Media Proxy

Optional S3 result storage

Set these environment variables to enable persistent result caching in S3/MinIO. If an object exists, it will be served directly without reprocessing.

S3_ENABLED (bool) — enable S3 storage, default false
S3_ENDPOINT — e.g. play.min.io:9000 or your MinIO/S3 endpoint
S3_ACCESS_KEY_ID
S3_SECRET_ACCESS_KEY
S3_BUCKET — target bucket
S3_SSL (bool) — default true for S3, false for plain MinIO if needed
S3_PREFIX — optional key prefix, e.g. media-proxy/

MinIO Go SDK is used under the hood. See the official docs: minio/minio-go.

A high-performance media proxy service built with Go and Fiber that provides secure proxying for images and video preview generation. This service allows you to proxy media content from allowed origins while maintaining security and performance.

Features

Image Proxying: Proxy images from allowed origins with optional quality control, WebP conversion, resizing, and rescaling
WebP Conversion: Convert any supported image format to WebP with quality optimization
Video Preview Generation: Extract frame thumbnails from video files at specific positions (first, middle, last, or custom time)
Origin Validation: Whitelist-based origin control for security
MIME Type Validation: Strict content type checking for both images and videos
Health Checks: Built-in health check endpoint
Compression: Automatic response compression
Structured Logging: JSON-formatted logging with Zap
Path-based Parameters: Clean URL structure with parameters in the path
HMAC Signatures: Optional URL signing for enhanced security
Image Upload: Direct image upload with processing capabilities

Supported Media Types

Images

JPEG (image/jpeg)
PNG (image/png)
WebP (image/webp)
GIF (image/gif)
BMP (image/bmp)
TIFF (image/tiff)
AVIF (image/avif)

Documents

PDF (application/pdf)
EPUB (application/epub+zip)
MOBI (application/x-mobipocket-ebook)
DOCX (application/vnd.openxmlformats-officedocument.wordprocessingml.document)
XLSX (application/vnd.openxmlformats-officedocument.spreadsheetml.sheet)
PPTX (application/vnd.openxmlformats-officedocument.presentationml.presentation)

Videos

MP4 (video/mp4)
OGG (video/ogg)
WebM (video/webm)
QuickTime (video/quicktime)
AVI (video/x-msvideo)
Matroska (video/x-matroska)
FLV (video/x-flv)
M4V (video/x-m4v)

Installation

Prerequisites

Go 1.24 or later
FFmpeg libraries (for video processing)

Clone and Build

git clone <repository-url>cd media-proxy
go mod download
go build -o media-proxy

Docker

docker build -t media-proxy .
docker run -p 3000:3000 -e APP_ALLOWED_ORIGINS=example.com,cdn.example.com media-proxy

Configuration

The service is configured via environment variables:

Variable	Description	Required	Default
`APP_ALLOWED_ORIGINS`	Comma-separated list of allowed hostnames	No	Empty (allows all)
`APP_ADDRESS`	Address to listen on	No	`:3000`
`APP_PREFORK`	Enable preforking	No	`false`
`APP_METRICS`	Enable metrics	No	`true`
`APP_WEBP`	Default to WebP conversion	No	`false`
`APP_CACHE_TTL_SECONDS`	Cache TTL in seconds	No	`1800` (30 minutes)
`APP_CACHE_MAX_COST`	Cache max cost in bytes	No	`1073741824` (1GB)
`APP_CACHE_NUM_COUNTERS`	Cache num counters	No	`10000000` (10M)
`APP_CACHE_BUFFER_ITEMS`	Cache buffer items	No	`64`
`APP_TOKEN`	Token for image upload authentication	No	Empty
`APP_HMAC_KEY`	HMAC key for URL signing	No	Empty
`APP_UPLOADING_ENABLED`	Enable video uploading to S3	No	`false`
`APP_CHUNK_SIZE`	Chunk size for multi-part uploads (bytes)	No	`83886080` (80MB)
`REDIS_ENABLED`	Enable Redis for multi-part upload tracking	No	`false`
`REDIS_ADDR`	Redis server address	No	`localhost:6379`
`REDIS_PASSWORD`	Redis password	No	Empty
`REDIS_DB`	Redis database number	No	`0`

Example Configuration

export APP_ALLOWED_ORIGINS="example.com,cdn.example.com,media.example.org"export APP_TOKEN="your-upload-token"export APP_HMAC_KEY="your-hmac-secret-key"export APP_UPLOADING_ENABLED=true # Enable video uploads# Optional: Redis for multi-part upload trackingexport REDIS_ENABLED=true
export REDIS_ADDR="localhost:6379"export REDIS_PASSWORD=""export REDIS_DB=0
export APP_CHUNK_SIZE=83886080 # 80MB chunks

API Endpoints

Health Check

GET /health

Returns the health status of the service.

