{
  "$id": "https://schemas.mapi.dev/v1/postpolicy.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "additionalProperties": false,
  "description": "A V4 POST policy: multipart form uploads of any key under ``prefix``.\n\nThe uploader posts ``multipart/form-data`` to ``url`` with every entry of ``fields``,\nthen ``key`` (which must start with ``prefix``), then the ``file`` part last. The storage\nservice rejects bodies outside ``content_length_range`` and keys outside the prefix.\n\nA ``create_only`` policy cannot replace an existing object (its signed conditions carry\n``x-goog-if-generation-match: 0``), so the holder can neither overwrite the write-once\nmanifest nor swap an output after it was written.",
  "examples": [
    {
      "content_length_range": [
        0,
        1073741824
      ],
      "expires_at": "2026-10-15T10:30:00Z",
      "fields": {
        "policy": "eyJjb25kaXRpb25zIjpbXX0=",
        "x-goog-algorithm": "GOOG4-HMAC-SHA256",
        "x-goog-credential": "local/20261015/auto/storage/goog4_request",
        "x-goog-date": "20261015T093000Z",
        "x-goog-signature": "abcdef0123"
      },
      "method": "POST",
      "prefix": "t/default/runs/run_01jabc/a1/",
      "url": "http://127.0.0.1:4443/mapi-local-runs"
    }
  ],
  "properties": {
    "content_length_range": {
      "maxItems": 2,
      "minItems": 2,
      "prefixItems": [
        {
          "type": "integer"
        },
        {
          "type": "integer"
        }
      ],
      "title": "Content Length Range",
      "type": "array"
    },
    "create_only": {
      "default": false,
      "title": "Create Only",
      "type": "boolean"
    },
    "expires_at": {
      "format": "date-time",
      "title": "Expires At",
      "type": "string"
    },
    "fields": {
      "additionalProperties": {
        "type": "string"
      },
      "maxProperties": 32,
      "title": "Fields",
      "type": "object"
    },
    "method": {
      "const": "POST",
      "default": "POST",
      "title": "Method",
      "type": "string"
    },
    "prefix": {
      "maxLength": 1024,
      "minLength": 1,
      "title": "Prefix",
      "type": "string"
    },
    "url": {
      "maxLength": 8192,
      "minLength": 8,
      "title": "Url",
      "type": "string"
    }
  },
  "required": [
    "url",
    "prefix",
    "content_length_range",
    "expires_at"
  ],
  "title": "PostPolicy",
  "type": "object",
  "x-mapi-contract-version": "0.2"
}