Initial Commit

internal/builtins/http.go

@@ -0,0 +1,344 @@
+package builtins
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+
+	"go.elara.ws/logger/log"
+	"go.elara.ws/lure-updater/internal/config"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+	"golang.org/x/crypto/bcrypt"
+)
+
+const maxBodySize = 16384
+
+var (
+	ErrInvalidBodyType   = errors.New("invalid body type")
+	ErrInvalidHdrKeyType = errors.New("invalid header key type")
+	ErrInvalidHdrVal     = errors.New("invalid header value type")
+	ErrInvalidType       = errors.New("invalid type")
+	ErrInsecureWebhook   = errors.New("secure webhook missing authorization")
+)
+
+var httpModule = &starlarkstruct.Module{
+	Name: "http",
+	Members: starlark.StringDict{
+		"get":  starlark.NewBuiltin("http.get", httpGet),
+		"post": starlark.NewBuiltin("http.post", httpPost),
+		"put":  starlark.NewBuiltin("http.put", httpPut),
+		"head": starlark.NewBuiltin("http.head", httpHead),
+	},
+}
+
+func httpGet(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	return makeRequest("http.get", http.MethodGet, args, kwargs, thread)
+}
+
+func httpPost(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	return makeRequest("http.post", http.MethodPost, args, kwargs, thread)
+}
+
+func httpPut(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	return makeRequest("http.put", http.MethodPut, args, kwargs, thread)
+}
+
+func httpHead(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	return makeRequest("http.head", http.MethodHead, args, kwargs, thread)
+}
+
+type starlarkBodyReader struct {
+	io.Reader
+}
+
+func (sbr *starlarkBodyReader) Unpack(v starlark.Value) error {
+	switch v := v.(type) {
+	case starlark.String:
+		sbr.Reader = strings.NewReader(string(v))
+	case starlark.Bytes:
+		sbr.Reader = strings.NewReader(string(v))
+	default:
+		return fmt.Errorf("%w: %s", ErrInvalidBodyType, v.Type())
+	}
+	return nil
+}
+
+func newBodyReader() *starlarkBodyReader {
+	return &starlarkBodyReader{
+		Reader: bytes.NewReader(nil),
+	}
+}
+
+type starlarkHeaders struct {
+	http.Header
+}
+
+func (sh *starlarkHeaders) Unpack(v starlark.Value) error {
+	dict, ok := v.(*starlark.Dict)
+	if !ok {
+		return fmt.Errorf("%w: %s", ErrInvalidType, v.Type())
+	}
+
+	sh.Header = make(http.Header, dict.Len())
+	for _, key := range dict.Keys() {
+		keyStr, ok := key.(starlark.String)
+		if !ok {
+			return fmt.Errorf("%w: %s", ErrInvalidHdrKeyType, key.Type())
+		}
+
+		val, _, _ := dict.Get(key)
+		list, ok := val.(*starlark.List)
+		if !ok {
+			return fmt.Errorf("%w: %s", ErrInvalidHdrVal, val.Type())
+		}
+
+		hdrVals := make([]string, list.Len())
+		for i := 0; i < list.Len(); i++ {
+			hdrVal, ok := list.Index(i).(starlark.String)
+			if !ok {
+				return fmt.Errorf("%w: %s", ErrInvalidHdrVal, list.Index(i).Type())
+			}
+
+			hdrVals[i] = string(hdrVal)
+		}
+
+		sh.Header[string(keyStr)] = hdrVals
+	}
+
+	return nil
+}
+
+func makeRequest(name, method string, args starlark.Tuple, kwargs []starlark.Tuple, thread *starlark.Thread) (starlark.Value, error) {
+	var (
+		url      string
+		redirect = true
+		headers  = &starlarkHeaders{}
+		body     = newBodyReader()
+	)