Image Proxy

New Path-based Format (Recommended)

GET /images/q:<quality>/w:<width>/h:<height>/s:<scale>/i:<interpolation>/webp/sig:<signature>/{base64-encoded-url}

Path Parameters:

q or quality: Image quality for optimization (1-100, default: 100)
w or width: Width of the image (default: 0)
h or height: Height of the image (default: 0)
s or scale: Scale factor for the image (0-1, default: 0)
i or interpolation: Interpolation method for resizing (0-5, default: 5)
webp: Force conversion to WebP format (flag, no value needed)
sig or signature: HMAC signature for URL validation (optional)
{base64-encoded-url}: Base64 URL-encoded image URL (required)

Interpolation methods:

0: Nearest-neighbor interpolation
1: Bilinear interpolation
2: Bicubic interpolation
3: Mitchell-Netravali interpolation
4: Lanczos2 interpolation
5: Lanczos3 interpolation

Examples:

# Basic image proxy (original format)
curl "http://localhost:3000/images/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc="# Convert to WebP with quality optimization
curl "http://localhost:3000/images/q:85/webp/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc="# Resize image with specific dimensions
curl "http://localhost:3000/images/w:800/h:600/q:90/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc="# Rescale image with custom interpolation
curl "http://localhost:3000/images/s:0.5/i:2/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc="# With HMAC signature for security
curl "http://localhost:3000/images/sig:abc123/q:75/webp/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc="

Video Preview

Path-based Format

GET /videos/preview/q:<quality>/w:<width>/h:<height>/s:<scale>/i:<interpolation>/fp:<framePosition>/webp/sig:<signature>/{base64-encoded-url}

Path Parameters:

q or quality: Image quality for optimization (1-100, default: 100)
w or width: Width of the image (default: 0)
h or height: Height of the image (default: 0)
s or scale: Scale factor for the image (0-1, default: 0)
i or interpolation: Interpolation method for resizing (0-5, default: 5)
fp or framePosition: Frame position to extract (default: "first")
webp: Force conversion to WebP format (flag, no value needed)
sig or signature: HMAC signature for URL validation (optional)
{base64-encoded-url}: Base64 URL-encoded video URL (required)

Frame Position Options:

first: Extract the first frame (default)
half: Extract a frame from the middle of the video
last: Extract the last frame
30.5: Extract a frame at 30.5 seconds (supports decimal seconds)

Examples:

# Basic video preview (first frame)
curl "http://localhost:3000/videos/preview/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ="# Video preview from the middle of the video
curl "http://localhost:3000/videos/preview/fp:half/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ="# Video preview from the last frame
curl "http://localhost:3000/videos/preview/fp:last/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ="# Video preview from 30 seconds into the video
curl "http://localhost:3000/videos/preview/fp:30/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ="# Video preview from the middle with resizing and WebP conversion
curl "http://localhost:3000/videos/preview/fp:half/w:320/h:240/q:85/webp/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ="

Response:

Returns a JPEG or WebP thumbnail of the extracted frame
Content-Type: image/jpeg or image/webp (if WebP conversion is enabled)
Cache-Control: public, max-age=3600
Validates that the URL origin is in the allowed list
Validates that the content type is a supported video format

Video Proxy

Path-based Format

GET /videos/sig:<signature>/{base64-encoded-url}

Path Parameters:

sig or signature: HMAC signature for URL validation (optional for HTTP/HTTPS origins, required for S3 explicit locations)
{base64-encoded-url}: Base64 URL-encoded video URL or S3 location (required)

Features:

Supports HTTP Range requests for video streaming (partial content)
Proxies raw video bytes from HTTP/HTTPS origins
Supports proxying from S3/MinIO storage (if explicit location provided)
Forwards relevant headers (Content-Type, Accept-Ranges, Content-Length, Content-Range)
Returns appropriate HTTP status codes (200 OK or 206 Partial Content)

Examples:

# Proxy video from HTTP origin
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-o video.mp4
# Proxy video with Range request (first 1MB)
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-H "Range: bytes=0-1048575" \
-o video_partial.mp4
# Proxy video from S3 location (requires signature)
curl "http://localhost:3000/videos/sig:abc123/aHR0cHM6Ly9zMy5hbWF6b25hd3MuY29tL2J1Y2tldC92aWRlby5tcDQ=" \
-o video.mp4

Response:

Returns raw video bytes
Content-Type: Original video content type (e.g., video/mp4)
Accept-Ranges: bytes
Supports Content-Range header for partial content responses (206 Partial Content)
Validates that the URL origin is in the allowed list (for HTTP/HTTPS origins)
Validates HMAC signature for S3 explicit locations

Video Upload

Upload videos directly to S3 storage with secure signature-based authentication.

