rebased embedr (#3511)
* skeleton of embedr service, based on bskyweb * embedr container setup * builds on this branch * actual routes * fix embedr go:embed * tweak embedr dockerfile * progress on embedr * fix path params * tweaks to build process * try to get embedr dockerfile to install embed deps * build this branch * updates to match sam's output HTML * try to unbreak embedr dockerfile * small embedr tweak * docker hack * get embed.js copied over to embedr * don't x-frame-options for embed.bsky.app * bskyembed: remove a console.log * use html/template for golang snippet generation * simplify embedr API fetches * missing file * Rm console.log fully --------- Co-authored-by: Dan Abramov <dan.abramov@gmail.com>
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30 changed files with 912 additions and 42 deletions
207
bskyweb/cmd/embedr/handlers.go
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207
bskyweb/cmd/embedr/handlers.go
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@ -0,0 +1,207 @@
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package main
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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appbsky "github.com/bluesky-social/indigo/api/bsky"
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"github.com/bluesky-social/indigo/atproto/syntax"
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"github.com/labstack/echo/v4"
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)
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var ErrPostNotFound = errors.New("post not found")
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var ErrPostNotPublic = errors.New("post is not publicly accessible")
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func (srv *Server) getBlueskyPost(ctx context.Context, did syntax.DID, rkey syntax.RecordKey) (*appbsky.FeedDefs_PostView, error) {
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// fetch the post post (with extra context)
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uri := fmt.Sprintf("at://%s/app.bsky.feed.post/%s", did, rkey)
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tpv, err := appbsky.FeedGetPostThread(ctx, srv.xrpcc, 1, 0, uri)
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if err != nil {
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log.Warnf("failed to fetch post: %s\t%v", uri, err)
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// TODO: detect 404, specifically?
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return nil, ErrPostNotFound
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}
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if tpv.Thread.FeedDefs_BlockedPost != nil {
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return nil, ErrPostNotPublic
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} else if tpv.Thread.FeedDefs_ThreadViewPost.Post == nil {
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return nil, ErrPostNotFound
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}
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postView := tpv.Thread.FeedDefs_ThreadViewPost.Post
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for _, label := range postView.Author.Labels {
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if label.Src == postView.Author.Did && label.Val == "!no-unauthenticated" {
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return nil, ErrPostNotPublic
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}
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}
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return postView, nil
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}
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func (srv *Server) WebHome(c echo.Context) error {
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return c.Render(http.StatusOK, "home.html", nil)
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}
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type OEmbedResponse struct {
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Type string `json:"type"`
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Version string `json:"version"`
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AuthorName string `json:"author_name,omitempty"`
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AuthorURL string `json:"author_url,omitempty"`
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ProviderName string `json:"provider_url,omitempty"`
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CacheAge int `json:"cache_age,omitempty"`
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Width int `json:"width,omitempty"`
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Height *int `json:"height,omitempty"`
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HTML string `json:"html,omitempty"`
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}
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func (srv *Server) parseBlueskyURL(ctx context.Context, raw string) (*syntax.ATURI, error) {
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if raw == "" {
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return nil, fmt.Errorf("empty url")
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}
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// first try simple AT-URI
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uri, err := syntax.ParseATURI(raw)
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if nil == err {
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return &uri, nil
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}
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// then try bsky.app post URL
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u, err := url.Parse(raw)
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if err != nil {
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return nil, err
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}
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if u.Hostname() != "bsky.app" {
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return nil, fmt.Errorf("only bsky.app URLs currently supported")
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}
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pathParts := strings.Split(u.Path, "/") // NOTE: pathParts[0] will be empty string
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if len(pathParts) != 5 || pathParts[1] != "profile" || pathParts[3] != "post" {
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return nil, fmt.Errorf("only bsky.app post URLs currently supported")
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}
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atid, err := syntax.ParseAtIdentifier(pathParts[2])
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if err != nil {
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return nil, err
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}
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rkey, err := syntax.ParseRecordKey(pathParts[4])
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if err != nil {
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return nil, err
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}
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var did syntax.DID
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if atid.IsHandle() {
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ident, err := srv.dir.Lookup(ctx, *atid)
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if err != nil {
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return nil, err
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}
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did = ident.DID
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} else {
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did, err = atid.AsDID()
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if err != nil {
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return nil, err
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}
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}
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// TODO: don't really need to re-parse here, if we had test coverage
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aturi, err := syntax.ParseATURI(fmt.Sprintf("at://%s/app.bsky.feed.post/%s", did, rkey))
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if err != nil {
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return nil, err
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} else {
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return &aturi, nil
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}
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}
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func (srv *Server) WebOEmbed(c echo.Context) error {
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formatParam := c.QueryParam("format")
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if formatParam != "" && formatParam != "json" {
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return c.String(http.StatusNotImplemented, "Unsupported oEmbed format: "+formatParam)
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}
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// TODO: do we actually do something with width?
