test-skill-1（测试技能 1）

Remove Background — Transparent PNG with AI

Remove image backgrounds to produce a transparent PNG. Uses Bria's RMBG-2.0 model — commercially safe and production ready.

Setup — Authentication

Before making any API call, you need a valid Bria access token.

Set the auth server URL from the metadata above (or override if instructed):

BRIA_AUTH_SERVER="${BRIA_AUTH_SERVER:-https://auth.bria.ai}"

Step 1: Check for existing credentials

if [ -f ~/.bria/credentials ]; then
  BRIA_API_KEY=$(python3 -c "import json; print(json.load(open('$HOME/.bria/credentials'))['access_token'])" 2>/dev/null)
fi
if [ -z "$BRIA_API_KEY" ]; then
  echo "NO_CREDENTIALS"
else
  echo "BRIA_API_KEY is set"
fi

If the output is BRIA_API_KEY is set, skip to Remove Background below. If the API key is rejected by the Bria API later, delete ~/.bria/credentials and restart from Step 2.

Step 2: Authenticate via device authorization

If no credentials are found, start the device authorization flow.

2a. Request a device code:

DEVICE_RESPONSE=$(curl -s -X POST "$BRIA_AUTH_SERVER/device/authorize" \
  -H "Content-Type: application/json")
echo "$DEVICE_RESPONSE"

Parse the response fields:

• device_code — used to poll for the token (keep this, don't show to user)
• user_code — the code the user must enter (e.g. BRIA-XXXX)
• verification_uri — the URL the user must visit
• interval — seconds between poll attempts

2b. Show the user the code and link. Tell them:

To connect your Bria account, open this link and enter the code shown: {verification_uri_complete} Or go to {verification_uri} and enter code: {user_code}

2c. Poll for the token. After showing the user the code, immediately start polling. Try up to 60 times with the given interval (default 5 seconds):

for i in $(seq 1 60); do
  TOKEN_RESPONSE=$(curl -s -X POST "$BRIA_AUTH_SERVER/token" \
    -d "grant_type=urn:ietf:params:oauth:grant-type:device_code" \
    -d "device_code=$DEVICE_CODE")
  ACCESS_TOKEN=$(echo "$TOKEN_RESPONSE" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('access_token',''))" 2>/dev/null)
  if [ -n "$ACCESS_TOKEN" ] && [ "$ACCESS_TOKEN" != "" ]; then
    # Resolve the bearer token to a real Bria API key via introspection
    INTROSPECT=$(curl -s -X POST "$BRIA_AUTH_SERVER/token/introspect" \
      -d "token=$ACCESS_TOKEN")
    REAL_API_KEY=$(echo "$INTROSPECT" | python3 -c "import sys,json; print(json.load(sys.stdin).get('api_token',''))" 2>/dev/null)
    if [ -n "$REAL_API_KEY" ] && [ "$REAL_API_KEY" != "" ]; then
      BRIA_API_KEY="$REAL_API_KEY"
    else
      BRIA_API_KEY="$ACCESS_TOKEN"
    fi
    mkdir -p ~/.bria
    python3 -c "
import json
with open('$HOME/.bria/credentials','w') as f:
    json.dump({'access_token':'$BRIA_API_KEY'},f)
"
    echo "AUTHENTICATED"
    break
  fi
  sleep 5
done

If the output contains AUTHENTICATED, proceed. Otherwise the code expired — start over from Step 2a.

Do not proceed with any API call until authentication is confirmed.

Remove Background

Remove the background from any image, returning a transparent PNG.

The image parameter must be a publicly accessible URL. If the user provided a local file, upload it to a hosting service first or ask for a URL.

RESULT=$(curl -s -X POST "https://engine.prod.bria-api.com/v2/image/edit/remove_background" \
  -H "api_token: $BRIA_API_KEY" \
  -H "Content-Type: application/json" \
  -H "User-Agent: BriaSkills/1.0.0" \
  -d "{\"image\": \"$IMAGE_URL\"}")
echo "$RESULT"

The response contains result_url — a PNG with transparent background. Show this URL to the user.

If the response contains a status_url instead, the job is processing asynchronously. Poll it:

STATUS_URL=$(echo "$RESULT" | python3 -c "import sys,json; print(json.load(sys.stdin).get('status_url',''))" 2>/dev/null)
if [ -n "$STATUS_URL" ]; then
  for i in $(seq 1 30); do
    POLL=$(curl -s "$STATUS_URL" -H "api_token: $BRIA_API_KEY")
    IMAGE_URL_RESULT=$(echo "$POLL" | python3 -c "import sys,json; d=json.load(sys.stdin); print(d.get('result',{}).get('image_url',d.get('result_url','')))" 2>/dev/null)
    if [ -n "$IMAGE_URL_RESULT" ] && [ "$IMAGE_URL_RESULT" != "" ]; then
      echo "DONE: $IMAGE_URL_RESULT"
      break
    fi
    sleep 3
  done
fi

See Also

• generate-image — Generate images from text with FIBO
• replace-bg — Replace background with AI-generated scene
• lifestyle-shot — Place products in lifestyle scenes
• bria-skill — Full Bria AI skill (all tools)