com.ksyun.ks3.service.encryption.model.StaticEncryptionMaterialsProvider Maven / Gradle / Ivy

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package com.ksyun.ks3.service.encryption.model;

import java.util.Map;

/**
 * Simple implementation of EncryptionMaterialsProvider that just wraps static
 * EncryptionMaterials.
 */
public class StaticEncryptionMaterialsProvider implements EncryptionMaterialsProvider {
    
    private final EncryptionMaterials materials;

    public StaticEncryptionMaterialsProvider(EncryptionMaterials materials) {
        this.materials = materials;
    }

    public EncryptionMaterials getEncryptionMaterials() {
        return materials;
    }

    public void refresh() {}

    public EncryptionMaterials getEncryptionMaterials(
            final Map materialDescIn) {
        final Map materialDesc =
            materials.getMaterialsDescription();
        if (materialDescIn != null 
        &&  materialDescIn.equals(materialDesc)) {
            return materials;   // matching description
        }
        EncryptionMaterialsAccessor accessor = materials.getAccessor();
        if (accessor != null) {
            EncryptionMaterials accessorMaterials =
                accessor.getEncryptionMaterials(materialDescIn);
            if (accessorMaterials != null)
                return accessorMaterials;   // accessor decided materials
        }
        // The condition that there are
        // 1) no input materials description (typically from S3); and
        // 2) no materials description for the current client-side materials; and
        // 3) the client's material accessor has no corresponding materials
        //    for null or empty materials description;
        // implies that the only sensible materials is
        // the current client-side materials (which has no description).
        boolean noMaterialDescIn = materialDescIn == null || materialDescIn.size() == 0;
        boolean noMaterialDesc = materialDesc == null || materialDesc.size() == 0;
        return noMaterialDescIn && noMaterialDesc ? materials : null;
    }
}