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|
package fetchers
import (
"encoding/json"
"fmt"
"io"
"llostre/backend/general"
"net"
"net/http"
"strings"
)
type DIDDocument struct {
AlsoKnownAs []string `json:"alsoKnownAs"`
Service []struct {
ID string `json:"id"`
Type string `json:"type"`
ServiceEndpoint string `json:"serviceEndpoint"`
} `json:"service"`
}
func FetchDID(handle string) (string, error) {
// return if it's a DID already
if strings.HasPrefix(handle, "did:") {
return handle, nil
}
// resolve DNS record first
txtRecords, err := net.LookupTXT("_atproto." + handle)
if err == nil {
for _, txt := range txtRecords {
if after, ok := strings.CutPrefix(txt, "did="); ok {
return after, nil
}
}
}
// fallback to HTTPS well-known
resp, err := http.Get(fmt.Sprintf("https://%s/.well-known/atproto-did", handle))
if err != nil {
return "", err
}
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
did := strings.TrimSpace(string(body))
if !strings.HasPrefix(did, "did:") {
return "", fmt.Errorf("invalid DID returned: %s", did)
}
return did, nil
}
func FetchDidDoc(did string) (*DIDDocument, error) {
didDocURL := fmt.Sprintf("https://plc.directory/%s", did)
resp, err := http.Get(didDocURL)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("DID resolution failed: %d", resp.StatusCode)
}
var didDoc DIDDocument
if err := json.NewDecoder(resp.Body).Decode(&didDoc); err != nil {
return nil, err
}
return &didDoc, nil
}
func FetchHandle(did string) (string, error) {
var didDoc, err = FetchDidDoc(did)
if err != nil {
return "", err
}
if len(didDoc.AlsoKnownAs) == 0 {
return "", fmt.Errorf("no handle found")
}
handle := strings.TrimPrefix(didDoc.AlsoKnownAs[0], "at://")
return handle, nil
}
func FetchPDS(did string) (string, error) {
var didDoc, err = FetchDidDoc(did)
if err != nil {
return "", err
}
for _, svc := range didDoc.Service {
if svc.Type == "AtprotoPersonalDataServer" {
return svc.ServiceEndpoint, nil
}
}
return "", fmt.Errorf("no PDS found for DID %s", did)
}
func FetchHandleAndPDS(did string) (string, string, error) {
var didDoc, err = FetchDidDoc(did)
if err != nil {
return "", "", err
}
if len(didDoc.AlsoKnownAs) == 0 {
return "", "", fmt.Errorf("no handle found")
}
var pds string
for _, svc := range didDoc.Service {
if svc.Type == "AtprotoPersonalDataServer" {
pds = svc.ServiceEndpoint
break
}
}
handle := strings.TrimPrefix(didDoc.AlsoKnownAs[0], "at://")
return handle, pds, nil
}
func FetchProfile(did, pdsURL string, cache *Cache) (*general.Profile, error) {
recordURL := fmt.Sprintf("%s/xrpc/com.atproto.repo.getRecord?repo=%s&collection=app.bsky.actor.profile&rkey=self", pdsURL, did)
resp, err := http.Get(recordURL)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("profile fetch failed: %d", resp.StatusCode)
}
handle, err := FetchHandle(did)
if err != nil {
handle = "handle.invalid"
}
var response general.ProfileRecordResponse
if err := json.NewDecoder(resp.Body).Decode(&response); err != nil {
return nil, err
}
var avatarURL, bannerURL string
if response.Value.Avatar != nil {
avatarURL = fmt.Sprintf("https://cdn.bsky.app/img/avatar/plain/%s/%s@jpeg", did, response.Value.Avatar.Ref.Link)
}
if response.Value.Banner != nil {
bannerURL = fmt.Sprintf("https://cdn.bsky.app/img/banner/plain/%s/%s@jpeg", did, response.Value.Banner.Ref.Link)
}
profile := &general.Profile{
Handle: handle,
DisplayName: response.Value.DisplayName,
AvatarURL: avatarURL,
BannerURL: bannerURL,
Pronouns: response.Value.Pronouns,
}
cache.SetProfile(handle, profile)
return profile, nil
}
func FetchProfiles(dids []string, pdsURL string, cache *Cache) map[string]general.Profile {
profiles := make(map[string]general.Profile)
for _, did := range dids {
profile, err := FetchProfile(did, pdsURL, cache)
if err == nil {
cache.SetProfile(did, profile)
profiles[did] = *profile
}
}
return profiles
}
|
