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@ -2,23 +2,27 @@ package http |
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import ( |
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"bytes" |
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"compress/gzip" |
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"errors" |
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"fmt" |
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"image" |
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"image/jpeg" |
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"image/png" |
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"io" |
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"io/fs" |
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"net/http" |
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"path/filepath" |
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"strings" |
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"time" |
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"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil" |
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"github.com/mediocregopher/blog.mediocregopher.com/srv/post" |
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"github.com/omeid/go-tarfs" |
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"golang.org/x/image/draw" |
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) |
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func isImgResizable(id string) bool { |
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switch strings.ToLower(filepath.Ext(id)) { |
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func isImgResizable(path string) bool { |
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switch strings.ToLower(filepath.Ext(path)) { |
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case ".jpg", ".jpeg", ".png": |
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return true |
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default: |
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@ -84,62 +88,173 @@ func (a *api) managePostAssetsHandler() http.Handler { |
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}) |
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} |
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func (a *api) getPostAssetHandler() http.Handler { |
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type postAssetArchiveInfo struct { |
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path string |
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id string |
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subPath string |
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isGzipped bool |
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} |
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { |
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func extractPostAssetArchiveInfo(path string) (postAssetArchiveInfo, bool) { |
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id := filepath.Base(r.URL.Path) |
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var info postAssetArchiveInfo |
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maxWidth, err := apiutil.StrToInt(r.FormValue("w"), 0) |
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if err != nil { |
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apiutil.BadRequest(rw, r, fmt.Errorf("invalid w parameter: %w", err)) |
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return |
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} |
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info.path = strings.TrimPrefix(path, "/") |
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buf := new(bytes.Buffer) |
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info.id, info.subPath, _ = strings.Cut(info.path, "/") |
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err = a.params.PostAssetStore.Get(id, buf) |
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switch { |
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if errors.Is(err, post.ErrAssetNotFound) { |
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http.Error(rw, "Asset not found", 404) |
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return |
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} else if err != nil { |
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case strings.HasSuffix(info.id, ".tar.gz"), |
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strings.HasSuffix(info.id, ".tgz"): |
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info.isGzipped = true |
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case strings.HasSuffix(info.id, ".tar"): |
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// ok
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default: |
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// unsupported
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return postAssetArchiveInfo{}, false |
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} |
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return info, true |
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} |
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func (a *api) writePostAsset( |
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rw http.ResponseWriter, |
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r *http.Request, |
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path string, |
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from io.ReadSeeker, |
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) { |
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maxWidth, err := apiutil.StrToInt(r.FormValue("w"), 0) |
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if err != nil { |
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apiutil.BadRequest(rw, r, fmt.Errorf("invalid w parameter: %w", err)) |
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return |
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} |
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if maxWidth == 0 { |
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http.ServeContent(rw, r, path, time.Time{}, from) |
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return |
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} |
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if !isImgResizable(path) { |
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apiutil.BadRequest(rw, r, fmt.Errorf("cannot resize asset %q", path)) |
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return |
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} |
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resizedBuf := new(bytes.Buffer) |
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if err := resizeImage(resizedBuf, from, float64(maxWidth)); err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf( |
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"resizing image %q to size %d: %w", |
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path, maxWidth, err, |
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), |
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) |
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} |
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http.ServeContent( |
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rw, r, path, time.Time{}, bytes.NewReader(resizedBuf.Bytes()), |
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) |
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} |
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func (a *api) handleGetPostAssetArchive( |
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rw http.ResponseWriter, |
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r *http.Request, |
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info postAssetArchiveInfo, |
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) { |
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buf := new(bytes.Buffer) |
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err := a.params.PostAssetStore.Get(info.id, buf) |
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if errors.Is(err, post.ErrAssetNotFound) { |
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http.Error(rw, "asset not found", 404) |
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return |
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} else if err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf("fetching archive asset with id %q: %w", info.id, err), |
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) |
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return |
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} |
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var from io.Reader = buf |
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if info.isGzipped { |
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if from, err = gzip.NewReader(from); err != nil { |
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apiutil.InternalServerError( |
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rw, r, fmt.Errorf("fetching asset with id %q: %w", id, err), |
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rw, r, |
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fmt.Errorf("decompressing archive asset with id %q: %w", info.id, err), |
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) |
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return |
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} |
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} |
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if maxWidth == 0 { |
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tarFS, err := tarfs.New(from) |
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if _, err := io.Copy(rw, buf); err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf( |
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"copying asset with id %q to response writer: %w", |
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id, err, |
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), |
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) |
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} |
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if err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf("reading archive asset with id %q as fs: %w", info.id, err), |
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) |
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return |
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} |
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return |
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} |
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f, err := tarFS.Open(info.subPath) |
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if errors.Is(err, fs.ErrExist) { |
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http.Error(rw, "Asset not found", 404) |
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return |
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if !isImgResizable(id) { |
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apiutil.BadRequest(rw, r, fmt.Errorf("cannot resize file %q", id)) |
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} else if err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf( |
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"opening path %q from archive asset with id %q as fs: %w", |
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info.subPath, info.id, err, |
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), |
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) |
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return |
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} |
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defer f.Close() |
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a.writePostAsset(rw, r, info.path, f) |
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} |
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func (a *api) getPostAssetHandler() http.Handler { |
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) { |
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archiveInfo, ok := extractPostAssetArchiveInfo(r.URL.Path) |
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if ok { |
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a.handleGetPostAssetArchive(rw, r, archiveInfo) |
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return |
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} |
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if err := resizeImage(rw, buf, float64(maxWidth)); err != nil { |
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id := filepath.Base(r.URL.Path) |
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buf := new(bytes.Buffer) |
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err := a.params.PostAssetStore.Get(id, buf) |
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if errors.Is(err, post.ErrAssetNotFound) { |
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http.Error(rw, "Asset not found", 404) |
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return |
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} else if err != nil { |
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apiutil.InternalServerError( |
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rw, r, |
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fmt.Errorf( |
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"resizing image with id %q to size %d: %w", |
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id, maxWidth, err, |
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), |
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rw, r, fmt.Errorf("fetching asset with id %q: %w", id, err), |
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) |
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return |
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} |
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a.writePostAsset(rw, r, id, bytes.NewReader(buf.Bytes())) |
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}) |
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} |
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Brian Picciano
1 year ago