Configuration

export APP_UPLOADING_ENABLED=true
export APP_HMAC_KEY="your-secret-hmac-key"export S3_ENABLED=true
export S3_ENDPOINT="s3.amazonaws.com"export S3_ACCESS_KEY_ID="your-access-key"export S3_SECRET_ACCESS_KEY="your-secret-key"export S3_BUCKET="your-bucket"export S3_SSL=true
export APP_MAX_VIDEO_SIZE_MB=100

Endpoint

POST /videos?deadline={unix_timestamp}&location={base64_location}&signature={hmac_signature}

Query Parameters:

deadline: Unix timestamp when the upload permission expires (required)
location: Base64 URL-safe encoded S3 object key where the video will be stored (required)
signature: HMAC-SHA256 signature of deadline|location (required)

Form Data:

video: The video file to upload (required)

Response (201 Created):

{
"location": "videos/user123/my-video.mp4",
"size": 1048576
}

Generate Upload Signature (Node.js)

constcrypto=require('crypto');functiongenerateVideoUploadSignature(hmacKey,deadline,location){// Create message: deadline|locationconstmessage=`${deadline}|${location}`;// Generate HMAC-SHA256 signatureconsthmac=crypto.createHmac('sha256',hmacKey);hmac.update(message);constsignature=hmac.digest('hex');// Encode location in base64 URL-safe formatconstlocationEncoded=Buffer.from(location).toString('base64').replace(/\+/g,'-').replace(/\//g,'_').replace(/=/g,'');return{ signature, locationEncoded, deadline };}// UsageconsthmacKey=process.env.APP_HMAC_KEY;constdeadline=Math.floor(Date.now()/1000)+(5*60);// 5 minutesconstlocation='videos/user123/my-video.mp4';const{ signature, locationEncoded }=generateVideoUploadSignature(hmacKey,deadline,location);console.log(`deadline=${deadline}`);console.log(`location=${locationEncoded}`);console.log(`signature=${signature}`);

Upload Video Example

# Using cURL
curl -X POST \
"http://localhost:3000/videos?deadline=1730678400&location=dmlkZW9zL3VzZXIxMjMvbXktdmlkZW8ubXA0&signature=abc123..." \
-F "video=@/path/to/video.mp4"

// Using JavaScript/Fetch APIconstformData=newFormData();formData.append('video',videoFile);constuploadUrl=newURL('http://localhost:3000/videos');uploadUrl.searchParams.set('deadline',deadline);uploadUrl.searchParams.set('location',locationEncoded);uploadUrl.searchParams.set('signature',signature);constresponse=awaitfetch(uploadUrl,{method: 'POST',body: formData});constresult=awaitresponse.json();console.log('Upload result:',result);// Output: { success: true, location: "videos/user123/my-video.mp4", size: 1048576 }

Security Features

Deadline-based expiration: Upload permissions expire after the specified deadline
HMAC signature validation: Prevents unauthorized uploads
S3 location control: Videos are uploaded to predetermined S3 paths
MIME type validation: Only video files are accepted
File size limits: Configure APP_MAX_VIDEO_SIZE_MB to prevent large uploads
Path sanitization: Prevents directory traversal and invalid characters

For more details, see VIDEO_UPLOAD.md.

Multi-Part Video Upload

For large video files, the service supports multi-part uploads with progress tracking via Redis.

For detailed documentation including API endpoints, parameters, examples, and security model, see MULTIPART_UPLOAD.md.

URL Encoding for Path-based Format

For the new path-based format, you need to base64 URL-encode your image/video URLs:

# Example URL encodingecho -n "https://example.com/image.jpg"| base64 -w 0 | sed 's/+/-/g'| sed 's/\//_/g'| sed 's/=//g'# Result: aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc

HMAC Signature Generation

To generate HMAC signatures for secure URL validation:

# Using OpenSSLecho -n "https://example.com/image.jpg"| openssl dgst -sha256 -hmac "your-hmac-key" -binary | xxd -p
# Using Python
python3 -c "import hmacimport hashliburl = 'https://example.com/image.jpg'key = 'your-hmac-key'signature = hmac.new(key.encode(), url.encode(), hashlib.sha256).hexdigest()print(signature)"

Usage Examples

Basic Image Proxying

# Path-based format (recommended)
curl "http://localhost:3000/images/q:85/webp/aHR0cHM6Ly9leGFtcGxlLmNvbS9waG90by5qcGc="

Video Preview Generation

# Path-based format - first frame
curl "http://localhost:3000/videos/preview/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-H "Accept: image/jpeg" \
-o thumbnail.jpg
# Path-based format - frame from middle of video
curl "http://localhost:3000/videos/preview/fp:half/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-H "Accept: image/jpeg" \
-o thumbnail.jpg

