96 lines
2.3 KiB
Go
96 lines
2.3 KiB
Go
package auth
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import (
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"context"
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"encoding/json"
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"io"
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"net/http"
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"codeberg.org/u1f320/pronouns.cc/backend/server"
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"emperror.dev/errors"
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)
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const errNoNodeinfoURL = errors.Sentinel("no valid nodeinfo rel found")
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// nodeinfo queries an instance's nodeinfo and returns the software name.
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func nodeinfo(ctx context.Context, instance string) (softwareName string, err error) {
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req, err := http.NewRequestWithContext(ctx, "GET", "https://"+instance+"/.well-known/nodeinfo", nil)
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if err != nil {
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return "", errors.Wrap(err, "creating .well-known/nodeinfo request")
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}
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req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
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req.Header.Set("Accept", "application/json")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", errors.Wrap(err, "sending .well-known/nodeinfo request")
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}
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defer resp.Body.Close()
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jb, err := io.ReadAll(resp.Body)
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if err != nil {
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return "", errors.Wrap(err, "reading .well-known/nodeinfo response")
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}
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var wkr wellKnownResponse
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err = json.Unmarshal(jb, &wkr)
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if err != nil {
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return "", errors.Wrap(err, "unmarshaling .well-known/nodeinfo response")
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}
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var nodeinfoURL string
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for _, link := range wkr.Links {
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if link.Rel == "http://nodeinfo.diaspora.software/ns/schema/2.0" {
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nodeinfoURL = link.Href
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break
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}
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}
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if nodeinfoURL == "" {
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return "", errNoNodeinfoURL
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}
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req, err = http.NewRequestWithContext(ctx, "GET", nodeinfoURL, nil)
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if err != nil {
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return "", errors.Wrap(err, "creating nodeinfo request")
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}
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req.Header.Set("User-Agent", "pronouns.cc/"+server.Tag)
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req.Header.Set("Accept", "application/json")
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resp, err = http.DefaultClient.Do(req)
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if err != nil {
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return "", errors.Wrap(err, "sending nodeinfo request")
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}
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defer resp.Body.Close()
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jb, err = io.ReadAll(resp.Body)
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if err != nil {
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return "", errors.Wrap(err, "reading nodeinfo response")
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}
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var ni partialNodeinfo
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err = json.Unmarshal(jb, &ni)
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if err != nil {
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return "", errors.Wrap(err, "unmarshaling nodeinfo response")
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}
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return ni.Software.Name, nil
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}
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type wellKnownResponse struct {
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Links []wellKnownLink `json:"links"`
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}
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type wellKnownLink struct {
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Rel string `json:"rel"`
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Href string `json:"href"`
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}
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type partialNodeinfo struct {
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Software nodeinfoSoftware `json:"software"`
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}
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type nodeinfoSoftware struct {
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Name string `json:"name"`
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}
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