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width := 550
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maxWidthParam := c.QueryParam("maxwidth")
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if maxWidthParam != "" {
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maxWidthInt, err := strconv.Atoi(maxWidthParam)
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if err != nil || maxWidthInt < 220 || maxWidthInt > 550 {
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return c.String(http.StatusBadRequest, "Invalid maxwidth (expected integer between 220 and 550)")
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}
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width = maxWidthInt
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}
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// NOTE: maxheight ignored
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aturi, err := srv.parseBlueskyURL(c.Request().Context(), c.QueryParam("url"))
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if err != nil {
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return c.String(http.StatusBadRequest, fmt.Sprintf("Expected 'url' to be bsky.app URL or AT-URI: %v", err))
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}
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if aturi.Collection() != syntax.NSID("app.bsky.feed.post") {
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return c.String(http.StatusNotImplemented, "Only posts (app.bsky.feed.post records) can be embedded currently")
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}
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did, err := aturi.Authority().AsDID()
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if err != nil {
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return err
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}
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post, err := srv.getBlueskyPost(c.Request().Context(), did, aturi.RecordKey())
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if err == ErrPostNotFound {
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return c.String(http.StatusNotFound, fmt.Sprintf("%v", err))
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} else if err == ErrPostNotPublic {
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return c.String(http.StatusForbidden, fmt.Sprintf("%v", err))
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} else if err != nil {
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return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
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}
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html, err := srv.postEmbedHTML(post)
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if err != nil {
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return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
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}
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data := OEmbedResponse{
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Type: "rich",
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Version: "1.0",
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AuthorName: "@" + post.Author.Handle,
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AuthorURL: fmt.Sprintf("https://bsky.app/profile/%s", post.Author.Handle),
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ProviderName: "Bluesky Social",
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CacheAge: 86400,
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Width: width,
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Height: nil,
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HTML: html,
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}
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if post.Author.DisplayName != nil {
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data.AuthorName = fmt.Sprintf("%s (@%s)", *post.Author.DisplayName, post.Author.Handle)
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}
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return c.JSON(http.StatusOK, data)
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}
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func (srv *Server) WebPostEmbed(c echo.Context) error {
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// sanity check arguments. don't 4xx, just let app handle if not expected format
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rkeyParam := c.Param("rkey")
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rkey, err := syntax.ParseRecordKey(rkeyParam)
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if err != nil {
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return c.String(http.StatusBadRequest, fmt.Sprintf("Invalid RecordKey: %v", err))
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}
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didParam := c.Param("did")
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did, err := syntax.ParseDID(didParam)
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if err != nil {
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return c.String(http.StatusBadRequest, fmt.Sprintf("Invalid DID: %v", err))
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}
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_ = rkey
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_ = did
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// NOTE: this request was't really necessary; the JS will do the same fetch
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/*
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postView, err := srv.getBlueskyPost(ctx, did, rkey)
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if err == ErrPostNotFound {
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return c.String(http.StatusNotFound, fmt.Sprintf("%v", err))
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} else if err == ErrPostNotPublic {
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return c.String(http.StatusForbidden, fmt.Sprintf("%v", err))
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} else if err != nil {
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return c.String(http.StatusInternalServerError, fmt.Sprintf("%v", err))
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}
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*/
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return c.Render(http.StatusOK, "postEmbed.html", nil)
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}
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