+	err := starlark.UnpackArgs(name, args, kwargs, "url", &url, "redirect??", &redirect, "headers??", headers, "body??", body)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(method, url, body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header = headers.Header
+
+	client := http.DefaultClient
+	if !redirect {
+		client = &http.Client{
+			CheckRedirect: func(req *http.Request, via []*http.Request) error {
+				return http.ErrUseLastResponse
+			},
+		}
+	}
+
+	log.Debug("Making HTTP request").Str("url", url).Str("method", req.Method).Bool("redirect", redirect).Stringer("pos", thread.CallFrame(1).Pos).Send()
+
+	res, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Debug("Got HTTP response").Str("host", res.Request.URL.Host).Int("code", res.StatusCode).Stringer("pos", thread.CallFrame(1).Pos).Send()
+
+	return starlarkResponse(res), nil
+}
+
+func starlarkResponse(res *http.Response) *starlarkstruct.Struct {
+	return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
+		"code":    starlark.MakeInt(res.StatusCode),
+		"headers": starlarkStringSliceMap(res.Header),
+		"body":    starlarkBody(res.Body),
+	})
+}
+
+func starlarkRequest(req *http.Request) *starlarkstruct.Struct {
+	return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
+		"method":      starlark.String(req.Method),
+		"remote_addr": starlark.String(req.RemoteAddr),
+		"headers":     starlarkStringSliceMap(req.Header),
+		"query":       starlarkStringSliceMap(req.URL.Query()),
+		"body":        starlarkBody(req.Body),
+	})
+}
+
+func starlarkStringSliceMap(ssm map[string][]string) *starlark.Dict {
+	dict := starlark.NewDict(len(ssm))
+	for key, vals := range ssm {
+		sVals := make([]starlark.Value, len(vals))
+		for i, val := range vals {
+			sVals[i] = starlark.String(val)
+		}
+		dict.SetKey(starlark.String(key), starlark.NewList(sVals))
+	}
+	return dict
+}
+
+func starlarkBody(body io.ReadCloser) *starlarkstruct.Struct {
+	return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
+		"string": bodyAsString(body),
+		"bytes":  bodyAsBytes(body),
+		"close":  bodyClose(body),
+	})
+}
+
+func bodyAsBytes(body io.ReadCloser) *starlark.Builtin {
+	return starlark.NewBuiltin("http.response.body.bytes", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		data, err := io.ReadAll(io.LimitReader(body, maxBodySize))
+		if err != nil {
+			return nil, err
+		}
+		return starlark.Bytes(data), nil
+	})
+}
+
+func bodyAsString(body io.ReadCloser) *starlark.Builtin {
+	return starlark.NewBuiltin("http.response.body.string", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		data, err := io.ReadAll(io.LimitReader(body, maxBodySize))
+		if err != nil {
+			return nil, err
+		}
+		return starlark.String(data), nil
+	})
+}
+
+func bodyClose(body io.ReadCloser) *starlark.Builtin {
+	return starlark.NewBuiltin("http.response.body.close", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		err := body.Close()
+		if err != nil {
+			return nil, err
+		}
+		return starlark.None, nil
+	})
+}
+
+func registerWebhook(mux *http.ServeMux, cfg *config.Config, pluginName string) *starlark.Builtin {
+	return starlark.NewBuiltin("register_webhook", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var fn *starlark.Function
+		secure := true
+		err := starlark.UnpackArgs("register_webhook", args, kwargs, "function", &fn, "secure??", &secure)
+		if err != nil {
+			return nil, err
+		}
+
+		if !secure {
