@ -59,7 +59,7 @@ If you don’t find `npm` in your system, [install it](https://www.npmjs.com/get
Finally, make sure you have [created at least one Blockstack ID]({{site.baseurl}}/browser/ids-introduction.html#create-an-initial-blockstack-id).
You’ll use this ID to interact with the application.
## Install the application code and retrieve the dependencies
## Task 1: Install the code and retrieve the dependencies
You can clone the source code with `git` or [download and unzip the code from
the
@ -96,7 +96,7 @@ The Todo application has a basic Vue.js structure. There are several configurati
| `components/Dashboard.vue` | Application data storage and user sign out. |
## Sign into the application
## Task 2: Sign into the application
The example application runs in a node server on your local host. In the this section, you start the application and interact with it.
@ -109,17 +109,31 @@ The example application runs in a node server on your local host. In the this se
This path will be different for you, but double-check the last part to ensure that you're in the directory into which you cloned and in which you ran `npm install`.
2. Start the application.
2. Start the application in your local environment.
```bash
$ npm run serve
```
$ npm run start
You should see output similar to the following:
```bash
98% after emitting CopyPlugin s
DONE Compiled successfully in 5854ms 7:34:28 PM
App running at:
- Local: http://localhost:8080/
- Network: http://192.168.0.12:8080/
Note that the development build is not optimized.
To create a production build, run npm run build.
```
2. Open your local browser to the `http://localhost:8080` URL.
You should see a simple application:
2. Choose **Sign In with Blockstack**.
3. Choose **Sign In with Blockstack**.
If you have already signed into Blockstack the application prompts you to select the ID to use. If you aren’t signed in, Blockstack prompts you to:
@ -129,13 +143,19 @@ The example application runs in a node server on your local host. In the this se
## Understand the sign in process
## Task 3: Larn about the sign in process
{% include sign_in.md %}
## Task 4: Decode the authRequest
To decode the token and see what information it holds:
The `iss` property is a decentralized identifier or `did`. This identifies the user and the user name to the application. The specific `did` is a `btc-addr`.
## Under the covers in the sign in code
## Task 5: Under the covers in the sign in code
Now, go to the underlying `blockstack-todo` code you cloned or downloaded. Sign
in and sign out is handled in each of these files:
@ -175,26 +196,32 @@ in and sign out is handled in each of these files:
| `Landing.vue ` | Generates the `authRequest`. |
| `Dashboard.vue` | Handles sign out. |
The `src/components/Landing.vue` code calls a [`redirectToSignIn()`](https://blockstack.github.io/blockstack.js#redirectToSignIn) function which generates the `authRequest` and redirects the user to the Blockstack authenticator:
The `src/components/Landing.vue` code configures an `AppConfig` object and then uses this to create a `UserSession`. Then, the application calls a [`redirectToSignIn()`](https://blockstack.github.io/blockstack.js#redirectToSignIn) function which generates the `authRequest` and redirects the user to the Blockstack authenticator:
```js
signIn () {
const blockstack = this.blockstack
blockstack.UserSession.redirectToSignIn()
const appConfig = new this.blockstack.AppConfig(['store_write', 'publish_data'])
const UserSession = new this.blockstack.UserSession({ appConfig: appConfig })
UserSession.redirectToSignIn()
}
```
Once the user authenticates, the application handles the `authResponse` in the `src/App.vue` file. :
} else if (blockstack.UserSession.isSignInPending()) {
blockstack.UserSession.handlePendingSignIn()
mounted () {
const UserSession = this.UserSession
if (UserSession.isUserSignedIn()) {
this.userData = UserSession.loadUserData()
this.user = new this.blockstack.Person(this.userData.profile)
this.user.username = this.userData.username
} else if (UserSession.isSignInPending()) {
UserSession.handlePendingSignIn()
.then((userData) => {
window.location = window.location.origin
})
}
},
```
If [`blockstack.isUserSignedIn()`](https://blockstack.github.io/blockstack.js/#isusersignedin) is true, the user was previously signed in so Blockstack pulls the data from the browser and uses it in our application. If the check on [`blockstack.UserSession.isSignInPending()`](https://blockstack.github.io/blockstack.js/#issigninpending) is true, a previous `authResponse` was sent to the application but hasn't been processed yet. The `handlePendingSignIn()` function processes any pending sign in.
@ -203,27 +230,26 @@ Signout is handled in `src/components/Dashboard.vue`.
The method allows the application creator to decide where to redirect the user upon Sign Out:
## Working with the application
## Task 6: Work with the application
Now, trying adding a few itmes to the todo list. For example, try making a list of applications you want to see built on top of Blockstack:
Now, trying adding a few items to the todo list. For example, try making a list of applications you want to see built on top of Blockstack:
Each list is immediately stored in the Gaia Hub linked to your Blockstack ID.
For more information about the Gaia hub, see the [hub
repository](https://github.com/blockstack/gaia). You can fetch the `todos.json`
For more information about the Gaia hub, [see the overview in this documentation]({{ site.baseurl }}/storage/overview.html#). You can fetch the `todos.json`
file you just added by opening the Javascript console and running the following
@ -297,8 +325,8 @@ The code needs to read the Todo items from the storage with the [`blockstack.Use
```js
fetchData () {
const blockstack = this.blockstack
blockstack.UserSession.getFile(STORAGE_FILE) // decryption is enabled by default
const UserSession = this.UserSession
UserSession.getFile(STORAGE_FILE) // decryption is enabled by default
.then((todosText) => {
var todos = JSON.parse(todosText || '[]')
todos.forEach(function (todo, index) {
@ -314,6 +342,7 @@ The `todos` data is retrieved from the promise.
## Summary
{:.no_toc}
You now have everything you need to construct complex applications complete with authentication and storage on the Decentralized Internet. Why not try coding [a sample application that accesses multiple profiles](blockstack_storage.html).
Mary Anthony
6 years ago
