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feat: add avatar cropping with Cropper.js and server-side resize

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This commit is contained in:
kevin
2026-06-21 02:30:35 +08:00
parent 610ea643ff
commit 67023378ce
7 changed files with 270 additions and 7 deletions
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go.mod
+1
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@@ -48,6 +48,7 @@ require (
github.com/ugorji/go/codec v1.3.1 // indirect
go.mongodb.org/mongo-driver/v2 v2.5.0 // indirect
golang.org/x/arch v0.22.0 // indirect
golang.org/x/image v0.43.0 // indirect
golang.org/x/net v0.55.0 // indirect
golang.org/x/sys v0.46.0 // indirect
golang.org/x/text v0.38.0 // indirect
go.sum
+2
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@@ -111,6 +111,8 @@ golang.org/x/arch v0.22.0 h1:c/Zle32i5ttqRXjdLyyHZESLD/bB90DCU1g9l/0YBDI=
golang.org/x/arch v0.22.0/go.mod h1:dNHoOeKiyja7GTvF9NJS1l3Z2yntpQNzgrjh1cU103A=
golang.org/x/crypto v0.53.0 h1:QZ4Muo8THX6CizN2vPPd5fBGHyogrdK9fG4wLPFUsto=
golang.org/x/crypto v0.53.0/go.mod h1:DNLU434OwVakk9PzuwV8w62mAJpRJL3vsgcfp4Qnsio=
golang.org/x/image v0.43.0 h1:FLxcP4ec2350nTfOC8ysKtqYSIFbk/QGjw1ZHNP4tsY=
golang.org/x/image v0.43.0/go.mod h1:rrpelvGFt+kLPAjPM4HeWPgrl0FtafueU//e5N0qk/Q=
golang.org/x/net v0.55.0 h1:bcvxaJn3e1U6InsFWt1JUq1aSjnRxLzT2rtD2KfkDF8=
golang.org/x/net v0.55.0/go.mod h1:L5U2KuzuOe1lY7Z+aWVIKK6qEeJXnXV9yzGA+WCHJww=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
handlers/profile.go
+95
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@@ -1,7 +1,10 @@
package handlers
import (
"bytes"
"fmt"
"image"
"image/jpeg"
"io"
"net/http"
"os"
@@ -13,6 +16,9 @@ import (
"github.com/gin-gonic/gin"
"gorm.io/gorm"
xdraw "golang.org/x/image/draw"
_ "golang.org/x/image/webp"
"go_blog/models"
)
@@ -147,3 +153,92 @@ func UpdateProfile(db *gorm.DB, storagePath string) gin.HandlerFunc {
c.Redirect(http.StatusFound, "/profile?saved=1")
}
}
// UploadAvatar handles AJAX avatar upload with cropping.
func UploadAvatar(db *gorm.DB, storagePath string) gin.HandlerFunc {
return func(c *gin.Context) {
session := sessions.Default(c)
userID := session.Get("user_id")
var user models.User
if err := db.First(&user, userID).Error; err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "User not found"})
return
}
file, header, err := c.Request.FormFile("avatar")
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "No file provided"})
return
}
defer file.Close()
// Validate extension.
ext := strings.ToLower(filepath.Ext(header.Filename))
if ext == "" || (ext != ".jpg" && ext != ".jpeg" && ext != ".png" && ext != ".gif" && ext != ".webp") {
ext = ".jpg"
}
// Read file bytes for image processing.
imgBytes, err := io.ReadAll(file)
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to read file"})
return
}
// Decode, resize, and re-encode the image.
processedBytes, finalExt, err := processAvatar(imgBytes, ext)
if err != nil {
// Fall back to saving raw bytes if processing fails.
processedBytes = imgBytes
finalExt = ext
}
// Ensure avatar directory exists.
avatarDir := filepath.Join(storagePath, "avatars")
os.MkdirAll(avatarDir, 0755)
// Remove old avatar file.
if user.Avatar != "" {
oldPath := filepath.Join(avatarDir, user.Avatar)
os.Remove(oldPath)
}
// Save processed avatar.
savedName := fmt.Sprintf("%d%s", user.ID, finalExt)
savedPath := filepath.Join(avatarDir, savedName)
if err := os.WriteFile(savedPath, processedBytes, 0644); err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save avatar"})
return
}
// Update user record.
user.Avatar = savedName
db.Save(&user)
// Update session.
session.Set("avatar", savedName)
session.Save()
c.JSON(http.StatusOK, gin.H{"avatar": savedName})
}
}
// processAvatar decodes, resizes to 256x256, and re-encodes an avatar image as JPEG.
