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>
This commit is contained in:
bnewbold
GitHub
parent
196dd3a8ab
commit
58842d03a9
30 changed files with 912 additions and 42 deletions
1
bskyweb/cmd/embedr/.gitignore
vendored
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1
bskyweb/cmd/embedr/.gitignore
vendored
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@ -0,0 +1 @@
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/bskyweb
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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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60
bskyweb/cmd/embedr/main.go
Normal file
60
bskyweb/cmd/embedr/main.go
Normal file
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package main
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import (
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"os"
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_ "github.com/joho/godotenv/autoload"
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logging "github.com/ipfs/go-log"
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"github.com/urfave/cli/v2"
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)
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var log = logging.Logger("embedr")
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func init() {
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logging.SetAllLoggers(logging.LevelDebug)
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//logging.SetAllLoggers(logging.LevelWarn)
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}
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func main() {
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run(os.Args)
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}
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func run(args []string) {
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app := cli.App{
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Name: "embedr",
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Usage: "web server for embed.bsky.app post embeds",
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}
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app.Commands = []*cli.Command{
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&cli.Command{
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Name: "serve",
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Usage: "run the server",
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Action: serve,
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Flags: []cli.Flag{
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&cli.StringFlag{
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Name: "appview-host",
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Usage: "method, hostname, and port of PDS instance",
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Value: "https://public.api.bsky.app",
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EnvVars: []string{"ATP_APPVIEW_HOST"},
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},
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&cli.StringFlag{
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Name: "http-address",
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Usage: "Specify the local IP/port to bind to",
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Required: false,
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Value: ":8100",
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EnvVars: []string{"HTTP_ADDRESS"},
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},
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&cli.BoolFlag{
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Name: "debug",
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Usage: "Enable debug mode",
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Value: false,
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Required: false,
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EnvVars: []string{"DEBUG"},
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},
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},
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},
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}
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app.RunAndExitOnError()
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}
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16
bskyweb/cmd/embedr/render.go
Normal file
16
bskyweb/cmd/embedr/render.go
Normal file
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package main
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import (
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"html/template"
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"io"
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"github.com/labstack/echo/v4"
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)
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type Template struct {
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templates *template.Template
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}
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func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
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return t.templates.ExecuteTemplate(w, name, data)
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}
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236
bskyweb/cmd/embedr/server.go
Normal file
236
bskyweb/cmd/embedr/server.go
Normal file
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@ -0,0 +1,236 @@
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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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"html/template"
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"io/fs"
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"net/http"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"time"
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"github.com/bluesky-social/indigo/atproto/identity"
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"github.com/bluesky-social/indigo/util/cliutil"
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"github.com/bluesky-social/indigo/xrpc"
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"github.com/bluesky-social/social-app/bskyweb"
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"github.com/klauspost/compress/gzhttp"
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"github.com/klauspost/compress/gzip"
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"github.com/labstack/echo/v4"
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"github.com/labstack/echo/v4/middleware"
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"github.com/urfave/cli/v2"
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)
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type Server struct {
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echo *echo.Echo
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httpd *http.Server
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xrpcc *xrpc.Client
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dir identity.Directory
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}
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func serve(cctx *cli.Context) error {
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debug := cctx.Bool("debug")
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httpAddress := cctx.String("http-address")
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appviewHost := cctx.String("appview-host")
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|
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// Echo
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e := echo.New()
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|
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// create a new session (no auth)
|
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xrpcc := &xrpc.Client{
|
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Client: cliutil.NewHttpClient(),
|
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Host: appviewHost,
|
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}
|
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|
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// httpd
|
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var (
|
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httpTimeout = 2 * time.Minute
|
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httpMaxHeaderBytes = 2 * (1024 * 1024)
|
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gzipMinSizeBytes = 1024 * 2
|
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gzipCompressionLevel = gzip.BestSpeed
|
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gzipExceptMIMETypes = []string{"image/png"}
|
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)
|
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|
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// Wrap the server handler in a gzip handler to compress larger responses.
|
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gzipHandler, err := gzhttp.NewWrapper(
|
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gzhttp.MinSize(gzipMinSizeBytes),
|
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gzhttp.CompressionLevel(gzipCompressionLevel),
|
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gzhttp.ExceptContentTypes(gzipExceptMIMETypes),
|
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)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
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|
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//
|
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// server
|
||||
//
|
||||
server := &Server{
|
||||
echo: e,
|
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xrpcc: xrpcc,
|
||||
dir: identity.DefaultDirectory(),
|
||||
}
|
||||
|
||||
// Create the HTTP server.
|
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server.httpd = &http.Server{
|
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Handler: gzipHandler(server),
|
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Addr: httpAddress,
|
||||
WriteTimeout: httpTimeout,
|
||||
ReadTimeout: httpTimeout,
|
||||
MaxHeaderBytes: httpMaxHeaderBytes,
|
||||
}
|
||||
|
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e.HideBanner = true
|
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|
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tmpl := &Template{
|
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templates: template.Must(template.ParseFS(bskyweb.EmbedrTemplateFS, "embedr-templates/*.html")),
|
||||
}
|
||||
e.Renderer = tmpl
|
||||
e.HTTPErrorHandler = server.errorHandler
|
||||
|
||||
e.IPExtractor = echo.ExtractIPFromXFFHeader()
|
||||
|
||||
// SECURITY: Do not modify without due consideration.
