118 lines
3.0 KiB
Go
118 lines
3.0 KiB
Go
// blocked services fetches the most recent Hostlists Registry blocked service
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// index and transforms the filters from it to AdGuard Home's data and code
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// formats.
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"net/url"
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"os"
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"text/template"
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"time"
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"github.com/AdguardTeam/golibs/log"
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"golang.org/x/exp/slices"
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)
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func main() {
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urlStr := "https://adguardteam.github.io/HostlistsRegistry/assets/services.json"
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if v, ok := os.LookupEnv("URL"); ok {
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urlStr = v
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}
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// Validate the URL.
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_, err := url.Parse(urlStr)
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check(err)
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c := &http.Client{
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Timeout: 10 * time.Second,
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}
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resp, err := c.Get(urlStr)
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check(err)
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defer log.OnCloserError(resp.Body, log.ERROR)
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if resp.StatusCode != http.StatusOK {
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panic(fmt.Errorf("expected code %d, got %d", http.StatusOK, resp.StatusCode))
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}
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hlSvcs := &hlServices{}
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err = json.NewDecoder(resp.Body).Decode(hlSvcs)
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check(err)
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// Sort all services and rules to make the output more predictable.
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slices.SortStableFunc(hlSvcs.BlockedServices, func(a, b *hlServicesService) (less bool) {
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return a.ID < b.ID
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})
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for _, s := range hlSvcs.BlockedServices {
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slices.Sort(s.Rules)
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}
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// Use another set of delimiters to prevent them interfering with the Go
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// code.
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tmpl, err := template.New("main").Delims("<%", "%>").Funcs(template.FuncMap{
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"isnotlast": func(idx, sliceLen int) (ok bool) { return idx != sliceLen-1 },
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}).Parse(tmplStr)
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check(err)
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f, err := os.OpenFile(
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"./internal/filtering/servicelist.go",
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os.O_CREATE|os.O_TRUNC|os.O_WRONLY,
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0o644,
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)
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check(err)
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defer log.OnCloserError(f, log.ERROR)
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err = tmpl.Execute(f, hlSvcs)
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check(err)
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}
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// tmplStr is the template for the Go source file with the services.
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const tmplStr = `// Code generated by go run ./scripts/blocked-services/main.go; DO NOT EDIT.
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package filtering
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// blockedService represents a single blocked service.
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type blockedService struct {
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ID string ` + "`" + `json:"id"` + "`" + `
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Name string ` + "`" + `json:"name"` + "`" + `
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IconSVG []byte ` + "`" + `json:"icon_svg"` + "`" + `
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Rules []string ` + "`" + `json:"rules"` + "`" + `
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}
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// blockedServices contains raw blocked service data.
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var blockedServices = []blockedService{<% $l := len .BlockedServices %>
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<%- range $i, $s := .BlockedServices %>{
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ID: <% printf "%q" $s.ID %>,
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Name: <% printf "%q" $s.Name %>,
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IconSVG: []byte(<% printf "%q" $s.IconSVG %>),
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Rules: []string{<% range $s.Rules %>
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<% printf "%q" . %>,<% end %>
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},
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}<% if isnotlast $i $l %>, <% end %><% end %>}
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`
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// check is a simple error-checking helper for scripts.
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func check(err error) {
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if err != nil {
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panic(err)
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}
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}
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// hlServices is the JSON structure for the Hostlists Registry blocked service
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// index.
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type hlServices struct {
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BlockedServices []*hlServicesService `json:"blocked_services"`
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}
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// hlServicesService is the JSON structure for a service in the Hostlists
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// Registry.
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type hlServicesService struct {
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ID string `json:"id"`
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Name string `json:"name"`
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IconSVG string `json:"icon_svg"`
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Rules []string `json:"rules"`
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}
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