func processAvatar(imgBytes []byte, ext string) ([]byte, string, error) {
src, _, err := image.Decode(bytes.NewReader(imgBytes))
if err != nil {
return nil, "", err
}
const targetSize = 256
dst := image.NewRGBA(image.Rect(0, 0, targetSize, targetSize))
xdraw.CatmullRom.Scale(dst, dst.Bounds(), src, src.Bounds(), xdraw.Src, nil)
var buf bytes.Buffer
if err := jpeg.Encode(&buf, dst, &jpeg.Options{Quality: 85}); err != nil {
return nil, "", err
}
return buf.Bytes(), ".jpg", nil
}
i18n/i18n.go
+16
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@@ -83,6 +83,14 @@ var translations = map[Lang]map[string]string{
"gender_male": "Male",
"gender_female": "Female",
"gender_other": "Other",
// Avatar cropping
"crop_avatar_title": "Crop Avatar",
"crop_cancel": "Cancel",
"crop_confirm": "Confirm",
"crop_uploading": "Uploading...",
"crop_success": "Avatar updated.",
"crop_error": "Failed to upload avatar. Please try again.",
},
ZH: {
// 导航
@@ -153,6 +161,14 @@ var translations = map[Lang]map[string]string{
"gender_male": "男",
"gender_female": "女",
"gender_other": "其他",
// 头像裁剪
"crop_avatar_title": "裁剪头像",
"crop_cancel": "取消",
"crop_confirm": "确认",
"crop_uploading": "上传中...",
"crop_success": "头像已更新。",
"crop_error": "头像上传失败，请重试。",
},
}
main.go
+1
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@@ -64,6 +64,7 @@ func main() {
{
profile.GET("", handlers.ProfilePage(db))
profile.POST("", handlers.UpdateProfile(db, cfg.Path))
profile.POST("/avatar", handlers.UploadAvatar(db, cfg.Path))
}
// 9. Start the server.
templates/layouts/base.html
+2
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@@ -6,6 +6,8 @@
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>{{.Title}} - {{index .Tr "site_title"}}</title>
<script src="https://cdn.tailwindcss.com"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.6.2/cropper.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/cropperjs/1.6.2/cropper.min.js"></script>
</head>
<body class="bg-gray-50 min-h-screen flex flex-col">
<!-- Navigation -->
templates/pages/profile.html
+153 -7
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@@ -15,24 +15,47 @@
</div>
{{end}}
<!-- Avatar Crop Modal -->
<div id="avatarCropModal" class="fixed inset-0 z-50 hidden items-center justify-center bg-black/50">
<div class="bg-white rounded-xl shadow-xl max-w-lg w-full mx-4 p-6">
<h3 class="text-lg font-semibold text-gray-800 mb-4">{{index .Tr "crop_avatar_title"}}</h3>
<div class="max-h-64 overflow-hidden mb-4 flex items-center justify-center bg-gray-100">
<img id="avatarCropImage" src="" alt="crop preview" class="max-w-full block">
</div>
<div class="flex gap-3 justify-end">
<button type="button" id="cropCancelBtn"
class="px-4 py-2 rounded-lg border border-gray-300 text-gray-700 hover:bg-gray-100 transition-colors cursor-pointer">
{{index .Tr "crop_cancel"}}
</button>
<button type="button" id="cropConfirmBtn"
class="px-4 py-2 rounded-lg bg-blue-600 text-white hover:bg-blue-700 transition-colors cursor-pointer">
{{index .Tr "crop_confirm"}}
</button>
</div>
</div>
</div>
<form action="/profile" method="post" enctype="multipart/form-data" class="space-y-8">
<!-- Avatar Section -->
<div class="bg-white rounded-xl shadow-sm border border-gray-200 p-6">
<h3 class="text-lg font-semibold text-gray-800 mb-4">{{index .Tr "profile_avatar"}}</h3>
<div class="flex items-center gap-5">
<div class="w-20 h-20 rounded-full overflow-hidden border-2 border-gray-300 flex items-center justify-center bg-gray-200">
<div id="avatarPreviewContainer" class="w-20 h-20 rounded-full overflow-hidden border-2 border-gray-300 flex items-center justify-center bg-gray-200">
{{if .Profile.Avatar}}
<img src="/uploads/avatars/{{.Profile.Avatar}}" alt="avatar" class="w-full h-full object-cover">
<img id="avatarPreviewImg" src="/uploads/avatars/{{.Profile.Avatar}}" alt="avatar" class="w-full h-full object-cover">
{{else}}
<svg class="w-10 h-10 text-gray-500" fill="currentColor" viewBox="0 0 24 24">
<svg id="avatarPreviewSvg" class="w-10 h-10 text-gray-500" fill="currentColor" viewBox="0 0 24 24">
