NEAR NEAR Certified Developer Demos, 15 Jul 2021

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From YouTube: NEAR Certified Demo | Episode 2.2 -- Redirector Extension

Description

This demonstration was presented by the author(s) after just 1 week of working with the NEAR platform as part of the NEAR Certified Developer program.

You can find the source code to this demo here:
https://github.com/Learn-NEAR/NCD-02--redirector-extension

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A

um So alex alexander and dimitri, um alex and dimitri, if you could, please share your screen present your demo I'll start. The timer uh you've got five to ten minutes.

B

Hi everyone, hello um jima: where are you.

B

I I'm waiting dmitry palchum, sorry.

C

I I thought it's not good to have too much videos hi, uh because the connection- probably not so great for too many videos, connection yeah.

A

Okay, so who will present, who will share their screen and present.

C

Alex starts and I will continue suppose.

B

Okay, uh jimmy, can you explain the idea of the project.

C

Okay, okay, okay, um okay, the idea is there are.

C

um There are many issues last time because of uh resources on personal web pages, got blocked on twitter or on youtube, and so on so, and we thought it should be possible to create some kind of redirect servers so like http, 301 but running on on client, not on server so and it should be.

C

uh It should be some kind of community service where the people could store redirects, which website if a website is blocked. You can just point out that the other website, other the user, should be redirected to another website and it should be decentralized service. So just an idea.

C

Some to play with this project is essentially just a play box, sandbox of our bigger project, the doublets which rigid idea of augmented web, where we can add augmentations or buttons or badges, or something like that on the top of any web page and this project, the bigger project, is decentralized as well, and it has decentralized storage and decentralized registry and so on, and we started to make it on ethereum, but it's essentially prohibitive too expensive to store registers registry on ethereum.

C

Now so we are thinking about to move to near, and this is their background of our idea. Why we are here and once back, the community director is just a playground to to connect near wallet into the bigger doublet project.

A

That's great welcome. Thank you for that introduction.

B

uh I'm starting a demo a sharing screen.

B

Do you see something.

A

Yep, I can see your code.

B

Great, uh for example, imagine that my twitter page is blocked banned and I want to create a redirection to another web page, for example, to my near world.

B

First of all, I need to run an extension.

B

Open the pop-up and sign in to the near wallet.

B

It was a little difficult challenge to connect near wallet to the extension, because your near api, js library, doesn't support it.

B

I have to write to some overrides to enable such feature.

B

Yes, we signed him.

B

Okay, to create a resurrection, we can type redirect keyword.

B

And paste the url of target web page, where we want to be redirected, for example with my near wallet in test net.

B

After that we can see the suggestion about ready recreation here, create redirect from twitter also hive and to wallet test near work.

B

You can type some message to your user, which.

B

Which which will be redirected, for example, I'm bound.

B

At the twitter.

B

You can find me here.

B

The resurrection is a added to smart.

D

Contract, yes,.

B

We can see the transaction in explorer.

B

Here is the hash key check 2256 of twitter url? Oh no,.

B

Here's the message was, which was typed: here's a target url after that we can refresh our web page and the pop-up will be shown with suggestion to redirect here is my message.

B

We can redirect now- and this is a target.

B

B

So it's it's how it is work.

A

That's great, thank you. So much can we see the code behind it. Can you tell us a little bit about how you built it.

B

Oh dmitry, can you demonstrate the code.

C

uh Yes, I can show the code and test just a moment so share the screen. Now I can enter the screen while another sharing.

C

Share screen so screen.

C

um Am I sharing.

A

C

Yeah I have, unfortunately, one uncommitted commit unpatched commit because of some merge complete. It doesn't matter I'll, show you the state of the art currently, so essentially, it's a very easy. Currently, we have a contract that had a new redirection which is uh contains of uh key other. This is the hash value uh we we took cash because otherwise we uh just to pre preserve her privacy.

C

Somehow um target is a targeted oral and message in the message essentially, um and uh we it is like guest book essentially, and we just try to get if there any redirection array, because they could do more than one redirects. If there is one, then.

C

We create a redirection for and uh just uh patch the key um or the set it so just and then we can get the direct array of redirects and we can clear the all redirects and the model is essentially very simple and it's one persistent map and consistent, vector, persistent vector of all keys, because uh the map, uh I suppose, like an ethereum, is not a durable. I can't iterate over the map. uh If I want to clean it, so I have to store all the keys separately.

C

I suppose it was this thing.

A

I just want to note that I I see that you're using the same prefix on lines, eight and nine for these two different uh wrappers. um I just wanted to note that I see that you're using the same prefix m m double m for the eight and nine.

C

uh Okay, okay, is it, is it a bargain? I thought it's some kind of name space for the project.

