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images.go
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images.go
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package core
import (
"bytes"
"encoding/base64"
"fmt"
"image"
_ "image/gif"
jpeg "image/jpeg"
_ "image/png"
"io"
"io/ioutil"
"net/http"
netUrl "net/url"
"os"
"path"
"strings"
"time"
ipath "gx/ipfs/QmQAgv6Gaoe2tQpcabqwKXKChp2MZ7i3UXv9DqTTaxCaTR/go-path"
cid "gx/ipfs/QmTbxNB1NwDesLmKTscr4udL2tVP7MaxvXnD1D9yX7g3PN/go-cid"
"github.com/OpenBazaar/openbazaar-go/ipfs"
"github.com/OpenBazaar/openbazaar-go/pb"
"github.com/OpenBazaar/openbazaar-go/repo"
"github.com/disintegration/imaging"
)
// SetAvatarImages - set avatar image from the base64 encoded image string
func (n *OpenBazaarNode) SetAvatarImages(base64ImageData string) (*pb.Profile_Image, error) {
imageHashes, err := n.resizeImage(base64ImageData, "avatar", 60, 60)
if err != nil {
return nil, err
}
profile, err := n.GetProfile()
if err != nil {
return nil, err
}
profile.AvatarHashes = imageHashes
err = n.UpdateProfile(&profile)
if err != nil {
return nil, err
}
return imageHashes, nil
}
// SetHeaderImages - set header image from the base64 encoded string
func (n *OpenBazaarNode) SetHeaderImages(base64ImageData string) (*pb.Profile_Image, error) {
imageHashes, err := n.resizeImage(base64ImageData, "header", 315, 90)
if err != nil {
return nil, err
}
profile, err := n.GetProfile()
if err != nil {
return nil, err
}
profile.HeaderHashes = imageHashes
err = n.UpdateProfile(&profile)
if err != nil {
return nil, err
}
return imageHashes, nil
}
// SetProductImages - use the original image ina base64 string format and generate tiny,
// small, medium and large images for the product
func (n *OpenBazaarNode) SetProductImages(base64ImageData, filename string) (*pb.Profile_Image, error) {
return n.resizeImage(base64ImageData, filename, 120, 120)
}
func (n *OpenBazaarNode) resizeImage(base64ImageData, filename string, baseWidth, baseHeight int) (*pb.Profile_Image, error) {
img, err := decodeImageData(base64ImageData)
if err != nil {
return nil, err
}
imgPath := path.Join(n.RepoPath, "root", "images")
t, err := n.addResizedImage(img, 1*baseWidth, 1*baseHeight, path.Join(imgPath, "tiny", filename))
if err != nil {
return nil, err
}
s, err := n.addResizedImage(img, 2*baseWidth, 2*baseHeight, path.Join(imgPath, "small", filename))
if err != nil {
return nil, err
}
m, err := n.addResizedImage(img, 4*baseWidth, 4*baseHeight, path.Join(imgPath, "medium", filename))
if err != nil {
return nil, err
}
l, err := n.addResizedImage(img, 8*baseWidth, 8*baseHeight, path.Join(imgPath, "large", filename))
if err != nil {
return nil, err
}
o, err := n.addImage(img, path.Join(imgPath, "original", filename))
if err != nil {
return nil, err
}
return &pb.Profile_Image{Tiny: t, Small: s, Medium: m, Large: l, Original: o}, nil
}
func (n *OpenBazaarNode) addImage(img image.Image, imgPath string) (string, error) {
out, err := os.Create(imgPath)
if err != nil {
return "", err
}
err = jpeg.Encode(out, img, nil)
if err != nil {
return "", err
}
out.Close()
return ipfs.AddFile(n.IpfsNode, imgPath)
}
func (n *OpenBazaarNode) addResizedImage(img image.Image, w, h int, imgPath string) (string, error) {
width, height := getImageAttributes(w, h, img.Bounds().Max.X, img.Bounds().Max.Y)
newImg := imaging.Resize(img, width, height, imaging.Lanczos)
return n.addImage(newImg, imgPath)
}
func decodeImageData(base64ImageData string) (image.Image, error) {