|
||||
e.Use(middleware.SecureWithConfig(middleware.SecureConfig{
|
||||
ContentTypeNosniff: "nosniff",
|
||||
// diable XFrameOptions; we're embedding here!
|
||||
HSTSMaxAge: 31536000, // 365 days
|
||||
// TODO:
|
||||
// ContentSecurityPolicy
|
||||
// XSSProtection
|
||||
}))
|
||||
e.Use(middleware.LoggerWithConfig(middleware.LoggerConfig{
|
||||
// Don't log requests for static content.
|
||||
Skipper: func(c echo.Context) bool {
|
||||
return strings.HasPrefix(c.Request().URL.Path, "/static")
|
||||
},
|
||||
}))
|
||||
e.Use(middleware.RateLimiterWithConfig(middleware.RateLimiterConfig{
|
||||
Skipper: middleware.DefaultSkipper,
|
||||
Store: middleware.NewRateLimiterMemoryStoreWithConfig(
|
||||
middleware.RateLimiterMemoryStoreConfig{
|
||||
Rate: 10, // requests per second
|
||||
Burst: 30, // allow bursts
|
||||
ExpiresIn: 3 * time.Minute, // garbage collect entries older than 3 minutes
|
||||
},
|
||||
),
|
||||
IdentifierExtractor: func(ctx echo.Context) (string, error) {
|
||||
id := ctx.RealIP()
|
||||
return id, nil
|
||||
},
|
||||
DenyHandler: func(c echo.Context, identifier string, err error) error {
|
||||
return c.String(http.StatusTooManyRequests, "Your request has been rate limited. Please try again later. Contact support@bsky.app if you believe this was a mistake.\n")
|
||||
},
|
||||
}))
|
||||
|
||||
// redirect trailing slash to non-trailing slash.
|
||||
// all of our current endpoints have no trailing slash.
|
||||
e.Use(middleware.RemoveTrailingSlashWithConfig(middleware.TrailingSlashConfig{
|
||||
RedirectCode: http.StatusFound,
|
||||
}))
|
||||
|
||||
//
|
||||
// configure routes
|
||||
//
|
||||
// static files
|
||||
staticHandler := http.FileServer(func() http.FileSystem {
|
||||
if debug {
|
||||
log.Debugf("serving static file from the local file system")
|
||||
return http.FS(os.DirFS("embedr-static"))
|
||||
}
|
||||
fsys, err := fs.Sub(bskyweb.EmbedrStaticFS, "embedr-static")
|
||||
if err != nil {
|
||||
log.Fatal(err)
|
||||
}
|
||||
return http.FS(fsys)
|
||||
}())
|
||||
|
||||
e.GET("/robots.txt", echo.WrapHandler(staticHandler))
|
||||
e.GET("/ips-v4", echo.WrapHandler(staticHandler))
|
||||
e.GET("/ips-v6", echo.WrapHandler(staticHandler))
|
||||
e.GET("/.well-known/*", echo.WrapHandler(staticHandler))
|
||||
e.GET("/security.txt", func(c echo.Context) error {
|
||||
return c.Redirect(http.StatusMovedPermanently, "/.well-known/security.txt")
|
||||
})
|
||||
e.GET("/static/*", echo.WrapHandler(http.StripPrefix("/static/", staticHandler)), func(next echo.HandlerFunc) echo.HandlerFunc {
|
||||
return func(c echo.Context) error {
|
||||
path := c.Request().URL.Path
|
||||
maxAge := 1 * (60 * 60) // default is 1 hour
|
||||
|
||||
// Cache javascript and images files for 1 week, which works because
|
||||
// they're always versioned (e.g. /static/js/main.64c14927.js)
|
||||
if strings.HasPrefix(path, "/static/js/") || strings.HasPrefix(path, "/static/images/") {
|
||||
maxAge = 7 * (60 * 60 * 24) // 1 week
|
||||
}
|
||||
|
||||
c.Response().Header().Set("Cache-Control", fmt.Sprintf("public, max-age=%d", maxAge))
|
||||
return next(c)
|
||||
}
|
||||
})
|
||||
|
||||
// actual routes
|
||||
e.GET("/", server.WebHome)
|
||||
e.GET("/iframe-resize.js", echo.WrapHandler(staticHandler))
|
||||
e.GET("/embed.js", echo.WrapHandler(staticHandler))
|
||||
e.GET("/oembed", server.WebOEmbed)
|
||||
e.GET("/embed/:did/app.bsky.feed.post/:rkey", server.WebPostEmbed)
|
||||
|
||||
// Start the server.
|
||||
log.Infof("starting server address=%s", httpAddress)
|
||||
go func() {
|
||||
if err := server.httpd.ListenAndServe(); err != nil {
|
||||
if !errors.Is(err, http.ErrServerClosed) {
|
||||
log.Errorf("HTTP server shutting down unexpectedly: %s", err)
|
||||
}
|
||||
}
|
||||
}()
|
||||
|
||||
// Wait for a signal to exit.