+			log.Warn("Plugin is registering an insecure webhook").Str("plugin", pluginName).Send()
+		}
+
+		path := "/webhook/" + pluginName + "/" + fn.Name()
+		mux.HandleFunc(path, webhookHandler(pluginName, secure, cfg, thread, fn))
+		log.Debug("Registered webhook").Str("path", path).Str("function", fn.Name()).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.None, nil
+	})
+}
+
+func webhookHandler(pluginName string, secure bool, cfg *config.Config, thread *starlark.Thread, fn *starlark.Function) http.HandlerFunc {
+	return func(res http.ResponseWriter, req *http.Request) {
+		defer req.Body.Close()
+
+		res.Header().Add("X-Updater-Plugin", pluginName)
+
+		if secure {
+			err := verifySecure(cfg.Webhook.PasswordHash, pluginName, req)
+			if err != nil {
+				log.Error("Error verifying webhook").Err(err).Send()
+				res.WriteHeader(http.StatusForbidden)
+				_, _ = io.WriteString(res, err.Error())
+				return
+			}
+		}
+
+		log.Debug("Calling webhook function").Str("name", fn.Name()).Stringer("pos", fn.Position()).Send()
+		val, err := starlark.Call(thread, fn, starlark.Tuple{starlarkRequest(req)}, nil)
+		if err != nil {
+			log.Error("Error while executing webhook").Err(err).Stringer("pos", fn.Position()).Send()
+			res.WriteHeader(http.StatusInternalServerError)
+			_, _ = io.WriteString(res, err.Error())
+			return
+		}
+
+		switch val := val.(type) {
+		case starlark.NoneType:
+			res.WriteHeader(http.StatusOK)
+		case starlark.Int:
+			var code int
+			err = starlark.AsInt(val, &code)
+			if err == nil {
+				res.WriteHeader(code)
+			} else {
+				res.WriteHeader(http.StatusOK)
+			}
+		case starlark.String, starlark.Bytes:
+			body := newBodyReader()
+			err = body.Unpack(val)
+			if err != nil {
+				log.Error("Error unpacking returned body").Err(err).Send()
+				return
+			}
+			_, err = io.Copy(res, body)
+			if err != nil {
+				log.Error("Error writing body").Err(err).Send()
+				return
+			}
+		case *starlark.Dict:
+			code := http.StatusOK
+			codeVal, ok, _ := val.Get(starlark.String("code"))
+			if ok {
+				err = starlark.AsInt(codeVal, &code)
+				if err != nil {
+					log.Error("Error decoding returned status code").Err(err).Send()
+					return
+				}
+				res.WriteHeader(code)
+			}
+
+			body := newBodyReader()
+			bodyVal, ok, _ := val.Get(starlark.String("body"))
+			if ok {
+				err = body.Unpack(bodyVal)
+				if err != nil {
+					log.Error("Error unpacking returned body").Err(err).Send()
+					return
+				}
+				_, err = io.Copy(res, body)
+				if err != nil {
+					log.Error("Error writing body").Err(err).Send()
+					return
+				}
+			}
+		}
+	}
+}
+
+func verifySecure(pwdHash, pluginName string, req *http.Request) error {
+	var pwd []byte
+	if _, pwdStr, ok := req.BasicAuth(); ok {
+		pwdStr = strings.TrimSpace(pwdStr)
+		pwd = []byte(pwdStr)
+	} else if hdrStr := req.Header.Get("Authorization"); hdrStr != "" {
+		hdrStr = strings.TrimPrefix(hdrStr, "Bearer")
+		hdrStr = strings.TrimSpace(hdrStr)
+		pwd = []byte(hdrStr)
+	} else {
+		log.Warn("Insecure webhook request").
+			Str("from", req.RemoteAddr).
+			Str("plugin", pluginName).
+			Send()
+		return ErrInsecureWebhook
+	}
+
+	fmt.Println(string(pwd))
+
+	if err := bcrypt.CompareHashAndPassword([]byte(pwdHash), pwd); err != nil {
+		return err
+	}
+
+	return nil
+}