Video Proxying

# Proxy full video
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-o video.mp4
# Proxy video with Range request
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" \
-H "Range: bytes=0-1048575" \
-o video_partial.mp4

Image Upload

# Path-based format
curl -X POST "http://localhost:3000/images/q:90/webp/t:your-token/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc=" \
--data-binary @image.jpg

Video Upload

# Generate signature (Node.js example)
node -e "const crypto = require('crypto');const hmacKey = 'your-secret-hmac-key';const deadline = Math.floor(Date.now() / 1000) + 300; // 5 minutesconst location = 'videos/user123/my-video.mp4';const message = \`\${deadline}|\${location}\`;const signature = crypto.createHmac('sha256', hmacKey).update(message).digest('hex');const locationEncoded = Buffer.from(location).toString('base64').replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');console.log(\`deadline=\${deadline}&location=\${locationEncoded}&signature=\${signature}\`);"# Upload video using generated parameters
curl -X POST \
"http://localhost:3000/videos?deadline=1730678400&location=dmlkZW9zL3VzZXIxMjMvbXktdmlkZW8ubXA0&signature=abc123..." \
-F "video=@video.mp4"

HTML Integration

<!-- Path-based format (recommended) --><imgsrc="http://localhost:3000/images/q:80/webp/aHR0cHM6Ly9leGFtcGxlLmNvbS9pbWFnZS5qcGc=" alt="WebP optimized image"><!-- Video thumbnail --><imgsrc="http://localhost:3000/videos/preview/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" alt="Video thumbnail"><!-- Video thumbnail from middle of video --><imgsrc="http://localhost:3000/videos/preview/fp:half/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" alt="Video thumbnail from middle"><!-- Video proxy for HTML5 video player --><videocontrols><sourcesrc="http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS92aWRlby5tcDQ=" type="video/mp4"></video>

Security Features

Origin Validation: Only URLs from configured allowed origins are processed
MIME Type Validation: Strict content type checking prevents processing of non-media files
URL Parsing: Robust URL validation prevents malformed requests
No Direct File Access: Service only processes HTTP/HTTPS URLs
HMAC Signatures: Optional URL signing for enhanced security
Token Authentication: Required authentication for image upload operations

Development

Running Locally

# Set environment variablesexport APP_ALLOWED_ORIGINS="localhost,127.0.0.1,example.com"export APP_TOKEN="your-upload-token"export APP_HMAC_KEY="your-hmac-secret-key"# Run the service
go run .

The service will start on port 3000.

Testing

# Test path-based image proxy
curl "http://localhost:3000/images/aHR0cHM6Ly9odHRwYmluLm9yZy9pbWFnZS9qcGVn"# Test path-based video preview (first frame)
curl "http://localhost:3000/videos/preview/aHR0cHM6Ly9leGFtcGxlLmNvbS9zYW1wbGUubXA0"# Test path-based video preview (middle frame)
curl "http://localhost:3000/videos/preview/fp:half/aHR0cHM6Ly9leGFtcGxlLmNvbS9zYW1wbGUubXA0"# Test video proxy
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS9zYW1wbGUubXA0" \
-o test_video.mp4
# Test video proxy with Range request
curl "http://localhost:3000/videos/aHR0cHM6Ly9leGFtcGxlLmNvbS9zYW1wbGUubXA0" \
-H "Range: bytes=0-1048575" \
-o test_video_partial.mp4
# Test health check
curl "http://localhost:3000/health"

License

Media-server is licensed under the GNU Affero General Public License v3.0 and as commercial software. For commercial licensing, please contact us at sales@nnstd.dev.

Name		Name	Last commit message	Last commit date
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.github/workflows		.github/workflows
.idea		.idea
client		client
config		config
docs		docs
example		example
metrics		metrics
middlewares/prometheus		middlewares/prometheus
pool		pool
routes		routes
storage		storage
validation		validation
.gitignore		.gitignore
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
go.mod		go.mod
go.sum		go.sum
main.go		main.go

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Media Proxy

Optional S3 result storage

Features

Supported Media Types

Images

Documents

Videos

Installation

Prerequisites

Clone and Build

Docker

Configuration

Example Configuration

API Endpoints

Health Check

Image Proxy

New Path-based Format (Recommended)

Video Preview

Path-based Format

Video Proxy

Path-based Format

Video Upload

Configuration

Endpoint

Generate Upload Signature (Node.js)

Upload Video Example

Security Features

Multi-Part Video Upload

URL Encoding for Path-based Format

HMAC Signature Generation

Usage Examples

Basic Image Proxying

Video Preview Generation

Video Proxying

Image Upload

Video Upload

HTML Integration

Security Features

Development

Running Locally

Testing

License

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