DiceBear as Gravatar default avatar

You can use the HTTP API of DiceBear as Gravatar default image. But before that, let's take a look at the conditions for Gravatar default images:

1. ✅ MUST be publicly available (e.g. cannot be on an intranet, on a local development machine, behind HTTP Auth or some other firewall etc). Default images are passed through a security scan to avoid malicious content.
2. ✅ MUST be accessible via HTTP or HTTPS on the standard ports, 80 and 443, respectively.
3. ⚠️ MUST have a recognizable image extension (jpg, jpeg, gif, png, heic)
4. ⚠️ MUST NOT include a querystring (if it does, it will be ignored)

Source: https://docs.gravatar.com/sdk/images/#default-image

Since Gravatar does not support SVG, we have to use the PNG endpoint.

JavaScript

const emailHash = encodeURIComponent('00000000000000000000000000000000');
const defaultImage = encodeURIComponent(
  'https://api.dicebear.com/10.x/lorelei/svg'
  'https://api.dicebear.com/10.x/lorelei/png'
);

const gravatarImage = `https://www.gravatar.com/avatar/${emailHash}?d=${defaultImage}`;
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng

PHP

$emailHash = urlencode('00000000000000000000000000000000');
$defaultImage = urlencode(
  'https://api.dicebear.com/10.x/lorelei/svg'
  'https://api.dicebear.com/10.x/lorelei/png'
);

$gravatarImage = sprintf(
  'https://www.gravatar.com/avatar/%s?d=%s',
  $emailHash,
  $defaultImage
);
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng

Python

import urllib.parse

email_hash = urllib.parse.quote("00000000000000000000000000000000")
default_image = urllib.parse.quote(
    "https://api.dicebear.com/10.x/lorelei/svg"
    "https://api.dicebear.com/10.x/lorelei/png"
)

gravatar_image = f"https://www.gravatar.com/avatar/{email_hash}?d={default_image}"
# https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng

Go

import (
	"fmt"
	"net/url"
)

emailHash := url.QueryEscape("00000000000000000000000000000000")
defaultImage := url.QueryEscape(
	"https://api.dicebear.com/10.x/lorelei/svg", 
	"https://api.dicebear.com/10.x/lorelei/png", 
)

gravatarImage := fmt.Sprintf("https://www.gravatar.com/avatar/%s?d=%s", emailHash, defaultImage)
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng

Usually we set options in the query string, such as the seed. Since a query string is not allowed by Gravatar, the HTTP-API allows you to specify the options in the path. Just replace the question mark with a slash and encode the options.

JavaScript

const emailHash = encodeURIComponent('00000000000000000000000000000000');
const options = `seed=${emailHash}`;
const defaultImage = encodeURIComponent(
  `https://api.dicebear.com/10.x/lorelei/png?${options}`
  `https://api.dicebear.com/10.x/lorelei/png/${encodeURIComponent(options)}`, 
);

const gravatarImage = `https://www.gravatar.com/avatar/${emailHash}?d=${defaultImage}`;
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng%2Fseed%253D00000000000000000000000000000000

PHP

$emailHash = urlencode('00000000000000000000000000000000');
$options = sprintf('seed=%s', $emailHash);
$defaultImage = urlencode(
  'https://api.dicebear.com/10.x/lorelei/png?' . $options 
  'https://api.dicebear.com/10.x/lorelei/png/' . urlencode($options) 
);

$gravatarImage = sprintf(
  'https://www.gravatar.com/avatar/%s?d=%s',
  $emailHash,
  $defaultImage
);
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng%2Fseed%253D00000000000000000000000000000000

Python

import urllib.parse

email_hash = urllib.parse.quote("00000000000000000000000000000000")
options = f"seed={email_hash}"
default_image = urllib.parse.quote(
    f"https://api.dicebear.com/10.x/lorelei/png?{options}"
    f"https://api.dicebear.com/10.x/lorelei/png/{urllib.parse.quote(options)}"
)

gravatar_image = f"https://www.gravatar.com/avatar/{email_hash}?d={default_image}"
# https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng%2Fseed%253D00000000000000000000000000000000

Go

import (
	"fmt"
	"net/url"
)

emailHash := url.QueryEscape("00000000000000000000000000000000")
options := fmt.Sprintf("seed=%s", emailHash)
defaultImage := url.QueryEscape(
	fmt.Sprintf("https://api.dicebear.com/10.x/lorelei/png?%s", options), 
	fmt.Sprintf("https://api.dicebear.com/10.x/lorelei/png/%s", url.QueryEscape(options)), 
)

gravatarImage := fmt.Sprintf("https://www.gravatar.com/avatar/%s?d=%s", emailHash, defaultImage)
// https://www.gravatar.com/avatar/00000000000000000000000000000000?d=https%3A%2F%2Fapi.dicebear.com%2F10.x%2Florelei%2Fpng%2Fseed%253D00000000000000000000000000000000