internal/builtins/log.go

@@ -0,0 +1,76 @@
+package builtins
+
+import (
+	"strings"
+
+	"go.elara.ws/logger"
+	"go.elara.ws/logger/log"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+)
+
+func logModule(name string) *starlarkstruct.Module {
+	return &starlarkstruct.Module{
+		Name: "log",
+		Members: starlark.StringDict{
+			"debug": logDebug(name),
+			"info":  logInfo(name),
+			"warn":  logWarn(name),
+			"error": logError(name),
+		},
+	}
+}
+
+func logDebug(name string) *starlark.Builtin {
+	return starlark.NewBuiltin("log.debug", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		return starlark.None, doLogEvent(name, "log.debug", log.Debug, thread, args, kwargs)
+	})
+}
+
+func logInfo(name string) *starlark.Builtin {
+	return starlark.NewBuiltin("log.info", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		return starlark.None, doLogEvent(name, "log.info", log.Info, thread, args, kwargs)
+	})
+}
+
+func logWarn(name string) *starlark.Builtin {
+	return starlark.NewBuiltin("log.warn", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		return starlark.None, doLogEvent(name, "log.warn", log.Warn, thread, args, kwargs)
+	})
+}
+
+func logError(name string) *starlark.Builtin {
+	return starlark.NewBuiltin("log.error", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		return starlark.None, doLogEvent(name, "log.error", log.Error, thread, args, kwargs)
+	})
+}
+
+func doLogEvent(pluginName, fnName string, eventFn func(msg string) logger.LogBuilder, thread *starlark.Thread, args starlark.Tuple, kwargs []starlark.Tuple) error {
+	var msg string
+	var fields *starlark.Dict
+	err := starlark.UnpackArgs(fnName, args, kwargs, "msg", &msg, "fields??", &fields)
+	if err != nil {
+		return err
+	}
+
+	evt := eventFn("[" + pluginName + "] " + msg)
+
+	if fields != nil {
+		for _, key := range fields.Keys() {
+			val, _, err := fields.Get(key)
+			if err != nil {
+				return err
+			}
+			keyStr := strings.Trim(key.String(), `"`)
+			evt = evt.Stringer(keyStr, val)
+		}
+	}
+
+	if fnName == "log.debug" {
+		evt = evt.Stringer("pos", thread.CallFrame(1).Pos)
+	}
+
+	evt.Send()
+
+	return nil
+}

internal/builtins/regex.go

@@ -0,0 +1,127 @@
+package builtins
+
+import (
+	"sync"
+
+	"go.elara.ws/pcre"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+)
+
+var (
+	cacheMtx   = &sync.Mutex{}
+	regexCache = map[string]*pcre.Regexp{}
+)
+
+var regexModule = &starlarkstruct.Module{
+	Name: "regex",
+	Members: starlark.StringDict{
+		"compile":      starlark.NewBuiltin("regex.compile", regexCompile),
+		"compile_glob": starlark.NewBuiltin("regex.compile_glob", regexCompileGlob),
+	},
+}
+
+func regexCompile(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var regexStr string
+	err := starlark.UnpackArgs("regex.compile", args, kwargs, "regex", &regexStr)
+	if err != nil {
+		return nil, err
+	}
+
+	cacheMtx.Lock()
+	regex, ok := regexCache[regexStr]
+	if !ok {
+		regex, err = pcre.Compile(regexStr)
+		if err != nil {
+			return nil, err
+		}
+		regexCache[regexStr] = regex
+	}
+	cacheMtx.Unlock()
+
+	return starlarkRegex(regex), nil
+}
+
+func regexCompileGlob(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var globStr string
+	err := starlark.UnpackArgs("regex.compile_glob", args, kwargs, "glob", &globStr)
+	if err != nil {
+		return nil, err
+	}
+
+	cacheMtx.Lock()
+	regex, ok := regexCache[globStr]
+	if !ok {
+		regex, err = pcre.CompileGlob(globStr)
+		if err != nil {
+			return nil, err
+		}
+		regexCache[globStr] = regex
+	}
+	cacheMtx.Unlock()
+
+	return starlarkRegex(regex), nil
+}
+
+func starlarkRegex(regex *pcre.Regexp) *starlarkstruct.Struct {
+	return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
+		"find_all": findAll(regex),
+		"find_one": findOne(regex),
+		"matches":  matches(regex),
+	})
+}
+
+func findAll(regex *pcre.Regexp) *starlark.Builtin {
+	return starlark.NewBuiltin("regex.regexp.find_all", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var in string
+		err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
+		if err != nil {
+			return nil, err
+		}
+
+		matches := regex.FindAllStringSubmatch(in, -1)
+		return matchesToStarlark2D(matches), nil
+	})
+}
+
+func findOne(regex *pcre.Regexp) *starlark.Builtin {
+	return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var in string
+		err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
+		if err != nil {
+			return nil, err
+		}
+
+		match := regex.FindStringSubmatch(in)
+		return matchesToStarlark1D(match), nil
+	})
+}
+
+func matches(regex *pcre.Regexp) *starlark.Builtin {
+	return starlark.NewBuiltin("regex.regexp.find_one", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var in string
+		err := starlark.UnpackArgs("regex.compile", args, kwargs, "in", &in)
+		if err != nil {
+			return nil, err
+		}
+
+		found := regex.MatchString(in)
+		return starlark.Bool(found), nil
+	})
+}
+
+func matchesToStarlark2D(matches [][]string) *starlark.List {
+	outer := make([]starlark.Value, len(matches))
+	for i, match := range matches {
+		outer[i] = matchesToStarlark1D(match)
+	}
+	return starlark.NewList(outer)
+}
+
+func matchesToStarlark1D(match []string) *starlark.List {
+	list := make([]starlark.Value, len(match))
+	for j, val := range match {
+		list[j] = starlark.String(val)
+	}
+	return starlark.NewList(list)
+}

