From d52fd6ba58a883a49f5b691d4db53e5d1fc78e61 Mon Sep 17 00:00:00 2001
From: Guillermo Serrahima <dev@vylion.com>
Date: Fri, 20 Mar 2026 01:18:24 +0100
Subject: Single post handler

---
 backend/fetchers/app.bsky.feed.go |  2 ++
 backend/main.go                   | 44 +++++++++++++++++++++++++++++++++++++++
 backend/notes/note.go             |  9 ++++++++
 3 files changed, 55 insertions(+)

diff --git a/backend/fetchers/app.bsky.feed.go b/backend/fetchers/app.bsky.feed.go
index 1b9acc1..5d87cca 100644
--- a/backend/fetchers/app.bsky.feed.go
+++ b/backend/fetchers/app.bsky.feed.go
@@ -152,6 +152,8 @@ func FetchParents(logger *slog.Logger, replyToURI string, slingshotURL string, s
 		note, err := GetAppBskyFeedPostByURI(logger, currentURI, slingshotURL, session, cache)
 		if err != nil {
 			logger.Warn("failed to fetch parent", "uri", currentURI, "error", err)
+			cache.Set(currentURI, notes.MissingNote(currentURI))
+			parents = append(parents, currentURI)
 			break
 		}
 
diff --git a/backend/main.go b/backend/main.go
index 234d57d..c7a463e 100644
--- a/backend/main.go
+++ b/backend/main.go
@@ -7,6 +7,7 @@ import (
 	"llostre/backend/fetchers"
 	"log/slog"
 	"net/http"
+	"net/url"
 	"os"
 	"strings"
 	"sync"
@@ -317,6 +318,48 @@ func postsHandler(w http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(w).Encode(posts)
 }
 
+func postHandler(w http.ResponseWriter, r *http.Request) {
+	uri := strings.TrimPrefix(r.URL.Path, "/api/post/")
+	if uri == "" {
+		http.Error(w, "uri required", http.StatusBadRequest)
+		return
+	}
+
+	// decode if URL-encoded
+	uri, err := url.QueryUnescape(uri)
+	if err != nil {
+		http.Error(w, "invalid uri", http.StatusBadRequest)
+		return
+	}
+
+	var currentSession *auth.OAuthState
+	cookie, err := r.Cookie("session_token")
+	if err != nil {
+		logger.Warn("unauthorized")
+	} else {
+		sessionsMutex.RLock()
+		session, exists := sessions[cookie.Value]
+		sessionsMutex.RUnlock()
+
+		if !exists {
+			logger.Warn("invalid session")
+		} else {
+			refreshTokens(session, cookie.Value)
+
+			currentSession = session
+		}
+	}
+
+	note, err := fetchers.GetAppBskyFeedPostByURI(logger, uri, slingshotURL, currentSession, cache)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(note)
+}
+
 func main() {
 	// serve static files
 	fs := http.FileServer(http.Dir("../frontend/dist"))
@@ -327,5 +370,6 @@ func main() {
 	http.HandleFunc("/api/session", sessionHandler)
 	http.HandleFunc("/api/login", loginHandler)
 	http.HandleFunc("/api/callback", callbackHandler)
+	http.HandleFunc("/api/post/", postHandler) // /api/post/{uri}
 	http.ListenAndServe("0.0.0.0:8080", nil)
 }
diff --git a/backend/notes/note.go b/backend/notes/note.go
index 591caff..569188c 100644
--- a/backend/notes/note.go
+++ b/backend/notes/note.go
@@ -26,6 +26,15 @@ type Facet struct {
 	Value     string `json:"value"` // the link destination, whether url, profile or tag
 }
 
+func MissingNote(uri string) *Note {
+	return &Note{
+		URI:       uri,
+		AuthorDID: "MISSING",
+		Text:      "This post could not be fetched. It may have been deleted.",
+		CreatedAt: time.Time{},
+	}
+}
+
 func isChainContained(smallChain, bigChain []string) bool {
 	if len(smallChain) > len(bigChain) {
 		return false
-- 
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