache.Enabled && !CFG.Proxy {
exit("Incompatible settings detected: cannot use caching media content without proxy", 1)
}
if CFG.Cache.Enabled {
if err := checkCacheWritable(CFG.Cache.Path); err != nil {
exit("Cache directory is not writable by this process (uid "+
strconv.Itoa(os.Getuid())+"): "+err.Error()+
"\nGrant that uid write access to the directory, or set cache.enabled to false."+
"\nThe official container image runs as uid 10000, so a bind-mounted cache needs:"+
"\n chown -R 10000:10000 <cache dir on the host>", 1)
}
if CFG.Cache.Lifetime != "" {
var duration int64
day := 24 * time.Hour.Milliseconds()
numstr := regexp.MustCompile("[0-9]+").FindAllString(CFG.Cache.Lifetime, -1)
num, _ := strconv.Atoi(numstr[len(numstr)-1])
switch unit := CFG.Cache.Lifetime[len(CFG.Cache.Lifetime)-1:]; unit {
case "i":
duration = time.Minute.Milliseconds()
case "h":
duration = time.Hour.Milliseconds()
case "d":
duration = day
case "w":
duration = day * 7
case "m":
duration = day * 30
case "y":
duration = day * 360
default:
exit("Invalid unit specified: "+unit, 1)
}
lifetimeParsed = duration * int64(num)
}
// max-size is documented in megabytes. This was 1024^2, which in Go is
// XOR (1026), not exponentiation — so the cap was ~1000x too small.
CFG.Cache.MaxSize *= 1024 * 1024
go InitCacheSystem()
}
About = instanceAbout{
Proxy: CFG.Proxy,
Nsfw: CFG.Nsfw,
}
static.StaticPath = CFG.StaticPath
devianter.UserAgent = CFG.UserAgent
}
}
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