internal/builtins/register.go

@@ -0,0 +1,29 @@
+package builtins
+
+import (
+	"net/http"
+
+	"go.elara.ws/lure-updater/internal/config"
+	"go.etcd.io/bbolt"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkjson"
+)
+
+type Options struct {
+	Name   string
+	DB     *bbolt.DB
+	Config *config.Config
+	Mux    *http.ServeMux
+}
+
+func Register(sd starlark.StringDict, opts *Options) {
+	sd["run_every"] = starlark.NewBuiltin("run_every", runEvery)
+	sd["sleep"] = starlark.NewBuiltin("sleep", sleep)
+	sd["http"] = httpModule
+	sd["regex"] = regexModule
+	sd["store"] = storeModule(opts.DB, opts.Name)
+	sd["updater"] = updaterModule(opts.Config)
+	sd["log"] = logModule(opts.Name)
+	sd["json"] = starlarkjson.Module
+	sd["register_webhook"] = registerWebhook(opts.Mux, opts.Config, opts.Name)
+}

internal/builtins/run_every.go

@@ -0,0 +1,84 @@
+package builtins
+
+import (
+	"sync"
+	"time"
+
+	"go.elara.ws/logger/log"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+)
+
+var (
+	tickerMtx   = &sync.Mutex{}
+	tickerCount = 0
+	tickers     = map[int]*time.Ticker{}
+)
+
+func runEvery(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var every string
+	var fn *starlark.Function
+	err := starlark.UnpackArgs("run_every", args, kwargs, "every", &every, "function", &fn)
+	if err != nil {
+		return nil, err
+	}
+
+	d, err := time.ParseDuration(every)
+	if err != nil {
+		return nil, err
+	}
+
+	tickerMtx.Lock()
+	t := time.NewTicker(d)
+	handle := tickerCount
+	tickers[handle] = t
+	tickerCount++
+	tickerMtx.Unlock()
+	log.Debug("Created new ticker").Int("handle", handle).Str("duration", every).Stringer("pos", thread.CallFrame(1).Pos).Send()
+
+	go func() {
+		for range t.C {
+			log.Debug("Calling scheduled function").Str("name", fn.Name()).Stringer("pos", fn.Position()).Send()
+			_, err := starlark.Call(thread, fn, nil, nil)
+			if err != nil {
+				log.Warn("Error while executing scheduled function").Str("name", fn.Name()).Stringer("pos", fn.Position()).Err(err).Send()
+			}
+		}
+	}()
+
+	return newTickerHandle(handle), nil
+}
+
+func sleep(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var duration string
+	err := starlark.UnpackArgs("sleep", args, kwargs, "duration", &duration)
+	if err != nil {
+		return nil, err
+	}
+
+	d, err := time.ParseDuration(duration)
+	if err != nil {
+		return nil, err
+	}
+
+	log.Debug("Sleeping").Str("duration", duration).Stringer("pos", thread.CallFrame(1).Pos).Send()
+	time.Sleep(d)
+	return starlark.None, nil
+}
+
+func stopTicker(handle int) *starlark.Builtin {
+	return starlark.NewBuiltin("stop", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		tickerMtx.Lock()
+		tickers[handle].Stop()
+		delete(tickers, handle)
+		tickerMtx.Unlock()
+		log.Debug("Stopped ticker").Int("handle", handle).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.None, nil
+	})
+}
+
+func newTickerHandle(handle int) starlark.Value {
+	return starlarkstruct.FromStringDict(starlarkstruct.Default, starlark.StringDict{
+		"stop": stopTicker(handle),
+	})
+}