<path d="M12 12c2.7 0 4.8-2.1 4.8-4.8S14.7 2.4 12 2.4 7.2 4.5 7.2 7.2 9.3 12 12 12zm0 2.4c-3.2 0-9.6 1.6-9.6 4.8v1.2c0 .66.54 1.2 1.2 1.2h16.8c.66 0 1.2-.54 1.2-1.2v-1.2c0-3.2-6.4-4.8-9.6-4.8z"/>
</svg>
{{end}}
</div>
<label class="cursor-pointer bg-gray-200 text-gray-700 px-4 py-2 rounded-lg font-medium hover:bg-gray-300 transition-colors text-sm">
{{index .Tr "profile_change_avatar"}}
<input type="file" name="avatar" accept="image/*" class="hidden" onchange="this.form.submit()">
</label>
<div>
<label class="cursor-pointer bg-gray-200 text-gray-700 px-4 py-2 rounded-lg font-medium hover:bg-gray-300 transition-colors text-sm">
{{index .Tr "profile_change_avatar"}}
<input type="file" id="avatarFileInput" name="avatar" accept="image/*" class="hidden">
</label>
<div id="avatarUploadStatus" class="mt-2 text-sm text-gray-500 hidden"></div>
</div>
</div>
</div>
@@ -96,4 +119,127 @@
</section>
{{template "footer" .}}
<script>
(function() {
var cropper = null;
var fileInput = document.getElementById('avatarFileInput');
var modal = document.getElementById('avatarCropModal');
var cropImage = document.getElementById('avatarCropImage');
var cancelBtn = document.getElementById('cropCancelBtn');
var confirmBtn = document.getElementById('cropConfirmBtn');
var statusDiv = document.getElementById('avatarUploadStatus');
var previewContainer = document.getElementById('avatarPreviewContainer');
// i18n strings from template
var i18nCropError = "{{index .Tr "crop_error"}}";
var i18nCropUploading = "{{index .Tr "crop_uploading"}}";
var i18nCropSuccess = "{{index .Tr "crop_success"}}";
var i18nCropConfirm = "{{index .Tr "crop_confirm"}}";
fileInput.addEventListener('change', function() {
var file = this.files[0];
if (!file) return;
if (!file.type.match(/^image\/(jpeg|png|gif|webp)$/)) {
showStatus(i18nCropError, 'red');
this.value = '';
return;
}
var reader = new FileReader();
reader.onload = function(e) {
cropImage.src = e.target.result;
modal.classList.remove('hidden');
modal.classList.add('flex');
if (cropper) cropper.destroy();
cropper = new Cropper(cropImage, {
aspectRatio: 1,
viewMode: 1,
autoCropArea: 0.85,
responsive: true
});
};
reader.readAsDataURL(file);
});
cancelBtn.addEventListener('click', function() {
if (cropper) { cropper.destroy(); cropper = null; }
modal.classList.add('hidden');
modal.classList.remove('flex');
fileInput.value = '';
});
confirmBtn.addEventListener('click', function() {
if (!cropper) return;
confirmBtn.disabled = true;
confirmBtn.textContent = i18nCropUploading;
showStatus(i18nCropUploading, 'gray');
var canvas = cropper.getCroppedCanvas({
width: 256,
height: 256,
maxWidth: 512,
maxHeight: 512,
imageSmoothingEnabled: true,
imageSmoothingQuality: 'high'
});
canvas.toBlob(function(blob) {
var formData = new FormData();
formData.append('avatar', blob, 'avatar.jpg');
fetch('/profile/avatar', {
method: 'POST',
body: formData,
credentials: 'same-origin'
})
.then(function(res) { return res.json(); })
.then(function(data) {
if (data.avatar) {
var ts = Date.now();
var avatarUrl = '/uploads/avatars/' + data.avatar + '?t=' + ts;
// Update profile page preview
previewContainer.innerHTML =
'<img src="' + avatarUrl + '" alt="avatar" class="w-full h-full object-cover">';
// Update nav bar avatar
var navAvatarBtn = document.getElementById('avatarBtn');
if (navAvatarBtn) {
navAvatarBtn.innerHTML =
'<img src="' + avatarUrl + '" alt="avatar" class="w-full h-full object-cover">';
}
showStatus(i18nCropSuccess, 'green');
} else {
showStatus(data.error || i18nCropError, 'red');
}
})
.catch(function() {
showStatus(i18nCropError, 'red');
})
.finally(function() {
if (cropper) { cropper.destroy(); cropper = null; }
modal.classList.add('hidden');
modal.classList.remove('flex');
fileInput.value = '';
confirmBtn.disabled = false;
confirmBtn.textContent = i18nCropConfirm;
});
}, 'image/jpeg', 0.92);
});
function showStatus(msg, color) {
statusDiv.textContent = msg;
statusDiv.classList.remove('hidden', 'text-gray-500', 'text-green-600', 'text-red-600');
if (color === 'green') statusDiv.classList.add('text-green-600');
else if (color === 'red') statusDiv.classList.add('text-red-600');
else statusDiv.classList.add('text-gray-500');
}
})();
</script>
{{end}}