84 lines
2 KiB
Go
84 lines
2 KiB
Go
package wellknown
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import (
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"git.sleepycat.moe/sam/mercury/internal/database/sql"
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"git.sleepycat.moe/sam/mercury/web/api"
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"github.com/rs/zerolog/log"
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)
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func (app *App) WebFinger(w http.ResponseWriter, r *http.Request) (any, error) {
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ctx := r.Context()
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validDomains := app.AppConfig.Web.WebFingerDomains()
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resource, err := url.QueryUnescape(r.FormValue("resource"))
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if err != nil {
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return nil, api.Error{Code: api.ErrBadRequest}
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}
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if !strings.HasPrefix(resource, "acct:") {
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return nil, api.Error{Code: api.ErrBadRequest, Details: "WebFinger only supports `acct:` queries"}
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}
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resource = strings.TrimPrefix(resource, "acct:")
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username, domain, ok := strings.Cut(resource, "@")
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if !ok {
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return nil, api.Error{Code: api.ErrBadRequest}
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}
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if !anyMatches(validDomains, domain) {
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return nil, api.Error{Code: api.ErrBadRequest, Details: "Not a local user on this instance"}
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}
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blog, err := app.Blog().ByName(ctx, username, "")
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if err != nil {
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if err == sql.ErrNotFound {
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return nil, api.Error{Code: api.ErrNotFound}
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}
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log.Err(err).Str("username", username).Msg("looking up user for webfinger request")
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return nil, err
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}
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webFingerHref := fmt.Sprintf("%s/@%s", app.AppConfig.Web.Domain, blog.Name)
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return WebFinger{
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Subject: fmt.Sprintf("acct:%s@%s", blog.Name, validDomains[0]),
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Aliases: []string{webFingerHref},
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Links: []WebFingerLink{
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{
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Rel: "http://webfinger.net/rel/profile-page",
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Type: "text/html",
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Href: webFingerHref,
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},
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{
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Rel: "self",
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Type: "application/activity+json",
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Href: webFingerHref,
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},
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},
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}, nil
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}
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type WebFinger struct {
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Subject string `json:"subject"`
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Aliases []string `json:"aliases"`
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Links []WebFingerLink `json:"links"`
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}
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type WebFingerLink struct {
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Rel string `json:"rel"`
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Type string `json:"type"`
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Href string `json:"href"`
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}
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func anyMatches[T comparable](slice []T, t T) bool {
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for _, entry := range slice {
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if entry == t {
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return true
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}
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}
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return false
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}
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