internal/builtins/store.go

@@ -0,0 +1,98 @@
+package builtins
+
+import (
+	"go.elara.ws/logger/log"
+	"go.etcd.io/bbolt"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+)
+
+func storeModule(db *bbolt.DB, bucketName string) *starlarkstruct.Module {
+	return &starlarkstruct.Module{
+		Name: "store",
+		Members: starlark.StringDict{
+			"set":    storeSet(db, bucketName),
+			"get":    storeGet(db, bucketName),
+			"delete": storeDelete(db, bucketName),
+		},
+	}
+}
+
+func storeSet(db *bbolt.DB, bucketName string) *starlark.Builtin {
+	return starlark.NewBuiltin("store.set", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var key, value string
+		err := starlark.UnpackArgs("store.set", args, kwargs, "key", &key, "value", &value)
+		if err != nil {
+			return nil, err
+		}
+
+		err = db.Update(func(tx *bbolt.Tx) error {
+			bucket, err := tx.CreateBucketIfNotExists([]byte(bucketName))
+			if err != nil {
+				return err
+			}
+			err = bucket.Put([]byte(key), []byte(value))
+			if err != nil {
+				return err
+			}
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Set value").Str("bucket", bucketName).Str("key", key).Str("value", value).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.None, nil
+	})
+}
+
+func storeGet(db *bbolt.DB, bucketName string) *starlark.Builtin {
+	return starlark.NewBuiltin("store.get", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var key string
+		err := starlark.UnpackArgs("store.get", args, kwargs, "key", &key)
+		if err != nil {
+			return nil, err
+		}
+
+		var value string
+		err = db.Update(func(tx *bbolt.Tx) error {
+			bucket, err := tx.CreateBucketIfNotExists([]byte(bucketName))
+			if err != nil {
+				return err
+			}
+			data := bucket.Get([]byte(key))
+			value = string(data)
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Retrieved value").Str("bucket", bucketName).Str("key", key).Str("value", value).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.String(value), nil
+	})
+}
+
+func storeDelete(db *bbolt.DB, bucketName string) *starlark.Builtin {
+	return starlark.NewBuiltin("store.delete", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var key string
+		err := starlark.UnpackArgs("store.delete", args, kwargs, "key", &key)
+		if err != nil {
+			return nil, err
+		}
+
+		err = db.Update(func(tx *bbolt.Tx) error {
+			bucket, err := tx.CreateBucketIfNotExists([]byte(bucketName))
+			if err != nil {
+				return err
+			}
+			return bucket.Delete([]byte(key))
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Deleted value").Str("bucket", bucketName).Str("key", key).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.None, nil
+	})
+}