A

It's a name space for the the keys in storage related to this abstraction, so that you can uh read and write um from storage for the persistent map, serializing and deserializing. According to the the members of the of that.

C

Collection, they have to be different.

A

They must be different, yeah.

C

They must be different okay. This is this was exactly the topic we have discussed earlier with alexander.

C

If I uh array, if I um redeploy the contract and the content has changed uh and the state is preserved, so I thought I have to change the namespace in order to to use another slots in the storage, uh otherwise it uh for as my understanding of ethereum, it will be corrupted. If I.

A

So you could you could do that and and and make a case for versioning your data.

A

If you wanted to you, know v1 v2, something like that for for these, but but in the end, all that's happening underneath the hood, if you you know, control click on these um abstractions persistent map and persistent vector and look at the source code behind them, you'll see they're just reading and writing to storage, which is key value pair, and this prefix is name spacing the key name for you. So there are some keys which are starting with mm. These will be the persistent map keys and then the m single m.

A

These would be for the persistent vector these keys, but everything.

D

Is in this key.

A

Value. Storage! Yes, so definitely.

D

A

Two should be different for the contract. Yeah.

C

Okay, I understood so.

A

C

Tests are very basic, essentially and.

C

I just clear all the storage between tests. Okay, this is empty test, should work any in any situation and then I just add a message.

C

Called the function add and expect that it should be only one reduction key, and I expect that uh for this key it should be. It should be an array, and if this array should contain only one redirect it's there's no more tests. Currently, okay,.

A

No problem, that's great yeah we're a little bit over 10 minutes, but there was some. You know overhead and switching. I took a little bit of your time explaining this piece about the keys. So maybe can we just wrap up at this point.

C

A

Sorry, I didn't mean to totally cut you off, but is there anything else that you want to say to kind of.

C

Wrap the project or end the project; no, no! No! It's! uh We have demonstrated everything I suppose yeah okay,.

A

Wonderful. Thank you any questions. Any questions from the any comments, questions or comments from the group.

C

All the tests should run. I.

D

Suppose I have, I have one one comment and correct me if, if I'm wrong, uh like, I like this idea with uh community-driven redirects database on blockchain uh and the the my question is like like I've got, that feeling like like this is pretty like major uh thing with uh block twitter accounts and stuff like that right and it does it look to you guys as well like, as as I can see that, like like a pretty simple contract like written like an assembly, script can be a good use for this, like huge problem like like to me, looks like like this is the like: the simplest contract, probably right ever right, and but but it does its work.

D

C

uh Sorry I have to destroy the question: is the simplest uh contract, but what what.

D

But but but but it does the jobs like it's uh like with a simple contract. You can.

C

Be a big issue.

C

Essentially, it's a very basic implementation, so we need to verify if somebody has created a valid redirect for his own uh for his own earth, page and so on. It's just a sandbox if we think about the main application about that place. Essentially that's what.

D

A

C

Really building so there are some.

C

Attachments: okay,.

C

Switch something.

C

On uh then, we need to make much more work on contract in order to be sure that uh there's no spam redirect spam. No uh for sure, um but for this case we would like to test. How can we create uh or integrate a neo wallet into into our plugin, and we would like to see um uh if it everything work to to get the data on to store the data from the extension, because this is our main topic. We essentially we have here wallets here.

C

We could theoretically connect that we can connect to metamask and wallet, and we would like to see here near uh to connect to, and this is what we have worked on. Essentially in uh this uh time we have checked how we can connect near uh to extension,.

D

Yeah yeah, okay, okay, so my actually idea was like yeah. I don't know much about the doubtless thing and stuff right, but I can see a pure, very simple, easy to understand. Use case like for this particular demons that you just showed like, like everyone can get it at. Everyone knows like man like this is huge like I don't like it like, like mr trump would like it too right like I was blocked several times on twitter like for no reason right like, and this is a pain in the ass right.

D

So uh if you have, uh if you have any uh any capabilities- and we will be gladly to help you to get this particular project to put it on like on main net on your like, as as you know, the pilot thing yeah.

C

Yeah uh yeah, it would be great to finalize it. um There are two challenges there, the first challenge. We need to make sure that a particular resource is really owned by somebody who claims it. So um in case of twitter, we uh we can post. uh We can ask uh somebody to post a tweet and pass it and be sure that it's really owned and connect essentially establish connection between.

A

C

And near account and twitter account, so we need some kind of oracles there for this and then, if something changes, if account get hijacked or someone uh or something like that, we need some kind of oracle to determine it. uh Some kind of clairos community or something like that. So um it's not so easy, but it's doable.

A

Yeah cool. Thank you. That's great yeah, thanks! So much for the demo, um any other questions, any other comments.