did-resolver-java-client

Get it

Maven

Add the JitPack repository to build file

<repositories>
    <repository>
        <id>jitpack.io</id>
        <url>https://jitpack.io</url>
    </repository>
</repositories>

Add dependency

<dependency>
    <groupId>com.github.METADIUM</groupId>
    <artifactId>did-resolver-java-client</artifactId>
    <version>0.1.4</version>
</dependency>

Gradle

Add root build.gradle

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

Add dependency

dependencies {
    implementation 'com.github.METADIUM:did-resolver-java-client:0.1.4'
}

Use it

Logging

Logging use slf4j.

<!-- logback.xml -->
<logger name="com.metadium.did.resolver.client" level="DEBUG" additivity ="false">
	<appender-ref ref="console" />
</logger>

Get DID Document

Didocument didDocument = DIDResolverAPI.getInstance().getDocument("did:meta:testnet:000000000000000000000000000000000000000000000000000000000000054b");

Get public key in document

Didocument didDocument = DIDResolverAPI.getInstance().getDocument("did:meta:testnet:000000000000000000000000000000000000000000000000000000000000054b");

// retrieve public key
for (PublicKey publicKey : didDocument.getPublicKey()) {
	// getPublicKeyHex() or getPublicKeyHash()
}

// Get public key with key id
String keyId = "did:meta:testnet:000000000000000000000000000000000000000000000000000000000000054b#MetaManagementKey#cfd31afff25b2260ea15ef59f2d5d7dfe8c13511"
document.getPublicKey(keyId);

// Get decoded public key
ECPublicKey publicKey = (ECPublicKey)document.getPublicKey(keyId).getPublicKey();

// Check public key from signature
byte[] message = (to sign message);
String signature = (hex string of V+R+S to sign secp256k1);
boolean bContainsPublicKey = document.hasRecoverAddressFromSignature(message, signature);