internal/builtins/updater.go

@@ -0,0 +1,181 @@
+package builtins
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/plumbing/transport/http"
+	"go.elara.ws/logger/log"
+	"go.elara.ws/lure-updater/internal/config"
+	"go.starlark.net/starlark"
+	"go.starlark.net/starlarkstruct"
+)
+
+func updaterModule(cfg *config.Config) *starlarkstruct.Module {
+	return &starlarkstruct.Module{
+		Name: "updater",
+		Members: starlark.StringDict{
+			"repo_dir":           starlark.String(cfg.Git.RepoDir),
+			"pull":               updaterPull(cfg),
+			"push_changes":       updaterPushChanges(cfg),
+			"get_package_file":   getPackageFile(cfg),
+			"write_package_file": writePackageFile(cfg),
+		},
+	}
+}
+
+// repoMtx makes sure two starlark threads can
+// never access the repo at the same time
+var repoMtx = &sync.Mutex{}
+
+func updaterPull(cfg *config.Config) *starlark.Builtin {
+	return starlark.NewBuiltin("updater.pull", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		repoMtx.Lock()
+		defer repoMtx.Unlock()
+
+		repo, err := git.PlainOpen(cfg.Git.RepoDir)
+		if err != nil {
+			return nil, err
+		}
+
+		w, err := repo.Worktree()
+		if err != nil {
+			return nil, err
+		}
+
+		err = w.Pull(&git.PullOptions{Progress: os.Stderr})
+		if err != git.NoErrAlreadyUpToDate && err != nil {
+			return nil, err
+		}
+
+		return starlark.None, nil
+	})
+}
+
+func updaterPushChanges(cfg *config.Config) *starlark.Builtin {
+	return starlark.NewBuiltin("updater.push_changes", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var msg string
+		err := starlark.UnpackArgs("updater.push_changes", args, kwargs, "msg", &msg)
+		if err != nil {
+			return nil, err
+		}
+
+		repoMtx.Lock()
+		defer repoMtx.Unlock()
+
+		repo, err := git.PlainOpen(cfg.Git.RepoDir)
+		if err != nil {
+			return nil, err
+		}
+
+		w, err := repo.Worktree()
+		if err != nil {
+			return nil, err
+		}
+
+		status, err := w.Status()
+		if err != nil {
+			return nil, err
+		}
+
+		if status.IsClean() {
+			return starlark.None, nil
+		}
+
+		err = w.Pull(&git.PullOptions{Progress: os.Stderr})
+		if err != git.NoErrAlreadyUpToDate && err != nil {
+			return nil, err
+		}
+
+		_, err = w.Add(".")
+		if err != nil {
+			return nil, err
+		}
+
+		sig := &object.Signature{
+			Name:  cfg.Git.Commit.Name,
+			Email: cfg.Git.Commit.Email,
+			When:  time.Now(),
+		}
+
+		h, err := w.Commit(msg, &git.CommitOptions{
+			Author:    sig,
+			Committer: sig,
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Created new commit").Stringer("hash", h).Stringer("pos", thread.CallFrame(1).Pos).Send()
+
+		err = repo.Push(&git.PushOptions{
+			Progress: os.Stderr,
+			Auth: &http.BasicAuth{
+				Username: cfg.Git.Credentials.Username,
+				Password: cfg.Git.Credentials.Password,
+			},
+		})
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Successfully pushed to repo").Stringer("pos", thread.CallFrame(1).Pos).Send()
+
+		return starlark.None, nil
+	})
+}
+
+func getPackageFile(cfg *config.Config) *starlark.Builtin {
+	return starlark.NewBuiltin("updater.get_package_file", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var pkg, filename string
+		err := starlark.UnpackArgs("updater.get_package_file", args, kwargs, "pkg", &pkg, "filename", &filename)
+		if err != nil {
+			return nil, err
+		}
+
+		repoMtx.Lock()
+		defer repoMtx.Unlock()
+
+		path := filepath.Join(cfg.Git.RepoDir, pkg, filename)
+		data, err := os.ReadFile(path)
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Got package file").Str("package", pkg).Str("filename", filename).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.String(data), nil
+	})
+}
+
+func writePackageFile(cfg *config.Config) *starlark.Builtin {
+	return starlark.NewBuiltin("updater.write_package_file", func(thread *starlark.Thread, b *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+		var pkg, filename, content string
+		err := starlark.UnpackArgs("updater.write_package_file", args, kwargs, "pkg", &pkg, "filename", &filename, "content", &content)
+		if err != nil {
+			return nil, err
+		}
+
+		repoMtx.Lock()
+		defer repoMtx.Unlock()
+
+		path := filepath.Join(cfg.Git.RepoDir, pkg, filename)
+		fl, err := os.Create(path)
+		if err != nil {
+			return nil, err
+		}
+
+		_, err = io.Copy(fl, strings.NewReader(content))
+		if err != nil {
+			return nil, err
+		}
+
+		log.Debug("Wrote package file").Str("package", pkg).Str("filename", filename).Stringer("pos", thread.CallFrame(1).Pos).Send()
+		return starlark.None, nil
+	})
+}