107 lines
3 KiB
Go
107 lines
3 KiB
Go
package resolver
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import (
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"context"
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"fmt"
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"net/http"
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"regexp"
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"time"
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"github.com/FAU-CDI/wdresolve"
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"github.com/FAU-CDI/wdresolve/resolvers"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component/control/static"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component/control/static/custom"
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"github.com/FAU-CDI/wisski-distillery/internal/dis/component/instances"
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"github.com/FAU-CDI/wisski-distillery/pkg/httpx"
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"github.com/FAU-CDI/wisski-distillery/pkg/lazy"
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"github.com/rs/zerolog"
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_ "embed"
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)
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type Resolver struct {
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component.Base
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Dependencies struct {
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Instances *instances.Instances
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Custom *custom.Custom
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}
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prefixes lazy.Lazy[map[string]string] // cached prefixes (from the server)
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RefreshInterval time.Duration
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handler lazy.Lazy[wdresolve.ResolveHandler] // handler
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}
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var (
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_ component.Routeable = (*Resolver)(nil)
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_ component.Cronable = (*Resolver)(nil)
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)
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func (resolver *Resolver) Routes() component.Routes {
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return component.Routes{
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Paths: []string{"/go/", "/wisski/get/"},
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CSRF: false,
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}
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}
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//go:embed "resolver.html"
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var resolverHTMLStr string
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var resolverTemplate = static.AssetsHome.MustParseShared("resolver.html", resolverHTMLStr)
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type resolverContext struct {
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custom.BaseContext
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wdresolve.IndexContext
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}
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func (resolver *Resolver) HandleRoute(ctx context.Context, route string) (http.Handler, error) {
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resolverTemplate := resolver.Dependencies.Custom.Template(resolverTemplate)
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logger := zerolog.Ctx(ctx)
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var err error
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return resolver.handler.Get(func() (p wdresolve.ResolveHandler) {
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p.HandleIndex = func(context wdresolve.IndexContext, w http.ResponseWriter, r *http.Request) {
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ctx := resolverContext{
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IndexContext: context,
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}
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resolver.Dependencies.Custom.Update(&ctx, r)
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httpx.WriteHTML(ctx, nil, resolverTemplate, "", w, r)
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}
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p.TrustXForwardedProto = true
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fallback := &resolvers.Regexp{
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Data: map[string]string{},
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}
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// handle the default domain name!
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domainName := resolver.Config.DefaultDomain
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if domainName != "" {
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fallback.Data[fmt.Sprintf("^https?://(.*)\\.%s", regexp.QuoteMeta(domainName))] = fmt.Sprintf("https://$1.%s", domainName)
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logger.Info().Str("name", domainName).Msg("registering default domain")
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}
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// handle the extra domains!
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for _, domain := range resolver.Config.SelfExtraDomains {
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fallback.Data[fmt.Sprintf("^https?://(.*)\\.%s", regexp.QuoteMeta(domain))] = fmt.Sprintf("https://$1.%s", domainName)
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logger.Info().Str("name", domainName).Msg("registering legacy domain")
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}
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// resolve the prefixes
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p.Resolver = resolvers.InOrder{
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resolver,
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fallback,
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}
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return p
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}), err
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}
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func (resolver *Resolver) Target(uri string) string {
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return wdresolve.PrefixTarget(resolver, uri)
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}
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// Prefixes returns a cached list of prefixes
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func (resolver *Resolver) Prefixes() (prefixes map[string]string) {
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return resolver.prefixes.Get(nil) // by precondition there always is a cached value
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}
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