# 生成素材上传签名

标准 URL： https://sosoapi.ai/zh-hans/docs/api/assets-api-upload-sign

契约：sha256:563d2d581da0ad29

获取工作区媒体对象的签署上传 URL。将文件位元组上传至该 URL，再调用 upload/complete 登记素材。此端点不会替你读取本地文件。

POST /assets-api/upload/sign

## 验证与权限

- **接受的凭证类别：** user_session、delegated_oauth、personal_access_token

- **委派能力：** agent:operate

- **最低工作区角色：** editor

- **访问范围：** 此用户获准访问的资源

- **需要所有工作区同意：** 否

- **更改状态：** 是

- **操作完成时：** synchronous_http_response

令牌只能使用其所有者持有的权利。每次请求会检查工作区成员资格、资源拥有权、所选工作区及已授予能力。core 与 full 配置只变更显示的工具，不会授予访问权限。

## 请求字段

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "workspace_id": {
      "type": "string",
      "format": "uuid",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
    },
    "asset_type": {
      "type": "string",
      "enum": [
        "image",
        "video"
      ]
    },
    "filename": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "content_type": {
      "type": "string",
      "minLength": 1,
      "maxLength": 120
    },
    "byte_size": {
      "type": "integer",
      "minimum": 1,
      "maximum": 524288000,
      "description": "Exact length in bytes of the body you will PUT (max 500 MiB). It is signed into the upload URL as Content-Length, counted against the workspace storage limit, and checked again when you complete the upload: an object longer than declared is rejected and removed."
    },
    "content_sha256": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$"
    },
    "title": {
      "type": "string",
      "maxLength": 200
    }
  },
  "required": [
    "workspace_id",
    "asset_type",
    "filename",
    "content_type",
    "byte_size",
    "content_sha256"
  ],
  "additionalProperties": false
}
```

## 响应与完成

成功 HTTP 状态：200

成功 HTTP 响应可能表示请求已接受，并非已完成。背景工作请存储返回 ID，持续检查同一操作直到完成。已排程或已接受的帖子，只有平台确认后才算已发布；客户端逾时无法证明结果。

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "object_key": {
      "type": "string",
      "minLength": 1
    },
    "public_url": {
      "type": "string",
      "format": "uri"
    },
    "signed_url": {
      "type": "string",
      "format": "uri"
    },
    "upload_headers": {
      "type": "object",
      "properties": {
        "Content-Type": {
          "type": "string",
          "minLength": 1
        },
        "x-amz-checksum-sha256": {
          "type": "string",
          "minLength": 1
        }
      },
      "required": [
        "Content-Type",
        "x-amz-checksum-sha256"
      ]
    },
    "expires_seconds": {
      "type": "integer",
      "exclusiveMinimum": 0,
      "maximum": 9007199254740991
    }
  },
  "required": [
    "object_key",
    "public_url",
    "signed_url",
    "upload_headers",
    "expires_seconds"
  ]
}
```

## 错误与安全重试

检查 HTTP 状态和响应正文。400 验证错误可能包含 ZodError；处理程序错误使用 error、message 和 code 字段。保留 request_id 或 x-request-id 以便诊断，但不要保留凭证。先解决 401/403 访问错误再重试，并在收到 429 时遵循 Retry-After。如写入结果不确定或返回 5xx，先读取现有结果。仅在支持时复用幂等键；重试行为因操作而异，并不保证恰好交付一次。

## 示例

这些示例使用已依schema检查的虚构值。请将 ID 替换为你有权使用的 ID、将媒体替换为已就绪素材，并将日期替换为已确认的发布时间。提交写入前，请检查账号资格。本页不会发送 API 请求。

在服务器上将 SOSOAPI_ACCESS_TOKEN 设为此操作接受的凭证，且不要放入浏览器代码。agent 请使用 sosoapi auth login 通过浏览器登录，并由 CLI 更新凭证。

request.json

```json
{
  "workspace_id": "11111111-1111-4111-8111-111111111111",
  "asset_type": "image",
  "filename": "example.png",
  "content_type": "image/png",
  "byte_size": 1,
  "content_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
}
```

cURL

```bash
curl --request POST \
  "https://gqeshlawtcexsapabaui.supabase.co/functions/v1/assets-api/upload/sign" \
  -H "Authorization: Bearer $SOSOAPI_ACCESS_TOKEN" \
  -H "Content-Type: application/json" \
  --data-binary @request.json
```

JavaScript

```js
// Server-side JavaScript. Do not print tokens or credential-bearing responses.
const token = process.env.SOSOAPI_ACCESS_TOKEN;
if (!token) throw new Error("Set an accepted credential for this operation");
const response = await fetch("https://gqeshlawtcexsapabaui.supabase.co/functions/v1/assets-api/upload/sign", {
  method: "POST",
  headers: { "Content-Type": "application/json", Authorization: "Bearer " + token },
  body: JSON.stringify({
  "workspace_id": "11111111-1111-4111-8111-111111111111",
  "asset_type": "image",
  "filename": "example.png",
  "content_type": "image/png",
  "byte_size": 1,
  "content_sha256": "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
})
});
const result = await response.json();
// Check response.ok, the operation-specific body and completion state before continuing.
```

CLI

```bash
npx sosoapi api post /assets-api/upload/sign < request.json
```

合成响应示例

```json
{
  "object_key": "example",
  "public_url": "https://example.com/media.png",
  "signed_url": "https://example.com/media.png",
  "upload_headers": {
    "Content-Type": "example",
    "x-amz-checksum-sha256": "example"
  },
  "expires_seconds": 1
}
```

## 相关工具与指南

MCP：sosoapi_upload_asset

[API 参考](https://sosoapi.ai/zh-hans/docs/api)