This Cairo component allows you to efficiently create a dynamic token_uri. The concept is simple, you
just have to call set_base_uri(your_uri) where your_uri is an array of utf-8 felt encoded strings.
A felt can contain 31 ascii chars, so if your uri is something like "https://my.example.api/get_token_uri?uri=",
you should pass [ 'https://my.example.api/get_toke', 'n_uri?uri=' ].
You can then get a URL with a dynamically appended number at the end with get_uri(number), for example
with get_uri(12345), you should get [ 'https://my.example.api/get_toke', 'n_uri?uri=12345' ] in a
minimal amount of steps.
Install the component through scarb by specifying it in your dependencies. I recommend to specify a commit with rev.
[dependencies]
custom_uri = { git = "https://github.com/starknet-id/custom_uri_component", rev = "abb2f3d43c7be56dd5cd9f93c33af40b272c2245" }Add it to your cairo code:
use custom_uri::{interface::IInternalCustomURI, main::custom_uri_component};
// load component
component!(path: custom_uri_component, storage: custom_uri, event: CustomUriEvent);
#[storage]
struct Storage {
#[substorage(v0)]
custom_uri: custom_uri_component::Storage
}
#[event]
#[derive(Drop, starknet::Event)]
enum Event {
CustomUriEvent: custom_uri_component::Event
}You can now set your URI in your constructor (for example):
self.custom_uri.set_base_uri(token_uri_base);To add the standard ERC721 token_uri function while using OZ ERC721 component, I suggest to define a new impl (and implement it with #[abi(embed_v0)]) like:
use openzeppelin::{
token::erc721::{ERC721Component::{ERC721Metadata, HasComponent}},
introspection::src5::SRC5Component,
};
use custom_uri::{main::custom_uri_component::InternalImpl, main::custom_uri_component};
#[starknet::interface]
trait IERC721Metadata<TState> {
fn name(self: @TState) -> felt252;
fn symbol(self: @TState) -> felt252;
fn token_uri(self: @TState, tokenId: u256) -> Array<felt252>;
fn tokenURI(self: @TState, tokenId: u256) -> Array<felt252>;
}
#[starknet::embeddable]
impl IERC721MetadataImpl<
TContractState,
+HasComponent<TContractState>,
+SRC5Component::HasComponent<TContractState>,
+custom_uri_component::HasComponent<TContractState>,
+Drop<TContractState>
> of IERC721Metadata<TContractState> {
fn name(self: @TContractState) -> felt252 {
let component = HasComponent::get_component(self);
ERC721Metadata::name(component)
}
fn symbol(self: @TContractState) -> felt252 {
let component = HasComponent::get_component(self);
ERC721Metadata::symbol(component)
}
fn token_uri(self: @TContractState, tokenId: u256) -> Array<felt252> {
let component = custom_uri_component::HasComponent::get_component(self);
component.get_uri(tokenId)
}
fn tokenURI(self: @TContractState, tokenId: u256) -> Array<felt252> {
self.token_uri(tokenId)
}
}
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