reader := base64.NewDecoder(base64.StdEncoding, strings.NewReader(base64ImageData))
img, err := imaging.Decode(reader, imaging.AutoOrientation(true))
if err != nil {
return nil, err
}
return img, err
}
func getImageAttributes(targetWidth, targetHeight, imgWidth, imgHeight int) (width, height int) {
targetRatio := float32(targetWidth) / float32(targetHeight)
imageRatio := float32(imgWidth) / float32(imgHeight)
var h, w float32
if imageRatio > targetRatio {
h = float32(targetHeight)
w = float32(targetHeight) * imageRatio
} else {
w = float32(targetWidth)
h = float32(targetWidth) * (float32(imgHeight) / float32(imgWidth))
}
return int(w), int(h)
}
// FetchAvatar - fetch image avatar from ipfs
func (n *OpenBazaarNode) FetchAvatar(peerID string, size string, useCache bool) (io.ReadSeeker, error) {
return n.FetchImage(peerID, "avatar", size, useCache)
}
// FetchHeader - fetch image header from ipfs
func (n *OpenBazaarNode) FetchHeader(peerID string, size string, useCache bool) (io.ReadSeeker, error) {
return n.FetchImage(peerID, "header", size, useCache)
}
// FetchImage - fetch ipfs image
func (n *OpenBazaarNode) FetchImage(peerID string, imageType string, size string, useCache bool) (io.ReadSeeker, error) {
query := "/" + peerID + "/images/" + size + "/" + imageType
b, err := ipfs.ResolveThenCat(n.IpfsNode, ipath.FromString(query), time.Minute, n.IPNSQuorumSize, useCache)
if err != nil {
return nil, err
}
return bytes.NewReader(b), nil
}
// GetBase64Image - fetch the image and return it as base64 encoded string
func (n *OpenBazaarNode) GetBase64Image(url string) (base64ImageData, filename string, err error) {
var client *http.Client
if n.TorDialer != nil {
tbTransport := &http.Transport{Dial: n.TorDialer.Dial}
client = &http.Client{Transport: tbTransport, Timeout: time.Second * 30}
} else {
client = &http.Client{Timeout: time.Second * 30}
}
resp, err := client.Get(url)
if err != nil {
return "", "", err
}
imgBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
return "", "", err
}
img := base64.StdEncoding.EncodeToString(imgBytes)
u, err := netUrl.Parse(url)
if err != nil {
return "", "", err
}
_, filename = path.Split(u.Path)
return img, filename, nil
}
// maybeMigrateImageHashes will iterate over the listing's images and migrate them
// to a v0 cid if they are not already v0.
func (n *OpenBazaarNode) maybeMigrateImageHashes(listing *repo.Listing) error {
for _, i := range listing.GetImages() {
var updateHash = func(size, currentHash string, update func(string) error) error {
var cidVer = uint64(1) // if version is unknown, always attempt to update hash
if id, err := cid.Decode(currentHash); err == nil {
cidVer = id.Version()
}
if cidVer > 0 {
var imgPath = path.Join(n.RepoPath, "root", "images", size, i.GetFilename())
iHash, err := ipfs.AddFile(n.IpfsNode, imgPath)
if err != nil {
return fmt.Errorf("ipfs add (%s): %s", imgPath, err.Error())
}
if err := update(iHash); err != nil {
return fmt.Errorf("set %s img hash: %s", size, err.Error())
}
}
return nil
}
if err := updateHash("tiny", i.GetTiny(), i.SetTiny); err != nil {
return err
}
if err := updateHash("small", i.GetSmall(), i.SetSmall); err != nil {
return err
}
if err := updateHash("medium", i.GetMedium(), i.SetMedium); err != nil {
return err
}
if err := updateHash("large", i.GetLarge(), i.SetLarge); err != nil {
return err
}
if err := updateHash("original", i.GetOriginal(), i.SetOriginal); err != nil {
return err
}
}
return nil
}