wasm

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Published: Nov 3, 2021 License: AGPL-3.0 Imports: 4 Imported by: 0

README

Using WebAssembly in Storj

In order to use the uplink library from the browser, we can compile the uplink library to WebAssembly (wasm).

Setup

To generate wasm code that can create access grants in the web browser, run the following from the storj/wasm directory:

$ GOOS=js GOARCH=wasm go build -o access.wasm storj.io/storj/satellite/console/wasm

The access.wasm code can then be loaded into the browser in a script tag in an html page. Also needed is a JavaScript support file which ships with golang.

To copy the JavaScript support file, run:

$ cp "$(go env GOROOT)/misc/wasm/wasm_exec.js" .

Ref: Golang WebAssembly docs

The HTML file should include the following:

<script type="text/javascript" src="/path/to/wasm_exec.js"></script>
<script>
    const go = new Go();
    WebAssembly.instantiateStreaming(
        fetch("/path/to/access.wasm"), go.importObject).then(
        (result) => {
            go.run(result.instance);
    });
</script>

Additionally, the HTTP Content-Security-Policy (CSP) script-src directive will need to be modified to allow wasm code to be executed.

See: WebAssembly Content Security Policy docs

Usage
function newPermission
function newPermission()
  • Returns:

    {
        value: {
                AllowDownload: false,
                AllowUpload: false,
                AllowDelete: false,
                AllowList: false,
                NotBefore: "0001-01-01T00:00:00Z",
                NotAfter: "0001-01-01T00:00:00Z",
               },
        error: ""
    }
    
  • Usage:

    newPermission creates a new Permission object with all available permission settings set to default value.

  • Example:

        var permission = newPermission().value;
        permission.AllowedDownload = true;
    
function setAPIKeyPermission
function setAPIKeyPermission(apiKey, buckets, permission)

  • Arguments Accepts three arguments: apiKey, buckets and permission

    • apiKey

      • Type: String
      • Details: This parameter is required
    • buckets

      • Type: Array
      • Details: An array of bucket names that restrict the api key to only contain enough information to allow access to just those buckets. If no bucket names are provided, meaning an empty array, then all buckets are allowed. This parameter is required.
    • permission

  • Returns

    {
        value: "restricted-api-key",
        error: ""
    }
    
    • if an error message is returned, value will be set to an empty string.
  • Usage Creates a new api key with specific permissions.

  • Example

        var apiKey = "super-secret-key";
        var buckets = ["test-bucket"];
        var permission = newPermission().value
        permission.allowUpload = true
        var restrictedAPIKey = setAPIKeyPermission(apiKey, buckets, permission)
    
function generateAccessGrant
function generateAccessGrant(satelliteNodeURL, apiKey, encryptionPassphrase, projectID)

  • Arguments Accepts four arguments: satelliteNodeURL, apiKey, encryptionPassphrase and projectID

    • satelliteNodeURL

    • apiKey

      • Type: String
      • Details: This parameter is required
    • encryptionPassphrase

      • Type: String
      • Details: A string that's used for encryption. This parameter is required.
    • projectID

      • Type: String
      • Details: A project-based salt for determinitic key derivation. Currently it's referring to a project ID. However, it might change in the future to have more randomness. This parameter is required.
  • Returns

    {
        value: "access-grant",
        error: ""
    }
    
    • if an error message is returned, value will be set to an empty string.
  • Usage Creates a new api key with specific permissions.

  • Example

        var satelliteNodeURL = "12tDhBcuMevundiuZPQJd613iW5vCdFtkRDBjBEfjdVtv1hbfCL@127.0.0.1:10000"
        var apiKey = "super-secret-key";
        var passphrase = "123";
        var projectID = "project-id"
        var result = generateAccessGrant(satelliteNodeURL, apiKey, passphrase, projectID);
        if (result.err != "") {
            // something went wrong
        }
        var access = result.value
    

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