|
||||
log.Info("registering OS exit signal handler")
|
||||
quit := make(chan struct{})
|
||||
exitSignals := make(chan os.Signal, 1)
|
||||
signal.Notify(exitSignals, syscall.SIGINT, syscall.SIGTERM)
|
||||
go func() {
|
||||
sig := <-exitSignals
|
||||
log.Infof("received OS exit signal: %s", sig)
|
||||
|
||||
// Shut down the HTTP server.
|
||||
if err := server.Shutdown(); err != nil {
|
||||
log.Errorf("HTTP server shutdown error: %s", err)
|
||||
}
|
||||
|
||||
// Trigger the return that causes an exit.
|
||||
close(quit)
|
||||
}()
|
||||
<-quit
|
||||
log.Infof("graceful shutdown complete")
|
||||
return nil
|
||||
}
|
||||
|
||||
func (srv *Server) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
|
||||
srv.echo.ServeHTTP(rw, req)
|
||||
}
|
||||
|
||||
func (srv *Server) Shutdown() error {
|
||||
log.Info("shutting down")
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
|
||||
defer cancel()
|
||||
|
||||
return srv.httpd.Shutdown(ctx)
|
||||
}
|
||||
|
||||
func (srv *Server) errorHandler(err error, c echo.Context) {
|
||||
code := http.StatusInternalServerError
|
||||
if he, ok := err.(*echo.HTTPError); ok {
|
||||
code = he.Code
|
||||
}
|
||||
c.Logger().Error(err)
|
||||
data := map[string]interface{}{
|
||||
"statusCode": code,
|
||||
}
|
||||
c.Render(code, "error.html", data)
|
||||
}
|
||||
71
bskyweb/cmd/embedr/snippet.go
Normal file
71
bskyweb/cmd/embedr/snippet.go
Normal file
|
|
@ -0,0 +1,71 @@
|
|||
package main
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"html/template"
|
||||
|
||||
appbsky "github.com/bluesky-social/indigo/api/bsky"
|
||||
"github.com/bluesky-social/indigo/atproto/syntax"
|
||||
)
|
||||
|
||||
func (srv *Server) postEmbedHTML(postView *appbsky.FeedDefs_PostView) (string, error) {
|
||||
// ensure that there isn't an injection from the URI
|
||||
aturi, err := syntax.ParseATURI(postView.Uri)
|
||||
if err != nil {
|
||||
log.Error("bad AT-URI in reponse", "aturi", aturi, "err", err)
|
||||
return "", err
|
||||
}
|
||||
|
||||
post, ok := postView.Record.Val.(*appbsky.FeedPost)
|
||||
if !ok {
|
||||
log.Error("bad post record value", "err", err)
|
||||
return "", err
|
||||
}
|
||||
|
||||
const tpl = `<blockquote class="bluesky-embed" data-bluesky-uri="{{ .PostURI }}" data-bluesky-cid="{{ .PostCID }}"><p{{ if .PostLang }} lang="{{ .PostLang }}"{{ end }}>{{ .PostText }}</p>— {{ .PostAuthor }} {{ .PostIndexedAt }}</blockquote><script async src="{{ .WidgetURL }}" charset="utf-8"></script>`
|
||||
|
||||
t, err := template.New("snippet").Parse(tpl)
|
||||
if err != nil {
|
||||
log.Error("template parse error", "err", err)
|
||||
return "", err
|
||||
}
|
||||
|
||||
var lang string
|
||||
if len(post.Langs) > 0 {
|
||||
lang = post.Langs[0]
|
||||
}
|
||||
var authorName string
|
||||
if postView.Author.DisplayName != nil {
|
||||
authorName = fmt.Sprintf("%s (@%s)", *postView.Author.DisplayName, postView.Author.Handle)
|
||||
} else {
|
||||
authorName = fmt.Sprintf("@%s", postView.Author.Handle)
|
||||
}
|
||||
fmt.Println(postView.Uri)
|
||||
fmt.Println(fmt.Sprintf("%s", postView.Uri))
|
||||
data := struct {
|
||||
PostURI template.URL
|
||||
PostCID string
|
||||
PostLang string
|
||||
PostText string
|
||||
PostAuthor string
|
||||
PostIndexedAt string
|
||||
WidgetURL template.URL
|
||||
}{
|
||||
PostURI: template.URL(postView.Uri),
|
||||
PostCID: postView.Cid,
|
||||
PostLang: lang,
|
||||
PostText: post.Text,
|
||||
PostAuthor: authorName,
|
||||
PostIndexedAt: postView.IndexedAt, // TODO: createdAt?
|
||||
WidgetURL: template.URL("https://embed.bsky.app/static/embed.js"),
|
||||
}
|
||||
|
||||
var buf bytes.Buffer
|
||||
err = t.Execute(&buf, data)
|
||||
if err != nil {
|
||||
log.Error("template parse error", "err", err)
|
||||
return "", err
|
||||
}
|
||||
return buf.String(), nil
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue