2026-05-19 21:45:20 -05:00
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---
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title: 在第一方系统中使用 Gravatar
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2026-05-20 03:39:59 -05:00
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tags:
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- gravatar
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- avatar
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2026-05-19 21:45:20 -05:00
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---
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2026-05-20 01:50:59 -05:00
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[Gravatar](https://gravatar.com)(Globally Recognised Avatar)是一项将头像图片与邮箱地址关联的服务。当用户使用邮箱在你的平台上注册时,你可以直接展示其
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Gravatar 作为默认头像,而无需自行搭建图片上传和存储服务。
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## 工作原理
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Gravatar 提供了一个简单的 HTTP 端点。你只需计算用户**小写并去除首尾空格后**的邮箱地址的 SHA256 哈希值,然后将其嵌入图片
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URL:
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```
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https://gravatar.com/avatar/<hash>
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```
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## 生成哈希
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### Node.js
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```js
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import { createHash } from "node:crypto";
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const email = "user@example.com".trim().toLowerCase();
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const hash = createHash("sha256").update(email).digest("hex");
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const url = `https://gravatar.com/avatar/${hash}`;
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```
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### Python
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```python
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import hashlib
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email = "user@example.com".strip().lower()
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hash = hashlib.sha256(email.encode()).hexdigest()
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url = f"https://gravatar.com/avatar/{hash}"
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```
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### Shell
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```shell
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echo -n "user@example.com" | tr '[:upper:]' '[:lower:]' | sha256sum | cut -d ' ' -f1
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```
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## URL 参数
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`/avatar/` 端点接受以下查询参数来定制结果:
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| 参数 | 描述 | 示例 |
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|-----|------------------------|----------------|
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| `s` | 图片尺寸(像素,默认 80) | `?s=200` |
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| `d` | 未找到 Gravatar 时的默认图片 | `?d=identicon` |
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| `r` | 内容分级(`g`、`pg`、`r`、`x`) | `?r=g` |
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### 默认图片选项(`d`)
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- `identicon` — 基于哈希值的几何图案
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- `robohash` — 自动生成的机器人图片
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- `retro` — 8-bit 风格的像素化人脸
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- `monsterid` — 自动生成的怪物卡通
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- `wavatar` — 自动生成的人脸
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- `mp` — 通用剪影(Mystery Person)
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- `blank` — 透明 PNG
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- 自定义 URL(需经过 URL 编码)
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### 完整示例
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```html
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<img
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src="https://gravatar.com/avatar/a3b4c5d6e7f8?s=160&d=robohash&r=g"
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alt="用户头像"
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width="160"
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height="160"
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/>
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```
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始终传入 `d` 参数以避免未设置 Gravatar 的用户出现裂图。`identicon` 和 `robohash` 是常用的选择,因为它们能为每个哈希值生成唯一且易于辨识的图片。
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