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186 lines
5.0 KiB
Go
186 lines
5.0 KiB
Go
package main
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import (
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"context"
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"crypto/sha256"
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"errors"
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"fmt"
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"image/png"
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"io"
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"log"
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"net/http"
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"github.com/carlmjohnson/requests"
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"github.com/disintegration/imaging"
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"go.goblog.app/app/pkgs/bufferpool"
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)
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const defaultCompressionWidth = 2000
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const defaultCompressionHeight = 3000
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type mediaCompression interface {
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compress(url string, save mediaStorageSaveFunc, hc *http.Client) (location string, err error)
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}
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func (a *goBlog) compressMediaFile(url string) (location string, err error) {
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// Init compressors
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a.compressorsInit.Do(a.initMediaCompressors)
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// Try all compressors until success
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for _, c := range a.compressors {
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location, err = c.compress(url, a.saveMediaFile, a.httpClient)
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if location != "" && err == nil {
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break
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}
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}
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// Return result
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return location, err
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}
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func (a *goBlog) initMediaCompressors() {
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if a.cfg.Micropub == nil || a.cfg.Micropub.MediaStorage == nil {
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return
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}
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config := a.cfg.Micropub.MediaStorage
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if key := config.TinifyKey; key != "" {
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a.compressors = append(a.compressors, &tinify{key})
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}
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if config.CloudflareCompressionEnabled {
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a.compressors = append(a.compressors, &cloudflare{})
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}
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if config.LocalCompressionEnabled {
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a.compressors = append(a.compressors, &localMediaCompressor{})
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}
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}
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type tinify struct {
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key string
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}
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func (tf *tinify) compress(url string, upload mediaStorageSaveFunc, hc *http.Client) (string, error) {
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tinifyErr := errors.New("failed to compress image using tinify")
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// Check url
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fileExtension, allowed := urlHasExt(url, "jpg", "jpeg", "png")
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if !allowed {
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return "", nil
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}
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// Compress
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headers := http.Header{}
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err := requests.
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URL("https://api.tinify.com/shrink").
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Client(hc).
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Method(http.MethodPost).
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BasicAuth("api", tf.key).
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BodyJSON(map[string]any{
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"source": map[string]any{
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"url": url,
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},
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}).
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ToHeaders(headers).
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Fetch(context.Background())
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if err != nil {
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log.Println("Tinify error:", err.Error())
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return "", tinifyErr
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}
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compressedLocation := headers.Get("Location")
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if compressedLocation == "" {
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log.Println("Tinify error: location header missing")
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return "", tinifyErr
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}
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// Resize and download image
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pr, pw := io.Pipe()
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go func() {
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_ = pw.CloseWithError(requests.
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URL(compressedLocation).
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Client(hc).
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Method(http.MethodPost).
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BasicAuth("api", tf.key).
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BodyJSON(map[string]any{
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"resize": map[string]any{
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"method": "fit",
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"width": defaultCompressionWidth,
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"height": defaultCompressionHeight,
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},
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}).
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ToWriter(pw).
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Fetch(context.Background()))
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}()
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// Upload compressed file
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res, err := uploadCompressedFile(fileExtension, pr, upload)
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_ = pr.CloseWithError(err)
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return res, err
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}
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type cloudflare struct{}
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func (*cloudflare) compress(url string, upload mediaStorageSaveFunc, hc *http.Client) (string, error) {
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// Check url
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if _, allowed := urlHasExt(url, "jpg", "jpeg", "png"); !allowed {
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return "", nil
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}
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// Force jpeg
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fileExtension := "jpeg"
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// Compress
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pr, pw := io.Pipe()
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go func() {
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_ = pw.CloseWithError(requests.
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URL(fmt.Sprintf("https://www.cloudflare.com/cdn-cgi/image/f=jpeg,q=75,metadata=none,fit=scale-down,w=%d,h=%d/%s", defaultCompressionWidth, defaultCompressionHeight, url)).
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Client(hc).
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ToWriter(pw).
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Fetch(context.Background()))
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}()
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// Upload compressed file
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res, err := uploadCompressedFile(fileExtension, pr, upload)
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_ = pr.CloseWithError(err)
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return res, err
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}
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type localMediaCompressor struct{}
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func (*localMediaCompressor) compress(url string, upload mediaStorageSaveFunc, hc *http.Client) (string, error) {
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// Check url
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fileExtension, allowed := urlHasExt(url, "jpg", "jpeg", "png")
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if !allowed {
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return "", nil
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}
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// Download and decode image
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pr, pw := io.Pipe()
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go func() {
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_ = pw.CloseWithError(requests.URL(url).Client(hc).ToWriter(pw).Fetch(context.Background()))
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}()
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img, err := imaging.Decode(pr, imaging.AutoOrientation(true))
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_ = pr.CloseWithError(err)
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if err != nil {
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log.Println("Local compressor error:", err.Error())
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return "", errors.New("failed to compress image using local compressor")
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}
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// Resize image
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resizedImage := imaging.Fit(img, defaultCompressionWidth, defaultCompressionHeight, imaging.Lanczos)
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// Encode image
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pr, pw = io.Pipe()
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go func() {
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switch fileExtension {
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case "png":
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_ = pw.CloseWithError(imaging.Encode(pw, resizedImage, imaging.PNG, imaging.PNGCompressionLevel(png.BestCompression)))
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default:
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_ = pw.CloseWithError(imaging.Encode(pw, resizedImage, imaging.JPEG, imaging.JPEGQuality(75)))
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}
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}()
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// Upload compressed file
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res, err := uploadCompressedFile(fileExtension, pr, upload)
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_ = pr.CloseWithError(err)
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return res, err
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}
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func uploadCompressedFile(fileExtension string, r io.Reader, upload mediaStorageSaveFunc) (string, error) {
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// Copy file to temporary buffer to generate hash and filename
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hash := sha256.New()
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tempBuffer := bufferpool.Get()
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defer bufferpool.Put(tempBuffer)
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_, err := io.Copy(io.MultiWriter(tempBuffer, hash), r)
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if err != nil {
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return "", err
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}
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// Upload buffer
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return upload(fmt.Sprintf("%x.%s", hash.Sum(nil), fileExtension), tempBuffer)
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}
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