page.post.go

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package main

import (
	"encoding/json"
	"html/template"
	"net/http"
	"slices"
	"strings"
	"time"
)

type Post struct {
	ID          string
	Created     time.Time
	Modified    time.Time
	Content     string
	ContentHTML template.HTML

	Link    string
	Actor   *Actor
	ReplyTo string

	Sensitive bool

	Likes   int
	Shares  int
	Replies int
	LocalID string
}

func ComparePost(a *Post, b *Post) int {
	return a.Created.Compare(b.Created)
}

func FromNote(id string, user *User, actor string, note *NoteMeta) *Post {
	post := &Post{}
	post.Created, _ = time.Parse("2006-01-02T15:04:05Z", note.Published)
	post.ContentHTML = template.HTML(user.config.UGCPolicy.Sanitize(note.Content))
	if actor, err := user.fetchActorInfo(actor, true); err != nil {
		post.Actor = &Actor{
			ID: note.actor,
		}
	} else {
		post.Actor = actor
	}
	post.ID = id
	post.LocalID = note.LocalID()
	post.Link = note.ID
	post.Sensitive = note.Sensitive

	// also mark as sensitive if the To field isn't public...
	if !slices.Contains(note.To, "https://www.w3.org/ns/activitystreams#Public") {
		post.Sensitive = true
	}
	// used for xml encoding...
	post.Content = note.Content
	post.Content = strings.ReplaceAll(post.Content, "&", "&")
	post.Content = strings.ReplaceAll(post.Content, "<", "&lt;")
	post.Content = strings.ReplaceAll(post.Content, ">", "&gt;")
	post.Likes = CacheCount(user, "likes", note.LocalID())
	post.Shares = CacheCount(user, "shares", note.LocalID())
	return post
}

func (user *User) processPostJson(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	id = strings.TrimSuffix(id, ".json")
	if data, err := FromCache(user, "notes", "", user.ID+"/posts/"+id); err == nil {
		note := &NoteMeta{}
		json.Unmarshal(data, note)

		note.Replies = CollectionMeta{ID: user.ID + "/posts/" + id + "/replies", Type: "Collection", TotalItems: CacheCount(user, "replies", id)}
		note.Likes = CollectionMeta{ID: user.ID + "/posts/" + id + "/likes", Type: "Collection", TotalItems: CacheCount(user, "likes", id)}
		note.Shares = CollectionMeta{ID: user.ID + "/posts/" + id + "/replies", Type: "Collection", TotalItems: CacheCount(user, "shares", id)}

		item := NoteMetaWithContext{}
		item.Context = []ContextElement{
			{Simple: StringOrArray{"https://www.w3.org/ns/activitystreams"}},
			{Complex: map[string]string{"ostatus": "http://ostatus.org#", "atomUri": "ostatus:atomUri", "inReplyToAtomUri": "ostatus:inReplyToAtomUri", "conversation": "ostatus:conversation", "sensitive": "as:sensitive", "toot": "http://joinmastodon.org/ns#", "votersCount": "toot:votersCount"}},
		}
		item.NoteMeta = *note
		w.Header().Add("Content-Type", "application/activity+json")
		data, _ := json.Marshal(item)
		w.Write(data)
	} else {
		http.NotFound(w, r)
	}
}

func (user *User) processFollowers(w http.ResponseWriter, r *http.Request) {
	collection := CollectionMetaWithContext{}
	collection.Context = "https://www.w3.org/ns/activitystreams"
	collection.ID = user.ID + "/followers"
	collection.Type = "Collection"
	collection.TotalItems = CacheCount(user, "followers", "")
	w.Header().Add("Content-Type", "application/activity+json")
	data, _ := json.Marshal(collection)
	w.Write(data)
}

func (user *User) processCollection(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	id = strings.TrimSuffix(id, ".json")
	if data, err := FromCache(user, "notes", "", user.ID+"/posts/"+id); err == nil {
		note := &NoteMeta{}
		json.Unmarshal(data, note)

		collectionName := r.PathValue("collection")
		collection := CollectionMetaWithContext{}
		collection.Context = "https://www.w3.org/ns/activitystreams"
		collection.ID = user.ID + "/posts/" + id + "/" + collectionName
		collection.Type = "Collection"
		collection.TotalItems = CacheCount(user, collectionName, id)

		w.Header().Add("Content-Type", "application/activity+json")
		data, _ := json.Marshal(collection)
		w.Write(data)
	} else {
		http.NotFound(w, r)
	}
}

func (user *User) processPost(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if !strings.HasSuffix(id, ".json") && strings.Contains(r.Header.Get("accept"), "text/html") {
		if data, err := FromCache(user, "notes", "", user.ID+"/posts/"+id); err == nil {
			note := &NoteMeta{}
			json.Unmarshal(data, note)
			fpost := FromNote(CacheId(user, "notes", "", user.ID+"/posts/"+id), user, user.ID, note)

			posts := []*Post{}
			isAdmin, _ := user.config.IsAdmin(r)
			WalkCache(user, "replies", id, func(id string, b []byte) {
				postmeta := &PostMeta{}
				if err := json.Unmarshal(b, postmeta); err == nil {
					post := FromNote(id, user, postmeta.Actor, &postmeta.Object)
					if isAdmin {
						post.Sensitive = false
					}
					posts = append(posts, post)
				}
			})

			slices.SortFunc(posts, ComparePost)
			page := user.config.DefaultPage(r)
			page.User = user
			page.Posts = posts
			page.IsAdmin = isAdmin
			page.FeaturedPost = fpost
			user.config.Templates.ExecuteTemplate(w, "mentions.tpl.html", page)
			return
		} else {
			http.NotFound(w, r)
			return
		}
	}
	user.processPostJson(w, r)
}