Security Rules

// These two rules are at the SAME LEVEL (both are direct children of the parent)
module.exports = {
  "pets": {
    "read": "true",  // Rule 1: Anyone can read pets
    "write": "admin.claims.role == 'petOwner'",  // Rule 2: Must be pet owner
    "validate": "newData.type == 'cat' || newData.type == 'dog'"  // Only cats/dogs
  },
  "$other": {  // ← This is at the SAME LEVEL as "pets" above
    "read": "admin.claims.role == 'admin'",  // Rule 3: Must be admin
    "write": "false",  // Rule 4: No writes allowed
    "validate": "newData != null"  // Not empty
  }
}

// When accessing "pets":
// Read: BOTH "true" AND "admin.claims.role == 'admin'" must pass → Fails for non-admins!
// Write: BOTH "admin.claims.role == 'petOwner'" AND "false" must pass → Always fails!
// Validate: ONLY the "pets" rule applies (most specific)

module.exports = {
  "users": {
    "$userId": {
      // Don't grant a blanket read at $userId — that grant cascades down
      // and would override the deeper email rule. Grant read on the
      // public-facing fields instead.
      "write": "admin.uid == $userId",   // Only the user can edit their profile
      "name":  { "read": "true" },       // Public
      "bio":   { "read": "true" },       // Public
      "email": { "read": "admin.uid == $userId" }  // Private — only the user
    }
  }
};

module.exports = {
  "store": {
    "write": "admin.claims.role == 'admin'",
    "products": {
      "write": "admin.claims.role == 'manager'",
      "$productId": {
        "write":    "admin.uid == data.ownerId",
        "validate": "newData.name && newData.price > 0"
      }
    }
  }
};

// Simple read rule
// Don't put "read": "true" at the $postId level — it would cascade and
// override the draft restriction. Grant read on the published fields only.
"posts": {
  "$postId": {
    "title": { "read": "true" },
    "body":  { "read": "true" },
    "draft": { "read": "admin.uid == data.authorId" }  // Only author can read drafts
  }
}

// Using variables in paths
"users": {
  "$userId": {
    "name":  { "read": "true" },                       // Public
    "email": { "read": "admin.uid == $userId" }        // Only the user can read their own email
  }
}

// Basic write rule
"posts": {
  "$postId": {
    "write": "admin.uid == data.authorId",  // Only author can edit
    "createdAt": {
      "write": "!data"  // Can only set createdAt when creating (no previous data)
    }
  }
}

// How write rules cascade along the target path
// (any rule along the path that returns true is sufficient)
"store": {
  "write": "false",  // Blocks writes that TARGET ["store"] directly
  "products": {
    "write": "admin.claims.role == 'manager'",  // Applies when writing AT ["store","products"] or deeper
    "$productId": {
      "write": "admin.uid == data.ownerId"      // Applies when writing AT ["store","products",]
    }
  }
}

// What actually happens:
// set(["store"], ...)                      → only store.write applies        → DENIED
// set(["store","products"], ...)           → store.write OR store.products.write
//                                            → ALLOWED if user is a manager
// set(["store","products","abc"], ...)     → store.write OR store.products.write
//                                            OR store.products.$productId.write
//                                            → ALLOWED if manager OR uid == data.ownerId

// Simple field validation
"users": {
  "$userId": {
    "age": {
      "validate": "newData >= 13 && newData <= 120"
    },
    "email": {
      "validate": "newData.includes('@') && newData.includes('.')"
    }
  }
}

// Validating objects with required fields
"posts": {
  "$postId": {
    "validate": "newData.title && newData.content && newData.title.length <= 200"
  }
}

// Using data and newData to compare old and new values
"users": {
  "$userId": {
    "credits": {
      // Ensure credits can only increase, not decrease
      "validate": "newData >= data"
    }
  }
}

// Complex validation with multiple conditions
"products": {
  "$productId": {
    "validate": "newData.name && newData.price > 0 && newData.stock >= 0"
  }
}

// Example: update(["users", "john", "tags"], ["red", "blue", "green"])
// This generates paths:
// 1. ["users", "john", "tags"]     ← Entire array
// 2. ["users", "john", "tags", "0"] ← Element 0: "red"
// 3. ["users", "john", "tags", "1"] ← Element 1: "blue"
// 4. ["users", "john", "tags", "2"] ← Element 2: "green"

// METHOD 1: Validate the ENTIRE array
"users": {
  "$userId": {
    "tags": {
      // newData = entire array ["red", "blue", "green"]
      "validate": "Array.isArray(newData) && newData.length <= 5"
    }
  }
}

// METHOD 2: Validate EACH element using wildcard
"users": {
  "$userId": {
    "tags": {
      "$index": {  // $index matches "0", "1", "2", etc.
        // newData = individual element ("red", "blue", or "green")
        "validate": "typeof newData === 'string' && newData.length < 20"
      }
    }
  }
}

// METHOD 3: COMBINE both approaches
"users": {
  "$userId": {
    "tags": {
      // Validate array properties
      "validate": "Array.isArray(newData) && newData.length <= 5",
      "$index": {
        // Validate each element
        "validate": "typeof newData === 'string' && newData.length < 20"
      }
    }
  }
}

// Complex array validation with element uniqueness check
"users": {
  "$userId": {
    "favoriteColors": {
      "$index": {
        // Each color must be a valid hex code
        "validate": "typeof newData === 'string' && /^#[0-9A-F]{6}$/i.test(newData)"
      }
    }
  }
}